• 수산해양기술연구
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• 제32권3호
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• pp.257-265
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• 1996

The combined hydroacoustic and bottom trawl surveys were conducted in the Cheju southeastern area by the training ship "KAYA" belong to Pukyong National University in July 1995 and the traning ship "NAGASAKI MARl]" belong to Nagasaki University in April 1994, respectively. The main purpose of the investigations was to provide the basic data for the management and the biomass estimation of commercially important demersal fish stocks in this area. Fish samples were collected by bottom trawling from 10 trawl stations randomly selected in the survey area, and the species and length compositions of trawl catches were examined. The fish school target strength for demersal fish aggregations was related to the catchability of trawl net with a 90 mm mesh codend. The most abundant species in the 1995 trawl stations were Japanese flying squid, sword tip squid and red horsehead and that of the 1994 trawl stations Japanese flying squid and blackmouth goosefish. The average weight per cubic meter of trawl catches collected by bottom trawling in the Cheju southeastern area were $1.0791{\times}lO^-4$kg/$m^3$ in the 1994 survey area and $1.3636{\times}lO^-4$kg/$m^3$ in the 1995 survey area, respectively. The catch data by cover net suggest that the efficiency of trawl net could affect the weight normalized target strength values for demersal fish aggregations. That is, the average target strength per unit of weight dropped from - 33.1 dB/kg using the total catch by codend and cover net to - 30.5 dB/kg using only the catch data by codend, and a change of2.6 dB/kg was observed.ange of2.6 dB/kg was observed.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.220-220
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• 2012

The supercapacitors with extraordinarily high capability for energy storage are attracting growing attention for their potential applications in portable electronic equipments, hybrid vehicles, cellular devices, and so on. The nanostructuring of the electrode surface can provide large surface area and consequently easy diffusion of ions in the capacitors. In addition, compared to two-dimensional nanostructures, the three-dimensional (3D) nano-architecture is expected to lead to significant enhancement of mechanical and electrical properties such as capacitance per unit area of the electrode. Polyaniline (PANi) is known as promising electrode material for supercapacitors due to its desirable properties such as high electro activity, high doping level and environmental stability. In this context, we fabricated well-ordered 3D PANi nanostructures on 3D polystyrene (PS) nanospheres which was arrayed by layer-by-layer stacking method. The height of the PANi nanostructures could be controlled by the number of PS layers stacked. 3D PANi hollow nanospheres were also fabricated by dissolving inner PS nanospheres, which resulted in further enhancement of the surface area and capacitance of the electrode.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.419-422
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• 2004

This paper was carried out desertification area change detection from 1980s to 2000s per unit decade using by multitemporal satellite images (Landsat MSS, TM, ETM+). This study aims to use Spectral Mixture Analysis (SMA) to identify and classify study area. Endmembers is selected bare soil, green vegetation (GV), water body using by Minimum Noise Fraction (MNF). Endmembers used to generate increase and decrease images respective from 1980s to 1990s and from 1990s to 2000s. From the analysis of multitemporal change detection for three periods, it was apparent that the area of bare soil increased significantly, with simultaneous decrease of GV and water body. The multitemporal fraction images can be effectively used for change detection. Though there is no field survey dataset, SMA is reliable result of change detection in desertification in China.

• 반도체디스플레이기술학회지
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• 제16권1호
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• pp.102-105
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• 2017

Currently, the size of the electronic device is in the nano area. In order to control the movements of these nanoscale devices, one should be able to understand the physical phenomena in the nano area. Recently, due to carbon nanotubes and mechanical outstanding electrical conductivity and mechanical characteristics of the carbon nanotubes and Graphene behaves to apply. Efforts have been active. There are various tubes with a radius of a in a compact mass in the form of a Multi walled carbon nanotubes in different between the radius. Van der Waals force can move smoothly without friction with each other by the nanoscale motor turning, using the properties, making. This is the lightest solids per unit area on the thickness is electrical atomic layer one of the substance and the electrical conductivity, the best material and mechanical characteristics are very much. Many studies because great is the ideal nanoelectromechanical device of material is being considered. In this study, electrical resonator for a new structure proposed and the nature and methodology would like to come up.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2010-2012
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• 2005

Activated carbon was activated with chemical treatment to attain high surface area with porous structure. We have been considered activated carbon is the ideal material for high voltage electric double layer capacitor due to their high specific surface area, good conductivity and chemical stability. In this study we found that increase in electrochemical capacitance due to activated carbon. Also chemically activated carbon and water treatment have resulted larger capacitance and also exhibits better electrochemical behavior, and is about 15% more than in untreated state. The structural change in activated carbon through chemical treatment activation was investigated by using SEM and XRD. In this study, the dependence of the activation behavior with KOH in the micro structure of host materials will be discussed. Furthermore, the relation to the electric double layer capacitance, especially the specific capacitance per unit area, is also discussed.

• 한국컴퓨터정보학회논문지
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• 제13권3호
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• pp.85-90
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• 2008

본 논문에서는 가장 덜 복잡한 공간부터 청소하는 공간 효율적인 새로운 로봇 청소 알고리즘인 SetClean 알고리즘을 제안한다. 청소 완료 시간이 길어지거나, 예측하기 어려운 경우에는 전체 청소 완료시간을 최적화하기보다는 가능한 빠른 시간에 가장 넓은 공간을 최대한 청소하는 것이 유리한 경우가 있다. 이를 위해 SetClean 알고리즘에서는 전체 공간을 셋 커버 알고리즘을 이용하여 청소 가능한 공간으로 구분하고, 단위 시간 당 청소 효율이 가장 높은 공간부터 청소를 진행하게 된다. SetClean 알고리즘은 해당 청소 가능 구역의 면적뿐만 아니라 로봇의 현재위치로부터 해당 청소 구역까지의 이동 거리, 청소 구역 내에서의 로봇의 회전으로 인한 지연 시간 등을 고려하여 최적의 청소 순서를 결정한다. 실험을 통해 SetClean 알고리즘의 동작 과정 및 성능을 보여준다.

• 한국작물학회지
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• 제33권1호
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• pp.12-22
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• 1988

토양 및 양액의 pH와 질소시용량이 대맥 품종의 생육과 수량에 미치는 영향에 대한 시험결과를 요약하면 다음과 같다. 1. 양액의 PH가 유묘의 생장에 미치는 영향은 현저하지 않았다. 2. 양액중에 0.6 mM의 Al 처리에 의하여 유묘의 근 및 지상부 생육이 현저히 억제되었는데 두산1002는 거의 생장저해현상이 발생하지 않아 Al에 내성품종으로 나타났다. 3. 엽중의 엽록소함량은 토양 pH의 저하에 따라 감소하였고 질소증가에 따라 엽록소 및 질소함량은 증가하였다. 4. 출수기는 토양 pH의 증가에 따라 1~2일 빨라졌으며 질소증가에 따른 출수기의 변화는 현저하지 않았고 품종에 따라 일정한 경향이 없었다. 5. 간장은 토양 pH의 저하에 따라 현저히 감소하였고 질소증시효과는 현저하지 않았다. 6. 지상부 건물중은 품종에 따라 차이가 있으나 대체로 토양 pH의 감소에 의하여 감소하였고 질소증시에 따라 증가하였다. 7. m$^2$당 수수는 토양 pH가 낮을 때 감소하였는데 그 정도는 새올보리에서 작은 편이었고 질소증시효과는 품종에 따라 다르게 나타났다. 8. 수당립수는 질소증시효과가 별로 나타나지 않았고 pH의 효과는 새올보리, 팔달보리, 강보리 등에서 토양 PH가 낮을수록 감소되었다. 9. 1.000립중은 pH 4.5 수준에서 현저히 감소되었고 질소증시효과는 현저하지 않았다. 10. 수량은 토양 pH가 낮을 때 현저히 감수되었고 생육기의 토양 pH는 모든 공시품종에서 수량과 고도의 유의한 상관을 나타내었으나 질소증시효과는 현저하지 않았으며 토양 pH에 따른 수량의 안정성은 저수품종에서 크고 다수품종에서 작은 것으로 나타났다. 11. 수량은 간장, 건물중, 수당립수 및 1,000립중 등과 고도의 유의상관을 나타내었고, 토양pH에 따른 이들 상관정도의 차이는 현저하지 않았다.

• 한국작물학회지
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• 제39권5호
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• pp.405-411
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• 1994

벼 담수직파재배에서 적정 파종양과 입모수 설정을 위하여 낙동벼와 삼강벼를 공시하여 5월 4일 작물시험장 답작포장에서 파종양을 달리하여 시험한 결과를 요약하면 다음과 같다. 1. 공시품종 모두 파종양이 증가할수록 최고분얼수는 많아졌고 유효경비율은 저하하였다. 2. 공시품종 모두 파종양이 증가할수록 유효분얼한계기는 앞당겨지는 것으로 나타났으며 3. 5kg/10a 파종구의 유효분얼 한계기는 6월 18일 전후이었다. 3. 단위면적당 수수는 공시품종 모두 파종양이 증가할수록 많아졌다. 수당영화수는 낙동벼에서는 파종양의 증가에 따라 차이가 없었으나 삼강벼에서는 감소하였다. 4. 파종양이 증가할수록 낙동벼의 등숙률은 떨어 졌으나 삼강벼에서는 차리가 없었다. 5.$m^2$당 적정 입모수는 삼강벼에서는 120개 정도, 낙동벼에서는 78개 정도이었으며 파종양으로 볼 때 삼강벼는 4kg /10a, 낙동벼는 2.7kg /10a 정도가 적당하였다.

• 한국주거학회논문집
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• 제17권4호
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• pp.15-24
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• 2006

The purpose of this study is to unveil the characteristics of residential space organizations in dementia units. Observation, interview, and drawing analysis of the sample units were used to collect the data for new dementia unit plans. The findings revealed the lack of minimum requirement of residential spaces per person in some sample units, the necessity of consideration of group units, and the change of units based plans to each floor based plans. However, insufficient recreation rooms and the lack of caregivers' resting spaces in the sample units were uncovered. Thus, various recreation rooms such as a reading room, flower room, pottery room, bakery room, or game room should be provided in the sample units. The conclusion is that asylum oriented residential types should be changed to each floor based units having privacy and high satisfaction of residential life. The study of floor oriented residential units focusing on minimum spaces of the floor, space numbers, number of elderly persons on each floor should be studied in the near future.

• 대한기계학회논문집
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• 제8권1호
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• pp.1-9
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• 1984

In the utilization of solar energy most often a flat solar collector is used for solar heating, system. Since solar energy is absorbed through this solar collector, it is considered to be a most important part in the whole solar heating system. The purpose of the present investigation is to evaluate the influence of varying design parameters for thermal performances of flat-plate solar collector. By analysing these parameters, optimum design of solar collector would become possible. Specification of the existing solar collector are utilized in calculation as a starting point. Analysis is carried out numerically for "Unit Solar Collector" which is composed of fin and tube. Among design parameters. such parameters as mass flow rate per unit area, tube spacing and fin thickness are selected as variables in the computer simulation model. Results are presented for thermal performances of flat-plate solar collector for each important design parameters, so that predictions become possible through numerical analysis without performing experiments whenever it is required. required.