• Wind and Structures
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• 제34권2호
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• pp.231-257
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• 2022

Transmission lines systems are important components of the electrical power infrastructure. However, these systems are vulnerable to damage from high wind events such as hurricanes. This study presents the results from a 1:50 scale aeroelastic model of a multi-span transmission lines system subjected to simulated hurricane winds. The transmission lines system considered in this study consists of three lattice towers, four spans of conductors and two end-frames. The aeroelastic tests were conducted at the NSF NHERI Wall of Wind Experimental Facility (WOW EF) at the Florida International University (FIU). A horizontal distortion scaling technique was used in order to fit the entire model on the WOW turntable. The system was tested at various wind speeds ranging from 35 m/s to 78 m/s (equivalent full-scale speeds) for varying wind directions. A system identification (SID) technique was used to evaluate experimental-based along-wind aerodynamic damping coefficients and compare with their theoretical counterparts. Comparisons were done for two aeroelastic models: (i) a self-supported lattice tower, and (ii) a multi-span transmission lines system. A buffeting analysis was conducted to estimate the response of the conductors and compare it to measured experimental values. The responses of the single lattice tower and the multi-span transmission lines system were compared. The coupling effects seem to drastically change the aerodynamic damping of the system, compared to the single lattice tower case. The estimation of the drag forces on the conductors are in good agreement with their experimental counterparts. The incorporation of the change in turbulence intensity along the height of the towers appears to better estimate the response of the transmission tower, in comparison with previous methods which assumed constant turbulence intensity. Dynamic amplification factors and gust effect factors were computed, and comparisons were made with code specific values. The resonance contribution is shown to reach a maximum of 18% and 30% of the peak response of the stand-alone tower and entire system, respectively.

• 한국건설관리학회논문집
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• 제8권1호
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• pp.47-56
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• 2007

우리나라의 민간투자사업은 잦은 제도 변경, 정부의 지원정책 변경 등으로 많은 혼란을 겪고 있는 실정이다. 특히 BTO 사업을 중심으로 진행되던 민간투자사업에 2005년부터 BTL 사업이 도입되면서 그 무게추가 BTL 사업으로 옮겨지고 있지만 아직 BTL 사업 전반에 대한 체계적인 연구는 부족한 현실이다. 이에 본 연구에서는 BTL 사업 중 실시협약이 이루어진 몇 개의 사업에 대하여 사업 전반에 내재된 리스크 인자들을 도출하고 각 인자의 중요도를 제시하고자 한다. 또한 중요도가 높은 리스크 인자에 대한 영향도 분석을 통하여 각 리스크 인자가 프로젝트에 미치는 영향의 정도를 추정하고자 하였다. 이는 BTL 사업의 계획, 시공, 운영 등 전반에 걸쳐 나타날 수 있는 리스크 인자들을 사전에 예측할 수 있도록 함은 물론 그 영향 정도를 사전에 인지할 수 있도록 함으로써 사업을 추진하는 이해관계자에게 많은 도움을 줄 수 있을 것으로 기대된다.

• 한국습지학회지
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• 제21권1호
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• pp.57-65
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• 2019

사회인프라 시설로 분류되는 LID(Low Impact Development) 시설은 지속적 유지 및 관리를 통하여 경관지속성과 기능지속성을 유지할 수 있다. LID 기법은 자연기반해법이기에 잡초, 폐기물 및 식생관리를 통하여 지속가능성을 확보할 수 있다. LID 시설은 도시에 분산적으로 설치되며 유지관리가 단순하기에 시민들의 참여를 통한 관리가 가능하다. 따라서 본 연구는 LID 시설의 현장조사를 통하여 LID 시설의 지속가능성에 영향을 주는 유지관리 인자를 도출하고 시민들의 참여도를 조사함으로써 유지관리에 대한 방안을 제시하고자 수행되었다. LID 시설의 경관지속성은 폐기물, 잡초관리가 중요한 인자로 도출되었으며, 기능지속성은 고사체 원인규명 및 관리와 적용토양과 식물종 선정이 중요한 인자로 도출되었다. 시민들은 LID 시설의 확대 및 관리, 조례제정 및 범국민 운동 참여 등에 대한 설문조사에서 모두 80% 이상의 높은 동의를 보였다. 일자리와 연계된 LID 관리 참여의향은 약 64%로 나타나 LID가 취약계층의 일자리가 될 수 있는 가능성을 보였다. LID의 유지관리는 비전문가도 쉽게 수행할 수 있기에 시설별 적은 비용으로 시민들의 참여를 유도할 수 있다. 시민들이 참여하는 유지관리 비용은 지자체의 LID 적용을 통해 저감된 사회인프라 관리비용과 정부의 사회복지 예산을 적용할 수 있을 것이다.

• 수산해양교육연구
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• 제27권2호
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• pp.566-575
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• 2015

The study aims to identify the generation and treatment of fishery by-products in Korea and suggests future directions and strategies for their eco-friendly utilization and industrialization. First, the study focuses on the identification of the generation and their treatment in Korea since merely few study were conducted and they did not provide enough information regarding the overall generation and treatment at the national level. According to the estimation, Korea generates 800 thousand to 1,200 thousand tones of fishery by-product every year. The fishery by-products generated at large seafood markets and processing facilities are used or processed as fish meal and feed, but those generated from households and small seafood restaurants are currently treated as food waste. In addition, inadequately treated fishery by-products cause various problems such as spoiling urban landscape, creating odor and incubating pest. After identifying the generation and treatment of fishery by-products, the study suggests directions for the formulation of infrastructure for transition into resource circulation society, minimization of dumped waste and their eco-friendly recycling as resources, diversification of recycled goods and development into a high-value added industry. Finally, the study suggests detailed strategies for the directions such as establishment of legal and institutional foundation, separation of fishery by-products from wastes, development of technology tailored for commercialization, introduction of pilot projects for industrialization and cultivation of social enterprises.

• 대한안전경영과학회지
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• 제6권1호
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• pp.125-133
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• 2004

Greeting the globalization and information period of 21C, the improvement of the distributional system structure and modernization of publishing distribution are the seriously required periodic assignments for the publishing industry that is a national knowledge and culture industry to be equipped with the core competitiveness. First, it is to found a large distributional organization that is able to provide total logistics services in time that is essential to the publishing company and bookstore. Second, it is to have a logistics service to act up to the variable requirements of customers such as publishing companies and bookstores under the rapidly changing distribution environment. Third, it is to provide the standardized information of publishing distribution. It is needed to establish a total distributional center in collaboration to satisfy the requirements of publishing industry as above. By doing this work, structure of the publishing distribution system can be improved and its constitution can be strengthen, and it is possible not only to construct a stable supply system but also to realize an information-based system in the publishing industry with the construction of information system and its utilization. Furthermore, the application of RFID in the publishing distribution is essentially required to provide the symbolic model and logistics infrastructure into the 'Paju publishing culture information industrial complex'. It could be possible by growing the international recognition regarding distribution environment and strengthening the international competitiveness in the period of the ""Open door".

• 대한안전경영과학회지
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• 제10권2호
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• pp.163-168
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• 2008

These days, international air-logistics demand is getting bigger and bigger by increasing in trading volumes of export and import of Asia. It makes the air logistics of stakeholder to invest in air logistics facilities and information systems for meeting the growth of air transportation. However there are some problems that the efficiency of investment is not good by duplicately investing in information systems and moreover not compatible with each other because the stakeholder is investing in individual information system and air logistics facilities instead of constructing the integrated infrastructure. In this paper, we investigated the export, import, and transshipment process of air logistics to simplify air logistics process through the RFID(Radio Frequency Identification) application and the 4PL system.

• 한국항해항만학회지
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• 제35권9호
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• pp.755-763
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• 2011

Recently, extreme tsunami waves generated by submarine earthquake have caused tremendous damages to the coastal cities and ports. Strong seiche oscillations and runups are observed in specific sea areas around the world. Although no frequent impacts to the coast of Korean peninsula, there exist some important events in the east of Korea in the past. This study focuses on two historical events and recalculate with different fault and rupture mechanism for prediction considering the recent trend of submarine earthquake. The present study of the 1983 Akita tsunamis demonstrates the multi-scale resonance along continental coasts. Together with the Nankai tsunami for inland sea, we have confirmed the inland sea resonance surrounded by islands in defining the impact along the coast. Coherence and wavelet analyses for deducing a predominant period and time frequency are useful in reasoning the inundation. The resonance modes, which are largely independent of the tsunami source, allow identification of at-risk communities and infrastructure for mitigation of tsunami hazards. Furthermore, understanding of the resonance and the predicted runups for the site of power plant and industrial complex in the east coast of Korea would allow better preparation for the future disasters.

• 수산경영론집
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• 제46권2호
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• pp.43-57
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• 2015

The study aims to identify the current status of aquaculture information in Korea and suggests policy directions for its integrated management. Firstly, the study focuses on the identification of the current status of aquaculture information by reviewing how aquaculture information is managed. Secondly, this study identifies problems such as lacks in necessary aquaculture information, inefficiency caused by dispersion and overlapping of information, absence of integrated management system and insufficient sharing of information. After identifying the current status of aquaculture information and its problems, the study suggests three basic directions to systematically integrate and manage the information such as establishment of infrastructure for promoting the integrated management of aquaculture information, generation and systematic management of useful aquaculture information and enhancement of user convenience. Finally, the study suggests detailed strategies such as establishment of a foundation to facilitate integrated management of aquaculture information, organization of organic network, sharing of more information, creation of necessary information through demand survey, creation of systematic management system, provision of a customized total service, and increase in education and PR activities on information use.

• 대한한방내과학회지
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• 제35권3호
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• pp.332-342
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• 2014

Objectives: This study was investigated in order to analyse the characteristics of recent Chinese medicine treatment of gastric cancer, and provide literature basis for the development of effective therapy of gastric cancer by reviewing Chinese journals. Methods: The literature on Chinese medicine treatment of gastric cancer were collected, analyzed and summarized from the China National Knowledge Infrastructure (CNKI) from 2000 to 2013. Results: Physicians have not shown consistent opinion with the pattern identification of gastric cancer. Recently, traditional Chinese Medicine patent prescriptions have been much used in the treatment of gastric cancer, which is classified into the reinforcement of healthy qi and elimination of the pathogenic factors. Chinese medicine combined with western medicine can improve the immune system and quality of life, while reducing toxic side effects. Conclusions: Further studies on traditional Chinese Medicine are needed to increase the survival rate of gastric cancer and effectiveness of combination therapy with western medicine.

• 대한안전경영과학회지
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• 제8권6호
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• pp.91-108
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• 2006

RFID/USN is important infrastructure of the ubiquitous society. And so, It is various and practical research is attempted. These two base technology have physical characteristic and complement relationship. Like this relationship is applied Following example that is system research which manages warehouse stocks and conditions. First, We adhere RFID Tag at the Pallet of the warehouse and do identification goods. And then, It grasps the environment state information of stocks with sensor module which has Zigbee wireless communication function. From like this process RFID Tag information and jop-control command of sensor node also it is exposed to air. Therefore, We control sensor node in USN/RFID environment through the mobile device. And system design for the security Apply of the process is main purpose of this paper's. We propose the condition and function of the mobile device to the secondary. And We define the relation of the sensor node with RFID to be arranged to a warehouse. Finally, This paper is designed to find a trade-off of the following viewpoints. First, We offer suitable sensor-control information to a actual manager. Second, We offer RFID tag security approach to control the action of the sensor. Third, It increases the survivability of sensor node form.