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Kluwer Academic Publishers 2016 WIRELESS PERSONAL COMMUNICATIONS Vol. No.
<P>A transmission failure is caused by either signal attenuation, interference or both in wireless networks. Identification of such cause helps understanding of the current status of a wireless channel and network, thus providing essential information for optimizing the behavior of each network node as well as the operation of the whole network. In this paper, we propose a scheme to classify transmission failures in the receiver side (thus necessitating no change of existing protocols); the scheme detects an anomaly of the receive power pattern observed during an interference period and classify transmission events with the aid of a modem's decoding result. The feasibility of the scheme is shown via a real experiment with its SDR implementation based on IEEE 802.15.4 ZigBee.</P>
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Chuah, Chong Yang,Li, Wen,Samarasinghe, S.A.S.C.,Sethunga, G.S.M.D.P.,Bae, Tae-Hyun Elsevier 2019 Microporous and mesoporous materials Vol.290 No.-
<P><B>Abstract</B></P> <P>HKUST-1 nanocrystals with large accessible surface areas and high porosity were functionalized with amine groups and incorporated into polymer matrices to form mixed-matrix membranes for application in CO<SUB>2</SUB> capture. This gas permeation study reveals that pristine HKUST-1 nanocrystals are able to increase the gas permeabilities of polymer membranes with no noticeable effect on CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity as a result of their high porosity and large pore dimensions. Contrarily, 20 wt% amine-functionalized HKUST-1 can improve the CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity of polymer membranes by as much as 38%. As shown in a detailed analysis of the diffusivity-solubility, the amine-functionalized HKUST-1 suppressed N<SUB>2</SUB> solubility and diffusivity but enhanced CO<SUB>2</SUB> diffusivity. This resulted in an increased CO<SUB>2</SUB>/N<SUB>2</SUB> perm-selectivity. Meanwhile, the pristine HKUST-1 nanocrystals increased the diffusivity and solubility of both species in a non-selective manner. These results indicate the feasibility of tuning the CO<SUB>2</SUB> separation performance of mixed-matrix membranes by introducing amine functionality into the filler.</P> <P><B>Highlights</B></P> <P> <UL> <LI> HKUST-1 and amine-functionalized HKUST-1 nanocrystals were successfully synthesized. </LI> <LI> HKUST-1 nanocrystals improved CO<SUB>2</SUB> permeability with no effect on CO<SUB>2</SUB> selectivity. </LI> <LI> Amine-functionalized HKUST-1 enhanced CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity and CO<SUB>2</SUB> permeability. </LI> <LI> Amine-functionalized HKUST-1 suppressed N<SUB>2</SUB> solubility and diffusivity substantially. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Primary pleomorphic liver liposarcoma: A case series and literature review
Chuah Jun Sen,Siaw Jia Yng,Soon Koon Choon,Fatin Izni Zamri 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.3
Primary hepatic liposarcoma is an extremely rare mesenchymal tumor that accounts for only 0.1% to 2% of primary malignant liver tumors. Due to its rarity, there is a lack of knowledge about its clinical course, management, and prognosis. Only 15 cases of primary liposarcoma of the liver have been reported since 1973. Among these 15 cases, only two involved primary liver liposarcoma with a pleomorphic subtype. Here we report the third and fourth cases of primary pleomorphic liver liposarcoma. A 57-year-old female presented with abdominal discomfort and progressive abdominal distension for two weeks. Computed tomography (CT) of her abdomen revealed a large well-defined solid nodule mass with an area of necrosis and hemorrhage occupying segment IV-B of the liver. Wide local excision was performed. She had an uneventful recovery and remained well at six months post-treatment. A 65-year-old male presented with an abdominal mass for two-month. CT demonstrated a mass in the left lobe of the liver with mixed soft tissues and fat attenuation. He underwent wide local excision. He was discharged on day three postoperatively. Histological analysis for both cases revealed liposarcoma of the liver with a pleomorphic subtype.
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Chuah Tyng Yu,Lim Chun Yee,Tan Rui Zhen,Pratumvinit Busadee,Loh Tze Ping,Vasikaran Samuel,Markus Corey 대한진단검사의학회 2023 Annals of Laboratory Medicine Vol.43 No.5
Functional reference limits describe key changes in the physiological relationship between a pair of physiologically related components. Statistically, this can be represented by a significant change in the curvature of a mathematical function or curve (e.g., an observed plateau). The point at which the statistical relationship changes significantly is the point of curvature inflection and can be mathematically modeled from the relationship between the interrelated biomarkers. Conceptually, they reside between reference intervals, which describe the statistical boundaries of a single biomarker within the reference population, and clinical decision limits that are often linked to the risk of morbidity or mortality and set as thresholds. Functional reference limits provide important physiological and pathophysiological insights that can aid laboratory result interpretation. Laboratory professionals are in a unique position to harness data from laboratory information systems to derive clinically relevant values. Increasing research on and reporting of functional reference limits in the literature will enhance their contribution to laboratory medicine and widen the evidence base used in clinical decision limits, which are currently almost exclusively contributed to by clinical trials. Their inclusion in laboratory reports will enhance the intellectual value of laboratory professionals in clinical care beyond the statistical boundaries of a healthy reference population and pave the way to them being considered in shaping clinical decision limits. This review provides an overview of the concepts related to functional reference limits, clinical examples of their use, and the impetus to include them in laboratory reports.
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Enhanced SF<sub>6</sub> recovery by hierarchically structured MFI zeolite
Chuah, Chong Yang,Yu, Suyeon,Na, Kyungsu,Bae, Tae-Hyun Elsevier 2018 Journal of industrial and engineering chemistry Vol.62 No.-
<P><B>Abstract</B></P> <P>A hierarchical zeolite MFI has been synthesised and investigated for its potential feasibility in SF<SUB>6</SUB>/N<SUB>2</SUB> separation. Zeolite MFI possessing a hierarchical microporous–mesoporous structure (MFI-2) displayed an enhanced SF<SUB>6</SUB>/N<SUB>2</SUB> selectivity at 40°C as compared to bulk MFI (MFI-1). More importantly, at both 25 and 40°C, drastically improved SF<SUB>6</SUB> adsorption kinetics were observed for MFI-2, owing to the presence of mesopores that can facilitate the transport of SF<SUB>6</SUB> within the sorbent. Such improved adsorption kinetics allows a rapid adsorption–desorption cycling in an industrial process, which was proven by the breakthrough analysis. Furthermore, MFI-2 was found to have a much lower isosteric heat of adsorption than MFI-1, indicating its feasibility in the industrial operation as it does not require a large energy penalty for regeneration. Further evaluation with an idealised vacuum swing adsorption (VSA) model revealed that MFI-2 can exhibit more competitive performance at 40°C than at room temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zeolite MFI crystal with hierarchical structure was successfully synthesised. </LI> <LI> Hierarchical zeolite MFI (MFI-2) displayed enhanced SF<SUB>6</SUB> adsorption kinetics as compared to bulk MFI (MFI-1). </LI> <LI> MFI-2 showed lower isosteric heat of adsorption than MFI-1, thus allowing a lower energy penalty for adsorptive separation process. </LI> <LI> The MFI-2 exhibited a competitive performance in an idealised VSA model at 40°C. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Sensor-Based Medical Information System (SBMIS)
M. Chuah,F,Fu,P. Yang 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.2
Recently, wireless sensor networks have been proposed for assisted living and residential monitoring. In such networks, physiological sensors are used to monitor vital signs e.g. heartbeats, pulse rates, oxygen saturation of senior citizens. Sensor data is sent periodically via wireless links to a personal computer that analyzes the data. In this paper, we first describe the architecture of a sensor-based medical information system that we are developing. Then, we describe how we deal with security issues in our system. Next, we describe an ECG anomaly detection scheme that we proposed. Our approach is based on time series analysis that will allow the computer to determine whether a stream of real-time sensor data contains any abnormal heartbeats. If anomaly exists, that time series segment will be transmitted via the network to a physician so that he/she can further diagnose the problem and take appropriate actions. When tested against the heartbeat data readings stored at the MIT database, our ECG anomaly scheme is shown to have better performance than another scheme that has been recently proposed. Our scheme enjoys an accuracy rate that varies from 70-90% while the other scheme has an accuracy that varies from 40-70%.
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Numerical Simulation of Dust Cake Build-up in Rigid Ceramic Filters
Guan, Chuah Teong,Seville, J. P. K. 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.3
Periodically regenerable cake-forming filters are used to separate particles from gases having high dust concentrations, whereby the separation arises as the dust-gas mixture passes through the filter medium and the particles are retained. During the build-up of the filter cake, the pressure drop over the filter increases, making regeneration of the filter medium indispensable. The regeneration is performed at a defined maximum pressure drop across the filter and, after regeneration, the next filtration cycle starts and a new dust filter cake is built-up on the cleaned filter medium. The residual pressure drop is a measure of the dust remaining in the depth of the filter medium. Unfortunately, it quite often happens that the residual pressure drop does not reach a constant value after several filtration cycles, but increases steadily as a result of the fact that not all of the filter cake is removed by cleaning. This paper presents a mathematical model that is capable of simulating the time-dependent build-up of dust filter cakes, on the surface of filter, and includes calculations of the corresponding pressure drop and the thickness of the filter cake that formed during the filtration.
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