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Search Results: 1 - 10 of 5175 matches for " Hock Kuang Lim "
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A Microwave-Based Invisible “Watermarking” Emulated by an Embedded Set of Electromagnetic Material in a Plastic Card  [PDF]
Perambur Neelakanta, Swee-Hock Lim
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.23018
Abstract: This article describes a passive, economical strategy towards enhancing the security feature of conventional plastic cards by embedding a set of electromagnetic (EM) material that emulates an invisible “watermarking”. This is an overlay strategy to prevailing security measures and consists of incorporating (invisibly embedding, say by ink-jet printing or otherwise) a set of foil/film-like grids of electromagnetic (EM) material (such as high-μ material or high-conductivity metal) within the cross-section of the card. The test-card when exposed to a suitable excitation of microwave (ISM band) excitation, the embedment of EM material in the card is rendered to yield distinct path-loss to the traversing EM energy. That is, by making each element of embedment a grid-frame made of vertical or set of horizontal strips, (relative to the plane of polarization of EM excitation), each grid-frame will offer high (logic 1) or low (logic 0) transmissions when the card is swiped across the EM field. By sensing appropriately, this differentiable EM attenuation across the card would depict an output signal annunciating the presence of a binary-logic encoding in the embedded “watermarking”. The proposed effort augments the existing security features of a plastic card design and robustly reduces the chances of malpractices, such as plastic card counterfeiting and misuse. The concept-design as proposed is positively verified through experimental test cards and also justified with theoretical considerations.
Epidemiology of smoking among Malaysian adult males: prevalence and associated factors
Hock Kuang Lim, Sumarni Mohd Ghazali, Cheong Chee Kee, Kuay Kuang Lim, Ying Ying Chan, Huey Chien Teh, Ahmad Faudzi Mohd Yusoff, Gurpreet Kaur, Zarihah Mohd Zain, Mohamad Haniki Nik Mohamad, Sallehuddin Salleh
BMC Public Health , 2013, DOI: 10.1186/1471-2458-13-8
Abstract: A cross-sectional study among 15,639 Malaysian adult males aged 18 years and above was conducted using proportional to size stratified sampling method. The socio-demographic variables examined were level of education, occupation, marital status, residential area, age group and monthly household income.The prevalence of smoking among adult males in Malaysia was 46.5% (95% CI: 45.5–47.4%), which was 3% lower than a decade ago. Mean age of smoking initiation was 18.3 years, and mean number of cigarettes smoked daily was 11.3. Prevalence of smoking was highest among the Malays (55.9%) and those aged 21–30 years (59.3%). Smoking was significantly associated with level of education (no education OR 2.09 95% CI (1.67–2.60), primary school OR 1.95, 95% CI (1.65–2.30), secondary school OR 1.88, 95% CI (1.63–2.11), with tertiary education as the reference group). Marital status (divorce OR 1.67, 95% CI (1.22–2.28), with married as the reference group), ethnicity (Malay, OR 2.29, 95% CI ( 1.98–2.66; Chinese OR 1.23 95% CI (1.05–1.91), Other Bumis OR 1.75, 95% CI (1.46–2.10, others OR 1.48 95% CI (1.15–1.91), with Indian as the reference group), age group (18–20 years OR 2.36, 95% CI (1.90–2.94); 20–29 years OR 3.31 , 95% CI 2.82–3.89; 31–40 years OR 2.85 , 95% CI ( 2.47–3.28); 41–50 years OR 1.93, 95% CI (1.69–2.20) ; 51–60 years OR 1.32, 95% CI (1.15–1.51), with 60 year-old and above as the reference group) and residential area (rural OR 1.12 , 95% CI ( 1.03–1.22)) urban as reference.The prevalence of smoking among Malaysian males remained high in spite of several population interventions over the past decade. Tobacco will likely remain a primary cause of premature mortality and morbidity in Malaysia. Continuous and more comprehensive anti-smoking policy measures are needed in order to further prevent the increasing prevalence of smoking among Malaysian men, particularly those who are younger, of Malay ethnicity, less educated, reside in rural residential area and with lower
Positioning Accuracy Improvement via Distributed Location Estimate in Cooperative Vehicular Networks
Kai Liu,Hock Beng Lim
Computer Science , 2012,
Abstract: The development of cooperative vehicle safety (CVS) applications, such as collision warnings, turning assistants, and speed advisories, etc., has received great attention in the past few years. Accurate vehicular localization is essential to enable these applications. In this study, motivated by the proliferation of the Global Positioning System (GPS) devices, and the increasing sophistication of wireless communication technologies in vehicular networks, we propose a distributed location estimate algorithm to improve the positioning accuracy via cooperative inter-vehicle distance measurement. In particular, we compute the inter-vehicle distance based on raw GPS pseudorange measurements, instead of depending on traditional radio-based ranging techniques, which usually either suffer from high hardware cost or have inadequate positioning accuracy. In addition, we improve the estimation of the vehicles' locations only based on the inaccurate GPS fixes, without using any anchors with known exact locations. The algorithm is decentralized, which enhances its practicability in highly dynamic vehicular networks. We have developed a simulation model to evaluate the performance of the proposed algorithm, and the results demonstrate that the algorithm can significantly improve the positioning accuracy.
HER2 Amplification and Clinicopathological Characteristics in a Large Asian Cohort of Rare Mucinous Ovarian Cancer
Wen-Yee Chay, Sung-Hock Chew, Whee-Sze Ong, Inny Busmanis, Xinyun Li, Sharyl Thung, Lynette Ngo, Sheow- Lei Lim, Yong-Kuei Lim, Yin-Nin Chia, Elisa Koh, Cindy Pang, Lay-Tin Soh, Jin Wang, Tew-Hong Ho, Sun-Kuie Tay, Soo-Kim Lim-Tan, Kiat-Hon Lim, John Whay-Kuang Chia, Liang-Kee Goh
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061565
Abstract: Mucinous epithelial ovarian cancer has a poor prognosis in the advanced stages and responds poorly to conventional chemotherapy. We aim to elucidate the clinicopathological factors and incidence of HER2 expression of this cancer in a large Asian retrospective cohort from Singapore. Of a total of 133 cases, the median age at diagnosis was 48.3 years (range, 15.8–89.0 years), comparatively younger than western cohorts. Most were Chinese (71%), followed by Malays (16%), others (9.0%), and Indians (5%). 24% were noted to have a significant family history of malignancy of which breast and gastrointestinal cancers the most prominent. Majority of the patients (80%) had stage I disease at diagnosis. Information on HER2 status was available in 113 cases (85%). Of these, 31 cases (27.4%) were HER2+, higher than 18.8% reported in western population. HER2 positivity appeared to be lower among Chinese and higher among Malays patients (p = 0.052). With the current standard of care, there was no discernible impact of HER2 status on overall survival. (HR = 1.79; 95% CI, 0.66–4.85; p = 0.249). On the other hand, positive family history of cancer, presence of lymphovascular invasion, and ovarian surface involvements were significantly associated with inferior overall survival on univariate and continued to be statistically significant after adjustment for stage. While these clinical factors identify high risk patients, it is promising that the finding of a high incidence of HER2 in our Asian population may allow development of a HER2 targeted therapy to improve the management of mucinous ovarian cancers.
The Comparison between the Trimmed Mean CUSUM Chart and the Standard Mean CUSUM Chart
Habshah Midi,Azmi Jaafar,Lim Hock Ann
Matematika , 2004,
Abstract: This paper is concerned with the assessment of the performance of a robust Cumulative Sum (CUSUM) chart, which is called the Trimmed CUSUM Chart. A standard CUSUM chart is based on standard mean whilst the robust CUSUM chart is based on the trimmed mean. A series of simulations have been carried out to compare the performance of trimmed mean and standard mean CUSUM procedures by looking at the values of the average run length (ARL) and the ratio between the ARL with a mean shift and ARL without. The results show that for normal process and a sample size of 5, the standard mean CUSUM performs better than the trimmed mean CUSUM, but their performances are equally well as sample size is increased. However, for data with one outlier and highly skewed process, which is sample are simulated from a Student T and Chi Square distributions with 4, 6 and 7 degree of freedom (suitably shifted and scaled to produce common mean and variance, i.e. m = 0 and s2 = 1), the trimmed mean seems to perform better than the standard mean CUSUM.
Mohammad Al-Zoubi,Thi Lip Sam,Lim Hock Eam
Academic Research International , 2011,
Abstract: This study investigates e-government adoption among businesses in Jordan. Specifically, the objectives of the study are twofold: (a) to determine the status (level) of e-government adoption among businesses in Jordan, (b) to identify the factors that drive e-government adoption among businesses in Jordan. For this purpose, an integrated theoretical framework for assessing egovernment adoption, beyond initial adoption was developed. The responses of 113 firms were usedto determine the relationships between technological, organizational, and external factors and adoption of e-government. The result found the existence of significant relationship between the technological, organizational, and external factors and the businesses e-government adoption. It is further found that higher explicitness and accumulation of technology can help the transfer of technological knowledge within the organization and can raise the capability to adopt innovativetechnologies.
Trust: Facilitator of Knowledge-sharing Culture
Tan Nya Ling,Lim Ying San,Ng Tuan Hock
Communications of the IBIMA , 2009,
Abstract: The culture of trust in the workplace has been shown to have a strong and robust influence that act as an important force behind the sharing of knowledge. In this study, using literature review, we had clearly identified trust as one of the key facilitator that influences the development and establishment of a knowledge-sharing culture. It is hope that the contributions from this study will support and encourage organisations in making decisions on taking a step forward in inculcating a knowledge-sharing culture that shares not only valuable knowledge but also new knowledge. This is partly due to the fact that organisations nowadays are still unaware of the potential benefit and impact of knowledge in making continuous organisational development and improvement.
Prevalence of Truancy and Its Associated Factors among School-Going Malaysian Adolescents: Data from Global School-Based Health Survey 2012  [PDF]
Norzawati Yoep, Leni Tupang, Ahmad Nadzri Jai, Lim Kuang Kuay, Faizah Paiwai, Noor Safiza Mohd Nor
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.78106
Abstract: This study aimed to examine the prevalence of truancy and its associated factors among school going Malaysian adolescents. The Malaysia Global School-based Health Survey (GSHS) was conducted from February to April 2012 involving 28,933 students aged 12 - 17 years old. A two-stage cluster sampling was used to select the schools and students with an overall response rate of 88.6%. The data were obtained using the GSHS questionnaire. The prevalence of truancy was 30.8% and significantly higher among male than female (32.9% vs 28.7%). The factors associated with truancy were current smoker (aOR: 2.23; 95% CI: 2.03 - 2.46), current drug user (aOR: 2.23; 95% CI: 1.52 - 3.29), current alcohol use (aOR: 1.39; 95% CI: 1.24 - 1.56), having been bullied (aOR: 1.31; 95% CI: 1.22 - 1.42) and not currently live with both parents (aOR: 1.25; 95% CI: 1.16 - 1.35). High truancy among school going adolescents warrants a new effective strategy to control truancy in Malaysia.
Weather Impact on Heat-Related Illness in a Tropical City State, Singapore  [PDF]
Hai-Yan Xu, Xiuju Fu, Chin Leong Lim, Stefan Ma, Tian Kuay Lim, Paul Anantharajah Tambyah, Mohd Salahuddin Habibullah, Gary Kee Khoon Lee, Lee Ching Ng, Kee Tai Goh, Rick Siow Mong Goh, Lionel Kim Hock Lee
Atmospheric and Climate Sciences (ACS) , 2018, DOI: 10.4236/acs.2018.81007
Abstract: In this article we propose a novel hurdle negative binomial (HNB) regression combined with a distributed lag nonlinear model (DLNM) to model weather factors’ impact on heat related illness (HRI) in Singapore. AIC criterion is adopted to help select proper combination of weather variables and check their lagged effect as well as nonlinear effect. The process of model selection and validation is demonstrated. It is observed that the predicted occurrence rate is close to the observed one. The proposed combined model can be used to predict HRI cases for mitigating HRI occurrences and provide inputs for related public health policy considering climate change impact.
Gold nanoparticles on wool in a comparative study with molecular gold catalysts
Thomas Borrmann,Teck Hock Lim,Hannah Cope,Kerstin Lucas,Michael Lorden
Gold Bulletin , 2013, DOI: 10.1007/s13404-012-0076-3
Abstract: The catalytic activity of gold chloride nanoparticles is compared to the activity of two molecular gold(I) chloride phosphine complexes for the addition of methanol to 3-hexyne. The phosphines are triphenylphosphine and the bispidinone related bulky 6,8-bis-(4-dimethylamino-phenyl)-3-methyl-9-oxo-7-phenyl-3-aza-7-phospha-bicyclo[3.3.1]nonan-1,5-dicarboxylic acid dimethyl ester. Use of the bulky ligand made the addition reaction selective towards the enol product, meaning that no addition of methanol or water to alkenes, which were produced during the reaction, occurred. In contrast, use of triphenylphosphine gold(I) chloride resulted in the synthesis of a variety of products. The phosphines decomposed during reaction leading to the formation of gold nanoparticles, which were found to be catalytically inactive. Artificially produced gold nanoparticles also proved to be inactive. In contrast, gold chloride nanoparticles deposited on wool were active comparable to the gold phosphine-containing catalysts tested previously. Overall activities observed were low compared to results from the literature suggesting that the operating conditions chosen could be optimised.
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