• 대한수학회보
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• 제39권3호
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• pp.479-484
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• 2002

Let I be an ideal in a Gorenstein local ring A with the maximal ideal m and d = dim A. Then we say that I is a good ideal in A, if I contains a reduction $Q=(a_1,a_2,...,a_d)$ generated by d elements in A and $G(I)=\bigoplus_{n\geq0}I^n/I^{n+1}$ of I is a Gorenstein ring with a(G(I)) = 1-d, where a(G(I)) denotes the a-invariant of G(I). Let S = A[Q/a$_1$] and P = mS. In this paper, we show that the following conditions are equivalent. (1) $I^2$ = QI and I = Q:I. (2) $I^2S$ = $a_1$IS and IS = $a_1$S：sIS. (3) $I^2$Sp = $a_1$ISp and ISp = $a_1$Sp ：sp ISp. We denote by $X_A(Q)$ the set of good ideals I in $X_A(Q)$ such that I contains Q as a reduction. As a Corollary of this result, we show that $I\inX_A(Q)\Leftrightarrow\IS_P\inX_{SP}(Qp)$.

• 한국농공학회지
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• 제21권1호
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• pp.78-85
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• 1979

In order to obtain the basic data for designing optimum flat plate solar air heaters, which can be operated with relatively low temperature for drying farm products, 8 different treatment of solar air heaters were devised and tested for their heating performances and efficiencies. The results were analised and summarized as follows. 1. The primary factors, structure of air path (C), black coating materials (A) and bottom coating methods (B) showed very high significant effect of far above 1% level. With respect to the mutual multiplying effect of secondary factors, 1% level of significance was found with coating materials and methods (AB), and 5% level of significance was found with coating materials and air path structure (AC). 2. The heating performance of the air heaters with winding air path showed about twice those with straight air path. 3. The Korean black ink which is less expensive than dim oil paint showed 3-4% better heating efficiencies as the black coating material of flat plate solar air heaters. 4. The heating efficiencies of the solar air heaters whose bottoms were not black coated were 2-3% higher than those with black coated bottoms. 5. The highest heating efficiency of solar air heater among 8 different treatment was found in the plot of Korean black ink-bottom not coated-winding air path showing 29.0-34.5%

• 조명전기설비학회논문지
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• 제21권1호
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• pp.1-9
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• 2007

본 연구는 실내로 유입되는 주광을 조광제어시스템의 적용에 효율적으로 활용하여 초과한 인공조명의 광량을 줄임으로써 에너지 절약의 효과를 높이고자 함이다. 광센서는 탐지된 광속량을 신호로 보내고 그에 알맞은 제어신호를 받아 조광율을 결정하는데, 일반적으로 사무공간에서 인공조명의 개수나 행수만큼 광센서가 설치가 되어 조명기구의 각 구역마다 다른 조광율로 조광제어를 하는 것이 인공조명 제어측면에서는 효율적이나, 시스템 설치비용측면에서는 비효율적이다. 그러므로 실험과 시뮬레이션을 통하여 미리 유입되는 주광 분포를 파악하고 조광율을 분석한다면, 하나의 광센서 설치로써 인공조명 구역간의 각기 다른 조광율로 제어가능하다.

• 조명전기설비학회논문지
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• 제22권2호
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• pp.1-9
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• 2008

빛은 인간이 주거공간에서 삶을 영위함과 더불어 창조활동을 하는데 있어서 가장 중요한 요소이다. 특히 식탁조명설계는 인간에게 신체적 심리적으로 가장 중요한 요소로 작용함에도 불구하고 현재까지 미적인 면만을 강조하였다. 그 이유는 조명디자이너가 KS기준조도에 맞추어 조명설계를 하고 있는데, KS기준조도는 한국의 사회 문화적 특성을 고려하지 않은 일본의 기준조도(JIS)를 기본으로 만들어진 것이므로 적절치 못한 조도레벨인 것이다. 따라서 한국의 특성이 반영된 기준조도 설정이 매우 시급한 상황이다. 본 연구에서는 현재 공동주택에 적용되고 있는 조명설계 현황을 조사하고 분석하여 한국의 식문화에 적절한 조도레벨, 색온도, 조명디자인을 제안하여 조명설계시 가이드라인으로 활용하고자 한다.

• 대한기계학회논문집A
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• 제25권11호
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• pp.1785-1795
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• 2001

A multi-layered brick element fur the finite element method is developed for analyzing the three-dim-ensionally layered composite structures subjected to both thermal and mechanical boundary conditions. The element has eight nodes with one degree of freedom for the temperature and three for the display-ements at each node, and can contain arbitrary number of layers with different material properties with-in the element; the conventional element should contain one material within an element. Thus the total number of nodes and elements, which are needed to analyze the multi-layered composite structures, can be tremendously reduced. In solving the global equation, a partitioning technique is used to obtain the temperature and the displacements which are caused by both the mechanical boundary conditions and temperature distributions. The results by using the developed element are compared wish the commercial package, ANSYS and the conventional finite element methods, and they are in good agreement. It is also shown that the Number of nodes and elements can be tremendously reduced using the element without losing the numerical accuracies.

• Fisheries and Aquatic Sciences
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• 제12권4호
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• pp.265-275
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• 2009

G Protein-coupled receptors (GPCRs) mediating wide ranges of physiological responses is one of the most attractive targets for drug development. Rhodopsin, a dim-light photoreceptor, has been extensively used as a model system for structural and functional study of GPCRs. Fish have rhodopsin finely-tuned to their habitats where the intensity and the wavelength of lights are changed depending on its water-depth. To study the detailed molecular characteristics of GPCR architecture and to understand the fishery light-sensing system, genes encoding rod opsins were isolated from fishes living under different photic environments. Full-length rod opsin genes were obtained by combination of PCR amplification and DNA walking strategy of genomic DNA isolated from olive flounder, P. olivaceus, Japanese eel, A. japonica, and Common carp C. carpio. Deduced amino acid sequences showed a typical feature of rod opsins including the sites for Schiffs base formation (Lys296) and its counter ion (Glu113), disulfide formation (Cys110 and Cys187), and palmitoylation (Cys322 and Cys323) although Cys322 is replaced by Phe in Japanese eel. Comparison of opsins by amino acid sequence alignment indicated the closest similarity between P. olivaceus and H. hippoglossus (94%), A. japonica and A. anguilla (98%), and C. carpio and C. auratus (95%), respectively.

• 한국동물학회지
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• 제3권1호
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• pp.1-4
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• 1960

The test group and control group, which were grouped with the same weight of five frogs (Rana nigromaculata) respectively, were adapted to light for two hours. Then the anterior lymph heart of the test group were injected with 0.5 cc of 0.1% acetyl choline and 0.5cc of Vitamin B12 (50mc gm/cc). After the frogs of this group were dark-adapted for 90 minutes, their heads were cut off under the dim red light and then their retina removed from eye-balls were extracted with 2% digitonin solution for 20 hours at $0^{\circ}C$. The results of the comparison of these two groups whose optical densities were measured before and after the illumination areas follows : (1) The group which had been injected with 0.5cc of 0.1% acetyl choline solution had the protomotive action on the regeneration of rhodopsin in comparison with the control group. (2) The group which had been injected with 25 mc gm of Vitamin B12 and 0.5cc of 0.1% acetyl choline solution had the controlling action on the regeneration of rhodopsin in comparison with the control group.

• 한국양식학회지
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• 제7권1호
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• pp.1-7
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• 1994

긴잎돌김 (Porphyra pscudolineris Ueda)의 엽상체와 배양 사상체에 미치는 온도와 광도의 영향을 구명하였다. 엽상체와 사상체의 총 광합성의 적정 온도는 각각 $25\~30^{\circ}C$, $20^{\circ}C$로 나타났다. 엽상체와 사상체에서 광도에 따른 광합성율은 공히 10,000 lux 이상에서 광합성율이 일정한 값에 도달하는 광포화 곡선을 나타내었다. 엽상체의 광 보상점은 2,100 lux, 사상체의 광 보강점은 900 lux였으며, 사상체의 광합성능은 엽상체의 5-10배에 해당하였다. 이로써 사상체는 낮은 광도하에서도 광합성을 수행할 수 있음을 알 수 있다.

• Asian-Australasian Journal of Animal Sciences
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• 제9권5호
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• pp.503-508
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• 1996

The data analysed consisted of records on lactation length (LL), total lactation yield (TLY), estimated 305-day yield (305 DY), days dry (DDRY), age at frist calving (AFC) and calving interval (CI) of 448 Friesian $\times$ Bunaji halfbreds that calved over a twenty-three year period (1967-1989) at the National Animal Production Research Institute, Shika, Nigeria. Least squares means of LL, TLY, 305DY, DDRY, AFC and CI were 250 days, 1,988 kg, 2,420 kg, 102 days, 35 months and 390 days, respectively. Parity, season and year of calving significantly affected LL, TLY (p < 0.01) and 350DY (p < 0.05), but not CI. DDRY was affected by season of calving only (p < 0.05). It was therefore concluded that the Shika Friesian $\times$ Bunaji crossbreeding programme was successful and beneficial in that the $F_1$ crosses calved at a younger age, produced twice as much milk, had longer lactations and slightly shorter calving intervals than the indigenous Bunaji.

• 한국정보통신학회논문지
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• 제5권5호
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• pp.1025-1030
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• 2001

3D stabilizing system구현 전 단계로서, 본 논문에서는 vehicle의 운동 중에도 지정된 방향을 유지하는 2D stabilizing system을 제작하였다. 본 system을 controller로서 DSP TMS320F240을, rate gyroscope로서 vibratory rate gyro(Tokimec co. TFG -l60D), direct drive driver/motor로서 SD1015B52-1·SD1004C04-l/DM1015B·DM1004C, control algorithm로서 PI control을 이용 system을 구현하여 rate gyro를 이용, 발생 error를 보상하도록 하여 비교적 나은 안정화 결과를 얻었다.