• Title, Summary, Keyword: DOE

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Development of Simplified Building Energy Simulation Program for Building Energy Performance Analysis (건물에너지 성능 분석을 위한 간이 건물에너지 시뮬레이션 프로그램 개발에 관한 연구)

  • Park, Jong-Il;Kang, Yoon-Suk;Ihm, Pyeong-Chan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.21 no.1
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    • pp.9-15
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    • 2009
  • There are various types of energy simulation tool to predict both thermal load and energy use. However, the problem about these software is that they have too much input variables and need expert with skills to run the simulation. Therefore, the purpose of this study is to develop the thermal analysis simulation program with input variables which eliminates coordinates of building components instead of using full coordinates by using DOE2. Since the simulation engine of the program is DOE2, the validity of S-DOE is performed by comparing peak heating and cooling load results with VisualDOE and annual energy use results with actual energy use of 1996. The results have shown that there are little difference between VisualDOE and S-DOE. Also it showed that there are little difference between actual energy use and S-DOE energy use results. S-DOE took less time to model a building than VisualDOE. These results reveals that the application of S-DOE have potentials in accurately predicting both energy load and energy use of the building and still have an advantage of taking less time to model a building.

Studies on Curved Diffractive Optical Elements in EUV (극자외선 영역에서 곡면 DOEs에 관한 연구)

  • Choi, Sung-Eul;Lee, Yong-Woo;Kwon, Myung-Hoi;Kim, Yong-Hoo
    • Korean Journal of Optics and Photonics
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    • v.16 no.4
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    • pp.304-312
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    • 2005
  • Field performance of several different types of diffractive optical elements(DOEs) has been carried out. Using Zemax model, we have designed five different types of DOEs, such as transmissive flat-DOE, transmissive curved-DOE, reflective flat-DOE, reflective curved-DOE and parabolic mirror, We have applied two different wavelengths, i.e., 13 m(EUV) and 632.8 nm(visible) to above DOEs. Off_axis dominate aberrations and the diffraction limiting (Rayleigh limit) field angles have been investigated and compared at both wavelengths for each DOE. At diffraction limit, field angle of curved-DOEs was much greater than that of flat-DOEs for both transmission and reflective types. We also showed that dominated off_axis aberration of flat-DOEs was coma, but that of curved-DOEs was mixture of astigmatism and curvature of field. The measured field angle and expected OPD aberrations were well coincided with theoretical ones. Increasing the ratio of field angle with wavelength was more effective in curved-DOEs than flat-DOEs.

A Study on Development of Simplified Thermal Load Calculation Program for Building Energy Analysis (건물에너지 해석을 위한 간이열부하 해석프로그램 개발에 관한 연구)

  • Kang, Yoon-Suk;Um, Mi-Eun;Ihm, Pyeong-Chan;Park, Jong-Il
    • Proceedings of the SAREK Conference
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    • pp.72-77
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    • 2008
  • About 25% of overall energy use of Korea had been spent in buildings. It is crucial to acknowledge the importance of saving energy in buildings. In order to save energy, it is important to predict accurate energy use. There are numerous energy simulation program that predicts both energy load and energy use. The problem of the energy simulation program is that it holds too many input variables, and it needs experts to model a building. So, our purpose of this study is to develop the simplified thermal load calculation program for building energy analysis which eliminates coordinates of building components instead of using full coordinates by using DOE2. Since the engine of the program is DOE2, we verified the validity of S-DOE by comparing peak heating & cooling load results and annual energy use results. The results shows that there are little difference between VisualDOE and S-DOE. Also it showed that S-DOE took less time to input variables than VisualDOE. These results reveals that the application of S-DOE is possible to accurately predict energy load and energy use of the building and still have strong point that it takes less time to analyse building energy.

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The comparison and the Analysis of the optical performances between the single and the symmetrical double DOE lenses (단매와 대칭 2매로 구성된 DOE 렌즈의 광학성능 비교 및 분석)

  • 이환선;임천석;조재홍
    • Korean Journal of Optics and Photonics
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    • v.13 no.3
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    • pp.258-265
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    • 2002
  • In this paper, we design single and symmetrical double lenses with DOE. The specifications are the following : Image area is 4.8 mm $\times$ 3.6 mm, F/# is 2.8 and the overall length (from first lens surface to image plane) is 6.8mm. After comparing the optical performance and characteristic values, we determine that symmetrical double lenses are superior to single lenses. Symmetrical double lenses have the merits of fewer zones, weaker flare, and smaller distortion than single lenses.

DOE 렌즈 개발 현황과 전망

  • 김영준
    • The Optical Journal
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    • v.13 no.5
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    • pp.20-22
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    • 2001
  • 향후 초박형 렌즈에 있어서 플라스틱 DOE Lens가 주도적으로 사용될 전망이고, 광통신분야에서도 WDM(wavelenght Division Multiplexer)등에 응용 가능성이 높다. DOE Pattern의 회절광량 해석기술, DTM(Diamond Turning Machine)과 Laser가공기의 정밀도 향상 등으로 금형가공기술의 급속한 발전과 함께 DOE의 보편화는 조만간 이뤄질 것으로 보인다.

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Comparison of Hydrogen Crossover Current Density by Analysis Method of Linear Sweep Voltammetry(LSV) in Proton Exchange Membrane Fuel Cells (고분자전해질연료전지에서 선형주사전압전류측정법(LSV)의 분석방법에 따른 수소투과전류밀도 비교)

  • Oh, Sohyeong;Hwang, Byungchan;Lee, Mooseok;Lee, Donghoon;Park, Kwonpil
    • Korean Chemical Engineering Research
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    • v.56 no.2
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    • pp.151-155
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    • 2018
  • Degree of membrane degradation in Proton Exchange Membrane Fuel Cells (PEMFC) is mainly evaluated by the hydrogen crossover current density. The hydrogen crossover current density is measured by linear sweep voltammetry (LSV), which differs from the DOE protocol and the NEDO protocol. In this study, two protocols were compared during PEMFC operation and accelerated stress test. In the LSV method by the DOE method, the scan rate change affects the hydrogen crossover current density, but the NEDO method does not affect the hydrogen crossover current density. In the course of 15,000 cycles of polymer membrane wet/dry cycle, the DOE method was sensitive to membrane degradation, but the NEDO method was less sensitive to membrane degradation than the DOE method.

Reproduction Traits in the Korean Native Goat Doe

  • Song, H. B
    • Korean Journal of Animal Reproduction
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    • v.27 no.4
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    • pp.287-297
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    • 2003
  • The aim of this review is to give insight into the reproduction potential of the Korean native goat(KNG) doe. The mean age of the first estrus in the KNG doe is 141.24$\pm$18.l7 days. The length of the estrous cycle was recorded as being 20.58$\pm$2.63 days, with the mean duration of estrous period being 17.8$\pm$7.3 to 32.9$\pm$1.2 h, and the duration of the post-partum anestrous period being 13.4(9 to 18) to 30.1$\pm$3.8 days in the KNG doe. The ages at first delivery are 10 to 12 months(56.3%) in the KNG doe. The KNG does are no restricted breeding season, because estrus and kiddings are observed throughout the year. The mean gestation period of the KNG doe is recorded as being 150.69$\pm$6.14 days with parities having no significant effect on gestation length. The mean interval between parturitions in the KNG doe is 207.78$\pm$1.72 days with parities and birth type having no significant effect on kidding intervals. The mean litter sizes at birth in the KNG doe are 1.69$\pm$0.03 heads, and litter size at birth was affected (P<0.05) by parity. The mean birth weight of kid in the KNG is 2.04$\pm$0.30 kg with a variety as being 2.28$\pm$0.26, 2.11$\pm$ 0.30 and 1.64$\pm$0.19 kg for singles, twins and triplets over of birth type, respectively. The mean mortality of 635 kids in the KNG is 23$\pm$1 % with a variety as being 28$\pm$3, 21$\pm$2, 16$\pm$3 and 46$\pm$15 % for singles, twins, triplets and quadruplets of birth type, respectively.

Best Practices in Electronic Government : Comprehensive Electronic Information Dissemination for Science and Technology (전자정부 모범사례 : 과학기술정보의 포괄적 전자 유통)

  • Noh, Kyung-Ran
    • Journal of Information Management
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    • v.33 no.1
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    • pp.81-95
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    • 2002
  • The Department of Energy's (DOE) Scientific and Technical Information Program (STIP) has successfully reinvented the way in which DOE collects, organizes, archives, disseminates, and uses scientific and technical information in the performance of research and development (R&D). Through a suite of innovative Web-based products conceived and developed by the Department's Office of Scientific and Technical Information(OSTI), information and resources resulting from the Department's R&D activities, as well as worldwide information needed by the research community, are readily available to all users in a fully integrated E-Government environment. This suite of products is accessible publicly at .