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김현중,김우환,이상철,임종호,조상희,김아현,Kim, Hyun-Joong,Kim, Woo-Hwan,Lee, Sang-Cheol,Im, Jong-Ho,Cho, Sang-Hee,Kim, Ah-Hyoun 한국통계학회 2008 Communications for statistical applications and me Vol.15 No.5
본 논문은 금융기관에서 활용하고 있는 운영리스크 측정모형에 대한 적합성검증 방법 중 안정성 검증에 관한 것이다. 신용리스크와는 달리 운영리스크는 손실자료의 특징, 과거 자료의 부족 그리고 적합성검증을 위한 이론적 도구의 부족 등으로 인해 현재 적절한 적합성검증 방안에 제시되지 못하고 있다. 본 논문에서는 운영리스크 VaR(Value at Risk) 추정값의 안정성을 평가하는 적합성검증 방법을 제시하고 이를 활용한 실증분석을 통해 제안된 방법에 대한 실제적 활용 가능성을 확인해 보고자 한다. 구체적으로 본 논문에서는 붓스트랩 방법을 활용하여 운영리스크 VaR의 신뢰구간을 생성함으로써 운영리스크 VaR 추정값의 안정성을 검증하는 기법을 제안하였으며, 이를 토대로 적합에 따른 운영리스크 VaR 추정값의 안정성을 측정하는 방안도 제시하였다. Operational risk is defined as the risk of loss resulting from inadequate or failed internal processes, people and systems, or external events. The advanced measurement approach proposed by Basel committee uses loss distribution approach(LDA) which quantifies operational loss based on bank's own historical data and measurement system. LDA involves two distribution fittings(frequency and severity) and then generates aggregate loss distribution by employing mathematical convolution. An objective validation for the operational risk measurement is essential because the operational risk measurement allows flexibility and subjective judgement to calculate regulatory capital. However, the methodology to verify the soundness of the operational risk measurement was not fully developed because the internal operational loss data had been extremely sparse and the modeling of extreme tail was very difficult. In this paper, we propose a methodology for the validation of operational risk measurement based on bootstrap confidence intervals of operational VaR(value at risk). We derived two methods to generate confidence intervals of operational VaR.
김현중,김민수,박영재,이은용,Kim, Hyun-joong,Kim, Min-soo,Park, Young-jae,Lee, Eun-yong 대한침구의학회 2004 대한침구의학회지 Vol.21 No.6
Objective : This study was performed to examine the Magnetic therapy decrease the allergic reaction of Bee Venom. Methods : We injected BV to sample group(n=10) and control group(n=10) at 2 points of body, and also sample group was treated with Magnetic therapy additionally. We observed the change of local pain, pruritus, color difference value at 1 hour, 24 hours after injection. Results : Local pain, pruritus and color difference value of sample group were more decreased than control group. Conclusions : The Magnetic therapy decreased allergic reaction of Bee Venom.
토양에서 분리한 국내 미기록종 Pseudomonas 속 6종의 생화학적 특성과 계통 분류
김현중,정유정,김해영,허문석,Kim, Hyun-Joong,Jung, You-Jung,Kim, Hae-Yeong,Hur, Moonsuk 한국미생물학회 2019 미생물학회지 Vol.55 No.1
생명공학산업의 주요한 자원인 미생물의 가치는 날로 증대하고 있으며, 이로 인해 생물자원을 확보하기 위한 국가간의 경쟁은 심화되고 있다. 이에 다양한 환경에서 미생물자원을 발굴하고 특성을 확인하는 것은 미래의 잠재적 생물자원을 확보하는데 큰 의미가 있다. 본 연구에서는 Pseudomonas속에 속하는 6종의 미생물들을 일반 토양에서 분리하여 분자계통학적 분석을 통해 국내 미기록종임을 확인하였다. 본 연구로 확보된 미생물들은 자생 생물자원의 다양성을 늘리고, 산업계에 생물자원의 선택의 폭을 늘리는데 도움이 될 것으로 기대된다. In 2017, as a study to discover indigenous prokaryotic species in Korea, a total of 6 bacterial strains assigned to the genus Pseudomonas were isolated from soil. From the high 16S rRNA gene sequence similarity (${\geq}99.5%$) and phylogenetic analysis with closely related species, the isolated strains were identified as independent Pseudomonas species which were unrecorded in Korea. The six Pseudomonas species were Pseudomonas mandelii, P. canadensis, P. thivervalensis, P. jessenii, P. lurida, and P. brenneri. Gram reaction, culture conditions, colony and cell morphology, basic physiological and biochemical characteristics are described in the species description section.
김현중,Kim Hyun-Joong 한국통계학회 2006 응용통계연구 Vol.19 No.1
CART로 대표되는 의사결정나무의 알고리즘에서 가장 중요한 요소는 분리변수의 선택방법이다. 대부분의 알고리즘은 변수의 형태가 연속형인지, 혹은 명목형(nominal)인지에 따라 별개의 변수선택방법을 적용한다. 하지만 변수의 형태가 순서형(ordinal)인 경우에는 그 변수를 연속형으로 취급하여 연속형 변수선택방법을 적용하는 것이 대부분이다. 이것은 CART와 같은 Greedy탐색을 이용하는 방법에는 문제점이 발생하지 않는다. 하지만 Greedy탐색의 약점을 보완하기 위해 통계이론을 이용하여 개발된 최근의 방법들에는 최선의 대처방법이 아니다. 따라서 본 연구에서는 의사결정 나무에서 분리변수를 선택하는데 있어서 비모수적 접근 방법인 Clamor-von Mises 검정을 이용한 방법을 순서형 변수에 사용하는 것을 제안하고, CART, C4.5, QUEST, CRUISE등 기존 알고리즘과 본 연구에서 제안하는 방법의 순서형 변수 선택력을 비교하였다. 모의실험의 결과, Clamor-von Mises 검정을 이용한 변수선택방법은 순서형 변수의 분류력을 기존 방법들에 비해 더 정확히 예측하는 좋은 성과를 보여주었다. The most important component in decision tree algorithm is the rule for split variable selection. Many earlier algorithms such as CART and C4.5 use greedy search algorithm for variable selection. Recently, many methods were developed to cope with the weakness of greedy search algorithm. Most algorithms have different selection criteria depending on the type of variables: continuous or nominal. However, ordinal type variables are usually treated as continuous ones. This approach did not cause any trouble for the methods using greedy search algorithm. However, it may cause problems for the newer algorithms because they use statistical methods valid for continuous or nominal types only. In this paper, we propose a ordinal variable selection method that uses Cramer-von Mises testing procedure. We performed comparisons among CART, C4.5, QUEST, CRUISE, and the new method. It was shown that the new method has a good variable selection power for ordinal type variables.
일부 농업인에서의 농약 중독증상과 농약 사용정보에 대한 예비조사
김현중,차은실,문은경,고유선,김재영,정미혜,이원진,Kim, Hyun-Joong,Cha, Eun-Shil,Moon, Eun-Kyeong,Ko, You-Sun,Kim, Jae-Young,Jeong, Mi-Hye,Lee, Won-Jin 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.1
This study aimed to determine the feasibility of survey questionnaires for pesticide poisoning. We conducted a pilot study to develop a questionnaire for evaluating pesticide poisoning symptoms and to examine the validity of self-reported information for individual pesticides used. In December 2010 we interviewed 20 farmers with self-reported pesticide poisoning histories residing in Gyeonggi Province. For validity of pesticide information, the purchased pesticide lists from the agricultural cooperative federation were compared with individual self-reported pesticides used. Neurological symptoms were the most common among clinical symptoms related to pesticide poisoning, followed by gastrointestinal, dermal and eye symptoms. Insecticides were the main causative pesticide class for poisoning. Twenty one major symptoms were selected for screening for acute pesticide poisoning in a field study based on the pilot results and literature reviews. Substantial under-reporting was found in data on self-reported individual pesticides used (9.2%), as well as low accuracy (36%) compared with their actual purchase lists. In this pilot study, we suggest the selected symptom lists may apply to a field survey of pesticide poisoning. However, the self-reported information on individual pesticides may not be valid and alternative methods need to be developed.
토목섬유로 보강한 흙 시료의 일축 및 삼축 압축거동 해석
김현중,김윤진,변성원,주창환,전한용,Kim, Hyun-Joong,Kim, Yoon-Jin,Byun, Sung-Won,Jo, Chang-Whan,Jeon, Han-Yong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3
In this study, the effects of geosynthetics reinforcements on compressive behaviors of weathered granite soils were investigated by uni-axial and tri-axial compression tests. Geogrid, geomat, and polyethylene slit film fiber were used as reinforced geosynthetis. From the experimental results, these geosynthetics reinforcement effects could increase the compressive strength of soil and especially, the reinforced effects of geogrid and geomat were extremely excellent compared to polyethylene slit film fiber reinforced. This effect is larger for 3 layer geosynthetics used. For triaxial compression test, despite unconsolidated undrained condition, it is seen that the increasing shear strength of the weathered granite soils is due to the increasing adhesive power.