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Reassessing the contributions of terrestrial waters to sea level variations in the South China Sea and its response to alternating ENSO events

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Science China Earth Sciences 2024年第7期67卷 2253-2267页

作者： pengfei YANG hok Sum FOK Zhongtian MA MOE Key Laboratory of Geospace Environment and Geodesy&MNR Key Laboratory of Geophysical Geodesy School of Geodesy and GeomaticsWuhan UniversityWuhan 430079China Hubei Luojia Laboratory Wuhan 730079China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong 999077China

Regional sea level variability is linked to regional terrestrial water and the El Ni?o-Southern Oscillation(ENSO).This study assessed the relationships between the sea level variations in the South China Sea(SCS)and ENSO,the impact of terrestrial water storage(TWS)on non-steric sea level(NSSL),and the contributions of steric sea level(SSL)and NSSL to sea level anomaly(SLA),*** 2003 to 2015,the SLAs exhibited a long-term trend of 6.65±0.78 mm/yr,which was primarily attributed to the ***,during 2003-2015,ENSO events alternating with varying intensities might also be responsible for the unusually high SLA *** to the SSLs,the NSSLs contributed the seasonal signals to the SLAs,while the NSSLs changes were largely explained by the TWS in the Mekong River Basin at the seasonal scale and in the pearl River Basin and Red River Basin at other time *** contrast to the TWS,the contributions of precipitation and evapotranspiration were relatively minor.A negative correlation between the sea level variations and ENSO was also found,with cross-correlation coefficients between the oceanic Ni?o index and SLAs/SSLs/NSSLs of -0.36/-0.37/-0.62 with lags of 2/3/2 months,*** findings systematically reassessed the contributions of different components to the sea level *** study provided a benchmark for in-depth analysis of the impacts of terrestrial water and other potential causes on sea level rise in the SCS.

关键词： South China Sea Sea level variations Terrestrial water storage ENSO

A Two-Stage Color Image Segmentation Method Based on Saturation-Value Total Variation

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Advances in Applied Mathematics and Mechanics 2023年第1期15卷 94-117页

作者： Tiange Wang hok Shing Wong Department of Mathematics The Chinese University of Hong KongHong Kong

Color image segmentation is crucial in image processing and computer *** traditional segmentation methods simply regard an RGB color image as the direct combination of the three monochrome images and ignore the inherent color structures within channels,which contain some key feature information of the *** better describe the relationship of color channels,we introduce a quaternion-based regularization that can reflect the image characteristics more *** model combines the idea of the Mumford-Shah model-based two-stage segmentation method and the Saturation-Value Total Variation regularization for color image *** new strategy first extracts features from the color image and then subdivides the image in a new color feature space which achieves better performance than methods in RGB color ***,to accelerate the optimization process,we use a new primal-dual algorithm to solve our novel *** results demonstrate clearly that the performance of our proposed method is excellent.

关键词： Color space pure quaternion image segmentation total variation primal-dual algorithm

Alcoholic ketoacidosis in two Chinese patients

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Chinese Medical Journal 2000年第11期113卷 91-93页

作者： Rossa WKChiu hok-Leung Tai and Ching-Wan Lam DepartmentofChemicalpathology TheChineseUniversityofHongKongPrinceofWalesHospitalHongKongChinaDepartmentofChemicalPathologyTheChineseUniversityofHongKongPrinceofWalesHospitalHongKongChina

Incorporating the Maximum Entropy on the Mean Framework with Kernel Error for Robust Non-Blind Image Deblurring

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Communications in Computational physics 2022年第3期31卷 893-912页

作者： hok Shing Wong Hao Zhang Lihua Li Tieyong Zeng Yingying Fang Department of Mathematics The Chinese University of Hong KongHong Kong College of Life Information Science and Instrument Engineering Hangzhou Dianzi UniversityHangzhouChina

Non-blind deblurring is crucial in image *** most previous works assume that the exact blurring kernel is known,this is often not the case in *** blurring kernel is most likely estimated by a blind deblurring method and is not *** this work,we incorporate a kernel error term into an advanced non-blind deblurring method to recover the clear image with an inaccurately estimated *** on the celebrated principle of Maximum Entropy on the Mean(MEM),the regularization at the level of the probability distribution of images is carefully com-bined with the classical total variation regularizer at the level of image/***-sive experiments show clearly the effectiveness of the proposed method in the pres-ence of kernel *** a traditional method,the proposed method is even better than some of the state-of-the-art deep-learning-based *** also demonstrate the potential of combining the MEM framework with classical regularization approaches in image deblurring,which is extremely inspiring for other related works.

关键词： Image deblurring total variation KL divergence error kernel

Dietary analysis of the House Swift(Apus nipalensis)in Hong Kong using prey DNA in faecal samples

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Avian Research 2021年第1期12卷 86-101页

作者： Chun Ting Chung hok Sze Wong Man Long Kwok Qi Meng King Ming Chan School of Life Sciences The Chinese University of Hong KongSha Tin 999077N.TChina Swift and Swallow Research Group The Hong Kong Bird Watching Society7CV Ga Building532 Castle Peak RoadLai Chi KokKowloonHong Kong 999077China

Background:To understand the dietary composition of the highly aerial swift(Apodidae),ecologists conventionally depend on the morphological identification of prey items from food boluses or stomach contents,but these techniques are often invasive,require expertise in identification,and often cannot produce accurate identifications at the species ***:DNA barcoding was used to analyse the dietary composition of House Swifts(Apus nipalensis)in Hong Kong,*** samples from five different colonial nest sites were collected between 2019 and *** used universal primers to amplify a region of the cytochrome C oxidase gene from prey DNA in the faecal samples for identification ***:Ten different orders and 44 families from three different classes of Arthropoda were identified in the collected faecal ***,Hemiptera and Diptera were the most prevalent groups of prey found in the *** in the dietary composition of House Swifts during the breeding(April to September)and nonbreeding(October to March)season were also ***,particularly ants(Formicidae),were predominant in the diet during the breeding season,whereas Diptera and Hemiptera were predominant during the non-breeding ***:The prey groups identified in this study were similar to those identified in a previous study of the diet of House Swift,which also suggests a possible role of House Swifts in reducing the numbers of local insect *** study demonstrates the usefulness of applying molecular tools for the dietary analysis of aerial *** local forested areas may be crucial for the maintenance of House Swift population.

关键词： Diet DNA barcoding House swift Urbanisation threat

Saturation-Value Blind Color Image Deblurring with Geometric Spatial-Feature prior

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Communications in Computational physics 2023年第3期33卷 795-823页

作者： Hao Zhang Yingying Fang hok Shing Wong Lihua Li Tieyong Zeng Department of Mathematics The Chinese University of Hong KongHong Kong National Heart and Lung Institute Imperial College LondonLondonUnited Kingdom College of Life Information Science and Instrument Engineering Hangzhou Dianzi UniversityHangzhouChina.

Blind deblurring for color images has long been a challenging computer vision *** intrinsic color structures within image channels have typically been disregarded in many excellent *** investigate employing regularizations in the hue,saturation,and value(HSV)color space via the quaternion framework in order to better retain the internal relationship among the multiple channels and reduce color distortions and color *** observe that a geometric spatial-feature prior utilized in the intermediate latent image successfully enhances the kernel accuracy for the blind deblurring variational models,preserving the salient edges while decreasing the unfavorable *** by this,we develop a saturation-value geometric spatial-feature prior in the HSV color space via the quaternion framework for blind color image deblurring,which facilitates blur kernel *** alternating optimization strategy combined with a primal-dual projected gradient method can effectively solve this novel proposed *** experimental results show that our model outperforms state-of-the-art methods in blind color image deblurring by a wide margin,demonstrating the effectiveness of the proposed model.

关键词： Blind color image deblurring quaternion geometric spatial-feature prior color space

Value of gastrografin in adhesive small bowel obstruction after unsuccessful conservative treatment: A prospective evaluation

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World Journal of Gastroenterology 2005年第24期11卷 3742-3745页

作者： hok-Kwok Choi Wai-Lun Law Judy Wai-Chu Ho Kin-Wah Chu Department of Surgery

AIM: Gastrografin is a hyperosmolar water-soluble contrast medium. Besides its predictive value for the need for operative treatment, a potential therapeutic role of this agent in adhesive small bowel obstruction has been suggested. This study aimed at evaluating the effectiveness of gastrografin in adhesive small bowel obstruction when conservative treatment failed. METHODS: patients with adhesive small bowel obstruction were given trial conservative treatment unless there was fear of bowel strangulation. Those responded in the initial 48 h had conservative treatment continued. patients who showed no improvement in the initial 48 h were given 100 mL of gastrografin through nasogastric tube followed by serial abdominal radiographs. patients with the contrast appeared in large bowel within 24 h were regarded as having partial obstruction and conservative treatment was continued. patients in which the contrast failed to reach large bowel within 24 h were considered to have complete obstruction and laparotomy was performed. RESULTS: Two hundred and twelve patients with 245 episodes of adhesive obstruction were included. Fifteen patients were operated on soon after admission due to fear of strangulation. One hundred and eighty-six episodes of obstruction showed improvement in the initial 48 h and conservative treatment was continued. Two patients had subsequent operations because of persistent obstruction. Forty-four episodes of obstruction showed no improvement within 48 h and gastrografin was administered. Seven patients underwent complete obstruction surgery. partial obstruction was demonstrated in 37 other cases, obstruction resolved subsequently in all of them except one patient who required laparotomy because of persistent obstruction. The overall operative rate in this study was 10%. There was no complication that could be attributed to the use of gastrografin. CONCLUSION: The use of gastrografin in adhesive small bowel obstruction after unsuccessful conservative

关键词： Gastrografin Adhesions Intestinal obstruction

A Thomistic paradigm for planning Conflict Resolution

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China City planning Review 2013年第4期22卷 8-18页

作者： hok-Lin Leung School of Urban and Regional planning Queen’s University

Thomas Aquinas' s concept of natural law propounds two universal values: self-preservation and living-with-others. They are equal and symmetrical in any specif ic social relationship. Living-with-others is the most reliable guarantee for self-preservation; self-preservation provides the best standard for living-with-others. This opens up new opportunities for resolving confl icts between the developer and objector in land development.

关键词： confl ict resolution natural law Western philosophy

A SURGERY REpRESENTATION OF 3-DIMENSIONAL HOMOLOGY SpHERES

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Chinese Annals of Mathematics,Series B 1997年第4期18卷 435-438页

作者： ZHOU QING Institute of Mathematics,East China Normal University,Shanghai 200062,China project supported by the National Natural Science Foundation of China SEDC and the hok Ying Tong Eduction Foundation. Institute of Mathematics East China Normal University Shanghai 200062 China

It is proved that for any 3 dimensional homology sphere M, there is a sequence of homology spheres M 0, M 1,…, M s such that M 0=S 3, M s=M and each M i is a result of ±1 surgery of M i... 详细信息

关键词： dimensional homology sphere Surgery Knot