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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.
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.
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 ),( Gyu Seong Choi ),( Jong Man Kim ),( Jae-won Joh ),( Choon Hyuck David Kwon ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: We designed this study to analyze the feasibility of laparoscopic living donor hepatectomy compared to open living donor hepatectomy. Methods: Donors who underwent living donor right hemihepatectomy or extended right hemihepatectomy by laparoscopy or open surgery from May 2013 to October 2017 were included in the study. Comparisons between laparoscopic surgery and open surgery were performed using Student’s t-test, Mann-Whitney test, chi-square test, Fisher’s exact test, and linear-by-linear association. Results: During the study period 305 patients underwent living donor right hemihepatectomy or extended right hemihepatectomy. Of these, 100 underwent laparoscopic surgery and 205 underwent open surgery. The laparoscopy group (30.9±11.2 years) had significantly younger age than the open group (34.5±12.3 years, P=0.014). The laparoscopy group mostly had type 1 (95.0%) bile duct and 81% had single bile duct in liver grafts, compared with 59.5% type 1 bile duct and 59.5% with single bile duct in the open group. The laparoscopy group had significantly longer operation time (378.2 ± 93.5 minutes vs. 329.1 ± 68.0 minutes, P<0.001) and warm ischemic time (median 271 minutes vs. 151 minutes, P<0.001) compared to the open group. However, estimated blood loss was smaller in the laparoscopy group (298.3 ± 162.9 mL vs. 344.3 ± 149.9 mL, P=0.015). There was no difference in complication rate (lap-aroscopy group 22.0% vs. open group 15.6%, P=0.170) and the severity of complications classified by Clavien-Dindo system did not differ significantly between the groups (P=0.094). Conclusions: When living donors are selected cautiously, lap-aroscopic living donor hepatectomy can be performed safely with similar outcome to open surgery. However, the procedure should be performed by a surgeon experienced in both liver transplantation and minimally invasive surgery.