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Search Results: 1 - 10 of 3382 matches for " Tien Chih "
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Generalized Affine Programming & Duality Gap with non-Division Rings
Tien Chih
Mathematics , 2015,
Abstract: Classical primal-dual affine programming takes place over finite dimensional real vector spaces. This results in beautiful duality theory, connecting the optimal solu- tions of the primal maximization problem and the dual minimization problems. These results include the Existence Duality Theorem, which guarantees optimal solutions to any feasible bounded program; and the Strong Duality Theorem, which implies that optimal solutions for primal and dual programs must have the same objective value. In a common extension of classical affine programming, we see that the Strong Duality does not hold when ring of scalars is the integers. Extension of classical affine programming results to ordered division rings are explored in. In this paper, we describe the generalized setting of affine programming using ordered ring (not necessarily division), and classify the rings for which the Existence Duality Theorem or the Strong Duality Theorem fail.
Graphs and Their Associated Inverse Semigroups
Tien Chih,Demitri Plessas
Mathematics , 2015,
Abstract: Directed graphs have long been used to gain understanding of the structure of semigroups, and recently the structure of directed graph semigroups has been investigated resulting in a characterization theorem and an analog of Fruct's Theorem. We investigate four inverse semigroups defined over undirected graphs constructed from the notions of subgraph, vertex induced subgraph, rooted tree induced subgraph, and rooted path induced subgraph. We characterize the structure of the semilattice of idempotents and lattice of ideals of these four inverse semigroups. Finally, we prove a characterization theorem that states that every graph has a unique associated inverse semigroup up to isomorphism.
A Novel pH-dependent Drift Improvement Method for Zirconium Dioxide Gated pH-Ion Sensitive Field Effect Transistors
Kow-Ming Chang,Chih-Tien Chang,Kuo-Yi Chao,Chia-Hung Lin
Sensors , 2010, DOI: 10.3390/s100504643
Abstract: A novel compensation method for Zirconium dioxide gated Ion Sensitive Field Effect Transistors (ISFETs) to improve pH-dependent drift was demonstrated. Through the sequential measurements for both the n-channel and p-channel ISFETs, 75–100% pH-dependent drift could be successfully suppressed for the first seven hours. As a result, a nearly constant drift rate versus pH value was obtained, which increases the accuracy of pH measurements. Meanwhile, the drawback of the hyperbolic-like change with time of the common drift behavior for ISFETs was improved. A state-of-the-art integrated scheme adopting this method was also illustrated.
Development of an Ion Sensitive Field Effect Transistor Based Urea Biosensor with Solid State Reference Systems
Kow-Ming Chang,Chih-Tien Chang,Kun-Mou Chan
Sensors , 2010, DOI: 10.3390/s100606115
Abstract: Ion sensitive field-effect transistor (ISFET) based urease biosensors with solid state reference systems for single-ended and two-ended differential readout electronics were investigated. The sensing membranes of the biosensors were fabricated with urease immobilized in a conducting polymer-based matrix. The responses of 12.9~198.1 mV for the urea concentrations of 8~240 mg/dL reveal that the activity of the enzyme was not significantly decreased. Biosensors combined with solid state reference systems were fabricated, and the evaluation results demonstrated the feasibility of miniaturization. For the differential system, the optimal transconductance match for biosensor and reference field-effect transistors (REFET) pair was determined through the modification of the membranes of the REFETs and enzyme field-effect transistors (EnFETs). The results show that the transconductance curve of polymer based REFET can match with that of the EnFET by adjusting the photoresist/NafionTM ratio. The match of the transconductance curves for the differential pairs provides a wide dynamic operating measurement range. Accordingly, the miniaturized quasi-reference electrode (QRE)/REFET/EnFET combination with differential arrangement achieved similar urea response curves as those measured by a conventional large sized discrete sensor.
The absorption and uptake of recombinant human follicle-stimulating hormone through vaginal subcutaneous injections - a pharmacokinetic study
Chao-Chin Hsu, Hsin-Chih Kuo, Chao-Tien Hsu, Qing Gu
Reproductive Biology and Endocrinology , 2009, DOI: 10.1186/1477-7827-7-107
Abstract: Twelve healthy women with regular ovulatory cycles were recruited. All volunteers received gonadotrophin-releasing hormone agonist to suppress pituitary function and were assigned to receive single dose recombinant human FSH (rhFSH, Puregon 300) either using conventional abdominal subcutaneous injection or vaginal subcutaneous injection in a randomized cross-over study. Serum samples were collected at pre- scheduled time intervals after injections of rhFSH to determine immunoreactive FSH levels. Pharmacokinetic parameters characterizing rate [maximal plasma concentrations (Cmax) and time of maximal plasma concentrations (tmax)] and extent [area under the plasma concentration-time curve (AUC) and clearance] of absorption of rhFSH were compared.Vaginal injection of rhFSH was well tolerated and no drug-related adverse reaction was noted. Our analysis revealed that tmax was significantly earlier (mean 6.67 versus 13.33 hours) and Cmax was significantly higher (mean 17.77 versus 13.96 IU/L) in vaginal versus abdominal injections. The AUC0-∞ was 1640 versus 1134 IU·hour/L in vaginal and abdominal injections, respectively. Smaller plasma elimination rate constant (0.011 versus 0.016 hour-1), longer mean residence time (106.58 versus 70.47 hours), and slower total body clearance (292.2 versus 400.1 mL/hour) were also found in vaginal injection.The vaginal injection mode elicited a rapid and highly extended absorption of rhFSH injected compared to conventional abdominal injection. These data indicate that the rate and extent of FSH absorption from the injection site can vary depending on the route of the FSH administration.Follicle stimulating hormone (FSH) has been widely employed for ovulation induction and in-vitro fertilization. The ability of FSH to promote folliculogenesis is dependent on the plasma level of FSH that develops after administration [1-3]. The relatively short elimination half-life and rapid metabolic clearance of current FSH preparations requires that da
Thoracic aorta pseudoaneurysm with hemopericardium: unusual presentation of warfarin overdose
Ya-Chih Tien, Ying-Cheng Chen, Chiung-Ying Liao, Chia-Chu Chang
Journal of Occupational Medicine and Toxicology , 2011, DOI: 10.1186/1745-6673-6-12
Abstract: A patient with a pseudoaneurysm will typically have had a traumatic event such as a recent blunt or penetrating trauma, or an endovascular procedure[1,2]. Heart failure and chest pain are the most common manifestations of a pseudoaneurysm of the ascending aorta[3]. Herein we report the case of a female receiving warfarin whose international normalized ratio (INR) was >10, who presented with dyspnea. Chest computed tomography (CT) revealed an aortic arch pseudoaneurysm and a fluid collection suggesting blood in the pericardium. We discuss the risk of bleeding as it is related to warfarin overdose and pseudoaneurysm leakage.A 78-year-old female, presenting with progressive shortness of breath and general weakness was admitted to our hospital on March 15, 2010. She experienced palpitations and tachycardia, and mild chest tightness when palpitations occurred. Her history was significant for primary cancer of the appendix with ovarian metastases, and was status post a debunking operation in December of 2006, complicated by chronic right leg lymphedema. She had been taking warfarin as prescribed by the cardiovascular surgery department for deep vein thrombosis of the right leg.On admission, her blood pressure was 148/96 mmHg, heart rate 114 beats/min, respiratory rate 26 breaths/min, and temperature 37.8°C. Laboratory studies revealed: white blood cell (WBC) count, 17200/uL (neutrophil-segment 89.1%); hemoglobin, 7.6 gm/dL; platelet count, 455000/uL; NT-proBNP, 6776 pg/mL; PT, 143s (INR >10); blood urea nitrogen (BUN), 33 mg/dL; creatinine, 0.77 mg/dL; Na 131 mmol/L; K 2.5, mmol/L; Ca 8.4 mg/dL; Mg, 2.4 mg/dL; and albumin 1.7 g/dL. The thyroid function tests were normal. Artery gas analysis showed hypoxia (pH, 7.4; PCO2, 36.9 mm Hg; PO2, 75.7 mm Hg; HCO3, 23.4 mmol/L; SaO2, 95%). The elevated PT and INR suggested warfarin overdose. We prescribed VitK1 1 ample per-12h and transfused frozen fresh plasma 12 units per-day. Three days later, the PT was normalized, 21s (INR2.0)
Electrolysis of nano-Silver Suspension into Ionic Form via Membrane Electro-Osmosis Process
Kuo Hsiung Tseng,Chih Yu Liao,Der Chi Tien,Tsing Tshih Tsung
Lecture Notes in Engineering and Computer Science , 2008,
A Study to Compare the Properties of Nano-Gold Suspension Fabricated by Spark Discharge System in Different Dielectric Media
Der Chi Tien,Kuo Hsiung Tseng,Chih Yu Liao,Jen-Chuen Huang
Lecture Notes in Engineering and Computer Science , 2008,
Web-based Collaborative learning in secondary education: Teachers’ reflection
Hsi-Chi Hsiao,Chih-Feng Chuang,Tien-Chu Huang,Chien-Feng Wu
International Journal of Cyber Society and Education , 2010,
Abstract: This article is based on the researchers’ reflections after twice participating in a Web-based Collaborative Learning Program Contest. The contests were held by Asia-Pacific Economic Cooperation (APEC) Cyber Academy (ACA). In collaborative learning, teachers are expected to provide participants with scaffolding assistance. The ACA is designed to provide student-centered activities for enhancing skills in information and communication technologies. Students are expected to find data, prepare presentations, and report their topics in English to communicate with other teams from other countries. During these processes, the researcher tried to apply theoretical models such as computerized instruction and topic based learning. The results of this study show the various benefits of Web-based Collaborative Learning for students and teachers. This study also includes several recommendations for primary and secondary schools.
Synthesis and Characterization of a Gel-Type Electrolyte with Ionic Liquid Added for Dye-Sensitized Solar Cells
Le-Yan Shi,Tien-Li Chen,Chih-Hao Chen,Kun-Ching Cho
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/834184
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