라오스의 벼 생산 현황과 문제점

이문희,최경진,이정일,정남진,양원하,김제규 한국국제농업개발학회 2001 韓國國際農業開發學會誌 Vol.13 No.4

Rice is the single most important crop in Lao PDR. In the 2000 rice production year, total rice production in the Laos reached 2.2 million tons. This is regarded as sufficient to provide national self-sufficiency. The rice harvested area in 2000 was approximately 719,500ha and represented 80% of cropped land area. Approximately 82% of production was from wet season cropped and 18% was from the irrigated dry season. Grain yield per unit area vary from 1.68 to 4.39 ton/ha in the wet season environment. However, the highest grain yield (4.39 ton/ha) obtained from the dry season irrigated crop. Higher yields and reduced year variation in production can be expected with the further intensification of production systems in the low land environments. However, further imporvements in production will be dependent on higher levels of inputs and further alleviation of some the production constraints.

성인 Ⅲ급 부정교합자의 SELLA TURCICA의 형태 및 크기에 관한 연구 : The Possibility of Sella Turcica as Class Ⅲ Growth Prediction Indicator SELLA TURCICA 부피의 Ⅲ급 부정교합 예측 지표로서의 가능성

양원식,하태헌 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.2

Sella는 오랜 동안 교정학에 있어 필수적인 landmark로서 중요한 위치를 차지해 왔다. 그러나 sella turcica는 그 안에 성장호르몬을 비롯한 많은 중요 호르몬을 분비하는 뇌하수체를 함유하고 있는 구조물로서 sella turcica의 크기는 뇌하수체의 크기를 비교적 정확히 반영한다고 알려져 있다. 따라서 뇌하수체의 크기가 그 기능이 서로 비례한다면 두부방사선 사진에서 관찰되는 sella turcica의 크기와 성장호르몬을 비롯한 여러 뇌하수체 호르몬의 분비 차이에 의한 악골부조화와 이로 인한 Ⅲ급 부정교합과의 상관관계도 의심해 볼 수 있다. 따라서 본 연구에서는 50명의 정상교합자 남녀와 50명의 Ⅲ급 부정교합자 남녀를 대상으로 하여 측모 두부방사선사진과 전후방 두부방사선 사진에서 관찰되는 sella turcica의 부피를 구하고 두부방사선 분석을 통해 Ⅲ급 부정교합간의 상관관계를 구하였다. 연구결과 정상교합군보다 Ⅲ급 부정교합군에서 sella turcica의 부피가 유의하게 큰 것으로 나타났으며 (p<0.001), Ⅲ급 부정교합군에서 여성이 남성보다 더 큰 sella turcica 부피를 갖는 것으로 나타났다(P<0.05). 또한 Ⅲ급 부정교합을 반영하는 APDI, ANB, effective mandibular length등의항목에서 sella turcica 부피와 높은 상관관계를 나타냈고 전두개저 길이에 대한 sella turcica 부피의 비를 표시하는 Sella Index는 sella turcica부피자체보다 Ⅲ급 부정교합을 더 정확히 반영하였다. 따라서 악안면 발육에 대한 성장호르몬의 효과나 sella turcica 부피와 뇌하수체 호르몬 분비량과의 관계에 대한 지속적인 연구, sella turcica 부피에 따른 악안면 성장에 대한 장기적인 연구를 바탕으로 Sella Index를 Ⅲ급 부정교합을 예측하는 지표로서 활용할 수 있을 것이다. Sella turcica contains pituitary gland that has influence on craniofacial growth. So, if the volume of sella turcica correlate to the function of pituitary gland, we can assume that the volume of sella turcica in skeletal Class Ⅲ patients has some difference to that of normal occlusion group. The purpose of this study was to evaluate the difference of shape and volume of sella turcica between normal occlusion group and Class Ⅲ patients. The shape of sella turcica was Classified by Inaba method and the volume of sella turcica was measured in lateral and P-A cephalograms by Di Chiro method. To find out the possibility of the volume of sella turcica as diagnostic aid to predict Class Ⅲ growth pattern, the correlation coefficients between the volume of sella and cephalometric variables were calculated. The results were as follows. 1. The volume of sella turcica in Class Ⅲ patients is larger than that of normal occlusion groups 2. The volume of sella turcica in female was larger than that of male in Class Ⅲ patients 3. The volume of sella turcica has close correlation with APDI, ANB, SNA, SNB, ODI, gonial angle, post. cranial base length 4. Sella Index(vloume of sella/ ant. cranial base length) can be a more accurate indicator that represent Class Ⅲ growth pattern that volume of sella itself. 5. The morphologic pattern of sella turcica had no significant difference between two groups.

비점막(鼻粘膜) 섬유세포에서의 RANTES와 MCP의 발현 조절

하용찬,조정재,유영처,양원용 Official Journal of the Korean society for immunol 2003 Immune Network Vol.3 No.1

만성신부전증 환자의 HLA 동종항체 분석

김대원,양윤선,김선희,오하영 대한임상병리학회 1997 대한임상병리학회지 Vol.17 No.1

수소화된 비정질 규소에서 바이어스에 의한 실리사이드 형성

梁承勳,金鐵河,李原鎭 慶北大學校 1990 論文集 Vol.49 No.-

We show that biased annealing of a-Si:H contacted with metal gives rise to silicide growth and the creation of metastable states that can be to some extent removed by unbiased annealing. This paper gives the first report of a direct correlation of Ⅰ-Ⅴ characteristics to silicide growth in a-Si: H. Variations of Ⅰ-Ⅴ characteristics with annealing biases are analysed by the two series-connected diodes model.

軸의 Keyway 附近에서의 應力集中現狀에 관한 硏究

양원호,이정하 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2

The fatigue strength is decreased by stress concentration in the curvature part of a keyway. Thus, the stress concentration phenomena near the kewway of a shaft have been treated as an important issue. The objective of this thesis is to analyze stress concentration phenomena numerically by means of 3-Dimensional Finite Element Method and to examine fracture form near the keyway of a shaft by a torsional fatigue testing. Stress concentration phenomena have been studied for various width, depth, and sled radius of the sled runner type key way of the shaft which is subjected to torsional moment. Torsional fatigue tests were carried out using PMMA bar specimen to examine the initiation and the form of fracture. The following results were obtained. 1.. The maximum principal stress was appeared near the end corner portion of a sled part and the direction of the maximum principal stress was 45 degree with the axis of the shaft. 2. As the depth of the keyway is being increased, the stress concentration coefficient for the maximum principal stress which appeared sled part is increased. And as the width of the keyway or the radius of the sled is being increased, stress concentration coefficient is decreased. 3. The fracture of a low ductile shaft occurs at the point where the distortion energy density is greatest and the direction of fracture is 45 degree with the axis of the shaft by means of principal stresses. The fracture of a high ductile shaft occurs, however, in the dirction of 90 degree with the axis of the shaft by means of the maximum shear stress at the parallel portion of the keyway.

방음터널 단면형상에 따른 소음저감 특성 평가 : 터널 내부소음을 중심으로

이원열,김하근,오양기,주문기 대한건축학회 2004 대한건축학회논문집 Vol.20 No.2

It seems inevitable for residential buildings to be high-rise and allocated near traffic roads due to the crowdedness in urban areas. Acoustic environments in those areas have been seriously deteriorated by the increase of traffic vehicles. But sound barriers have a limitation in controlling noise due to diffraction noise from sound barriers. Hence sound barrier is not effective to protect the high-rise apartment from traffic noise. This work aims at evaluating characteristics of noise reduction according to the tunnel section shapes by using 1/5 scale model. We carried out a number of field measurements for 1/5 scale model of noise barrier tunnels with various sectional shapes. The results were as follows 1) The level difference was ranged from 0㏈ to 1.2㏈ according to the opening in the ceiling 2) The level difference was ranged from 0.4㏈ to 2.3㏈ when sound-absorbing materials were increased up to 45% of all surface areas. 3) There was generally good agreement between prediction results and the measurement results.

유한요소법에 의한 콘크리트의 파괴진행해석

송하원,변근주,양재성 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.2

Fracture machines does work for concrete, provided that one uses a proper, nonlinear form of fracture mechanics in which a finite nonlinear zone at fracture front is being considered. The fracture process zone is a region ahead of a traction-free crack, in which two major mechanisms, microcraking and bridging, play important rules. The development of model of fracture process zone is most important to describe fracture phenomena in concrete. The toughness due to bridging is dominant compared to the toughness induced by the microcracking, so that the bridging is the dominant mechanism governing the fracture process of concrete. In this paper the bridging zone, which is a part of extended macrocrack with stresses transmitted by aggregates in concrete, is modelled by a Dugdale-Barenblatt type model with linear tension-softening curve. Finite element techniques are shown for implementation of the model for the analyses of crack growth in concrete.

방음터널 단면형상에 따른 소음저감 예측 및 특성 평가 : 터널 외부소음을 중심으로

오양기,김하근,이원열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.8

Noise emitted from urban arterial roads is getting more serious problem in the environmental quality of living. Though noise barrier is one of measures to mitigate noise levels at housing area, it has a limited effect especially on apartment units high around the roads. Noise barrier tunnel may be another effective device for noise reduction even to high rise apartments. On these basis, this study aims at providing a number of possible sectional shapes of noise barrier tunnels, measuring their effects on noise reduction with 1 to 5 scale model measurements, and proposing/validating a prediction technique of their effects. According to a number of measurements with various sectional shapes or the scaled model, 1)the proposed sectional shapes have affirmative effects on noise reduction, 2)the difference in noise levels between in and out of tunnel are about 10dB whether there is opening in the ceiling or not. 3)results from predictions and the measurements show generally good agreements within 0.3∼3.6 dB(A).

국내 종합병원 병동부의 리모델링 수행전략에 관한 연구

김하진,양내원 대한건축학회 2003 대한건축학회논문집 Vol.19 No.3

As hospitals change continuously and rapidly, the way of growth and change becomes another important factor in the design of a hospital. The hospitals are also adapted for the continuous growth and change during their life span, because of the requirement of the hospital that changes endlessly, and develops continuously. But the ward areas built in 1970's and 80's have been expanded and reconstructed without reasonable plan of growth and change. So, there is required to the architectural planning on the remodeling strategy of the ward areas. The purpose of this study is to provide the fundamental data for the reasonable design planning and the basic principles of the construction plan in the ward remodeling. So, this study is to investigate and analyze the characteristics of the ward remodeling, the remodeling planning, and the scheduling process in terms of construction. As a result, this study would apply to design strategy for the ward remodeling of general hospitals.