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복소 주파수 성분 처리를 통한 TR-UWB 시스템의 성능분석
장동헌,양훈기,Jang, Dong-Heon,Yang, Hoon-Gee 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.2
본 논문에서는 UWB 펄스 신호를 주파수 성분으로 분리해서 수 MHz정도의 ADC로 디지털 구현이 가능한 새로운 구조의 TR-UWB 시스템의 성능을 수학적으로 분석한 후 기존 시스템과 이론적으로 비교한다. TR-UWB 신호의 주파수 변환 특성 및 복소수 성분들의 평균, 분산 값을 유도하여 이를 활용한 이론적인 SNR 계산을 통해 시스템 성능을 분석하고 SNR 비 관점에서 기존 시스템과의 성능을 비교한다. 모의 실험에서는 AWGN 환경과 IEEE 802.15.3a의 다중경로 채널 환경에서의 BER을 통해 제시한 TR-UWB 시스템의 성능이 기존 시스템보다 우수함을 보인다. This paper, mathematically analyzes the performance of newly proposed TR-UWB system which the frequency components of a UWB pulse were processed so that the system could be implemented with ADCs of a few MHz sampling rate, and presents the comparison with an existing frequency-domain based TR-UWB system. The comparison is mainly based on the SNR ratio which depends on the mean and the variance of the frequency components. We also shows that the simulation results to support the theoretical analysis where the comparison is made under the IEEE 802.15.3a channel model as well as AWGN channel.
조사논문 : 가축분뇨 액비 이용농가의 중요도-만족도 분석
장동헌 ( Dong Heon Jang ),이상현 ( Sang Hyun Lee ),유찬주 ( Chan Ju Yu ) 한국축산경영학회,농업정책학회(구 한국축산경영학회) 2013 농업경영정책연구 Vol.40 No.3
To devise livestock manure utilization, this study analyzed importance and performance of farmers using livestock liquid manure by using IPA technique. Typically the main results and implications are as following. First, the surveyed farmers` agricultural products were rice (35.6%), fruits (17.8%),vegetables (43.6%) and their average age was 53.1 years old. The reason of livestock manure use was mainly recommendations from other farmers or agriculture-related organizations. 46.5% of them were experiencing conflicts with neighbours because of stench. Second, for the importance-performance of livestock liquid manure, importance was assessed by stench, fermentation degree, dusting impact, ingredient indication and uniform quality, whilst performance was done by chemical fertilizer reduction, circulation agriculture acknowledgement, subsidy and yields. Third, according to the matrix comparison analysis of pre- and post-use of livestock liquid manure, areas that need to be improved were shown at IV quadrant, which were ingredient indication, recommended rate of application, uniform quality, soil pollution degree, expert consultation/education, stench degree and ferment-ation degree. Therefore, it would be necessary to develop a systematic and comprehensive approach in order to improve the IV quadrant items. Furthermore, an intensive improvement would be required to achieve the desired results for the livestock liquid manure resource project.
장동헌 ( Dongheon Jang ),이상현 ( Sanghyun Lee ),한상섭 ( Sangsub Han ) 한국협동조합학회 2010 韓國協同組合硏究 Vol.28 No.1
In this study, we examined the development plans of producer organization on the basis of the investigation on producers`` awareness and distribution status of rhododendron farms. The key contents and suggestions are as follows. First, the technical standard of producers was of a high level and the difficulty experienced by producers was market and price instability. In addition, soil management was limited to fertilization and control of insect pests. Also, there was insufficiency of discussions on farming plans among producers. Therefore, it is necessary to establish composite farming plans as well as to pursue joint purchasing of farming materials, scientific soil management and introduction of programs toactivate the organization. Second, rhododendron distribution mainly took place as trading at farming yards and the price was determined largely by merchants. For marketing, there was lack of distribution information and insufficient securing of trading partners. Therefore, it is necessary to improve price negotiation power, to establish a landscaping plant distribution center and to promote the 6th industrialization, etc. Third, in the long-term perspective, it will be necessary to establish the basis for R&D and implementation of hub for rhododendron industry.
장동헌 ( Dong Heon Jang ),송춘호 ( Chun Ho Song ) 한국협동조합학회 2011 韓國協同組合硏究 Vol.29 No.3
In this research, the relative efficiency for the forestry cooperative was analyzed. Models of analysis were used the CCR and BCC model, the super-efficiency model for the analysis of priority. The 72 of the nation`s Forestry Cooperative were targeted for the analysis. The major results of this research are as follows. First, the average of inputs and outputs was 23 people for the number of employees, 1,177 million won for the distribution and the administrative costs, 3,444 million won for the equity capital, 98.5 million won for the fixed assets, 1,526 million won for the profit of credit business and 4,671 million won for the profit of general business. Second, the average of efficiency was 0.7978 for the technical efficiency, 0.8857 for the pure technical efficiency and 0.8951 for the scale efficiency. Third, the distribution of efficiency were 20.8% for not violated, 15.3% for weakly violated, 26.4 % for moderately violated and 37.5% for strongly violated in case of CCR model, and 31.9% for not violated, 16.7% for weakly violated, 45.8% for moderately violated and 5.6% for strongly violated in case of BCC model, respectively. DMU02, DMU50 and DMU19 were mainly referred in the reference group. Finally, the super-efficiency based on the result of CCR super-efficiency analysis was 0.8417 for the average, and the priority for DMU obtained the same efficiency in the CCR model was distinguished.
장동헌 ( Dong Heon Jang ),이용기 ( Young Ki Lee ) 전북대학교 농업과학기술연구소 2018 농업생명과학연구 Vol.49 No.1
In recent years, as the demand for urban people has been continuously increasing for rural experience, it can be used as basic data for constructing images of various experiences in rural areas. In addition, since it is the data that can grasp the emotional image of the urban people about the image of the rural experience, it is necessary to continuously induce the experience of the urban people in the rural area, including opening the import, increasing the income gap between the urban area and the rural area, And it is expected that it will have an opportunity to promote the economic activation of the rural area. This research will be used as a basic data for building a successful image of rural experience by taking into consideration the factors of emotional image in the rural areas of urban residents. However, considering the fact that this study is limited to a simple analysis of the image of rural experience, it will be necessary to improve the quality of research through concrete and accurate statistical analysis in the future and to complement the logic of research.
도시농업의 인식 및 가치평가에 관한 연구 : 전주시 도시민을 사례로
장동헌(Jang Dong-Heon),소순열(Soh Soon-Yeol),유찬주(Yu Chan-Ju) 한국지역사회학회 2006 지역사회연구 Vol.14 No.3
This study considered urban agriculture as an object to be consistently maintained and conserved rather than transient or residual one and approached the urban agriculture from the point of view that regards it as one of local agriculture. In particular, this study estimated the recognition on agriculture of urban residents and the willingness to pay for the purpose of agricultural conservation. Main results can be put in order as follows; First, as for the value of urban agriculture, urban residents gave precedence to the provision of the landscape green zone. And urban residents gave the next precedence to the inheritance value for the next generation. Second, the recognition on conserving the urban agriculture is as follows; In terms of the recognition, the response that should use urban agriculture as other uses through external expansion was higher than the response that should use urban agriculture as a traditional agricultural form. For this purpose, respondents preferred the environmental-friendly development through experience programs and agriculture. Third, the urban resident's willingness to pay the fund for conservation of urban agriculture was 39.6%. It was shown that the fund should be used for the maintenance of landscape, site of field practice, supply of agricultural products, prevention of disaster or conservation of region in the descending order. The willingness to pay the estimated monthly average fund per household was 2,623 won. When applying the willingness percentage to pay, 39.6%, to the applied regions, the willingness to pay was shown as 216 million won for monthly average payment, and 2,592 million won for annual average payment.