• 제목/요약/키워드: planet

검색결과 359건 처리시간 0.038초

국내 패션기업의 CSR 활동 -기업 웹사이트를 중심으로- (Corporate Social Responsibility -Contents Analysis of Korean Fashion Corporations Websites-)

  • 안수경;류은정
    • 한국의류학회지
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    • 제35권4호
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    • pp.455-465
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    • 2011
  • This study explores the CSR activities of Korean fashion corporations. A contents analysis of corporate websites was carried out to investigate the structure and function of their websites and the activity dimensions related to the CSR of Korean fashion corporations. The subjects were the Korean top 100 fashion corporations according to total sales in 2009. The findings throughout the research are as follow. First, a total of 46 corporations created the contents about CSR activities on their websites. A total of 32 of them communicated their CSR activities on the main menu at the intro page of the website. Second, the CSR activities of Korean fashion corporate were classified the 3P dimensions, profit (economic responsibilities), planet (environmental responsibility), and people (social responsibility). We found a total of 228 CSR issues for Korean fashion corporations. The issues included in the people dimension were 71.0%, planet issues 16.7%, and profit issues 12.3%. The most significant issue was the economic support responsibility to social organizations included in the people dimension.

고밀도 지상강우관측망을 활용한 서울지역 정량적 실황강우장 산정 (Quantitative Precipitation Estimation using High Density Rain Gauge Network in Seoul Area)

  • 윤성심;이병주;최영진
    • 대기
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    • 제25권2호
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    • pp.283-294
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    • 2015
  • For urban flash flood simulation, we need the higher resolution radar rainfall than radar rainfall of KMA, which has 10 min time and 1km spatial resolution, because the area of subbasins is almost below $1km^2$. Moreover, we have to secure the high quantitative accuracy for considering the urban hydrological model that is sensitive to rainfall input. In this study, we developed the quantitative precipitation estimation (QPE), which has 250 m spatial resolution and high accuracy using KMA AWS and SK Planet stations with Mt. Gwangdeok radar data in Seoul area. As the results, the rainfall field using KMA AWS (QPE1) is showed high smoothing effect and the rainfall field using Mt. Gwangdeok radar is lower estimated than other rainfall fields. The rainfall field using KMA AWS and SK Planet (QPE2) and conditional merged rainfall field (QPE4) has high quantitative accuracy. In addition, they have small smoothed area and well displayed the spatial variation of rainfall distribution. In particular, the quantitative accuracy of QPE4 is slightly less than QPE2, but it has been simulated well the non-homogeneity of the spatial distribution of rainfall.

METEOROID STREAM 입자들의 궤도 운동 시뮬레이션 TOOL 개발 (DEVELOPMENT OF SIMULATION TOOL FOR ORBITAL MOTION OF METEOROID STREAM PARTICLES)

  • 김방엽
    • Journal of Astronomy and Space Sciences
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    • 제17권1호
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    • pp.107-116
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    • 2000
  • 본 연구는 지구 공전 궤도 근처의 Leonid의 출현 빈도와 속도 등을 예측하기 위한 연구의 초기 단계로서 meteoroid에 대한 기초 자료 조사와 더붙어 기존에 알려져 있는 meteoroid 입자의 분출 속도 모텔과 섭동 모델로부터 meteoroid의 운동 방향과 속도를 컴퓨터로 계산하기 위한 프로그램을 개발하고 이것을Leonid stream에 적용해 보았다. 입자의 초기 속도 모델로는Jones의 분출속도 분포모델을 사용하였으며, meteoroid의 궤도 운동 모델에는 태양과 달, 지구를 비롯한 각 행성들의 섭동 모델이 포함되었다. 태양계 천체들의 Ephemeris를 구하기 위해 JPL (Jet Propulsion L Laboratory)의 SSD (Solar System Dynamics) Laboratory에서 개발된 DE405 Solar System E Ephemeris 데이터 파일을 사용하였다. 이외에 중요한 섭동 요소로써 태양 복사압을 고려하였으며, 적분 알고리즘으로는 8차 Runge-Kutta 방법을 사용하였다.

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캐리어의 핀홀 위치 오차에 따른 유성기어의 하중 분할 및 하중 분포 영향 분석 (Effect Analysis of Carrier Pinhole Position Error on the Load Sharing and Load Distribution of a Planet Gear)

  • 김정길;박영준;이근호;김영주;오주영;김재훈
    • 한국기계가공학회지
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    • 제15권5호
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    • pp.66-72
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    • 2016
  • Gearboxes are mechanical components that transmit power by adjusting input and output speed and torque. Their design requirements include small size, light weight, and long lifespan. We have investigated the effects of carrier pinhole position error on the load sharing and load distribution characteristics of a planetary gear set with four planet gears. The simulation model for a simple planetary gear set was developed and verified by comparing analytical results with a putative model. Then, we derived the load sharing and load distribution characteristics under various pinhole position error conditions using the prototypical simulation model. The results showed that the mesh load factor and face load factor increased with the pinhole position error, which then influenced the safety factor for tooth bending strength and surface durability.

파이선 스크립트를 이용한 태양계 행성 시뮬레이터 구현 (Implementing Solar System Simulator using Python Script)

  • 최은영;이임건
    • 한국컴퓨터정보학회논문지
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    • 제20권4호
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    • pp.49-56
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    • 2015
  • 본 논문에서는 3D 애니메이션 도구인 마야를 이용하여 태양계를 모델링하고 각 행성의 움직임과 물리적인 속성들을 정밀하고 객관적으로 구현하여 태양계의 구조를 시각적으로 쉽게 이해할 수 있도록 시뮬레이터를 구현하였다. 메뉴를 이용한 마야의 모델링으로는 정밀한 물리적 속성 값을 표현하기 어려우므로 파이선 스크립트를 이용하여 각 행성의 특성을 표현하였다. 제안하는 시뮬레이터는 가상현실 분야나 학생들의 교육 자료로서 사용 가능하도록 모델링과 렌더링을 실사와 동일하게 구현하였다. 또한 마야 애니메이션에서의 메뉴를 이용한 모델링과 스크립트 언어인 파이선을 활용하여 누구라도 쉽게 실사 영상을 볼 수 있도록 하였다.

링기어의 경계조건이 가공오차를 가지는 유성기어열의 정특성에 미치는 영향 (Influence of Ring Gear Boundary Conditions on the Static Characteristics of Epicyclic Gear Trains with Manufacturing Errors)

  • 천길정
    • 대한기계학회논문집A
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    • 제27권11호
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    • pp.1949-1957
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    • 2003
  • A hybrid finite element analysis was used to analyze the influence of ring gear rim thickness and spline number on the static properties of a planetary gear system with manufacturing errors. Both of these parameters affected the bearing force and critical stress. The effect of changes in the rim thickness on the load sharing between the gears depended on the type of manufacturing error. Ring flexibility improved the load sharing between planetary gears only in systems with planet tooth thickness or planet tangential errors; for other types of error, ring flexibility worsened the load sharing. To improve load sharing, rim thickness and spline number should be controlled within a specific range. The minimum rim thickness limit should be determined considering not only the critical stress but also the load sharing. The effect of the ring gear boundary condition was more apparent in a system with errors than in a normal system.