• 한국유기농업학회지
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• 제6권1호
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• pp.45-50
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• 1997

Cultivation of peach by organic farming and cooperative form of work was attempted. The compost was made from egg shells and bread residues(bakery residues), falling leaves, and weeds. The cooperative teams of work were farmers, students and members of citizens' movement. The responses of participants for composting, though it's laboriousness and dirtiness, were favorable with feeling of doing good for social services. 20 chickens were raised in the peach orchard as one of the mixed farming. The pH and Ca content of ripened compost were 7.7 and 1.57 %, respectively. Controlling Aphids(plant louse)by ladybug was observed vividly. The size and sugar concentration were comparable to standard values even though rainy season and the number of damaged fruits were less than half(40%).

• Journal of Biosystems Engineering
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• 제28권4호
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• pp.285-294
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• 2003

This study was carried out to propose a new-concept internal combustion engine which has great potential advantages to the conventional engines. Proposed new-concept engine is a kind of rotary engine. A rotor is rotating concentrically in a cylinder which is divided into two partitioning valves, and it makes four compartments in the cylinder. The volumes of each of four compartments are changing continuously with the rotor movement and performs the functions of intake, compression. expansion and exhaust simultaneously. Expected thermal efficiency for the real cycle is 26 percent at conditions of 1,000 rpm and compression ratio of 8.0, which is 3 to 4 percent higher than that of the conventional engines such as the piston engine, gas turbine and Wankel rotary engine. A simulation procedure proved that the new concept engine is functional, and has many potential advantages compared to the existing conventional engines.

• Journal of Ubiquitous Convergence Technology
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• 제1권1호
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• pp.53-59
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• 2007

This paper proposes a new group mobility model for wireless communication. The mobility model considers the psychological and sociological behavior of each node and the perception of other nodes for describing interactions among a set of nodes. The model assumes no permanent membership of a group, capable of capturing natural behaviors as fork and join. It emulates a cooperative movement pattern observed in mobile ad hoc networks of military operation and campus, in which a set of mobile stations accomplish a cooperative motion affected by the individual behavior as well as a group behavior. The model also employs a physic model to avoid a sudden stopping and a sharping turning.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.871-872
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• 2014

이 논문에서는 군집 로봇들이 미로 탈출을 위해 협력하는 방법에 대해 제안한다. 로봇들은 ZIGBEE로 서로 통신할 수 있으나 로봇들의 연산기능이 낮아 중앙제어 시스템이 로봇들에게 명령을 전달한다. 로봇들은 보이지 않는 미로를 탐색하며 지도를 만들기 위해 이동과 같은 정보를 중앙제어 시스템에 전송한다. 중앙제어시스템은 수신된 데이터를 분석하여 미로 탈출을 위한 경로를 찾는다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.253-253
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• 2000

Each robot plays a role of its own behavior in dynamic robot-soccer environment. One of the most necessary conditions to win a game is control of robot movement. In this paper we suggest a win strategy using Cellular Neural Network to set optimal path and cooperative behavior, which divides a soccer ground into grid-cell based ground and has robots move a next grid-cell along the optimal path to approach the moving target.

• 디자인학연구
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• 제20권
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• pp.161-171
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• 1997

유미 운동은 산업화에 대한 반발하며 디자인의 질을 고양시켜 삶의 질을 향상시키자는 미적 운동이었다. 유미 운동은 대중에게 미적 감각을 심어주어 대중의 생활의 질을 개선하고 따라서, 디자인의 질을 개선하며 예술을 위한 예술을 추구하는 운동이었다. 이러한 유미 운동의 밑거름이 되는 유미주의는 총체적인 미적 개념을 강조하였으며, 이러한 미적 개념은 텍 스타일 디자인 운동에 새로운 활기를 불어넣어 주었다. 본 논문은 기계생산이 불러일으킨 빅토리아 사회를 정화시키고 미적 감각을 전하는 유미주의에 대한 연구를 통하여 유미주의 이 텍 스타일을 디자인에 미친 영향을 연구하고자 한다. 본 연구를 통한 유미주의가 텍 스타일 디자인에 미친 영향은 다음과 같이 분석된다 : 첫째로, 일본예술의 영향으로 텍 스타일 디자인을 2차원적으로 접근하도록 유도하여 단순하고 담대한 성격의 디자인으로 이끌었다. 둘째로, 라파엘 전파의 운동의 영향으로 텍 스타일 디자인의 색채는 연한 색조를 띠게 되었다. 셋째로, 모리스의 자연을 영감으로 한 창의적인 디자인이 성공적인 경지에 오르면서 디자인의 질이 향상되는데 이바지하게 되었다. 넷째로, 유미 운동의 절대적인 영향을 받은 리버티 회사의 창의적인 디자인은 미적 추구를 위함과 동시에 디자인의 질을 향상시키려는 모리스, 고드 윈, 루이스 데이 등의 노력에 합세하여 궁극적으로 창의적인 현대의 영국의 텍 스타일 디자인을 이룩하는데 지대한 공헌을 하였다.

• 현장농수산연구지
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• 제15권1호
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• pp.25-43
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• 2013

Tasmania with its clean air, isolated from mainland Australia, has been producing high-quality agricultural products and has been continually developing organic farming since 1946 when the Living Soil Association of Tasmania(LSAT) was established. The organic farming movement in Tasmania has been actively advocated through three steps: the philosophical embryonic period, the movement diffusion period and the industrialised development period. The campaigns for informing about the connection between healthy soil and life unfolded during the embryonic period. This was followed by the birth of publicity of organic farming and the certification system through the dissemination of organic farming techniques and various events related to agriculture in the diffusion period when the Organic Gardening and Farming Society(OGFS) was established in 1972. In the industrialised development period, The Organic Coalition of Tasmania (OCT) which is representative of Tasmania was organised in 2000 and has been leading the organic farming industry. The organic farming movement in Tasmania not only limits the use of artificial agricultural chemical but pursues the quality of food, environment, the health of life including all animals and plants, the issue of development in rural society, social justice, and equity in understanding. It is far more holistic in its philosophy. The output of organic food accounts for 1 % of the total amount of agricultural production and 150 certified organic farms have managed with 5,000ha of land in 2010. The supply channels for organic foods vary from farmer's market, specialty stores, supermarket chains, local store to the cooperative community. Also the consumers' behaviour for organic foods has been establishing as an alternative life style. The education of the value and role of organic farming on the environment should be enlarged for the consumption of the organic food. In addition, organising for small farmers who act individually and the link with differentiated local food have still remained issues.

• 경영과학
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• 제26권3호
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• pp.23-35
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• 2009

This study deals with the location management in WCDMA (Wideband Code Division Multiple Access) networks. The new location management method is the one of the many techniques used to provide the packet switched (PS) services effectively in WCDMA networks. WCDMA introduces RA (routing area) for the PS services in addition to LA (location area) for the circuit switched (CS) services. WCDMA system also adopts the cooperative paging and the combined area update which are to decrease signaling traffic using the PS network resources for the CS services. Considering the characteristics of the WCDMA networks, this study formulate into the mathematical programming problem for the location management. Rather than the existing researches which consider the single MSC/SGSN networks, we deal with the multi MSC/SGSN networks, where both MSC area and SGSN area should be determined as well. Fairness between traffic loads of MSC/SGSN and the system cost incurred to MSC/SGSN are also incorporated into our model, which make the model more realistic. We propose greedy algorithms for the problems, which consists of the merger of two neighboring areas and the movement of an area. Extensive experiment has been done based on the realistic problem examples. Followed by the analysis of parameter effect on the final solutions and the quality of final solutions obtained by our greedy algorithms. Our proposed model and analysis result can be used to determine WCDMA system areas and to predict the system performance measures by the determination.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권11호
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• pp.5253-5270
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• 2016

With device-to-device (D2D) communications, an inactive user terminal can be utilized as a relay node to support multi-hop communication so that connective experience of the cell-edge user as well as the capacity of the whole system can be significantly improved. In this paper, we investigate the spectrum sharing for a cooperative relay assisted D2D communication underlying a cellular network. We formulate a joint relay selection and channel assignment problem to maximize the throughput of the system while guaranteeing the quality of service (QoS) requirements of cellular users (CUs) and D2D users (DUs). By exploiting coalition formation game theory, we propose two algorithms to solve the problem. The first algorithm is designed based on merge and split rules while the second one is developed based on single user's movement. Both of them are proved to be stable and convergent. Simulation results are presented to show the effectiveness of the proposed algorithms.

• 한국전자파학회논문지
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• 제23권8호
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• pp.985-994
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• 2012

본 논문에서는 wireless body area network(WBAN) 채널을 분석하기 위해 실제 채널을 측정하고, 그것의 통계적 특성들을 조사하였다. On-/off-body 채널에서, 인체의 움직임을 고려하기 위해 대표적인 움직임들을 같이 측정하여 그 분석 결과들을 비교하였다. 또한, 세 종류의 신호 전송 기법을 제한된 Outage 확률을 가질 때 최소 소비 전력을 분석하여, 이론적인 총 전력 소비를 계산하였다. 그리고 채널 측정 데이터들을 통해 이론과 실제의 차이를 분석하였다. 본 논문의 결과로 협력 통신을 통하여 전송 효율을 높일 수 있음을 알 수 있으며, 센서 노드의 부착 위치와 움직임이 신호 전송 전력에 어떠한 영향을 미치는지 확인할 수 있다.