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Particuology 2020年第4期18卷 142-154页

作者： Krishnadash SKshetrimayum Seongho Park Chonghun Han Chul-Jin lee School of Chemical Engineering and Materials Science Chung-Ang University06974 SeoulSouth Korea School of Chemical and Biological Engineering Seoul National UniversitySan 56-1Shillim-dongKwanak-guSeoul151-742South Korea

The energy minimization multi-scale(EMMS)is a heterogeneous drag model widely used to simulate gas-solid fluidized *** this work,we conducted computational fluid dynamics simulations of a gas-solid fluidized bed for Geldart B particles to compare the EMMS with the homogeneous Gidaspow drag *** results from both the homogeneous and heterogeneous drag models were compared with literature experimental data on pressure drop and bed *** was no noticeable difference in predicted bed characteristics in the slugging ***,in the turbulent regime,the EMMS model predicted slightly lower bed expansion than did the Gidaspow *** evaluated the effects of solid-solid and solid-wall interaction parameters by varying the restitution and specularity *** expansion increases by a factor of 1.05-1.08 when the restitution coefficient increases from 0.9 to *** models predict a higher solid volume fraction and higher solid downflow velocity near the wall for a low specularity coefficient of 0.01 or *** we considered solid phases of different sizes to model polydisperity,the simulation predicted vertical segregation of 300,350,and 400μm in the fluidized region due to ***,the drag models made similar predictions in bad characteristics from cold model simulation ofa polysilicon fluidized-bed reactor,although there was very little vertical segregation of solid particles for this case.

关键词： CFD simulation Energy minimization multi-scale drag Gas-solid fluidized bed Polydisperity Fluidized-bed reactor

Propulsive Velocity Optimization of 3-Joint Fish Robot Using Genetic-Hill Climbing Algorithm

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Journal of Bionic Engineering 2009年第4期6卷 415-429页

作者： Tuong Quan Vo Hyoung Seok Kim Byung Ryong lee School of Mechanical and Automotive Engineering University of UlsanSan 29Muger 2-dongNam-guUlsan 680-749Korea

Underwater robot is a new research field which is emerging quickly in recent *** researches in this field focus on Remotely Operated Vehicles(ROVs),Autonomous Underwater Vehicles(AUVs),underwater manipulators,*** robot, which is a new type of underwater biomimetic robot,has attracted great attention because of its silence in moving and energy efficiency compared to conventional propeller-oriented propulsive mechanism. However,most of researches on fish robots have been carried out via empirical or experimental approaches,not based on dynamic *** this paper,we proposed an analytical optimization approach which can guarantee the maximum propulsive velocity of fish robot in the given parametric ***,a dynamic model of 3-joint(4 links)carangiform fish robot is derived,using which the influences of parameters of input torque functions,such as amplitude,frequency and phase difference,on its velocity are investigated by ***,the maximum velocity of the fish robot is optimized by combining Genetic Algorithm(GA)and Hill Climbing Algorithm(HCA).GA is used to generate the initial optimal parameters of the input functions of the ***,the parameters are optimized again by HCA to ensure that the final set of parameters is the'near'global ***,both simulations and primitive experiments are carried out to prove the feasibility of the proposed method.

关键词： fish robot carangiform velocity optimization propulsive model

Decomposition kinetics of dimethyl methylphospate(chemical agent simulant) by supercritical water oxidation

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Journal of Environmental Sciences 2006年第1期18卷 13-16页

作者： Bambang VERIANSYAH Jae-Duck KIM Youn-Woo lee Supercritical Fluid Research Laboratory Korea Institute of Science and Technology(KIST) 39-1 Hawolgok-dong Seoungbuk-gu Seoul 136-791 Korea. School of Chemical and Biological Engineering Seoul National University(SNU) San 56-1 Sillim-dong Gwanak-gu Seoul 151-744 Korea

Supercritical water oxidation （SCWO） has been drawing much attention due to effectively destroy a large variety of high-risk wastes resulting from munitions demilitarization and complex industrial chemical. An important design consideration in the development of supercritical water oxidation is the information of decomposition rate. In this paper, the decomposition rate of dimethyl methylphosphonate（DMMP）, which is similar to the nerve agent VX and GB（Sarin） in its structure, was investigated under SCWO conditions. The experiments were performed in an isothermal tubular reactor with a H2O2 as an oxidant. The reaction temperatures were ranged from 398 to 633℃ at a fixed pressure of 24 MPa. The conversion of DMMP was monitored by analyzing total organic carbon （TOC） on the liquid effluent samples. It is found that the oxidative decomposition of DMMP proceeded rapidly and a high TOC decomposition up to 99.99% was obtained within 11 s at 555℃. On the basis of data derived from experiments, a global kinetic equation for the decomposition of DMMP was developed. The model predictions agreed well with the experimental data.

关键词： supercritical water oxidation kinetics chemical agent DMMP

Deformation nanomechanics and dislocation quantification at the atomic scale in nanocrystalline magnesium

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Journal of Magnesium and Alloys 2020年第4期8卷 1296-1303页

作者： Md.Shahrier Hasan Rachell lee Wenwu Xu Department of Mechanical Engineering San Diego State UniversitySan DiegoCA 92182United States

Classical molecular dynamics(MD)simulation method is employed to study the uniaxial tensile deformation of nanocrystalline magnesium(Mg)of varying grain size *** mean grain size of the sample is varied from 6.4 nm to 45 nm,with each sample containing about 43 million atoms in the modeling *** deformation nanomechanics reveals two distinct deformation *** larger grain-sized samples,dislocation dominated deformation is observed while,in smaller grain-sized samples,grain boundary-based mechanisms such as grain boundary sliding,grain boundary rotation are *** transition of normal and inverse Hall-Petch relation occurs at around *** density quantification shows that the dislocation density in the sample drastically reduces with decreasing grain *** modulus of nanocrystalline Mg with mean grain size above 20 nm remains comparable to that of the coarse-grained polycrystalline bulk,followed by a rapid reduction below that grain *** present work reveals the nanomechanics of nanocrystalline Mg,facilitating the design and development of Mg-based nanostructured alloys with superior mechanical properties.

关键词： Nanomechanics Dislocation Molecular dynamics Nanocrystalline Magnesium

Investigations of an Air Starting Motor of Marine Medium-Speed Diesel Engine with Numerical Analyses

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Journal of Thermal Science 2010年第2期19卷 148-153页

作者： Yeon Won lee Yoon Hwan Choi Deog Hee Doh Division of Mechanical Eng. Pukyong National Univ.San 100 Division of Mechanical and Information Eng.

The marine medium-speed diesel engines are started by two methods;one is the electric motors,and the other air starting *** though air starting motor is dependent of the engine types and sizes,it has been widely used in this area due to its simplicity,convenience and *** purpose of this paper is to give the designing parameters in order to make a proper "Air Starting Motor" using *** aerodynamic approaches were given to understand the internal flow characteristics of the air starting *** addition,we have carried out the investigation of effects of tip *** the calculations the tip clearance of air starting motor has been varied between 0,2.8,4.3 and 5.7% of blade *** results of computation are the tip clearance increased to 2.8%,the torque decreased 24%,and there was no more large changes when the clearances increased to 4.3% and 5.7%.

关键词： Medium-Speed Diesel Engine Air Starting Motor CFD Tip Clearance Influences

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基于大语言模型的糖尿病管理:潜力与展望

Science Bulletin 2024年第5期69卷 583-588页

作者：盛斌管洲榆 lee-Ling Lim 江泽铧 Nestoras Mathioudakis 李佳佳刘茹涵包玉倩 Yong Mong Bee 王亚星郑颖丰 Gavin Siew Wei Tan 纪宏伟 Josip Car 王海波 David C.Klonoff 李华婷覃宇宗黄天荫贾伟平 Shanghai International Joint Laboratory of Intelligent Prevention and Treatment for Metabolic Diseases Department of Computer Science and EngineeringSchool of ElectronicInformationand Electrical EngineeringShanghai Jiao Tong UniversityDepartment of Endocrinology and MetabolismShanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai Diabetes InstituteShanghai Clinical Center for DiabetesShanghai 200240China MOE Key Laboratory of Artificial Intelligence Artificial Intelligence InstituteShanghai Jiao Tong UniversityShanghai 200240China Department of Medicine Faculty of MedicineUniversity of MalayaKuala Lumpur 50603Malaysia Department of Medicine and Therapeutics The Chinese University of Hong KongHong KongChina Asia Diabetes Foundation Hong KongChina Tsinghua Medicine of Tsinghua University Beijing 100084China School of Clinical Medicine Beijing Tsinghua Changgung HospitalBeijing 102218China Division of Endocrinology Diabetes&MetabolismJohns Hopkins University School of MedicineBaltimoreMD 21211USA Department of Endocrinology Singapore General HospitalSingapore 169608Singapore Beijing Institute of Ophthalmology Beijing Tongren HospitalCapital University of Medical ScienceBeijing Ophthalmology and Visual Sciences Key LaboratoryBeijing 100730China State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangzhou 510060China Singapore Eye Research Institute Singapore National Eye CentreSingapore 168751Singapore Department of Cardiology the Affiliated Hospital of Qingdao UniversityQingdao 266011China Centre for Population Health Sciences Lee Kong Chian School of MedicineNanyang Technological University SingaporeSingapore 639798Singapore Department of Primary Care and Public Health School of Public HealthImperial College LondonLondon SW72BUUK Clinical Trial Unit Research Centre of Big Data and Artificial Intelligence in Medicine

The increasing prevalence of diabetes has become a global public health concern in the 21st *** 2021,it was estimated that 537 million people had diabetes,and this number is projected to reach 643 million by 2030,and 783 million by 2045[1].Such a huge burden of diabetes brings great challenges in its prevention and management,including early diagnosis,timely interventions,and regular monitoring of risk factor control and complications *** self-care support and patient empowerment can enhance clinical and psychobehavioural outcomes[2],although these require additional resources including manpower,infrastructure(hard and technology),and *** emergence of digital health technologies(DHTs),especially artificial intelligence(AI),may help address these obstacles and alleviate the burden of diabetes[3].Large language models(LLMs),a generative AI that can accept image and text inputs and produce text outputs,have shown promise in various aspects of medical care.

关键词： prevention diagnosis finance

A Potential Anti-metastatic Chinese Herb Andrographis paniculata—Its In Vitro Activities in Esophageal Cancer Cells and Endothelial Cells

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A Potential Anti-metastatic Chinese Herb Andrographis panicu...

On Product-Cordial Index Sets and Friendly Index Sets of 2-Regular Graphs and Generalized Wheels

第十四届全国中药和天然药物学术研讨会

作者： Grace Gar-lee Yue Julia Kin-Ming lee Kar-Man Chan Kwok-Pui Fung Philip Wai-Yan Chiu Clara Bik-san Lau The Chinese University of Hong Kong

＜正＞Esophageal cancer is associated with high postoperative recurrence and systemic *** adjuvant chemotherapy and concurrent radiation have shown favourable efficacies,searching for alternative treatments for metast...

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Acta Mathematica Sinica,English Series 2012年第4期28卷 661-674页

作者： Harris KWONG Sin Min lee Ho Kuen NG Department of Mathematical Science SUNY Fredonia Department of Computer Science San Jose State University Department of Mathematics San Jose State University

A vertex labeling f ： V →Z2 of a simple graph G = （V, E） induces two edge labelings The friendly index set and the product-cordial index set of G are defined as the setsf is friendly}. In this paper we study and determine the connection between the friendly index sets and product-cordial index sets of 2-regular graphs and generalized wheel graphs.

关键词： Friendly index set product cordial index set 2-regular graphs generalized wheels

Stability analysis for time delay control of nonlinear systems in discrete-time domain with a standard discretisation method

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Control Theory and Technology 2020年第1期18卷 92-106页

作者： Jinoh lee Gustavo A.MEDRANO-CERDA Je Hyung JUNG Advanced Robotics Istituto Italian.di TecnologiaVia Morego 30Genoa16163Italy Tecnalia Research and Innovation Mikeletegi Pasealekua1-3E-20009Donostia-San SebastianSpain

This paper provides stability analysis results for discretised time delay control(TDC)as implemented in a sampled data system with the standard form of zero-order *** first substantiate stability issues in discrete-time TDC using an example and propose sufficient stability criteria in the sense of *** parameters significantly affecting the overall system stability are the sampling period,the desired trajectory and the selection of the reference model dynamics.

关键词： Time delay control(TDC) discretisation stability analysis zero-order hold

Outcomes of emergency and interval hepatectomy for ruptured resectable hepatocellular carcinoma: a single tertiary referral centre experience

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Hepatoma Research 2017年第9期3卷 196-204页

作者： Andrew Kai Yip Fung Charing Ching Ning Chong Kit Fai lee John Wong Yue Sun Cheung Anthony Kwong Wai Fong Paul Bo san Lai Department of Surgery the Chinese University of Hong KongPrince of Wales HospitalHong Kong 999077Hong KongChina

Aim: The short and long term outcomes of patients who underwent emergency and interval hepatectomy for ruptured and resectable hepatocellular carcinoma (HCC) were analysed. Methods: The data of patients with ruptured HCC presenting between April 2004 and October 2015 were analysed. Emergency hepatectomy was defined as hepatectomy within 48 h of the clinico-radiological diagnosis of HCC rupture. Results: Thirty patients underwent hepatectomy for ruptured HCC. Nine (30%) patients underwent emergency hepatectomy. The median age was 56 and 54 years (P = 0.13) with a similar gender distribution. The mean HCC size (10.5 vs. 8.3 cm, P = 0.17), total blood loss (3,000 vs. 850 mL, P = 0.002) and total units of red blood cell transfusion (1.9 vs. 0.5 units, P = 0.27) were greater in the emergency hepatectomy group. The complication rate was 44% and 38% (P = 0.53), with median length of hospital stay of 10 and 12 days (P = 0.07) in the emergency and interval hepatectomy groups, respectively, and no 30-day mortality in both groups. The median overall survival was 29 and 15.7 months (P = 0.25), with survival rates of 78%, 45%, 0% and 85%, 43% and 5% at 1, 3 and 5 years in the emergency and interval hepatectomy groups, respectively. Conclusion: Hepatectomy should be considered for ruptured HCC provided the patient could tolerate curative resection.

关键词： Hepatocellular carcinoma rupture hepatectomy