• International Journal of Railway
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• 제2권2호
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• pp.60-69
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• 2009

In recent years, technology developments in different countries, especially in newly industrialized countries, are extremely indebted to appropriate technology transfer by these countries. Nevertheless the technology transfer process in the present situation is complex, and its success is related to the coordination rate with the political, economic, social, and environmental objectives of countries. Today debates related to the transfer of the technical know how accompanied by equipment hardware has found remarkable importance such that countries seek increasing comprehensive capabilities in the field of transferred technology for which Preventive Maintenance (PM) is one of the aspects. This research with the purpose to determine the technological capability level and to study the role of PM in the effective & appropriate technology transfer in subway industry is carried out for presenting a suitable model for the technology transfer in this industry with an attitude towards the effects of principal PM factors. For this purpose, after the study of different and relevant models existing in the field of suitable methods for technology transfer, some equipment PM theories and models were selected as the base for the compilation of the questionnaire. With the help of questionnaire, main PM factors that are effective in the field of technology transfer were extracted, and finally, their effects on technology transfer were analyzed, identified and a comprehensive model suggested in this connection.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.251.2-251.2
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• 2010

Plant biomass has been proposed to be an alternative source for petroleum-based chemical compounds. Especially, phenolic chemical compounds can be obtained from lignin by chemical depolymerization processes because lignin consists of complex aromatic polymer such as trans-p-coumaryl, coniferyl and sinapyl alcohols, etc. Phenolic chemical compounds from lignin were usually produced in super critical water. However, we applied Near-critical water (NCW) system because NCW is known as a good solvent for lignin depolymerization. Organic matter like lignin can be solved in NCW system and the system has a unique acid-base property without conventional non-eco-friendly chemicals such as sulfuric acid and sodium hydroxide. In this work, we tried to optimize the NCW depolymerization system by adjusting the processing variables such as reaction time, temperature and pressure. Moreover, the amount of additional phenol was optimized by changing the molar ratio between water and phenol. Phenol was used as capping agent to prevent re-polymerization of active fragment such as formaldehyde. Alkali-lignin was used as a starting material and characterized by a Solid State 13C-NMR, FT-IR and EA (Elemental Analysis). GC-MS analysis confirmed that o-cresol, p-cresol, anisole and 4-hydroxyphathalic acid were the main product and they were quantitatively analyzed by HPLC.

• 한국주거학회논문집
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• 제27권1호
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• pp.41-50
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• 2016

This study aims to draw the factors of support and restriction as children play in the outdoor space through their participation. The 135 students (fifth- and sixth- graders) participated in the research using the mapping method included the daily diagram and the open-ended questionnaire. As the research results, the park, the school yard, the playground and the rest space were emerged as play spaces with high utilization rate. Through the analysis of play spaces based on children's perception, the physical and social-psychological factors are drawn as the factors of support and restriction. Some physical factors such as the location are relevant to social-psychological factors such as the friend and the danger. In conclusion, the physical factors which support or restrict children's activities have to be considered with the socialpsychological factors. And the result from children's experience and perception should be basis of providing appropriate spaces for children who are actual users of play spaces.

• 한국빅데이터학회지
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• 제1권2호
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• pp.45-63
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• 2016

최근 기후변화 및 사회구조 변화에 따라 신종 또는 복합재난 발생빈도가 증가하고 있으며 재난예방의 중요성이 증가하고 있다. 중앙 및 지방정부에서의 재난예방활동 중 가장 대표적인 시설 안전관리에 대한 유용한 정보를 제공하기 위해 국민안전처의 "안전신문고" 주요처리사례 데이터를 활용하여 주민이 신고한 위험시설 신고내용의 키워드를 파악하여 시설간 계절 및 지역별 신고 분포 현황을 분석하였다. 이를 위해 사회 연결망 분석기법을 활용하여 시설 키워드를 중심으로 1-mode, 2-mode를 구성하였으며 계절별, 지역별로의 분포 차이를 분석하였다.

• 한국전자통신학회논문지
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• 제10권9호
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• pp.993-1000
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• 2015

MFCC는 음성 신호 처리에서 귀중한 특징 벡터들 중 하나이다. MFCC에서 명백한 결점은 푸리에 변환의 크기를 취함에 의해 위상 정보가 손실된다는 것이다. 이 논문에서 우리는 푸리에 변환의 실수부와 허수부 크기를 따로 취급함으로써 위상 정보를 활용하는 방법을 생각한다. 퍼지 벡터 양자화와 은닉 마코브 모델을 이용한 음성인식에 이 방법을 적용함으로써, 종전 방법에 비해 음성 인식 오류율을 줄일 수 있음을 보인다. 우리는 또한 수치해석을 통하여, FFT의 실수부와 허수부 각각에서 6개의 성분을 취하여 모두 12개의 MFCC 성분을 사용하는 것이 음성인식에 최적임을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권9호
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• pp.4342-4366
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• 2016

Congestion control in Cluster Wireless Sensor Networks (CWSNs) has drawn widespread attention and research interests. The increasing number of nodes and scale of networks cause more complex congestion control and management. Active Queue Management (AQM) is one of the major congestion control approaches in CWSNs, and Random Early Detection (RED) algorithm is commonly used to achieve high utilization in AQM. However, traditional RED algorithm depends exclusively on source-side control, which is insufficient to maintain efficiency and state stability. Specifically, when congestion occurs, deficiency of feedback will hinder the instability of the system. In this paper, we adopt the Additive-Increase Multiplicative-Decrease (AIMD) adjustment scheme and propose an improved RED algorithm by using neighbor feedback and scheduling scheme. The congestion control model is presented, which is a linear system with a non-linear feedback, and modeled by Lur'e type system. In the context of delayed Lur'e dynamical network, we adopt the concept of cluster synchronization and show that the congestion controlled system is able to achieve cluster synchronization. Sufficient conditions are derived by applying Lyapunov-Krasovskii functionals. Numerical examples are investigated to validate the effectiveness of the congestion control algorithm and the stability of the network.

• Journal of Biosystems Engineering
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• 제24권5호
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• pp.399-406
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• 1999

This study was conducted to investigate the labor requirements and transportation cost of paddy for the different harvest and transportation systems for obtaining a basic reference to the improvement of present harvest-transportation systems. One hundred and eighty five farm households with sack type combine harvester and thirty farm households with bulk type combine harvester were surveyed for thirty counties from eight provinces except jeju and also eleven Rice Processing Complex were covered for this survey. This survey was carried from 8th. October 1997 to 5th. November 1997. For the labor requirements, bulk trailer system require 6.8th/ha, 10.3/ha for sack harvest-tractor trailer, and 8.8h/ha for bulk harvest-container bag. The machinery utilization cost for the different paddy harvest-transportation systems, combine sack harvest-tractor trailer system is 282 thousand won/ha, and most economical compared with other systems. Combine bulk harvest with tractor system was 416 thousands won/ha and combine bulk harvest with container bag system was 446 thousands won/ha. In order to propagate bulk harvest-transportation system, a proper bulk transportation means with considering road condition in the paddy field and paddy size should be developed, and considering cycle time it appeared that the proper capacity of bulk container was 3.5ton at the present.

• 한국콘텐츠학회논문지
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• 제6권5호
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• pp.113-121
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• 2006

인터넷의 발전과 더불어 웹 사이트는 점점 더 복잡해지고 있으며, 사이트의 유지보수에 많은 시간과 비용이 소요된다. 또한 대용량 콘텐츠의 급증으로 서버와 네트워크의 부하가 가중되고 서비스의 질이 떨어지는 문제점이 있다. 이에 본 논문에서는 콘텐츠의 구축 및 관리가 용이할 뿐만 아니라, 구축된 콘텐츠의 활용을 극대화하기 위하여, 분산형 콘텐츠 수집 및 탐색에 기반한 머천트(Merchant system)와 개인정보(Personal Information Management System)가 결합된 통합콘텐츠관리시스템을 설계하고 구현하였다.

• 한국가금학회지
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• 제19권3호
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• pp.161-176
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• 1992

콕시듐병은 감수성이 있는 숙주의 장에 주로 감염된 Eimeria에 의하여 일어나는 것으로 가축과 가금의 성장과 사료이용에 막대한 해를 미친다. Eimeria속에 속하는 원충은 주로 세포내에 기생하며 무성생식과 유성생식을 거쳐야 하는 매우 복잡한 생활사를 가진다. Eimeria에 대한 백신개발은 주로 방어면역의 기전과 백신에 사용될 수 있는 항원을 찾는 방면으로 활발한 연구가 이루어지고 있다. 원충은 질병 본래의 모습이나 전파방법이 독특하므로 원충성 질병의 방제에 있어서는 이러한 점이 충분히 숙고되어야 할 것이다. 난해하고 복잡한 세포나 세포 분비물질간의 작용은 콕시듐병의 병성기전 뿐 아니라 방어 면역의 형성에도 매우 깊이 관여하고 있다. 따라서, Eimeria의 감염에 따른 방어기전을 충분히 이해하는 것이 가장 좋은 백신을 개발하는 첩경이 될 것이다.

• 한국보건간호학회지
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• 제30권2호
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• pp.259-273
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• 2016

Purpose: The purpose of this study was to explore the barriers and solution of providing long-term care (LTC) services at home for the beneficiaries with mild dementia. Methods: The data were collected by interviewing three focus groups consisting of 10 home-visit nurses and analyzed through the analytic process by Morgan and Krueger. Results: The barriers of providing LTC services for clients were identified as follows: inadequateness of the current LTC model for elderly individuals with mild dementia and inappropriateness of the personal environment for home care. The solutions for these barriers were suggested as follows: building up a safe environment for home care and maintaining an appropriate standard utilization plan of LTC service. Conclusion: The current service model for the beneficiaries with mild dementia should be modified in order to provide comprehensive long-term care services based on their complex needs.