• Korean Chemical Engineering Research
• /
• v.53 no.2
• /
• pp.156-163
• /
• 2015

This paper presents a new framework for design and economic evaluation of wind energy-based electricity supply system. We propose a network optimization (mixed-integer linear programming) model to design the underlying energy supply system. In this model we include practical constraints such as land limitations of onshore wind farms and different costs of offshore wind farms to minimize the total annual cost. Based upon the model, we also analyze the sensitivity of the total annual cost on the change of key parameters such as available land for offshore wind farms, required area of a wind turbine and the unit price of wind turbines. We illustrate the applicability of the suggested model by applying to the problem of design of a wind turbines-based electricity supply problem in Jeju. As a result of this study, we identified the major cost-drivers and the regional cost distribution of the proposed system. We also comparatively analyzed the economic performance of on/off shore wind farms in wind energy-based electricity supply system of Jeju.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.22 no.5
• /
• pp.543-553
• /
• 2021

As a key policy for achieving the goal of reducing GHG in the building sector, Korea has enforced the mandatory certification of zero-energy buildings for new buildings in the public sector from 2020. This study evaluated a policy to achieve Net Zero by identifying the trend of changes in building energy performance according to policy and presenting a methodology to analyze the current performance state of energy technology applied to buildings. The final goal was to help stakeholders apply appropriate energy technologies for new buildings. For this study, data collected on building energy efficiency certification over the last four years have shown a gradual increase in energy performance. In addition, K-means cluster analysis was used to analyze the performance status of energy technologies applied to buildings. The high and low clusters of education and office facilities were used to analyze the comparative group (2016-2020, 2020). As a result, the solar module area in both high and low clusters of education facilities increased by 261.1% and 283.5%. In contrast, the solar module area decreased by both high and low clusters of office facilities. The most passive and active technologies showed an increase in energy performance.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.11
• /
• pp.5163-5168
• /
• 2012

The aim of this study is to develop the supply-demand model(dynamic recursive simulation model) on the Hallabong tangor. In order to analyze the effects of alternative policy scenarios on the Hallabong tangor sector. Simulation runs were experimented for the period, 2011~2021, with three different scenarios. The major simulation results are as follows. The results of baseline show that in the year, 2021, acreage, production, price received by farm would be 2,051.5ha, 62,049.1 ton, 2,537.4 won per kg respectively. The results of scenario I (shipping control scenario) show that in the year, 2021, acreage, production, price received by farm would be 2,079.4ha, 62,984.9 ton, 2,836.3 won per kg respectively. The results of scenario II(the rate of economic growth 3.5%) show that in the year, 2021, acreage, production, price received by farm would be 2,039.5ha, 61,647.5 ton, 2,417.3 won per kg respectively. Finally, The results of scenario III(Survey of experts) show that in the year, 2021, acreage, production, price received by farm would be 2,053.7ha, 62,124.4 ton, 2,574.8 won per kg respectively. Therefore, economic recession can be a negative role in the industrial growth and price of Halabong tangor, but expansion of Hallabong tagor's export and processing can be a very positive role in the industrial growth and price of Halabong tangor.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.8
• /
• pp.392-402
• /
• 2018

Citrus fruits can be classified as field citrus, greenhouse citrus, citrus produced by rain proof cultivation and late-harvested citrus such as Hallabong, Chunhaehyang, and Jinjihyang according to cultivation method or variety in Jeju province of Korea. The consumption of late-harvested citrus has been increasing steadily since 1990 because the sugar content of the fruits is ordinary higher than field citrus. The cultivation land of citrus produced by rain proof cultivation has been also enlarged continuously aided by Korean government support program and quality increasing effect of this cultivation method. However, the cultivation land of field citrus has been decreasing since 2010. In spite of such a decrease of cultivation land, recently the price of field citrus rather declined according to increasing of yield per 10a. For the estimation and forecast of the long-term supply-demand model in the field citrus, we constructed a partial balance model for the individual field citrus and estimated individual equation in each item's model by using the econometric method. As a result of the production storage scenario analysis, the cultivation area is expected to store 5%(14.49ha), 10%(14.97ha). 15%(15.50ha) of citrus production in 2027. This study reviews the structure of storage, and storability in Jeju field citrus and suggest several policy implications.

• Journal of Korean Society of Forest Science
• /
• v.102 no.4
• /
• pp.491-498
• /
• 2013

Preliminary feasibility of REDD mechanism to combat forest degradation in North Korea is reviewed as a means of cooperation between South Korea and North Korea. North Korea has not established a national REDD+ strategy and a forest monitoring system which are required to implement REDD+ under the United Nations Framework Convention on Climate Change. Credible statistical data of forest resources is a necessary condition for implementing REDD mechanism in the developing countries. However, other than forest area data using satellite images, statistical data of forest resources of North Korea are mostly estimated based on simple hypothesis rather than transparent and robust results from national forest inventory. The review of statistical data of forest resources of North Korea shows that North Korea is in a pre-stage of REDD readiness. The study suggests that following research and cooperation agendas should be considered to implement REDD mechanism in North Korea: 1) detecting land use change since 2000, measuring carbon stock change, and identifying causes of deforestation and forest degradation; and 2) establishing a national REDD+ strategy' and a national forest inventory system in North Korea.

• Journal of Korea Water Resources Association
• /
• v.45 no.10
• /
• pp.1009-1022
• /
• 2012

This study approach the conflict in the process of promoting Dam construction plan from a hydrological method and comprehend the cause of conflict on conservation and flood collect all interested parties direct involvement and develop Shared Vision Model (SVM) to plan simulation and result. We forecast water for living, industrial water and agricultural water in each administrative district on conservation and simulate promptly in case that each structural alternative is formed and suggest water level deduction effect and change of area on watted surface and damage and organize the system to draw and agreement through exchanging mutual opinion. Also, it considered to contribute meditation and soften of conflict by securing accuracy of releasing information and trust of the result.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.29 no.3D
• /
• pp.357-362
• /
• 2009

The Investment to road projects has been a hot issue in the aspect of its possible overlapping or overinvestment in Korea. Therefore, additional road construction is not always accepted in these days. This paper investigated several indices including the country index and the road-extension rate index as well as a newly developed index for identifying and comparing road stocks among the OECD countries. Furthermore, the study has estimated some reasonable amount of additional road stocks of Korea when its GDP becomes twenty thousands per capita to forty thousands per capita in future by comparing the amount of stacks of OECD countries at those times. The result can be used for setting the target of road stocks in practical manner in the absence of the universally accepted theory in the road stock provision arena.

• Korean Journal of Soil Science and Fertilizer
• /
• v.45 no.5
• /
• pp.842-847
• /
• 2012

This study was conducted to estimate the greenhouse gas emissions on local government levels from 1990 to 2010 using 2006 IPCC guideline methodology. To calculate greenhouse gas emissions based on the 16 local governments, emission factor and scaling factor were used with default value and activity data came from the food, agricultural, forestry and fisheries statistical yearbook of MIFAFF (Ministry for Food, Agriculture, Forestry, and Fisheries). The total emissions in crop sector gradually decreased from 1990 to 2010 due to a decline in agricultural land and nitrogen fertilizer usage. The annual average emission of greenhouse gas was the highest in Jeonnam (JN) with 1,698 Gg $CO_2$-eq and following Chungnam (CN), Gyungbuk (GB), Jeonbuk (JB) and Gyunggi (GG). The sum of top-six locals emission had occupied 83.4% of the total emission in cropland sector. The annual average emissions in 1990 by applying 2006 IPCC guideline were approximately 43% less than the national greenhouse gas inventory by 1996 IPCC guideline. Jeonnam (JN) province occupied also the highest results of greenhouse gas emission estimated by gas types (methane, nitrous oxide and carbon dioxide) and emission sources such as rice cultivation, agricultural soil, field burning of crop residue and urea fertilizer.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.11a
• /
• pp.281-281
• /
• 2008

최근 높은 비표면적, 우수한 결정성, 나노스케일의 크기 등 다양한 물리 화학적 특성을 지닌 1차원 나노구조체를 이용한 가스센서 연구가 활발히 진행되고 있다. 가스센서는 네트워크 된 나노선들 이용하여 벌크, 박막 보다 극대화된 비표면적으로 가스 감도와 반응 속도를 향상시킬 수 있었다. 촉매 첨가를 위해 Acetylacetone 용액 7 ml에 10 mM이 되도록 Pt 분말을 첨가하여 촉매용액을 제조하였다. 마이크로피펫을 이용하여 미량을 센서의 감응체 부문에 뿌려 대기 중에서 건조한 후 센서의 감도를 측정하였다. 측정은 $250^{\circ}C$에서 일산화탄소 가스 500 ppm의 가스농도로 촉정하였을 때 촉매가 첨가된 센서가 70% 이상의 개선된 감도를 나타내었다. 이는 나노선에 분산된 촉매에 주입되는 가스가 흡착되고 다시 표면의 산소와 반응하여 전기전도도를 변화시키는 것으로 보인다. 첨가된 촉매에 대한 영향을 분석하기 위해 AES, XRD, FT-IR, TEM 등의 분석을 실시하였다.

• Journal of The Korea Institute of Healthcare Architecture
• /
• v.11 no.3
• /
• pp.19-30
• /
• 2005

As the population of the elderly increases drastically year by year in Korea, the more welfare centers for them are greatly needed. There are, however, a small number of public geriatric hospitals currently available. And a limited number of private-founded geriatric centers are under construction throughout the country. And the systematic standards for the spacial composition and departmental area distribution for them are not satisfactorily set up yet. The analytical study of the space composition and area distribution of the hospitals in question shows that publicly-shared spaces, such as day-room and lobby, are much more useful for their communications than private spaces, such as shut-in living rooms. It also shows that in-yards or in-gardens which are located in the center of the wards are very helpful for their comfortable long-term hospitalization. The shared spaces are recommended to be in sight of and within earshot of their caretakers. In relation with out-patient departments, the programs for the local elderly residents, such as the day-care center and recreation facilities are recommended to be prepared for their physical care and emotional treatment at a time by municipal welfare centers rather than by private institutions. The analytic study carried out in terms of departmental area distributions reveals that the areas for the wards are generally wider and areas for out-patient/or diagnosis departments are relatively narrower than those in the general hospitals. These area distributions seem to have come from the considerations of their relatively long-term staying in the centers than general hospitals and their mental stability as well.