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Chao Wang,Yul-Seong Kim,Chong Wang,Chi Yeol Kim 한국무역학회 2021 Journal of Korea trade Vol.25 No.1
Purpose – This paper investigates the causal relationship between logistics infrastructure development and the economic growth of Korea. Considering the industrial and economic structure of Korea, it is likely that logistics infrastructure is positively associated with the economic growth of the country. Design/methodology – The causal relationship between logistics infrastructure and economic development is estimated using Vector Autoregressive (VAR) and Vector Error Correction Model (VECM) considering long-run equilibrium between the two factors. To this end, a dataset consisting of 7 logistics infrastructure proxies and 5 economic growth indicators covering the period of 1990-2017 is used. Findings – It was found that causality, in general, runs from logistics infrastructure development to economic growth. Specifically, the results indicate that maritime transport is positively associated with the economic growth of Korea in terms of GDP and international trade. In addition, other modes of transport also have a positive impact on either the GDP or international trade of Korea. Originality/value – While existing studies in this area are based on either regional observations or a specific mode of transport, this study presents empirical evidence on causality between logistics infrastructure and the economic growth of Korea using a more comprehensive dataset. In addition, the findings in this paper can provide valuable implications for transport infrastructure development policies.
왕차오(Chao Wang),추웨이롱(Weilong Chu),김치열(Chi Yeol Kim) 한국무역학회 2020 Journal of Korea trade Vol.24 No.2
Purpose - This study investigates the impact of inland port development in China on the promotion of bilateral trade flows between China and South Korea. Design/methodology - The probable association between the establishment of inland ports and SinoKorea trade was estimated using gravity models. In this regards, two sets of data were collected. The first dataset consists of the baseline variables of a gravity model, while the second one includes variables of logistics infrastructure development. The indicators of logistics infrastructure development include inland ports, the amount of government expenditure on transport infrastructure, the lengths of roads and railways, the number of trucks and the number of logistics industry workforce. Findings - The results show that inland port development has a positive impact on facilitating bilateral trade between China and South Korea. However, the positive association holds only for Chinese regions with a large trade volume and a proximity to seaports. In other regions, the impact of inland ports is not statistically significant. Originality/value - To the best knowledge of the authors, this study is the first attempt to explore the economic impact of inland ports in China. In addition, the findings in this paper provide both policy and managerial implications for the future development of inland ports, such as the strategic location of inland ports and integrated intermodal operations.
Nonlinear dynamic analysis of a relatively short spherical gas journal bearing system
Cheng-Chi Wang,Chao-Lin Kuo 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.8
This paper studies the nonlinear dynamic behavior and bifurcation of a rigid rotor supported by two relatively short spherical gas journal bearings. The modified Reynolds equation is solved by a hybrid numerical method combining the differential transformation method (DTM) and the finite difference method (FDM). The analytical results reveal a complex dynamic behavior comprising periodic, subharmonic and quasi-periodic responses as the rotor mass and bearing number are increased. The results obtained using the hybrid DTM&FDM scheme are found to be in good agreement with those of a hybrid scheme comprising the successive over relaxation (SOR)method and the FDM scheme. Therefore, the DTM&FDM method provides an effective means of gaining insights into the nonlinear dynamics of relatively short spherical gas rotor-bearing systems.
Liang-Kun Chen,Ching-Chi Hsieh,Yi-Chao Huang,Yuan-Jung Huang,Chun-Fan Lung,Wei-En Hsu,Chao-Ling Yao,Tsung-Yu Tseng,Chi-Chung Wang,Yi-Chiung Hsu 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.3
Most of the gas exchange in the human body is carried out by the lungs, and the physiological activities of the lungs are uninterrupted. Due to the deterioration of the external environment, pulmonary cell lesions are common clinical lung diseases. Mechanical cyclic stretching is one kind of bionic technology to observe lung cancer cells. The A549 cell line is the human lung adenocarcinoma cell line derived from a primary lung tumor. This study investigated the effects of mechanical cyclic stretching on A549 cell activity and gene expression profile. Whereas mechanical cyclic stretching had no significant difference in colony formation and cell migration of A549 cells, the cell invasion increased significantly in A549 cells after stretching. In addition, the microarray data showed that mechanical cyclic stretching altered gene expression, induced inflammation of cells, and activation of Wnt/β- catenin and tumor necrosis factor pathways. More importantly, mechanical cyclic stretching activated the expression of tumor necrosis factor-alpha (TNF-α) protein. Therefore, the increase of cell invasion induced by mechanical cyclic stretching might be associated with the activation of TNF-α in human lung adenocarcinoma cells.
( Jeffrey Samuel Co ),( Chih-chi ),( Wang ),( Chih-che Lin ),( Chee-chien Yong ),( Chao Long Chen ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Alcoholic liver disease (ALD) has been a growing indication for living donor liver transplantation (LDLT) in Asia but certain medical, ethical and psycho-social issues question its appropriateness. Reports on long-term outcomes of LDLT for ALD are also scarce and so our aim was to report our center’s experience for the past 15 years and how LDLT has evolved to be the treatment of choice for end-stage liver disease secondary to ALD in a high volume center. Methods: A total of 1,384 consecutive LDLT was performed from January 2003 to August 2016 at Kaohsiung Chang Gung Memorial Hospital, and 87 patients had a pre-operative diagnosis of alcoholic liver disease (ALD) with or without hepatocellular carcinoma (HCC). This group was systematically matched with non-ALD (NALD) patients in a ratio of 1:2 using equiprobability method. Overall patient survival was compared using Kaplan-Meier analysis, and incidences of post-transplant De novo malignancy and alcohol relapse were described. Results: Patient demographics were comparable, as well as preoperative and intra-operative data. Of the 87 patients in the ALD group, 26 (30%) had concomitant HCC. Median follow- up for this study was 50 months. Overall patient survival at 1, 3 and 5 years for ALD were 98%, 97% and 92% respectively, while the NALD group had similar survival rates (P =0.282). The rate for De novo malignancy was 6% while that for recidivism was 7% despite only 76% of the patients meeting the 6 months abstinence rule. Conclusions: Results from our center show that LDLT for ALD has comparable short and longterm outcomes when compared to NALD, and the close relationship between donor and recipient seems to positively affect alcohol relapse rate and patient compliance to medication.
Shiuan-Pey Lin,Pei-Dawn Lee Chao,Shang-Yuan Tsai,Meng-Ju Wang,Yu-Chi Hou 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.11
Citrus grandis peel (CGP) is a beverage ingredient and a medicinal herb in Oriental countries. Cyclosporine and tacrolimus, important immunosuppressants with narrow therapeutic windows, are widely used in transplant patients. This study investigated the effects of co-administering CGP on the bioavailability of cyclosporine and tacrolimus. Male Sprague–Dawley rats were orally administered tacrolimus or cyclosporine with and without CGP. The concentrations of cyclosporine and tacrolimus in blood were assayed by monoclonal fluorescence polarization immunoassay and microparticle enzyme immunoassay, respectively. P-glycoprotein- and cytochrome P 450 3A4 (CYP3A4)-associated mechanisms were investigated by using everted rat intestinal sac and recombinant CYP3A4 isozyme. The results showed that CGP significantly increased the bioavailability of cyclosporine and tacrolimus by 100.0% and 234.7%, respectively. Ex vivo studies indicated that the interaction was mediated by the inhibition of CYP3A4. We suggest that CGP is contraindicated for transplant patients treated with cyclosporine or tacrolimus to minimize the risk of intoxication.
The simple and easy way to manufacture counter electrode for dye-sensitized solar cells
Jo-Lin Lan,Yung-Yun Wang,Chi-Chao Wan,Tzu-Chien Wei,Hsien-Ping Feng,Chao Peng,Hai-Peng Cheng,Ya-Huei Chang,Wen-Chi Hsu 한국물리학회 2010 Current Applied Physics Vol.10 No.2
We previously developed poly-N-vinyl-2-pyrrolidone (PVP)-capped Pt nanoclusters on ITO glass via a simple ‘‘2-step dip coating process” as counter electrode for DSSC. This new counter electrode was examined by transmission electron microscopy (TEM), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and current–voltage curve (I–V curve). The TEM results revealed that PVP-capped Pt nanoclusters’ size is about 3 nm, and the amount of Pt deposited on ITO glass is about 5 ㎍/㎠. Comparing with sputtered Pt and Solaronix thermal cluster Pt-catalyst T/SP, the PVP-capped Pt counter electrode has lower amount of Pt deposited on TCO glass,more positive potential of tri-iodide reduction, and better performance for the charge-transfer resistance (RCT) and the cell efficiency (g).