리모델링 공동주택의 가격결정요인에 관한 연구

김재성,조규만,김태훈,Kim, JaeSung,Cho, Kyuman,Kim, Taehoon 한국건설관리학회 2016 한국건설관리학회 논문집 Vol.17 No.3

건설 산업에서 공동주택의 리모델링은 최근 큰 이슈로 떠오르고 있다. 그러나 리모델링이 이루어진 공동주택의 가치평가나 가격변화에 관한 연구가 매우 부족하고, 정확한 가치나 가격에 대한 기준이 없기 때문에, 많은 의사결정자들이 리모델링 사업에 대한 수행여부를 결정하는데 어려움을 겪고 있다. 따라서 본 연구에서는 (i) 실제 리모델링이 이루어진 14개의 공동주택 사례를 수집하고, (ii) 리모델링 공사로 인해 변화된 다양한 특성들이 리모델링된 이후의 공동주택의 가격에 미치는 영향을 살펴보았으며, 이를 중심으로 리모델링 공동주택의 가격결정에 영향을 미치는 요인을 제시하였다. 본 열구의 결과를 활용하면, 공동주택 리모델링에 대한 중요 요소들을 파악하고 리모델링 된 공동주택의 가격에 대한 객관적인 근거를 제시 할 수 있을 것이며, 더 나아가 공동주택 리모델링 사업 수행 전에 가격을 예측하기 위한 기초연구가 될 수 있을 것으로 기대된다. Remodeling of multi-family house (MFH) has emerged as a major issue in the construction industry. Many decision-makers are struggling to determine whether to conduct a remodeling because of insufficient information including standard or method for projecting the price of their facilities after remodeling works. In this context, this research has conducted for analyzing how the price of the MFH is shifted by remodeling works. To achieve this research goal, (i) fourteen MFH remodeling cases were collected and (ii) price variation for the collected cases was analyzed in order to figure out how remodeling work affects the price of MFH cases. Finally, this research suggested the factors determining price of the MFH, wherein remodeling work has been conducted. From the results of this research, it is expected that the decision-makers can understand what is the crucial factors for determining the price of their MFH when they plans remodeling, and further this research can be a corner stone for developing a model for predicting the price of MFH if remodeling would be performed.

OPC UA 기반 스마트팩토리 디지털 트윈 테스트베드 시스템 개발

김재성,정석찬,서동우,김대기,Kim, Jaesung,Jeong, Seok Chan,Seo, Dongwoo,Kim, Daegi 한국멀티미디어학회 2022 멀티미디어학회논문지 Vol.25 No.8

The manufacturing industry is continuously pursuing advanced technology and smartization as it converges with innovative technology. Improvement of manufacturing productivity is achieved by monitoring, analyzing, and controlling the facilities and processes of the manufacturing site in real time through a network. In this paper, we proposed a new OPC-UA based digital twin model for smart factory facilities. A testbed system for USB flash drive packaging facility was implemented based on the proposed digital twin model and OPC-UA data communication scheme. Through OPC-UA based digital twin model, equipment and process status information is transmitted and received from PLC to monitoring and control 3D digital models and physical models in real time. The usefulness of the developed digital twin testbed system was evaluated through usability test.

장갑강 용접부 방탄시험 대체 표준화

김재성(Boyoung Jaesung Kim),김용(Yong Kim),이희준(Heejun Lee) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.11

전차, 자주포, 차륜형장갑차 등은 균질압연장갑강(MIL-STD-12560)과 고경도장갑강(MIL-STD-46100)을 사용하여 용접제작하고 있다. 이에 대한 용접부 성능 검증을 위해 ‘H’형상의 시험편을 제작 후 사격 방탄시험 수행하고 있으며, 시험기관은 미국을 포함한 일부 해외 시험기관으로 한정적이고, 제작비용을 포함하여 최소 8,000만원/회 가 소요되는 고가의 시험이다. 이에 따라 미국 내에서도 시험의 수요가 낮아 시험용 탄 수급문제가 발생하여 10set이상의 시험편을 묶어 시험하도록 요구되고 있는 실정으로 과도한 시험비용 및 시간낭비 초래하고 있다. 또한 방탄시험의 신청 및 진행도 미국내 법인만 가능하므로 현실적으로 국내 연구기관 및 기업체는 시험이 불가하여 국내 시험 기관에서 수행 가능한 방탄 시험 표준 제정을 통한 합리적인 용접 성능 시험 절차가 지속 요구되는 상황이다. 특히 고경도 장갑강 및 균질압연장갑강의 충격 흡수 능력을 평가하기 위해 일반 산업규격인 저온 충격시험이 적용되는 점을 고려하였을 때, H-plate 방탄시험의 국내시험 대체 가능성이 높아질 것으로 예상된다. 이에 본 연구에서는 기존 H-plate 방탄시험을 대체 하여 비용/시간 절감 및 제품 수급을 원활하게 할 수 있는 국내 방탄시험 표준 제정의 시급성에 의해 방탄시험을 저온 충격시험으로 대체하기 위한 표준 제정 연구를 수행하였다.

GaAs MESFET을 이용한 5㎓ 무선랜 용 MMIC 발진기 구현에 관한 연구

김재성(Jaesung Kim),김종화(Jonghwa Kim),송재인(Jaein Song),고민호(Minho Go),박효달(Hyodal Park) 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.11

리모델링 사업에 따른 공동주택의 가격변화에 관한 연구

김재성 ( Jaesung Kim ),조규만 ( Kyuman Cho ),김태훈 ( Taehoon Kim ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1

Construction of Multi-Family Housing(MFH) was rapidly spread in the 1990s, it has been mostly passed more than 20 years and it is faced to aging time. Remodeling has emerged a major issue in the construction industry as an alternative of improvement and recovery the initial performance of the deteriorated MFH. But, Many decision-makers are struggling to determine whether to conduct a remodeling because of profitability. In this context, this research was conducted as the following steps to achieve this research goal, i) remodeled MFH cases and comparative cases were collected, ii) the price information based on three time frames (i.e., before remodeling, after remodeling, and present) was collected, and iii) the relative price variation of the remodeled cases was analyzed and finally it is revealed that there are four patterns of price variation.

LARD 시스템 활용 및 성능분석

김재성(Jaesung Kim),이상민(Sang Min Lee),정희석(Heeseok Jeong),이승민(SeungMin Lee),김명일(Myungil Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4

In this paper, a linear structural analysis system named LARD is presented. The proposed system has 3-tier architecture ; client, middle, server layer. To analysis large-scale problems, the ADVENTURE solid solver was adopted as a general-purpose finite element solver and a supercomputer was adopted as parallel computational platform. The problem solving performance and scalability of this structural analysis system is demonstrated by illustrative examples with different sizes of degrees of freedom.

P-wave method를 사용한 국내 지진 관측소의 토층전단파속도 예측

김재성(Kim, Jaesung),김병민(Kim, Byungmin) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10

과학기술 정보화의 현황과 과제

김재성(Jaesung Kim),이윤석(Yoonseok Lee) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1

국가차원의 지식의 효율적 창출과 활용, 확산의 촉진이 국가기술혁신의 핵심요소로 등장함에 따라 국가 정보화는 자국의 국제 경쟁력 강화의 중요 수단으로 인식되고 있다. 특히 과학기술 정보화는 급속히 변모하는 과학기술 커뮤니케이션 구조에 긴밀히 대응하고 과학기술 지식 정보의 생산, 축적ㆍ관리, 유통 전단계를 체계적이고 효율적으로 지원한다는 점에서 국가적 중요성이 매우 크다고 할 수 있다. 본 연구에서는 우리나라 과학기술 정보화의 추진 현황과 성과를 살펴보고 보다 효율적이고 체계적인 과학기술 정보화의 추진을 위한 방안을 제시하였다. It has lately been recognized that the national informatization is one of the most important ways to reinforce a nation's global competitiveness because the promotion of knowledge creation, utilization and dissemination in a national level play a role of key factor in national technology innovation. The importance of science and technology informatization is constantly increased since it cope with new R&D communication environment that is rapidly changed and support efficient means to the entire process of knowledge creation, accumulation/management and dissemination. This paper overview the present status and result of science and technology informatization of Korea and propose several policy issues and recommendations for improving the efficiency of informatization.

슈퍼컴퓨팅 기반의 대규모 구조해석을 위한 전/후처리 시스템 개발

김재성(Jaesung Kim),이상민(Sang Min Lee),이재열(Jae Yeol Lee),정희석(Heeseok Jeong),이승민(Seungmin Lee) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.2

The requirements for computational resources to perform the structural analysis are increasing rapidly. The size of the current analysis problems that are required from practical industry is typically large-scale with more than millions degrees of freedom (DOFs). These large-scale analysis problems result in the requirements of high-performance analysis codes as well as hardware systems such as supercomputer systems or cluster systems. In this paper, the pre- and post-processing system for supercomputing based large-scale structural analysis is presented. The proposed system has 3-tier architecture and three main components; geometry viewer, pre-/postprocessor and supercomputing manager. To analyze large-scale problems, the ADVENTURE solid solver was adopted as a general-purpose finite element solver and the supercomputer named ’tachyon’ was adopted as a parallel computational platform. The problem solving performance and scalability of this structural analysis system is demonstrated by illustrative examples with different sizes of degrees of freedom.

Evaluation of Welding Quality using Servo-Gun Displacement Data for Field Spot Welding

Jaesung Kim(김재성),Jooheon Park(박주헌),Sanghyeok Jeong(정상혁),Bokdeok Seo(서복덕) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.5

To ensure quality of spot welds, various nondestructive testing methods are used in addition to destructive testing methods, such as tensile shear tests and metallographic examination. Specifically, ultrasonic evaluation is widely used for measuring the nugget size in resistance spot welding. This study focuses on determining the possibility of establishing a standard to evaluate the quality of resistance spot welding in real time using servo-gun displacement data. Two-, three, and four-layered materials, including galvanized steel and hot stamped steel, were used in the experiment. To obtain a welding lobe diagram, we performed resistance spot welding three times under the same conditions, and secured the servo-gun data, which change depending on the expansion and contraction of the material. The strength and fracture mode data obtained from a tensile shear test were compared with the servo-gun displacement data, and the results were analyzed. The results evidently confirmed that the displacement data of the electrode of the medium-sized C gun clearly correlated with the tensile strength data of welding. However, the displacement data of the large C gun exhibited a slightly low correlation, presumably because of a mechanical issue. Furthermore, it was predicted that the results of this study could be used for real-time welding quality evaluation with minimal additional costs.