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Arthit Hongsri,Wajaree Weera,Thongchai Botmart,Prem Junsawang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.12
This article focuses on the stability problem of sampled-data systems, which is addressed using a new integral inequality. A method for systematic analysis is presented, then applied to the electric power market. The sampling point from tk to tk+1 assume to be a sampling interval but bounded. In addition, we develop a novel closed-loop Lyapunov functional that considers intervals from the sampling point t to tk and from t to tk+1. This new functional is utilized to derive a stability criterion that is less conservative than previous works based on novel integral inequalities for sampled-data systems. Numerical examples are proposed to demonstrate the efficacy and decreased conservatism of the suggested approach. Additionally, the method addresses the stability issue in electric power markets and explores the importance of reducing conservatism.
Suppression of CO on methanol decomposition over SnO2 catalysts
Arthit Neramittagapong,Sutasinee Neramittagapong,Nurak Grisdanurak 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.4
Methanol conversion was studied in the temperature range 350–400 8C at atmospheric pressure over a SnO2 catalyst. The results show SnO2 catalyzed methanol conversion to form methane, carbon dioxide and hydrogen selectively. This suggests that formaldehyde was an intermediate in producing methyl formate, which readily decomposed into methane and carbon dioxide. Both activity and selectivity were found to be independent on the specific surface area. The deactivation of the catalyst at high temperature was attributed to the decrease of surface area by formation of metallic tin.
Chairoungdua, Arthit,Iribe, Yuji,Kanai, Yoshikatsu,Endou, Hitoshi,Aisaki, Ken-ichi,Larashi, Katsuhide,Kanno, Jun,Baniasadi, Shadi 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.4
Inhibition of LAT1 (L-type amino acid transporter 1 ) activity in tumor cells could be effective in the inhibition of tumor cell growth by depriving tumor cells of essential amino acids. Because of the high level of expression of LAT1 in tumor cells, LAT1 inhibitors would be useful for anticancer therapy in suppressing tumor growth without affecting normal tissues. In recent years, cDNA microarray technique is useful technology for anticancer drug development. It allows identifying and characterizing new targets for developments in cancer drug therapy through the understanding genes involved in drug action. The present study was designed to investigate gene expression profile induced by LAT1 inhibitor using gene chip technology. Human bladder carcinoma cells (T24 cells) were treated with classical system L inhibitor 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH). Gene chip experiment was applied for treated and untreated cells after 3 and f2 h. Two independent experiments with a high degree of concordance identified the altered expression of 151 and 200 genes after 3 and 12 h BCH treatment. Among these genes, 132 and 13 were up-regulated and 19 and 187 were down-regulated by 3 and 12 h BCH treatment respectively. We found that BCH affected the expression of a large number of genes that are related to the control of cell survival and physiologic behaviors. These data are useful for understanding of intracellular signaling of cell growth inhibition induced by LAT1 inhibitors as candidate for anticancer drug therapy.
Scalable-Delay-Insensitive Optimization based on Lock Relation
Pitchayapatchaya Srikram,Arthit Thongtak 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper presents further studies on Scalable-Delay-Insensitive (SDI) optimization, an approach to revise Signal Transition Graph (STG) in order to relieve a restricted and pessimistic delay model for asynchronous control circuit synthesis. This paper extends the new algorithm based on the lock relation which analyze a causal relation to determine the signal transitions to be optimized and their safeness properties in case the STG has multiple tokens of initial marking. The proposed algorithm can be satisfied to properties of STG. Furthermore, it is not only performed to single cycle signal but also to multiple cycle signal STGs. As the results, our method can reduce the overhead from original STG used and implement the circuits which operate correctly.
Vorachai Sirikulchayanonta,Arthit Jinawath,Suphaneewan Jaovisidha 대한영상의학회 2010 Korean Journal of Radiology Vol.11 No.6
An epithelioid hemangioma involving three contiguous bones in continuity has, to the best of our knowledge, not been reported in the literature. A case of a 48-year-old man presented with radiating pain to the lower thoracic region for two years. A radiograph and CT scan revealed both permeative osteolytic and multiple trabeculated lesions involving the left posterior part of the 10th rib as well as the 9th and 10th vertebral bodies in continuity and was misled as a malignant or infectious lesion. The histopathology and immuno-histochemistry of the lesion confirmed the diagnosis of an epithelioid hemangioma. The lesion was still stable as of three years after surgery.
Shadi Baniasadi,Arthit Chairoungdua,Yuji Iribe,Yoshikatsu Kanai,Hitoshi Endou,Ken-ichi Aisaki,Katsuhide Igarashi,Jun Kanno 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.4
Inhibition of LAT1 (L-type amino acid transporter 1) activity in tumor cells could be effective in the inhibition of tumor cell growth by depriving tumor cells of essential amino acids. Because of the high level of expression of LAT1 in tumor cells, LAT1 inhibitors would be useful for anticancer therapy in suppressing tumor growth without affecting normal tissues. In recent years, cDNA microarray technique is useful technology for anticancer drug development. It allows identifying and characterizing new targets for developments in cancer drug therapy through the understanding genes involved in drug action. The present study was designed to investigate gene expression profile induced by LAT1 inhibitor using gene chip technology. Human bladder carcinoma cells (T24 cells) were treated with classical system L inhibitor 2-aminobicyclo-(2, 2, 1)-heptane-2-carboxylic acid (BCH). Gene chip experiment was applied for treated and untreated cells after 3 and 12 h. Two independent experiments with a high degree of concordance identified the altered expression of 151 and 200 genes after 3 and 12 h BCH treatment. Among these genes, 132 and 13 were up-regulated and 19 and 187 were down-regulated by 3 and 12 h BCH treatment respectively. We found that BCH affected the expression of a large number of genes that are related to the control of cell survival and physiologic behaviors. These data are useful for understanding of intracellular signaling of cell growth inhibition induced by LAT1 inhibitors as candidate for anticancer drug therapy.
Chaisiri Wongkham,Arthit Tolek,Nittaya Chamadol,Puangrat Yongvanit,Sopit Wongkham 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
The incidence of cholangiocarcinoma (CCA), a bile duct cancer, is high in the northeastern part of Thailand. At present, there is no known marker that can be used as an early marker for CCA. The surveillance of people at risk of CCA is the effective strategy to detect patients with early CCA, the stage at which surgery for completely cure can be offered. There is accumulated evidence indicated that people with chronic inflammation of bile duct epithelia and peribiliary fibrosis have high risk of CCA. Recently, a high resolution ultrasonography of peri-portal fibrosis was shown to be the acceptable approach to identify people at high risk or early CCA. However, the ultrasonography has to be conducted and determined by an experience radiologist and the operation cannot be offered for people in rural area. In this study, we aimed to find a suitable serum marker that can distinguish people who has benign bilirary diseases (BBD) or CCA from healthy subjects, liver fluke infected persons and patients with other gastro-intestinal cancers. Serum was electrophoresesed in a 12% SDS-polyacrylamide gel electrophoresis and ConA-binding glycoproteins were determined using lectin-biotin/avidin-peroxidase system. ConA blotting of serum from 29 CCA and 23 benign biliary diseases were compared with those from healthy persons (n = 20), active liver fluke infected people (n =10), patients with hepatoma (n =15) and other gastro-intestinal cancers (n =20). A high molecular weight of ConA binding glycoprotein was frequently detected in 85% of serum from CCA and BBD comparing to 24.6% of all serum from the control group. This marker can identify person who had CCA or BBD with a 81.6% sensitivity, 75.4% specificity, 73.3% and 85.9% positive and negative predictive values, respectively. The value of this ConA-specific marker in differentiating people who are at risk of CCA should be re-investigated in a larger cohort including people from the villages that are in the endemic area of liver fluke infection and patients with various pathological conditions.