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    Report on diagnosis and treatment of hemophilia in China 2023
    XUE Feng, DAI Jing, CHEN Lixia, LIU Wei, ZHANG Houqiang, WU Runhui, SUN Jing, ZHANG Xinsheng, WU Jingsheng, ZHAO Yongqiang, WANG Xuefeng, YANG Renchi
    Journal of Diagnostics Concepts & Practice    2023, 22 (02): 89-115.   DOI: 10.16150/j.1671-2870.2023.02.001
    Abstract1919)   HTML63)    PDF (1494KB)(1295)      

    In recent years, China attaches great importance to the prevention and treatment of rare diseases. As one of the representative diseases of rare diseases, management of Hemophilia has made great progress in China. From 1986 to 1989, the National Hemophilia Cooperative Group conducted China's hemophilia epidemiological survey according to the unified method and standard, and the results showed that the prevalence of hemophilia was 2.73/100 000, and there was no statistical difference in prevalence among different regions. In 2014, Meta-analysis showed that the prevalence of hemophilia in China was 2.8/100 000, and in 2018, based on the data of the urban population of Tianjin, the local prevalence of hemophilia was estimated to be 3.09/100 000. With the comprehensive promotion of the construction of hemophilia hierarchical diagnosis and treatment system, China requires that hospitals applying for hemophilia comprehensive management centers and diagnosis and treatment centers must be able to independently carry out screening tests and confirmatory tests related to hemophilia diagnosis. For diagnosis of hemophilia, most laboratories in China usually adopt the one-stage method (coagulation method) based on the activated partial thromboplastin time (APTT) for the determination of coagulation factor activity, but it should be noted that more than two activity detection methods are required for some special types of hemophilia. The types of each mutation in the F8 gene of patients in China are similar to those reported in international data, and the mutations in the F9 gene of our patients are mainly single base point mutations, with no mutation hotspots found. As of June 2023, a total of more than 40 000 cases with inherited bleeding disorders registered in 261 centers in China (including hemophilia), through the National Hemophilia Registration System. The history of hemophilia treatment in China has been explored through inadequate on-demand and low-dose prophylaxis, and is now moving towards higher-dose prophylaxis and individualized prophylaxis with higher efficacy. Based on the above registry data and literature, this report comprehensively summarizes the progress of basic and clinical research and medical protection in the field of hemophilia in China, and analyzes the shortcomings for further improvement of hemophilia diagnosis and treatment in China.

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    Stepwise Inertial Intelligent Control of Wind Power for Frequency Regulation Based on Stacked Denoising Autoencoder and Deep Neural Network
    WANG Yalun, ZHOU Tao, CHEN Zhong, WANG Yi, QUAN Hao
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1477-1491.   DOI: 10.16183/j.cnki.jsjtu.2022.157
    Accepted: 10 March 2023

    Abstract1617)   HTML10)    PDF (10551KB)(126)      

    Stepwise inertial control (SIC) provides a step-increase of power after load fluctuation, which can effectively prevent system frequency decline and ensure the safety of grid frequency. However, in the power recovery stage, secondary frequency drop (SFD) is easy to occur. Therefore, it is necessary to optimize SIC to obtain a better frequency regulation effect. The traditional method has the disadvantages of high calculation dimension and long consuming time, which is difficult to meet the requirements of providing the optimal control effect in different scenarios. In order to realize the optimal stepwise inertial fast control of wind power frequency regulation in load disturbance events, this paper introduces the deep learning algorithm and proposes a stepwise inertial intelligent control of wind power for frequency regulation based on stacked denoising autoencoder(SDAE) and deep neural network(DNN). First, sparrow search algorithm (SSA) is used to obtain the optimal parameters, and SDAE is used to extract the data features efficiently. Then, DNN is used to learn the data features, and the accelerated adaptive moment estimation is introduced to optimize the network parameters to improve the global optimal parameters of the network. Finally, the stepwise inertial online control of wind power frequency regulation after disturbance event is realized according to SDAE-DNN. The simulation analysis is conducted for a single wind turbine and a wind farm in the IEEE 30-bus test system. Compared with the results obtained by the traditional method, shallow BP neural network and original DNN network, it is found that the proposed network structure has a better prediction accuracy and generalization ability, and the proposed method can achieve a great effect of stepwise inertia frequency regulation.

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    Optimization Design of New Bionic Propeller
    WU Chunxiao, LU Yu, LIU Shewen, GU Zhuhao, SHAO Siyu, SHAO Wu, LI Chuang
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1421-1431.   DOI: 10.16183/j.cnki.jsjtu.2022.174
    Accepted: 27 October 2022

    Abstract1614)   HTML17)    PDF (10709KB)(239)      

    A novel method for optimal design of hydrodynamic performance of bionic propeller with a deformable leading edge is proposed. Based on the bionics principle and method of parameterized modeling, the fore-fin concave-convex structure of humpback whales is applied to the propeller leading edge, the leading edge in the propeller to meet flow region according to the exponential decay curve and the standard sine curve smooth leading edge for similar humpback fins protuberant structure of concave and convex deformation, and the leading edge of concave and convex bionic propeller. The hydrodynamic performance, the cavitation performance, and the noise performance of the exponential decay bionic propeller and the sinusoidal function bionic propeller were simulated respectively. The propeller with a better performance is selected, and the simulation based design (SBD) technology is introduced into the optimization design of the new bionic propeller. The parameters controlling the shape of the exponential attenuation curve of the guide edge deformation are taken as optimization design variables, the torque of the parent propeller is taken as the constraint condition, the open water efficiency is selected as the objective function, and the optimization algorithm of Sobol and T-Search is adopted. A bionic propeller optimization system based on the exponential decay curve is constructed. The results show that the application of the concave and convex structure of the humpback whale fore-fin to the guide edge of the propeller improves the cavitation performance and noise performance of the propeller, but the improvement of the open water performance of the propeller is not particularly significant. It is verified that the hydrodynamic performance optimization design method of the bionic propeller established in this paper is effective and reliable, which provides a certain theoretical basis and technical guidance for the performance numerical calculation and configuration optimization design of the bionic propeller.

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    Analysis of Fluid-Structure Coupling Energy Transfer Characteristics Slender Structure with Variable Cross-Section at Low Reynolds Number
    DENG Xiubing, YU Yuemin, PANG Xiyuan
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1400-1409.   DOI: 10.16183/j.cnki.jsjtu.2022.133
    Accepted: 17 February 2023

    Abstract1611)   HTML11)    PDF (18587KB)(122)      

    The wavy deformed cross-section cylindrical structure has excellent properties of drag reduction in fluid flow, but the flow-induced vibration characteristics of flexible structure with such variable cross-section are still unclear. In this paper, based on the high-performance spectral element method, a fluid-structure coupled mechanistic model and a numerical algorithm for slender structures are established. The wake characteristics, structural dynamic responses, energy transfers, and spanwise variations of vortex shedding frequencies are discussed. The numerical simulation results show that slender structure with the wavy-deformed cross-section can greatly suppress the vortex-induced vibration response at an appropriate cross-section disturbance wave height, and the special vortex structure formed on both sides of the wavy-shaped slender structure can stabilize the flow around the shear layer and elongate the vortex formation length, thereby reducing the fluid-structure coupling effect between the wake structure and the slender structure, and suppressing the vortex-induced vibration response.

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    Wake Field Characteristics of Non-Ducted and Ducted Propellers in Large-Angle Oblique Flow
    ZHANG Qin, WANG Xinyu, WANG Zhicheng, WANG Tianyuan
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1432-1441.   DOI: 10.16183/j.cnki.jsjtu.2022.159
    Accepted: 09 December 2022

    Abstract1603)   HTML10)    PDF (18498KB)(129)      

    In order to explore the wake characteristics of non-ducted and ducted propellers in oblique inflow with a large drift angle, based on the delayed detached eddy simulation, a numerical simulation of non-ducted and ducted propellers in oblique inflow is conducted with an advance coefficient (J=0.4) and a large drift angle (β=45°, 60°). It is found that the deflection degree of the non-ducted propeller wake is higher than that of the ducted propeller. However, the overall distribution area of the wake vortex behind the ducted propeller is kinked. The wake field in the oblique flow shows its complexity, and the evolution process of vortices on the windward side differs from that on the leeward side. The above characteristic of the non-ducted propeller is more prominent. At the same time, the leading edge of the nozzle on the leeward side will produce local shedding vortices and transmit to the downstream due to flow separation. Part of the kinetic energy of the ducted propeller is converted into the nozzle thrust, which makes the turbulence kinetic energy of the wake lower than that of the non-ducted propeller. This phenomenon is more evident with the increase in the drift angle. Compared with the non-ducted propeller, the ducted propeller can maintain a better handling stability in large-angle oblique flow. This paper analyzes the influence of large-angle oblique inflow on the non-ducted and ducted propellers from the perspective of wake field characteristics and explores the theoretical basis for the ducted propeller to maintain a better handling stability in oblique flow.

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    Optimization of Wind Turbine Vortex Generator Based on Back Propagation Neural Network
    XIA Yunsong, TAN Jianfeng, HAN Shui, GAO Jin’e
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1492-1500.   DOI: 10.16183/j.cnki.jsjtu.2022.169
    Accepted: 28 March 2023

    Abstract1573)   HTML11)    PDF (9995KB)(99)      

    The optimal Latin hypercube experimental design method is used to refine the vortex generator parameters, determine the test scheme, simulate and calculate the thrust and torque of the wind turbine, and obtain the experimental data. Based on the back propagation (BP) neural network, the aerodynamic performance model of the wind turbine vortex generator optimized by genetic algorithm is constructed. The reliability of the aerodynamic performance model is verified by calculating the error and root mean square of the predicted and simulated values of the aerodynamic performance model. Coupling the fish swarm algorithm and the aerodynamic performance model of the wind turbine vortex generator, an optimization method of the wind turbine vortex generator is established, and the height, length, and installation angle of the vortex generator are solved iteratively to realize the optimization of the vortex generator. The results show that compared with the original vortex generator scheme, the flow separation of the wind turbine blade section optimized by the vortex generator is effectively restrained and delayed, the surface fluid separation phenomenon is improved, the power of the wind turbine is increased by 1.711%, and the thrust of the wind turbine is decreased by 0.875%.

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    Experimental Investigation of Dynamic Response of Pile-Supported Wharf in Liquefiable Ground Under Wave Action
    BI Jianwei, SU Lei, XIE Libo, ZHANG Yu, LING Xianzhang
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1442-1454.   DOI: 10.16183/j.cnki.jsjtu.2022.163
    Accepted: 10 November 2022

    Abstract1558)   HTML9)    PDF (8259KB)(176)      

    Pile-supported wharf (PSW) is widely used in the deep-water port engineering construction, most of which are located in liquefiable ground. The effect of wave action on the working performance of PSW in liquefiable ground cannot be ignored, but few studies have been reported. This study performs the wave flume test of PSW in liquefiable ground considering the soil-structure-wave interaction. This test really reproduces the operating condition of PSW, and explores the internal response difference of wharf structure under wave. The influence of wave height on dynamic response of the PSW system is discussed systematically. The result shows that the acceleration and displacement of the PSW deck gradually increase first and finally remain relatively stable with the increase of wave action. The hydrodynamic pressure and deformation of each pile in pile group are obviously different, and the response variation is related to the pile position. The pore pressure of the soil layer in the free field and around the pile decreases with the increase of depth, and the existence of the pile group can reduce the pore pressure in the soil layer around the pile, and increase the acceleration of the soil layer. The effect of wave height on the soil layer decreases with the increase of depth. The above results can provide reference for the similar PSW test under wave and the support for the design and wave protection of PSW.

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    Robust Optimization of Power Grid Investment Decision-Making Considering Regional Development Stage Uncertainties
    HUANG Wandi, ZHANG Shenxi, CHENG Haozhong, CHEN Dan, ZHAI Xiaomeng, WU Shuang
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1455-1464.   DOI: 10.16183/j.cnki.jsjtu.2022.053
    Abstract1538)   HTML13)    PDF (2782KB)(65)      

    Aimed at the problem of uncertainties in the regional development stage and the difficulties in quantifying regional investment demand in different development stages, a robust optimization method for power grid investment decision-making considering regional development stage uncertainties is proposed to promise the matching degree between power grid investment decisions and development needs, and to improve the ability of decision-making results to deal with portfolio risks and uncertainties in regional development stage. First, investment risk constraints are constructed based on the modern portfolio theory. Then, a box uncertainty set is used to characterize uncertainties in regional development stage, and a robust optimization model for power grid investment decision-making considering uncertainties in development stage is established. In the optimization model, the outer minimization problem is used to solve the uncertain variables in regional development stage in the worst scenario, while inner maximization problem is used to obtain the decision-making plan that can maximize investment return in the worst scenario. Furthermore, according to the strong duality theory, the double-layer optimization model is transformed into a single-layer model that can be solved directly, and the big-M method is used to solve the model proposed. Finally, an actual example of 13 cities in an eastern coastal province verifies the applicability and effectiveness of the power grid investment decision-making model.

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    An Improved NLC and Capacitor Voltage Control Method for Medium-/Low-Voltage MMCs
    ZHANG Wei, HAN Junfei, ZHONG Ming, WANG Yuqiang
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1465-1476.   DOI: 10.16183/j.cnki.jsjtu.2022.172
    Accepted: 27 March 2023

    Abstract1436)   HTML12)    PDF (2806KB)(93)      

    The modular multilevel converter (MMC) suffers from low output level and high harmonic distortion in medium-/low-voltage applications such as direct current (DC) distribution networks. In addition, the capacitor voltage of MMC is coupled with DC bus voltage in the traditional modulation method, leading to large fluctuations of capacitor voltages and deviation from the rated value under DC bus voltage margin. In order to solve the problems above, this paper proposes an improved nearest level control method, which can increase the output level of medium-/low-voltage MMCs by introducing a step wave correction. Based on the proposed modulation method, a capacitor voltage feedback control is thus proposed to limit the range of capacitor voltage fluctuations and improve equipment safety. The effectiveness of the proposed method is verified by MATLAB/Simulink simulation and real-time digital simulation system hardware-in-the-loop test.

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    Simulation Study of Reentry Dynamics of a Deep-Water Drilling Riser System Based on Model Predictive Control
    ZHANG Chenyu, MENG Shuai
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1389-1399.   DOI: 10.16183/j.cnki.jsjtu.2022.235
    Accepted: 09 December 2022

    Abstract1321)   HTML25)    PDF (2622KB)(178)      

    A marine drilling riser at normal operation condition is required to disconnect the lower marine riser package (LMRP) and blow-out preventer (BOP) in case of severe weather. When the weather gets fine, it must reconnect the LMRP and the BOP. This process is called riser reentry. Marine drilling operations have been driven into extreme deep-waters characterized by severe weather which inevitably leads to a much higher incidence of disconnection. In addition, it requires to accomplish the reentry in a fast way owing to the capricious ocean environment. This study tries to develop a novel reentry control system based on model predictive control (MPC). First, the transverse governing equation of the hanging-off riser system with an end-mass is established based on the modified Hamilton’s principle. The optimization function and constraints in MPC are designed by use of the riser prediction model and the target location. A nonlinear disturbance observer is established for compensation of the model uncertainties and ocean environment disturbances. Finally, simulations are conducted after introducing the dynamic position system (DPS). The riser dynamics employing MPC are compared with that when adopting proportional-integral-derivative (PID) controller. It has found that the drilling riser system based on MPC has a higher response speed, which can complete the reentry process in a faster and more stable manner. It can handle the hydrodynamic force model uncertainties well and has a good robustness for current velocity disturbances. As the flexibility of the riser system is notably enhanced with the significant increase of aspect ratio, the higher-order mode of the flexible hanging-off riser can be triggered in the fast reentry process subjected to the excitations of the mother vessel and ocean environment.

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    Multi-Objective Optimization of Electric Vehicle Spare Capacity Based on User Wishes
    SHAO Ping, YANG Zhile, LI Kang, ZHU Xiaodong
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1501-1511.   DOI: 10.16183/j.cnki.jsjtu.2022.131
    Accepted: 05 July 2023

    Abstract902)   HTML8)    PDF (5565KB)(98)      

    Due to the considerable number and the characteristics of energy storage, it is possible for electric vehicles (EVs) to participate in the operation and regulation of power system to provide reserve service. In view of this, a multi-objective optimal scheduling model is established based on the wishes of electric vehicle users, with the objectives of the economic benefits of electricity collectors, microgrid power fluctuations and user satisfaction. Considering the uncertainty of load demand, the optimal scheduling analysis of multi-time scale scenes with the day-ahead time scale and the intra-day real-time correction time scale is conducted. The mainstream multi-objective intelligent optimization algorithm NSGA-III algorithm is adopted in the solution method, and the NSGA-II and MOEA/D algorithms are used for comparison. The optimal dispatching scheme is selected through comparative experiments and scenarios where EVs provide spare capacity are analyzed. The simulation results verify the feasibility and effectiveness of the proposed model.

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    Interpretation on the report of global stroke data 2022
    TANG Chunhua, GUO Lu, LI Qiong, ZHANG Lili
    Journal of Diagnostics Concepts & Practice    2023, 22 (03): 238-246.   DOI: 10.16150/j.1671-2870.2023.03.06
    Abstract882)   HTML61)    PDF (2270KB)(760)      

    In 2022, the World Stroke Organization released two new reports regarding global stroke statistics in the International Journal of Stroke. The reports updated the global incidence and mortality of stroke, evaluated the effects of gender and geographic factors, and provided updated statistics on attributable risk factors associated with stroke. This article briefly interprets the two reports in the context of stroke prevalence and disease burden in China. 2019 Global Burden of Disease Study findings show that stroke remains the second-leading cause of death and the third-leading cause of death and disability combined in the world. From 1990 to 2019, the burden (in terms of the absolute number of cases) increased substantially, with the bulk of the global stroke burden residing in lower-income and lower-middle-income countries. Moreover, people under 70-year-old were observed to have significant increases in stroke prevalence and incidence. The five major risks for stroke globally include high systolic blood pressure, high body mass index, high fasting glucose, environmental particulate matter pollution, and smoking. Stroke prevention and treatment in China are facing great challenges. Stroke has become the leading cause of death and disability among Chinese adults, as well as the leading cause of disability adjusted life year lost. The incidence, prevalence and mortality of stroke in China are geographically high in the north, low in the south and prominent in the central part of the country; the prevalence is higher in rural areas than that in urban areas; the morbidity and mortality rates are higher in men than those in women; the average age of onset is lower than in developed countries; the overall disease burden of ischemic stroke is on the rise, but that of hemorrhagic stroke is on the decline. The awareness of stroke prevention and treatment was low. In conclusion, it is of strategic importance to actively establish a graded stroke prevention and control system that meets the national conditions.

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    Chinese interpretation of Japanese Gastric Cancer Treatment Guidelines 2021 (6th edition) and Ruijin clinical practice
    YAN Chao, LU Sheng, YAN Min, ZHU Zhenggang
    Journal of Surgery Concepts & Practice    2023, 28 (04): 326-354.   DOI: 10.16139/j.1007-9610.2023.04.010
    Abstract840)   HTML10)    PDF (4954KB)(1110)      

    “Japanese Gastric Cancer Treatment Guidelines” have been important guidelines for the treatment of gastric cancer in Japan and worldwide. The English version “Japanese Gastric Cancer Treatment Guidelines 2021 (6th Edition)” published in January 2023 consists of two parts. The first part includes diagnostic and treatment methods, such as surgery, endoscopic resection, chemotherapy, follow-up. The second part addresses clinical issues, including recommendations and explanations for clinical hot topics. This article will provide a Chinese interpretation of the guidelines and briefly introduce our hospital's clinical practice in the diagnosis and treatment of gastric cancer.

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    Dynamic Characteristics of Two-Dimensional Structures Slamming Under Free Fall Condition
    SUN Zhe, SUI Xupeng, KOROBKIN Alexander, DENG Yanzeng, ZHANG Guiyong, ZONG Zhi, JIANG Yichen
    Journal of Shanghai Jiao Tong University    2023, 57 (11): 1410-1420.   DOI: 10.16183/j.cnki.jsjtu.2022.189
    Accepted: 21 March 2023

    Abstract833)   HTML11)    PDF (1402KB)(149)      

    The slamming process of two-dimensional structures under free fall condition with arbitrary symmetrical shapes is investigated by combining various analytical models for slamming and the precise integration method in the time domain. By closely analyzing the mathematical expression of analytical models, the total slamming force acting on the body can be decomposed into two terms which are dependent on the velocity and the acceleration respectively. The developed model proposed in this paper is validated against the results from experiments and other numerical methods. Moreover, it is found that if the gravity of body is ignored, which is a reasonable assumption for situations such as structures with light weight or large entry velocity, the maximum acceleration (or the peak slamming force) for a free fall body will always occur at the certain penetration depth for a particular shape and mass, regardless of the initial slamming velocity.

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    A Microgrid Energy Management Strategy Considering Carbon Quota Guided Demand Response
    JIANG Enyu, CHEN Yu, SHI Zhengjing, WU Zhecheng, LIN Shunfu, LI Dongdong
    Journal of Shanghai Jiao Tong University    2023, 57 (9): 1126-1136.   DOI: 10.16183/j.cnki.jsjtu.2022.378
    Accepted: 23 May 2023

    Abstract725)   HTML15)    PDF (2823KB)(97)      

    In order to reduce the forecast output error caused by the randomness and volatility of renewable energy in microgrid operation, a microgrid energy management strategy considering carbon quota guided demand response is proposed. A two-layer model predictive control (MPC) energy management model is constructed. The upper layer guides electric vehicles to participate in the demand response of microgrid by constructing a carbon emission quota mechanism to realize the economic operation of microgrid and reduce carbon emissions. The lower layer uses the model predictive control rolling optimization and the power fluctuation caused by the prediction error of renewable energy is suppressed by the short time scale model predictive control. The results of calculation analysis show that the proposed energy management strategy can effectively guide electric vehicles or other controllable loads to participate in demand response and realize low-carbon economic dispatch and stable operation of microgrid.

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    Resilience Evaluation and Enhancement Strategy of Distribution Network Considering Impact of Seismic Attack on Transportation Networks
    YAN Wenting, YANG Long, LI Changcheng, LUO Wei
    Journal of Shanghai Jiao Tong University    2023, 57 (9): 1165-1175.   DOI: 10.16183/j.cnki.jsjtu.2022.152
    Accepted: 14 February 2023

    Abstract724)   HTML14)    PDF (2248KB)(202)      

    Serious earthquake disasters not only cause power outages in distribution network, but also destroy transportation networks, which hinders the transportation of resources for restoration of distribution network and slows down the restoration. This paper proposes an improved resilience evaluation method and a resilience enhancement strategy of distribution network considering the effects of seismic attack on transportation networks. First, a seismic attack model is established to describe the relation between earthquake disasters and failure probability of transportation-distribution networks based on peak ground acceleration. The impact of earthquake disasters on transportation-distribution networks is quantified, and the failure scenarios are generated. Then, a resilience evaluation index is proposed by introducing the waiting time for road repair of emergency repair teams. Afterwards, a bi-level optimization model for distribution network restoration considering the fault line repair, the road repair, and the emergency resource scheduling is established and solved. The upper layer aims at the minimum power loss load, while the lower layer takes the minimum waiting time of the repair team as the goal. Finally, case studies on a coupling example of a 12-node transportation network and an IEEE 33-node distribution network verify the feasibility of the improved resilience index and the effectiveness of the proposed method. The results show that the resilience index considering seismic attack on transportation networks is accurate, and the restoration strategy can effectively enhance the resilience of distribution network in earthquake disasters.

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    A Two-Stage Distributionally Robust Economic Dispatch Model Under the Coordination of Inter-Provincial and Intra-Provincial Bi-Level Market
    CHEN Yi, WANG Han, XU Xiaoyuan, HU Youlin, YAN Zheng, ZENG Dan, FENG Kai
    Journal of Shanghai Jiao Tong University    2023, 57 (9): 1114-1125.   DOI: 10.16183/j.cnki.jsjtu.2022.121
    Abstract682)   HTML18)    PDF (2373KB)(80)      

    To promote the optimal allocation of resources across the country, China is actively developing inter-provincial electricity transactions, and will gradually form an inter-provincial and intra-provincial electricity market operation mode. In this context, a two-stage day-ahead, and intraday economic dispatch framework considering inter-provincial and intra-provincial bi-level market coordinated operation is proposed. In the day-ahead dispatch stage, an inter-provincial and intra-provincial bi-level economic dispatch model is constructed. In the intraday dispatch stage, an economic dispatch model considering the forecast error of source-load is constructed. To further deal with the influence of the uncertainty of source-load forecast on economic dispatch, a two-stage day-ahead and intraday distributionally robust economic dispatch model and its solution method are proposed, realizing the economic dispatch under random scene ambiguity set. Finally, a multi-sending ends and multi-receiving ends interconnected test system is constructed using IEEE 39-bus and 118-bus systems. The effectiveness of the proposed model and method is verified by simulation.

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    Two-Stage Optimal Configuration of Microgrid Based on Fuzzy Scene Clustering
    MI Yang, LI Haipeng, CHEN Boyang, PENG Jianwei, WEI Wei, YAO Yan
    Journal of Shanghai Jiao Tong University    2023, 57 (9): 1137-1145.   DOI: 10.16183/j.cnki.jsjtu.2022.090
    Accepted: 21 April 2023

    Abstract664)   HTML10)    PDF (7524KB)(100)      

    Aimed at the impact of extreme weather on the stable operation of microgrid, an optimal configuration strategy of microgrid based on fuzzy scene clustering is proposed. Using historical weather data, a fuzzy scene clustering method is used to deal with the problem of new energy output fluctuations caused by random weather on the source side, and a robust optimization model is established on the load side to deal with load fluctuations within a certain range. Using scenes of 8 760 hours in a year, typical scenes and extreme scenes are obtained by distinguishing the unique membership characteristics of fuzzy scene clusters. Considering the impact of extreme scenarios on the optimal configuration of the microgrid, a two-stage robust model with the smallest comprehensive cost is established, which is decomposed by the column and constraint method, and is finally solved iteratively by Cplex solver. The effectiveness and feasibility of the proposed optimal configuration strategy are verified by simulation analysis.

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    An Adaptive Additional Control Strategy for Suppressing Low-Frequency Grid Oscillations in Doubly-Fed Wind Farms
    LIU Xinyu, WANG Sen, ZENG Long, YUAN Shaoheng, HAO Zhenghang, LU Xinyan
    Journal of Shanghai Jiao Tong University    2023, 57 (9): 1156-1164.   DOI: 10.16183/j.cnki.jsjtu.2022.135
    Accepted: 26 April 2023

    Abstract660)   HTML9)    PDF (4403KB)(126)      

    Aiming at the problem of weakly or negatively damped low-frequency oscillations caused by cross-zone transmission of electricity from large wind farms, this paper proposes a fast terminal sliding-mode additional damping controller based on the Lyapunov stability theory. By investigating the flexible power regulation characteristics and the capability of dynamic frequency response to damping regulation of doubly-fed wind turbines (DFIG), a rotor magnetic chain controller is designed according to the relationship between the applied voltage and magnetic chain of DFIG rotor and the sliding mode variable structure control method. When low-frequency oscillations occur in the system, the desired magnetic chain value will deviate from the actual magnetic chain value. The additional damping controller outputs an adaptive control signal for the rotor-side power control link to increase the active output of the wind farm and suppress low-frequency oscillations in the system. A simulation model of the wind power grid-connected system is established in MATLAB/Simulink for off-line simulations, and a real-time simulation experiment of a large wind farm cross-zone transmission model based on real time digital simulation system is conducted. The results of both off-line and real-time simulations show that when low-frequency oscillations occur in the system, the proposed control method can quickly regulate the active power emitted by the DFIG and enhance the damping level of the system, which is effective in suppressing low-frequency oscillations in the system.

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    Interpretation of Multiple Myeloma Guidelines update (version 2, 2023) of National Comprehensive Cancer Network (NCCN)
    TAO Yi, MI Jianqing
    Journal of Diagnostics Concepts & Practice    2023, 22 (02): 121-126.   DOI: 10.16150/j.1671-2870.2023.02.003
    Abstract638)   HTML38)    PDF (1042KB)(1376)      

    Multiple myeloma (MM) is the second most common hematological malignancy. With the continuous advent of new drugs, the survival of MM patients has been significantly improved, with a median survival of 7-10 years. However, the overall survival of high-risk MM patients is still less than 3 years, and extending the survival of high-risk MM has always been a hot topic in this field. The National Comprehensive Cancer Network (NCCN) released the 2nd version of the MM guidelines for 2023 (2023. v2). Compared with the 5th edition of the MM guidelines for 2022, the update of this guideline in diagnosis is mainly reflected in the detailed description of high-risk MM in tabular form, including both cytogenetic high-risk factors containing 1q21 gain/amplification and clinical high-risk factors, such as extramedullary disease, renal failure and weakness. In terms of treatment, the updated guideline still emphasizes the importance of autologous hematopoietic stem cell transplantation in the era of new drugs, and indicates that the judgment of whether patients are suitable for transplantation needs to be dynamically adjusted based on the patients’ condition after initial treatment. 2023. v2 upgrades the recommendation of the new generation proteasome inhibitor carfilzomib in initial induction and CD38 monoclonal antibody in maintenance therapy. The combinations of these new drugs with immunomodulatory drug pomalidomide are also listed as the preferred regimens in relapsed patients. The diagnostic techniques for distinguishing high-risk MM and new drugs recommended in the updated guideline are currently available in China, Which greatly enhanc our confidence in the “clinical cure” of MM. A comprehensive interpretation of the 2023. v2 of the guidelines is expected to improve the diagnostic and therapeutic level of clinicians, and further improve the prognosis of China’s MM patient population, especially high-risk patients.

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    Efficacy of intraoperative indocyanine green fluorescence imaging evaluation for preventing anastomotic leakage after laparoscopic rectal cancer surgery
    LUO Yang, YU Minhao, YE Guangyao, LIN Haiping, GONG Tingyue, LI Hao, ZHONG Ming
    Journal of Surgery Concepts & Practice    2023, 28 (03): 249-253.   DOI: 10.16139/j.1007-9610.2023.03.012
    Abstract600)   HTML3)    PDF (3438KB)(76)      

    Objective To investigate the effect of indocyanine green(ICG) fluorescence imaging to indicate blood supply of sigmoid-rectal anastomosis in laparoscopic anterior resection of rectal cancer. Methods Here a retrospective cohort study including 175 consecutive patients with rectal cancer scheduled for laparoscopic surgery in Department of Gastrointestinal Surgery of Renji Hospital between January 2019 and December 2022 was analysed. These patients were classified into two groups, according to using ICG or not within surgery: the ICG group (n=65) and the control group (n=110). Operation situations and complications were compared between the two groups. Results The operation time of ICG group was longer than that of control group [(151.6±4.8) min vs (139.5±3.7) min, P=0.04], and the preventive ileostomy rate was lower than that of control group (12.3% vs 34.6%, P=0.01), while the other operation data (intraoperative blood loss, number of lymph node dissection), were similar between the two groups (P>0.05). The rate of anastomotic leakage in ICG group were lower than that in control group (4.6% vs 14.6%, P=0.04), and there was no significant differences in wound infection, urinary retention and intestinal obstruction between the two groups (P>0.05). Conclusions The ICG displays that the blood supply in laparoscopic anterior resection of rectal cancer can reduce the incidence of anastomotic leakage, which improves the surgical safety and the quality of postoperative life.

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    Cost Sharing Mechanisms of Pumped Storage Stations in the New-Type Power System: Review and Prospect
    LIU Fei, CHE Yanying, TIAN Xu, XU Decao, ZHOU Huijie, LI Zhiyi
    Journal of Shanghai Jiao Tong University    2023, 57 (7): 757-768.   DOI: 10.16183/j.cnki.jsjtu.2021.516
    Accepted: 14 February 2023

    Abstract589)   HTML44)    PDF (2464KB)(417)      

    Driven by the carbon peaking and carbon neutrality goals, the power system is transforming to the new structure which is dominated by renewable energy and is facing a new supply-demand balance situation. Pumped storage, as the most mature energy storage technology at present, can provide flexible resources with different time scales to ensure the safety of the power system and promote the consumption of renewable energy. However, the operation strategy and cost sharing mechanism of the pumped storage station (PSS) are not clear, which hinders its further development under the new situation. In this context, the technical characteristics and functions of PSS are sorted out first. Then, the investment cost model is established from the perspective of the whole life cycle. After that, the evolution path of pricing mechanism and cost sharing mode are described in view of the different stages of electricity market development, providing a feasible scheme for the marketization of PSS. Finally, the future development of PSS is summarized and prospected.

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    Expert consensus on diagnosing and evaluating sacroiliitis using magnetic resonance imaging
    DAI Shengming, BAO Chunde, ZOU Hejian, et al
    Journal of Internal Medicine Concepts & Practice    2023, 18 (02): 65-69.   DOI: 10.16138/j.1673-6087.2023.02.001
    Abstract586)   HTML14)    PDF (756KB)(264)      
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    Value of serum N-terminal pro-brain natriuretic peptide levels in primary screening peritoneal dialysis patients with volume overload
    LI Hua, HUANG Xiaomin, ZHANG Chunyan, DU Lu, REN Hong, XU Tian
    Journal of Internal Medicine Concepts & Practice    2023, 18 (03): 157-164.   DOI: 10.16138/j.1673-6087.2023.03.005
    Abstract525)   HTML1)    PDF (845KB)(63)      

    Objective To explore the relationship between serum N-terminal pro-brain natriuretic peptide (NT-proBNP) level and hydration status and cardiac function indexes in the patients receiving peritoneal dialysis(PD) treatment,and to further analyze the factors affecting the level of NT-proBNP. Methods A total of 111 patients with PD who were followed up in the PD Center of Ruijin Hospital, Shanghai Jiao Tong University School of Medicine from May 2019 to January 2022 were enrolled and the data was analyzed retrospectively. According to the results of multi-frequency bioelectrical impedance body composition monitor (BCM), relative hydration status (DHS), the ratio obtained through dividing extracellular water (ECW) by overhydration (OH), the patients were divided into normal volume group (OH/ECW≤15%) and overhydration group (OH/ECW>15%). The relationship between serum NT-proBNP level and hydration status in two groups was compared, and the related factors affecting the level of NT-proBNP were further analyzed and discussed. Using BCM result as the“gold standard”, the receiver operator characteristic curve(ROC curve) determined the optimal threshold of NT-proBNP as the capacity was overloaded. The patients were divided into two groups according to NT-proBNP and their clinical data were compared. Results The indexes including systolic blood pressure, urine volume, urea clearance index (Kt/V), creatinine clearance rate(CCr), dialysate to plasma ratio for urea at 4 hours(4hD/PCr), types of antihypertensive drugs, type of diuretic, hemoglobin, serum albumin, log2(NT-proBNP), interventricular septal thickness (IVST), left ventricular posterior wall thickness(LVPWT), left atrial diameter(LAD), OH, TBW, ECW, OH/TBW, ECW/TBW and ECW/ICW were detected in volume overload group and normal volume group, and showed statistically significant (all P<0.05). log2(NT-proBNP) level was correlated with systolic blood pressure, dialysis duration, ultrafiltration volume, dialysis dose, antihypertensive drug group, IVST, LVPWT, LAD, left ventricular end-systolic dimension (LVESD), left ventricular end-diastolic dimension (LVEDD), OH, OH/ECW were positively correlated (all P<0.05). It was negatively correlated with urine volume, Kt/V, CCr, normalized protein catabolic rate (nPCR), hemoglobin, serum albumin and LVEF (all P<0.05). NT-proBNP 4 896 ng/L could be used as the critical value of initial screening capacity overload and was applied to divide the patients into two groups, and the systolic blood pressure, urine volume, ultrafiltration volume, Kt/V, CCr, IVST, LVPWT, OH/ECW indicators showed significant differences (all P<0.05) in two groups. Conclusions The level of NT-proBNP in PD patients is generally increased, and it indicates volume overload as its value is greater than 4 896 ng/L, which can be used as a simple monitoring index for the preliminary judgment of volume overload in PD patients.

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    The fifth edition of WHO classification of digestive system tumors: update and progress on biliary system tumors
    LUO Fangxiu, MA Qianchen, YUAN Fei
    Journal of Surgery Concepts & Practice    2023, 28 (02): 124-131.   DOI: 10.16139/j.1007-9610.2023.02.08
    Abstract506)   HTML17)    PDF (3365KB)(1054)      

    Overall, there was little change in biliary system tumors of the 5th edition of WHO classification of digestive system tumors after update. The three-tiered classification of biliary intraepithelial neoplasia changed to two-tiered system: high-grade and low-grade, in the section of benign tumors and precancerous lesions. And both intracholecystic and intraductal papillary tumors associated with invasive carcinoma were added. The classification of intrahepatic bile duct tumors introduced parts of bile duct adenoma and bile duct adenofibroma, which were mentioned previously in the differential diagnosis with bile duct carcinoma. Intrahepatic cholangiocarcinoma was divided into small bile duct subtype and large bile duct subtype in the 5th edition of WHO classification, and the names of cholangiocellular carcinoma and cholangiole cell carcinoma were no longer recommended to use. Extrahepatic cholangiocarcinoma was listed as a separate part for the first time, including squamous cell carcinoma, adenosquamous carcinoma and undifferentiated carcinoma in addition to common histological types. Some new contents of molecular pathology in the 5th edition of WHO classification were added, which provided the basis for precise classification and diagnosis of tumors in biliary system.

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    UConvTrans:A Dual-Flow Cardiac Image Segmentation Network by Global and Local Information Integration
    LI Qing, HUANGFU Yubin, LI Jiangyun, YANG Zhifang, CHEN Peng, WANG Zihan
    Journal of Shanghai Jiao Tong University    2023, 57 (5): 570-581.   DOI: 10.16183/j.cnki.jsjtu.2022.088
    Accepted: 16 September 2022

    Abstract500)   HTML31)    PDF (9362KB)(446)      

    Cardiac magnetic resonance image (MRI) segmentation has the features such as there is a lot of noise, the target areas are indistinguishable from the background, and the shape of the right ventricle is irregular. Although convolution operations are good at extracting local features, the U-shaped convolutional neural networks (CNN) structure hardly models long-distance dependency between pixels and can not achieve ideal segmentation results on cardiac MRI. To solve these problems, UConvTrans is proposed with a dual-flow U-shaped network by global and local information integration. First, the network applies the CNN branch to extract local features and capture global representations by Transformer branch, which retains local detailed features and suppresses the interference of noise and background features in cardiac MRI. Next, the bidirectional fusion module is proposed to fuse the features extracted by CNN and the Transformer with each other, enhancing the feature expression capability and improving the segmentation accuracy of the right ventricle. Besides, the parameters of network can be set flexibly because the transformer structure in the proposed method does not require pre-trained weights. The proposed method also strikes a better balance between precision and efficiency, which is evaluated on the MICCAI 2017 ACDC dataset. The results show that the network outperforms U-Net by 1.13% average dice coefficient while the parameter amount and the floating point operations are only 10% and 8% of the U-Net. Finally, the proposed method achieves a dice coefficient of 92.42% for the right ventricle, 91.64% for the myocardium, and 95.06% for the left ventricle respectively and wins the first place in the myocardium and left ventricle on test set.

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    Robot Skill Learning Based on Dynamic Motion Primitives and Adaptive Control
    ZHANG Wenan, GAO Weizhan, LIU Andong
    Journal of Shanghai Jiao Tong University    2023, 57 (3): 354-365.   DOI: 10.16183/j.cnki.jsjtu.2021.379
    Accepted: 07 December 2022

    Abstract468)   HTML175)    PDF (12357KB)(365)      

    A novel robot skill learning method using dynamic movement primitive (DMP) and adaptive control is proposed. The existing DMP method learns actions from a single teaching trajectory, and its Gaussian basis function distribution mode is fixed, which is not suitable for multiple movement trajectories with different characteristics. Therefore, the Gaussian mixture model (GMM) and Gaussian mixture regression are introduced into DMP to enable the robot to learn skills from multi-teaching trajectory. Moreover, radial basis function neural network (RBFNN) is introduced into DMP to establish the RBF-DMP method, which is able to learn the central position and weight of Gaussian basis through gradient descent and improves the accuracy of skill modeling. Furthermore, an adaptive neural network controller is designed to control the learned actions of the manipulator in redemonstration. Finally, experiments on Franka Emika Panda manipulator prove the effectiveness of the proposed method.

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    Multi-Physics Field Coupling Simulation of Induction Leveling Process
    LIU Xuyang, CAI Changru, ZHAO Yixi, JU Liyang
    Journal of Shanghai Jiao Tong University    2023, 57 (3): 253-263.   DOI: 10.16183/j.cnki.jsjtu.2021.312
    Accepted: 11 January 2022

    Abstract463)   HTML4267)    PDF (9849KB)(384)      

    The electromagnetic induction leveling method has the characteristics of high efficiency and easy operation. It has a good application prospect in the thin plate leveling process. Based on the fixed inline coil induction leveling process used by the shipyard, this research uses COMSOL Multiphysics to establish a three-dimensional electromagnetic-thermal-mechanical coupling induction leveling finite element model. The model inputs the temperature-dependent physical properties as the material properties of the AH36 steel plate, and takes the residual stress and welding deformation of the butt weldment as the initial state. The method of sequential coupling is used to calculate the changes of electromagnetic field, temperature field, and structure field during the leveling process. The two-way coupling relationship between the temperature field and the electromagnetic field is verified and the deformation of the welded part after leveling is obtained. Through the self-built induction leveling experiment platform, the accuracy and effectiveness of the finite element model are verified.

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    An update on complement targeted treatment of IgA nephropathy
    ZHANG Huijian, LI Guisen
    Journal of Internal Medicine Concepts & Practice    2023, 18 (03): 197-200.   DOI: 10.16138/j.1673-6087.2023.03.013
    Abstract461)   HTML10)    PDF (481KB)(205)      
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    Interpretation of Chinese expert consensus on understanding and management of renal anemia in diabetic kidney disease
    WANG Weiming
    Journal of Internal Medicine Concepts & Practice    2023, 18 (03): 137-140.   DOI: 10.16138/j.1673-6087.2023.03.001
    Abstract458)   HTML20)    PDF (420KB)(146)      
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    Controversy over the medial border of lymph node dissection during CME/D3 surgery of right colon cancer
    SUN Yueming, ZHANG Dongsheng
    Journal of Surgery Concepts & Practice    2023, 28 (03): 202-207.   DOI: 10.16139/j.1007-9610.2023.03.005
    Abstract447)   HTML4)    PDF (929KB)(166)      

    Radical surgery is the most important treatment for colon cancer. The development and application of complete mesentery excision (CME)/D3 lymph node dissection has promoted the standardization of surgical techniques for colon cancer. Right colon cancer surgery is relatively complicated, and is a research hotspot currently. The issues involved the range of lymph node dissection, the range of bowel resection, and the method of bowel reconstruction. The medial border of lymph node dissection for right colon cancer is one of the controversies. The left side of the superior mesenteric vein is generally considered to be the medial border of CME/D3 dissection in right colon cancer surgery. However, with the in-depth development of related research, some scholars believed that the left side of the superior mesenteric artery should be used as the medial border for lymph node dissection. This approach is more consistent with the principle of CME, and can achieve complete lymph node dissection. However, its clinical significance still needs to be evaluated with further research. This article discusses the selection of medial border of lymph node dissection for right colon cancer, hoping to provide reference for clinical practice.

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    Contrast study on efficacy of ultrasound-guided transversus abdominis plane block combined with rectus sheath block in peritoneal dialysis catheterization
    WANG Chaojun, YU Ling, WANG Hengjie, REN Hong, SHI Manman, ZHENG Hong, MA Yuhua, XU Tian
    Journal of Internal Medicine Concepts & Practice    2023, 18 (03): 152-156.   DOI: 10.16138/j.1673-6087.2023.03.004
    Abstract441)   HTML3)    PDF (654KB)(39)      

    Objective To compare the effects of ultrasound-guided transversus abdominis plane block(TAPB) combined with rectus sheath block(RSB), TAPB and local infiltration anesthesia in peritoneal dialysis catheterization,and to explore and promote the ideal anesthesia method for peritoneal dialysis catheterization. Methods A total of 46 patients who underwent peritoneal dialysis catheterization in our hospital from May 2016 to June 2021 were enrolled and randomly divided into three groups according to the random number method: ultrasound-guided TAPB combined with RSB (group A),ultrasound-guided TAPB (group B) and local infiltration anesthesia group (group C). The mean arterial pressure (MAP), heart rate, visual analogue scale (VAS) score at different time points during the operation [anesthesia (T0), skin incision (T1), separation of rectus abdominis (T2), establishment of subcutaneous tunnel (T3), and skin suture (T4)], overall operation duration, number of additional anesthetics, number of intraoperative and postoperative adverse reactions and postoperative complications were compared and analyzed among three groups. Results There was no statistically significant difference in MAP and heart rate (all P>0.05) in group A and group B, while both MAP and heart rate in group C showed significant difference (P<0.05) during the operation time (T0, T1, T2, T3 and T4). Compared with group A, additional anesthetics during operation in group B and group C was more frequently used (P<0.05). Compared with group A, the VAS scores of group B at T2, and the VAS scores of group C at T1, T2, T3 and T4 were significantly higher (P<0.05). The operation time of group A was significantly shorter than that of group B and group C (P<0.05). The postoperative complications in group A were significantly less than those in group B and group C (P<0.05). Conclusions Compared with ultrasound-guided TAPB and local infiltration anesthesia, the ultrasound-guided TAPB combined with RSB is a relatively ideal anesthesia method for peritoneal dialysis catheterization, which shows the advantages of safe anesthesia, stable hemodynamics, better comfort and fewer postoperative complications.

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    Factors related to intestine have a role in prevention and treatment for gallstone disease
    JIANG Zhaoyan, SHEN Weiyi, HU Hai
    Journal of Surgery Concepts & Practice    2023, 28 (02): 91-93.   DOI: 10.16139/j.1007-9610.2023.02.01
    Abstract428)   HTML9)    PDF (764KB)(109)      

    Gallstone is a common surgical disease. The factors which related to intestine during the process of gallstone formation have attracted increasing attention. The main factors affecting the formation of cholesterol gallstone including cholesterol absorption, bile acid concentration, gut microbiota changing, are all related to the intestine. A correct understanding of the factors related to intestine during gallstone formation is helpful for the prevention and treatment of gallstone disease. In future, different targets related to intestine may play an important role in both prevention of gallstone disease and post-cholecystectomy management.

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    Classification and surgical treatment of congential biliary dilatation
    WANG Jin, WU Shuodong
    Journal of Surgery Concepts & Practice    2023, 28 (02): 166-170.   DOI: 10.16139/j.1007-9610.2023.02.15
    Abstract428)   HTML3)    PDF (1044KB)(151)      

    Congential biliary dilitation (CBD) is rare biliary tract disease in clinic. Clinical classification and disease characteristics of CBD is the key of accurate treatment. Surgical treatment was regarded as the first choice for adult patients with CBD including traditional surgery. There is still a controversy in the strategy of reconstruction of bile duct during operation. In this article the progress in diagnosis and treatment of CBD was reviewed.

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    Efficacy with prognostic value of postoperative prophylactic hyperthermic intraperitoneal chemotherapy for locally advanced gastric cancer
    SUN Qi, HUANG Wenbo, HE Bingliang, LIU Chang, XU Yuhang, ZHAO Wei
    Journal of Surgery Concepts & Practice    2023, 28 (04): 366-370.   DOI: 10.16139/j.1007-9610.2023.04.013
    Abstract424)   HTML0)    PDF (889KB)(30)      

    Objective To explore the efficacy with prognostic value of postoperative prophylactic hyperthermic intraperitoneal chemotherapy (HIPEC) for locally advanced gastric cancer with clinical stage cT3-4NxM0. Methods A retrospective collection and analysis of clinical data was conducted from 60 patients with locally advanced gastric cancer (cT3-4NxM0) who underwent D2 radical surgery between January 2016 and December 2021 at our department. Patients who underwent prophylactic HIPEC were classified into the HIPEC group (n=30), while patients who did not undergo prophylactic HIPEC were clssified into the control group (n=30). Both groups of patients routinely were treated with postoperative adjuvant systemic chemotherapy. The median survival time, and overall survival rate of the two groups were compared through follow-up, and the risk factors affecting the overall survival rate were analyzed. Results The median survival time of the HIPEC group was 51.0 months (95% CI: 40.7-61.3), which was higher than that of the control group with 30.0 months (95% CI: 16.3-43.7). The 3-year and 5-year overall survival rates of the HIPEC group (66.7%, 53.3%)were higher than those of the control group(56.7%, 43.3%) (P=0.019). Prophylactic HIPEC was the protective factor affecting the overall survival rate of postoperative patients with locally advanced gastric cancer (P=0.021). Conclusions For patients with locally advanced cT3-4NxM0 gastric cancer, prophylactic HIPEC plays an important role in prolonging the median survival time, hence impro-ving the overall survival rate of patients.

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    Design and Preparation Method of Capacitive Lithium-Titanate Battery
    WU Yuhang, LI Canbing, LI Xinxi, GU Huijun, GU Shanhua, ZHENG Xiaogeng
    Journal of Shanghai Jiao Tong University    2023, 57 (4): 473-481.   DOI: 10.16183/j.cnki.jsjtu.2021.509
    Accepted: 06 January 2023

    Abstract415)   HTML41)    PDF (4934KB)(196)      

    In order to solve the problem of battery bulging and capacity fading, this paper proposes an innovative battery capacitor structure and the related preparation process. This method integrates the physical energy storage method of the capacitor and the chemical energy storage method of the energy storage battery. In the preparation process, a novel technology of columnar lithium-ion battery soaking is adopted, which improves the soaking efficiency and reduces the internal moisture of the battery. The related performance tests show that the capacity retention rate of the new lithium-titanate battery can reach 92.5% after 9 548 cycles, and the battery capacity can be maintained above 75% at a low temperature. The proposed method provides an effective means for improving the performance of the lithium-titanate battery.

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    Vascular reconstruction in radical resection for hilar cholangiocarcinoma
    LI Xiangcheng, CHEN Yananlan, LI Changxian
    Journal of Surgery Concepts & Practice    2023, 28 (02): 104-109.   DOI: 10.16139/j.1007-9610.2023.02.04
    Abstract412)   HTML3)    PDF (857KB)(73)      

    Radical resection is the only option of curative treatment for hilar cholangiocarcinoma. Microscopically negative resection margin of bile duct (R0 resection) is critical for long-term survival of patients. However, both portal vein and hepatic artery invasions from hilar cholangiocarcinoma were often found, the negative resection margin could not be gotten. Combined vascular resection and reconstruction provide a possible way to solve this problem. At present, the clinical value of resection of portal vein and hepatic artery combining with reconstruction has been fully recognized. The technique of reconstruction for both portal vein and hepatic artery combined with the clinical significance, preoperative evaluation of imaging and postoperative complications for hilar cholangiocarcinoma were included in this article.

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    A Method for Autonomous Driving Trajectory Planning in Parking Environments
    LIN Chun, HE Yuesheng, FANG Xingqi, WANG Chunxiang
    Journal of Shanghai Jiao Tong University    2023, 57 (3): 345-353.   DOI: 10.16183/j.cnki.jsjtu.2021.443
    Abstract399)   HTML155)    PDF (4106KB)(317)      

    Local trajectory planning is one of the key technologies of the autonomous valet parking system. In this scenario, there exist problems such as long planning time, discontinuous curvature, and insufficient safety in local trajectory planning methods for intelligent vehicles. Aimed at these problems, this paper proposes a trajectory planning method for intelligent vehicles in parking scenarios. This method improves the real-time performance and security of the initial path search by improving the analytic expansions of the hybrid A* algorithm and introducing the risk function. Further, according to the initial path, the quadratic programming method is used to realize path smoothing and speed planning. Finally, the trajectory generation is completed. Simulation experiments show that the method can improve the real-time, smoothness, and safety of intelligent vehicle trajectory planning. In addition, in actual parking environment, the feasibility of the method is verified in real-world vehicle experiments.

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    Investigation of serum uric acid level in adult patients and analysis of related influencing factors
    LUO Yadan, YUAN Liying, LU Yide, WANG Ziqiu, WANG Zhaohui
    Journal of Internal Medicine Concepts & Practice    2023, 18 (03): 141-145.   DOI: 10.16138/j.1673-6087.2023.03.002
    Abstract396)   HTML16)    PDF (567KB)(117)      

    Objective To investigate the distribution characteristics of hyperuricemia(HUA) and related influencing factors among the adult patients in Ruijin Hospital, and provide the clinical reference for prevention and treatment of HUA. Methods A retrospective study of serum uric acid was carried out on 47 100 people in Ruijin Hospital in June 2018, who were over 18 years old. Among them, 27 091 were males and 20 009 were females. The value of serum uric acid and distribution in different gender, age groups and clinical departments were studied. Results The total detection rate of HUA was 20.26%; it was 22.82% in male, and it was 16.88% in females. The serum uric acid level was negatively correlated with age in males, and females (≤50 years) (P<0.05), while it was positively correlated with female over 50 years (P<0.05). The high incidence age groups were 18-30 years in male, and in women over 71 years(P<0.05). Three departments with the highest HUA detection rate were the departments of nephrology, cardiac surgery outpatient and hypertension outpatient. Conclusions The detection rate of HUA in the study was high. The overall blood uric acid level in men was higher than that in women. The blood uric acid level in men gradually decreased with age, and the blood uric acid level in women showed a trend of decreasing and then increasing. Learning the distribution characteristics of uric acid in population could give help in strengthening education and prevention work in the susceptible population.

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    Application of Machine Learning in Chemical Synthesis and Characterization
    SUN Jie, LI Zihao, ZHANG Shuyu
    Journal of Shanghai Jiao Tong University    2023, 57 (10): 1231-1244.   DOI: 10.16183/j.cnki.jsjtu.2023.078
    Accepted: 24 May 2023

    Abstract384)   HTML46)    PDF (4421KB)(316)      

    Automated chemical synthesis is one of the long-term goals pursued in the field of chemistry. In recent years, the advent of machine learning (ML) has made it possible to achieve this goal. Data-driven ML uses computers to learn relative information in massive chemical data, find objective connections between information, train models by using objective connections, and analyze the actual problems which can be solved according to these models. With its excellent computational prediction capabilities, ML helps chemists solve chemical synthesis problems quickly and efficiently and accelerate the research process. The emergence and development of ML has shown a strong research assistance in the field of chemical synthesis and characterization. However, there is no highly versatile ML model at present, and chemists still need to choose different models for training and learning according to actual situations. This paper aims to show chemists the best cases of common learning methods in chemical synthesis and characterization from the perspective of ML, such as supervised learning, unsupervised learning, semi-supervised learning, reinforcement learning, etc., and help them use ML knowledge to further broaden their research ideas.

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