• Structural Engineering and Mechanics
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• 제46권6호
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• pp.827-842
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• 2013

In this paper, the wave propagation in generalized thermo elastic plate immersed in fluid is studied based on the Lord-Shulman (LS) and Green-Lindsay (GL) generalized two dimensional theory of thermo elasticity. Two displacement potential functions are introduced to uncouple the equations of motion. The frequency equations that include the interaction between the plate and fluid are obtained by the perfect-slip boundary conditions using the Bessel function solutions. The numerical calculations are carried out for the material Zinc and the computed non-dimensional frequency, phase velocity and attenuation coefficient are plotted as the dispersion curves for the plate with thermally insulated and isothermal boundaries. The wave characteristics are found to be more stable and realistic in the presence of thermal relaxation times and the fluid interaction.

• Journal of Preventive Medicine and Public Health
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• 제42권2호
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• pp.73-81
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• 2009

Objectives : This study presents a scientific basis for the establishment of an environmental health contingency plan for dealing with accidental coastal oil spills and suggests some strategies for use in an environmental health emergency. Methods : We reviewed the existing literature, and analyzed the various fundamental factors involved in response strategies for oil spill. Our analysis included data derived from Hebei Spirit oil spill and used air dispersion modeling. Results : Spill amounts of more than 1,000 kl can affect the health of residents along the coast, especially those who belong to vulnerable groups. Almost 30% of South Korean population lives in the vicinity of the coast. The area that is at the highest risk for a spill and that has the greatest number of people at risk is the stretch of coastline from Busan to Tongyeong. The most prevalent types of oil spilt in Korean waters have been crude oil and bunker-C oil, both of which have relatively high specific gravity and contain volatile organic compounds, polycyclic aromatic hydrocarbons, and metals. In the case of a spill of more than 1,000 kl, it may be necessary to evacuate vulnerable and sensitive groups. Conclusions : The government should establish environmental health planning that considers the spill amount, the types of oil, and the distance between the spot of the accident and the coast, and should assemble a response team that includes environmental health specialists to prepare for the future oil spill.

• 수산경영론집
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• 제30권1호
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• pp.31-50
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• 1999

The purpose of this paper is to offer policies or laws governing the future of Korean seafood markets in view of societal marketing concept. The environment surrounding those markets is changing quickly and constantly. The proposals in this paper are meant to help the Korean seafood market coping with this swiftly changing environment. This paper sorts this changing environment in terms of institutional side and secio-economical side. The institutional side involves the enforcement of international and domestic seafood trade standards, the increase of seafood importation, the adoption of optional seafood sales system, the openness of distribution market, and the adoption of TAC system. The secio-economical side involves the development of telecommunication and transportation, and the changing of seafood consumption pattern. The forecast about the future of seafood market could be classified into three fields, that is, the production field, the distribution field, and the consumption field of seafood. In the production field of seafood, the stabilization of supply of seafood and the production management oriented seafood market could be forecasted. In the distribution field, the formulating of enforced trade standards, the dispersion of marketing function among fisher, wholesaler and retailer, the development of marketing skills, and the promotion of marketing information system could be forecasted. Finally, in consumption field, the promotion of standardization and diversification, the appearance of intellectual consumers could be forecasted. This paper seeks to offer policies or laws fur the three categories of the seafood market-the government, the fisher, and the distributor-coping with the changing environment on the above three fields, thereby benefiting the consumer's long-term welfare. For the government, this paper suggests the construction of a Seafood Transaction Information Infrastructure, a Seafood Dealer License System, and a Seafood Safety Security System. For the fishers, this paper proposes an Eco-labelling System, a Sustainable Production System, and a Real Naming System in dealing seafood. Finally, for the distributors, this paper offers a Seafood Production Controlling System, a Nature-friendly Marketing System, and a Consumer-oriented Marketing System.

• 농업과학연구
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• 제26권2호
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• pp.77-93
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• 1999

This study is aiming at identifying the foreward and backward lingkage effects of the farm land base development project. Korean Government has continuously carried out farmland base development projets including the integrated agricultural development projects. large and medium scale irrigation projects and the comprehensive development of the four big river basin including tidal land reclamation and estuary dam construction for the all weather farming since 1962. the starting year of the five year economic development plans. Consequently the irrigation rate of paddy fields in Korea reached to 75% in 1998 and to escalate the irrigation rate, the Government had procured heavy investment fund from IBRD. IMF and OECF etc. To cope with the agricultural problems like trade liberalization in accordance with WTO policy, the government has tried to solve such problems as new farmland base development policy, preservation of the farmland and expansion of farmland to meet self-sufficiency of foods in the future. Especially, farmland base development projects have been challanged to environmental and ecological problems in evaluating economic benefits and costs where the value of non-market goods have not been included in those. Up to data, in evaluating benefits and costs of the projects, farmland base development projects have been confined to direct incremental value of farm products and it's related costs. Therefore the projects'efficiency as a decision making criteria has shown the low level of economic efficiencies. In estimating economic efficiencies including Leontiefs input-output analysis of the projects could not be founded in Korea at present. Accordingly this study is aimed at achieving and identifying the following objectives. (1) To identify the problems related to the financial supports of the Government in implementing the proposed projects. (2) To estimated backward and foreward linkage effects of the proposed project from the view point of national economy as a whole. To achieve the objectives, Hwangrak benefited area with reservoir which is located in Seosan-haemi Disticts, Chungnam Province were selected as a case study. The main results of the study are summarized as follows : a. The present value of investment and O & M cost were amounted to 3,510million won and the present value of the value added in related industries was estimated at 5.913million won for the period of economic life of 70 years. b. The total discounted value of farm products in the concerned industries derived by the project was estimated at 10,495million won and the foreward and backward linkage effects of the project were amounted to 6,760 and 5,126million won respectively. c. The total number of employment opportunities derived from the related industries for the period of project life were 3,136 man/year. d. Farmland base development projects were showed that the backward linkage effects estimated by index of the sensitivity dispersion were larger than the forward linkage effect estimated by index of the power of dispersion. On the other hand, the forward linkage effect of rice production value during project life was larger than the backward linkage effect e. The rate of creation of new job opportunity by means of implementing civil engineering works were shown high in itself rather than any other fields. and the linkage effects of production of the project investment were mainly derived from the metal and non-metal fields. f. According to the industrial linkage effect analysis, farmland base development projects were identified economically feasible from the view point of national economy as a whole even though the economic efficiencies of the project was outstandingly decreased owing to delaying construction period and increasing project costs.

• 융합경영연구
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• 제11권6호
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• pp.35-41
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• 2023

Purpose: This study aims to determine the marketability of the heritage sites in Region III, Philippines. More specifically, it will obtain information on the: (a) profile of the heritage sites in Central Luzon; (b) dimensional issues of their marketability along social, environmental, and economic lines; (c) quality of services in terms of tangibility, responsiveness, empathy, assurance, and reliability; and (d) its business model canvas. Research design, data, and methodology: This will utilize a descriptive survey of the heritage sites in Central Luzon, namely: Aurora, Nueva Ecija, Bulacan, Pampanga, Tarlac, Zambales, and Bataan. There will be 60 respondents, including 5 facilitators, 24 residents, and 31 tourists. The results will be statistically measured through the measures of central tendencies, dispersion, and the test of significance. Result and conclusion: This study will comprehensively examine the local tourism sector, benefiting various stakeholders. It serves as a valuable resource for tourists by providing insights into destination marketing strategies and enhancing heritage tourism experiences. Administrators benefit from coping strategy evaluations, aiding in the formulation of effective strategies aligned with industry goals. Tourism businesses align with industry objectives and the study streamlines ordinances for site protection for local government units. Additionally, the community gains empowerment through insights into employable activities and potential businesses, influencing assessments of the justification for local preservation ordinances.

• 생태와환경
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• 제50권4호
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• pp.374-380
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• 2017

Pine wilt disease (PWD) is one of the hazardous pine tree diseases in whole world. In Korea, PWD has been spreading since it was first observed in Busan in 1988. Dispersion of PWD is mainly mediated by its vectors such as Japanese pine sawyer. In this study, we characterized environmental condition including meteorological factors, geographical factors, and land use factors influencing on the occurrence of PWD. The occurrence data of PWD were collected at 153 sites where were the initial occurrence sites of PWD in local government regions such as city, Gun, or Gu scale. We used Akaike Information Criterion (AIC) to evaluate the relative importance of environmental variables on the discrimination of occurrence or absence of PWD. The results showed that altitude, slope, and distance to road were the most influential factors on the occurrence of PWD, followed by distance to building. Finally, our study presented that human activities highly influenced on the long term dispersal of PWD.

• 한국안전학회지
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• 제31권1호
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• pp.111-117
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• 2016

Natural disasters can cause major accidents in chemical facilities where they can lead to the release of hazardous materials which in turn can result in fires, explosions or toxic dispersion. Technological disasters triggered by natural disasters are referred to as NaTech(Natural Disaster Triggered Technological Disaster). These trends increase the probability of catastrophic future disasters and the potential for mass human exposure to hazardous materials released during disasters. In the present study, we proposed some methods for effective disaster management by conducting case study of major NaTech. First, establishing information sharing system of chemical accident for stakeholders and improving disaster manuals and standards of central and local government and co-operation support system. Second, activating information service of emergency planning and community right to know. Third, improving the integrated chemical accident database including NaTech accidents.

• 대한수의학회지
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• 제37권1호
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• pp.213-220
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• 1997

A simple and rapid method known as matrix solid phase dispersion(MSPD) for simultaneous determination of 11 pesticide(2,4,5,6-tetrachlor m-xylene, ${\alpha}$-BHC, ${\gamma}$-BHC, ${\delta}$-BHC, aldrin, chlorfulazuron, heptachloroepoxide, dieldrine, endrin, endosulfan sulfate, and tetradifon) in beef fat was estabilished. Beef fat(0.5g) was fortified by adding the 11 pesticides and dibutylchlorendate as internal standard, and blended with 2g bulk $C_{18}$ in pestle and motar. Pesticides were eluted from an extraction column composed of $C_{18}$/ fat matrix blend and 2g activated Florisil by addition of 8ml acetonitrile. Then $2{\mu}l$ portion of the acetonitrile elute was directly analyzed by gaschromatography with electron capture detection. Unfortified blank control were treated similarly. Recovery rate were ranged from $83{\pm}5.4%$ to $94.2{\pm}7.6%$, intra-assay variability and inter-assay variability were ranged from 2.3% to 7.4%(n=5 for each insecticides) and from $6{\pm}1%$ to $12{\pm}3%$(n=10 for each insecticides), respectively. These results indicated that the MSPD methodology is aceptable for the extraction, determination and screening of residues 11 chroniated pesticides in beef fat.

• 한국지리정보학회지
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• 제18권4호
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• pp.43-58
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• 2015

급격한 경제 성장과 인구 증가는 온실가스 배출량을 급증시키고 있으며 이는 기후변화를 가속화시키고 있다. IPCC(Intergovernmental Panel on Climate Change) 보고서는 온실가스가 2000년부터 2030년까지 최대 90%까지 증가할 것이라고 보고하고 있다. 이에 전 세계에서는 기후변화에 대한 피해를 줄이기 위해 기후변화 적응과 완화 대책 수립이 중요시되고 있으며, 우리나라에는 기후변화 대응 정책으로'저탄소 녹색성장(Low Carbon Green Growth)'을 시행하였다. 지자체에서는 친환경적이며 지속가능한 발전을 위한 도시계획을 조성하기 위해 다양한 연구를 수행해왔다. 특히, 기후변화에 가장 크게 영향을 줄 수 있는 토지이용변화에 대한 연구가 활발하게 수행되어지고 있는 실정이다. 본 연구에서는 제주도를 대상으로 경제적, 지리적 특성을 기반한 토지이용 균형 모델을 적용하여 주거 토지이용변화와 인구 밀도를 예측하였다. 먼저, 주거부분의 토지이용변화를 보기 위해, 3가지 유형의 시나리오를 구축하였다. 시나리오는 현재와 동일한 환경을 갖는 Dispersion 시나리오, 기후변화 적응 대책을 반영한 Adaptation 시나리오, 기후변화 적응과 완화 대책을 동시에 반영한 Combined 시나리오이다. 그 결과, 전반적으로 Dispersion 시나리오에서 Combined 시나리오로 갈수록 주거면적과 인구밀도가 줄어들었다. 이후 주거면적과 인구밀도 결과를 통해 시나리오별 주거용 에너지 소비량과 예상 인명 피해액을 산정하였다. 그 결과, 전반적으로 Dispersion 시나리오에서 Combined 시나리오로 갈수록 에너지 소비량과 예상 인명 피해액은 줄어들었다. 본 연구에서 제시한 토지이용균형모델을 적용하여 시나리오별 주거부분 토지이용과 인구 밀도 변화 파악은 향후 기후변화 안정성을 확보하고 완화할 수 있는 환경적 도시계획을 수립하는데 도움을 줄 수 있을 것으로 기대된다.

• 방사성폐기물학회지
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• 제20권1호
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• pp.99-110
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• 2022

In decommissioning a nuclear power plant, numerous concrete structures need to be demolished and decontaminated. Although concrete decontamination technologies have been developed globally, concrete cutting remains problematic due to the secondary waste production and dispersion risk from concrete scabbling. To minimize workers' radiation exposure and secondary waste in dismantling and decontaminating concrete structures, the following conceptual designs were developed. A micro-blast type scabbling technology using explosive materials and a multi-dimensional contamination measurement and artificial intelligence (AI) mapping technology capable of identifying the contamination status of concrete surfaces. Trials revealed that this technology has several merits, including nuclide identification of more than 5 nuclides, radioactivity measurement capability of 0.1-10⁷ Bq·g^-1, 1.5 kg robot weight for easy handling, 10 cm robot self-running capability, 100% detonator performance, decontamination factor (DF) of 100 and 8,000 cm²·hr^-1 decontamination speed, better than that of TWI (7,500 cm²·hr^-1). Hence, the micro-blast type scabbling technology is a suitable method for concrete decontamination. As the Korean explosives industry is well developed and robot and mapping systems are supported by government research and development, this scabbling technology can efficiently aid the Korean decommissioning industry.