RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      • 좁혀본 항목

      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 원문제공처
        • 등재정보
        • 학술지명
        • 주제분류
        • 발행연도
        • 작성언어
        • 저자

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • KCI등재
      • KCI등재후보

        자동차 디스크 브레이크의 종류 별 내구성 해석

        이정호,조재웅 사단법인 인문사회과학기술융합학회 2015 예술인문사회융합멀티미디어논문지 Vol.5 No.6

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        제동장치로 현재 디스크 브레이크가 보편적으로 사용되고 있으며, 자동차의 운동에너지를 단시간에 열에너지로 전환하여 자동차를 감속 또는 정지시킨다. 그러나 미끄럼마찰에 의한 높은 온도와 압력하의 상당히 가혹한 환경에서 작동되기 때문에 튼튼한 내구성을 갖는 것이 필수적이다. 본 연구에서는 시중에 판매되고 있는 고정 및 부동 캘리퍼 형에 따른 세 가지 형상의 디스크 브레이크들을 모델링하여 ANSYS 유한요소 해석 프로그램으로서 구조 및 열 해석을 수행하였고, 그 해석 결과들을 종합하여 비교한다. 단순히 제동력만을 디스크 브레이크 모델에 가하였을 시, 그에 대한 최대 변형과 최대 응력으로서의 발생량들은 크지는 아니하였다. 그러나 제동력과 마찰열에 따른 온도와 열대류 조건을 전부 고려하였을 때 최대 변형과 최대 응력은 매우 증가하는 것을 확인할 수 있었다. 본 연구 결과들을 바탕으로 각 디스크 브레이크의 시뮬레이션 해석을 통한 그 내구성을 연구함으로써 보다 안전한 디스크 브레이크의 설계에 기여할 수 있다고 사료된다. Disk brake has been used generally as braking system at present. The kinetic energy of car is transformed into the thermal energy in a short time by disk brake and the car is to reduce the speed or stop. But it is indispensible to have the strong durability because the disk brake is operated at the considerably severe environment under the high temperature and pressure. In this study, three kinds of disk brakes according to the fixed and floating caliper types being on sale in the open market are modelled. The structural and thermal analyses are carried out with the finite element analysis program of ANSYS. The analysis results are also synthesized and compared. When only a simple braking force is applied to disk brake, the quantities happened as the corresponding maximum deformation and stress do not become large. But the maximum deformation and stress are confirmed to be quite increasing when considering the conditions of temperature and thermal convection due to braking force and fractional heat altogether. As the durability through the simulation analysis of each disk brake is studied on the background of this study result, it is thought to be contributed to more safe design of disk brake

      • KCI등재후보

        하절기 한지형 잔디 재배 시 침수 및 고온으로 인한 잔디의 생육 불량 현상

        이정호,최준용,이성호,주영규 한국잔디학회 2008 Weed & Turfgrass Science Vol.22 No.2

        The growth of root and shoot normally decline dramatically in mid-summer of Korea, moreover the cool-season turfgrassgrass eventually wither to death over 30oC. The increase of air temperature also drives the heat of soil, that makes stress on root system. The heat stress affects physiological mechanisms of hormonal unbalance that stimulates shoot growth, photosynthesis, and transpiration. To solve those problems, many studies have been carried out to control soil moisture and OM content to decrease soil temperature for dissolving the growth retardant by heat stress. This study initiated to analyze the change of soil temperature with soil moisture, and the effect of soil depth and moisture content on heat transmit and thermal changes on turfgrass growth(productivity, green color, and damage by dryness and high temperature). Kentucky bluegrass plots prepared with 25%, 33%, 40% soil moisture treatments. Soil temperature was measured every five min. with four thermo-sensors at 12 and 2 cm soil depth. The most acceptable growth showed at 33% soil moisture, but the worst result showed at 40%. The soil moisture seriously affected on the growth of Kentucky bluegrass, however the quality of turfgrass may acceptable if we can control soil moisture down to 33% when the flooding season of monsoon. The growth of root and shoot normally decline dramatically in mid-summer of Korea, moreover the cool-season turfgrassgrass eventually wither to death over 30oC. The increase of air temperature also drives the heat of soil, that makes stress on root system. The heat stress affects physiological mechanisms of hormonal unbalance that stimulates shoot growth, photosynthesis, and transpiration. To solve those problems, many studies have been carried out to control soil moisture and OM content to decrease soil temperature for dissolving the growth retardant by heat stress. This study initiated to analyze the change of soil temperature with soil moisture, and the effect of soil depth and moisture content on heat transmit and thermal changes on turfgrass growth(productivity, green color, and damage by dryness and high temperature). Kentucky bluegrass plots prepared with 25%, 33%, 40% soil moisture treatments. Soil temperature was measured every five min. with four thermo-sensors at 12 and 2 cm soil depth. The most acceptable growth showed at 33% soil moisture, but the worst result showed at 40%. The soil moisture seriously affected on the growth of Kentucky bluegrass, however the quality of turfgrass may acceptable if we can control soil moisture down to 33% when the flooding season of monsoon.

      • 1P-487 Influence of hexamethyldisilazane change the mesoporous TiO<sub>2</sub> surface property

        이정호,박수빈,김지만 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

        Titanium dioxide (TiO<sub>2</sub>) has got a great attention in various fields due to its differentiated advantages from the others: high band gap energy, high stability and catalytic activity, and non-toxicity. The photocatalytic activity of TiO<sub>2</sub> has been considered to be determined by the crystalline phase, crystal size, and specific surface area. To improve the photocatalyic activity of TiO<sub>2</sub>, small size and high crystallinity of nanoparticles have been used. Mesoporous TiO<sub>2</sub> has a large surface area because of its high surface to volume ratio, and so it should in principle have high photochemical sterilization, because of the improved access to the active sites of TiO<sub>2</sub>. The active site of TiO<sub>2</sub> was originated from surface hydroxyl groups. In this study, we prepared mesoporous TiO<sub>2</sub> for the purpose of its usages by surface modification with hexamethyldisilazane. Here, we controlled the surface hydrophobicity from hydrophobic TiO<sub>2</sub> surface in order to activate or deactivate the TiO<sub>2</sub> surface.

      • KCI등재
      • KCI등재

        셀프서비스 기술의 품질차원과 고객만족의 관계

        이정호 한국유통경영학회 2019 유통경영학회지 Vol.22 No.5

        Purpose: The number of self-service technology users has recently increased in steep, which started to distributors more opportunities to enter into new service delivery system. Along with the growing importance of quality factors, and self-service technology convenience, there have been voices over the need of systematic research into verification of the relationship between those related variables by breaking down either self-service technology quality or perceived satisfaction in multidimensional aspects, which has been studied form a single dimensional perspective. Therefore, this study investigates how the self-service technology quality from a multidimensional perspective of the construct affects perceived satisfaction. And this study is to provide the quality factors which influence customer satisfaction in self-service technology and to examine the mediating effect of perceived service quality on these casual relationships. Research design, data, and methodology: This study presents a new modified Information System Success Model for measuring quality factors of self-service technology and investigates relationships between these factors and customer satisfaction. This study was conducted a survey targeting the self-service technology users and collected 209 questionnaires in Korea. The data collected through the survey was analyzed using measurement model analysis by using SPSS 22.0 and AMOS 20.0. The test methods of the hypotheses are correlation analysis, regression analysis, and mediated regression analysis. In particular, the measurement model used for this study divided quality of self-service technology into two dimensions such as information quality and system quality. And the mediated regression analysis tested the hypotheses for this study. Results: The results of this study are as follows; regarding the influence of quality dimension of self-service technology on customer satisfaction, it was found that the effects of information quality and system quality were significant on customer satisfaction. And it was found that information quality has stronger positive effect on customer satisfaction than system quality, which in turn, there is full mediating effects of perceived service quality on these relationships. Conclusions: The great spread of self-service technologies is driving distributors to reshape their service delivery systems, which started to them more opportunities to improve operating efficiency. This study can provide implications for quality strategy and effective alternatives for operating self-service technologies.

      • KCI등재

        Pilgrimage to the Holy River Ganges: Its Manifestation in Indian Literature

        이정호 한국외국어대학교 인도연구소 2012 남아시아연구 Vol.18 No.1

        There is a unique religious ritual, called 'Pilgrimage to the Holy Land' in Hindu India. In India, there are lots of holy places but the Ganges is considered as the most important holy place by the Hindus. The Ganges is a symbol of Hindu culture and civilization which have been changed constantly and it is the most Holy River. Its water is accepted as Sacred Water. The myths of the Ganges mentioned in Rig Veda(BC 12) and Ramayana are innumerable. In this paper, I examine the myths of the Ganges, the story about the Ganges which flows in heaven, then came down to the ground, and the story of severe penance done by descendants to save their ancestors and give them salvation with that water. Also, this paper was focused on the image of the Ganges shown in contemporary literature of major Indian writers. The poem 'Jan-Gan-Man' that is written about the sancity and dynamic of the Ganges by Taogre becomes India's national anthem. It is a song which prays dream, hope and victory of India. I choose Gitanjali(35) to show that India is Holy Land and it has the future image of colonial India which pursues more higher dream, liberality, truth and rationality.

      • KCI등재후보

        Molecular Characterization of the Ocular EST Clones from the Olive Flounder, Paralichthys olivaceus

        이정호,노재구,김현철,박철지,민병화,하수진,박종원,김영옥,김종현,김경길,김우진,명정인 한국발생생물학회 2010 발생과 생식 Vol.14 No.2

        The olive flounder (Paralichthys olivaceus) is one of the most widely cultured flatfish in Korea and Japan. During development, in a process known as metamorphosis, this fish reorients itself to lie on one side, the body flattens, and the eye migrates to the other side of the body. However, few studies have focused on molecule regulation mechanism of eye development in olive flounder. To reveal the molecular mechanism of eye development, we performed the studies on identification of genes expressed in the eye of olive flouner using EST and RT-PCR strategy. A total of 270 ESTs were sequenced, and 178 (65.9%) clones were identified as known genes and 92 (34.1%) as unknown genes. Among the 178 EST clones, 29 (16.3%) clones were representing 9 unique genes identified as homologous to the previously reported olive flounder ESTs, 131 (73.6%) clones representing 107 unique genes were identified as orthologs of known genes from other organisms. We also identified a kind of eye development associated proteins, indicating EST as a powerful method for identifying eye development-related genes of fish as well as identifying novel genes. Further functional studies on these genes will provide more information on molecule regulation mechanism of eye development in olive flounder. Key words : Olive flounder, Eye, Expressed sequence tags (ESTs), Expression profile, Developmental biology.

      맨 위로 스크롤 이동