• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1999.04a
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• pp.24-24
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• 1999

This study addresses the effectiveness of TEC(Thermoelectric cooler) application for spacecraft thermal control. The required radiator area and power consumption characteristics of active thermal control using TEC are compared with the passive control at BOL and EOL through unsteady thermal analyses by calculating external heat fluxes. When the component operating temperature is low enough in TEC active control, the required radiator area can be smaller than the passive thermal control. TEC also needs less power consumption than the passive control under the condition that the temperature of cooling pars is low enough and/or the design temperature margin of the components is narrow enough.

• Annual Conference of KIPS
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• 2011.04a
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• pp.279-282
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• 2011

인터넷의 급속한 보급으로 사용자가 정보와 지식의 접근이 용이 해진 반면, 방대한 정보의 과 부화로 인하여 데이터의 신뢰성이 문제시 되고 있다. 특히, 기존의 학술 연구와 관련된 논문 데이터 검색에 있어서, 사용자의 요구 사항에 정확히 부합하는 결과물을 제공하는 데는 많은 한계를 가진다. 본 연구는 기존의 단순 키워드 매칭 검색의 한계를 넘어서, 레퍼런스와 인용 논문을 활용한 내용 기반 검색 방법론을 제안 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.473-474
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• 2024

대표적인 분만 취약지 중 경상북도와 경상남도, 전라남도의 의료, 교육, 교통, 출산 지원 데이터를 분석하여 '육아가능인구'에게 유용한 정보를 제공하고 저출산과 지역별 육아 인프라 격차에 대한 긍정적인 해결책을 제안하는 것을 목표로 한다.

• Korean Journal of Soil Science and Fertilizer
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• v.14 no.3
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• pp.117-129
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• 1981

An experiment with the tobacco plant was conducted in the pots. A sandy humic soil was used with 2 levels of pH, 3.5 and 5.8 with 2 kinds of anions, Cl as $NH_4Cl$ and $SO_4$ as $(NH_4)_2SO_4$, and with 4 levels of pF, 1.5, 2.0, 2.5, and 3.5. The pH-treatment created different N-forms; $NH_4$ at low pH(3.5) and $NO_3$ at high pH (5.8). The results are summarized as follows: 1. At low pH (3.5) with high concentration of $NH_4$ given as $NH_4Cl$, the high content of $NH_4$ and Cl in tobacco resulted in plants suffering from $NH_4$ and Cl toxicity as well as Mn toxicity. As a result of these toxicity, an extremly abnormal growth of tobacco was clearly appeared. In the tobacco grown at low pH with $NH_4$ given as $(NH_4)_2SO_4$, a large amount of the $NH_4$ uptake developed Mg and Ca deficiencies. $NH_4-N$, which had been applied to the soil of high pH (5.8), was almost completely transformed into $NO_3-N$ by nitrification and, on this low acidic soil, the plants were all healthy regardless of Cl or $SO_4$ added together with $NH_4-N$. However, dry matter production was higher and maturity faster when $SO_4$ was used as anion than when Cl was used. 2. High moisture content in soil, to some extent, is necessary for a good development and growth of the tobacco plant. Phosphate uptake seemed to be limited at higher moisture stress. The dry matter yield of tops and roots of tobacco were in the order of pF 1.8 > 2.1 > 2.6 > 3.6, respectively. 3. Data of chemical analysis and dry matter yields of tops and roots showed that the tobacco plant followed the normal (C-A) concept. In the normal growth of plants, the carboxylate content of tops was quite comparable to the estimated (C-A) values. If $NH_4$ content of plants remains in quite high quantities, it must be analysed and taken into consideration for the (C-A) calculation. Al is not transported toward tops in toxic amounts due to its high immobility, it mostly stay in or on the roots, probably due to precipitation as a aolt. When Al is present in high quantities, it has to be considered into the (C-A) calculation.

• Transactions of Materials Processing
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• v.22 no.5
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• pp.250-257
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• 2013

A series of finite element analyses of the rolling process were performed and a neural network algorithm was employed to calculate the amount of ski-effect for an arbitrary thickness of incoming material in the roll gap. Pilot hot plate rolling tests were also conducted to verify the usefulness of the finite element analyzes conducted in this study. In these experiments, plates with thicknesses varying from 25 to 65 mm were tested. In addition, a number of rolling reductions of up to 31% were examined. Finally, a number of circumferential upper and lower rolls were investigated. Experimental validations demonstrated that the neural network algorithm predicted the proper amount of ski when rolling conditions(material thickness, reduction ratio, roll velocity differential) changed arbitrarily.

• The Journal of Internal Korean Medicine
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• v.35 no.4
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• pp.448-454
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• 2014

Objectives: The aim of this study was to analyze the change of lateral shift of Center of Pressure (CoP) according to the gait improvement in post-stroke hemiplegic patients and to investigate relationship between the change of motor grade and lateral shift of CoP. Methods: We measured the lateral shift of CoP and motor grade of eight post-stroke hemiplegic patients at the beginning of dependent gait and independent gait. Results: We found that CoP tended to be shifted to the non-affected side when patients started to walk independently. Furthermore, there was no relationship between the change of motor grade and lateral shift of CoP. Conclusions: This result may suggest it is more important to control the non-affected side than the affected side, at least until the beginning independent gait.

• The Journal of Internal Korean Medicine
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• v.35 no.4
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• pp.498-504
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• 2014

Objectives: This study investigated the change of foot rotation angle of gait analysis parameters according to gait improvement in post-stroke hemiplegic patients. Methods: We measured the foot rotation angle of eight post-stroke hemiplegic patients at the time of dependent and independent gait. Results: The foot rotation angle of the paralyzed side reduced closer to normal average according to gait improvement, but the non-paralyzed side not significantly. Conclusions: Improvement of foot rotation is an important thing for independent gait of post-stroke hemiplegic patients so this treatment seems worthy of being considered in clinical trials.

• Bulletin of the Society of Naval Architects of Korea
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• v.5 no.1
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• pp.1-7
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• 1968

In this problem the ragid punch in the form of a flat-ended circular cylinder of unit radius is cemented to the stress free surface of an elastic half-space. An axial load P is then applied to the punch to force it into half-space to depth $\varepsilon$. It is assumed that the adhesive between the punch and can be reduced to the system of Abel type integral equations which are equation (13) and (14). It is also shown that the stress and displacement components on the portions of boundary where they are not prescribed can be expressed in terms of $\phi(t)$ and/or $\phi(t)$ which are introduced in equation (9) and (10). Those functions can be obtained from the solution of the system of integral equations (13) and (14).

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.04a
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• pp.62-66
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• 1999

야생화를 도시환경 조성에 이용하고저 대량 육묘기술 중 알맞는 관수방법과 양액을 구명하기 위하여 꽃향유를 공시하여 시험한 결과 다음과 같았다. 1 2개월 육묘시 저면 양액 담배수 관수 방법이 지상 관수에 비해 10배나 높은 생장량을 보였다(지상관수 자료는 Data에는 보이지 않음). 2. 뿌리발달로 보아 저면 양액 관수방법은 2개월 육묘로도 가능하였지만 지상 관수는 3개월 육묘해야 화단에 정식 할수 있을 것으로 보였다. 3. 2개월 육묘 저면 양액 관수시 양액농도는 1/2S의 Sonneveld 기준액이 가장 좋았고 N, K 는 약간 늘려주는 것이 좋았다. 4. 식물체내 무기물 성분은 저면 양액 관수가 높았고 생장량이 많았던 구가 비교적 높았다. 5. 화단에 정식시켜 개화기의 관상가치는 지상관수나 저면 양액 관수가 별 차이를 보이지 않아 흡비력이 높은 이 야생화는 육묘시는 다소 생장이 떨어져도 화단에서는 대체로 같아졌다. 6. 개화기의 초장도 3/2S와 Hyponex구에서 가장 컸으나 초장은 너무 커서 재배적으로 좀 줄여줘야 더 좋을 것으로 보여 S나 1/2S도 좋을 것으로 생각되었다.

• Korean Journal of Remote Sensing
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• v.33 no.6_3
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• pp.1171-1177
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• 2017

This special issue introduces recent researches on KOMPSAT(KOrea Multi-Purpose SATellite) image processing and applications. In this paper, the status of KOMPSAT development and national satellite image application policy are introduced and the implications of the papers presented in the special issue are discussed. Satellite image resources and application policy that can be utilized through continuous satellite development are considered to be systematically prepared. Therefore, if data processing and application technology development for various fields such as forest and urban change detection, image correction technology introduced in this paper are continuously carried out, it is expected that the competitiveness of national satellite image will be further strengthened.