• 설비공학논문집
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• 제27권10호
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• pp.544-551
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• 2015

This study was conducted to determine the LCC of apartment complexes with district heating and a cogeneration system. For the purpose of analyzing LCC according to the size of the apartment complex, 500, 1,500, and 4,000-unit model apartments were selected. Analysis was performed on the design of the heating system and the life cycle cost including total construction cost, maintenance and operation cost for the duration of the project period (15 years). According to the calculated results, 1) The initial cost of the cogeneration system for 500, 1,500, and 4,000-unit apartments is higher than that of the district heating system by 20%, 13%, and 12%, respectively. 2) In the case of the cogeneration system, the payback period by electric generation was found to be 5.21, 4.92 and 4.47 years, and saving cost was calculated to be 29 billion won, 94 billion won and 262 billion won after the payback period for 500, 1,500, and 4,000-unit apartments, respectively. 3) The LCC values of the cogeneration system were 1.12, 1.07 and 1.06 times larger than those of the district system according to the size of the apartment complex. In this study, the district heating system was found to be more efficient than the cogeneration system in terms of LCC reduction. 4) District heating is affected by fuel bills, so energy efficiency should be improved through recovering waste heat (incineration heat, etc.). Also, district cooling should be provided according to heat use to keep the temperature high in winter and low in summer.

• 한국기후변화학회지
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• 제8권3호
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• pp.213-220
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• 2017

The purpose of this study is to analyze effects of Greenhouse Gas (GHG) emission reduction in district energy business mainly based on Combined Heat and Power (CHP) plants. Firstly this paper compares the actual carbon intensity of power production between conventional power plants and district energy plants. To allocate the GHG from CHP plants, two of different methods which were Alternative Generation Method and Power Bonus Method, have been investigated. The carbon intensity of power production in district energy plants ($0.43tonCO_2e/MWh$) was relatively lower than conventional gas-fired power plants ($0.52tonCO_2e/MWh$). Secondly we assessed the cost effectiveness of reduction by district energy sector compared to the other means using TIMES model method. We find that GHG marginal abatement cost of 'expand CHP' scenario (-$134/ton$CO_2$) is even below than renewable energy scenario such as photovoltaic power generation ($87/ton$CO_2$). Finally the GHG emission reduction potential was reviewed on the projected GHG emission emitted when the same amount of energy produced in combination of conventional power plants and individual boilers as substitution of district energy. It showed there were 10.1~41.8% of GHG emission reduction potential in district energy compared to the combination of conventional power plants and individual boilers.

• 한국빅데이터학회지
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• 제5권2호
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• pp.29-42
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• 2020

소상공인은 우리나라 서민경제의 중요한 부분을 담당하고 있으나, 과다경쟁, 수익성 악화, 생활밀착형 업종편중 등의 어려움에 직면하고 있다. 이를 위해, 정부는 소상공인을 위한 상권분석서비스를 제공하고 있다. 그러나 다양한 기관에서 제공받은 데이터는 표준화되지 않고, 제한된 데이터로 서비스의 구성에 한계가 있다. 본 논문에서는 데이터의 정합성 문제를 해결하고, 데이터 분석서비스 확장을 위해 설문정보와 상권정보를 연계하여 분석하는 방법을 제안한다. 제안하는 연계 방법은 상권정보와 설문정보를 업종과 영역을 기준으로 동일 영역 연계, 설문 정보의 개별업체 중심 연계, 설문정보의 작은 영역과 상권의 큰 영역 연계의 세 가지 방법이다. 연계된 상권정보와 설문정보는 다양한 방법으로 활용되거나 분석서비스를 확대할 수 있다. 본 논문은 기존 상권분석 서비스의 한계 를 설문정보로 극복할 수 있는 방법을 제안하여 소상공인에게 필요한 상권분석 서비스를 확대할 수 있는 기반을 마련하였다.

• 한국빅데이터학회지
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• 제5권2호
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• pp.171-186
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• 2020

우리나라의 영세 소상공인과 자영업자의 비중이 주요 선진국에 비해 과도하게 높고 빈번한 창업과 폐업이 반복되어 국가 경제에 막대한 피해를 초래하고 있다. 이러한 문제를 해결하기 위해 소상공인을 위한 다양한 연구가 진행 중이며, 정부는 소상공인을 위해 빅 데이터를 이용한 상권정보 분석 서비스를 제공하고 있다. 상권정보 분석 서비스 중 서울시에서 운영하는 우리마을가게 상권분석서비스는 소상공인 관련 빅 데이터 분석 서비스를 제공하기 위해 지속적인 서비스 개선을 진행하고 있다. 그러나 다양한 기관에서 제공받은 빅 데이터를 통합하여 서비스를 구축하였기 때문에 데이터 신뢰성의 한계, 데이터 분석의 한계, 서비스 구성의 한계가 존재한다. 이러한 한계를 극복하기 위해 본 논문에서는 빅 데이터 기반의 상권 서비스와 연계 분석이 가능한 위치기반 설문조사시스템을 제안한다. 제안된 설문조사시스템은 설문정보와 상권정보를 연계하여 빅 데이터 상권 분석 서비스를 확장할 수 기반을 마련하였다.

• Journal of Preventive Medicine and Public Health
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• 제22권2호
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• pp.189-196
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• 1989

In January 1988, district medical insurance plan was executed on a national scale in Korea. We conducted an evaluation of the impact of execution of district medical insurance plan on number of hospital patients: number of outpatients; and occupancy rate. This study was carried out by Box-Jenkins time series analysis. We tested the statistical significance with intervention component added to ARIMA model. Results of our time series analysis showed that district medical insurance plan had a significant effect on the number of outpatients and occupancy rate. Due to this plan the number of outpatients had increased by 925 patients every month which is equivalent to 8.3 percents of average monthly insurance outpatients in 1987, and occupancy rate had also increased by 0.12 which is equivalent to 16 percents of that in 1987.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전기설비전문위원
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• pp.12-14
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• 2008

부하가 밀집된 도심지의 배전전주는 고저압 배전선로용은 물론 주상변압기, 개폐기 등 배전기기의 설치를 위하여 필요불가결한 설비 중의 하나이다. 그러나 도심지에서는 미관저해 및 건물의 가치하락을 우려하는 민원으로 인하여 신규 건주에 어려움을 쥐고 있다. 본 연구에서는 이러한 문제점을 해결하고자 일반전주의 2배인 최대 6대의 주상변압기, 2대의 개폐기 및 특고압 인입설비를 설치할 수 있도록 2개의 상부 구조를 가지는 Y형 강관전주를 개발하였다.

• 한국주거학회논문집
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• 제14권3호
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• pp.137-146
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• 2003

The Primary Purpose of this study is to evaluate transportation conditions (including parking space shortage problem) of the old single house district and to derive some policy implications for living environment improvement policy. For these purposes, data were collected from field survey and questionaire survey. The main findings are follows. Residents are discontent about building structure, old house, high risk of traffic accident in the housing district and parking space shortage. The living environment of the old single house district is further degraded by mix of commercial and business functions in the residential area. Based on these findings, we suggest that the introduction of resident-first parking zones, restriction of use of facilities with more detail division of use than current zoning system for improvement of living environment.

• 자원ㆍ환경경제연구
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• 제10권3호
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• pp.367-386
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• 2001

In this paper we analyze the environmental advantages of district heating system. We construct three econometric models to analyze the energy consumption and economic cost as well as the emission of the major pollutants like $SO_x$, $NO_x$, DUST, and $CO_2$. As the size of heating supply is larger, the district heating system is evaluated to be better than other heating systems environmentally and costly in the long run. Especially, the district heating reduces $SO_x$ emission significantly when the size of heat production is large. But the advantages of district heating system are very sensitive to the fuel mix and heat source.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.273-274
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• 2001

This paper presents the effects on 154kV electrical power customers' productive activities by the instantaneous voltage sag or interruption in power system. According to the survey all respondents (8customers) experienced the breakdown of facilities when instantaneous voltage sag over about twenty percents of pre-fault occurred in power system.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.215-219
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• 2004

In this study, Types of irrigation water development in islands district were classified. The types were reservior, fleshwater lake, pumped storage, etc. Most of islands district has delveloped reuse irrigation system as a pumped storage system. But. Irrigation water-reuse ratio doesn't define a basis clearly and the value of measurement for water-reuse ratio doesn't exist so far. so, we measured Irrigation water-reuse to clarify for water-reuse ratio in a pumped storage system. Also, we need to develop hydrologic analysis and water balance method with characteristic factor of islands district. that make use of plan about security of agriculture water efficiently in islands district.