• 한국재난정보학회 논문집
• /
• 제13권2호
• /
• pp.233-248
• /
• 2017

초고층 건축물의 발생 가능한 화재를 방지하기 위해서는 통일된 법 규정과 합리적인 설계가 필요하다. 이를 위해 본 연구는 초고층 및 대형 건축물관련 건축심의 성능위주설계(PBD)평가 재해영향평가(DIA)를 중심으로 이 제도의 대상이 되는 건축물과 그 내용상의 문제를 분석하여 성능위주 설계를 기반으로 하는 화재 공학적 화재예방 개선방안을 도출하였다. 먼저 법 기준개선측면에서는 첫째 성능위주설계(PBD)평가와 재해영향평가 등에 있어서 상당부분이 동일한 내용임에도 불구하고 두 개의 법령으로 이원화된 부분은 일치 시키고 통폐합해서 운영하는 것이 필요하다. 둘째, 성능위주설계(PBD)평가와 재해영향평가(DIA)의 통폐합이 불가능하다면, 성능위주설계(PBD)평가와 재해영향평가(DIA)의 내용의 영역이 명확히 구분되어 정립되어야 한다. 다음 초고층 건축물의 공학적 화재위험성에 대한 개선방안으로는 NFPA 규정대로 첫째 특별 피난 계단에서 직통계단의 규정을 개정할 필요가 있으며, 배연창 대신 기계식 배연설비를 설치하는 경우, 미국에서 사용하는 샌드위치 가압방식(Sandwich Pressurization) 허용하고, 둘째 특별 피난계단용 제연설비는 화재시 구간별로 급기 할 수 있도록 기준의 개정 및 설계초기 단계부터 준공까지 성능위주설계 진행 등이 필요한 것으로 나타났다. 향후 이상의 연구에서 도출한 개선책 반영과 함께 초고층 건축물의 대한 또 다른 고려사항들에 대해 추가적인 연구가 진행되고, 또한 유지관리에 대한 연구가 진행되어 그 결과를 반영할 수 있는 초고층 건축물이라면 화재로 인한 인명피해 및 재산손실을 줄이는데 획기적인 기여를 할 것으로 예상된다.

• 한국방재안전학회논문집
• /
• 제7권1호
• /
• pp.9-16
• /
• 2014

고수압 시공 조건에서는 시설물 자체의 건설로 인하여 발생하는 주변지반의 이완 및 손상의 발생 그리고 시설물내로의 해수의 유입을 방지하기 위한 차수 및 지수설계 및 시공이 중요한 관건이다. 그라우팅 공사는 현재 지하철건설, 고속 철도건설, 각종 산악터널건설, 하천 저수지 재방 신설 및 보수공사 등에 년간 수조원 대의 시장규모를 형성하고 있지만, 설계 및 시공관리에 대한 관리기준이 정밀하지 못하여 경험적인 판단에 의존하는 부분이 너무 많아 경제적 손실도 매우 클 것이라고 쉽게 단정할 수 있다. 그라우팅 기술은 국가적 차원의 대규모 중요 건설공사 현장에서 필수적인 기술로 사용되고 있지만 기술에 대한 인식이 빈약하고 정립된 관리기준이 부재하여 신뢰성의 낙후가 심각한 실정이다. 따라서 본 연구는 고수압 조건에서 지반재해 저감을 위한 최신 그라우팅 시공관리기술에 대한 기초 연구를 제공함이 그 목적이다.

• 한국전산유체공학회지
• /
• 제20권2호
• /
• pp.52-60
• /
• 2015

The objective of this research lies in the effect of installation parameters influencing on the wind proof performance of the coastal forest for damage prevention. The dissipation ratio of incident wind power is developed as an assessment index to make a lumped parameter study possible. From the real field data of East, West, and South Sea bounded on the Korean peninsula, single and double storied forests were modeled in three-dimensional shape with computer aided design, and so was done the artificial structures such as wind break, sand accumulating fence, and sand dune, etc With a commercial code ANSYS-CFX, the computational result from the comparison of dissipation ratio between single and double storied forest shows the effect of composition, and also the installation effect is investigated for artificial structures with optimal dimension of distance.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제25권2호
• /
• pp.1-8
• /
• 2020

In general, the estimation of optimum yield for the radial collector well is determined by the empirical equation or numerical modeling, in which hydraulic conductivity of the aquifer is a main influence factor. Hydraulic conductivities of 164 soil samples collected from boreholes and horizontal wells (average length: about 50 m) installed during well construction in the Anseong stream were drawn in two-dimensional map by the Kriging method and utilized in this study. Hydraulic conductivity analyses by Representative Elementary Count (REC) indicated the average hydraulic conductivity is similar to that of the pumping test when the number of samples reaches about 1,000, which correspond to 1,000 ㎡. Pumping test was also conducted at 1 pumping well and 13 observation wells to estimate hydraulic conductivities at each observation well. REC analysis indicated that the average value of hydraulic conductivity calculated from at least four observation wells is valid as a representative value. The overall result suggested that multiple observation wells or multiple pumping-observation well systems that are located within the range of horizontal wells should be utilized to properly estimate the representative hydraulic conductivity values and the yield of a radial collector well.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 동계학술발표대회 논문집
• /
• pp.405-409
• /
• 2008

Over 70% of the land is mountains in Korea, so that many roadways naturally includes tunnels. The air flow inside tunnel has complex characteristics, such that a new flow field is formed by following vehicles passing through the tunnel before previous flow field is stabilized. Due to these time delayed-transient characteristics, the ventilation facility requires the complex control algorithm that can handle adaptive and predictive controls. Also, it needs to be closely related to the disaster prevention system. The technology to integrate these system determines the success of TGMS. The pollutant levels exhausted from the vehicles passing through tunnel depend on vehicle years and passing velocity. They also depend on the slope and altitude of the tunnel. In order to solve this problem, an algorithm for estimating the compensating factors for calculating on design capacity of ventilation facilities was developed. Also, an integrated ventilation control algorithm with disaster prevention program to operate several tunnels was developed based on TGMS.

• 대한안전경영과학회지
• /
• 제23권3호
• /
• pp.97-102
• /
• 2021

This study developed a scenario to understand the reaction rate and operational time according to RTI value of rate of rise detector in each type in case of fire mattress. In the results of analyzing the reaction rate and operational time of detector in each scenario, in case when installing a single detector, the elevated temperature per minute was raised to 8℃/min ~ 9℃/min. In case when installing two detectors, it was raised to 9℃/min ~ 10℃/min. In case when installing three detectors, it was raised to 10℃/min. The horizontal distance between detector and mattress was 1.8m~2.5m. Whenever the number of detectors was increased, the horizontal distance was decreased. The operational time of detector was within maximum 540 seconds and minimum 420 seconds. As the research tasks in the future, there should be the researches on the effects of reaction rate of detector on the evacuation in case of fire through the result value of RSET by setting up the latency until the detector operates, and the researches on the safety by understanding if the operational time of detector is suitable for the evaluation standard of performance-centered design.

• 한국연안방재학회지
• /
• 제1권4호
• /
• pp.149-155
• /
• 2014

Flexible risers have been used extensively in recent years for floating and early production systems. Such risers offer the advantage of having inherent heave compliance in their catenary thereby greatly reducing the complexity of the riser-to-rig and riser-to subsea interfaces. Another advantage with flexible risers is their greater reliability. Concerns about fatigue life, gas permeation and pigging of lines have been overcome by extensive experience with these risers in production applications. In this paper, flexible riser analysis results were compared through coupled and uncoupled dynamic analyses methods. A time domain coupled analysis capability has been developed to model the dynamic responses of an integrated floating system incorporating the interactions between vessel, moorings and risers in a marine environment. For this study, SPM (Single Point Mooring) system for an FSU in shallow water was considered. This optimization model was integrated with a time-domain global motion analysis to assess both stability and design constraints of the flexible riser system.

• Geomechanics and Engineering
• /
• 제38권2호
• /
• pp.205-214
• /
• 2024

Permafrost refers to the condition where the ground is frozen. It is crucial to review and evaluate the ground's characteristics before construction. In this study, electrical resistivity surveying is chosen as the investigative technique to apply and illustrate the results on the state of permafrost ground and to summarize its applicability. Field experiments are conducted in the Yeoncheon area of South Korea, which has a freezing index of 522.6°C·days. The target area is categorized into two ground conditions: the first where the original ground freezes, and the second involves excavating the original ground up to a depth of 3 meters, backfilling it, and then artificially injecting fluid. Thus, frozen ground conditions are simulated under both natural and artificial circumstances. Electrical resistivity surveys are performed under both above-freezing and sub-zero temperature conditions, with the experiments conducted at sub-zero temperatures revealing relatively more high-resistivity zones due to the temperature conditions. In this area, the distribution of soil moisture content is also investigated using the Time Domain Reflectometry (TDR) technique. It is observed that the ground into which water is artificially injected had a relatively higher moisture content, although the difference is minor. Finally, a 3D map of the target ground is constructed based on the measured electrical resistivity values, and through this, the distribution of porosity, a crucial design parameter, is also depicted. This research demonstrates that the electrical resistivity technique can effectively evaluate the state of frozen and unfrozen ground and further suggests that it can detailed extract the characteristics of the target ground.

• 한국산업보건학회지
• /
• 제30권4호
• /
• pp.364-375
• /
• 2020

Objectives: The purpose of this study is to suggest a direction for consumer-oriented curriculum development by analyzing the priorities of subjects and their preference for educational methods. Methods: The participants included 773 management supervisors and education practitioners in the workplace, and a survey was conducted from April 17 to August 30, 2019. Frequency analysis, t-test, Borich's Needs Analysis, and Locus for Focus Model analysis were performed using Microsoft Excel 2019 and IBM SPSS 21.0. Results: The highest perceived priorities for education subjects were as follows: ① 'CPR and First Aid Practice' and 'Occupational Disaster Prevention and First Aid Basics' in the manufacturing industry; and ② 'Emotional Labor and Job Stress Prevention', 'Occupational Disaster Prevention and First Aid basics, and 'Musculoskeletal Disorder Prevention' in the service industry. 'Collective education' was the most preferred method of education. 'School-type' was preferred for the seating arrangement, and the proper number of trainees was considered to be about 30. Respondents said the contents of the education was a top priority when they applied for education, and curriculum and appropriate textbooks should be considered in calculating the cost of education. Conclusions: Practical subjects and subjects related to major hazards by industry were required for management supervisor education. It was proposed in this study that the contents and operating methods of education be changed so that workers can easily comprehend essential subjects such as the Occupational Safety and Health Act. In conclusion, it is necessary to design the curriculum and apply educational methods suitable for each subject's characteristics in consideration of the priorities for subjects reflected in the needs of trainees.

• 한국강구조학회 논문집
• /
• 제29권6호
• /
• pp.401-410
• /
• 2017

본 연구에서는 긴장재로 계류된 해중 터널에서 긴장재의 느슨해짐에 따른 동적 불안정 거동에 대해 다룬다. 해중 터널의 설계는 파랑 및 조류 등 유체력에 의해 지배받는다. 특히 시간에 따라 지속적으로 크기 및 작용방향이 변하는 파랑은 해중 터널의 동적 거동을 직접적으로 야기하게 되는데, 파랑에 의한 부유 튜브의 운동은 계류선 내력의 동적 변동을 유발하게 되고, 이 힘의 변화는 계류선의 강도설계 뿐 만 아니라 피로 설계에도 직접적인 영향을 미친다. 파랑에 의한 터널의 운동이 극심할 경우, 계류선의 장력은 모두 소실될 수 있는데, 이 때 계류선이 느슨해짐에 따라 일시적으로 부유 터널의 운동에 대한 저항성이 사라져 동적 불안정 거동이 유발 될 수 있다. 이에 본 연구에서는 유체-구조동역학 해석기법을 통해 해중 터널 긴장재의 느슨해짐 발생 시 부유 튜브의 동적 불안정 거동에 대해 분석하였다. 특히 해중터널의 중요 설계 인자인 흘수, 부력-자중 비율(Buoyancy-Weight Ratio, BWR), 긴장재 기울임이 동적 불안정 거동에 미치는 영향에 대해 분석하였다.