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RISS 인기검색어
- 검색키워드
- 저자 : Seong Hee Kil (검색결과 275 건)
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재삽입을 수행하는 고차원 색인 구조를 위한 효율적인 동시성 제어 알고리즘
최길성,이석희,송석일,유재수,조기형 충북대학교 컴퓨터 정보통신 연구소 1999 컴퓨터정보통신연구 Vol.7 No.1
본 논문에서는 기존의 동시성 제어 기법들을 분석하고 CIR-트리를 위한 효율적인 동시성 제어 알고리즘을 제안한다. 기존에 다차원 색인구조에 대한 동시성 제어 기법으로 제시된 ??-트리는 다른 기법들에 비해 동시성 효율이 우수한 것으로 알려져 있다. 하지만 ??-트리를 CIR-트리에 그대로 적용할 경우 두 가지 문제점이 발생된다. 첫째는, CIR-트리의 성능 향상에 중요한 요소가 되는 재삽입에 대한 동시성 제어를 ??-트리에서 고려하지 않고 있다. 둘째는, ??-트리는 동시성 수준의 한계가 있는 잠금 결합 기법을 사용하고 있다. 본 논문은 두 가지 문제점을 해결할 수 있는 새로운 동시성 제어 알고리즘을 제안하며, 제안된 동시성 제어 알고리즘의 정확성을 증명한다. 또한, 제안한 알고리즘이 기존의 알고리즘에 비해 성능이 우수함을 실험을 통해서 보인다. In this paper we analyze existing concurrency control methods and propose an efficient concurrency control algorithm for CIR-tree. Among the existing concurrency control methods for multidimensional index structures, ??-Tree is one of the most efficient concurrency control algorithm. However, when we apply ??-Tree to the CIR-tree, there are two problems. First ??-Tree does not consider concurrency control for reinsertion operations that are main factor of performance improvement in the CIR-tree. Second since the ??-Tree uses lock-coupling strategy, it limits concurrency of the CIR-tree. The proposed concurrency control algorithm overcomes the two problems. We show the correctness of our proposed currency control algorithm. It is also shown through experiments that our algorithm outperforms the existing algorithms.
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소집단 책 만들기 활동이 유아의 창의성과 사회적 기술에 미치는 영향
조순자,심성경,변길희 이화여자대학교 교과교육연구소 2015 교과교육학연구 Vol.19 No.4
The purpose of this study is to examine the effect of book making activities in small groups devised and practiced by the researcher on young children’s creativity, and social skills. The study was conducted with a total of 43 five-year-old children in two classes of K Kindergarten in the city of J, Jeonbuk. The children were randomly divided into an experimental group(n=20) and a control group(n=23). Test tools for young children’s comprehensive creativity designed by Jeon Kyung Won(2010), rating scale tools for young children translated by Jeong Young Sun(2005) based on the social skills Rating Scales designed by Elliott and Gresham(1990) were used. Collected data were analyzed by using SPSS 20.0 program and a t-test was conducted to find out the difference between the experimental group and the control group. The results of the study are as follows. First, book making activities in small groups generally improved young children’s creativity such as originality, fluency, flexibility, and imagination. Second, book making activities in small groups generally improved young children’s Social Skills such as cooperation/ compliance, assertiveness, and self-control. 본 연구의 목적은 소집단 책 만들기 활동을 고안, 실시하여 유아의 창의성과 사회적 기술에 미치는 영향을 밝히는 것이다. 이를 위해 전라북도 J시에 소재한 K유치원의 만 5세 2개 학급의 유아 43명 중 1학급의 유아 20명을 실험집단, 다른 1학급의 유아 23명을 통제집단으로 임의 배정하였다. 또한, 유아의 창의성을 측정하기 위하여 Jeon(2010)이 만 4세에서 6세까지 유아를 대상으로 표준화한 ‘유아 종합 창의성 검사(K-CCTYC)와 유아의 사회적 기술을 측정하기 위하여 Eliott와 Gresham(1990)에 의해 고안된 사회적 기술 척도 중 유아용 척도를 Chung(2005)이 번역한 것을 사용하였다. 본 연구는 교사훈련, 검사자 및 평정자 훈련과 예비 검사, 사전검사, 실험처치, 사후검사 순으로 총 16주에 걸쳐 이루어지며 사전에 4주간의 예비연구를 진행하였다. 수집된 자료는 SPSS/PC 20.0 프로그램을 이용하여 실험집단과 통제집단의 사전-사후 점수 증가분에 대한 독립표본 t-검증을 실시하였다. 본 연구에서 얻어진 결과는 다음과 같다. 첫째, 소집단 책 만들기 활동은 유아의 창의성 발달을 전반적으로 증진시킨다. 즉, 유아의 독창성, 유창성, 융통성, 상상력의 4가지 하위영역 모두에서 긍정적인 효과가 있다. 둘째, 소집단 책 만들기 활동이 유아의 사회적 기술 행동을 전반적으로 증진시킨다. 즉, 협동/순응, 자기주장, 자아통제의 3가지 하위영역 모두에서 증진효과가 있다.
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Seong-Hee Kil(길성희),Byung-Duk Kim(김병덕),Jeong-Rock Kwon(권정락),Kee-Bong Yoon(윤기봉) 한국가스학회 2013 한국가스학회지 Vol.17 No.5
열가소성 플라스틱배관의 전기융착부에 대한 비파괴검사방법은 융착부의 안전성을 확보하고 장기적인 신뢰성을 확보하기 위한 방법이다. 정상적인 방법에 의하여 융착된 접합부에서도 배관의 진원도와 전기융착 소켓과의 진원도 차이 또는 기공 등에 의해 융착부에 결함이 발생할 수 있다. 본 연구에서는 위상배열초음파를 이용하여 손상된 폴리에틸렌 전기융착부의 검사를 수행하였다. 검사 대상인 250mm 직경의 폴리에틸렌 배관 전기융착부는 1994년 12월에 융착되었으며 실제 작동 압력은 2.45kPa이다. 2004년 2월 소켓 이음부 근처에서 가스가 누설되어 수거되었다. 손상된 전기융착부에 대하여 첫 번째로 육안검사를 실시하고 다음에 위상배열초음파를 이용한 비파괴검사를 실시하였다. 그리고 절단 검사를 실시하여 각각의 검사 결과와 비교하였으며 위상배열 초음파를 이용한 검사결과와 절단 검사 결과가 동일함을 확인하였다. Non destructive testing(NDT) methods of electrofusion(EF) joints of thermoplastics pipes are required for fusion joint safety and for the long term reliability of a pipe system. Electrofusion joints, which are joined at the proper fusion process and procedures, may encounter defects due to the difference of ovality between pipes and coupling, improper fusion process or porosity result from electrofusion joining. These defects can cause the failure of pipeline and by extension, they can be caused the limit to expand the use of plastics pipes. This paper studies inspection results using ultrasonic imaging method for damaged polyethylene electrofusion joints. Gas was leaking from 250mm diameter polyethylene electrofusion joints at February 2004 which was electrofused at December 1994 and operation pressure was 2.45kPa. First, surface inspection was conducted and then in order to find the types of defects examination using ultrasonic imaging method was performed. Lack of fusion and inappropriate inserting for polyethylene pipes into electrofusion coupling were found and causes of the gas leak were judged that misalignment and insert defect. Cutting inspection was performed and each inspection results were compared to. Results of ultrasonic imaging method and cutting inspection were the same.
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Field Inspection of Phase-Array Ultrasonic for PolyEthylene Electrofusion Joints
Seong Hee Kil,Young Do Jo,Kee Bong Yoon 한국가스학회 2012 한국가스학회지 Vol.16 No.1
Welding and/or fusion in polyethylene(PE) system made on site is focused on the control of the welding or fusion process to follow proper procedure. The process control is important, but it is not sufficient for the long term reliability of a pipe system. To achieve the rate of failure close to zero, Non Destructive Testing(NDT) is necessary in addition to joining process control. For electrofusion joints several non-destructive testing methods are available. The ultrasonic phased array technique is possible to detect various defects including wire deviations and regions with lack of fusion. In this studies, testing was carried to detect the defect after electrofusion joining of polyethylene piping is utilized by the ultrasonic phased array technique. From testing data, ultrasonic phased array technique is recommended as a reliable non-destructive testing method.
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Field Inspection of Phase-Array Ultrasonic for PolyEthylene Electrofusion Joints
Kil, Seong-Hee,Jo, Young-Do,Yoon, Kee-Bong The Korean Institute of GAS 2012 한국가스학회지 Vol.16 No.1
Welding and/or fusion in polyethylene(PE) system made on site is focused on the control of the welding or fusion process to follow proper procedure. The process control is important, but it is not sufficient for the long term reliability of a pipe system. To achieve the rate of failure close to zero, Non Destructive Testing(NDT) is necessary in addition to joining process control. For electrofusion joints several non-destructive testing methods are available. The ultrasonic phased array technique is possible to detect various defects including wire deviations and regions with lack of fusion. In this studies, testing was carried to detect the defect after electrofusion joining of polyethylene piping is utilized by the ultrasonic phased array technique. From testing data, ultrasonic phased array technique is recommended as a reliable non-destructive testing method.
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Seong Soo Joo, Da Woom Seo, Hee Jung Kim, Su Kil Jang, Mansig Jun 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.2
The aim of the current study was to analyze the active ingredients and to screen the pharmacological properties of freshwater laver, Prasiola japonica, the only species grown in Korea. According to results of gas chromatography-mass spectrometry assay, components from P. japonica were more diverse than those from sea laver. Of particular interest, our results indicated that ethanol extract of P. japonica (PJE) contained loliolide, sorbitol, mannitol, and alverine, which were known to have an anti-oxidant, anti-oral microbial, osmotic diuresis, and smooth muscle relaxant, respectively. In addition, five solvent fractions of PJE (water, butanol, chloroform, ethyl acetate, and hexane) significantly inhibited the production of lipopolysaccharide-induced nitric oxide and a higher amount (>100 μg/mL) of chloroform, ethyl acetate, and hexane fraction were considered to play a specific role in cancer cell death. PJE and its solvent fractions found to be effective scavengers of free radicals, particularly, hydroxyl radicals. Glucose uptake in L6 myoblast cell line that stably expresses the glucose transporter type 4 (GLUT4) proteins was also remarkably enhanced upon treatment with solvent fractions, remarkably chloroform fraction. Taken together, we concluded that P. japonica may have potent pharmacological properties and thus contribute to development of novel natural candidates for various disease targets.
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