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Search Results: 1 - 10 of 7743 matches for " Jau-Chung Hwang "
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Multiple bowel intussusceptions from metastatic localized malignant pleural mesothelioma: A case report
Hsien Liu, Yu-Jen Cheng, Hsin-Pao Chen, Jau-Chung Hwang, Po-Chih Chang
World Journal of Gastroenterology , 2010,
Abstract: Localized malignant pleural mesothelioma (LMPM) is a rare occurrence, and gastrointestinal intra-luminal metastases have not previously been reported. Herein, we report a patient with LMPM who presented with a local recurrence 10 mo after initial en bloc surgical resection. Abdominal computed tomography was performed for intractable, vague abdominal pain with episodic vomiting, which showed a “target sign” over the left lower quadrant. Laparotomy revealed several intra-luminal metastatic tumors in the small intestine and colon and a segmental resection of metastatic lesions was performed. Unfortunately, the patient died of sepsis despite successful surgical intervention. Though local recurrence is more frequent in LMPM, the possibility of distant metastasis should not be ignored in patients with non-specific abdominal pain.
Complete residue systems in the ring of matrices of rational integers
Jau-Shyong Shiue,Chie-Ping Hwang
International Journal of Mathematics and Mathematical Sciences , 1978, DOI: 10.1155/s0161171278000253
Abstract: This paper deals with the characterizations of the complete residue system mod. ¢ € ‰ ¢ € ‰ ¢ € ‰G, where G is any n —n matrix, in the ring of n —n matrices.
Mathematical Modeling of the Actual Infiltration Process for the Preparation of C/C Composites  [PDF]
Gui Yung Chung, Dong Geun Hwang, Sung Soo Hong
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.412A117
Abstract:

The mathematical modeling for the preparation of C/C composites from propane by F-CVI (Forced-flow Chemical Vapor Infiltration) was studied. The modeling for the actual processes including overturning the preform in the middle of the deposition process was carried out. Effects of the interval and the number of overturning processes on the time changes of porosity distribution were observed. The actual deposition process could be continued longer by overturning the preform. Furthermore, the total amount of deposition increased twice when several times of overturning were applied. It was confirmed that a low concentration and a slow reaction rate are necessary for a uniform infiltration even when the preform is overturned in the middle of the process.

The X-ray Properties of the Energetic Pulsar PSR J1838-0655
Lupin Chun-Che Lin,Jumpei Takata,Chorng-Yuan Hwang,Jau-Shian Liang
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.15468.x
Abstract: We present and interpret several new X-ray features of the X-ray pulsar PSR J1838-0655. The X-ray data are obtained from the archival data of CHANDRA, RXTE}, and SUZAKU. We combine all these X-ray data and fit the spectra with different models. We find that the joint spectra are difficult to fit with a single power law; a broken power-law model with a break at around 6.5 keV can improve the fit significantly. The photon index changes from $\Gamma$ = 1.0 (below 6.5 keV) to $\Gamma$ = 1.5 (above 6.5 keV); this indicates a softer spectral behaviour at hard X-rays. The X-ray flux at 2-20 keV is found to be 1.6x10^{-11} ergs cm^{-2} s^{-1}. The conversion efficiency from the spin-down luminosity is ~ 0.9% at 0.8-10 keV, which is much higher than that (~ 10^{-3}% - 10^{-4}%) of the pulsars that show similar timing properties. We discuss non-thermal radiation mechanisms for the observed high X-ray conversion efficiency and find that emission from the magnetosphere of a greatly inclined rotator is the most favorable interpretation for the conversion rate and the pulse profiles at X-ray bands. A line feature close to 6.65 keV is also detected in the spectra of SUZAKU/XIS; it might be the K$_\alpha$ emission of highly ionised Fe surrounding the pulsar.
Modeling and Analysis of Energy Conservation Scheme Based on Duty Cycling in Wireless Ad Hoc Sensor Network
Yun Won Chung,Ho Young Hwang
Sensors , 2010, DOI: 10.3390/s100605569
Abstract: In sensor network, energy conservation is one of the most critical issues since sensor nodes should perform a sensing task for a long time (e.g., lasting a few years) but the battery of them cannot be replaced in most practical situations. For this purpose, numerous energy conservation schemes have been proposed and duty cycling scheme is considered the most suitable power conservation technique, where sensor nodes alternate between states having different levels of power consumption. In order to analyze the energy consumption of energy conservation scheme based on duty cycling, it is essential to obtain the probability of each state. In this paper, we analytically derive steady state probability of sensor node states, i.e., sleep, listen, and active states, based on traffic characteristics and timer values, i.e., sleep timer, listen timer, and active timer. The effect of traffic characteristics and timer values on the steady state probability and energy consumption is analyzed in detail. Our work can provide sensor network operators guideline for selecting appropriate timer values for efficient energy conservation. The analytical methodology developed in this paper can be extended to other energy conservation schemes based on duty cycling with different sensor node states, without much difficulty.
Arsenic burden survey among refuse incinerator workers
Chao Chung-Liang,Hwang K
Journal of Postgraduate Medicine , 2005,
Abstract: Background: Incinerator workers are not considered to have arsenic overexposure although they have the risk of overexposure to other heavy metals. Aim: To examine the relationship between arsenic burden and risk of occupational exposure in employees working at a municipal refuse incinerator by determining the concentrations of arsenic in the blood and urine. Settings and Design: The workers were divided into three groups based on their probability of contact with combustion-generated residues, namely Group 1: indirect contact, Group 2: direct contact and Group 3: no contact. Healthy age- and sex-matched residents living in the vicinity were enrolled as the control group. Materials and Methods: Heavy metal concentrations were measured by atomic absorption spectrophotometer. Downstream rivers and drinking water of the residents were examined for environmental arsenic pollution. A questionnaire survey concerning the contact history of arsenic was simultaneously conducted. Statistical analysis: Non-parametric tests, cross-tabulation and multinomial logistic regression. Results: This study recruited 122 incinerator workers. The urine and blood arsenic concentrations as well as incidences of overexposure were significantly higher in the workers than in control subjects. The workers who had indirect or no contact with combustion-generated residues had significantly higher blood arsenic level. Arsenic contact history could not explain the difference. Airborne and waterborne arsenic pollution were not detected. Conclusion: Incinerator workers run the risk of being exposed to arsenic pollution, especially those who have incomplete protection in the workplace even though they only have indirect or no contact with combustion-generated pollutants.
On the Fundamental Limits of Interweaved Cognitive Radios
G. Chung,S. Vishwanath,C. S. Hwang
Mathematics , 2009,
Abstract: This paper considers the problem of channel sensing in cognitive radios. The system model considered is a set of N parallel (dis-similar) channels, where each channel at any given time is either available or occupied by a legitimate user. The cognitive radio is permitted to sense channels to determine each of their states as available or occupied. The end goal of this paper is to select the best L channels to sense at any given time. Using a convex relaxation approach, this paper formulates and approximately solves this optimal selection problem. Finally, the solution obtained to the relaxed optimization problem is translated into a practical algorithm.
Cost-Benefit Analysis of Screening for Gallstone Disease among Chinese Population in Taiwan
Jau-Yuan Chen,Shih-Tzer Tsai,Chung-Te Hsu,Jorn-Hon Liu
Open Access Journal of Science and Technology , 2013, DOI: 10.11131/2013/100002
Abstract: Purpose: To explore whether it is worthwhile to launch a routine gallstone disease screening for cholecystectomy prevention among Chinese population from different perspective in Taiwan. Methods: The study cohort was conducted with a total of 2,386 healthy adults voluntarily admitted to a teaching hospital for a physical check-up in 2002 in Taiwan. Annual follow-up screenings of gallstone disease then were until 31 December, 2007. The cost-benefit analysis tool of screening for gallstone disease is based on TreeAge software for medical decision analysis. A decision analysis using the Markov Decision Model was constructed to compare different screening regimes for gallstone disease. Results: In terms of benefit-cost ratio, the different screening programs for gallstone disease could save New Taiwan Dollars (NTD) from 19.61 to 63.41 in discounted costs for each dollar incurred in different screening years from the societal viewpoint for Taiwan and save NTD from 2.89 to 4.71 in different screening years from health care payer's perspective. The average estimate of willingness-to-pay to translate into benefit yields NTD from 807.8 to 4,039 benefits per case due to gallstone disease screening in different screening years during 10-year follow-up. The net present value of the gallstone disease screening were NTD from -133,736 to -217,689.2 in different screening years. Conclusion: It is worthwhile to initial a routine gallstone disease screening of Chinese population for cholecystectomy prevention from the societal perspective but not from consumer decision based on the willingness-to-pay perspective.
Concurrent exposure to a dectin-1 agonist suppresses the Th2 response to epicutaneously introduced antigen in mice
Lin Jing-Yi,Chen Jau-Shiuh,Chen Pei-Chun,Chung Ming-Hui
Journal of Biomedical Science , 2013, DOI: 10.1186/1423-0127-20-1
Abstract: Background Epicutaneous sensitization with protein allergen that induces predominant Th2 responses is an important sensitization route in atopic dermatitis. Fungal components have been shown to modulate Th cell differentiation. However, the effects of fungal components on epicutaneous sensitization are unclear. Results In this study, we showed that co-administration of curdlan, a dectin-1 agonist, during epicutaneous ovalbumin sensitization of BALB/c mice decreased the IL-5 and IL-13 levels in supernatants of lymph node cell ovalbumin reactivation cultures. Mechanistically, curdlan co-administration decreased IL-4 and IL-1β expressions in draining lymph nodes. Curdlan co-administration also lower the migration of langerin+ CD103- epidermal Langerhans cells into draining lymph nodes at 96 hours post-sensitization which might be attributed to decreased expressions of IL-18 and IL-1β in patched skin. Moreover, adoptive transfer of CFSE-labeled transgenic CD4 T cells confirmed that curdlan co-administration decreased the proliferation and IL-4-production of ovalbumin -specific T cells primed by epidermal Langerhans cells. Conclusions These results indicated that concurrent exposure to a dectin-1 agonist suppresses the epicutaneously induced Th2 response by modulating the cytokine expression profiles in draining LNs and the migration of epidermal Langerhans cells. These results highlight the effects of fungal components on epicutaneous allergen sensitization in atopic diseases.
Closed Femoral Nailing in Lateral Decubitus Position without a Fracture Table: A Preliminary Report of Fifteen Patients
Hsien-Tao Liu,I-Chun Wang,Chung-Ming Yu,Jau-Wen Huang
Chang Gung Medical Journal , 2005,
Abstract: Background: The use of a fracture table is standard for closed intramedullary nailing offemoral fractures. Instead of a fracture table, some clinicians have successfullyperformed this operation in the supine position via manual traction.Here, we present our experience performing this operation in the lateraldecubitus position without a fracture table.Methods: From December 2001 to November 2002, we consecutively performedclosed intramedullary femoral nailing in 15 patients with low comminutedfemoral shaft fractures in the lateral decubitus position without a fracturetable. We used manual or joystick traction to approximate the fracture fragmentsand introduced a guide pin. A reaming procedure was done with serialreamers of increasing diameters to reduce the fracture fragments. Then, thenail was inserted along the guide pin.Results: Six femora underwent Küntscher nailing and nine femora underwent interlockingnailing. Nine procedures were completed via joystick traction andsix were completed via manual traction only. All fifteen procedures werecompleted without any changes in the other operative methods. The meanoperation time was 55 minutes for Küntscher nailing and 118.3 minutes forinterlocking nailing. The average union time was 5.8 months with 100%union.Conclusions: For low comminuted femoral shaft fractures, using manual or joystick tractionin the lateral decubitus position without a fracture table is an alternativein closed femoral intramedullary nailing.
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