• Life and Agrochemicals
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• v.29 no.10
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• pp.21-30
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• 2008

한국농약과학회(회장 최운홍)와 한국작물보호협회(회장 염병만)가 고동 주최한 "2008한국농약과학회 추계 학술발표회 및 한국작물보호협회 창립 35주년 기념 심포지엄"이 관계 및 학계, 언론, 업계 관계자 등 400여명이 참석한 가운데 성황리 개최됐다. 지난 10월 9일부터 10일까지 이틀 동안 강원도 용평리조트내 그린피아콘도 그랜드볼룸에서 '애그플fp이션 시대 식량주권과 작물보호제 산업'이란 주제로 열린 이번 행사에서는 최근 의미가 모호한채 만능인 양 확산되어 가는 유기농업의 빛과 그림자를 조명하고, 애그플레이션 시대 세계열강들의 곡물 확보 전쟁 등으로 식량무기화는 가능성이 아니라 목전에 와 있는 현실임을 상기시켜 작물보호제의 중요성과 그 위상을 재정립하며 나아갈 방향을 확립하는 좋은 계기가 된 것으로 분석된다. 농약과학회 최운홍 회장은 개회사를 통해 "전 세계적으로 몰아닥치고 있는 곡물가격 상승과 식량위기는 식량확보의 중요성은 물론 기존 식량의 소중함을 다시 한번 일깨워 주고 우리농업을 새롭게 평가 조명할 수 있는 좋은 기회"라면서 "급변하는 세계 농업흐름 속에서 현실을 적시하고 농업생산의 중요한 축을 담당하고 있는 작물보호제의 중요성과 위상을 재정립 하며 나아갈 방향을 모색하는 의미 있는 행사가 되길 바란다"고 말했다. 한국작물보호협회 염병만 회장은 환영사를 통해 "지구촌은 지금 어느 누구도 소중한 먹을거리로부터 안심하지 못하고 있다"면서 "식량자급이 안정적으로 이루어지지 않는 한 작금의 일시적 풍요는 사상누각에 불과할 뿐"이라고 전제하고 "이제는 먹을거리의 진정한 위해요소가 무엇인지 가려낼 줄 알아야 하며 과학을 보는 소비자의 인식도 공평해져야 한다"고 강조했다. 이날 심포지엄에서는 일본 동경농업대학 Naoki Motoyama 교수의 '일본 유기농업의 허상과 실상'을 비롯, 모두 5편의 주제발표가 있었다. 주요 내용을 요약, 정리해 본다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.36 no.5
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• pp.903-913
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• 2016

Paris Agreement of Climate Change seem affect to Korea eco-policy. Meanwhile the eco-design for reduce carbon emission have been applied in design phase of construction. However eco-design have applied passively except the project of eco-building system. For reflect eco-component in design, design VE that be appling to basic design and executing design phase of all construction project of over 10 billion should be use. But present applying VE Job Plan is reflecting partly eco-component, so the effect is small. Therefor new eco-VE development that reflect eco-elements to exist VE need. As the result of this study, the concept of environmental cost is defined to accounting. The calculation of the cost was using methods that apply $CO_2$ emission trading price, WTP, carbon productivity concept and carbon tax based on $CO_2$ emission. However, in order to apply eco-friendly VE at design phase, the model of new concept included carbon productivity concept is necessary. The eco-friendly VE model of new concept is model using $CO_2$ emission and potential environmental pollution index (PEPI). This study tried define eco-value model and environmental cost definition that become the major axle of eco-VE.

• Journal of Korean Society of Transportation
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• v.19 no.6
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• pp.89-102
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• 2001

Using a multiproduct translog cost function model, this paper examines the existence or absence of scale and scope economies in Seoul's urban bus industry. The Paper then conceptualizes that the bus firm produces three outputs (city, seat and local bus-kilometers) using low input factors(labor, capital, fuel and maintenance). Using 1996 annual observations for 81 Seoul's bus firms, the equation system consisting of a cost function and three input share equations is estimated with the nonlinear iterative Zellner method. The findings show that the cost function corresponding to a non-homothetic production technology with separability between local bus outputs and inputs adequately represents the structure of cost for Seoul's bus firms, and that the demand lot all input factors is quite inelastic with respect to their own price. On the other hand, nearly all firms experience mild overall economies or scale, but rather marked product-specific economies of scale with respect to all the three outputs. In addition, there appear to be substantial economies or scope associated with the joint production of city and seat bus services, while considerable diseconomies of scope associated with that of city and local bus services. These results indicate that the merger of smaller firms into larger firms with a fleet of approximately 200 buses would result in more cost-efficient bus services.

• Journal of the Korean Geographical Society
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• v.28 no.4
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• pp.379-391
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• 1993

Present-day world economy is characterized by : technology nationalism, economic regionalism, market protectionism, multinational corporations, efc. All nations are striving for intensifying national economic rivalry and seeking after their own interests above everything else. Many regions of the world are also forming trading blocs, which could negatively affect nonmember states. The ultimate way to meet these difficulties is to establish production facilities in the countries imposing trade regulations. However, as the existing models of direct forrign investment (DFI) do not account for the particular nature of Korean firm's DFI activities, a new point of departure is imperative. It is because of this that Korean firms have only limited firm-specific advantages, the basic precondition of extant DFI theories, compared with their developed counterparts.

• The Journal of the Convergence on Culture Technology
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• v.5 no.3
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• pp.351-357
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• 2019

This research is automatic Wet Pipe Sprinkler System, dry pipe Sprinkler System, preaction Sprinkler system, vacuum Sprinkler system, deluge Sprinkler system, etc., key components of each Sprinkler system, verve valve, valve, etc. This is to simplify the various processes of the manufacturing process into a single process to create an environment in which a single machine can simultaneously produce a standardized product, thereby improving the price competitiveness of the product, reducing the cost of maintaining the product, and making it more adaptable to the new sprinkler system that is developed in the future. Automatic Wet Pipe Sprinkler System, desipe Sprinkler System, preaction sprinkler system, vacuum Sprinkler system, deluge Sprinkler system, both types of existing Sprinkler system, only replace the primary and secondary tubing valves.It has the advantage of being easy to apply to the lower system. Legal and institutional research is needed for the commercialization of the Sprinkler system applying the solenoid valve as a future project.

• Journal of Energy Engineering
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• v.25 no.1
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• pp.23-28
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• 2016

In spite of various merit of algae as biofuel, the production cost of algae is a considerable obstacle for commercialization. The concurrent development of essential technologies is needed for the cultivating, harvesting, extracting and energy transformation. The production cost of algae biofuel has still higher than that of the other commercial biofuel. The major research activity has been focused on the cultivating and the research of other processes has been done with relatively lower activity. It is difficult to separate the algae from water because of the similar magnitude of density each other. The agglomeration and extracting of algae with the hybrid technology using ultrasonic wave is rare effect of environmental hazard and also it is appropriate technology for the next generation energy resources. The present research is investigated for the effective separation of algae from water with the ultrasonics wave. The aim of the present research is focused on the establishment of optimal design of algae agglomeration system. For this purpose, the computational fluid dynamic analysis has been conducted in the flow field with ultrasonic wave and algae flow to clarify the mechanism of algae separation by ultrasonic wave.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.252-263
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• 2018

In this research, we performed a SWOT analysis to analyze the feasibility of cultivating tropical fruits in Korea, using the mango as a case study. The opportunities for domestic tropical fruit (mango) cultivation are that the domestic cultivation environment is improving due to global warming, the consumer market is expanding due to the increase in domestic demand, and some local governments are supporting the cultivation of tropical fruits as a new high-income crop. The strengths are that it is possible to produce high quality fresh fruits in Korea and that they are still distributed in small quantities, so they can be differentiated from imported ones. There are regular customers and the mango is recognized as a medicinally functional fruit. The threats are that the price competitiveness of imported goods is likely to be further strengthened due to the implementation of the FTA and that it is difficult to cope with the unpredictable climate changes, such as heavy snowfall and extremely cold weather. The weak points are that the initial investment cost is high, the operating costs such as heating bills are also very high, and there is no supply system for the chemicals, fertilizers and cultivation technology required for tropical fruits. In order for tropical fruits such as mangoes to become major fruits, we must make full use of these strengths and opportunities while, at the same time, complementing the weaknesses and eliminating the threats in the value chain.

• Journal of the Korean association of regional geographers
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• v.3 no.2
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• pp.151-162
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• 1997

Although modern versions of the traditional Von $Th{\ddot{u}}nen$ theory have contributed to a description of spatial organization in agriculture, they did not incorporate the market mechanism as an integral part of location theory. This deficiency has been indicated and new mathematical structure has been proposed elsewhere by the author. The closed model, which simultaneously considered a basic principle of supply and demand, exposed a computational complexity. Based on the problem, this study attempts to extend market mechanism in order to consider the influence of city (market) size in agricultural location theory. To theoretically explore the economic relationship in a location theory, this study simplifies agricultural activity as just two activities in one-dimensional spatial economy. The problem has been solved by equating total supply and demand of agricultural products, and then by determining each agricultural price from the relationship. All of the mathematical problems have been arranged in matrix form. First, the traditional model and closed model have been compared by quantitative comparative statics which provides the sensitivity test for each model. The results have shown that the traditional model shows a relatively excessive change in land use, besides the deficiency of a constant agricultural price. Second, the effects of the size of market town and its population increase were examined, using the closed model. In this case, the price of agricultural product is increased, and the land use is extended outward. This proves that locational rent is related to the expansion of land use. Third, environmental uncertainty was associated with the closed model, in order to further consider the difference of farmers attitude in strategic perspective. In this study, two extreme attitudes, which reflects the maximum average expected returns and the maximum guaranteed returns, were examined in their land use and their effects on the prices of agricultural products. It was shown that the two farmers attitudes can be interconnected with location theory. Due to the exogenous data, the differences in the area of land use and total quantities of agricultural products were not clearly shown in this study. However, it was shown that the land use pattern is very different. That is, maximum guaranteed return model reveals a mixed land use pattern around the market town. Basically, this study shows some spatial and economic implications related to Von $Th{\ddot{u}}nen$ model.

• Journal of the Korea Institute of Building Construction
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• v.9 no.6
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• pp.183-188
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• 2009

HwaSeong (Suwon Fortress) was built during the reign of King Jeong-jo in the Choseon Dynasty. Detailed information on the construction of HwaSeong can be found in Hwaseong Seongyeok Euigui. In this sense, it is necessary to perform a comparative analysis on the Hwaseong Seongyeok Euigui based on construction management factors. This paper aims to analyze the HwaSeong construction project from a modern construction perspective by comparing and reviewing information related to the procurement of construction materials of the time. For this, wooden and steel materials and tiles were analyzed by supply area, supply channel, type and price. From the results of the analysis, it is found that the government used both private and official channels to supply materials. In particular, except for wooden materials that could be supplied from Bongsan, the supply of materials showed a high dependency on private channels. In terms of steel, it was almost 30 percent cheaper through private channels than when purchased through the official channel. Finally, materials vulnerable to damage like tiles were manufactured from the areas near the construction site. From this fact it can be interpreted that the government had a flexible procurement system, including manufacturing on the spot and external suppliers,depending on the property of the material. It is expected these analytical results will serve as key data to understand the management factors in constructing HwaSeong.

• Journal of Energy Engineering
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• v.26 no.4
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• pp.67-73
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• 2017

For the bio-fuel conversion of algae, several processes are needed including cultivating, agglomeration, extracting and conversion to the bio-fuel. The production cost for each process makes the total production cost of algae bio-fuel conversion. The production cost of algae bio-fuel has still higher than that of the other commercial bio-fuel. The reduction of production cost for each process enables the competitive price as a bio-fuel. It is difficult to separate the algae from water because of the similar magnitude of density each other. The agglomeration and extracting of algae using ultrasonic wave is rare effect of environmental hazard and also it is appropriate technology for the next generation energy resources. The present research is investigated for the elucidation of algae behavior in the water with the ultrasonics wave. For this purpose, the unsteady computational fluid dynamic analysis has been conducted in the ultrasonic pressure field. The velocity, pressure and algae concentration changes with time have been analysed to clarify the mechanism of algae separation by ultrasonic wave.