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Search Results: 1 - 10 of 22869 matches for " Hung-Chang Hsia "
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Design of a Flow-through Polarographic Sensor Based on Metal Films for Determining N-nitrosodiethanolamine Levels in Rabbit Biological Fluids
Lai-Hao Wang,Hung-Chang Hsia,Yuan-Zhi Lan
Sensors , 2006, DOI: 10.3390/s6111555
Abstract: The construction and characterization of a flow-through polarographic detectorfor catalyzing the electroreduction of N-nitrosodiethanolamine (NDELA), is discussed. Theflow-through cell is equipped with a gold wire electrode (a thin mercury film deposited on agold substance). The response is evaluated with respect to substance diameter, length,concentration of modifying film, operating potential, supporting electrolyte and pH, andflow rate in the DC mode. The system allows the determination of N-nitrosodiethanolaminein rabbit biological fluids with relatively inexpensive equipment.
A Rokhlin type theorem for simple C*-algebras of finite nuclear dimension
Hung-Chang Liao
Mathematics , 2015,
Abstract: We study Z-actions on unital simple separable stably finite C*-algebras of finite nuclear dimension. Assuming that the trace space is a finite dimensional Bauer simplex, and that the induced action on the trace space is trivial, we show that strongly outer Z-actions have finite Rokhlin dimension in the sense of Hirshberg, Winter and Zacharias.
Secondary Aortoduodenal Fistula
Meng-Wei Chang,Yi-Ling Chan,Hung-Chang Hsieh,Shy-Shin Chang
Chang Gung Medical Journal , 2002,
Abstract: Secondary aortoenteric fistula (SAF) is now recognized as an uncommon but exceedinglyimportant complication of abdominal aortic reconstruction. The complication oftenoccurs months to years after the original surgery. The main clinical manifestation of the diseaseis always upper gastrointestinal bleeding. Treatment of the disease is early surgicalintervention. The mortality is high if no prompt operation. We present a case of secondaryaortoduodenal fistula (SADF) found 20 days after aortic reconstructive surgery, with theclinical presentation of upper gastrointestinal bleeding. Even immediate exploratory laparotomywas performed, the patient died 48 hrs after the surgical management. Because of theincreasing number of elective aortic aneurysm repairs in the aging population, it is likelythat more patients with SAF will present to the clinical physicians in the future. So, a highindex of suspicion is necessary for prompt diagnosis and treatment of this actually lifethreateningevent.
Possible roles of Epstein-Barr virus in Castleman disease
Chih-Hao Chen, Hung-Chang Liu, Tzu-Ti Hung, Tsang-Pai Liu
Journal of Cardiothoracic Surgery , 2009, DOI: 10.1186/1749-8090-4-31
Abstract: 20 cases of Castleman disease were retrospectively reviewed from 1993 to 2006. At least 2 to 4 representative sections of formalin-fixed, paraffin-embedded specimens from each patient were obtained to examine the presence of EBV and its localization by hematoxylin-eosin stain, immunohistochemistry, polymerase chain reaction and In-situ hybridizationHyaline-vascular type was diagnosed in 18 cases, plasma cell type in 1 and mixed type in 1 case. All of them were positive for Epstein-Barr virus confirmed by PCR. For tumors that EBER(Epstein-Barr early region) signals mainly localized in the germinal centers have increased vascularity than cases with EBER detected in inter-follicular areas.There is a strong association between Castleman disease and Epstein-Barr virus. EBV may have a potential role in angiogenesis of Castleman disease. For smaller lesion with high activity of angiogenesis but not amenable for curative resection, anti-angiogenesis medications may have a potential role to control the disease.Castleman disease (CD) is a rare and usually benign lymphproliferative disease. It has many synonyms, including giant lymph node hyperplasia, angiofollicular hyperplasia, lymph node harmatoma, benign giant lymphoma, and follicular lymphoreticuloma. Castleman et al first described it as a new disease entity in 1956[1]. Subsequently in 1972, Keller defined Castleman disease both clinically and histologically.[2] It has 2 clinical types, unicentric and multicentric and 3 histologic types, hyaline-vascular type, plasma cell type and mixed type. Because it is rare, the essence of the disease remained unclear in many aspects, including etiology, pathogenesis and long-term outcome. Some studies have suggested that some kinds of virus may be implicated in the pathogenesis of CD. Jones et al published 5 cases studied by immunohistochemistry, which indicated there might be possible roles for EBV or cytomegalovirus(CMV) in the pathogenesis of CD but this deduction was not support
Torsion of right middle lobe after a right upper lobectomy
Chih-Hao Chen, Tzu-Ti Hung, Tung-Ying Chen, Hung-Chang Liu
Journal of Cardiothoracic Surgery , 2009, DOI: 10.1186/1749-8090-4-16
Abstract: Resection of right upper lobe is a common procedure in patients with lung cancer. Infrequently, the fissure between the middle lobe and lower lobe is well developed so that torsion of the middle lobe might occur during or after an operation, especially when pneumopexy is not performed.A 50-year-old woman presented 2-month cough and mild symptoms of hemoptysis. On routine chest radiograph of regular health examination, the patient was found to have a mass measuring around 3.5 cm in greatest diameterin right upper lung field (Figure 1A). Subsequent bronchoscopic brushing cytology confirmed the mass to be malignant. 7 days after admission, the patient underwent lobectomy and radical lymph node dissection through a standard right posterolateral thoracotomy. The chest radiograph on postoperative day 1 and 2 showed adequate lung expansion with no obvious abnormality. 5 days after operation, the patient presented fever and mild dyspnea. Follow-up chest radiograph showed a wedge-shaped opacity of large area in the middle lung field (Figure 1B). Bedside bronchoscopy showed tight orifice of right middle lobe. CT scan showed collapse and hemorrhagic consolidation in right middle lobe (Figure 2). Under the impression of torsion, the patient underwent explorative thoracotomy. Under direct visualization, the right middle lobe was found to have a 720-degree counterclockwise torsion along the pedicle axis. An emergency lobectomy was performed. The patient was discharged 10 days after operation.Lobar torsion can occurred in traumatic, spontaneous and postoperative conditions. Its occurrence is quite rare [1]. Prompt diagnosis of the torsion is quite difficult and must be differentiated from sputum impaction and lobar pneumonia. Because of the other 2 conditions may response well to chest physical therapy and effective antibiotic therapy respectively. The physical findings, including fever, tachycardia, dyspnea and decreased breath sounds, are not specific to make a diagnosis. The ke
Brachiobasilic Fistula as a Secondary Access Procedure: An Alternative to a Dialysis Prosthetic Graft.
Chieh-Hung Lee,Po-Jen Ko,Yun-Hen Liu,Hung-Chang Hsieh
Chang Gung Medical Journal , 2004,
Abstract: Background: In order to extend the availability of each extremity as an access site forlong-term dialysis, we created a brachiobasilic fistula by superficialization ofthe basilic vein, which had previously been arterialized. In this work, we presentthe preliminary results of this procedure.Methods: Patients with prior forearm arteriovenous fistula dysfunction without an adequatesuperficial vein were enrolled in this study. The basilic vein was superficializedto create a brachiobasilic fistula. The basilic veins were transposedin 16 patients and elevated in 4 patients. At the same time, another 50 upperarm bridge prosthetic grafts were created. Finally, surgery-related complicationsand patency rates were analyzed and compared with upper arm prostheticgrafts.Results: Twenty brachiobasilic fistulas and 50 upper arm bridge prosthetic grafts werecreated in 70 patients in our hospital from September 2001 to January 2004.No surgery-related deaths occurred. Cannulation of the brachiobasilic fistulasbegan at an average of 33 (range, 21 to 84) days after surgery. All fistulaswere successfully used for dialysis. The mean follow-up was 15 (range, 2 to26) months. Moreover, the primary patency rates for the brachiobasilic fistulasand upper arm prosthetic grafts were 80% and 70%, respectively.Notably, all brachiobasilic fistulas remained patent at the last follow-up.Furthermore, surgery-related complications were 25% for brachiobasilic fistulasand 60% for upper arm prosthetic grafts. Common complications ofbrachiobasilic fistulas were graft thrombosis, arm swelling, hematoma formation,and steal syndrome.Conclusions: Brachiobasilic fistulas are technically feasible and show excellent patency.Fewer surgery-related complications were seen compared to upper arm prostheticgrafts, and most of them were treated without loss of the fistula. Wesuggest that this procedure should be considered before placement of a prostheticgraft whenever feasible. These observations merely represent our preliminaryexperience regarding this procedure, and further investigationinvolving larger cases numbers is needed in the future.
On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units
Kuei-Ping Shih,Der-Jiunn Deng,Ruay-Shiung Chang,Hung-Chang Chen
Sensors , 2009, DOI: 10.3390/s90705173
Abstract: The paper considers the connected target coverage (CTC) problem in wireless heterogeneous sensor networks (WHSNs) with multiple sensing units, termed MU-CTC problem. MU-CTC problem can be reduced to a connected set cover problem and further formulated as an integer linear programming (ILP) problem. However, the ILP problem is an NP-complete problem. Therefore, two distributed heuristic schemes, REFS (remaining energy first scheme) and EEFS (energy efficiency first scheme), are proposed. In REFS, each sensor considers its remaining energy and its neighbors’ decisions to enable its sensing units and communication unit such that all targets can be covered for the required attributes and the sensed data can be delivered to the sink. The advantages of REFS are its simplicity and reduced communication overhead. However, to utilize sensors’ energy efficiently, EEFS is proposed. A sensor in EEFS considers its contribution to the coverage and the connectivity to make a better decision. To our best knowledge, this paper is the first to consider target coverage and connectivity jointly for WHSNs with multiple sensing units. Simulation results show that REFS and EEFS can both prolong the network lifetime effectively. EEFS outperforms REFS in network lifetime, but REFS is simpler.
The adequacy of single-incisional thoracoscopic surgery as a first-line endoscopic approach for the management of recurrent primary spontaneous pneumothorax: a retrospective study
Chen Chih-Hao,Lee Shih-Yi,Chang Ho,Liu Hung-Chang
Journal of Cardiothoracic Surgery , 2012, DOI: 10.1186/1749-8090-7-99
Abstract: Background Thoracoscopic surgery is a commonly used endoscopic surgical treatment approach in patients with primary spontaneous pneumothorax. The conventional thoracoscopic approach utilizes three or more small wounds for surgery. Currently, a single port approach is a potential alternative procedure in general thoracoscopic surgery. We investigated whether a single-port approach is suitable as a first-line endoscopic approach for all patients with primary spontaneous pneumothorax requiring surgery. Methods From July 1st, 2008 to Dec 31, 2009, a total of 62 patients was included in this study. All the patients were admitted to our ward because they had surgical indications for surgery. Twenty-six patients underwent conventional three-port thoracoscopic surgery and thirty-six underwent single-port thoracoscopic surgery. All of the clinical data were analyzed retrospectively. Variables were compared and analyzed to determine the outcomes of the different surgical approaches. Results The mean age of the 62 patients was 27.2 years. Forty-nine patients were men and thirteen patients were women. The mean time required for the operation was 61.6 minutes. There was one patient who had a recurrence in single-port group and 2 patients had a recurrence in three-port group during the period of follow-up. The average pain scores at 24 and 48 hrs after the operation were similar, but the pain scores at 72 hrs in the single-port group were better than the three-port group. There was no case that required conversion from a single-port to multiple wound approach in this study. There was no immediate postoperative recurrence. The follow-up duration was greater than 12 months. Conclusion This study showed that single-port thoracoscopic surgery is a feasible and reasonable first-line endoscopic approach in the surgical treatment of primary spontaneous pneumothorax.
Photocatalytic Oxidation of Gaseous Isopropanol Using Visible-Light Active Silver Vanadates/SBA-15 Composite
Ting-Chung Pan,Hung-Chang Chen,Guan-Ting Pan,Chao-Ming Huang
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/314361
Abstract: An environmentally friendly visible-light-driven photocatalyst, silver vanadates/SBA-15, was prepared through an incipient wetness impregnation procedure with silver vanadates (SVO) synthesized under a hydrothermal condition without a high-temperature calcination. The addition of mesoporous SBA-15 improves the formation of nanocrystalline silver vanadates. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms the presence of Br?nsted and Lewis acids on the SVO/SBA-15 composites. The results of photoluminescence spectra indicated that the electron-hole recombination rate have been effectively inhibited when SVO was loaded with mesoporous SBA-15. All the composites loaded with various amount of SVO inherit the higher adsorption capacity and larger mineralization yield than those of P-25 (commercial TiO2) and pure SVO. The sample loaded with 51% of SVO (51SVO/SBA-15) with mixed phases of Ag4V2O7 and α-Ag3VO4 exhibits the best photocatalytic activity. A favorable crystalline phase combined with high intensities of Br?nsted and Lewis acids is considered the main cause of the enhanced adsorption capacity and outstanding photoactivity of the SVO/SBA-15 composites.
Distributed Overlay Formation in Heterogeneous Wireless Sensor Networks
Si-Yu Ou,Hung-Chang Hsiao,Chi-Kuo Chiang,Chung-Ta King
International Journal of Distributed Sensor Networks , 2007, DOI: 10.1080/15501320701202610
Abstract: The scale and functional complexity of future-generation wireless sensor networks will call for a non-homogeneous architecture, in which different sensors play different logical roles or functions, or have different physical capabilities in terms of energy, computing power, or network bandwidth. When sensors of the same group need to communicate with each other, their communications often have to pass through other sensors, thus forming an overlay on top of the wireless sensor network. The topology of the overlay is critical. It must have a low diameter to reduce the communication latency between those sensors. It also needs to avoid using other sensors for relaying the communications as much as possible, so as to preserve the energy of other sensors. In this paper, we propose a distributed overlay formation protocol taking account of the above factors. Through simulation, we compare our protocol with two overlay formation protocols, one that generates a fully connected topology and the other a minimum spanning tree. The results show that our protocol can achieve better performance both in message latency and energy consumption.
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