• Title, Summary, Keyword: CBFM

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A Fast Computation Method of Far Field Interactions in CBFM for Electromagnetic Analysis of Large Structures (임의 대형구조 전자기 해석을 위한 CBFM의 빠른 원거리 상호 작용 계산 알고리즘)

  • Park, Chan-Sun;Hong, Ic-Pyo;Kwon, Obum;Kim, Yoon-Jae;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.9
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    • pp.701-706
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    • 2018
  • The characteristic basis function method, or CFBM, is one of the representative electromagnetic methods widely used today. In this paper, we propose an accelerating algorithm for the far field interaction calculation of CBFM, to efficiently analyze the electromagnetic characteristics of arbitrarily large structures. To effectively analyze the electromagnetic characteristics of a large structure, it is essential to shorten the computation time. In the CBFM analysis method, the complexity can be greatly reduced by using approximations created via the multipole expansion method. The new algorithm proposed in this paper is applied to the computation of radar cross sections of conductor spheres and fighter aircraft, and it is confirmed that calculation time is reduced by 34 % and 74 %, respectively, without loss of accuracy compared with existing CBFM.

The Impact of Community-Based Forest Management on Local People around the Forest: Case Study in Forest Management Unit Bogor, Indonesia

  • Fajar, Nugraha Cahya;Kim, Joon Soon
    • Journal of Forest and Environmental Science
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    • v.35 no.2
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    • pp.102-114
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    • 2019
  • The issue of sustainable forest management (SFM) continues to emerge as part of the REDD+ mechanism mitigation efforts. Especially for some developing countries, such as Indonesia, forest management is required to provide benefits to the welfare of local communities in addition to forest conservation efforts. This study aims to identify the economic, social, and environmental impacts of community-based forest management (CBFM) implementation activities, which is one of the implementations of SFM at field level. The primary objectives were to find out the impacts of CBFM activities based on local people's perceptions and to identify what factors need to be considered to increase local people's satisfaction on CBFM activities. The data from 6 sub-villages was derived through surveys with local people involved in CBFM activities, interviews with a key informant, and supported by secondary data. The results of the study state that CBFM activities have increased the local people's income as well as their welfare, strengthening the local institution, and help to resolve conflicts in the study area. CBFM has also been successful in protecting forests by rehabilitating unproductive lands and increase forest cover area. By using binary logistic regression analysis, it found that income, business development opportunities, access to forests, conflict resolution, institutional strengthening, and forest rehabilitation variable significantly affected the local people's satisfaction of CBFM activities.

Analysis of genetic characteristics and development of substrate for cultivation in brown strains of Flammulina velutipes (갈색팽이버섯의 유전적 특성검정 및 배지재료 개발)

  • Choi, Jae-Sun;Noh, Jae-Goan;Jang, Who-Bong;Choi, Seong-Yeol;Min, Kyoung-Beom;Kong, Won-Sik
    • Journal of Mushroom
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    • v.5 no.1
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    • pp.13-20
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    • 2007
  • Analysis of genetic characteristics of Flammulina velutipes showed that strains have a range of 85% in genetic distribution diagram. According to this result, we divided these strains into five groups. In experiment of determinating the optimum media and condition in cultivating F. velutipes, we found the optimum temperature and pH range for hypha growth were $25^{\circ}C$ and 6.0 to 7.0, respectively. in addition, the best media for growth of that in plate was MCM (Mushroom Complete Media) which have a growth length from 68 to 83 mm. In vivo test, we observed that fast growth and good density of hyphae in mixture media of douglas fir sawdust, cotton seed meal and beet pulp (6:2:2 V/V). Also when we cultivated F. velutipes in this media, we harvested high yield of fruiting body.

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Perspective on Forest Conservation: A Case Study of Community at Gana Resettlement and Integrated Development Project (GRID), Sabah, Malaysia

  • Yahya, Hardawati;Idrus, Roszehan Mohd.;Talib, Hamimah;Fong, Eunice
    • Journal of Forest and Environmental Science
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    • v.28 no.3
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    • pp.185-193
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    • 2012
  • This study was carried out in Gana Resettlement and Integrated Development (GRID) Project as a pioneer model for Community-Based Forest Management (CBFM) in Sabah, Malaysia. The GRID project is developed to improve community livelihood as well as to promote community involvement in CBFM and at the same time to lessen community encroachment and traditional farming practices inside the forest conservation area. The objectives of this study are: (i) to identify the dependency of local community on forest resources; (ii) to examine local community's roles in conserving forest resources and, (iii) to analyze their views on GRID project in conserving forest. Interviews were conducted with randomly selected 130 households at the GRID project using semi structured questionnaires comprising closed and open-ended questions. The study reveals that community dependency on forest resources have lessened after the resettlement of the GRID project. The community shows positive perspective on their contribution for conserving the forest resources. However, the community's willingness to contribute as well as their real contribution can be further improved. The study recommends the government to create more effective training and relevant activities to improve the livelihood of community as well as to increase their positive perception on forest conservation efforts. Further research to strengthen the relationship between local community and forest governance through forest conservation is also recommended.

A Development of Construction Industry Production Index(CIPI) with Temperature Effects (기온효과를 고려한 건설업생산지수 예측모델 개발)

  • Kim, Seok-Jong;Kim, Hyun-Woo;Chin, Kyung-Ho;Jang, Han-Ik
    • Korean Journal of Construction Engineering and Management
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    • v.14 no.5
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    • pp.103-112
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    • 2013
  • After 1990s, the influence of construction industry has been decreased on national economy and construction business condition has been changed on economic recession and boom repeatedly. Larger fluctuation of business condition makes a forecast of it to be more difficult. Uncertainty in business prediction results in damages on construction companies and stakeholders. Therefore, study on forecasting a construction business is very important. This study suggests the Construction Industry Production Index(CIPI) to predict a construction business in consider of temperature effects. The results show that construction business is much influenced by temperature effects certainly and GDP. With the CBFM, this study examines CIPI for 2013 with two scenarios: 1)with GDP growth rate of 3.5% 2)with GDP growth rate of 2.4%. Thus, CIPI would be used as the economic state index to display the construction business conditions. Also, CIPI will be utilized as basic methodology in the impact of climate change in the construction industry.