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System Integration in Radiation Oncology Through Networking

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临床医学工程 1998年第3期 107-110页

作者： K.y.cheung Ricky Chau Peter Choi Departmen of Clinical Oncology Hong Kong Prince of Wales Hospital

This paper presents the basic system design and our initial experience on the operation and performance of a fully integrated radiotherapy treatment planning, treatment delivery and patient management network system at the Prince of Wales Hostpital, Hong Kong, The aim of the project is to establish a suitable tool for easy and reliable implementation of routine conformal radiotherapy and to improve the effciency and quality of radiotherapy service through system integration

关键词： In System Integration in Radiation Oncology Through Networking 加心比切

Ophthalmology in the time of COVID-19: experience from Hong Kong Eye Hospital

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International Journal of Ophthalmology(English edition) 2020年第6期13卷 851-859页

作者： Stephanie S.L.cheung Cherie y.K.Wong Jason C.K.Chan Carmen K.M.Chan N.M.Lam Hunter K.L.yuen Victoria W.y.Wong Chi Wai Tsang Clement C.y.Tham Department of Ophthalmology and Visual Sciences the Chinese University of Hong KongHong Kong SARChina Hong Kong Eye Hospital Hong Kong SARChina

AIM:To review international guidelines and to share our infection control experience during the coronavirus disease 2019(COVID-19)pandemic at a tertiary eye centre in Hong ***:Infection control guidelines and recommendations from international ophthalmological bodies are reviewed and *** measures at our hospital were drawn up as per international and local health authorities’guidelines and implemented with the collaboration of doctors,nurses and administrative ***:The aims of our infection control measures are to 1)minimize cross-infection within the hospital;2)protect and support hospital staff;3)ensure environmental *** minimize the risk of cross-infection,outpatient attendance and elective surgery have been reduced by 40%,and general anesthesia procedures were reduced by 90%.Patients entering the hospital are screened for fever,travel history,contact and cluster history,and COVID-19 related *** protect and support hospital staff,we ensure provision of adequate personal protective equipment(PPE)and provide clear guidelines on the level of PPE needed,depending on the clinical *** protective measures include provision of work uniforms,easy access to alcohol-based hand rub,opening new lunch areas,implementation of self-monitoring and self-reporting systems,and communication via online education and ***,environmental control is achieved by ensuring regular disinfection of the hospital premise,enhancing ventilation,and usage of disposable ophthalmic ***:Our multi-pronged approach to infection control is,so far,successful in minimizing infection risks,while allowing the maintenance of essential ophthalmic services.

关键词： COVID-19 coronavirus SARS-CoV-2 ophthalmology infection control Hong Kong

ON THE VARIATIONAL PRINCIPLES IN LINEAR ELASTODyNAMICS

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Acta Mechanica Sinica 1988年第4期4卷 337-349页

作者： Luo En (Department of Mechanics,Zhongshan University,Guangzhou)cheung y. K. (Department of Civil and Structural Engineering,University of Hong Kong,Hong Kong) Department of Mechanics Zhongshan University Guangzhou Department of Civil and Structural Engineering University of Hong Kong Hong Kong

A new approach is proposed for the systematic derivation of various variational principles inlinear *** on an important integral relation in terms of convolutions given by the authors,the new approach can be used to derive the complementary functionals for the five-field,four-field,three-field,two-field and one-field variational principles more simply and ***,with thisapproach,it is possible not only to derive the variational principles given by Herrera and Bielak,Oden andReddy,but also to develop new more general variational *** the intrinsic relationship amongvarious principles can be explained clearly.

关键词： variational principle linear elastodynamics initial-value problem combinatorial generalized variational principle

Nucleic acid-based diagnostics for infectious diseases in public health affairs

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Frontiers of Medicine 2012年第2期6卷 173-186页

作者： Albert cheung-Hoi yu Greg Vatcher Xin yue yan Dong Mao Hua Li Patrick H.K.Tam Parker y.L.Tsang April K.y.Wong Michael H.K.Hui Bin yang Hao Tang Lok-Ting Lau Neuroscience Research Institute/Department of Neurobiology School of Basic Medical Sciences/Key Laboratory for NeuroscienceMinistry of Education/Key Laboratory for NeuroscienceMinistry of HealthPeking UniversityBeijing 100191China Hai Kang Life Corporation Limited Hong Kong SARChina and Beijing 100176China

Infectious diseases,mostly caused by bacteria and viruses but also a result of fungal and parasitic infection,have been one of the most important public health concerns throughout human *** first step in combating these pathogens is to get a timely and accurate diagnosis at an affordable *** kinds of diagnostics have been developed,such as pathogen culture,biochemical tests and serological tests,to help detect and fight against the causative agents of ***,these diagnostic tests are generally unsatisfactory because they are not particularly sensitive and specific and are unable to deliver speedy *** acid-based diagnostics,detecting pathogens through the identification of their genomic sequences,have shown promise to overcome the above limitations and become more widely adopted in clinical *** we review some of the most popular nucleic acid-based diagnostics and focus on their adaptability and applicability to routine clinical *** also compare and contrast the characteristics of different types of nucleic acid-based diagnostics.

关键词： nucleic acid-based diagnostics infectious disease PCR NASBA LAMP microarray LOAC public health affairs

Clinically relevant factors associated with quantitative optical coherence tomography angiography metrics in deep capillary plexus in patients with diabetes

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Eye and Vision 2020年第1期7卷 64-74页

作者： Fang yao Tang Erica O.Chan Zihan Sun Raymond Wong Jerry Lok Simon Szeto Jason C.Chan Alexander Lam Clement C.Tham Danny S.Ng Carol y.cheung Department of Ophthalmology and Visual Sciences The Chinese University of Hong KongHong Kong Special Administrative RegionKowloonChina Hong Kong Eye Hospital Hong Kong Special Administrative RegionKowloonChina CUHK Eye Centre Hong Kong Eye Hospital147K Argyle StreetKlnKowloonHong KongChina

Background:To test clinically relevant factors associated with quantitative artifact-free deep capillary plexus(DCP)metrics in patients with diabetes mellitus(DM).Methods:563 eligible eyes(221 with no diabetic retinopathy[DR],135 with mild DR,130 with moderate DR,and 77 with severe DR)from 334 subjects underwent optical coherence tomography-angiography(OCT-A)with a swept-source OCT(Triton DRI-OCT,Topcon,Inc.,Tokyo,Japan).Strict criteria were applied to exclude from analysis those DCP images with artifacts and of poor quality,including projection artifacts,motion artifacts,blurriness,signal loss,B-scan segmentation error,or low-quality score.A customized MATLAB program was then used to quantify DCP morphology from the artifact-free DCP images by calculating three metrics:foveal avascular zone(FAZ),vessel density(VD),and fractal dimension(FD).Results:166(29.5%)eyes were excluded after quality control,leaving in the analysis 397 eyes(170 with no DR,101 with mild DR,90 with moderate DR,36 with severe DR)from 250 *** the multiple regression models,larger FAZ area was associated with more severe DR(β=0.687;p=0.037),shorter axial length(AL)(β=−0.171;p=0.003),thinner subfoveal choroid thickness(β=−0.122;p=0.031),and lower body mass index(BMI)(β=−0.090;p=0.047).Lower VD was associated with more severe DR(β=−0.842;p=0.001),shorter AL(β=0.107;p=0.039),and poorer visual acuity(VA)(β=−0.133;p=0.021).Lower FD was associated with more severe DR(β=−0.891;py,AL,subfoveal choroidal thickness,age,and BMI in diabetic *** effects of ocular and systemic factors should be considered for meaningful interpretations of DCP changes in DM patients.

关键词： Optical coherence tomography angiography Diabetic retinopathy Deep capillary plexus Visual acuity

InP/SiO_2纳米复合膜的微观结构和光学性质

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物理学报 2001年第8期50卷 1574-1579页

作者：丁瑞钦王浩 W.F.LAU W.y.cheung S.P.WONG 王宁娟于英敏广东省五邑大学薄膜与纳米材料研究所江门529020 香港中文大学电子工程系暨材料科技研究中心南开大学光电子薄膜器件与技术研究所天津300071

应用射频磁控共溅射方法在石英玻璃和抛光硅片上制备了InP SiO2 复合薄膜 ,并在几种条件下对这些薄膜进行退火 .X射线光电子能谱和卢瑟福背散射实验结果表明 ,复合薄膜中InP和SiO2 的化学组分都大体上符合化学计量配比 .X射线衍射和激... 详细信息

应用射频磁控共溅射方法在石英玻璃和抛光硅片上制备了InP SiO2 复合薄膜 ,并在几种条件下对这些薄膜进行退火 .X射线光电子能谱和卢瑟福背散射实验结果表明 ,复合薄膜中InP和SiO2 的化学组分都大体上符合化学计量配比 .X射线衍射和激光喇曼谱实验结果都证实了复合薄膜中形成了InP纳米晶粒 .磷气氛保护下的高温(5 2 0℃ )退火可以消除复合薄膜中残存的In和In2 O3 并得到了纯InP SiO2 纳米复合薄膜 .

关键词：纳米晶粒微观结构光学性质纳米复合膜磷化铟

Morphological Changes in the Gills of Tilapia Fed Sterilized and Nonsterilized Sludge

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Biomedical and Environmental Sciences 1989年第2期2卷 81-91页

作者： W.K.LIU M.H.WONG y.H.cheung Department of Anatomy The Chinese University of Hong KongShatinN.T.Hong Kong Department of Biology Hong Kong Baptist College224 Waterloo RoadKowloonHong Kong

The effects of digested sludge on the ultrastructure of gills of Sarotherodon mossambicus were *** of digested sludge were collected from the Shatin Sewage Treatment Plant in Hong Kong *** were (1)sun-dried(NS)or(2)sterilized in an autoclave(SS).They were then used as supplementary fish feed to cultivate the freshwater tilapia,***,for 50 days under laboratory *** SS at low dosage(25%)had the lowest toxicity among different treatments.A swelling of lamellar epithelium,the enlargement of the subepitlaelial space,the collapse of capillaries,and the infiltration of polymorphonuclear cells in the lamellae offish gills were common to fish fed 50 to 100% NS and *** thickening of the basal lamina in the gill lamellae is a common feature found in the sludge-treated fish.1989 Academic ***.

关键词： Morphological Changes in the Gills of Tilapia Fed Sterilized and Nonsterilized Sludge

射频磁控共溅射GaAs/SiO_2纳米颗粒镶嵌薄膜的光学性质

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物理学报 2002年第4期51卷 882-888页

作者：丁瑞钦王浩于英敏王宁娟佘卫龙李润华丘志仁罗莉蔡志岗 W y cheung S P Wong 五邑大学薄膜与纳米材料研究所江门529020 中山大学超快速激光光谱国家重点实验室广州510275 香港中文大学电子工程系暨材料科技研究中心

应用射频磁控共溅射方法和真空退火方法制备了GaAs SiO2 纳米颗粒镶嵌薄膜 .X射线衍射实验结果表明 ,经高温退火的薄膜中形成了面心立方闪锌矿结构的GaAs纳米晶粒 ,晶粒平均直径为 1.5— 3.2nm .吸收光谱展示了由于强量子限域引起的 1.5... 详细信息

应用射频磁控共溅射方法和真空退火方法制备了GaAs SiO2 纳米颗粒镶嵌薄膜 .X射线衍射实验结果表明 ,经高温退火的薄膜中形成了面心立方闪锌矿结构的GaAs纳米晶粒 ,晶粒平均直径为 1.5— 3.2nm .吸收光谱展示了由于强量子限域引起的 1.5— 2eV的吸收边蓝移 .室温光致荧光 (PL)光谱显示了电子重空穴激子与电子劈裂空穴激子的近紫外和紫外双PL谱峰以及深俘获态的PL谱峰 .对实验吸收边蓝移量与有效质量模型的蓝移量的悬殊差别、俘获态PL谱的形成以及PL谱线的特征作了解释 .应用激光Z扫描技术测量了退火温度为 5 0 0℃的复合膜在非共振条件下的光学非线性 ,结果表明 ,复合膜的非线性折射率系数和非线性吸收系数都比块材GaAs相应的系数增大了 5个数量级 .

关键词：射频磁控共溅射 GaAs/SiO2 纳米颗粒镶嵌薄膜光谱激光Z扫描光学性质砷化镓二氧化硅半导体纳米材料

Influence of various gases on the emission of laser generated plume

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Chinese Journal of Lasers 1993年第1期 63-68页

作者： S.C.Chen N.H.cheung Z.y.Wang

We report the experimental results on the investigation of the emission charac teristics of the XeCl laser generated plume from the Copper target in variant gas ambient. The dependence of the emission intensities on the gas pressure are strikingly different among these gases. This behavior is attributed to the difference in ionization of the employed gases.

关键词： excimer laser laser generated plume