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A Comparative Study on Political Trust in Transition Countries
최창용,우혜영 서울대학교행정대학원 2023 Journal of Policy Studies Vol.38 No.4
This paper investigates the origin of political trust in post-communist Central European and Soviet Union countries. By comparing two competing theories that explain political trust, institutionalism, and socialization theory, the paper tried to explore which theory shows a higher explanatory power in the transitional context. The research employs ordinary least squares (OLS) methodology, using country and time as dummies to control for unobserved heterogeneity. The main independent variable is constructed based on the ‘cohort effect,’ representing years of experience of communist rule. The study explores the role of socialization, institutionalism, and labor market experiences as determinants of political trust. Findings indicate that socialization under communism resisted democracy and market economy adoption, but economic and political situations played a more significant role in shaping political trust. Additionally, being employed in the state sector or self-employed during the transition period positively influenced political trust levels. This research sheds light on the intricate factors influencing political trust in the aftermath of significant institutional transformations in post-communist countries.
Polygoum Tinctoria의 색소 성분의 물리화학적 특성
최창용,장미경,공병기,임동한,최혜영,나재운,이동병,나상권 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
Indigo, as a blue pigment, has been known as one of the oldest natural dyes. Generally, natural dyes have moderate colors and are enviromentally friendly, but harmful mordants must be used for fixing them and obtaining a full color range no fabric and it is very hard to improve K/S values of the dyeings and mordanting. In this study was investigated physicochemical characterization of polygoum tinctoria dye substance to solve these problem. Calcium hydroxide was added into polygoum tinctoria leaves to precipitate dye substance and it was freezing dried into powder form. It's characterization was investigated to UV/VIS spectrophotometer, TLC and DSC. Indigo and Indirubin was separated from polygoum tinctoria powder for soxhlet extraction, and these structure and characterization were investigated to FT-IR spectrum.
최창용,조숙현,한만희,권응기,최성복,최연호,최순호,손동수,최상용 한국수정란이식학회 2002 한국수정란이식학회 학술대회 Vol.2002 No.1
면양과 염소가 최근 수십년동안 세계여러 나라에서 번식생리의 연구를 위한 모델로 사용되어 왔는데, 체내수정란의 생산에 관한 영역도 유럽을 중심으로 활발하게 연구되어왔다. 수정란생산을 위한 발정동기화방법, 과배란처리 및 수정란회수방법 기술은 현재 상당히 많은 기술진척이 이루어진 상태이나, 우리나라 고유의 재래유전자원인 흑염소에는 이를 위한 기술이 미진한 실정이므로 본 실험에서는 흑염소의 체내수정란생산기술을 확립하여 재래가축 유전자원보존을 위한 기초기술을 마련하고자 한다. 축산기술연구소 남원지소에서 사육하고 있는 체중 20kg 이상의 건강한 흑염소를 이용하여 발정동기화를 위해 controlled intravaginal drug release(CIDR)를 질내에 14일 동안 삽입하고, 과배란처리는 FSH를 CIDR 삽입 12, 13, 14일째에 12시간 간격으로 점감법으로 총20mg을 투여하였으며, PGFa를 13일째 FSH와 함께 투여하였다. CIDR는 14일째의 아침에 제거하였다. 수컷과의 교미는 CIDR제거 24시간후에 GnRH를 투여와 동시에 실시하였으며, 채란은 교미후 3일째에 외과적인 방법으로 실시하였다. CIDR처리경과에 따른 progesterone농도는 CIDR 주입시 바로 수치가 상승하여 제거전까지 6~12ng/m1의 농도를 유지하였으며, 제거즉시 2ng/ml 이하로 떨어졌다. 채란시 평균 배란점은 16.5개, 미배란난포 9.8개였으며, 회수수정란은 6.0개를 나타내어 채란율은 36.4%를 나타내었다. 회수된 수정란의 발달단계는 4-cell 78.9%, 2-cell 5.3%, fragmentation 15.8%를 나타내었다. 이와 같은 체내수정란생산방법을 기반으로 하여 이후 수정란의 동결 및 수정란이식기법에 관한 연구를 수행한다면 우리나라의 재래가축인 흑염소의 유전자원 장기보존과 생산성향상에 기여할 것으로 사료된다.배양액에 30 embryos/50ul 소적으로하여 38.8, 5% 의 탄산가스 배양기에서 각각 7일간 배양을 실시하였다. 조사된 결과는 SAS/STAT를 이용하여 통계분석을 실시하였다. 체외수정 12시간 후에 난자 급속 염색법으로 염색을 실시한 결과, 모든 처리구에서 핵성숙률(76.4~95.2%), 정자침투율(51.1~66.9%), 웅성전핵형성률(95.2~100%), 다정자침입률(18.2~25.6%) 및 평균침입정자수(1.2~l.4개)에서 유의적인 차이가 인정되지 않았다. 체외배양 48시간 난할률을 조사한 결과, 처리구별 차이(53.9~67.9%)는 인정되지 않았으나, 배양 7일째 배반포형성률은 각각 14.5, 25.4, 17.3 및 12.4%로서 25uM의 -ME처리구가 유의적(P<0.05)으로 높은 배발달률을 나타내었고, 총세포수에 있어서는 대조구와 처리구간 유의적인 차이가 인정되지 않았다. 따라서 돼지 난포란을 성숙배양할 때, 25uM -ME를 첨가배양하는 것이 양질의 돼지체외수정란을 생산하는 하나의 방법으로 조사되었다.다. natural objects and was popular at the time of Yukjo Dynasty, and there are some documents of that period left both in Japan and Korea. "Hyojedo" in Korea is supposed to have been influenced by the letter design. Asite- is also considered to have been "Japanese Letter Jobcheso." Therefore, the purpose of this study is to look into the origin
한우 수정란의 산소 소비량이 수청란이식 수태윷에 미치는 영향
최창용,손준규,조상래,강다원,연성흠,최선호,최수호,김남태,김재범,정연 韓國受精卵移植學會 2010 한국동물생명공학회지 Vol.25 No.3
Oxygen consumption has been regarded as a useful indicator for assessment of mammalian embryo quality. This study was performed to investigate whether oxygen consumption reflects morphological grade of in vivo derived bovine blastocyst-stage embryos (blastocyst). The oxygen consumption of in vitro produced blastocyst was compared to its total cell number. In addition, pregnant rate was measured after transplantation of in vivo blastocysts with different oxygen consumption. The quality of blastocyst collected on day 7 after artificial insemination was categorized as grade I and II (G I and G II) based on microscopic observation of the morphology. Oxygen consumption of blastocyst was measured using a scanning electrochemical microscopy (SECM) and total cell number of in vitro blastocyst was enumerated by counting cells stained by propidium iodide. Pregnancy of recipient cow was confirmed with rectal palpation after 60 days of embryo transfer. The oxygen consumptions of G I blastocysts were significantly higher than those of G II blastocysts ( versus , p<0.05). Total cell numbers of in vitro blastocysts were 74.8, 90.7, and 110.2 in the oxygen consumption of below 10.0, 10.0~12.0, and over respectively. Total cell number was significantly increased in embryos with high oxygen consumption (p<0.05). Pregnant rate in recipient cow was 0, 50, and 85.7% in the transplantation of embryo with the oxygen consumption of below 10.0, 10.0~12.0, and over , respectively. These results suggest that measurement of oxygen consumption may help increase the pregnant rate of bovine embryos.