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RF channel performance assessment for a multiple carrier millimeter-wave communication system

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Progress in Natural Science:Materials International 2004年第10期14卷 45-48页

作者： Thomas wong Chicago Department of Electrical and Computer Engineering Illinois Institute of Technology Illinois60616 U.S.A

Channel capacity,system versatility and ease of maintenance are factors of prime concern in future generations of wire-less communication *** a result,millimeter-wave can offer considerable advantages in providing broadband *** and noise effects,including parametric fluctuations,are two significant causes for signal degradation in broadband communication *** methods to assess the performance of an RF channel in a multi-carrier system are *** measuring the forward transfer func-tion from transmitter IF to receiver IF as the frequency is swept across the channel bandwidth,characteristics such as gain flatness,chan-nel dispersion,and saturation effects are *** evaluate the ability of the communication link in preserving the synchronization be-tween two carriers,their heterodyned spectrum at the receiver IF output is *** measurement methods employ standard equip-ment and have been found to be effective when applied to a multi-carrier millimeter-wave system with over1GHz instantaneous band-width.

关键词： millimeter-wave communication system multiple carrier intermodulation carrier fluctuation synchronization

Protein Interactome Analysis for Countering Pathogen Drug Resistance

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Journal of Computer Science & Technology 2010年第1期25卷 124-130页

作者： Limsoon wong Guimei Liu School of Computing National University of Singapore

Drug-resistant varieties of pathogens are now a recognized global threat. Insights into the routes for drug resistance in these pathogens are critical for developing more effective antibacterial drugs. A systems-level analysis of the genes, proteins, and interactions involved is an important step to gaining such insights. This paper discusses some of the computational challenges that must be surmounted to enable such an analysis; viz., unreliability of bacterial interactome maps, paucity of bacterial interactome maps, and identification of pathways to bacterial drug resistance.

关键词： protein complexes protein interactomes drug resistance infectious diseases

The Weakly Potency of Certain HNN Extensions of Nilpotent Groups

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Algebra Colloquium 2014年第4期21卷 689-696页

作者： K.B. wong P.C. wong Institute of Mathematical Sciences University of Malaya 50603 Kuala Lumpur Malaysia

In this paper we give a characterization for certain HNN extensions oi suogroup separable groups with normal associated subgroups to be weakly potent. We then apply our result to show that certain HNN extensions of fi... 详细信息

关键词： weakly potent HNN extensions subgroup separable finitely generated nilpo-tent groups

Surface-tailoring chlorine resistant materials and strategies for polyamide thin film composite reverse osmosis membranes

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 564-591页

作者： Pei Sean Goh Kar Chun wong Tuck Whye wong Ahmad Fauzi Ismail Advanced Membrane Technology Research Centre(AMTEC) School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310 Johor BahruMalaysia

Polyamide thin film composite membranes have dominated current reverse osmosis market on account of their excellent separation performances compared to the integrally skinned *** their very promising separation performance,chlorine-induced degradation resulted from the susceptibility of polyamide toward chlorine attack has been regarded as the Achilles’s heel of polyamide thin film *** free chlorine species present during chlorine treatment can impair membrane performance through chlorination and depolymerization of the polyamide selective *** material point of view,a chemically stable membrane is crucial for the sustainable application of membrane separation process as it warrants a longer membrane lifespan and reduces the cost involved in membrane *** strategies,particularly those involved membrane material optimization and surface modifications,have been established to address this *** review discusses membrane degradation by free chlorine attack and its correlation with the surface chemistry of *** advancement in the development of chlorine resistant polyamide thin film composite membranes is reviewed based on the state-of-the-art surface modifications and tailoring approaches which include the in situ and postfabrication membrane modifications using a broad range of functional *** challenges and future directions in this field are also highlighted.

关键词： reverse osmosis polyamide thin film composite membranes chlorine resistance surface modification

Repurposing metformin for the treatment of gastrointestinal cancer

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World Journal of Gastroenterology 2021年第17期27卷 1883-1904页

作者： ademar Dantas Cunha Júnior Arinilda Campos Bragagnoli Felipe Osório Costa JoséBarreto Campello Carvalheira Department of Internal Medicine Division of OncologyUniversity of Campinas(UNICAMP)Campinas 13083-970São PauloBrazil Division of Oncology Hospital de Câncer de BarretosBarretos 14784-400São PauloBrazil

Diabetes mellitus type 2 and cancer share many risk *** pleiotropic insulin-dependent and insulin-independent effects of metformin might inhibit pathways that are frequently amplified in neoplastic ***,modulation of inflammation,metabolism,and cell cycle arrest are potential therapeutic cancer targets utilized by metformin to boost the anti-cancer effects of *** in vitro and in vivo models have demonstrated the potential of metformin as a chemo-and radiosensitizer,besides its chemopreventive and direct therapeutic activity in digestive system(DS)***,these aspects have been considered in many cancer clinical ***-control and cohort studies and associated meta-analyses have evaluated DS cancer risk and metformin usage,especially in colorectal cancer,pancreatic cancer,and hepatocellular *** clinical studies have demonstrated the protective role of metformin in the risk for DS cancers and survival *** the other hand,the ability of metformin to enhance the actions of chemotherapy for gastric and biliary cancers is yet to be *** article reviews the current findings on the anti-cancer mechanisms of metformin and its apparatus from pre-clinical and ongoing studies in DS malignancies.

关键词： Antidiabetic treatments Gastrointestinal tumors Therapeutic target

Assessing cypermethrin-contaminated soil with three different earthworm test methods

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Journal of Environmental Sciences 2008年第11期20卷 1381-1385页

作者： wong Hang Gi Michelle Laboratory for Conservation and Utilization of Bio-Resource and School of Life Science Yunnan UniversityKunming 650091China

A series of tests (lethal,sublethal,and behavioral) on earthworms were conducted as an eco-assessment of *** this study,the toxicity of cypermethrin-contaminating soil on adult and juvenile earthworms was *** the acute and chronic tests,an avoidance response test was carried *** was shown that the all-round toxicity from cypermethrin was weak on adult *** with adult earthworms,the toxicity of juvenile earthworms from cypermethrin especially chronic toxicity increased...

关键词： earthworms pesticide cypermethrin survival fecundity avoidance response environment disrupting chemicals

Experimental study of path planning problem using EMCOA for a holonomic mobile robot

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1450-1462页

作者： MOHSENI Alireza DUCHAINE Vincent wong Tony Department of System Engineering École de Technologie SupérieureMontreal QC H3C 1K3Canada

In this paper,a comparative study of the path planning problem using evolutionary algorithms,in comparison with classical methods such as the A*algorithm,is presented for a holonomic mobile *** configured navigation system,which consists of the integration of sensors sources,map formatting,global and local path planners,and the base controller,aims to enable the robot to follow the shortest smooth path ***-based mapping is used for scoring paths efficiently,allowing the determination of collision-free trajectories from the initial to the target *** work considers the evolutionary algorithms,the mutated cuckoo optimization algorithm(MCOA)and the genetic algorithm(GA),as a global planner to find the shortest safe path among others.A non-uniform motion coefficient is introduced for MCOA in order to increase the performance of this algorithm.A series of experiments are accomplished and analyzed to confirm the performance of the global planner implemented on a holonomic mobile *** results of the experiments show the capacity of the planner framework with respect to the path planning problem under various obstacle layouts.

关键词： holonomic robot path planning evolutionary algorithm(EA)

Photocatalysis: Preface

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Journal of Environmental Sciences 2017年第10期29卷 1-2页

作者： Po Keung wong The Chinese University of Hong Kong

A recent search of the keyword＂Photocatalysis＂in the CAS Sci Finder？database shows that at least 5,000 articles on this topic have been published each year from 2014 *** is expected that even more articles on this ... 详细信息

关键词： Preface Ti Photocatalysis

Henkel Technologies and Products for China Aerospace

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材料工程 2006年第5期34卷 32-36页

作者： Michael Cichon Helen Wei Li Alex wong Stan Lehmann Raymond wong Henkel Corporation Bay Point California 94565 U.S.A.

Epoxy structural adhesives and composites have been in use for many years for the construction of aerospace vehicles. Henkel provides many epoxy products. Many other resin systems have been evaluated and several, such as imide, phenolic and cyanate ester, have also achieved significant use. Henkel’s newly developed “Epsilon” chemistry demonstrates unique features that benefit application in aerospace structure that use adhesives and composites.

关键词： adhesive composite epsilon matrix resin structure