http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Building structural health monitoring using dense and sparse topology wireless sensor network
Mohammad E. Haque,Mohammad F.M. Zain,Mohammad A. Hannan,Mohammad H. Rahman 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
Wireless sensor technology has been opened up numerous opportunities to advanced health and maintenance monitoring of civil infrastructure. Compare to the traditional tactics, it offers a better way of providing relevant information regarding the condition of building structure health at a lower price. Numerous domestic buildings, especially longer-span buildings have a low frequency response and challenging to measure using deployed numbers of sensors. The way the sensor nodes are connected plays an important role in providing the signals with required strengths. Out of many topologies, the dense and sparse topologies wireless sensor network were extensively used in sensor network applications for collecting health information. However, it is still unclear which topology is better for obtaining health information in terms of greatest components, node\'s size and degree. Theoretical and computational issues arising in the selection of the optimum topology sensor network for estimating coverage area with sensor placement in building structural monitoring are addressed. This work is an attempt to fill this gap in high-rise building structural health monitoring application. The result shows that, the sparse topology sensor network provides better performance compared with the dense topology network and would be a good choice for monitoring high-rise building structural health damage.
Control of an Exoskeleton Robot Arm with Sliding Mode Exponential Reaching Law
Mohammad H. Rahman,Maarouf Saad,Jean-Pierre Kenné,Philippe S. Archambault 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.1
Robots are now working not only in human environments but also interacting with humans, e.g., service robots or assistive robots. A 7DoFs robotic exoskeleton MARSE-7 (motion assistive robotic-exoskeleton for superior extremity) was developed as an assistive robot to provide movement as-sistance and/or ease daily upper-limb motion. In this paper, we highlight the nonlinear control of MARSE-7 using the modified sliding mode exponential reaching law (mSMERL). Conventional sliding control produces chattering which is undesired for this kind of robotic application as it causes damage to the mechanical structure. Compared to conventional sliding control, our approach significantly re-duces chattering and delivers a high dynamic tracking performance. The control architecture was im-plemented on a field-programmable gate array (FPGA) in conjunction with a RT-PC. In experiments, trajectory tracking that corresponds to typical passive arm movement exercises for single and multi joint movements were performed to evaluate the performance of the developed robot and the controller. Experimental results demonstrate that the MARSE-7 can effectively track the desired trajectories.
M. Mahbubur Rahman,Eunmok Kim,Mohammad M. H. Bhuyain,Dongmok Kim,Un Taek Lim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Riptortus pedestris is an important soybean pest in Korea and Japan. Aggregation pheromone traps were evaluated in 12 soybean fields in Andong using three treatments of trap installation, i.e., installation for whole cultivation period, installation up to September, and no installation. The number of R. pedestris (in all life stages) were not significantly different among the treatments until October, but its abundance significantly increased at mid October in the fields where traps were installed. Trap catch of R. pedestris was relatively higher in August while bug population was low in the fields. However, in fall, R. pedestris populations become abundant in the fields while trap catch was low. There was no significant difference in parasitism as well as seed and pod damage among the treatments. In conclusion, aggregation pheromone trap should’nt be used as control measure, but can be used as a monitoring tool of R. pedestris population up to August in soybean field.
The Sustainable Port Classification Framework for Enhancing the Port Coordination System
Mohammad Khairuddin OTHMAN,Noorul Shaiful Fitri ABDUL RAHMAN,Alisha ISMAIL,A.H. SAHARUDDIN 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.1
The port classification framework is not only beneficial for highlighting the background of the ports, but can also be utilized in the benchmarking and comparison of port coordination systems. In Malaysia, the lack of concrete justifications in the existing port classification process had resulted in a debatable framework of port classification development and consequently, confusion among the port stakeholders. As such, this study is conducted with the aim of revising the Malaysian ports' classification framework according to the global perspective of a sustainable port classification framework through the enhancement of its national port coordination system. By using a qualitative approach of descriptive analysis, the background of the port classification systems was not only analysed according to the Malaysian and global perspectives, the segregation of three different ports classes was also emphasized in the enhancement of the country's port coordination system. Apart from being a comprehensive reference that aids the academicians and stakeholders in the improvement of the existing loopholes in the Malaysian port coordination system, this paper had also offered a sustainable classification framework guideline for decision and policy-makers in the expansion of port competitiveness through a reclassification of the national port operations.
Othman Mohammad Khairuddin,Abdul Rahman Noorul Shaiful Fitri,Ismail Alisha,Saharuddin A.H. 한국해운물류학회 2020 The Asian journal of shipping and Logistics Vol.36 No.3
Malaysian ports have been recording imbalances in cargo flows year after year, whether in the form of a deficit or surplus, and the condition is becoming significant. As such, it has raised concerns among port stakeholders about the impact of such a situation on the sustainability of port operations, as well as questions about the actual reasons behind the occurrence, which is still ambiguous with regard to large-scale minor ports in Malaysia. This study was aimed at identifying the main factors that are contributing to the imbalanced cargo flows at large-scale minor ports in Malaysia by ranking all the possible factors using a systematic decision-making technique known as FAHP. The results showed that “economic factors” are the main contributors to these imbalances, followed by several other factors. This study contributes a clear insight into the main factors that are causing the imbalances in cargo flows at large-scale minor ports in Malaysia. Also, it may assist decision-makers and policymakers in identifying the key factors that are affecting business operations at these ports as well as guide them into using a systematic analytical approach like the FAHP to evaluate other situations with regard to the business, operations and management of ports, where applicable.
Inga Wang,Mohammad H Rahman,Stephen Hou,Hui-Wen Lin 한국지질동맥경화학회 2023 지질·동맥경화학회지 Vol.12 No.3
Objective: Low-density lipoprotein-cholesterol (LDL-C) remains a clinically important cholesterol target in primary prevention of atherosclerotic cardiovascular disease. The present study aimed to assess the practical differences among three equations utilized for the estimation of LDL-C: the Friedewald, the Martin/Hopkins, and the NIH equation 2. Methods: Blood lipid measurements from 4,556 noninstitutionalized participants, aged 12 to 80, were obtained from the 2017-2020 National Health and Nutrition Examination Survey study. We 1) assessed the differences between three calculated LDL-C estimates, 2) examined the correlations between LDL-C estimates using correlation coefficients and regression, and 3) investigated the degree of agreement in classifying individuals into the LDL-C category using weighted Kappa and percentage of agreement. Results: The differences in LDL-C estimates between equations varied by sex and triglyceride levels (p<0.001). Overall, the mean of absolute differences between Friedewald and Martin/Hopkins was 3.17 mg/dL (median=2.0, 95% confidence interval [CI] [3.07–3.27]). The mean of absolute differences between Friedewald and NIH Equation 2 was 2.08 mg/dL (median=2.0, 95% CI [2.03–2.14]). Friedewald correlated highly with Martin/Hopkins (r=0.991, rho=0.989) and NIH Equation 2 (r=0.998, rho=0.997). Cohen’s weighted Kappa=0.92 between Friedewald and Martin/Hopkins, and 0.95 between Friedewald and NIH equation 2. The percentage of agreement in classifying individuals into the same LDL-C category was 93.0% between Friedewald and Martin/Hopkins, and 95.4% between Friedewald and NIH equation 2. Conclusion: Understanding the practical differences in LDL-C calculations can be helpful in facilitating decision-making during a paradigm shift.
Siham N. K. Al-Shaaibi,Mostafa I. Waly,Lyutha Al-Subhi,Mohamed H. Tageldin,Nada M. Al-Balushi,Mohammad S. Rahman 한국식품영양과학회 2016 Preventive Nutrition and Food Science Vol.21 No.1
Non-alcoholic fatty liver disease (NAFLD) is caused by fat accumulation and is associated with oxidative stress. In this study, we investigated the potential protective effect of pomegranate (Punica granatum L.) peel extract (PPE) against oxidative stress in the liver of rats with NAFLD. Sprague-Dawley rats were fed a high fat diet (HFD), 20% corn oil, or palm oil for 8 weeks in the presence or absence of PPE. The control group was fed a basal diet. The progression of NAFLD was evaluated histologically and by measuring liver enzymes (alanine transaminase and aspartate transaminase), serum lipids (triglycerides and total cholesterol), and oxidative stress markers. The HFD feeding increased the body weight and caused NAFLD, liver steatosis, hyperlipidemia, oxidative stress, and elevated liver enzymes. Administration of PPE ameliorated the hepatic morphology, reduced body weight, improved liver enzymes, and inhibited lipogenesis. Furthermore, PPE enhanced the cellular redox status in the liver tissue of rats with NAFLD. Our findings suggest that PPE could improve HFD-induced NAFLD via abolishment of hepatic oxidative damage and hyperlipidemia. PPE might be considered as a potential lead material in the treatment of NAFLD and obesity through the modulation of lipid metabolism.