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플래시 메모리 GC (가비지 콜렉션) 오버헤드를 줄이기 위한 블록 링크드 리스트 기법
구소현 ( Ohyun Koo ),김성수 ( Sungsoo Kim ),정태선 ( Tae-sun Chung ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
플래시 메모리는 소형 저장 장치뿐만 아니라 대용량 저장장치까지 응용되고 있다. 하지만 기존의 하드디스크 (HDD)와 다르게 플래시 메모리는 읽기, 쓰기, 소거 연산의 속도가 다르고 쓰기 전 지우기(erase before write)라는 특성 때문에 FTL의 한 메커니즘인 GC (Garbage Collection)를 수행할 때 많은 오버헤드가 발생한다. 이에 이 논문은 DRAM의 공간을 효율적으로 활용하고 유효한 페이지 복사 와 소거 연산의 횟수를 줄여 전체적인 플래시 메모리 GC 오버헤드를 줄이기 위한 블록 링크드 리스트 기법을 제안한다. 블록 링크드 리스트 기법은 같은 LBN에 해당하는 데이터를 로그 블록에 적고 해당 로그 블록들을 링크드 리스트로 관리해 소거 연산을 미룰 수 있다. 링크드 리스트들에 관한 정보는 DRAM에 테이블 형태로 적는다. 이때 테이블에는 블록 주소들이 적히므로 페이지 단위로 링크드 리스트를 관리하는 다른 기법에 비해 DRAM의 공간을 효율적으로 활용하게 된다.
한정훈,구소현,이한주 한국사회체육학회 2019 한국사회체육학회지 Vol.0 No.78
Purpose: Previous studies showed that women’s sport is greatly underreported and trivialized in newspapers. Thus, the purpose of this study was to examine the portrayals of Korean male and female athletes in media coverage. Research questions were (1) how media describe female athletes in comparison to male athletes and (2) how conservative news media describe female athletes comparing to progressive media. Methods: Using Python’s text mining, the raw data were extracted from the news articles relating to big-name Korean sports figures (two male and female each) including Yu-na Kim (Olympic medalist in figure skating), Tae-hwan Park (Olympic medalist in swimming), Yeon-jae Sohn (rhythmic gymnastics), and Heung-min Son (Soccer player in the premier league). A number of news articles from 2000 to 2017 were used as data (e.g., N=59606 for Y Kim, N=27165 for T Park, N=20262 for Y Sohn, and N=43350 for H Son). Data were analyzed using social network analysis tools such as UCINET. The semantic network analysis was conducted and visualized using the Pajek program. Results: Analysis of network centrality (e.g. degree, betweenness, and closeness), density, and strong components showed that regardless of gender, performance-related words such as performance, Olympic, or winning showed high in centrality index. In addition, conservative media focused on the soft news in which words like boyfriend and dating were ranked high (e.g., fourth and sixth) in indegree centrality while progressive media focused on the hard news (e.g, winning, champion, performance). Semantic network analysis was discussed to improve content analysis used in previous research. Conclusions: The results of this study showed that both male and female athlete were revered and praised for their athletic achievements. This study concluded that media coverages in Korean new papers did not portray male and female athletes differently in terms of masculinity or femininity using sexist framing. This study identifies a far greater diversity of media representations of female athletes that have been claimed in previous studies and thus future research needs to focus more on the exploration of different cultural contexts.
Capillary Electrophoresis에 의한 Carvedilol 및 그 대사체의 거울상이성질체 분리
명승운,조천호,구소현 한국분석과학회 2006 분석과학 Vol.19 No.4
A capillary electrophoresis method for the separation of carvedilol and its metabolites enantiomersconcentration and capillary temperature for enantiomer resolution were investigated. Best results were obtainedby 15 mM carboxymethyl-β-cyclodextrin in the run bufer. Also the effect of capillary temperature on efficiencywas assessed. The optimized method was applied for separation of chiral carvedilol and its three metabolites.