• Korean Journal of Construction Engineering and Management
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• v.9 no.6
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• pp.147-155
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• 2008

In the 1970s, increasing penetration of the housing co-housing policy, reconstruction be a great success to improve 1990‘s Old aged apartment's performance. However, in case of reconstruction, it causes the problem such as city environment destruction, resource waste, real-estate speculation etc. With the trend of sustainable construction and resource recycling, remodeling gets more attention than before. In case of country's remodeling, conventional method causes some problems such as delayed construction period and increased cost. Therefore, efforts that obtain economical efficiency are required to power remodeling through use of prefabrication method like PC technology that is useful for reduction effect of construction period, cost and site labor and excellent quality. This research indicates reduceing factor for facilitating prefabrication method and technology selecting framework through specific of Expanding Floor method and remodeling cases to increase the efficiency of remodeling, considers construction parties approaching plan for prefabrication as occasion that powers remodeling.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.634-637
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• 2004

Hereafter, the housing construction industry in a domestic country has to give more relative importance to the redevelopment and the rebuilding of existing housing rather then the housing supply methods by the development of new housing sites, and those tendencies are rapidly spreading out. Also, because apartment occupies $50\%$ over of the existing housing, its maintenance, repair, remodeling and reconstruction got to be necessary area for the slumming prevention of a residential area and the disaster prevention occurred by durability lowering of building. But, as having focused on the housing supply methods by the development of new housing sites, the domestic construction industry has relatively carelessly dealt with deconstruction areas including maintenance, remodeling, redevelopment and reconstruction of old existing housing. Therefore the process of the deconstruction is not well suited to regulations and related technology. This paper suggests the present situation of C&D production and new demolition process through comparative analysis of the present demolition works.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.53-61
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• 2009

With the Government's policy of increasing the supply of residential houses in 1970s, the number of apartments have increased dramatically, and as the result, the number of old aged apartment are increasing too. Therefore remodeling is being executed to improve the residential environment. The rate of remodeling is increasing instead of rebuilding because rebuilding takes more resource and because of the realestate issue. There are many uncertainties in construction progress of remodeling such as communication between personnel, demolition and repair work. There are no standard for remodeling construction so such problems have been causing more problems. It has been found that BIM (Building Information Modeling) may be effective for resolving issues of standardization of remodeling construction. Therefore this study wishes to develop a standard process for remodeling work through BIM to estimate the possibility of its use at remodeling sites. Based on this, I wish to contribute to the issue of achieving construction efficiency pursued by BIM.

• Bulletin of Food Technology
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• v.25 no.1
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• pp.28-43
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• 2012

한국 식품화의 위상은 구이류 및 전골류 조리시 발생하는 냄새, 연기, 기름 튐 등의 문제로 인해 낮게 평가 되고 있는 실정이다. 현재 사용하고 있는 불판 및 가열원료가 다양하여 맛의 균일화가 어렵고 사용 후 세척처리가 번거로운데다 환경오염까지 발생시킨다. 구이 및 전골에 소비되는 에너지가 잔량을 모두 섭취할 동안 연속적으로 공급하므로 에너지 소비 및 내부 공기조건이 열악한데 반해 연기 및 냄새와 관련된 제품의 개발과 생산에 참여하는 업체는 증가하고 있다. 하지만 기술력 및 자본력이 미미한 수준에 있어 많은 기술적 측면의 보완이 요구된다. 또 소스, 양념, 부재료 등의 가공처리를 외국인의 식문화에 적합하도록 맛, 향, 관능의 관점에서 규격화 및 현지화도 요구되며, 공급되는 원재료의 고기종류, 규격, 등급 등의 조건들이 국내 관능뿐만 아니라 외국인의 관능적인 관점에서 표준화가 시급하다. 주한 외국인을 대상으로 한 설문에서 59%가 한국음식의 세계화가 가능하고 89.9%가 한식메뉴를 소개할 의사가 있는 것으로 조사되었다. 이는 외국인 소비자의 인지도에서 불고기와 갈비 등의 구이류가 다른 한식보다 선호도가 증가하는 것이기 때문인 것으로 분석된다. 2009년 농림수산식품부가 '한식 세계화 프로젝트'를 선포하여 1만여 곳의 해외식당을 2017년까지 4만 곳으로 증가할 예정이다. 따라서 한식문화의 표준화를 위한 용어 재료 기구 단위 등의 표준화 기반개발을 바탕으로 조리 및 식문화의 표준화가 요구되고 있다. 우리나라는 구이전문점들이 일반주거 및 아파트 단지에 위치하고 있어 연기와 냄새에 대한 민원 및 분쟁이 발생되고 있다. 이에 집진, 제연 설비의 설치비용이 많이 소요되고 있으며 대부분의 구이설비가 수입제품으로 규모가 매우 크다. 일본의 경우 2002년도부터 음식점에서 발생하는 연기에 관한 규제를 법제화하였다. 위의 기술적, 경제 산업적, 사회 문화적 측면의 필요성을 바탕으로 본 연구는 연기 음식 냄새 저감 성능이 뛰어난 친환경 저에너지의 가열조리 기구 개발 및 국내외 현장적용 산업화 모델 구축을 통해 한식당 시설 개선 및 고급화를 유도하고 세계시장에서의 한식문화 경쟁력을 확보코자 한식문화 경쟁력 확보와 경제, 문화, 산업적 성공 비즈니스 모델을 제시하였다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.2A
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• pp.137-148
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• 2010

This study proposes the optimal ratio of vertical load-carrying capacity (${\beta}$) by investigating structural performances and economic efficiency in the extradosed bridges. Without design standards for the extradosed bridge, Japanese design standards have been used domestically. For the design live load, DL24 is found to be more adequate than DB24. Using the DL24 load, parameter studies are carried out. The parameters are 'main tower height', 'main girder stiffness', and 'cable arrangement'. As a result, it is found that one side cable-stayed extradosed bridges are more economical than double side cable-stayed extradosed bridges. This study also shows that when the ratio of vertical load-carrying capacity(${\beta}$) is 30~50% in the extradosed bridge with the ratio of tower height to main span length 1/6, the extradosed bridge is most economical because of the cable stress less than the allowable stress.

• Journal of Korean Society of Steel Construction
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• v.16 no.5 s.72
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• pp.609-619
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• 2004

An investigation was conducted on the activities around Europe in order to solve the problem of the thermal bridging of steel studs, which had caused a significant disadvantage. This study included the following: diminishing the contact area between the studs and the sheathing, lengthening the heat transfer route, replacing the steel web with a less conductive material, and placing foam insulation in locations where the thermal shorts are most critical. Although energy efficiency is usually the focus of such foreign cases because their stud application is mostly limited to low-rise residential buildings, both structural and thermal performance are taken into consideration in this study because these target middle-story buildings. A hybrid stud composed of steel and polymer was also developed. This hybrid stud, which is 150 SL in size, is made of a galvanized steel sheet (SGC58) and a glass fiber reinforced polymer (GFRP) withepoxy bonding. A total of 32 specimens were manufactured. Its parameters comprise two types of connection detail,s: the thickness of steel (1.0mm and 1.2mm) and of the GFRP (4mm-4ply and 6mm-6ply), and the ratio of the length to the depth (L/D = 3, 6, 9, 12). Steel stud specimens with the same conditions were compared to the hybrid stud. The test revealed that in the case of the steel specimen with a thickness of 1.0mm, the maximum load of hybrid studs increased an average of 1.62 times comparedto that of the steel stud. In the case of the steel specimen with a thickness of 1.2mm, on the other hand, the average increase was 1.46times. All specimens showed full composite action until the collapse.

• Journal of the Korean Institute of Gas
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• v.24 no.2
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• pp.1-8
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• 2020

Centrifugal pump is a facility that transfers energy to fluid through centrifugal force, which is usually generated by rotating the impeller at high speed, and is a major process facility used in many LNG production bases such as vaporization seawater pump, industrial water and fire extinguishing pump using seawater. to be. Currently, pumps in LNG plant sites are subject to operating conditions that vary depending on the amount of supply desired by the customer for a long period of time. Pumps in particular occupy a large part of the consumption strategy at the plant site, and if the optimum operation condition is not available, it can incur enormous energy loss in long term plant operation. In order to solve this problem, it is necessary to identify the performance deterioration factor through the flow analysis and the result analysis according to the fluctuations of the pump's operating conditions and to determine the optimal operation efficiency. In order to evaluate operation efficiency through experimental techniques, considerable time and cost are incurred, such as on-site operating conditions and manufacturing of experimental equipment. If the performance of the pump is not suitable for the site, and the performance of the pump needs to be reduced, a method of changing the rotation speed or using a special liquid containing high viscosity or solids is used. Especially, in order to prevent disruptions in the operation of LNG production bases, a technology is required to satisfy the required performance conditions by processing the existing impeller of the pump within a short time. Therefore, in this study, the rotation difference of the pump was applied to the ANSYS CFX program by applying the modified 3D modeling shape. In addition, the results obtained from the flow analysis and the curve fitting toolbox of the MATLAB program were analyzed numerically to verify the outer diameter correction theory.

• Journal of the Korean Recycled Construction Resources Institute
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• v.4 no.2
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• pp.180-186
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• 2016

There are many apartment buildings with the government's policy of increasing the supply of residential houses in Korea. Roughly 60% of the Korea population are living in apartment buildings. Since the 1970s, the Korean economy has grown enormously, the economic and social structure was radically transformed to industrialization and urbanization step. A village has grown into a large town in Korea and apartment buildings was constructed to solve national housing shortage by the Korean government and the construction company. Since the 2000s, this apartment buildings which was built in the 1970s and 1980s had become gradually deteriorated. So, reconstruction and remodeling project of apartment buildings have been come into request in Korea. There are two way to improve the residential environment. The one is remodeling of apartment buildings and the other is reconstruction of that. Therefore, we carried out questionnaire and survey study of the preference on the reconstruction and remodeling of old aged apartment which were located in daejeon province. As a result, the preference rate of remodeling is increasing instead of reconstruction because reconstruction of apartment buildings takes more money and needs long construction period.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.428-437
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• 2017

Recently, local government has established a development strategy which takes into account the quality of each area, in order to solve the problems posed by poor development, hindrance of the urban landscape, the limits imposed by relevant laws, etc. However, the number of floors is an important factor which determines the urban landscape, planning density and quality of the external space. This planning factor has a very different effect according to the terrestrial circumstances, number of households, underparking ratio, green space ratio and floor area ratio. Therefore, in this study, a case analysis and case study are conducted and the correlation between each index is clarified. The conclusions of this study are follows. Firstly, flexibility should be ensured by taking into consideration the density indicators, average number of floors, and residential environmental performance measures in related laws and systems. Secondly, it is necessary to develop a wide-area planning method that extends the planning concept from the beginning of planning to neighboring blocks or cities. Thirdly, deregulation measures should be implemented, such as establishing specialized strategies for each region, and regulatory measures for encouraging different types of development.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.1
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• pp.27-35
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• 2019

The existing middle-long span railway bridge has been mainly applied to steel box girder bridges. However, the steel box girder bridges have disadvantages in securing the space under the bridge, and the main girder is made of a thin plate box shape, resulting in a ringing noise due to the vibration. Many complaints about noise have been raised. For this reason, there is a need for the development of long railway bridges that can replace steel box girder bridges. In this paper, the characteristics of the steel composite railway bridge currently developed were introduced and a time history analysis was conducted using MIDAS Civil reflecting the speed of KTX load for 40m and 50m bridges. In addition, from the analysis results, the dynamic behavior of target bridges were verified and it was examined whether they meet the dynamic performance criteria proposed in the railway design standards. As a result, all of the bridges under review satisfied the dynamic safety criteria, however, in case of 40m of span, the vertical acceleration value was very large. In order to solve this problem, authors proposed the improvement plan and corrected the cross section to confirm that the vertical acceleration decreased.