사례기반추론 코스트 모델의 정성변수 속성가중치 산정방법

이현수,김수영,박문서,지세현,성기훈,편재호,Lee, Hyun-Soo,Kim, Soo-Young,Park, Moon-Seo,Ji, Sae-Hyun,Seong, Ki-Hoon,Pyeon, Jae-Ho 한국건설관리학회 2011 한국건설관리학회 논문집 Vol.12 No.1

For construction projects, the importance of early cost estimates is highly recognized by the project team and sponsoring organization because early cost estimates are frequently a foundation of business decisions as well as a basis for identifying any changes as the project progresses from design to construction. However, it is difficult to accurately estimate construction cost in the early stage of a project due to various uncertainties in construction. To deal with these uncertainties, cost estimates should be made several times over the course of the project. In particular, early cost estimates are essential process for successful project management. For accurate construction cost estimates, it is necessary to compare cost estimates with actual costs based on historical project data. In this context, case-based reasoning (CBR), which is the process of solving new problems based on the solutions of similar past problems, can be considered as an effective method for cost estimating. To obtain this, it is also required to define the attribute similarities and the attribute weights. However, no existing method is capable of determining attribute weights of qualitative variables. Consequently, it has been a well-known barrier of accurate early cost estimates. Using Genetic Algorithms (GA), this research suggests the method of determining the attribute weight of qualitative variables. Based on building project case studies, the proposed methodology was validated.

공공아파트 프로젝트 기획단계 공사비 산정시스템 개발

이현수,이흥근,박문서,김수영,안요섭,Lee, Hyun-Soo,Lee, Heung-Keun,Park, Moon-Seo,Kim, Soo-Young,Ahn, Jo-Seph 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.4

At the conceptual phase of a construction project, estimated construction cost is very important as it significantly influences the owner's decision-making. Accurate cost estimating, in the early stage of a public construction project, serves as a critical factor because initial decision-making effects the final cost of a construction project. However in the cases of Korean public apartment projects, excluding a few of the public owners, there is a problem in properly estimating construction cost due to the lack of construction cost estimating system. Thus, this research developed a public apartment cost estimating system using case-based reasoning that was suggested by a previous research with 66 cases of Korean public apartment projects. Based on the system experiments involving 19 public officers and 10 cases of Korean public apartment projects, the effectiveness of the system in terms of estimation accuracy and user-friendly was confirmed. As a result, the developed system has an error range of 1.47% to 13.74% and mean of 6.15%. In addition, the system was evaluated that it could greatly improve the current estimation task of public officers. Consequently, the results of this research can be used as a foundation for a technological advance in estimating construction cost and improving the accuracy and consistency of construction cost estimation.

지역별 기후에 따른 고소작업가능률 산정 - 서울, 인천, 부산 지역을 중심으로 -

이현수,조성준,박문서,황성주,김현수,Lee, Hyun-Soo,Cho, Sung-Jun,Park, Moon-Seo,Hwang, Sung-Joo,Kim, Hyun-Soo 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.3

O Having a highly reliable plan for the process and estimating an accurate construction period during the early stages of a construction project can prevent falsifying the plan and reduce the occurrence of construction delays. Moreover, it allows a succession of swift and accurate decisions to happen. The difficulty in obtaining an accurate estimate of the construction period is especially prominent in high-rise building projects because the works involved are very complicated and costly. As such, it is important that research is done to find out the impacts a reliable plan and good estimate of the construction period can bring with regards to the monthly work efficiency and success of a high-rise building project. However, due to the difference in climatic conditions at high altitude and surface level, the current way of calculating work efficiency in a typical project is inaccurate for a high-rise building project. With that, this paper aims to compute the work efficiency with height, taking into consideration the change in climatic elements at different working heights. A comparison of the results according to the climatic features of each city can also be done in this paper. According to the results calculated in work altitudes, the work efficiency in Busan falls the most. On the other hands, the work efficiency in Seoul falls the least. The reason these results are shown is the influence of wind speed at high altitude. The estimation of work efficiency at high altitude would be used for estimating construction period, feasibility studies, and selecting a city of high-rise building projects.

건설현장 위험영향요소 기반의 위험도 산정 방법론

이현수,김현수,박문서,이광표,이사범,Lee, Hyun-Soo,Kim, Hyun-Soo,Park, Moon-Seo,Lee, Kwang-Pyo,Lee, Sa-Bum 한국건설관리학회 2009 한국건설관리학회 논문집 Vol.10 No.6

Many work-related risk factors can cause construction site hazards. Considering variable and changeable characteristics of construction site, risk of same trade can be different by combination of inherent characteristics. But established safety management has performed like other industries not reflecting characteristics of construction. So, to suggest risk assessment methodology considering risk influence factors in construction site, this study extracts risk influence factors by literature reviews and surveys, builds the weighting system for classification of factors. And risk of trade is calculated based on frequency and severity of risk. Risk assessment methodology is suggested by integrating risk influence factors and risk of trade. From this, risk considering the conditions of construction sites can be derived and based on the derived risk, safety management can be performed more effectively. This study has meaning for assessing the risk which can reflect characteristics of construction site considering risk influence factors.

위치추적기술을 이용한 BIM기반 건설현장 안전관리 시스템

이현수,이광표,박문서,김현수,이사범,Lee, Hyun-Soo,Lee, Kwang-Pyo,Park, Moon-Seo,Kim, Hyun-Soo,Lee, Sa-Bum 한국건설관리학회 2009 한국건설관리학회 논문집 Vol.10 No.6

The main goal of construction projects from the past has been enhancing efficiency by reducing cost and time. but, seeing the current condition of safety management of many construction companies nowadays, it is true that not much attention has been paid to safety management for a long time. However, there are paradigm shift from the cost and term of works to safety management in the construction industry, from this circumstance the safety management is evaluated more importantly. Though less accident happens compared to past, the accidents are getting greater because construction projects nowadays are bigger and more complex and monetary loss from the accidents are increasing. Also, the severity is getting greater and even fatal. For this reason, more improved safety management is very necessary. Therefore, we are to propose more efficient system for safety management in this thesis. Technical parts for developing system include many technique such as Real Time Locating system, and other techniques like Monitoring module based on BIM, Data Mart, Alarm are also applied together. Through this system, in the construction site, safety management is performed more effectively and widely because the system can manage the human resource and fluid situation. Also, safety manager can conduct more systematically and advanced safety management through human resource dominated safety management.

상부 위암에 대한 근위부 위절제술 뜻 위전절제술을 시행한 환자의 영양상태와 삶의 질 비교

이현수,박종현,최훈,김재희,민락기,이상일,노승무,Lee, Hyun-Soo,Park, Jong-Hyun,Choi, Hun,Kim, Jae-Hee,Min, Lac-Kee,Lee, Sang-Il,Noh, Seung-Moo 대한위암학회 2005 대한위암학회지 Vol.5 No.3

Purpose: A total gastrectomy is generally peformed for the treatment of upper third gastric cancer. However, the optimal extent of resection for early-stage upper third gastric cancer is still controversial. In this research, we compared the nutritional status and the quality of life in patients who underwent a total gastrectomy with uncut Roux en Y esophagojejunostomy with those in patients who underwent a proximal gastrectomy with esophagogastrostomy for treatment of upper third gastric cancer. Materials and Methods: We reviewed 50 patients with no evidence of recurrent disease following curative surgery for upper third gastric cancer. Among this group, 25 patients underwent a total gastrectomy (TG) and 25 patients a proximal gastrectomy (PG). 8 TG and 4 PG patients were excluded from this study because of death, refusal to interview etc. The nutritional status was assessed by measuring body weight, serum albumin, serum hemoglobin, and serum total protein. The gastrointestinal function and the quality of life were assessed by Cuschieri grading and modified Visick qrading. Results: In analysis of covariance of age and preoperative serum albumin, PG patients demonstrated lower weight loss (P=0.038), elevated serum albumin (P=0.049), and better outcome based on modified Visick grading (P=0.016) than TG, but there were no significant differences in the serum hemoglobin change (P=0.165), serum total protein change (P=0.435), and Cuschieri grading (P=0.064) between the preoperative and the postoperative data. Conclusion: In this study, a proximal gastrectomy led to a better nutritional status and quality of life than a total gastrectomy, as judged from the low weight loss, elevated serum albumin and better modified Visick grade.

철근공사의 코일철근(Bar in Coil) 적용타당성 분석

이현수,김재곤,박문서,김현수,황성주,Lee, Hyun-Soo,Kim, Jae-Gon,Park, Moon-Seo,Kim, Hyun-Soo,Hwang, Sung-Joo 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.1

The proportion of rebar factory manufacturing which has been settled down in Korea recently seems to increase because of their strength such as high decreasing rate of rebar loss and manufacturing accuracy and the external factors such as an increase of downtown projects and a decrease of skilled workers. However, factory manufacturing using straight rebars causes a certain amount of rebar loss and an environmental problem including $CO_2$ emissions. To solve these problems, Bar in coil (BIC) has been introduced; however its application is very rare because it has not been produced so far in Korea and manufacturing machines of BIC are very expensive. Also, although BIC's application is expected to expand due to its strengths, few analysis of its application has been conducted. Therefore in this study, analysis of the BIC's characteristics and the influence to the rebar manufacturing industry are conducted for the advancement of rebar work as a basic research. To achieve this, inquiry on the present condition of rebar manufacturing industry in Korea is implemented. Then, the validation of BIC's applications by aspects of industry and the analysis of stakeholders' economical profit and loss are conducted.

안도 다다오의 이우환 미술관의 개념적 관계성과 공간구성 분석

황인애(Hwang, In-Ae),이현수(Lee, Hyun-Soo) 한국실내디자인학회 2019 한국실내디자인학회 학술대회논문집 Vol.21 No.1

The abandoned island Naoshima was reborn with the will of Chairman Soichiro Fukudake and the efforts of Tadao Ando. Tadao Ando designed the Benesse House Museum, the Chichu Art Museum, and the Lee Ufan Museum, which are called the three major museums of Naoshima. The museum of Ando designed buildings that harmonize with architecture, nature, and human beings. Among them, Lee Ufan of Lee Ufan Museum is a painter who focused on relationality in particular. In this study, the Lee Ufan Museum was selected as an example. This research focuses on the analysis of their conceptual relationship with the Lee Ufan Museum and the spatial composition that it implemented in architecture. The research methods include literature review, drawing analysis and field trip. Lee"s work trends can be seen to be concentrated on the relationship such as ‘objects-objects’, ‘objects-spaces’, and ‘objects-human beings’. From the perspective of Lee Ufan"s conceptual relationships, the architecture of Tadao Ando can be understood as the relationship such as ‘architecture-exposed concrete(matter)’, ‘architecture-human(moving line)’, and ‘architecture-nature(place)’. Through this analysis, the Lee Ufan Museum is not merely a solo work of Tadao Ando, but a successful case in which two outstanding artists to keep in step together as a collaboration between Ando and Lee.

아연결정유약의 결정 생성 및 제어를 위한 Zn₂TiO₄ 활용 연구

이현수,Lee, Hyun-Soo 한국결정성장학회 2017 한국결정성장학회지 Vol.27 No.4

$Zn_2TiO_4$, which is a progenitor of zinc crystallization, plays a significant role in controlling the crystallization of willemite ($Zn_2SiO_4$) in forming glaze at low temperatures. Thus, $Zn_2TiO_4$ was used to formulate stable willemite and to gain structural control. When synthesized 15 wt% of $Zn_2TiO_4$ is added to engobe and then applied, it can manipulate its crystallization and location. Additionally, when colorant is added to $Zn_2TiO_4$ and then applied to engobe, the mixture's colorant effect can be shown at crystallization. Certain characteristics of synthesized $Zn_2TiO_4$ enable various engobes to be applied to clay bodies. With a single glazing, the crystallization, location, and color of the crystals can be discretionarily regulated.

품질성과지표 중심의 건설프로젝트 품질성과관리시스템 개발

이현수,박문서,송상훈,Lee, Hyun-Soo,Park, Moon-Seo,Song, Sang-Hoon 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.3

Quality is the core competence for customer satisfaction in current competitive business environments. The manufacturing companies regard the quality as the success factor in enhancing competitiveness and foremost concept of the management innovation. But in many cases, the basis for the quality management and the action programs are not prepared yet. In construction industry, normally schedule and cost have priority over quality and the level of overall quality is relatively lower than other industries. This is caused by the vague quality goal and result-oriented management. This study suggests the quality performance indicators for measuring performance objectively, and develops the continuous quality monitoring system based on those indicators. By using this system, the quality improvement can be expected and corporate quality competitiveness can be ensured.