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Fast numerical generation and hybrid encryption of a computer-generated Fresnel holographic video sequence

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Chinese Optics Letters 2013年第2期11卷 27-31页

作者： peter tsang K.W.-K. Cheung T.-C. Poon Department of Electronic Engineering City University of Hong KongTat Chee AvenueKowloon Bradley Department of Electrical and Computer Engineering Virginia TechUSA Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Research demonstrates that a Fresnel hologram can be generated and simultaneously encrypted numerically based on a secret symmetric key formed by the maximal length sequence （M-sequence）. The method can be directly extended to encrypt a video holographic clip in a frame-by-frame manner. However, given the limited combination of signals in the family of M-sequence, hacking the secret key through trial and error can be time consuming but not difficult. In this letter, we propose a method that is difficult to crack with brute force for enerypting a holographic video sequence. An M-sequence is first randomly assigned to enerypt each frame of the holographic video signal. Subsequently, the index of the selected M-sequence, which is necessary to decrypt the hologram~ is encrypted with the RSA algorithm before transmitting to the receiving end. At the receiving end, the decoder is provided with a private key to recover the index for each frame, and the corresDonding M-se（mence is used to decrvDt the encoded hologram.

关键词： Access control Computer generated holography Cryptography Personal computing Video recording

褪黑色素能抑制口腔内Candida parapsilosis生物膜的形成过程

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褪黑色素能抑制口腔内Candida parapsilosis生物膜的形成过程

Candida albicans aspects of binary titanium alloys for biomedical applications

中华口腔医学会口腔修复学专业委员会第十次全国口腔修复学术大会

作者：杨海萍 peter Chiu-Shun tsang Edmond Ho-Nang POW Otto Lok-Tao LAM Paul Wai-Kei tsang 浙江大学医学院附属口腔医院香港大学牙学院

目的:体外研究褪黑色素对于口腔内Candida parapsilosis生物膜的形成过程的影响方法:体外培养Candida parapsilosis生物膜,将不同浓度的褪黑色素分别加入到生物膜的形成阶段和成熟阶段,最后通过XTT方法来检测生物膜的活性。

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Regenerative Biomaterials 2020年第2期7卷 213-220页

作者： Shuyang Chen James K.H.Tsoi peter C.S.tsang Yeong-Joon Park Ho-Jun Song Jukka P.Matinlinna Dental Materials Science Division of Applied Oral Sciences&Community Dental CareFaculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China Department of Prosthodontics Tianjin Stomatological HospitalNo.75Dagu RoadHeping DistrictTianjin 300041People’s Republic of China Division of Restorative Dental Sciences Faculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China and 4 Department of Dental Materials and MRC for Hard-tissue Biointerface School of DentistryChonnam National UniversityGwangju 61186Republic of Korea

Titanium and its alloys are widely used in biomedical devices,***,due to its biocompati-bility and osseointegration *** fact,fungal(Candida spp.)infection has been identified as one of the key reasons causing the failure of the device that is inevitable and impactful to the ***,this study evaluated the surface morphology,surface chemical composition and Candida albicans adhesion on specimens of 16 binary Tialloys(-5 wt%of any one of the alloy elements:Ag,AI,Au,Co,Cr,Cu,Fe,In,Mn,Mo,Nb,Pd,Pt,Sn,V and Zr)compared with cp-Ti,targeting to seek for the binary Ti-alloys which has the lowest *** *** albicans cultures were grown on the specimens for 48 h,and colony forming units(CFUs)and real-time polymerase chain reaction(RT-PCR)were used to evaluate the biofilm formation *** electron mi-croscopy and confocal laser scanning microscopy confirmed the formation of *** biofilm on all specimens'surfaces,such that CFU results showed Ti-Mo,Ti-Zr,Ti-AI and Ti-V have less *** formed on the surfaces than ***-PCR showed Ti-Zr and Ti-Cu have significantly higher *** DNA concentrations than Ti-AI and Ti-V(P<0.05),whereas Ti-Cu has even showed a statistically higher concentration than Ti-Au,Ti-Co,Ti-In and Ti-Pt(P<0.05).This study confirmed that Ti-Mo,Ti-Zr,Ti-AI and Ti-V have lower the occurrence of *** which might be clinically advantageous for medical devices,but Ti-Cu should be used in caution.

关键词： titanium binary titanium alloy C.albicans,fungal infection medical devices

Leaching from Heterogeneous Heck Catalysts:A Computational Approach

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Chemical Research in Chinese Universities 2002年第2期18卷 175-177页

作者： peter. M. Jenkins and Shik Chi tsang Surface Science and Catalysis Research Centre, Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK Surface Science and Catalysis Research Centre Department of Chemistry University of Reading Whiteknights 英国 Reading

The possibility of carrying out a purely heterogeneous Heck reaction in practice without Pd leaching has been previously considered by a number of research groups but no general consent has yet arrived. Here, the reaction was, for the first time, evaluated by a simple computational approach. Modelling experiments were performed on one of the initial catalytic steps: phenyl halides attachment on Pd (111) to (100) and (111) to (111) ridges of a Pd crystal. Three surface structures of resulting were identified as possible reactive intermediates. Following potential energy minimisation calculations based on a universal force field, the relative stabilities of these surface species were then determined. Results showed the most stable species to be one in which a Pd ridge atom is removed from the Pd crystal structure, suggesting Pd leaching induced by phenyl halides is energetically favourable.

关键词： Heterogeneous Heck reaction, Aryl halides, Computational Modelling Leaching of palladium

Superior antibody and membrane protein‑specific T‑cell responses to CoronaVac by intradermal versus intramuscular routes in adolescents

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World Journal of Pediatrics 2024年第4期20卷 353-370页

作者： Jaime S.Rosa Duque Samuel M.S.Cheng Carolyn A.Cohen Daniel Leung Xiwei Wang Xiaofeng Mu Yuet Chung Tsun Ming Lau Manni Wang Wenyue Zhang Yanmei Zhang Howard H.W.Wong Leo C.H.tsang Sara Chaothai Tsz Chun Kwan John K.C.Li Karl C.K.Chan Leo L.H.Luk Jenson C.H.Ho Wing Yan Li Amos M.T.Lee Jennifer H.Y.Lam Sau Man Chan Wilfred H.S.Wong Issan Y.S.Tam Masashi Mori Sophie A.Valkenburg Malik Peiris Wenwei Tu Yu Lung Lau Department of Paediatrics and Adolescent Medicine The University of Hong KongHong KongChina School of Public Health The University of Hong KongHong KongChina HKU‑Pasteur Research Pole School of Public HealthThe University of Hong KongHong KongChina Research Institute for Bioresources and Biotechnology Ishikawa Prefectural UniversityNonoichiJapan Department of Microbiology and Immunology Peter Doherty Institute for Infectionand ImmunityUniversity of MelbourneMelbourneVICAustralia Center for Immunology and Infection C2i Hong KongChina

Background Optimising the immunogenicity of COVID-19 vaccines to improve their protection against disease is *** dosing by intradermal(ID)administration has been shown to be equally immunogenic as intramuscular(IM)administration for several vaccines,but the immunogenicity of ID inactivated whole severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)at the full dose is *** study(NCT04800133)investigated the superiority of antibody and T-cell responses of full-dose CoronaVac by ID over IM administration in *** Participants aged 11–17 years received two doses of IM or ID vaccine,followed by the 3rd dose 13–42 days *** and cellular immunogenicity outcomes were measured post-dose 2(IM-CC versus ID-CC)and post-dose 3(IMCCC versus ID-CCC).Doses 2 and 3 were administered to 173 and 104 adolescents,*** Spike protein(S)immunoglobulin G(IgG),S-receptor-binding domain(RBD)IgG,S IgG Fcγreceptor IIIa(FcγRIIIa)-binding,SNM[sum of individual(S),nucleocapsid protein(N),and membrane protein(M)peptide pool]-specific interleukin-2(IL-2)+CD4^(+),SNM-specific IL-2^(+)CD8^(+),S-specific IL-2^(+)CD8^(+),N-specific IL-2^(+)CD4^(+),N-specific IL-2^(+)CD8^(+)and M-specific IL-2^(+)CD4^(+)responses fulfilled the superior and non-inferior criteria for ID-CC compared to IM-CC,whereas IgG avidity was *** ID-CCC,S-RBD IgG,surrogate virus neutralisation test,90%plaque reduction neutralisation titre(PRNT90),PRNT50,S IgG avidity,S IgG FcγRIIIa-binding,M-specific IL-2^(+)CD4^(+),interferon-γ+CD8^(+)and IL-2^(+)CD8^(+)responses were superior and non-inferior to *** estimated vaccine efficacies were 49%,52%,66%and 79%for IM-CC,ID-CC,IM-CCC and ID-CCC,*** ID groups reported more local,mild adverse *** This is the first study to demonstrate superior antibody and M-specific T-cell responses by ID inactivated SARSCoV-2 vaccination and serves as the basis for future research to improve the

关键词： CoronaVac Coronavirus disease 2019 Immunity Intradermal Vaccine

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Design

明日风尚 2010年第2期 122-123页

作者： Carrie tsang

01洞穴大宅〉得益于建筑大师peter Zumthor打造的温泉建筑,令Vals这个瑞士阿尔卑斯山脉上人口只有一千的寻常小镇广为人知。该镇最近又增添另一个地标式建筑——一幢以椭圆形为设计核心的住宅Villa Vals,身处其中时能饱览瑞士怡人景致,... 详细信息

01洞穴大宅〉得益于建筑大师peter Zumthor打造的温泉建筑,令Vals这个瑞士阿尔卑斯山脉上人口只有一千的寻常小镇广为人知。该镇最近又增添另一个地标式建筑——一幢以椭圆形为设计核心的住宅Villa Vals,身处其中时能饱览瑞士怡人景致,阳光亦能照亮每个角落,屋底更有一条长逾22米的地下隧道,通往著名景点Graubunder Barn。这个丝毫看不出是住宅的新设计,特色是和自然环境融合为一的建筑结构。坐落山脚,全屋布局俱顺着山势而建,远眺像是一处藏身于山洞的神秘地域。***.

关键词：建筑大师建筑结构 Design 大宅折线形公共空间功能块推拉门甲洲冰铜

Contemporary solutions for patients with microtia and congenital aural atresia-Hong Kong experience

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Journal of Otology 2016年第4期11卷 -页

作者： Willis S.S.tsang Michael C.F.Tong peter K.M.Ku Kunwar S.S.Bhatia Joannie K.Y.Yu Terence K.C.Wong C.Andrew van Hasselt Department of Otorhinolaryngology Head and Neck Surgery The Chinese University of Hong Kong Prince of Wales Hospital Department of Imaging & Interventional Radiology The Chinese University of Hong Kong Prince of Wales Hospital

Managing microtia patients is always a challenge. Multidisciplinary approach, good family support, well established doctorepatient rela-tionship and well organised patient-support groups are the essential elements for success. With the advancement of implantable hearing devices, more options will be available for the microtia patients. Otologists play a leading role in the whole management process. They not only provide proper guidance to the patients in choosing the correct path of the treatment, but also play a key role in organising and maintaining a cost-effective multidisciplinary rehabilitation team for the microtia patients.

关键词： Microtia Congenital aural atresia Implantable hearing aids Bone conduction

Effects of a Single-Dose of Mind-Body Practice on the Heart Rate Variability, Brain Activity and Shooting Performance in Archers: A Pilot Study

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Yangtze Medicine 2019年第2期3卷 124-134页

作者： peter X. L. Li Chung S. C. Chan Kenneth K. Y. Lai Jennifer P. C. Wong William W. N. tsang Medical School Yangtze University Jingzhou China Department of Rehabilitation Sciences The Hong Kong Polytechnic University Hong Kong China

Objective: Factors affecting performance of archery are categorized into psychological, skill, and fitness perspectives. Increase in attention, relaxation and parasympathetic system activity is believed to enhance the shooting performance of archers during competition. This pilot study aims to investigate the effects of single-dose of Tai Chi practice on archer’s performance and the feasibility of an investigation protocol under a competition scenario. Methods: This was a randomized controlled trial (RCT) with a crossover study design. Pre- and post-intervention measurements were conducted to evaluate the effects of Tai Chi practice on the archer’s autonomic nervous system activity, attention and relaxation through electroencephalography investigation, and shooting performance when compared with stretching as control. Results: The protocol of the study was found to be feasible during a competition setting. No significant difference was detected in the outcome measures under the two intervention conditions. Participants after practicing Tai Chi were found to improve significantly in their shooting performance (p = 0.021). Conclusion: This pilot study showed that a real-time measurement of autonomic nervous system and brain wave activities in the competition field was feasible and it did not hinder the archers’ performance. There was a significant improvement observed in the shooting performance of archers after Tai Chi practice when compared with baseline. The findings of this pilot study provide the basis for the conduction of a larger RCT study to examine the potential beneficial effects of Tai Chi practice on archers.

关键词： Mind-Body Autonomic Nervous System Brain Waves Archery

A Distributed Multimedia Conferencing System

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A Distributed Multimedia Conferencing System