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객체지향 및 동적연동 교육용 통계패키지 K-plot 개발
이정진,이태림,강근석,김성수,박헌진,이윤동,심송용,Lee, Jung Jin,Lee, Tae Rim,Kang, Gunseog,Kim, Sungsoo,Park, Heon Jin,Lee, Yoon-Dong,Sim, Songyong 한국통계학회 2013 응용통계연구 Vol.26 No.3
현대통계학은 많은 분야에서 사용되고 있으나 사용자들이 통계학적 개념을 이해하는데 어려움을 겪고 있다. 한편으로는 초등학생 때부터 줄기잎 그림이나, 비율자료의 원그림 등은 물론이고 평균과 같은 기술통계를 배우고 있다. 초등학교 고학년이나 중학교 저학년 학생들을 위한 직관적인 통계 패키지가 있다면 미래의 통계 사용자들인 이들 학생들이 통계적 개념을 이해하는데 많은 도움이 될 것이라고 생각하여 직관에 기초한 통계 패키지를 개발하였다. Modern statistics is used in many fields; however many users face difficulties in understanding statistical concepts. On the other hand, elementary school curriculum covers stem and leaf plot, pie chart, charts for proportional data as well as descriptive statistics including the mean. We find that an "intuitive" statistical package focused on 5-8 graders for statistical education will help future statistics users understand statistical concepts at earlier stages of their lives.
삼출성 나이관련황반변성 반대안의 새로운 신생혈관 발생 빈도
이정진,유영주,조성원,김종우,Jung Jin Lee,MD,Young Ju Lew,MD,Sung Won Cho,MD,Jong Woo Kim,MD 대한안과학회 2013 대한안과학회지 Vol.54 No.10
Purpose: To investigate the development of new choroidal neovascularization in fellow eyes of patients treated for unilateral exudative age-related macular degeneration (AMD). Methods: Three hundred fourteen patients who were first diagnosed with unilateral exudative AMD and treated with intravitreal bevacizumab or ranibizumab were studied retrospectively. Results: New exudative AMD developed in 7.0% of fellow eyes after 1 year, 10.8% after 2 years and 13.7% after more than 2 years. According to the subtype of exudative AMD, there were no significant differences between classic CNV, occult or minimally classic CNV, and PCV in the incidence of new exudative AMD. After 2 years, a higher conversion rate was found in the bevacizumab-treated group than the ranibizumab-treated group. Conclusions: The cumulative incidence of involvement in fellow eyes with exudative AMD was 13.7% over 2 years.
이정진,송광엽,박주미,Lee, Jung-Jin,Song, Kwang-Yeob,Park, Ju-Mi 대한치과의사협회 2019 대한치과의사협회지 Vol.57 No.9
Digital technology has changed various aspects of the clinical dentistry. The intraoral scanner and Computer-aided design / Computer-aided manufacturing (CAD-CAM) technology are widely used in fabricating fixed prostheses and in implant surgery. These technologies greatly improved the efficiency of clinical and laboratory procedures. With all newly introduced software, devices, and clinical studies, digital technology has been actively applied in removable prostheses. It is now possible to fabricate the removable prostheses more quickly and easily through subtractive and additive manufacturing. Various clinical and laboratory protocols were introduced by many manufacturers. The purpose of this review is to summarize the literature on digital technology for fabricating complete denture with current status and future perspectives.
Helicobacter pylori에 의해 호중구 및 위점막 세포로부터 유도되는 Leukotriene $B_4$의 생성에 미치는 Rebamipide의 영향
이정진,한복기,노재열,이광호,윤희상,김말남,정명희,Lee, Jung-Jin,Han, Bok-Gee,Ro, Jai-Youl,Rhee, Kwang-Ho,Youn, Hee-Shang,Kim, Mal-Nam,Chung, Myung-Hee 대한약리학회 1997 The Korean Journal of Physiology & Pharmacology Vol.1 No.6
Leukotrienes(LTs) are hewn to act as a mediator provoking tissue response in inflammation. This finding implicates that LTs also play important roles in the pathogenesis of H, pylori-induced gastritis and gastric ulceration. Rebamipide is being currently used as a therapeutics for gastritis and peptic ulcer, but their mechanisms of action have not been known clearly yet. One possibility is that their therapeutic effects are ascribed to interfering with the H. pylori-induced release of LTs from neutrophils and gastric mucosal cells. In the present study, this possibility was tested using $LTB_4$ as the test material in human neutrophils and Kato III cells(gastric adenoma cells as a substitute for gastric mucosal cells). The release of $LTB_4$ from both neutrophils and Kato III cells was time and H. pylori-dose dependent. The maximum release of $LTB_4$ was induced by neutrophils and Kato III cells when these cells incubated with H. pylori $(4.8{\times}10^8\;cells/ml$ for 30min. But in the presence of rebamipide the release of $LTB_4$ from these cells was suppressed in dose dependent manners. The release was completely suppressed at 1.0 mM of rebamipide in neutrophils and 2.0 mM of this drug in Kato III cells, respectively. We also obtained the results that the release of $LTB_4$ was induced by A23187$(Ca^{2+}\;ionophore)$ and the A23187-induced release was also inhibited by rebamipide. It seems that the machanism of action of rebamipide is through its interaction with the level of intracellular $Ca^{2+}$. In view of the roles of $LTB_4$ in inflammatory reaction and the roles of H. pylori in gastritis and peptic ulcer, the effects of this drug observed in this study may contribute to their therapeutic action in these gastric disorders.
지구온난화에 따른 국내 기후변화와 젖소 착유우의 생산효율에 미치는 영향 평가 : 모델 시뮬레이션을 이용한 접근
이정진,이준성,김종남,서자겸,조남철,박성민,기광석,서성원,Lee, Jung-Jin,Lee, Jun-Sung,Kim, Jong-Nam,Seo, Ja-Keum,Jo, Nam-Chul,Park, Seong-Min,Ki, Kwang-Seok,Seo, Seong-Won 한국유기농업학회 2013 韓國有機農業學會誌 Vol.21 No.4
지난 25년간 지구온난화로 인한 국내 기후변화 양상은 지역 간에 차이가 있어, 고온지역은 평균온도의 증가를 보이지는 않았으나, 최저기온의 지속적인 상승과 그에 따른 열대야 발생을 확인할 수 있었다. 또한 그로 인한 젖소의 고온스트레스 발생, 섭취량의 감소 및 생산성 저하가 예상된다. 저온지역의 경우에는 여름철 평균온도 및 최저온도의 상승으로 인해 연평균기온이 유의적으로 상승한 반면, 겨울철에는 오히려 최저기온의 지속적인 하강이 관찰됨에 따라 동물의 저온스트레스가 가중될 것으로 예상된다. 착유우가 저온스트레스 상태에 있을 때는 에너지요구량과 건물섭취량이 증가하여 생산 효율이 떨어지며, 사료효율의 감소로 경제성은 감소되고 우유 생산비는 증가한다. 특히, 극심한 저온스트레스 또는 사료, 음수 및 우사바닥의 결빙은 섭취량 감소를 야기하며 이에 따른 생산성의 저하는 더욱 가중될 것으로 예상된다. 결론적으로 지구온난화로 인한 기후변화에 따른 지역별 영향은 다르며, 온도 스트레스에 의한 낙농우의 생산성 저하를 최소화하고, 동물의 복지와 건강을 증진시키기 위해서는 지역별 기후변화 특성에 맞춘 사양기술의 개발이 필요하다. The objectives of this study were to access climate change by global warming in Korea, and to investigate its effects on production efficiency of lactating dairy cows. Two regions, Daegu and Daekwanryung, were selected to represent a warm and a cold area, respectively. Time-series analyses on meteorological records for 25 years (from January 1, 1988 to December 31, 2012) revealed significant and different climate changes in two regions. In the warm area there has been a significant (P<0.05) increase in low temperature during the summer, which can cause heat stress to the animal. On the other hand, a decrease in low temperature during the winter was observed in the cold region (P<0.01), and cold stress in winter can thus be an issue in this region. Simulations using a model integrated the Korean feeding standard for dairy cattle and the environmental effect module of Cornell Net Carbohydrate and Protein System, indicated that a reduction in feed efficiency can be a problem during the winter in the cold region while during the summer in the warm area. We conclude that the effect of climate change by global warming varies in different areas in Korea and a region-specific management strategy should be developed in order to maintain productivity, health and welfare of lactating dairy cows.
이정진,김재무,임철호,Lee, Jung Jin,Kim, Jai Moo,Lim, Cheol Ho 한국시스템엔지니어링학회 2005 시스템엔지니어링학술지 Vol.1 No.2
The Smart UAV Program was motivated by a huge potential market, a various application and future core technologies. The Smart UAV system is defined as the advanced air vehicle with the smart technology such as collision awareness and avoidance, healthy monitering and self-recovering, intelligent active control. Due to the broad interest by government, industry and academia, Smart UAV development center and government steering committee were established. The organization of the Smart UAV program consists of domestic/international companies and academia. In this paper, the process and application of system engineering was introduced for Smart UAV development program.
인터넷 기반의 해상교통관제사 훈련용 시뮬레이터에 관한 연구
이정진,송재욱,Lee, Jung-Jin,Song, Chae-Uk 해양환경안전학회 2010 해양환경안전학회지 Vol.16 No.2
해상교통관제사 훈련에 관한 IALA 권고안 및 국제 기준에 근거하여, 현재 국내에서는 세 개의 훈련과정이 개설되어 운영 중에 있으며 이러한 훈련과정의 교육 효과 증진을 위해 시뮬레이터가 도입되어 사용 중에 있다. 그러나 현재 사용되고 있는 시뮬레이터에는 관제 대상 선박의 움직임에 대한 수학모델이 부정확하고 특정한 장소에만 설치가 되어 있어서 훈련에 제약이 많은 실정이다. 이에 본 연구에서는, 정확한 선박운동 수학모델을 이용함으로써 교육 효과를 높이고, 또한 인터넷 기반으로도 훈련이 가능하도록 함으로써 장소에 제약을 받지 않는 새로운 시뮬레이터를 설계 개발하였으며, 시범 운영을 통해 시스템의 기능을 검증하고 그 활용도를 평가하였다. Basing on the recommendation and guideline of IALA, Korean VTS authority made an instruction about the training and qualification of VTS operators, and three model courses for training have been performed at a training institute which has one VTS simulator. However, the simulator has not been enough to make training fully satisfactory because of several signs of limitations including inaccurate method for calculating ship's movement and inconvenient location for training. In this paper, a new simulator was proposed to make up for the weak points replacing the current simulator. The proposed simulator adopts mathematical model for calculating exactly ship's movement which heightens the effect of training with simulator. And also it can be used through Internet so as to make long-distance training possible without visiting the training center. The effectiveness and the convenience of training with the proposed simulator are expected to be improved.
이정진,Lee, Jung Jin 한국시스템엔지니어링학회 2005 시스템엔지니어링학술지 Vol.1 No.1
This paper presents the brief generation process of system requirements for Smart UAV from a development objective. The current Smat UAV requirements deal with the restricted life cycle from development to test and verification exclusive of full life cycle because of the new technology demonstration research program funded by governments. The Smart UAV system consists of flight vehicle, avionics, communication link, payload, ground control station and ground supporting system. In this paper, top-down flown requirements are introduced how to allocate to each sub-system.
이정진,박해기,Lee, Jung-Jin,Park, Hae-Ki 한국통계학회 2010 Communications for statistical applications and me Vol.17 No.4
규칙기반 분류분석(rule-based classification analysis)은 직관적인 이해가 쉽고 알고리즘이 복잡하지 않아 최근 대용량 데이터마이닝에 많이 이용되는 기법이다. 하지만 현재의 규칙기반 분석은 여러 개의 규칙들을 찾은후 이 규칙들을 단순히 다수결이나 또는 중요도의 가중 합으로서 새로운 데이터를 분류한다. 본 연구에서는 다항분포를 이용한 이항데이터의 분류분석 기법을 규칙 조합방법에 응용하고자한다. 다향분포의 추정을 위해서는 변형된 반복 비율 적합(iterative proportional fitting; IPF) 알고리즘을 이용하여 최대 엔트로피 분포(entropy distribution)를 찾는다. 시뮬레이션 실험 결과 이 방법은 두 집단의 데이터가 서로 유사한 경우 어느 정도 의미 있는 분류 결과를 보여주였다. Rule-based classification analysis is widely used for massive datamining because it is easy to understand and its algorithm is uncomplicated. In this classification analysis, majority vote of rules or weighted combination of rules using their supports are frequently used in order to combine rules. We propose a method to combine rules by using the multinomial distribution in this paper. Iterative proportional fitting algorithm is used to estimate the multinomial distribution which maximizes entropy constrained on rules' support. Simulation experiments show that this method can compete with other well known classification models in the case of two similar populations.