• Journal of Biosystems Engineering
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• 제35권2호
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• pp.77-84
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• 2010

In this study, we tried to predict tractor power output, fuel consumption rate and work performance indirectly in order to develop an eco driving system. Firstly, we developed equations which could predict tractor power output and fuel consumption rate using characteristic curves of tractor power output. Secondly, with actual engine rpm determined by initial engine rpm and work load, tractor power output and fuel consumption rate were forecasted. Thirdly, with speed signals of GPS sensor system, it was possible to foresee tractor work performance and fuel consumption rate. Lastly, precision of the eco driving system was evaluated through tractor PTO test, and effects of the eco driving system were investigated in the plowing and rotary tilling operations. Engine rpm, power output, fuel consumption rate, work performance and fuel consumption rate per plot area were displayed in the eco driving system. Predicted tractor power outputs in the full load curve were well coincided with the actual power output of prototype, but small differences, 1 to 6 ㎾, were found in the part load curve. Error of the fuel consumption rate was 0.5 L/h, 4.5%, the greatest, and 1 to 3 L/h at the part load curve. It was shown that 69% and 53% of fuel consumption rates could be reduced in plowing and rotary tilling operations, respectively, when the eco driving system was installed in tractor.

• 한국태양에너지학회 논문집
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• 제34권5호
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• pp.117-126
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• 2014

This study developed a KRESS program designed to find the optimization ratio for new and renewable energy systems and analyze the effects of building energy consumption characteristics on the ratio. In spite of clear differences in predicted energy consumption and energy consumption by the loads among 18 facilities, the current formula for obligatory supply ratios applies a correction coefficient according to the building purposes based on energy consumption per each unit area in medical facilities and thus reflects no energy consumption characteristics according to the building purposes. The optimization ratio for new and renewable energy systems was the same for all facilities when the correction coefficients by the building purposes and new and renewable energy sources were all applied. When the correction coefficients were not applied, however, the optimization ratio varied according to building energy consumption characteristics. The findings raise a need to test the correction coefficients in order to select new and renewable energy systems that take into account energy consumption characteristics by the building purposes and loads and reflect economy, environmental performance, and technology.

• 국제지역연구
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• 제15권3호
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• pp.191-213
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• 2011

본 연구는 소비위험분산 목적으로 실행된 소득위험분산이 실질적으로 소비위험분산에 기여할 수 있는지 여부를 실증분석을 통하여 검증한다. 국가 간 생산요소 이동에 따른 순요소소득의 발생은 국가 간 소득위험분산의 주요 수단 중 하나이다. 순요소소득 변화가 소비 변화에 미치는 영향과 GDP 변화가 소비 변화에 미치는 영향이 동일하다는 선행연구의 가정 하에서 국가 간 생산요소 이동을 통한 소득위험분산은 소비위험분산에 기여하는 것으로 여겨졌다. 1999년부터 2010년 기간 중 EU 12개 국가들의 사례를 통한 본 연구의 실증분석 결과 순요소소득에 대한 소비반응은 GDP에 대한 소비반응보다 낮으며, 더 나아가 순요소소득의 변화가 소비의 변화에 미치는 영향은 매우 낮은 것으로 나타났다. 따라서 순요소소득과 GDP 각각에 대한 소비반응이 동일하다는 기존 선행연구의 가정 하에서, 국가 간 생산요소 이동을 통한 소득위험분산의 소비위험분산에 대한 기여도는 과대평가되었음을 본 연구는 암시한다. 본 연구는 국가 간 생산요소 이동을 통한 소득위험분산이 실질적으로 소비위험분산에 기여하도록 하기 위해서는, 순요소소득이 소비에 유의하게 영향을 미칠 수 있어야함을 시사하며, 따라서 국외로부터의 순요소소득이 보다 직접적으로 소비로 귀결되기 위한 법제도 및 관련 시스템의 개선이 필요할 것이다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1073-1076
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• 2009

The dependences of color gamut size and power consumption on the area ratio of neutral and green sub-pixels for the RGBW LCD with RGB LED backlit are studied, in which the areas of red and blue sub-pixels are the same and are one quarter of pixel apertu re area. It is found that high color saturation and power saving can be achieved for the proposed RGBW LCD.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 하계종합학술대회 논문집(2)
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• pp.459-462
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• 2004

In this paper, we present a reducing power consumption of a scheduling for module selection under the time constraint. A a reducing power consumption of a scheduling for module selection under the time constraint execute scheduling and allocation for considering the switching activity. The focus scheduling of this phase adopt Force-Directed Scheduling for low power to existed Force-Directed Scheduling. and it constructs the module selection RT library by in account consideration the mutual correlation of parameters in which the power and the area and delay. when it is, in this paper we formulate the module selection method as a multi-objective optimization and propose a branch and bound approach to explore the large design space of module selection. Therefore, the optimal module selection method proposed to consider power, area, delay parameter at the same time. The comparison experiment analyzed a point of difference between the existed FDS algorithm and a new FDS_RPC algorithm.

• 환경위생공학
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• 제8권1호
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• pp.49-67
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• 1993

Rapid economic development and increase of energy consumption in east Asia including China, Korea and Japan has arisen a concern in air pollution problems in local and regional scale. Specially, China is accomplishing a success in continuous economic growth, while increasing energy consumption has caused a load to air quality because major energy source is coal which is relatively unfavorable in terms of air pollution. In this article, discussions have been given with the purpose of gaining some insight into the situation of air pollutant sources, air quality in China and transboundary transport of air pollutants in this area. Very limited information has caused insufficient survey, however, regional cooperation in environmental conservation may hopefully improve the air quality in this area.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1133-1136
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• 1998

본 논문에서 최적화이론이란 이 논문에서 두 개의 회로를 비교하고 트랜지스터의 개수를 적게 사용하여 전력소비를 줄일 수 있었고, 면적을 적게 축소하였다. 그리고 입출력에서 사용하는 제어는 크게 두 개로 나누었다. 첫 번째로 인버터를 사용해서 순차적으로 진행하도록 한 파이프라인의 회로를 설계하였고, 두 번째로 논리회로를 이용해서 n개의 MUX를 동시에 동작하도록 제어하였다. 두 개의 회로에서 트랜지스터의 개수와 반도체 칩의 면적 그리고 소비전력을 비교하여본다.

• ETRI Journal
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• 제35권6호
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• pp.1144-1147
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• 2013

Dual-mode terminals (DMTs) equipped with cellular and WLAN interfaces have become popular in recent years. Users of DMTs can enjoy high-speed WLAN Internet access and wide area Internet access to cellular networks. However, a DMT may consume power inefficiently when discovering a WLAN with inherently limited service coverage. In this letter, we propose to use smart WLAN discovery (SWD) to minimize the power consumption required for WLAN discovery. To minimize the power consumption of a DMT, an SWD DMT activates its WLAN interface only when the DMT transfers data within the WLAN coverage area. The simulation results of SWD show an improved power-saving performance compared to previous WLAN discovery schemes.

• 동아시아식생활학회지
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• 제20권1호
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• pp.11-19
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• 2010

This study was conducted to investigate consumer behavior and perception related to alcoholic beverages and Korean rice wines (yakju). Self-administered questionnaires were collected from 254 male and female adults in the Gyunggi-area of Korea. Male respondents were significantly more likely to drink more often, consume greater amounts and spend more on alcoholic beverages. Male respondents preferred, in order, soju, beer and wine. Female respondents preferred, in order, beer, wine and soju. Most of the respondents (69.2%) showed conservative consumption behaviors, and indicated they would drink a new product when it became popular. Flavor/taste was the most important attribute when selecting alcoholic beverages. The reasons for drinking yakju were "high quality" and "considering health". The most answered reason for low market share of yakju was lack of publicity and marketing.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.291-294
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• 1999

This paper presents a GaAs MESMET self oscillating mixer for high efficiency L-band frequency conversion with small chip area consumption. Main circuit topology is consist of cascoded two FET with resonating part. The circuit is designed as unstably nonlinear for limited frequency band. FET with drain shorted to source is used for frequency tuning element. Linear conversion gain of -18.83 ㏈ is achieved with 9mA and 4V consumption. Input 1㏈ compression point is more than 11㏈m. The chip area is 1.4$\times$1.4 mm.