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    Journal of Diagnostics Concepts & Practice    2021, 20 (04): 317-337.   DOI: 10.16150/j.1671-2870.2021.04.001
    Abstract9245)   HTML517)    PDF(pc) (3337KB)(9225)       Save
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    Global Structural Strength Analysis Methodology of a Typical TLP
    Yang LI, Zhong-min SHI, Bin XIE, Wen-hui XIE
    Ocean Engineering Equipment and Technology    2014, 1 (1): 3-13.  
    Abstract268)   HTML1)    PDF(pc) (3686KB)(5506)       Save

    We focus on the global structure strength analysis of a typical tension leg platform (TLP). The objective of the TLP global structural analysis is to check the hull global structural integrity under design environmental conditions. Firstly, a global finite element model of the entire TLP is established, the hull structure is modeled in detail, whilst the deck structure is represented through a simplified deck beam model. A hydrodynamic analysis for operation and extreme conditions is conducted to get the design wave parameters for critical wave loads. After that, wave loads are mapped to the global structure finite element model, and the tendons are modeled as spring element which represents 6 degrees of freedom and rotations. Finally, the maximum stress and its distribution trends, together with the control elements, are obtained by finite element analysis according to critical wave heading, wave periods, wave heights and wave positions. Results and the TLP analysis method proposed can be used as reference for strength analysis of other offshore platforms.

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    Time-Varying Delay and Quantization Error
    LI Bin (李 斌), WAN Yi-ming (万一鸣), YE Hao (叶 昊)
    Journal of shanghai Jiaotong University (Science)    2011, 16 (5): 513-518.   DOI: 10.1007/s12204-011-1181-9
    Abstract1886)      PDF(pc) (303KB)(3061)       Save
    Abstract:  Problems related to fault detection of
    networked control systems (NCSs) with both uncertain time-varying
    delay and quantization error are studied in this paper. A novel
    model with the form of polytopic uncertainty is given to represent
    the influences of both the time-varying delay and the quantization
    error, and then the reference model based method is used to design
    the residual generator that is robust to both unknown
    network-induced delay and unknown inputs. A numerical example is
    also given to illustrate the merits of the presented method. The
    proposed method can be regarded as an extension of the
    authors' former work, which can only deal with time-varying delay.
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    Development of IT Industry in China in the New Age
    JIANG Ze-min
    Journal of Shanghai Jiaotong University   
    Abstract16677)            Save
    The article explains the role and future trend of IT industry, and states that information technology represented by the internet and computers has brought about the third industrial revolution in history. An important impetus for economic growth in modern times, the IT industry has greatly promoted sustainable development and is profoundly changing mankind’s way of life and production. In discussing the development trend of world IT industry, the article suggests that with potential new breakthroughs in IT technology, the trend of agglomeration and integration of industries has become increasingly obvious, competition of intellectual properties and strandards is intensifying and ubiquitous networks is taking shape. It points out that China should bring into better play the role of IT industry as an “amplifier” in economic growth, a “transformer” in development mode and a “propeller” in industrial upgrading. It is important to follow a policy that emphasizes indepandent innovation, marketdriven approach, open and compatible technologies, integrated and comprehensive application, and serving both military and civil purposes, so that a quantum leap of IT industry will be achieved. China should advance industrialization with IT technologles and promote the IT industry in the course of industrialization in an effort to build an IT industry with Chinese characteristics. Greater efforts should be made to develop such core sectors as microelectronics, computer, software, key components and materials, as well as sectors with international competitiveness, including broadband mobile communication, nextgeneration network and information services. Continued improvement should be made in the policies guiding the development of IT industry with a view to making China a country with a strong IT industry by 2020.
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    Journal of Diagnostics Concepts & Practice    2021, 20 (04): 401-406.   DOI: 10.16150/j.1671-2870.2021.04.014
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    New knowledge of prophylaxis and treatment about cancer-associated thrombosis
    DING Yongjie, ZHANG Liu, LI Qingyun
    Journal of Diagnostics Concepts & Practice    2023, 22 (04): 323-331.   DOI: 10.16150/j.1671-2870.2023.04.001
    Abstract88)   HTML8)    PDF(pc) (946KB)(2321)       Save

    Cancer-associated thrombosis (CAT) is the second leading cause of death in cancer patients, second only to the progression of the tumor. It leads to extended hospitalization and re-hospitalization, resulting in a serious social medical burden. Tumor-specific gene mutations such as JAK2, ALK, and KRAS mutations are closely related to the risk of CAT in patients with solid tumors. Patients treated with immune checkpoint inhibitors have a high risk of CAT, with a 1-year cumulative incidence rate of 10.86%. Therefore, accurate risk assessment is important. The Khorana risk score (KRS) is the first model to assess CAT risk and has been validated in several studies. The new generation models are based on the improvement of KRS, but they have not yet undergone large-scale external verification, such as the Vienna CAT model, PROTECHT model, and CONKO model. Due to the strong correlation between tumors and CAT, several CAT-related prevention guidelines have been established domestically and abroad. All of these guidelines recommend that patients undergo preventive anticoagulation therapy after tumor surgery. Low molecular weight heparin (LMWH) is the most widely used anticoagulant drug to prevent CAT. New oral anticoagulants (NOAC) are also used to prevent CAT, despite the incidence of hemorrhaging increases, the overall benefits to patients outweigh the risks. The strategy for treating CAT is complex. For patients with non-gastrointestinal tumors, NOAC can be used as a first-line drug, while LMWH is recommended for anticoagulation in patients with gastrointestinal tumors. Since CAT patients receive anticoagulation and anti-tumor therapy at the same time, drug interactions need to be considered to avoid drug-induced bleeding, especially the impact of combined medication on NOAC pharmacokinetics. The ideal length of anticoagulation therapy for CAT remains unclear. Guidelines recommend that patients with CAT should indefinitely continue the anticoagulation therapy after completing 3 to 6 months of initial anticoagulation therapy. Therefore, when determining the course of anticoagulation therapy for cancer patients, physicians should evaluate the risk of recurrence of thrombosis and bleeding, and optimize the treatment plan.

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    Clinical characteristics and risk factor analysis of 118 patients with cerebral venous sinus thrombosis
    LI Lei, WU Xi, DAI Jing, WU Wenman, DING Qiulan, WANG Xuefeng
    Journal of Diagnostics Concepts & Practice    2023, 22 (03): 261-269.   DOI: 10.16150/j.1671-2870.2023.03.09
    Abstract91)   HTML9)    PDF(pc) (991KB)(2316)       Save

    Objective: To analyze the clinical characteristics and thrombotic risk factors of cerebral venous sinus thrombosis (CVST) in Chinese population, in order to provide reference for the clinical diagnosis, prevention and treatment of CVST. Methods: A total of 118 CVST patients who visited the Thrombosis and Hemostasis Clinic of Ruijin Hospital from January in 2015 to December in 2022 were enrolled. The clinical data, imaging characteristics, and thrombotic gene panel were collected, and independent risk factors for thrombosis, recurrence, and multi-site thrombosis in CVST patients were studied through univariate and multivariate logistic regression. Results: Among 118 CVST patients, 88.1% (104/118) patients firstly developed CVST at age younger than 45 years old.It revealed that 57.6% patients (68/118) only suffered CVST once,and 33.1% patients (39/118) experienced thrombotic events at least twice, while 37.3% patients (44/118) suffered multi-site venous thromboembolism (VTE). The superior sagittal sinus was the most common venous sinus to form thrombosis (77/118), and multi-sites of venous sinus were involved simultaneously in 54.2% patients (64/118). The risk factor screening for thrombophilia showed that 70.3% patients (83/118) carried at least one thrombotic risk factor, including 53.3% patients (63/118) with inherited risk factors and 32.2% patients (38/118) with acquired risk factors. The main risk factors for males were anticoagulant protein deficiency (35/66) and antiphospholipid syndrome (5/66), while the risk factors for females mainly included anticoagulant protein deficiency (20/52), pregnancy/postpartum period (11/47), and contraceptive use (5/47). Among 35 patients with unknown risk factors, more than 30% of them experienced recurrent or multi-site thrombosis, and the underlying etiology in these patients still need to be further investigated. Univariate and multivariate logistic regression analysis showed that both inherited risk factors (odds ratio, OR=21.643, 95% confidence interval, CI 9.455-49.544, P<0.0001) and acquired risk factors (OR=10.836, 95% CI 4.306-27.270, P<0.0001) were independent risk factors for the occurrence of CVST. Genetic risk factor (OR=2.270, 95% CI 1.021-5.048, P=0.044) was an independent risk factor for recurrent thrombosis in CVST patients. Conclusions: In Chinese population, CVST is more common in middle-aged and young populations.,with 70.3% patients carrying at least one thrombotic risk factor. Genetic risk factors are the main cause of CVST in China and the detectable rate is 53.3%, which is significantly higher than that (22%) reported abroad. The patients with genetic risk factors have a significantly increased risk of developing CVST or recurrent thrombosis. Identification of thrombotic risk factors, prevention, diagnosis and treatment should be carried out earlier for individuals with high-risk CVST.

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    Interpretation of the Global Tuberculosis Report 2022 by World Health Organization
    LIANG Chen, YU Jiajia, TANG Shenjie
    Journal of Diagnostics Concepts & Practice    2023, 22 (01): 21-30.   DOI: 10.16150/j.1671-2870.2023.01.004
    Abstract727)   HTML36)    PDF(pc) (1105KB)(2288)       Save

    Global Tuberculosis Report 2022 (hereafter referred to as “report”), newly published by the World Health Organization (WHO), states that the coronavirus (COVID-19) pandemic has increased the tuberculosis (TB) disease burden and severely affected global TB prevention and control. In 2021, WHO approved a total of six molecular diagnostic technologies for TB diagnosis and anti-TB drug resistance detection, and three new TB antigen-based skin tests for TB screening were recommended. To reduce the burden on patients and the health system, WHO recommends a 4-month regimen for drug-susceptible TB and four shorter regimens for the treatment of multidrug-resistant/rifampicin-resistant tuberculosis (MDR/RR-TB). In addition, there were 26 drugs for TB treatment in clinical trials, and at least 22 clinical trials evaluating drugs and drug regimens for TB treatment were underway. In 2021, the TB epidemic remains severe in China, with the number of newly diagnosed cases ranking third among the 30 countries. In 2021, a total of 639 548 TB cases and 1 763 deaths were reported nationwide, with an incidence of 45.37/100 000 and a mortality of 0.13/100 000. China has the fourth largest number of MDR/RR-TB patients in the world. However, it is necessary to verify whether the regimens for MDR/RR-TB treatment recommended by WHO are suitable for patients in China.

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    Journal of Diagnostics Concepts & Practice    2021, 20 (04): 349-355.   DOI: 10.16150/j.1671-2870.2021.04.004
    Abstract751)   HTML23)    PDF(pc) (766KB)(1618)       Save
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    Association between 24-h ambulatory blood pressure variability and cardiac structure and function
    XU Tingyan, YANG Yan, LI Jingjing, ZHANG Dongyan, WANG Ying, WANG Jiguang, LI Yan
    Journal of Diagnostics Concepts & Practice    2019, 18 (2): 193-198.   DOI: 10.16150/j.1671-2870.2019.02.014
    Abstract435)   HTML0)    PDF(pc) (605KB)(1532)       Save

    Objective: To investigate the association between 24-h ambulatory blood pressure variability and cardiac structure and function in untreated patients. Methods: The association between 24-hour ambulatory blood pressure (BP) recordings and echocardiography in 80 untreated patients referred to a hypertension clinic was assessed. BP variability indices were standard deviation (SD), coefficient of variation (CV), variability independent of the mean (VIM), maximum-minimum difference (MMD), and average real variability (ARV). Effect sizes (standardized β)and partial coefficient of determination were computed using multivariable regression models. Results: Left ventricular mass index(LVMI) (systolic BP: β=6.8—8.0, P<0.01; diastolic BP: β=6.7—7.8, P<0.01), longitudinal strain(LS) (systolic BP: β=-0.76—-0.71, P<0.05; diastolic BP: β=-0.81—-0.71, P<0.05) and septal E/e' (systolic BP: β=0.44—0.57, P<0.05) were associated independently with BP, whereas the association with BP variability was not significant except for those of LVMI with systolic BP CV and VIM ( β=3.3, P=0.048, β=3.4, P=0.049), and of septal E/e' with diastolic BP MMD ( β=0.46, P=0.034). Conclusion: Short-term 24-h blood pressure variability is associated with cardiac structure and function, but blood pressure might be a major factor affecting these cardiac indices.

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    Value of proton and heavy ion radiotherapy in treatment of retroperitoneal sarcoma
    WANG Zheng, BAO Cihang, JIANG Guoliang
    Journal of Surgery Concepts & Practice    2022, 27 (06): 506-510.   DOI: 10.16139/j.1007-9610.2022.06.05
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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
    Abstract697)   HTML41)    PDF(pc) (1042KB)(1435)       Save

    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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    Modeling and Stability Analysis of a Pressure Compensator for Flow-Control Valve
    JIA Wen-Hua- , YIN Chen-Bo
    Journal of Shanghai Jiaotong University    2011, 45 (04): 561-564.  
    Abstract5653)            Save
    The forces acting on the load-sensing compensated valve were illustrated and analyzed, the mathematical model was generated using classical momentum principles, while the linear analysis of this was carried out using the Taylor expansions. The valve motion of the system was described by presenting the equation of motion, the stability condition was given by Routh-Hurwitz stability criterion and the dynamic properties of the compensator were studied. The CFD analysis of the compensator was described to study the effect of the force acting on the bottom of the compensator. The pressure along the bottom wall was noted and its variation was plotted against the geometrical position of the bottom wall that it acted on. Noted that this pressure remain constant along the wall. Then, some plots describe the flow induced forces and coefficients used to understand the stability of the compensator itself.
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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
    Abstract1948)   HTML63)    PDF(pc) (1494KB)(1319)       Save

    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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    Elastified Procedure for the Formfound Equilibrium State  and Zero-stress State of Cable-net Structure
    CHEN Wu-Jun, ZHANG Li-Mei, DONG Shi-Lin
    Journal of Shanghai Jiaotong University    2011, 45 (04): 523-527.  
    Abstract5124)            Save
    Six states and five analysis processes were pointed out for the whole numerical analysis process of cable-net structure. The six states are initial geometry state, form-found equilibrium state, elastified form-found equilibrium state, zero-stress (unstressed) state, pre-stress state and loading state, respectively. The five analysis process are form-finding analysis, elastified cable analysis, pre-stress analysis, inverse analysis and loading analysis. And the state parameters were clarified, also for the analytical model of different analysis procedures. The real zero-stress state does not exist generally, the assumed approximated zero-stress state is usually employed. On the basis of elastified form-found equilibrium state, the bestfit reasonable zero-stress state can be found through inverse analysis. The numerical algorithm and procedure was proposed for the ANSYS and EASY for cable-net analysis, and the emphasis is focused on the zero-stress state assumption. Finally, the numerical analysis was exemplified for two cablenet structures. The results demonstrate the significant difference with different zero-stress state assumption and the corresponding numerical analysis approaches.
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    Adaptive Consensus Fusion Estimation for Mobile Sensor Networks
    Wang-Lin, ZHANG Guo-Zhong, ZHU Hua-Yong, SHEN Lin-Cheng
    Journal of Shanghai Jiaotong University    2011, 45 (03): 383-0387.  
    Abstract4505)            Save
    To the problem of distributed estimation for mobile sensor networks(MSN)with communication delays and switching network topologies, a novel distributed fusion estimation algorithm, named adaptive consensus based bistributed unscented information filter(AC_DUIF), was presented. The proposed algorithm was based on unscented information filter, adaptive consensus algorithm, as well as a new fusion framework for the consideration of the communication delays. An application of target tracking using an air mobile sensor networks with dynamically switched network topologies was employed to illustrate the performance of the proposed algorithm. The simulation results show that the proposed method can significantly improve the accuracy of target position estimation of each sensor node in a distributed fashion, when the distributed consensus between each nodes and the adaptability of the communication delays are assured.
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    A Method for Multitarget Passive Location by a Movable Single Station  Based on Weighted MUSIC Algorithm in FRFT Domain
    HE Wei-Yan, JIN Rong-Hong, GENG Jun-Ping, LIANG Xian-Ling
    Journal of Shanghai Jiaotong University    2011, 45 (03): 345-0349.  
    Abstract4435)            Save

    Aiming at the situation of multiple linear frequency modulation(LFM) signal sources, by analyzing the Doppler shift of received signals, a multicomponent LFM signal model for the antenna array on a movable single station was built. Then a method for multitarget passive location based on weighted MUSIC algorithm in fractional Fourier transformation(FRFT) domain was presented, which implements the detection and DOA estimation of multitarget signals at low SNR. The simulation results show that  multiple targets with similar frequency and close space can be distinguished in a high accuracy.
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    A SINS Coning Compensation Algorithm Based  on Gyro Error PostCompensation
    LI Zong-Tao-a, b , WU Tie-Jun-b, MA Long-Hua-b
    Journal of Shanghai Jiaotong University    2011, 45 (03): 388-0392.  
    Abstract5226)            Save
     The coning compensation computation in strapdown inertial navigation system(SINS) attitude updating algorithms is based on the use of compensated gyros incremental angle outputs,  the gyro output errors compensation has to be performed at the high rate of gyro output sampling,thus increasing the throughout of the navigation compater. A postcompensation algorithm was proposed to solve this problem by calculating the coning compensation with uncompensated gyros incremental angle outputs and then compensating for gyros output errors at the updating rate of coning compensation that is lower than the gyro output sampling rate. The simulation results show that the coning compensation accuracy of the proposed postcompensation algorithm is almost the same as that of traditional precompensation algorithms, but the throughput of the navigation computer is significantly reduced.
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    Adaptive limited feedback for MUMIMO system
    WU Youlong,LUO Hanwen,LIU Wei,DING Ming,Wang Hailong
    Journal of Shanghai Jiaotong University    2011, 45 (03): 313-0320.  
    Abstract4571)            Save
    The limited feedback in multiuser MultipleInput MultipleOutput (MUMIMO) systems is addressed in this paper. In order to reduce the feedback overhead in the uplink channel, we analyze the relation between user’s feedback bits and rate, deduce the optimal solution for adaptive limited feedback, and propose a suboptimal feedback scheme which is more practical. In this scheme, users choose the feedback bits according to both their channel gains and the average gain of the system. Users with high SNR are assigned with more feedback bits than the lowSNR users so as to improve the feedback efficiency. Simulation results and analysis show that the proposed scheme is easytoimplement and can enhance the throughput with no additional feedback overhead.
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    The Influence of Formation Manner of Component on Signal Processing Effect of Singular Value Decomposition
    ZHAO Xue-Zhi, YE Bang-Yan
    Journal of Shanghai Jiaotong University    2011, 45 (03): 368-0374.  
    Abstract4496)            Save
     Aimed at the formation manner of component signal in singular value decomposition (SVD), the difference of signal processing effect between the simple manner and the average manner was studied. Firstly, for the average manner, a convenient algorithm to get the average of matrix elements is proposed according to the characteristic of Hankel matrix. Secondly, it is proved that the original signal can be decomposed into the linear sum of a series of component signals by SVD with both manners, and a parameter called loss ratio is proposed to evaluate the signal processing effect of both manners. The studying results show that for sine signals, there is no difference between the processing effects of the two manners, while for frequency change signals, the average manner has the advantage of the simple one, however, both manners have extracted the modulated signal caused by the damage in roll track from the complicated vibration signal of a bearing, but the computation amount of the average manner is much larger than that of the simple one. It is recommended that except frequency change signal, for other common signals the simple method should be prior used.
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    ClosedForm BER Analysis of DSUWB Systems Using Narrowband Interference Suppression Technology
    GONG Ling-Song, WANG Cheng, YANG Yu-Hang, ZHU Rong-Bo
    Journal of Shanghai Jiaotong University    2011, 45 (03): 358-0362.  
    Abstract3979)            Save
    In order to accurately evaluate the bit error rate(BER) of DSUWB systems with narrowband interference suppressor, a method based on characteristic function (CF) is proposed for precisely calculating the BER of DSUWB systems using twosided transversal filters for rejection of single tone interference. We derive a mathematical expression called interference suppression factor of twosided transversal filters. In addition, theory analyses show that with sufficiently large tap number, the tone interference could be almost cancelled totally. The simulation and numerical results validate the accuracy and effectiveness of analytical BER derivations.
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    Frequency Planning in RelayAided Cellular Network
    LIN Yi-Ru-1, GUO Jia-1, LUO Han-Wen-1, ZHOU Xiao-Lin-2
    Journal of Shanghai Jiaotong University    2011, 45 (03): 336-0339.  
    Abstract4462)            Save
    This paper proposes a new frequency planning scheme for the proposed cellular wireless system using fix relay. Our scheme improves the frequency efficiency, while relatively improving the CEU’s SIR through frequency planning based on fractional frequency reuse. The simulation results show that it can improve the performance of frequency efficiency compared with others scheme, CEU’s average throughput is improved.
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    Grating Lobe Suppression for Contiguous Subarray with Uniform Structure
    CHEN Bi-Xian, JIN Rong-Hong, GENG Jun-Ping, LIANG Xian-Ling
    Journal of Shanghai Jiaotong University    2011, 45 (03): 340-0344.  
    Abstract5311)            Save
     When large scale arrays are divided into subarrays of equal sizes a difficulty with grating lobes is encountered during scanning. The condition of producing the grating lobe was discussed at first, and on this basis, a new method of beam scanning at uniform subarray level was proposed for the purpose of reducing the grating lobe by dividing the scanning region. The fundamental rules of scanning regional division and how to optimize the weights of all angles in each scanning region at elements level and subarray level by particle swarm optimization (PSO) were also discussed. As an example, an array of three subarray with four elements was simulated and the results show that the maximum sidelobe level can be reduced to -22 dB in each scanning region. This approach also can be used for multibeam forming.
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    Fast Approximate Clustering Algorithm and Its Application in Image Retrieval
    GU Wangyi,ZHU Lin,YANG Jie
    Journal of Shanghai Jiaotong University    2011, 45 (02): 149-0153.  
    Abstract5475)            Save
    The fast approximate Kmeans algorithm (FAKM) was proposed to solve the limitations of traditional Kmeans algorithm in the large scale database. Based on the approximate Kmeans algorithm (AKM), FAKM classifies the cluster centers according to cluster results. This new algorithm filters out the cluster centers with few samples, and makes good use of those with intensive and stable samples, and thus the number of samples and clusters will reduce in each iteration. Accordingly it can improve the speed of this algorithm and refine the cluster result. Several experimental results in image retrieval system are presented to demonstrate its average advantage over Kmeans and AKM in the clustering time, retrieval time and the robustness capability of retrieval accuracy.
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    Twodimensional Cross Entropy Thresholding Based on Chaotic Resilient Particle Swarm Optimization or Decomposition
    WU Yi-Quan, ZHANG Xiao-Jie, WU Shi-Hua
    Journal of Shanghai Jiaotong University    2011, 45 (03): 301-0307.  
    Abstract4380)            Save
    A twodimensional cross entropy image thresholding method based on chaotic resilient particle swarm optimization (CRPSO) or decomposition was proposed. Firstly, chaotic resilient particle swarm optimization was used to find the optimal threshold of twodimensional cross entropy method. The recursive algorithm was adopted to avoid the repetitive computation of fitness function in iterative procedure. As a result, the computing speed was improved greatly. Then, the computation of twodimensional cross entropy method was converted into two onedimensional spaces, which made the computation complexity further reduce from O(L2) to O(L). The experimental results show that, the two methods proposed in this paper can greatly reduce the running time while the segmented result is as good as or better than the existing twodimensional cross entropy thresholding method.
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    Experimental Study on Resistance Reduction of Displacement Type Deep-V Hull Model Using Stern Flap
    ZHENG Yi, DONG Wen-Cai, YAO Chao-Bang
    Journal of Shanghai Jiaotong University    2011, 45 (04): 475-480.  
    Abstract5955)            Save
    Model tests of kiloton displacement type deep V ship series using stern flap for resistance reduction were carried through. The flap chord varies from 0.010 Lwl to 0.023 Lwl, install angle changes from 3° to 10°, and the test speed range from Fr=0.12 to 0.52. The influence of ship speed, flap chord and install angle on resistance reduction rate and running trim were investigated based on test data. Optimized stern flap parameters with application range were obtained for this particular ship form.
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    Review of Research on Condition Assessment of Nuclear Power Plant Equipment Based on Data-Driven
    XU Yong, CAI Yunze, SONG Lin
    Journal of Shanghai Jiao Tong University    2022, 56 (3): 267-278.   DOI: 10.16183/j.cnki.jsjtu.2021.502
    Abstract3693)   HTML318)    PDF(pc) (1383KB)(1213)       Save

    The condition assessment of the entire life cycle of nuclear power equipment has a significant impact on improving the safety and economy of nuclear power plants. In the past, operation and maintenance of systems, equipment, and structures of domestic nuclear power plants, mostly relied on the alarm mechanism of equipments, the simple threshold judgments of parameters, or the empirical judgments of engineers. With the implementation of online monitoring system in nuclear power plants, a large number of equipment operation data have been accumulated, and the use of data-driven technology to assess the health of equipment has become the focus of attention in the industry. In this paper, the current situation of the online monitoring system of nuclear power equipment was introduced and the common malfunction of nuclear power equipment was analyzed. The condition assessment of nuclear power equipment were categorized into three major problems (i.e., anomaly detection, life prediction, and fault diagnosis), the situation of research and application were summarized respectively, and the application potential of deep learning technology in this field was emphasized. Based on this, the challenges and possible solutions to the condition assessment of nuclear power plant equipment were further analyzed.

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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
    Abstract851)   HTML13)    PDF(pc) (4954KB)(1211)       Save

    “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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    Calculation of HighPrecision Pseudocritical Temperatures for Transcritical Transient Analysis
    FU Sheng-Wei, ZHOU Chong, YANG Yan-Hua, CHENG Xu
    Journal of Shanghai Jiaotong University    2011, 45 (03): 413-417.  
    Abstract4452)            Save
    The development of thermalhydraulic system code applicable for transcritical transients’ calculation requires the support of a pseudocritical temperature calculating module with high precision. Based on the accurate data of pseudocritical temperatures obtained by the IAPWSIF97 thermalphysical property equations, the relation between pseudocritical temperature and pressure was fitted. The fitting equations are capable of providing pseudocritical temperatures with good precision. This paper presented the implementation of the fitting equations into a thermalhydraulic system code, as well as simulation of some simple transcritical transients. The results indicate that the pseudocritical temperature calculating method developed in this paper is applicable.
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    A User Pairing Algorithm for Virtual MIMO Systems
    Jiang-Wu-Yang, LIU Wei, DING Ming, LUO Han-Wen
    Journal of Shanghai Jiaotong University    2011, 45 (03): 350-0353.  
    Abstract4553)            Save
    A novel user pairing algorithm for virtual MIMO systems was proposed based on semiorthogonal user selection (SUS) with partial inverse selection. To solve the problem that users with bad channel condition suffer from low throughput in the traditional SUS algorithm, this paper proposed a mechanism called ‘inverse selection’, which is derived from the analysis of the MMSE receiver. The simulation results show that the new algorithm largely improves the throughput of users with poor SINR at a reasonable cost of the overall throughput decrease, thus achieving a profitable tradeoff between system throughput and user fairness.
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    A Multiuser Scheduling Algorithm for MIMO Broadcast Channels with Limited Feedback
    LI Jun-Fei, YU Hui, LUO Han-Wen, DING Ming
    Journal of Shanghai Jiaotong University    2011, 45 (03): 379-0382.  
    Abstract4402)            Save
    This paper addresses the issue of multiuser scheduling with limited feedback in MIMO broadcast channels. A new user selection algorithm was proposed. In order to exploit multiuser diversity, users feedback the estimation of the available transmit rates as well as the channel directional information. At first, the transmitter divides all the codewords into groups according to their crosscorrelation coefficients. When scheduling, the users are assigned to different groups corresponding to different code regions and then the active user group is selected among the groups. Simulation results show that the presented algorithm can achieve good sumrate performance and obtain the optimal multiuser diversity, with low computational complexity.
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    A Relay Scheduling Algorithm in DualHop Wireless Networks
    Zhang-Yu, LUO Han-Wen, ZHOU Xiao-Lin
    Journal of Shanghai Jiaotong University    2011, 45 (03): 331-0335.  
    Abstract3895)            Save
    This paper proposed a relay node iterative scheduling algorithm based on the channel capacity maximization for dualhop wireless networks. Based on the amplifyandforward relay protocol, the proposed algorithm selects relay nodes iteratively according to the criterion which makes the instantaneous capacity maximal when the destination node performs the joint decoding. The selection process continues until the number of the selected relays is equal to the number of source transmitting antennas or the channel capacity does not increase anymore. The simulation results show that under different conditions including total number of relay nodes, number of source transmitting antennas and signal to noise ratios of the forward and backward channels, the algorithm can obtain greater capacity gains and multirelay diversity gains over conventional algorithms and can reach the upper bound of the informationtheoretic capacity more closely.
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    Research of Sliding Mode Controller for Flight Simulator Based  on Disturbance Observer
    LIU Xiao-Dong, WU Yun-Jie, TIAN Da-Peng, WANG Jun-Feng
    Journal of Shanghai Jiaotong University    2011, 45 (03): 393-397.  
    Abstract5048)            Save
    Because disturbance observer (DOB) underestimates the equivalent disturbances in flight simulator system, one sliding mode variable structure controller (SMVSC) based on DOB was proposed. The controller introduces additional compensation for disturbances, velocity and acceleration of tracking signals, and a new sliding approach law for the SMVSC was defined, then the system meets the conditions for the existence of generalized sliding mode. The experiments on one singleaxis flight simulator show that the proposed control scheme improves the tracking performance with more robustness against parameter uncertainty and extern disturbance, contrasted with the traditional PD+DOB scheme.
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    Algorithm for Relative Position and Attitude of  RVD Based on Dualquaternion
    ZHANG Ze, DUAN Guang-Ren, SUN Yong
    Journal of Shanghai Jiaotong University    2011, 45 (03): 398-402.  
    Abstract4201)            Save
    Traditional algorithm for the determination of relative position and attitude between target spacecraft and tracking spacecraft of RVD is to obtain the direction cosine matrix and translation vector respectively, but this method can not hold the integrity of the rigid body motion, and also, the solving speed and convergence influence the realtime characteristic and the accuracy of the measurement. This paper proposed a new algorithm based on dualquaternion to overcome the disadvantage of the traditional method. The integrity of the relative rotation and translation between the two coordinates is considered. At last, the simulation results show the effectiveness of the new algorithm.
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    An Algorithm of Optimizing Throughput in Multi-relay Cooperativ Networks
    LI Qian-Wen, JIANG Ling-Ge, HE Chen, ZHAN Ao
    Journal of Shanghai Jiaotong University    2011, 45 (03): 363-0367.  
    Abstract4816)            Save
     This paper considers a wireless network with single sourcedestination pair and multiple potential relays, in which each node accumulates the received information to recover source information, then based on dynamic decode and for ward(DDF) protocol, a relay selection and transmission algorithm is proposed. Firstly, a corresponding mathematical problem of minimizing information’s transmission time is exactly formulated. Moreover, it is proved to be a nondeterministic polynomial complete (NPC ) problem. Secondly, a suboptimal distributed greedy algorithm is proposed, which synthetically considess the chosen relay’s uplink and downlink gains. Not only the chosen relay is ensured to estimate the source information easily but also the network terminal is guaranteed to receive more effective decoding information. Finally, simulation results show that the proposed algorithm almost achieves the optimal network performance. Meanwhile its distributed implement decreases system overhead efficiently.
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    Autonomous Orbit Determination of Satellite Navigation System
    Based on Unscented Kalman Filter
    ZHAO Xiao-Fang, LIU Sheng-Gang, HAN Chao
    Journal of Shanghai Jiaotong University    2011, 45 (03): 433-438.  
    Abstract4150)            Save
    In accordance with the highly nonlinear of orbit dynamics and the precision requirement of the autonomous orbit determination for navigation constellation, a parallel autonomous orbit determination method based on the dual direction range measurement was proposed. In this method, the unscented Kalman filter is used as the onboard estimation algorithm for each satellite to get its own state and the extra covariance used in this filter which is introduced by the priori orbit is given to ensure the filter stability. The simulation results show that the new method can maintain the long term autonomous orbit determination and the precision of the satellite orbits.
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    Dynamics Modeling and Validation of Coaxial Lifting Rotors
    HU Jinshuo, HUANG Jianzhe
    Journal of Shanghai Jiao Tong University    2022, 56 (3): 395-402.   DOI: 10.16183/j.cnki.jsjtu.2021.044
    Abstract4029)   HTML107)    PDF(pc) (2567KB)(1178)       Save

    The dynamics model for coaxial lifting rotors can be used to study the controller design and flight simulation for coaxial-rotor aerial vehicles. However, both the computational efficiency and the accuracy should be considered. First, the computational model of the induced velocity of lifting rotor everywhere including the wake region is derived based on adjoint theorem. Then, the finite state dynamics model for coaxial lifting rotors with wake skew considered is developed by extending the finite state inflow model for single rotor. Finally, the equations for calculating the thrust of coaxial lifting rotors in the hover condition are given, and the test is conducted. The results show that the computational complexity of the proposed dynamics model for coaxial lifting rotors is acceptable, and the computational thrusts are almost close to the test results when the rotational speed is within a certain range, which can also reflect the trend of the thrust lost for coaxial lifting rotors.

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    Potential Energy Study of Mooring System Based on Catenary Method
    YUAN Meng, FAN Ju, ZHU Ren-Chuan, MIAO Guo-Ping
    Journal of Shanghai Jiaotong University    2011, 45 (04): 597-603.  
    Abstract3940)            Save
    To understand the mooring energy during positioning, the configuration and tension of three types of mooring lines were derived using catenary formula. The gravitational and elastic potential energy distributions of a single mooring line with the lower end fixed were calculated for different upper end positions. The horizontal force calculated from potential energy was compared with that of calculation directly, and the results show good agreement, and satisfy the law of conservation of energy and also prove the correctness of the results of potential energy. For a deep-water platform moored by nine composite mooring lines, the potential energy distributions of the mooring system were analyzed, and the offset-lateral force relations were compared in different directions. They are found to meet each other very well, which indicates a balanced performance of the mooring system. The potential energy distributions and the offsetlateral force relations in different wave directions were calculated for the damaged case. From the results, it can be found that the potential energy distribution can reflect the performance of the mooring system in all directions effectively, which has important practical value in ocean engineering.
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    Energy Consumption Analysis and Improvement Strategy for ClusterHead Rotation in Wireless Sensor Networks
    DENG Han-Lin, LI Lei, HUANG He-Qing, YUAN Xiao-Bing, WANG Ying-Guan
    Journal of Shanghai Jiaotong University    2011, 45 (03): 321-0326.  
    Abstract4256)            Save
    To design a more energyefficient cluster head rotation (CHR) strategy for wireless sensor networks, this paper built an analytical model for the energy consumption of contentionbased CHR, analyzed the energy consumption ratio between data gathering and CHR, and proposed a schedulebased CHR, which could remove the energy consumption in CHR. The simulation results show that the schedulebased CHR obviously improves energy efficiency and energy consumption balance in the cluster.
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