• Air Cleaning Technology
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• v.34 no.1
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• pp.8-15
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• 2021

• Korean Journal of Construction Engineering and Management
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• v.18 no.6
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• pp.26-37
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• 2017

Preliminary scheduling at the initial stage of planning phase is usually performed with limited information and details. Therefore, the reliability and accuracy of preliminary scheduling is affected by personal experiences and skills of the schedule planners, and it requires enormous managerial effort (or workload). Reusing of historical data of the similar projects is important for efficient preliminary scheduling. However, understanding the structure of historical data and applying them to a new project requires a great deal of experience and knowledge. In this context, this paper propose a framework and methodology for automated preliminary schedule generation based on historical database. The proposed methodology and framework enables to automatically generate CPM schedules for airport projects in the early planning stage in order to enhance the reliability and to reduce the workload by using structured knowledge and experience.

• 월간 기계설비
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• no.3 s.188
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• pp.34-35
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• 2006

건축법 중 건축물의 설비기준등에 관한 규칙의 일부가 지난 2월 13일 개정, 공포되었다. 이번에 개정된 주요 내용은 그동안 공동주택 및 다중이용시설의 환기설비기준이 없어 적정수준의 실내의 공기 질을 확보하지 못하여 국민건강을 해치는 등의 문제점을 개선하여 △공동주택의 필요환기 횟수를 시간당 시간당 0.7회 이상이 되도록 하고 다중이용시설 중 지하 역사의 경우 필요 환기량을 1인 기준으로 시간당 25㎡ 이상이 되도록 하는 등 건축물의 용도에 따라 환기설비기준을 정함으로써 공동주택 및 다중이용시설의 실내의 공기 질 개선을 통해 국민의 건강 증진에 기여할 것으로 기대된다. 또한 △피뢰설비의 설치기준을 강화하여 건축물의 높이가 60m 이상인 고층 건축물은 측면에 낙뢰방지시설을 설치하도록 개정함으로써 고층 건축물의 벼락 피해를 예방할 수 있을 것으로 기대된다. 본지는 건축물의 설비기준등에 관한 규칙 중 신∙구조문 대비표를 게재하오니 회원사 여러분의 많은 참고를 바란다.

• Korean Journal of Construction Engineering and Management
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• v.5 no.4 s.20
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• pp.87-96
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• 2004

The construction duration in apartment construction is an important factor which affects project cost. Henceforth, the time shortening is essential to retrench project cost and project risk when there adopt Five-Day Workweek and introduce apartment sales after completion of construction. Therefore, the purpose of this study is to examine closely the affecting factors on the duration of framework which forms about $40\sim50\$ percent of total time in apartment construction by analyzing the schedule mechanism of typical floor and to show the reasonable time shortening methods by case study. The shown schedule mechanism and basic schedule table can utilize as a guideline in case of scheduling of framework in the existing construction method. Also, the shown time shortening methods by three case studies will guide the direction and process of time shortening while there need time shortening in many-sided projects.

• Korean Journal of Construction Engineering and Management
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• v.19 no.5
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• pp.111-120
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• 2018

Recently, Domestic public construction projects are experiencing a great deal of disputes because of the growing uncertainty about the criteria for calculating the prolongation cost. In addition, researchers have been studying various systems and proper cost estimates in an effort to reduce the uncertainty of these systems and the occurrence of disputes. However, there is no standard yet for social consensus. Meanwhile, The study on the classification system according to the recognition standard of accounting has been systematically studied. As a result, the concepts of accrual and cash basis are defined separately. The purpose of this study is to verify the possibility of applying the concept of 'accrual basis' to the Standard for calculation of prolongation cost. Therefore, As a result of analyzing the occurrence pattern of Job-site overhead cost, it is confirmed that actual costs can not be calculated by the cash-basis method. In particular, the implications of the necessity of the accrual-basis method should be more strictly indicated in the case of items such as indirect labor costs and welfare benefits. In addition, the contractor 's claim report and the appraisal report were examined. As a result, it was confirmed that the calculation situations of prolongation costs are biased to the cash-basis method. In this way, it is suggested that necessary to supplement the calculation standard of the actual costs from the point of view of accrual basis.

• Explosives and Blasting
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• v.31 no.2
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• pp.50-58
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• 2013

Since various types of safety facilities have been located around blasting construction site, each of the institutions with regard to blast works has prepared limit criterion of blast vibration, respectively. But these criterions applied for limiting vibration are causing harmful effect including construction cost increasement and construction time extension due to exceedable high level application. In this study, more reasonable limit of blast vibration was suggested after reviewing criterions based on existing design and construction cases and analyzing of problems of applied criterions.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.6
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• pp.37-43
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• 2004

실내공기오염 문제가 미국, 유럽, 일본 등 선진국을 중심으로 고조되면서, 최근 국내에서도 이 문제에 대해 적극적으로 논의되기 시작하였으며, 정부관련기관 및 연구기관을 중심으로 대책마련을 위한 관계법령의 정비 및 연구가 활발히 진행되고 있다. 그 구체적인 법령으로 작년(2003. 5. 29)에 환경부에서 고시한 "지하생활공간공기질관리법개정안(다중이용시설 등의 실내공기질관리법)"을 들 수 있으며, 이 법안에서는 실내공기질 유지기준 및 권고기준, 실내 공기질 공정시험법 등에 대해 공고하고 있다. 또한 건축자재에서 발생하는 오염물질에 관해서도 규정을 하고 있다. 이에 국내에서도 생산된 건축자재에 대해 포름알데히드, TVOC 방출강도를 평가, 등급화 하는 인증제도가 도입되어 있으며, 평가/분석을 실시하는 인증시험기관도 이미 몇 군데 지정되어 있는 상태이다. (중략)상태이다. (중략)

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.458-461
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• 2006

With the opening in construction market, more diversified and internationalized construction culture is imported, but the level of our construction culture and policy is still not met the international standards. For example, there is a difference in the liquidated damages at delay due to the reason of builder imputation during the public construction project comparing the international standards like damages. It may lead to the potential claim. In this study, via comparing and analysis on the relevant international standards and extension expense for terms of work, actual compensation is selected, and improvement of liquidated damages like damages is presented.

• Journal of Korean Library and Information Science Society
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• v.50 no.4
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• pp.635-658
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• 2019

In this study, the harmful factors measured in S university's central library were divided into ① air harmful substance ② biological harmful factors ③ carbon monoxide, carbon dioxide, and nitrogen dioxide concentration, measured and analyzed compared to the relevant criteria. The analysis showed that the harmful substances in the air - fine dust, asbestos, volatile organic compounds and formaldehyde - were all lower than the relevant standards, and that biological harmful factors such as fungi in the air, gramophageal bacteria, and endotoxin were also found to have no particular problems. The concentration of carbon monoxide, carbon dioxide, and nitrogen dioxide in the air was also maintained without any unusual factors compared to the concentration in the ordinary atmosphere. However, the library is a multi-use facility that needs regular cleaning and ventilation to manage the environment.

• Journal of Korean Tunnelling and Underground Space Association
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• v.18 no.2
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• pp.175-181
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• 2016

In this paper, the liquid air was selected as the refrigerant in artificial ground freezing to be used for rapid ground freezing and to reduce the risk of suffocation and the applicability of liquid air was verified. In order to evaluate the stability of the liquid air, the oxygen concentration of mixtures with liquid nitrogen and liquid oxygen was experimentally examined to meet the oxygen concentration criteria in the Occupational Safety and Health Act. In addition, the effects of the mixture ratio of liquid nitrogen and liquid oxygen, pressure and flow rate change in the storage vessel on the oxygen concentration in the liquid air were investigated. As a result, the ratio of liquid nitrogen and liquid oxygen 8: 2 was shown to meet the oxygen concentration standards. Pressure and flow rate change in the storage vessel did not have significant effects on the oxygen concentration in the liquid air.