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김상하,Kim, Sang-Ha 한국데이터베이스진흥원 2004 디지털콘텐츠 Vol.8 No.-
MMDBMS(Main Memory DataBase Management System)는 통신업종을 주력으로 해 금융업종으로 빠르게 성장세를 이어가며 데이터베이스 관리시스템 시장에서 3% 이상의 높은 시장점유율을 차지하고 있다. DDBMS(Disk-based Database Management Sysrem 디스크 기반 데이터베이스 관리시스템)의 부족한 기능을 보완 또는 부분적으로 대체하고있는 것이다. 하지만 정작 사용자들은 MMDBMS에 대해 잘 모르는 경우가 많고, 또 정확한 이해를 하지 못하고 있는 경우가 대부분이다. 이 글에서는 MMDBMS에 대한 정확한 이해를 통해 정보시스템을 구축하는데 있어서 DDBMS의 기능을 보완하는김상하MMDBMS의 활용을 돕고자 한다.
Epidemiological Characterization of Skin Fungal Infections Between the Years 2006 and 2010 in Korea
김상하,조성학,윤승기,박제섭,최종태,백영석,유영빈,김영권 질병관리본부 2015 Osong Public Health and Research Persptectives Vol.6 No.6
Objectives: The purpose of this study was to build and provide a basic database of skin fungal infections for the effective management of skin fungal infections in the future. Methods: We collected health insurance data between the years 2006 and 2010 from the Health Insurance Corporation (Seoul, Korea) and analyzed the data to determine the prevalence and treatment management of skin fungal infections. Results: Skin fungal infections were divided into two groups: namely dermatophytosis and other superficial mycoses. Dermatophytosis showed a higher prevalence (16,035,399 cases) than the other superficial mycoses (794,847 cases) within the study period. The prevalence rate decreased consecutively by 0.01% to 0.19% every year. The prevalence according to region showed that Jeolla-do had a high prevalence distribution. The prevalences in men and women were similar (7.01% vs. 6.26%). It is interesting to note that adults from the 50-79-year age group showed a higher prevalence than children and young adults. The average convalescence time (days) of dermatophytosis was longer than that of other superficial mycoses. The total medical expenses were also much higher in dermatophytosis than in the other superficial mycoses. Conclusion: This study provides useful data for study trends of skin fungal infections.
김상하,우종석,박수영 한국고분자학회 2020 Macromolecular Research Vol.28 No.11
Graphite nanoplatelets (GNPs) have been used as a secondary filler to improve the electrical conductivity of poly(phenylene sulfide) (PPS)/graphite composites for use as bipolar plates in fuel cells, and the effects of adding small quantities of GNPs on the electrical, thermal, and mechanical properties of PPS/GNP/graphite composites have been extensively studied. The GNPs were compounded with PPS to produce master batch (MB) chips that were further ground to fine MB powder (MBg). PPS/MBg/graphite powders were compressed to fabricate 10-mm thick square samples. Composites containing a large quantity of graphite (~80 wt%) were then tested for use as a bipolar plate in phosphoric acid fuel cells. When 5 wt% GNP was added to the PPS/graphite composite, the in-plane electrical conductivity increased almost twofold from 643 to 1340 S·cm-1, the through-plane electrical conductivity increased from 19 to 54 S·cm-1, the through-plane thermal conductivity increased approximately two-fold from 60 to 129 W·(mK)-1, and the flexural strength decreased slightly from 32 to 26 MPa. The fractured surface of the compressed MBg sample revealed well-dispersed GNPs in the PPS matrix, which created electrical pathways and improved the electrical conductivity of the non-conducting PPS matrix material. Thus, the PPS/GNP/graphite composite is a promising system for bipolar plate applications because a higher amount of graphite (~93 wt%) is needed in PPS/graphite composites to reach the same level of electrical conductivity as the PPS/MBg (5 wt%)/graphite (75 wt%) composite, and such a large quantity of graphite is difficult to process and leads to weaker mechanical properties.