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Concordance Analysis를 이용한 임도개설의 순위결정에 관한 연구
차두송,김종윤,정도현,지병윤 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-
이 논문은 Scoring법의 Concordance Analysis를 이용하여 전국 11개 지역을 대상으로 임도노선의 개설순위를 결정하였다. 그 결과 우위성 지수(Concordance Index)에 의한 임도개설 우선순위는 대상지역 9 > 5 > 11 > 10 > 6 > 1 > 3 = 4 > 2 > 7 > 8으로 나타났으며, 열세성지수(Dis-concordance Index)에 의한 임도개설 우선순위는 대상지역 9 > 3 > 4 > 5 > 10 > 8 > 1 > 11 > 6 > 7 > 2로 나타났다. By the means of concordance analysis among scoring methods, this study was to determine the priority order of forest road construction in 11 areas. The results have shown that the Priority order by concordance index was ranked by area 9, 5, 11, 10, 6, 1, 3=4, 2, 7 and 8, and that by dis-concordance index by area 9, 3, 4, 5, 10, 8, 1, 11, 6, 7 and 2.
지병윤 ( Ji Byeong Yun ),차두송 ( Cha Du Song ),정도현 ( Jeong Do Hyeon ),오재헌 ( O Jae Heon ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.4
The subject for this study is to construct the environmentally friendly forest road that prevents fill slope failure from forest road disaster. This study was carried out to evaluate factors and to make the failure prediction table on the fill slope failure of forest road using Quantification theory(Ⅱ) in igneous rock area of jamgok, Cheorwon, Gangwon-Do, and the failure prediction table applied to other area. The results were summarized as follows; 1. the evaluation of factors by the partial correlation coefficients and range values appears that fill slope failure is closely related to factors such as fill slope length, soil types and fill slope gradient. 2. According to the category weight for each factor, the fill slope failure was mainly occurred in fill slope length greater than 12m, soil among soil types, fill slope gradients ranged from 30 to 35, slope gradient steeper than 35, northern aspect, ridge portion among road position and longitudinal gradient steeper than 6(10.5%). 3. The failure prediction table was manufactured by discriminant analysis formula using Quantification theory(Ⅱ). The results that applied the failure prediction table to Yangpyong, Gyeonggi-Do were showed that the discriminant ratios was 72.3%, and therefore appeared that the failure prediction table was available for other area.
상용 부품 비정형 데이터와 인공 신경망을 이용한 부품 단종 예측 방안 연구
박연경(Yun-kyung Park),이익도(Ik-Do Lee),이강택(Kang-Taek Lee),김두정(Du-Jeoung Kim) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.10
기술의 발전으로 다양한 부품의 개발 및 상용화는 가능 하였으나, 이에 따라 부품의 단종 주기는 단축 되었다. 이는 수천 품목 이상의 부품을 활용하여 개발하고, 장기간 운영하는 무기체계의 수리 부속 보급을 어렵게 하였으며, 무기체계 운용 가용도 저하의 주요 원인으로 작용하였다. 이러한 문제를 해결하기 위하여 미국 등은 전담 기구를 만들어 대응하고 있으며, 국내에서는 상용 부품단종 예측도구를 활용하여 단종을 예측하고 관리하고 있다. 하지만 상용 부품단종 예측도구에서 단종 정보가 제시되지 않는 부품에 대한 대응 및 관리는 부재한 실정이다. 이에 본 연구에서는 상용부품단종 예측도구에서 제공하는 부품에 대한 정형, 비정형 빅데이터를 수집하고, 데이터 전처리 및 Embedding 과정을 거쳐, 신경망 학습 알고리즘을 적용하여, 상용 부품에 대한 단종 정보 (LC Risk, YTEOL)를 예측하는 방안을 제시하였다. 또한 제시된 모델의 예측 성능을 데이터 기술 통계량과 비교 평가 하여. 본 연구에서 제시한 학습 모델의 타당성을 검증 하였다. 결론에는 본 연구의 활용 방안과 한계점 및 발전 방향에 대하여 기술 하였다. Advances in technology have allowed the development and commercialization of various parts; however this has shortened the discontinuation cycle of the components. This means that repair and logistic support of weapon system which is applied to thousands of part components and operated over the long-term is difficult, which is the one of main causes of the decrease in the availability of weapon system. To improve this problem, the United States has created a special organization for this problem, whereas in Korea, commercial tools are used to predict and manage DMSMS. However, there is rarely a method to predict life cycle of parts that are not presented DMSMS information at the commercial tools. In this study, the structured and unstructured data of parts of a commercial tool were gathered, preprocessed, and embedded using neural network algorithm. Then, a method is suggested to predict the life cycle risk (LC Risk) and year to end of life (YTEOL). In addition, to validate the prediction performance of LC Risk and YTEOL, the prediction value is compared with descriptive statistics.
Boost 컨버터와 계통연계 인버터를 이용한 풍력발전의 센서리스 MPPT 제어
김도윤(Do Yun Kim),나재두(Jae Du La),김영석(Young Seok Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
This paper proposes the control method of maximum power point tracking for the wind energy generation system using the duty ratio control of boost type DC-DC converter. For a lower cost and a higher reliability, the wind and the generator velocity sensors are removed. The boost converter duty switching performs MPPT(maximum power point tracking) control. Chain rule is applied by using each function, the grid side inverter is controlled to regulate unity power factor. Proposed control method was analyzed mathematically and tested by the computer simulation using Psim.
Choi, Du Ri,Jeong, Ji Heun,Yu, Kwang-Sik,Lee, Nam-Seob,Jeong, Young-Gil,Kim, Do Kyung,Na, Chun Soo,Na, Dae Seung,Hwang, Won Min,Han, Seung-Yun D.A. Spandidos 2018 Experimental and therapeutic medicine Vol.15 No.4
<P>Ischemia-reperfusion injury (IRI) may cause acute kidney disease (AKD) by mediating the oxidative stress-induced apoptosis of parenchymal cells. The extract of <I>Rhus verniciflua</I> Stokes (RVS) is used as a traditional herbal medicine as it exhibits anti-oxidant, anti-apoptotic and anti-inflammatory properties. Therefore, the current study investigated the therapeutic effect and the underlying mechanism of RVS on IRI-induced AKD <I>in vivo</I> and <I>in vitro</I>. The current study assessed the effects of RVS on a mouse model of renal IRI and in hypoxic human renal tubular epithelial HK-2 cells. The results demonstrated that the IRI-induced elevation of blood urea nitrogen, serum creatinine and lactate dehydrogenase was significantly attenuated by the intraoral administration of RVS (20 mg/kg/day) for 14 days prior to surgery. It was demonstrated that IRI surgery induced histological damage and cellular apoptosis in renal parenchyma, which were attenuated by pretreatment with RVS. Furthermore, in HK-2 cells incubated with 300 µM CoCl<SUB>2</SUB> to induce chemical hypoxia, it was demonstrated that RVS treatment significantly inhibited cell death and the production of reactive oxygen species (ROS). Furthermore, RVS treatment upregulated the levels of endogenous antioxidant enzymes, including heme oxygenase-1 and catalase, as well as their upstream regulator nuclear factor erythroid 2-related factor 2, in HK-2 cells. Taken together, these results suggested that the intraoral administration of RVS induces a therapeutic effect on IRI-induced AKD. These effects are at least partly due to the attenuation of ROS production via upregulation of the antioxidant defense system in renal tubular cells.</P>
대형디젤기관에서의 연속재생방식 DPF와 Cooled EGR 성능
윤두호(Du-Ho Yun),문병철(M.B.Chul),오상기(Sang Ki Oh),백두성(Do Sung Baik),한영출(Young-Chool Han) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The world is faced against the serious problems related to the increasing air pollutions. This research focused on the principle and the development of continuous regeneration DPF and cooled EGR technology which were the after-treatment technologies due to its superior comparability ad possible applicability. The test was done on an 8000cc heavy-duty turbo diesel engine on which continuous regeneration DPF was installed in order to investigate regeneration characteristics of DPF and cooled EGR and engine performance under several conditions of standard diesel or 50ppm ultra low sulfur diesel. Besides exhaust emissions, CO, HC and PM were tested under D-13 mode.
지병윤 ( Byoung Yun Ji ),황진성 ( Jin Sung Hwang ),정도현 ( Do Hyun Jung ),차두송 ( Du Song Cha ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-
기본설계를 위한 노선 선형을 결정하기 위하여 양각기 계획법(Divider step method)으로 지형도 상에서 허용 종단기울기 내의 최종 노선을 결정하고, 임도시설기준의 기본 값을 적용하여 일괄적으로 설계가 실행되는 임도 개략 설계 프로그램을 개발하였다. 수치지형도(1:5,000)를 기초자료로 활용하여, 기본적인 지형분석을 실시하고, 허용 종단기울기 내에서 사용자가 시점과 종점간의 임도 예정 노선을 선정하게 된다. 선정된 노선은 임황과 지황 등의 기본출력자료를 바탕으로 임도 예정 노선의 적정성을 판단하게 되며, 부적합시 노선을 재배치하여 적정 임도 노선이 선정 될 때까지 반복한다. 최종 임도노선이 선정되면 노선상의 IP점을 추출하여 설계기준 기본 값에 의하여 자동적으로 설계가 이루어진다. 출력된 설계도면의 검토를 통하여 만족한 결과를 얻게 되면 설계도면 및 공사수량 내역을 작성하도록 하였다. 개략 설계를 위한 기본적인 설계 인자들(곡선반지름, 사면안정구조물의 종류ㆍ위치ㆍ규격, 시공단가 등)은 사용자가 프로그램 초기설정 화면에서 직접 입력하게 되며, 자동으로 처리된 설계 도면은 수정사항이 있는 것우 사용자임의로 수정이 가능하다. The schematic forest road design program is developed to determine the route for the basic design by deciding the final route within the longitudinal grade permitted by the topographic map through the divider step method, and also to apply the default value of the forest road facility standard in order to implement the design in a uniform manner. The user selects the start point and the end point of the expected forest road route within the permitted longitudinal grade using the topographic map (1:5,000) as basic data and performing basic terrain analysis. The adequacy of the expected forest road route is determined by basic output data such as stand condition and site condition of the selected route, and if the route is found inadequate then the relocation process will be repeated until the optimal forest road route is selected. When the final forest road route is selected, IP points of the route are extracted for an automatic design process based on the default value of the design standards. Drawings and detail statement of design are drawn up if satisfactory results are obtained through the assessment of the output design drawings. The basic design factors(Radius of curvature, typeㆍ locationㆍspecifications of slope stability structures, construction unit price, etc.) for the schematic design are manually entered by the user at the initial setup screen of the program, and optional modifications are possible by the user for automatic processed design drawings.