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Exploiting structural similarity of log files in fault diagnosis for Web service composition

CAAI Transactions on Intelligence Technology 2016年第1期1卷 61-71页

作者： Xu Han Binyang Li Kam-fai wong Zhongzhi Shi Beijing Key Laboratory of Electronic System Reliability Technology Capital Normal University Beijing China University of International Relations Beijing China Department of Systems Engineering & Engineering Management The Chinese University of Hong Kong Hong Kong China The Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing China

With increasing deployment of Web services, the research on the dependability and availability of Web service composition becomes more and more active. Since unexpected faults of Web service composition may occur in different levels at runtime, log analysis as a typical data- driven approach for fault diagnosis is more applicable and scalable in various architectures. Considering the trend that more and more service logs are represented using XML or JSON format which has good flexibility and interoperability, fault classification problem of semi-structured logs is considered as a challenging issue in this area. However, most existing approaches focus on the log content analysis but ignore the structural information and lead to poor performance. To improve the accuracy of fault classification, we exploit structural similarity of log files and propose a similarity based Bayesian learning approach for semi-structured logs in this paper. Our solution estimates degrees of similarity among structural elements from heterogeneous log data, constructs combined Bayesian network （CBN）, uses similarity based learning algorithm to compute probabilities in CBN, and classifies test log data into most probable fault categories based on the generated CBN. Experimental results show that our approach outperforms other learning approaches on structural log datasets.

关键词： Web services composition Fault diagnosis Combined Bayesian network (CBN) Similarity Probability

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Use of computer-assisted instruction （CAI） in cognitive rehabilitation: Fact or fad

Use of computer-assisted instruction （CAI） in cognitive re...

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第三届全国康复医学青年学术会议

作者： David Wai-kwong Man Alan Sing-fai,Tam Department of Rehabilitation Sciences The Hong Kong Polytechnic University Hong Kong SARPRC Department of Rehabilitation Sciences The Hong Kong Polytechnic University Hong Kong SARPRC

＜正＞Recent advances in technology permit the disabled to use computers as one of their personal assistive aids in daily functional activities. Many rehabilitation organisations or professionals have adopted specialised computer - related treatment for their clients. However, to date, little evidence is available on the effectiveness of various approaches to the computer training for the disabled. The present study was designed to perform theory driven empirical work that contributes a better under- standing of effects using different memory retraining strategies for persons with brain injury. The present research project attempted to develop and evaluate computer applications for memory retraining. The study also investigated usability and effectiveness of applying computer technology in cognitive rehabilitation. Eighteen persons with brain injury participated in 3 study groups. Six of them participated in each of the three computer -assisted memory retraining that adopted different strategy. The subjects’ progress and performance in the training modules were closely monitored. The results of the different study groups were compared and contrasted through pre - test and post - test data analysis. It was found that the three study groups that adopted different computer - assisted memory retraining strategies （self-paced, feedback enhanced, and visual presentation） showed significant training effects. However, the visual presentation group showed insignificant improvement in their memory self-efficacy. There is also significant correlation between the pre - training self-efficacy and the memory retraining outcomes. Further data analysis will be performed to compare the computer -assisted memory retraining method to the control conventional therapist-administered method.

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Prostate cancer detection upon transrectal ultrasound-guided biopsy in relation to digital rectal examination and prostate-specific antigen level： what to expect in the Chinese population？

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Asian Journal of Andrology 2015年第5期17卷 821-825,I0010页

作者： Jeremy YC Teoh Steffi KK Yuen James HL Tsu Charles KW wong Brian SH Ho Ada TL Ng Wai-Kit Ma Kwan-Lun Ho Ming-kwong Yiu Department of Surgery Division of Urology Queen Mary Hospital University of Hong Kong Hong Kong China

We investigated the prostate cancer detection rates upon transrectal ultrasound （TRUS）-guided biopsy in relation to digital rectal examination （DRE） and prostate-specific antigen （PSA）, and risk factors of prostate cancer detection in the Chinese population. Data from all consecutive Chinese men who underwent first TRUS-guided prostate biopsy from year 2000 to 2013 was retrieved from our database. The prostate cancer detection rates with reference to DRE finding and PSA level of 〈 4, 4-10, 10.1-20, 20.1-50 and 〉 50 ng ml^-1 were investigated. Multivariate logistic regression analyses were performed to investigate for potential risk factors of prostate cancer detection. A total of 2606 Chinese men were included. In patients with normal DRE, the cancer detection rates were 8.6%, 13.4%, 21.8%, 41.7% and 85.2% in patients with PSA 〈 4, 4-10, 10.1-20, 20.1-50 and 〉 50 ng ml^-1 respectively. In patients with abnormal DRE, the cancer detection rates were 12.4%, 30.2%, 52.7%, 80.6% and 96.4% in patients with PSA 〈 4, 4-10, 10.1-20, 20.1-50 and 〉 50 ng m1-1 respectively. Older age, smaller prostate volume, larger number of biopsy cores, presence of abnormal DRE finding and higher PSA level were associated with increased risk of prostate cancer detection upon multivariate logistic regression analyses （P 〈 0.001）. Chinese men appeared to have lower prostate cancer detection rates when compared to the Western population. Taking the different risk factors into account, an individualized approach to the decision of TRUS-guided biopsy can be adopted.

关键词： Chinese digital rectal examination prostate biopsy prostate cancer prostate-specific antigen

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A PUTONGHUA RECOGNIZER

A PUTONGHUA RECOGNIZER

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第四届全国人机语音通讯学术会议

作者： Pak-kwong wong Chorkin CHAN Department of Computer Science The University of Hong Kong Department of Computer Science Pokfulam Road Hong Kong

＜正＞A multi-speaker continuous Putonghua recognizer has been developed composing of 20 speaker-dependent rec-ognizers as sub-systems. Each sub-system is a network of hidden Markov models modeling triphones as the fundamental speech units. Over 3GB of speech data have been collected for training from twenty native Putonghua speakers reading carefully designed texts trying to include all phone-to-phone transitions in Putonghua. An A* backward search yields the n-best syllable sequences over the HMMnet for each unknown input utterance which is then passed down to a language model for post-processing. The most suitable word sequence is determined by means of the bigrarn statistics of some 200 word classes covering a vocabulary of over 80,000 words. An enrolment process is required for each new user to select the most suitable speaker-dependent system among the 20 sub-systems according to their recognition performances on a small quantity of speech data collected from the user. The recognition accuracy is usually rather low at the beginning. By correcting the recognition errors and keeping the recognized utterances for periodic system re-train, a recognizer tailored for the user can be arrived at.

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Photodynamic therapy-mediated modulation of inflammatory cytokine production by Epstein–Barr virus-infected nasopharyngeal carcinoma cells

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Cellular & Molecular Immunology 2010年第4期7卷 323-326页

作者： Ho-Kee Koon Kwok-Wai Lo Kwok-Nam Leung Maria Li Lung Chris Chi-kwong Chang Ricky Ngok-Shun wong Wing-Nang Leung Nai-Ki Mak Department of Biology Hong Kong Baptist UniversityKowloonHong Kong Department of Anatomical and Cellular Biology and State Key Laboratory in Oncology in South China Prince of Wales HospitalShatinHong Kong Department of Biochemistry and Food and nutritional Sciences Programme The Chinese University of Hong KongShatinHong Kong Department of Biology Hong Kong University of Science and TechnologyHong Kong Department of Chemistry Hong Kong University of Science and TechnologyKowloonHong Kong School of Chinese Medicine The Chinese University of Hong KongShatinHong Kong

Nasopharyngeal carcinoma(NPC)is a malignant disease associated with Epstein–Barr virus(EBV)*** study aims to examine the effects of EBV infection on the production of proinflammatory cytokines in NPC cells after the Zn-BC-AM photodynamic therapy(PDT)*** were treated with the photosensitiser Zn-BC-AM for 24 h before light *** ELISA was used to evaluate the production of *** the same experimental condition,HK-1-EBV cells produced a higher basal level of IL-1a(1561 pg/ml),IL-1b(16.6 pg/ml)and IL-8(422.9 pg/ml)than the HK-1 *** the light dose of 0.25–0.5 J/cm2,Zn-BC-AM PDT-treated HK-1-EBV cells were found to produce a higher level of IL-1a and IL-1b than the HK-1 *** production of IL-1b appeared to be mediated via the IL-1b-converting enzyme(ICE)-independent *** contrast,the production of angiogenic IL-8 was downregulated in both HK-1 and HK-1-EBV cells after Zn-BC-AM *** results suggest that Zn-BC-AM PDT might indirectly reduce tumour growth through the modulation of cytokine production.

关键词： Photodynamic therapy nasopharyngeal carcinoma cytokines Epstein-Barr virus

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Outcomes of emergency and interval hepatectomy for ruptured resectable hepatocellular carcinoma: a single tertiary referral centre experience

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Hepatoma Research 2017年第9期3卷 196-204页

作者： Andrew Kai Yip Fung Charing Ching Ning Chong Kit fai Lee John wong Yue Sun Cheung Anthony kwong Wai Fong Paul Bo San Lai Department of Surgery the Chinese University of Hong KongPrince of Wales HospitalHong Kong 999077Hong KongChina

Aim: The short and long term outcomes of patients who underwent emergency and interval hepatectomy for ruptured and resectable hepatocellular carcinoma (HCC) were analysed. Methods: The data of patients with ruptured HCC presenting between April 2004 and October 2015 were analysed. Emergency hepatectomy was defined as hepatectomy within 48 h of the clinico-radiological diagnosis of HCC rupture. Results: Thirty patients underwent hepatectomy for ruptured HCC. Nine (30%) patients underwent emergency hepatectomy. The median age was 56 and 54 years (P = 0.13) with a similar gender distribution. The mean HCC size (10.5 vs. 8.3 cm, P = 0.17), total blood loss (3,000 vs. 850 mL, P = 0.002) and total units of red blood cell transfusion (1.9 vs. 0.5 units, P = 0.27) were greater in the emergency hepatectomy group. The complication rate was 44% and 38% (P = 0.53), with median length of hospital stay of 10 and 12 days (P = 0.07) in the emergency and interval hepatectomy groups, respectively, and no 30-day mortality in both groups. The median overall survival was 29 and 15.7 months (P = 0.25), with survival rates of 78%, 45%, 0% and 85%, 43% and 5% at 1, 3 and 5 years in the emergency and interval hepatectomy groups, respectively. Conclusion: Hepatectomy should be considered for ruptured HCC provided the patient could tolerate curative resection.

关键词： Hepatocellular carcinoma rupture hepatectomy

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Comprehensive analysis of results of surgical treatment of oraltongue carcinoma in Hong Kong

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Chinese Medical Journal 1997年第11期 43-48页

作者： Po Wing Yuen, William I. Wei, Yue Ming wong, kwong Chi Tang and Lai Kun Lam

Objective To evaluate the results of primary surgical treatment of carcinoma of oral tongue in Hong Kong. Methods Patients who had undergone primary surgical treatment of oral tongue carcinoma in Queen Mary Hospital were reviewed. Results There were 112 patients in this study. The first sites of tumor recurrence were 10 (9%) local, 25 (22%) nodal, 3 (3%) locoregional, 5 (5%) distant, 1 (1%) local and distant, 3 (3%) nodal and distant, and 1 (1%) neck extranodal site. Of the 63 T1 2 N0 M0 patients, the regional recurrence rate was 9% for elective neck dissection compared with 47% for “watchful waiting” (Chi square test, [WTBX]P=0.0008). The regional recurrence related mortality was 3% for elective neck dissection compared with 23% for “watchful waiting” (Fisher's test, P=0.02). The 5 year actuarial survival rate was 86% for elective neck dissection compared with 55% for “watchful waiting” (Wilcoxon, P=0.01). Conclusions Local and regional recurrences were the main sites of treatment failure. Elective neck dissection has significant benefits in the reduction of regional failure and improvement of survival. Elective selective Ⅰ Ⅲ neck dissection have to be considered in patients with stage Ⅰ and stage Ⅱ oral tongue carcinoma.

关键词： analysis results oraltongue Hong Comprehensive

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Overcoming Data Sparseness Problem in Statistical Corpus Based Sense Disambiguation

Overcoming Data Sparseness Problem in Statistical Corpus Bas...

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The 10th EPMESC

作者： Francisco Oliveira fai wong Anna Ho Faculty of Science and Technology University of Macau Macao China Faculty of Science and Technology University of Macau Macao China Faculty of Science and Technology University of Macau Macao China

The problem of data sparseness is considered as a common problem for Statistical Corpus based Word Sense Disambiguation (WSD) approaches [1]. Usually large amounts of data are required in the corpus t

关键词： Word Sense Disambiguation Data Sparseness problem Singular Value Decomposition

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SHIP:Searching Heuristically over the Internet for the Desired Page

SHIP:Searching Heuristically over the Internet for the Desir...

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第二十届全国数据库学术会议

作者： Kam-fai wong Chun-Hung Cheng Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong

In this paper a novel heuristic-based algorithm,SHIP,for deriving a Web address from a given company name is *** enables a user to locate the desired Web pages *** to classical contentbased algorithms for"company sear... 详细信息

关键词： Web page Searching Heuristically Desired page

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The performance characteristics of prostate-specific antigen and prostate-specific antigen density in Chinese men

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Asian Journal of Andrology 2017年第1期19卷 113-116页

作者： Jeremv YC Teoh Steffi KK Yuen James HL Tsu Charles KW wong Brian SH Ho Ada TL Ng Wai-Kit Ma Kwan-Lun Ho Ming-kwong Yiu Division of Urology Department of Surgery Queen Mary Hospital University of Hong Kong Hong Kong China

We investigated the performance characteristics of prostate-specific antigen （PSA） and PSA density （PSAD） in Chinese men. All Chinese men who underwent transrectal ultrasound-guided prostate biopsy （TRUS-PB） from year 2000 to 2013 were included. The receiver operating characteristic （ROC） curves for both PSA and PSAD were analyzed. The sensitivity, specificity, positive predictive value （PPV） and negative predictive value （NPV） at different cut-off levels were calculated. A total of 2606 Chinese men were included. For the ROC, the area under curve was 0.770 for PSA （P〈 0.001） and 0.823 for PSAD （P〈 0.001）. PSA of 4.5 ng ml^-1 had sensitivity of 94.4%, specificity of 14.1%, PPV of 29.5%, and NPV of 86.9%; PSAD of 0.12 ng ml^-1cc^-1 had sensitivity of 94.5%, specificity of 26.6%, PPV of 32.8%, and NPV of 92.7%. On multivariate logistic regression analyses, PSA cut-off at 4.5 ng ml^-1 （OR 1.61, 95% CI 1.05-2.45, P = 0.029） and PSAD cut-off at 0.12 ng ml^-1 cc^-1 （OR 6.22, 95% CI 4.20-9.22, P 〈 0.001） were significant predictors for prostate cancer detection on TRUS-PB. In conclusion, the performances of PSA and PSAD at different cut-off levels in Chinese men were very different from those in Caucasians. PSA of 4.5 ng ml^-1 and PSAD of O. 12 ng ml^-1 cc^-1 had near 95% sensitivity and were significant predictors of prostate cancer detection in Chinese men.

关键词： Chinese prostate cancer transrectal ultrasound-guided prostate biopsy prostate-specific antigen prostate-specific antigen density

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