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An Expand of Oligopoly Theory and Commercial Policy to International Trade
Rhu, Duk-Wi,Min, Kyung-Se 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.2
Recently, with growth of industrial organization theories, there seems to be necessary for an intergration of industrial organization theories and international trade theories. This paper applied Cournot and Bertrand's duopoly model to international trade theory and analyzed producer's revenue.
Utility accrual real-time scheduling for (m, k)-firm deadline-constrained streams on multiprocessors
Rhu, J.-H,Sun, J.-H,Kim, K,Cho, H,Park, J K IET 2011 Electronics letters Vol.47 No.5
<P>Considering video conferencing applications, presented is the first utility accrual (or UA) real-time scheduling algorithm for multiple (<I>m</I>, <I>k</I>)-firm deadline-constrained streams running on multiprocessors, called the global multiprocessor utility accrual scheduling algorithm for (<I>m</I>, <I>k</I>)-firm deadline-constraint multimedia streams (or gMUA-MK). Analytical and experimental studies show that gMUA-MK achieves timeliness performance and relatively high quality of multimedia services compared to existing schemes including gMUA.</P>
류지성,정규혁,최필선,이길철,최덕일,최성수,류홍일,박광식 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1
Cadmium, a major aquatic pollutant in many parts of the world, is toxic and readily accumulated in aquatic organisms. It mainly exists in water as complexes with organic ligands such as dissolved organic carbon and this complexation is known to have effects on the aquatic toxicities. In this study, acute toxicity, histology, and bioaccumulation were studied to evaluate effects of humic acid on cadmium toxicity and bioavailability to fish using Oryzias latipes and Cyprinus carpio. 96h-LC50 of cadmium was 6.38 ㎎/L using Oryzias latipes. However, the mortality showed the dose-dependent decrease when humic acid was added to the test solution. When fish were exposed to 5㎎/L of cadmium, histological changes in the exposed organs(caudal fins, gills, kidney, liver, and gut) of Cyprinus carpio were decreased by humic acid, especially in kidney and liver. Bioaccumulation of cadmium also decreased by treatment of humic acid. It seems that the formation of complexes between cadmium and humic acid may decrease bioavailability of cadmium to fish, and thus reduce the toxic effects of cadmium.
류지성,정규혁,최필선,이길철,최덕일,최성수,류홍일,박광식 한국환경독성학회 1998 환경독성보건학회지 Vol.13 No.1
Cadmium, a major aquatic pollutant in many parts of the world, is toxic and readily accumulated in aquatic organisms. It mainly exists in water as complexes with organic ligands such as dissolved organic carbon and this complexation is known to have effects on the aquatic toxicities. In this study, acute toxicity, histology, and bioaccumulation were studied to evaluate effects of humic acid on cadmium toxicity and bioavailability to fish using Oryzias latipcs and Cypriruts carpio. 96h~LC50 of cadmium was 6.38 mg/L using Oryzias latipes. However, the mortality showed the dose-dependent decrease when humic acid was added to the test solution. When fish were exposed to 5 mg/L of cadmium, histological changes in the exposed organs (caudal fins, gills, kidney, liver, and gut) of Cyprinifs carpio were decreased by humic acid, especially in kidney and liver. Bioaccumulation of cadmium also decreased by treatment of humic acid. It seems that the formation of complexes between cadmium and humic acid may decrease bioavailability of cadmium to fish, and thus reduce the toxic effects of cadmium.
( Jinsoo Rhu ),( Jong Man Kim ),( Gyu Seong Choi ),( Choon Hyuck David Kwon ),( Jae-won Joh ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: This study was designed to validate the alpha-fetoprotein model for predicting recurrence after liver transplantation in Korean hepatocellular carcinoma patients. Methods: Patients who underwent liver transplantation for hepatocellular carcinoma at Samsung Medical Center between 2007 and 2015 were included. Recurrence, overall survival, and disease-specific survival of patients divided by both the Milan criteria and the alpha-fetoprotein model were compared using Kaplan-Meier log-rank test. The predictability of the alpha-fetoprotein model compared to the Milan criteria was tested by means of net reclassification improvement analysis applied to patients with a follow-up of at least 2 years. Results: A total of 400 patients were included in the study. Patients within Milan criteria had 5-year recurrence, and overall survival rates of 20.9% and 76.3% respectively, compared to corresponding rates of 50.3% and 55.7%, respectively, for patients who were beyond Milan criteria. Alpha-fetoprotein model low risk patients had 5-year recurrence and overall survival rates of 21.1% and 76.2%, respectively, compared to corresponding rates of 57.7% and 52.2%, respectively, in high risk patients (P<0.001, all). Although overall net reclassification improvements were statistically nonsignificant for recurrence (NRI=1.7%, Z=0.30, P=0.7624), and overall survival (NRI=9.0%, Z=1.60, P=0.1098), they were significantly better for predicting no recurrence (NRI=6.6%, Z=3.16, P=0.0016) and no death. (NRI=7.7%, Z=3.65, P=0.0003) Conclusions: The alpha-fetoprotein model seems to be a promising tool for liver transplantation candidacy, but further investigation is needed.