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Incremental Model-based Test Suite Reduction with Formal Concept Analysis
Ng, Pin,Fung, Richard Y.K.,Kong, Ray W.M. Korea Information Processing Society 2010 Journal of information processing systems Vol.6 No.2
Test scenarios can be derived based on some system models for requirements validation purposes. Model-based test suite reduction aims to provide a smaller set of test scenarios which can preserve the original test coverage with respect to some testing criteria. We are proposing to apply Formal Concept Analysis (FCA) in analyzing the association between a set of test scenarios and a set of transitions specified in a state machine model. By utilizing the properties of concept lattice, we are able to determine incrementally a minimal set of test scenarios with adequate test coverage.
New Results in Common Functional State Estimation for Two Linear Systems with Unknown Inputs
Jiunn Yea Ng,Chee Pin Tan,Kok Yew Ng,Hieu Trinh 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6
This paper presents new developments in common functional observers for two systems. We improve an existing common functional observer scheme by reducing its order, and then investigate its existence conditions in terms of the original system matrices. These conditions have never been explored and they enable the users to know at the outset the class of systems for which the scheme is applicable. They also show that both observers can be designed independently of each other which significantly simplifies the design process. A numerical simulation verifies the findings.
Chee Pin Tan,Kok Yew Ng,Zhihong Man,Rini Akmeliawati 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.3
This paper presents a disturbance decoupled fault reconstruction (DDFR) scheme using two sliding mode observers in cascade. Measurable signals from the first observer are found to be the output of a fictitious system that is driven by the fault and disturbances. Then the signals are fed into a second observer which will reconstruct the fault. Sufficient conditions which guarantee DDFR are investigated and presented in terms of the original system matrices, and they are found to be less conservative than if only one single observer is used; therefore DDFR can be achieved for a wider class of systems using two sliding mode observers. A simulation example validates the claims made in this paper.
Modified Criteria for Diagnosing “Cognitive Frailty”
Chang Won Won,Yunhwan Lee,Sunyoung Kim,Jinho Yoo,Miji Kim,Tze-Pin Ng,Haena Kim,Sang Joon Son 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.9
The concept of cognitive frailty has recently been proposed by an International Consensus Group as the presence of physical frailty and cognitive impairment [defined using the Clinical Dementia Ratings (CDR)=0.5], without concurrent dementia. However, CDR is difficult to implement and not often available in epidemiologic studies or busy clinical settings, and an alternative to CDR is required. We suggest an alternative definition of cognitive frailty as: 1) physical frailty, 2) more than 1.5 standard deviation below the mean for age-, gender-, and education-adjusted norms on any cognitive function test (e.g., the Montreal Cognitive assessment test, the Alzheimer’s disease assessment scale-cognitive subscale, verbal learning test, Digit Span, Boston Naming Test, Trail Making Test, and Frontal Assessment Battery), and 3) no dependency in instrumental activities of daily living. The redefined criteria for cognitive frailty would be more feasible to implement and thus more applicable in epidemiologic studies and busy clinical settings.
Dong Il Park,Tadakazu Hisamatsu,Min-Hu Chen,Siew Chien Ng,Choon Jin Ooi,Shu Chen Wei,Rupa Banerjee,Ida Normiha Hilmi,Yoon Tae Jeen,한동수,Hyo Jong Kim,Zhi Hua Ran,Kaichun Wu,Jiaming Qian,Pin-Jin Hu,Katsu 대한장연구학회 2018 Intestinal Research Vol.16 No.1
Because anti-tumor necrosis factor (anti-TNF) therapy has become increasingly popular in many Asian countries, the risk of developing active tuberculosis (TB) among anti-TNF users may raise serious health problems in this region. Thus, the Asian Organization for Crohn’s and Colitis and the Asia Pacific Association of Gastroenterology have developed a set of consensus statements about risk assessment, detection and prevention of latent TB infection, and management of active TB infection in patients with inflammatory bowel disease (IBD) receiving anti-TNF treatment. Twenty-three consensus statements were initially drafted and then discussed by the committee members. The quality of evidence and the strength of recommendations were assessed by using the Grading of Recommendations Assessment, Development, and Evaluation methodology. Web- based consensus voting was performed by 211 IBD specialists from 9 Asian countries concerning each statement. A consensus statement was accepted if at least 75% of the participants agreed. Part 2 of the statements comprised 3 parts: management of latent TB in preparation for anti-TNF therapy, monitoring during anti-TNF therapy, and management of an active TB infection after anti-TNF therapy. These consensus statements will help clinicians optimize patient outcomes by reducing the morbidity and mortality related to TB infections in patients with IBD receiving anti-TNF treatment.
Coexistence of osteoporosis, sarcopenia and obesity in community-dwelling adults – The Yishun Study
Benedict Wei Jun Pang,Shiou-Liang Wee,Kenneth Kexun Chen,Lay Khoon Lau,Khalid Abdul Jabbar,Wei Ting Seah,Daniella Hui Min Ng,Queenie Lin Ling Tan,Mallya Ullal Jagadish,Tze Pin Ng 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.1
Objectives: To 1) report prevalence of ‘osteosarcopenia’ (OS) and osteosarcopenic obesity (OSO) entities using evidence-based diagnostic techniques and definitions, 2) examine if OSO offers additional predictive value of functional decline over its components, and 3) identify associated factors in a multi-racial Southeast Asian population. Methods: We performed a cross-sectional study of a representative sample of 542 community-dwelling adults (21e90 years old), and assessed anthropometry, cognition, functional performance, and selfreport sociodemographic, health and lifestyle questionnaires. Low muscle mass, and the Asian Working Group for Sarcopenia (AWGS) 2019 criteria, were used to assess sarcopenia. Obesity was defined using percentage body fat and fat mass index. Osteopenia/osteoporosis was determined using lumbar spinal bone mineral density. Associated factors were examined using logistic regression, and OSO’s value investigated using linear regressions with functional performance. Results: OS and OSO prevalence were 1.8% and 0% (21e59 years), 12.9% and 2.8% ( 60 years), 17.3% and 4.1% ( 65 years), and 25.5% and 7.0% (75 years), respectively. OSO entity as defined was not a significant predictor (P > 0.05) and did not improve explanations for functional decline over sarcopenia or sarcopenic obesity. Age, sex, race and body mass index (BMI) were associated with OS, while age, sex, race and alcoholism were associated with OSO. Conclusions: Our results do not support OSO as a distinct entity in relation to functional decline. Aside from biological age, sex, and race, amenable lifestyle factors such as BMI and alcohol intake are important variables that can influence the co-existence of osteopenia/osteoporosis, sarcopenia and obesity.