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649 results on '"Chi, Chi-Hung"'

1. Object-level Copy-Move Forgery Image Detection based on Inconsistency Mining

Author

Wang, Jingyu, Jing, Niantai, Liu, Ziyao, Nie, Jie, Qi, Yuxin, Chi, Chi-Hung, and Lam, Kwok-Yan

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

In copy-move tampering operations, perpetrators often employ techniques, such as blurring, to conceal tampering traces, posing significant challenges to the detection of object-level targets with intact structures. Focus on these challenges, this paper proposes an Object-level Copy-Move Forgery Image Detection based on Inconsistency Mining (IMNet). To obtain complete object-level targets, we customize prototypes for both the source and tampered regions and dynamically update them. Additionally, we extract inconsistent regions between coarse similar regions obtained through self-correlation calculations and regions composed of prototypes. The detected inconsistent regions are used as supplements to coarse similar regions to refine pixel-level detection. We operate experiments on three public datasets which validate the effectiveness and the robustness of the proposed IMNet., Comment: 4 pages, 2 figures, Accepted to WWW 2024

Published
2024

3. SE-shapelets: Semi-supervised Clustering of Time Series Using Representative Shapelets

Author

Cai, Borui, Huang, Guangyan, Yang, Shuiqiao, Xiang, Yong, and Chi, Chi-Hung

Subjects
Computer Science - Machine Learning
Abstract

Shapelets that discriminate time series using local features (subsequences) are promising for time series clustering. Existing time series clustering methods may fail to capture representative shapelets because they discover shapelets from a large pool of uninformative subsequences, and thus result in low clustering accuracy. This paper proposes a Semi-supervised Clustering of Time Series Using Representative Shapelets (SE-Shapelets) method, which utilizes a small number of labeled and propagated pseudo-labeled time series to help discover representative shapelets, thereby improving the clustering accuracy. In SE-Shapelets, we propose two techniques to discover representative shapelets for the effective clustering of time series. 1) A \textit{salient subsequence chain} ($SSC$) that can extract salient subsequences (as candidate shapelets) of a labeled/pseudo-labeled time series, which helps remove massive uninformative subsequences from the pool. 2) A \textit{linear discriminant selection} ($LDS$) algorithm to identify shapelets that can capture representative local features of time series in different classes, for convenient clustering. Experiments on UCR time series datasets demonstrate that SE-shapelets discovers representative shapelets and achieves higher clustering accuracy than counterpart semi-supervised time series clustering methods.

Published
2023

6. Secure Multi-Party Delegated Authorisation For Access and Sharing of Electronic Health Records

Author

Tan, Kheng-Leong, Chi, Chi-Hung, and Lam, Kwok-Yan

Subjects
Computer Science - Cryptography and Security, Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

Timely sharing of electronic health records (EHR) across providers is essential and significance in facilitating medical researches and prompt patients' care. With sharing, it is crucial that patients can control who can access their data and when, and guarantee the security and privacy of their data. In current literature, various system models, cryptographic techniques and access control mechanisms are proposed which requires patient's consent before sharing. However, they mostly focus on patient is available to authorize the access of the EHR upon requested. This is impractical given that the patient may not always be in a good state to provide this authorization, eg, being unconscious and requires immediate medical attention. To address this gap, this paper proposes an efficient and secure protocol for the pre-delegation of authorization to multi-party for the access of the EHR when patient is unavailable to do so. The solution adopts a novel approach to combine self-sovereign identity concepts and framework with secure multi-party computation to enable secure identity and authorization verification. Theoretical analysis showed that it increased the efficiency of the protocol and verification processes to ensure the security and privacy of patient's data.

Published
2022

7. Analysis of Digital Sovereignty and Identity: From Digitization to Digitalization

Author

Tan, Kheng-Leong, Chi, Chi-Hung, and Lam, Kwok-Yan

Subjects
Computer Science - Cryptography and Security, Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Software Engineering
Abstract

Advances in emerging technologies have accelerated digital transformation with the pervasive digitalization of the economy and society, driving innovations such as smart cities, industry 4.0 and FinTech. Unlike digitization, digitalization is a transformation to improve processes by leveraging digital technologies and digitized data. The cyberspace has evolved from a hardware internetworking infrastructure to the notion of a virtual environment, transforming how people, business and government interact and operate. Through this transformation, lots of personal data are captured which individuals have no ownership or control over, threatening their privacy. It is therefore necessary for the data owners to have control over the ownership, custody and utilization of their data and to protect one's digital assets and identity through proper data governance, cybersecurity control and privacy protection. This results in the notions of data sovereignty and digital sovereignty - two conceptually related terms, but different focuses. This paper first explains these two concepts in terms of their guiding principles, laws and regulations requirements, and analyse and discuss the technical challenges of implementing these requirements. Next, to understand the emerging trend shift in digital sovereignty towards individuals to take complete control of the security and privacy of their own digital assets, this paper conducts a systematic study and analysis of Self-Sovereign Identity, and discuss existing solutions and point out that an efficient key management system, scalability and interoperability of the solutions and well established standards are some of its challenges and open problems to wide deployments.

Published
2022

11. Emerging Scientific Topic Discovery by Finding Infrequent Synonymous Biterms

Author

Wu, Junfeng, Huang, Guangyan, Zarei, Roozbeh, Li, Jianxin, Huang, Guang-Li, Zheng, Hui, He, Jing, Chi, Chi-Hung, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Gama, João, editor, Li, Tianrui, editor, Yu, Yang, editor, Chen, Enhong, editor, Zheng, Yu, editor, and Teng, Fei, editor

Published
2022
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16. Flexible Shapelets Discovery for Time Series Classification

Author

Cai, Borui, Huang, Guangyan, Turkedjieva, Maia Angelova, Xiang, Yong, Chi, Chi-Hung, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Barbosa, Simone Diniz Junqueira, Founding Editor, He, Jing, editor, Yu, Philip S., editor, Shi, Yong, editor, Li, Xingsen, editor, Xie, Zhijun, editor, Huang, Guangyan, editor, Cao, Jie, editor, and Xiao, Fu, editor

Published
2020
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17. Clustering Hashtags Using Temporal Patterns

Author

Cai, Borui, Huang, Guangyan, Yang, Shuiqiao, Xiang, Yong, Chi, Chi-Hung, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Huang, Zhisheng, editor, Beek, Wouter, editor, Wang, Hua, editor, Zhou, Rui, editor, and Zhang, Yanchun, editor

Published
2020
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18. A Model-based Approach for Effective Service Delivery

Author

Li, Feng-Lin and Chi, Chi-Hung

Subjects
Computer Science - Software Engineering
Abstract

With the prevalence of X-as-a-Service (e.g., software as a service, platform as a service, infrastructure as a service, etc.) and users' growing demand on good services, QoS (Quality of Service) assurance is becoming increasingly important to service delivery. Traditional service delivery mainly focuses on function or information provisioning, and does not give high priority to quality assurance. In this paper, we tackle the QoS assurance problem in a systematic way, from model to system. We first decompose traditional services into three components - namely software application, data and resource, then define models for these three kinds of basic services, and propose a set of operations for service publishing and composition. To illustrate our approach, we present a prototype system, the Platform as a Service (PaaS) system, which is developed in support of our framework and shows how QoS can be ensured through real-time monitoring and dynamic scaling (up or down).

Published
2016

19. Service Intelligence Oriented Distributed Data Stream Integration

Author

Li, Feng-Lin, Chi, Chi-Hung, Wang, Yue, and Liu, Cong

Subjects
Computer Science - Software Engineering
Abstract

Software as a service (SaaS) has recently enjoyed much attention as it makes the use of software more convenient and cost-effective. At the same time, the arising of users' expectation for high quality service such as real-time information or functionality provisioning brings about new challenges: to satisfy such (near) real-time requirements, real-time monitoring and effective processing of streaming data is necessary. However, due to the composition structure and multi-instance property of services, service data streams are often distributed, hard to synchronize and aggregate. We tackles these challenges by (1) proposing systematic associate strategies for relating distributed data; (2) introducing a new small window array mechanism for aggregating distributed data; (3) setting window parameters based on the cumulative distribution function (CDF) method; and (4) modeling streaming operators with queuing models for performance evaluation and prediction. Experiments show that our approach has good accuracy, completeness and acceptable performance measurement in processing distributed service data streams., Comment: To be submitted to FGCS, 28 pages, 15 figures

Published
2016

20. TOM: A Threat Operating Model for Early Warning of Cyber Security Threats

Author

Bo, Tao, Chen, Yue, Wang, Can, Zhao, Yunwei, Lam, Kwok-Yan, Chi, Chi-Hung, Tian, Hui, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Jianxin, editor, Wang, Sen, editor, Qin, Shaowen, editor, Li, Xue, editor, and Wang, Shuliang, editor

Published
2019
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21. Unfolding the Mixed and Intertwined: A Multilevel View of Topic Evolution on Twitter

Author

Zhao, Yunwei, Wang, Can, Han, Han, van den Heuvel, Willem-Jan, Chi, Chi-Hung, Li, Weimin, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Jianxin, editor, Wang, Sen, editor, Qin, Shaowen, editor, Li, Xue, editor, and Wang, Shuliang, editor

Published
2019
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22. Top-N Hashtag Prediction via Coupling Social Influence and Homophily

Author

Wang, Can, Sun, Zhonghao, Zhao, Yunwei, Chi, Chi-Hung, van den Heuvel, Willem-Jan, Lam, Kwok-Yan, Stantic, Bela, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Jianxin, editor, Wang, Sen, editor, Qin, Shaowen, editor, Li, Xue, editor, and Wang, Shuliang, editor

Published
2019
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23. A Methodology for Resolving Heterogeneity and Interdependence in Data Analytics

Author

Han, Han, Zhao, Yunwei, Wang, Can, Shu, Min, Peng, Tao, Chi, Chi-Hung, Yu, Yonghong, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Jianxin, editor, Wang, Sen, editor, Qin, Shaowen, editor, Li, Xue, editor, and Wang, Shuliang, editor

Published
2019
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26. A Multi-protocol Authentication Shibboleth Framework and Implementation for Identity Federation

Author

Li, Mengyi, Chi, Chi-Hung, Ding, Chen, Wong, Raymond, She, Zhong, Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Beyah, Raheem, editor, Chang, Bing, editor, Li, Yingjiu, editor, and Zhu, Sencun, editor

Published
2018
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28. Identity in the Internet-of-Things (IoT): New Challenges and Opportunities

Author

Lam, Kwok-Yan, Chi, Chi-Hung, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Lam, Kwok-Yan, editor, Chi, Chi-Hung, editor, and Qing, Sihan, editor

Published
2016
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29. Predominant global glomerulosclerosis in patients of upper urinary tract urothelial carcinoma with pre-existing renal function impairment is a predictor of poor renal outcomes

Author

Sheng-Wen Niu, Peir-In Liang, Ming-Yen Lin, Shih-Meng Yeh, Yen-Yi Zhen, Yu-Han Chang, Pin-Chia Huang, Chi-Chi Hung, I-Ching Kuo, Hugo You-Hsien Lin, Mei-Chuan Kuo, Wei-Ming Li, Chun-Nung Huang, Wen-Jeng Wu, Li-Tzong Chen, Yi-Wen Chiu, and Shang-Jyh Hwang

Subjects
Upper urinary tract urothelial carcinoma, Renal cell carcinoma, Renal survival, Tubulointerstitial nephropathy, Glomerulosclerosis, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Abstract Background Incidence of renal dysfunction and risks of progression to end-stage renal disease (ESRD) were reported higher in upper urinary tract urothelial carcinoma (UTUC) than in renal cell carcinoma (RCC) patients after unilateral nephrectomy. Methods Totally 193 renal cancer patients, including 132 UTUC and 61 RCC, were studied to clarify whether the pathological changes of the kidney remnant removed from nephrectomy and the clinical factors might predict the risk of ESRD. Renal tubulointerstitial (TI) score and global glomerulosclerosis (GGS) rate were examined by one pathologist and two nephrologists independently under same histopathological criteria. Results The glomerular filtration rates at the time of surgery were lower in UTUC than RCC groups (p

Published
2019
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31. Interrelationships of Service Orchestrations

Author

Chu, Victor W., Wong, Raymond K., Chen, Fang, Chi, Chi-Hung, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Li, Jinyan, editor, Li, Xue, editor, Wang, Shuliang, editor, Li, Jianxin, editor, and Sheng, Quan Z., editor

Published
2016
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40. Data Mining Service Based on MDA

Author

Chen, Yiqun, Chi, Chi-Hung, Yin, Jian, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, and Lam, Kwok-Yan, editor

Published
2004
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41. Real-Time Emulation of Intrusion Victim in HoneyFarm

Author

He, Xing-Yun, Lam, Kwok-Yan, Chung, Siu-Leung, Chi, Chi-Hung, Sun, Jia-Guang, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, and Lam, Kwok-Yan, editor

Published
2004
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42. Fractional Gaussian Noise: A Tool of Characterizing Traffic for Detection Purpose

Author

Li, Ming, Chi, Chi-Hung, Long, Dongyang, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, and Lam, Kwok-Yan, editor

Published
2004
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43. What Are People Looking for in Your Web Page?

Author

Ding, Chen, Chi, Chi-Hung, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, and Lam, Kwok-Yan, editor

Published
2004
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44. Unveiling the Performance Impact of Lossless Compression to Web Page Content Delivery

Author

Yuan, Jun-Li, Chi, Chi-Hung, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, van Steen, Maarten, editor, and Wills, Craig, editor

Published
2004
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45. Data Integrity Framework and Language Support for Active Web Intermediaries

Author

Chi, Chi-Hung, Yu, Xiao-Yan, Zhang, Wenjie, Ding, Chen, Wong, Weng-Fai, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, van Steen, Maarten, editor, and Wills, Craig, editor

Published
2004
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46. Application Networking – An Architecture for Pervasive Content Delivery

Author

Su, Mu, Chi, Chi-Hung, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chi, Chi-Hung, editor, van Steen, Maarten, editor, and Wills, Craig, editor

Published
2004
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48. Modeling User’s Non-functional Preferences for Personalized Service Ranking

Author

Mirmotalebi, Rozita, Ding, Chen, Chi, Chi-Hung, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Liu, Chengfei, editor, Ludwig, Heiko, editor, Toumani, Farouk, editor, and Yu, Qi, editor

Published
2012
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