• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.345-350
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• 2002

바이오테크놀로지(BT, biotechnology)는 21세기의 첨단과학기술로서 생명공학, 생물공학, 생물이용기술 등으로 불리우고 있으며(일농기학회, 2000), 이 중 실용화되고 있는 기술중의 하나가 식물조직의 배양기술이다(백, 1993), 현재 우리나라에서는 나리, 호접란 등의 우량묘 대량증식을 위하여 조직배양기술을 이용하고 있으나 배양공정의 대부분이 인력에 의존하고 있고 배양묘 생산에 소요되는 비용의 약 60% 정도가 노동비용에서 발생되고 있다(정, 1995). 따라서 배양묘 생산의 여러 과정 중에서 수작업에 의한 작업부분을 로봇 화하여 배양묘 생산비용을 절감하려는 연구개발이 활발히 수행되고 있으며, 이중 주목을 받고 있는 것은 배양기에서 증식된 소식물체의 적출, 절단, 이식과 같은 추후의 증식과정이다 이 공정은 노동집약적일 뿐만 아니라 공정의 수작업에 따른 절단의 불균일성, 품질저하, 조작의 미숙련성, 잡균오염의 위험성 등의 문제점이 로봇화로 해결 가능하기 때문이다. (중략)

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.6
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• pp.715-723
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• 2001

This paper is a proposal of the world-wide messaging system for supporting wireless internet messaging against the existing system which has many limits on functionality and structure. To this work, this paper proposes the hierarchical structure to ensure an extensibility of an existing messaging system, and show the possibility via implementing and operating together wireless units.

• Journal of the Korea Furniture Society
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• v.14 no.1
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• pp.11-20
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• 2003

Wood cell-wall modification with acetic anhydride, lumen filled with styren monomer and methyl methacrylate, and a combination of these two treatments were studied for their effectiveness for dimensional stability. Compared to those of untreated Pinus densiflora Sieb. et Zucc and sole acetylated red pine, The combination of acetylation and impregnation with methy methacrylate greatly reduced water absorption, increased ASE to the best and gave better bending strength and compression strength.

• Proceedings of the Safety Management and Science Conference
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• 2010.04a
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• pp.161-166
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• 2010

항공물류 분야의 개선을 위해 공항에서 연구와 투자를 통하여 공항 선진화를 이루고 있고, 우리나라도 지속적으로 증가하는 항공물류 분야의 개선이 필요하다고 인식하고 개선을 위한 방안을 연구하고 있지만, 항공물류 전반에 걸쳐 통합적인 개선이 이루어지지 않고 개별적이거나 부분적인 시스템 개선으로 중복 투자와 비효율성의 문제가 발생하고 있다. 본 논문에서는 이러한 문제점들을 해결하기 위해 현행 항공물류 프로세스를 수 출입으로 구분하여 분석하였고, 시스템 통합 사례들을 검토하여 프로세스 상에서 발생하는 문서들을 분석하였다. 이중 인터페이스 대상 문서를 선정하고 문서의 데이터 내용과 형식을 정의하였다. 정의한 데이터의 형식을 대상 문서에 코드로 적용시키고 시뮬레이션을 통하여 데이터 저장량을 비교 분석하였다. 이를 통해 항공물류 이해관계자간의 정보 교환이 용이해지고 동일한 정보를 재생성하거나 재가공하는 비효율성을 감소시킬 것으로 기대된다.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.43-48
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• 2001

본 연구에서는 컨테이너 터미널의 적정 안벽능력(Quay Capacity)을 분석하기 위한 시뮬레이션 모델을 구축하였다. 모델에서는 선박의 터미널 도착 특성, 선박별 양하량 및 적하량, 컨테이너 크레인(Container Crane, C/C) 생산성 및 투입대수 등을 입력변수로 입력하였으며, 시뮬레이션 결과로써는 안벽점유율, 선석 점유율, 대기시간 비율, 대기비율, Norm time 초과비율 등을 출력하였다. 이중 컨테이너 터미널의 평가지표로는 Norm time 초과비율, 대기비율 및 안벽점유율을 적용하였다. 컨테이너 터미널을 운영중인 터미널의 터미널 운영실적 자료를 이용하여 모델의 확인 및 검증을 실하였다. 모델은 Knowledge Base에 근거하여 수행되는 G2를 이용하여 구축하였다.

• Journal of the Korean Chemical Society
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• v.59 no.2
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• pp.117-124
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• 2015

The DFT and ab initio calculations have been performed to elucidate hydrogen interaction of hydrogen polyoxide dimers, $H_2O_n-H_2O_m$ (n=1-4, m=1-4). The optimized geometries, harmonic vibrational frequencies, and binding energies are predicted at various levels of theory. The harmonic vibrational frequencies of the molecules considered in this study show all real numbers implying true minima. The higher-order correlation effect were discussed to compare MP2 result with CCSD(T) single point energy. The binding energies were corrected for the zero-point vibrational energy (ZPVE) and basis set superposition errors (BSSE). The largest binding energy predicted at the CCSD(T)/cc-pVTZ level of theory is 8.18 kcal/mol for $H_2O_4-H_2O_3$ and the binding energy of water dimer is predicted to be 3.00 kcal/mol.

• Journal of the Korean Solar Energy Society
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• v.27 no.2
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• pp.111-119
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• 2007

The annual mean temperature of South Korea has risen by $1.3^{\circ}C$ for last 100 years by urbanization and industrialization. Especially, the frequency of unusual hot weather in summer increases for a long time and the frequency of unusual cold weather in winter clearly decreases. In recently, The considerable portion of curtain wall system is appled to building skin in domestic. As related to this, the Korea Institute of Construction Technology devised the box typed double skin facade(It is occasionally called as FDFS : Functional Double Facade System) as an alternative that reflects the distinctive local climate and saves cooling energy. Two mock-ups($49m^*4.9m$) applied to single skin(curtain wall) and double skin each were monitored under the outdoor condition. Therefore, the characteristics of natural ventilation and cooling energy consumption of each window had been analyzed in real time. The results of this study are summarized as follow, Analysis of the experiment on an air conditioner: the indoor temperature of the chamber with FDFS is lower than that of the chamber with single skin facades by $3{\sim}6$ degrees(C). A temperature variation of about $1{\sim}2$ degrees between the 0.2m and 1.7m height of the mock-up occurs in FDFS, while that of about maximum 7 degrees occurs in single skin facade at noon with abundant intensity of solar accident. Also, 67 percent of energy consumption for air conditioning has been saved.

• Journal of Satellite, Information and Communications
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• v.1 no.2
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• pp.89-94
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• 2006

ODFM(Orthogonal Frequency Division Multiplexing) technique is suitable for high speed data transfer both in wired/wireless channels, and is actively studied recently. Among them, WiBro based on IEEE 802.16 uses ODFM as its core technology, and is currently trying to expand market through commercialization. Therefore, if it's used for high speed moving object(KTX, airplane..etc) in near future, there is a possibility of ICI(inter-carrier interference) to occur due to DFS(Doppler Frequency Shift), a critical weak point of ODFM System. This study suggests 3 compensation techniques for Doppler effects in ODFM system operating through satellite, and confirms improved performance through constellation and BER curve.

• KIEAE Journal
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• v.6 no.1
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• pp.17-24
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• 2006

Daylight is a critical factor in architecture, as it enhances the working efficiency and visual comfort of the people working inside. Even though, low transmittance glazing has been used in the most office buildings in Korea. And it is reduced visual comfort in a indoor environment. So, we need to evaluation of quality for various daylighting systems to improve visual comfort This study aims to evaluate the visual comfort in a indoor environment by different daylighting system. For the purpose, four different daylighting systems-conventional window, conventional window with interior lightshelf, differentiated window, differentiated window with interior lightshelf-were selected and a questionnaire survey with 50 subjects were conducted. The results are as follows. Regardless daylighting systems, a view has an effect on visual comfort. A conventional system and conventional system with lightshelf were highly correlated between comfort and warmth. In case of differentiated window system were correlated between comfort and openness. Also, differentiated window with interior lightshelf were highly correlated between comfort and stability.

• Journal of the Korean Society of Tobacco Science
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• v.24 no.2
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• pp.107-112
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• 2002

There are many combination with the porosity of tipping paper and plug wrap for a design of ventilation rate of cigarette. This study was carried out to determine the effect of a design of permeability of tipping paper and inner or outer of plug wrap on the ventilation rate of cigarette with constant pressure drop in column part and filter part. Our results indicated that the higher the plugwrap porosity, the higher the ventilation rate and the less variable of cigarette in case of mono filter. But, in case of duel filter, the ventilation rate of cigarette was depended on the manufacturing method of filter plug, even though using the same porous plug wrap on inner and outer of filter. We also found that the porosity of outer plug wrap was more effect on the ventilation rate than the porosity of inner plug wrap. As the high porosity of inner plug wrap compared with the porosity of outer plug wrap, the less variable of ventilation rate of cigarette in any combination of the porosity of plug wrap. When we used the higher porous outer plug wrap than inner plug wrap, the ventilation rate of cigarette was high. Also, the higher the inner plug wrap porosity, the less variable of ventilation rate of cigarette.