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Export Processing Zones, Backward Linkages and Unemployment
Yabuuchi, Shigemi 세종대학교 국제경제연구소 2003 Journal of Economic Integration Vol.18 No.2
This paper investigates the effects of export processing zones (EPZs) on factor rewards, national income and the output of the domestic intermediate good producing sector (backward likage effect)in surplus0labor developing countries. It is shown that if the intermediate good is internationally traded, an inctease in foreign capital investment in the EPZs will not change factor rewards and then national income irrespective of the existence of unemployment. It is also shown that, contraty to the conventional wisdom, an increase in foreign capital investment decreases production of the intermediate good and increases unemployment. The effects of factor accumulation on outputs and unemployment are also examined.
Outsourcing, Income Distribution, and Unemployment
( Shigemi Yabuuchi ) 세종대학교 경제통합연구소(구 세종대학교 국제경제연구소) 2011 Journal of Economic Integration Vol.26 No.4
This paper examines the effects of outsourcing on employment and unemployment and income distribution in an economy with Harris-Todaro type unemployment. This is because both wages and jobs are important concerns for an economy that engages in outsourcing and consequently experiences widespread unemployment. The main findings of this paper are as follows: (i) If the outsourced factor is not produced domestically, outsourcing increases the rural wage rate (and the expected urban wage rate) and decreases the unemployed-to-employed ratio in the urban area, and it may increase unemployment in the home country. (ii) If the outsourced factor is produced domestically, outsourcing may decrease the rural wage rate (and the expected urban wage rate), and may increase the unemployedto- employed ratio in the urban area if the rural wage rate is not sensitive to the employment in the rural sectors.
Immigration and Unemployment of Skilled and Unskilled Labor
( Shigemi Yabuuchi ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2008 Journal of Economic Integration Vol.23 No.2
This paper discusses the problem of unemployment in developed countries that faces international labor movement. There are two types of unemployment. The first traditional type of unemployment exists simply because the common wage rate is fixed and higher than the equilibrium level. The second one may exist when the wage rate in one sector is high and fixed, while that in the other is flexible. On the other hand, an extensive movement of labor among countries has been observed. Thus, this paper investigates the effects of immigration and other policies on the two types of unemployment.
Globalization, International Factor Mobility, and Wage Inequality
( Shigemi Yabuuchi ) 세종대학교 경제통합연구소 2015 Journal of Economic Integration Vol.30 No.3
The international movement of economic factors such as capital and skilled labor has complex effects on the economies involved, especially when multiple factors move at the same time. One important effect is the potential change in wage inequality between skilled and unskilled labor-particularly, in developing countries that have agreed to trade with developed countries. This study considers a small open economy with two goods and three factors to determine whether wage inequality increases or decreases due to increased movement of these factors. The key findings are that wage inequality can unambiguously increase and decrease, under certain circumstances regarding the capital intensity of the sector(s), the initial amount of foreign factors, and the shares of factors in national income.
Export Processing Zones, Backward Linkages and Unemployment
( Shigemi Yabuuchi ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2003 Journal of Economic Integration Vol.18 No.2
This paper investigates the effects of export processing zones (EPZs) on factor rewards, national income and the output of the domestic intermediate good producing sector (backward linkage effect) in surpluslabor developing countries. It is shown that if the intermediate good is internationally traded, an increase in foreign capital investment in the EPZs will not change factor rewards and then national income irrespective of the existence of unemployment. It is also shown that, contrary to the conventional wisdom, an increase in foreign capital investment decreases production of the intermediate good and increases unemployment. The effects of factor accumulation on outputs and unemployment are also examined.
Colored Batch Petri Net and its Application to Emergency Evacuation System
Maki Yabuuchi,Atsushi Ohta,Kohkichi Tsuji 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Petri net is a powerful modeling tool for concurrent systems. This paper gives the definition of batch colored Petri net, an extended class of Petri net. Some analysis methods are studied. These results are applied to verification of an emergency evacuation system.
Foreign Investment, Urban Unemployment, and Informal Sector
( Hamid Beladi ),( Shigemi Yabuuchi ),( Gu Wei ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2005 Journal of Economic Integration Vol.20 No.1
In this paper we extend the Harris-Todaro model to include an urban informal sector. The effects of exogenous inflow of foreign capital on outputs, unemployment and welfare are examined in the model where the product of the informal sector is used as an industrial input in the urban formal sector. We also analyze the implications of the capital inflow for income distribution.
Oda, Akira,Katayose, Yu,Yabuuchi, Shinichi,Yamamoto, Kuniharu,Mizuma, Masamichi,Shirasou, Satoru,Onogawa, Toru,Ohtsuka, Hideo,Yoshida, Hiroshi,Hayashi, Hiroki,Rikiyama, Toshiki,Kim, Hyunjung,Choe, You Potamitis Press 2009 Anticancer research Vol.29 No.4
<P>Circadian rhythms are the daily oscillations of multiple biological processes regulated by an endogenous clock. The Period2 gene is essential in controlling the circadian rhythm and plays an important role in tumor suppression. We examined whether the overexpression of the mouse Period2 gene (mPer2) in cultured tumor cells from human tissues inhibits cell growth, using the recombinant adenovirus vector AdmPer2. The overexpression of mPer2 in human pancreatic cancer cells (Panc1, Aspc1) reduced cellular proliferation and induced apoptotic cell death. Infection with AdmPer2 also inhibited cell-cycle progression, inducing arrest at the G(2)-M phase. Western blotting analyses confirmed that infection with AdmPer2 reduced Bcl-X(L), Cdc2 and cyclin B1 protein, whereas it increased Bax protein in Aspc1 cells. The overexpression of mPer2 suppressed Cdc2 kinase activity. Moreover, infection with AdmPer2 resulted in dose-dependent synergic cell killing effects with the anticancer agent cisplatin (CDDP) in human pancreatic cancer cells. This synergic effect might be related to the reduction of Bcl-X(L) induced by infection with AdmPer2. Our results suggest that the circadian gene Period2 may play an important role in suppression of cell proliferation in human cancer, and additionally Period2 gene expression level may influence the sensitivity to cisplatin depending on Bcl-X(L) expression level.</P>
Present Status of Endoscopic Submucosal Dissection for Non-Ampullary Duodenal Epithelial Tumors
Naomi Kakushima,Masao Yoshida,Yohei Yabuuchi,Noboru Kawata,Kohei Takizawa,Yoshihiro Kishida,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi,Hiroyuki Ono 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Prediction of histology by endoscopic examination is important in the clinical management of non-ampullary duodenal epithelial tumors (NADETs), including adenoma and adenocarcinoma. The use of a simple scoring system based on the findings of white-light endoscopy or magnified endoscopy with narrow-band imaging is useful to differentiate between Vienna category 3 (C3) and C4/5 lesions. Less invasive endoscopic resection procedures, such as cold snare polypectomy, are quick to perform and convenient for small (<10 mm) C3 lesions. Neoplasms with higher grade histology, such as C4/5 lesions, should be treated by endoscopic mucosal resection (EMR), endoscopic submucosal dissection (ESD), or surgery. Although EMR often requires piecemeal resection, the complication rate is acceptable. Excellent complete resection rates could be achieved by ESD; however, it remains a challenging method considering the high risk of complications. Shielding or closure of the ulcer after ESD is effective at decreasing the risk of delayed bleeding and perforation. Laparoscopic endoscopic cooperative surgery is an ideal treatment with a high rate of en bloc resection and a low rate of complications, although it is limited to high-volume centers. Patients with NADETs could benefit from a multidisciplinary approach to stratify the optimal treatment based on endoscopic diagnoses.
Kojima Tsukasa,Yamasaki Yuzo,Kamitani Takeshi,Yabuuchi Hidetake,Shirasaka Takashi,Shimomiya Yamato,Kondo Masatoshi,Hamasaki Hiroshi,Kato Toyoyuki,Nagao Michinobu,Honda Hiroshi 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.1
Objective: The smallest diagnostically sufficient amount of contrast media (CM) should be used for coronary computed tomography angiography (CCTA) to minimize the risk of contrast- induced nephrotoxicity in elderly patients with coronary artery disease. The purpose of this study was to propose dynamic-CCTA using a low dose of CM and temporal maximum intensity projection (TMIP) and to investigate its image quality compared to standard-CCTA. Materials and Methods: Participants comprised 30 patients with coronary artery disease who underwent dynamic-CCTA and standard-CCTA using 320-row CT. Dynamic-CCTA was continuously performed at mid-diastole throughout 15–25 cardiac cycles after bolus injection of CM [103 mg iodine/kg body weight (mgI/kg)]. TMIP-CCTA was reconstructed from three-phase dynamic-CCTA data, including a phase with peak enhancement of the ascending aorta. Standard-CCTA was performed using a standard CM dose (259 mgI/kg). Image quality of both TMIP-CCTA and standard-CCTA was analyzed. Results: The amount of CM used in TMIP-CCTA and standard-CCTA was 16.2±2.6 mL and 40.1±7.3 mL, respectively. The mean effective radiation dose was not significantly different between the two methods. Mean coronary attenuation was significantly lower for TMIP-CCTA than standard-CCTA [346.9±82.8 Hounsfield units (HU) vs. 455.4±75.3 HU, p<0.05]. Image noise was significantly lower for TMIP-CCTA than standard-CCTA (20.0±3.2 HU vs. 28.1± 3.6 HU, p<0.05). There were no differences in signal-to-noise ratio and visual assessment scores between the two methods. Conclusion: TMIP-CCTA can be performed using more than 50% less CM with the same image quality as standard-CCTA.