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ADI-FDTDMethod for Two-Dimensional Transient Electromagnetic Problems

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Communications in Computational Physics 2016年第1期19卷 94-123页

作者： Wanshan Li Yile Zhang yau shu wong Dong Liang School of Mathematics Shandong UniversityJinan 250199P.R.China Department of Mathematical and Statistical Sciences University of AlbertaEdmontonABT6G 2G1Canada Department of Mathematics and Statistics York UniversityTorontoONM3J 1P3Canada

An efficient and accurate numerical scheme is proposed for solving the transverse electric(TE)mode electromagnetic(EM)propagation problemin two-dimensional *** scheme is based on the alternating direction finite-difference time-domain(ADI-FDTD)*** the conventional upward continuation approach for the earth-air interface,an integral formulation for the interface boundary is developed and it is effectively incorporated to the ADI *** and convergence analysis together with an error estimate are *** simulations are carried out to validate the proposed method,and the advantage of the present method over the popular Du-Fort-Frankel scheme is clearly *** of the electromagnetic field propagation in the ground with anomaly further verify the effectiveness of the proposed scheme.

关键词： ADI-FDTD interface boundary stability and convergence analysis

Multi-line code: A low complexity revocable fingerprint template for cancelable biometrics

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Journal of Central South University 2013年第5期20卷 1292-1297页

作者： wong Wei-jing wong Mou-ling Dennis KHO yau-hee Faculty of Engineering Computing and ScienceSwinburne University of Technology(Sarawak Campus)

A low computational cost cancelable fingerprint template, namely the multi-line codes was proposed. The formulation of a single-line code involves the inspection of minutiae distribution along a straight line constructed based on the reference minutia. Multi-line code is introduced to elevate the performance by combining several single-line codes. Experiments were carried out on a few FVC databases. It has been proven that the proposed method yields relatively low computational complexity as compared to existing minutiae distribution-based methods, while preserving the performance. The equal error rate obtained for FVC2002 DB1 is 4.69% in stolen-key case, and the total arithmetic operations utilized are 14 520 additions and zero multiplication.

关键词： cancelable fingerprint template multi-line code single-line code stolen-key case

Acupuncture for olfactory dysfunction in infected COVID-19 patients:Study protocol for a randomized,sham-controlled clinical trial

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Journal of Traditional Chinese Medical Sciences 2023年第1期10卷 118-124页

作者： Linda Lidan Zhong Yiping wong Choryin Leung Chifung Choy Hungwai Cho Alan Yatlun wong Kaming yau Rowena Howwan wong Bacon Fungleung Ng Zhaoxiang Bian School of Chinese Medicine Hong Kong Baptist UniversityHong Kong 999077China Tseung Kwan O Hospital Hong Kong Hospital AuthorityHong Kong 999077China Department of Ear Nose and Throat(ENT)Tseung Kwan O HospitalHong Kong 999077China Haven of Hope Chinese University of Hong Kong Chinese Medicine Clinic Cum Training and Research Centre(Sai Kung District)Hong Kong 999077China Chinese Medicine Department Hong Kong Hospital AuthorityHong Kong 999077China

Background:Olfactory dysfunction(OD)is a common symptom of Corona Virus Disease 2019(COVID-19).It is defined as the reduced or distorted ability to smell during sniffing(orthonasal olfaction)and represents one of the early symptoms in the clinical course of COVID-19 infection.A large online questionnaire-based survey has shown that some post-COVID-19 patients had no improvement 1 month after discharge from the ***:To explore the efficacy of acupuncture for OD in COVID-19 infected patients and to determine whether acupuncture could have benefits over sham acupuncture for OD in post-COVID-19 ***:This is a single-blind,randomized controlled,cross-over *** plan to recruit 40 post-COVID-19 patients with smell loss or smell distortions lasting for more than 1 *** patients will be randomly allocated to the intervention group(real acupuncture)or the control group(sham acupuncture)at a 1:1 *** patient will receive 8 sessions of treatment over 4 weeks(Cycle 1)and a 2-week *** the follow-up,the control group will be subjected to real acupuncture for another 4 weeks(Cycle 2),and the real acupuncture group will undergo the 4-week sham *** primary outcomes will be the score changes on the questionnaire of olfactory functioning and olfaction-related quality of life at week 6,8,12,and 14 from the *** secondary outcomes will be the changes in the olfactory test score at week 6 and 12 from the baseline measured by using the Traditional Chinese version of the University of Pennsylvania Smell Identification Test(UPSIT-TC).Discussion:The results of this trial will help to determine the effectiveness of acupuncture for OD in post-COVID-19 *** may provide a new treatment option for patients.

关键词： Olfactory dysfunction Smell loss Smell distortions COVID-19 Acupuncture Chinese medicine UPSIT

Agreement of angle closure assessments between gonioscopy, anterior segment optical coherence tomography and spectral domain optical coherence tomography

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 342-346页

作者： Elton Lik Tong Tay Vernon Khet yau Yong Boon Ang Lim Stelson Sia Elizabeth Poh Ying wong Leonard Wei Leon Yip Department of Ophthalmology Tan Tock Seng Hospital Republic of Singapore Air Force Aeromedical Centre Cardinal Santos Medical Center

AIM: To determine angle closure agreements between gonioscopy and anterior segment optical coherence tomography(AS-OCT), as well as gonioscopy and spectral domain OCT(SD-OCT). A secondary objective was to quantify inter-observer agreements of AS-OCT and SD-OCT ***: Seventeen consecutive subjects(33 eyes)were recruited from the study hospital’s Glaucoma *** was performed by a glaucomatologist masked to OCT results. OCT images were read independently by 2 other glaucomatologists masked to gonioscopy findings as well as each other’s analyses of OCT ***: Totally 84.8% and 45.5% of scleral spurs were visualized in AS-OCT and SD-OCT images respectively(P <0.01). The agreement for angle closure between AS-OCT and gonioscopy was fair at k =0.31(95% confidence interval, CI: 0.03-0.59) and k =0.35(95%CI: 0.07-0.63) for reader 1 and 2 respectively. The agreement for angle closure between SD-OCT and gonioscopy was fair at k =0.21(95% CI: 0.07-0.49) and slight at k =0.17(95% CI: 0.08-0.42) for reader 1 and 2 respectively. The inter-reader agreement for angle closure in AS-OCT images was moderate at 0.51(95% CI: 0.13-0.88). The inter-reader agreement for angle closure in SD-OCT images was slight at 0.18(95% CI: 0.08-0.45).CONCLUSION: Significant proportion of scleral spurs were not visualised with SD-OCT imaging resulting in weaker inter-reader agreements. Identifying other angle landmarks in SD-OCT images will allow more consistent angle closure assessments. Gonioscopy and OCT imaging do not always agree in angle closure assessments but have their own advantages, and should be used together and not exclusively.

关键词： anterior segment imaging spectral domain imaging angle closure assessment

Colon cancer in a patient with underlying aplastic anemia: A clinical challenge

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World Journal of Clinical Oncology 2012年第2期3卷 29-31页

作者： Hilda wong Pierre Chan Thomas yau Department of Medicine Queen Mary Hospital Department of Medicine Ruttonjee Hospital Department of Surgery Queen Mary Hospital Centre for Cancer Research The University of Hong Kong

The association of gastrointestinal malignancy with aplastic anemia has rarely been reported in the literature. Although it is not clear whether there is any direct relationship between aplastic anemia and gastrointestinal cancers, a retrospective analysis did suggest the notion that patients with aplastic anemia might have a higher incidence of colorectal cancer. Here, we report the diagnostic and therapeutic challenges in managing a patient with aplastic anemia and advanced colorectal cancer. Early diagnosis is challenging due to overlapping symptomatology and clinical features, increased risk of diagnostic procedures, and confounding complications arising from aplastic anemia and its treatment. A high index of suspicion and multidisciplinary input are essential.

关键词： Aplastic anemia Colon cancer Gastrointestinal malignancy

Intravenous fluid selection rationales in acute clinical management

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World Journal of Emergency Medicine 2018年第1期9卷 13-19页

作者： Wing Yan Shirley Cheung Wai Kwan Cheung Chun Ho Lam Yeuk Wai Chan Hau Ching Chow Ka Lok Cheng yau Hang wong Chak Wah Kam Accident and Emergency Department Tuen Mun Hospital

BACKGROUND: Intravenous fluid(IVF) is commonly used in acute clinical management. This study aimed to review the choice and primary considerations in IVF prescriptions and to evaluate the adequacy of guidelines and trainings on it in the New Territories West Cluster(NTWC) of Hong ***: This is a descriptive study based on data collected from an online survey. Data were processed by SPSS for statistical analysis. This study focused on a general description and doctor-nurse between group comparison. Participants were asked the choice of IVF for nine acute clinical scenarios and provide reason. A 1–10 scale was used to assess the sufficiency of guideline, training and information, and time for revision on IVF ***: 0.9% sodium chloride was the most familiar IVF(36%), followed by 5% Dextrose solution(26%). In the nine scenarios, the most chosen IVF was 0.9% sodium chloride(37%–61%). There was significant difference in the choice of IVF between doctors and nurses in 7 cases. The second most chosen IVF for doctors was Plasma-Lyte A while that for nurses was Gelofusine. Departmental practice was the most chosen reason to account for the prescription. The adequacy of guideline, information and training, and time for revision was rated 5. Doctors had significantly more time at work than nurses to update knowledge in IVF prescription(5.41 versus 4.57).CONCLUSION: 0.9% sodium chloride was mostly chosen. The choice of IVF was mainly based on departmental practice. Adequacy of guideline, information and training, and time for revision on IVF prescription were average, indicating significant training deficit.

关键词： Intravenous fluid Acute care Resuscitation

Range of Motion of Standard and High-Flexion Posterior Stabilized Total Knee Prosthesis

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Range of Motion of Standard and High-Flexion Posterior Stabi...

Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring

中华医学会第八届骨科学术会议暨第一届国际COA学术大会

作者： Ng FY wong HL yau WP Chiu KY Department of Orthopaedics and Traumatology Queen Mary HospitalHKSAR Department of Orthopaedics and Traumatology Tuen Mun HospitalHKSAR

＜正＞Background: The purpose of the study was to compare the ranges of motion associated with standard and high -flexion posterior stabilized total knee prostheses managed with consecutive bilateral total knee arthro...

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再生工程(英文) 2023年第1期4卷 36-43页

作者： Derek Ka-Hei Lai Li-Wen Zha Tommy yau-Nam Leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo-Jung Lim Daphne Sze Ki Cheung Duo Wai-Chi wong James Chung-Wai Cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

Sleep posture monitoring is an essential assessment for obstructive sleep apnea(OSA)*** objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar *** collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients performing four sleep postures(supine,left and right lateral,and prone).We proposed and evaluated deep learning approaches that streamlined feature extraction and classification,and the traditional machine learning approaches that involved different combinations of feature extractors and *** results showed that the dual radar system performed better than either single *** statistical features with random forest classifier yielded the best accuracy(0.887),which could be further improved via an ablation study(0.938).Deep learning approach using transformer yielded accuracy of 0.713.

关键词： Obstructive sleep apnea Deep learning Sleep monitoring Feature extraction Ablation study

On a non-abelian invariant on complex surfaces of general type Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

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Science China Mathematics 2006年第12期49卷 1897-1900页

作者： CHEUNG Wing-Sum wong Bun Department of Mathematics University of Hong Kong Department of Mathematics University of California at Riverside

In this paper,we give certain homotopy and diffeomorphism versions as a generalization to an earlier result due to ***,Bun wong and Stephen *** concerning a local rigidity problem of the tangent bundle over compact su... 详细信息

关键词： Chern numbers complex surfaces of general type coholomogy group local moduli local deformation space Miyaoka-yau inequality yau's global rigidity theorem yau's uniformization theorem.