지역난방 열배관망 운영데이터 기반의 파손확률 모델 개발

김형석 ( Hyoung Seok Kim ),김계범 ( Gye Beom Kim ),김래현 ( Lae Hyun Kim ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.3

District heating was first introduced in Korea in 1985. As the service life of the underground thermal piping network has increased for more than 30 years, the maintenance of the underground thermal pipe has become an important issue. A variety of complex technologies are required for periodic inspection and operation management for the maintenance of the aged thermal piping network. Especially, it is required to develop a model that can be used for decision making in order to derive optimal maintenance and replacement point from the economic viewpoint in the field. In this study, the analysis was carried out based on the repair history and accident data at the operation of the thermal pipe network of five districts in the Korea District Heating Corporation. A failure probability model was developed by introducing statistical techniques of qualitative analysis and binomial logistic regression analysis. As a result of qualitative analysis of maintenance history and accident data, the most important cause of pipeline damage was construction erosion, corrosion of pipe and bad material accounted for about 82%. In the statistical model analysis, by setting the separation point of the classification to 0.25, the accuracy of the thermal pipe breakage and non-breakage classification improved to 73.5%. In order to establish the failure probability model, the fitness of the model was verified through the Hosmer and Lemeshow test, the independent test of the independent variables, and the Chi-Square test of the model. According to the results of analysis of the risk of thermal pipe network damage, the highest probability of failure was analyzed as the thermal pipeline constructed by the F construction company in the reducer pipe of less than 250mm, which is more than 10 years on the Seoul area motorway in winter. The results of this study can be used to prioritize maintenance, preventive inspection, and replacement of thermal piping systems. In addition, it will be possible to reduce the frequency of thermal pipeline damage and to use it more aggressively to manage thermal piping network by establishing and coping with accident prevention plan in advance such as inspection and maintenance.

서울 지역난방 시스템의 4세대 저온지역난방으로의 전환

곽현주(Hyun Ju Kwag),송형운(Hyoung Woon Song),윤성필(Sung Pill Yun),한승호(Seung Ho Han) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.12

지역난방 네트워크는 지역 사회와 도시의 여러 수요자에게 열을 공급하기 위해 설계된다. 그리고 지역난방 네트워크는 현재 저온 열 분배 네트워크(저온 지역난방: LTDH)에 기반을 둔 4세대 지역난방(4GDH) 시스템이라 불리는 개념으로 발전해 나가고 있다. LTDH 시스템은 네트워크 열 손실 감소, 열공급과 수요의 균형 개선, 분배 열손실 저감, 폐열 및 신재생 에너지 활용에 이점이 있다. 뿐만 아니라 저온 DH는 시스템의 저장된 열을 효율적으로 활용할 수 있다. 이에 본 연구에서는 유럽국가의 LTDH로의 전환 사례를 선별 분석하였으며, 분석 결과를 바탕으로 S사의 LTDH로의 시스템 전환의 잠재적 가능성를 파악하였다. 연구 결과 100°C에서 90°C로 60°C에서 50°C로 각각 공급과 회수온도를 감축하면 분배 네트워크 열손실을 17% 줄일 수 있으며, 4GDH 수준의 공급/회수 온도감축(70°C/40°C)은 분배 네트워크의 연간 열손실을 56% 줄일 수 있다. District heating (DH) networks are designed to supply heat to various citizens at the community and city level. Currently, these DH networks are being revamped using a concept called the fourth generation district heating system (4GDH) which is based on a low temperature heat distribution (LTDH) network. The LTDH systems can introduce advantages, such as, reduced network heat losses, improved quality match between the heat supply and heat demand, reduced wastage and increased utilization of renewable energy. In addition, the lower temperature level of the DH network will usher in further possibilities for efficient utilization of heat storage units in the system. In this study, a selected example of the transition from a DH network to an LTDH system in European countries was analyzed. Based on the results of this analysis, the potential for transitioning the S corporation’s DH system to an LTDH system was explored. These results showed that there was a reduction in the supply and the return temperature of the DH system from 100°C to 90°C and from 60°C to 50°C which could potentially decrease the heat losses in the distribution network by around 17%. If the temperature reduction reaches the level of a 4GDH system (70°C/40°C), the annual heat losses in the distribution networks could be reduced by approximately 56%.

지역적 통혼권 연구의 비판적 검토 -행정구역별 분석의 문제점-

이창기 영남대학교 민족문화연구소 2008 민족문화논총 Vol.40 No.-

This paper intends to identify some shortcomings in the traditional methods of studying zone of marriage networks which have used administrative districts as the unit of analysis. In so doing, it also tries to propose a new method of analysis and some principles in our research. It is difficult to determine objectively the spatial range of marriage if we rely on administrative districts as the only analytical unit in our study. In the previous research, for example, when people living in the borderland between two different myon(townships) or do(provinces) marry people from adjacent villages that officially belong to different myon or do, the researchers have regarded their marriages as instances of a regional (myon-or do-level) exogamy. Many such problems in the research method are found in most of the previous field survey reports. In this regard, the author proposes some rules that we can follow in our future research on zone of marriage networks as follows: 1. We need to go into details of the spatial arrangement of marriages by subdividing the current areal unit of analysis into myon-level areas. 2. The concept of ‘zone of life’ or ‘sphere of everyday life’ is suggested for our study as an objective criterion on which we judge the spatial distances of areal marriage. The life zone here can be equated with the vicinity of a regular local fair, or the area where most of its residents go to the same market. It is almost equivalent to the traditional administrative area called hyon. 3. When we use administrative districts as the unit of analysis, we may have to control the geographical location variable. The objectivity of study can be largely impaired if we use administrative districts as the analytical unit when we compare villages with different geographical conditions. 4. When the topic of village endogamy/exogamy is at issue, we need to use the natural village rather than the administrative village as the unit of analysis. 5. More efforts should be made to identify socio-economic factors that might affect the zone of marriage networks. This paper intends to identify some shortcomings in the traditional methods of studying zone of marriage networks which have used administrative districts as the unit of analysis. In so doing, it also tries to propose a new method of analysis and some principles in our research. It is difficult to determine objectively the spatial range of marriage if we rely on administrative districts as the only analytical unit in our study. In the previous research, for example, when people living in the borderland between two different myon(townships) or do(provinces) marry people from adjacent villages that officially belong to different myon or do, the researchers have regarded their marriages as instances of a regional (myon-or do-level) exogamy. Many such problems in the research method are found in most of the previous field survey reports. In this regard, the author proposes some rules that we can follow in our future research on zone of marriage networks as follows: 1. We need to go into details of the spatial arrangement of marriages by subdividing the current areal unit of analysis into myon-level areas. 2. The concept of ‘zone of life’ or ‘sphere of everyday life’ is suggested for our study as an objective criterion on which we judge the spatial distances of areal marriage. The life zone here can be equated with the vicinity of a regular local fair, or the area where most of its residents go to the same market. It is almost equivalent to the traditional administrative area called hyon. 3. When we use administrative districts as the unit of analysis, we may have to control the geographical location variable. The objectivity of study can be largely impaired if we use administrative districts as the analytical unit when we compare villages with different geographical conditions. 4. When the topic of village endogamy/exogamy is at issue, we need to use the natural village rather than the administrative village as the unit of analysis. 5. More efforts should be made to identify socio-economic factors that might affect the zone of marriage networks.

제3이탈리아 산업지구 발전과정에 대한 비교 연구: 모데나와 미란돌라를 중심으로

권오혁 ( Kwon O Hyeog ) 한국경제지리학회 2003 한국경제지리학회지 Vol.6 No.1

It is the Third Italy`s industrial districts that is emerging as effective strategies for regional economic development since 1970`s. Compared with mass production system, it`s production system is characterized the cooperative networks of a number of enterprise specialized in specific sector or process. This work will analysis the course of growth and industrial characteristics of Modena engineering industrial district and Mirandola bio-industrial district as the exemplary industrial district, so elucidate new principle of building industrial space named development of industrial districts. This work point out three characteristics which these industrial districts have. First, these districts have the production system based vertical dis-integration and specialization among enterprise like general industrial districts in Third Italy. This factor make Modena and Mirandola`s production system coupled with specialized enterprise in coping with various demand of consumer. Second, technological innovation is very important factor in growing industrial districts. This factor contributes these two districts to have developed as the competitive industrial clusters in the world. Last point is the difference of local governance by the two city governments. Modena city government has made a lot of industrial spaces but in Mirandola the leading enterprise has contributed to shape the industrial district.

대도시 산업지역사회의 사회적 네트워크 실태와 정책대안 : 대구광역시 북성로 공구상가를 사례로

이철우(Chulwoo Lee),박순호(Soonho Park),권경희(Kyounghgee Kwoen) 한국지역사회학회 2006 지역사회연구 Vol.14 No.1

Buksungro Tools Commercial District is a typical industrial community in a metropolis. This paper aims to define the realities of social network at a commercial district as the base of existence for an industrial community, and to analyze the formation of social capital and its function. This paper also attempts to suggest programmes to revitalize Buksungro Tools Commercial District. The data for this research was gathered through the questionnaires on 121 enterprises and interviews. Most research on regional innovation emphasized that the exclusive strong relationship in local network helped to make regional innovation based on the tacit knowledge. However, recent research suggests that the open loose relationship is in a better position to establish the social capital. The exclusive strong relationship helps the fixed existing condition that plays barriers to make up and cumulate the social capital. This research attempts to establish the open loose social network to minimize the degree of the problems through the fixed existing condition. Buksungro Tools Commercial District has been developed in inner-city; therefore, there are many physical problems such as a shortage of parking spots, a lack of space for loading and unloading, many small-sized enterprises, and decrepitude buildings. The city government attempted to be reconstructed the area without considering the cumulated social capital in the community. The city policy in the area was considered as not good measures. The community has overcome the inferior physical environments through the strong social capital within the community. There is alternative programmes that encourage the members to establish the social capital through the social network.

집단에너지 네트워크에서의 열 연계 및 거래 특성 분석

송상화(Sang Hwa Song),이재승(Jae-Seung Lee),김현철(Hyun-Chul Kim),안창구(Chang-Koo Ahn) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

소규모 열 네트워크를 이용한 양방향 열공급 실증연구

김민휘(Min-Hwi Kim),이동원(Dong-Won Lee),김득원(Deuk-won Kim),허재혁(Jaehyoek Heo) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.1

In this study, the existing small-scale centralized-district cooling and heating system was retrofitted to form a small-scale heat network with two thermal-energy prosumers, and we empirically analyzed the feasibility of this bi-directional thermal network. In the experimental test, we identified the operation status of a small-scale thermal network based on existing solar thermal and geothermal heat pumps and modified it to form a bi-directional thermal-network system. The bi-directional heat supply was created by calibrating two thermal-energy prosumers to supply heat at predetermined times and converting the absorption heat pump in another building into another thermal prosumer. This experiment confirmed that bi-directional thermal transfer can be accomplished in a thermal network as well as in the conventional heat-supply method. The results of these empirical experiments also showed that the use of bi-directional thermal networks in heat transactions is economically feasibility and eco-friendly.

광역 열 네트워크망의 리턴수와 공급수 활용 및 분산 열원 융합 건물 냉난방 최적 운영 기법

박용국(Yong Kuk Park),이민구(Min Goo Lee),이태훈(Tae Hoon Lee),김태원(Tae Won Kim) 대한전자공학회 2021 전자공학회논문지 Vol.58 No.9

생태경관적 녹지연계망 정비방안에 관한 연구 : 전주시 전통문화구역 지구단위계획안을 중심으로

최만봉,최승희 전북대학교 부설 휴양및경관계획연구소 2007 휴양및경관연구 (J East Asian Landscape Studies) Vol.1 No.1

The rsearch was an establishment of the important green spaces in Jeonju and to present the basic frame of green network. The relationship which leads to the green spaces and traditional cultual district needs the connetion of green corridor. The ecological view is used as the space for the passeuggest a connection on the base of the important green network between the green spaces and buildings as well as streets. Consequently, a creation plans of green spaces are demanded green corridor for the basic frame of green network in the tradional cultural district in Jeonju.

Research on Tourist Perception of Grand Canal Cultural Heritage Based on Network Text Analysis:The Pingjiang Historical and Cultural District of Suzhou City as an example

정청캉,징치웨이,남경현 한국지능정보시스템학회 2023 지능정보연구 Vol.29 No.1

Taking Pingjiang historical and cultural block in Suzhou as an example, this paper collects 1436 tourist comment data from Ctrip. com with Python technology, and uses network text analysis method to analyze frequency words, semantic network and emotion, so as to evaluate the tourist perception characteristics and levels of the Grand Canal cultural heritage. The study found that: natural and humanistic landscapes, historical and cultural deposits, and the style of the Jiangnan Canal are fully reflected in the perception of visitors to the Pingjiang Historical and Cultural District; Tourists hold strong positive emotions towards the Pingjiang Road historical and cultural district, however, there is still more space for the transformation and upgrading of the district. Finally,suggestions for measures to improve the perception of tourists of the Grand Canal cultural heritage are given in terms of conservation first, cultural integration and innovative utilization.