• 문화기술의 융합
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• 제5권3호
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• pp.43-54
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• 2019

이 연구는 아파트 화재의 대형화를 막기 위해 소방공사감리원의 업무수행능력에 따른 완공검사결과와 소방공사감리원의 성능시험 공기확보의 필요성에 따른 완공검사결과 및 완공검사증명서 발급 후 소방시설 등의 하자 유무상태에 따른 요인을 분석하여 완공검사 결과를 측정하여 소방공사감리원의 업무수행능력을 향상시키 위한 것이다. 연구의 결과를 요약하면 첫째, 소방공사감리원의 업무수행능력에 따라 아파트 완공검사결과에 영향을 미치는 것으로 직업별로 소방공무원보다 소방시설설계업 및 소방공사감리업 종사자가 소방공사감리원의 업무수행능력에 따라 아파트 완공검사 결과 정도는 유의하게 높게 나타났다. 그러므로 아파트에는 아파트 공사감리 경력이 있는 사람을 감리원으로 배치하여 소방공사감리원의 업무수행능력을 향상시킬 필요가 있다. 둘째, 소방공사감리원의 성능시험 공기확보 필요성에 대한 완공검사 결과는 직업별로 소방공무원보다 소방시설설계업 및 소방공사감리업 종사자의 성능시험에 대한 공기확보 필요성이 유의하게 높은 것으로 분석 되었다. 이를 개선하기 위해 건축 준공일까지 완공검사를 할 수 있도록 하며 발주처에서는 완공검사증명서를 건축준공일에 임박하여 발급받도록 강요하지 않도록 장치를 마련할 필요가 있다. 마지막으로, 완공검사증명서 발급 후 완공검사의 하자가 완공검사 결과에 영향을 미치는 것으로 발주자(건축주. 감독관) 종사자보다 소방시설설계업 및 소방공사감리업체 종사자가 유의하게 낮게 분석되었다. 이는 소방시설공사를 마치지 않은 상황에서 발주처. 건설사가 완공검사증명서의 발급을 요구함에 따라 완공검사증명서 발급 후 소방시설 등에 하자가 발생하여 완공검사 결과에 영향을 미친 것으로 분석된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.157-158
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• 2019

Reinforcing bars are an important material for tensile strength of structures. For this reason, the inspection of the reinforcing bars confirming the layout and omission is very important for the safety of the structures. However, the current method of inspecting of the reinforcing bars through photographs of specific areas is difficult to identify condition all reinforcing bars. And It is also difficult to confirm after completion of a building. Therefore, reinforcing bar inspection using 3D scanner is required for automation of rebar inspection and database construction. For this purpose, this study test application of automated inspection method for rebar inspection using 3D scanner and discuss the effect of this method.

• 한국경영과학회지
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• 제21권1호
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• pp.115-129
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• 1996

A reliability Acceptance Sampling Plan (RASP) is developed for testing the exponential mean lifetime under the periodic (i. e., equally-spaced) inspection and Type I censoring. Under the periodic inspection, the exact sampling distribution of maximum likelihood (ML) estimator of mean can not be derived. Hence sample size and acceptance criterion are determined by the algorithm proposed on the basis of Monte Carlo simulation such that the producer's and consumer's risks are satisfied for given censoring time and number of inspections. In addition, the developed RASP is compared in terms of sampling size, OC curve, and expected completion time. The effects for the RASP by the chosen inspection scheme are also discussed.

• 한국지진공학회논문집
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• 제27권6호
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• pp.331-337
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• 2023

Due to the aging of a building, 38.8% (about 2.82 million buildings) of the total buildings are old for more than 30 years after completion and are located in a blind spot for an inspection, except for buildings subject to regular legal inspection (about 3%). Such existing buildings require users to self-inspect themselves and make efforts to take preemptive risks. The scope of this study was defined as the general public's visual self-inspection of buildings and was limited to structural members that affect the structural stability of old buildings. This study categorized possible damage to reinforced concrete to check the structural safety of buildings and proposed a checklist to prevent the damage. A damage assessment methodology was presented during the inspection, and a self-inspection scenario was tested through a chatbot connection. It is believed that it can increase the accessibility and convenience of non-experts and induce equalized results when performing inspections, according to the chatbot guide.

• 대한토목학회논문집
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• 제37권1호
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• pp.19-28
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• 2017

이 논문에서는, 1996년부터 2010년까지 915개 고속도로 교량에 대해 실시된 정밀안전진단 보고서를 수집하여 이들 교량의 상태를 분석하였다. 분석시 손상을, 결함, 물리력 및 열화에 의한 손상으로 구분하여 손상이 많이 발생하는 시기를 조사하고, 유손상율의 개념을 도입하여 손상의 특징을 조사하였으며, 고속도로 교량의 10대 손상, 다설한랭지역 교량과 일반지역 교량의 열화특성을 비교하여 합리적인 점검활동 개선 방향을 제시하였다. 연구결과, 시공시 실시하는 점검 또는 초기점검 제도 개선이 필요하고, 다설한랭지역의 경우 열화진행 속도가 빠르므로 주변 환경의 특성을 고려한 점검 활동 개선이 필요한 것으로 판단되었다. 이 연구 결과는 향후 고속도로 교량의 점검 활동 개선을 위해 널리 활용될 수 있을 것이다.

• 대한기계학회논문집A
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• 제26권12호
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• pp.2598-2604
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• 2002

Robots that can move along the narrow and rough tube are very important as the request for the inspection increases. It is necessary for the inspection robots to have a capability to move successfully at even overturned situation and have a simple mechanism to reduce the unexpected failure possibility fer the successful completion of the given mission. Through this paper, the authors propose a novel and simple mechanism using a combination cam device to generate the locomotive motion of multi-legs. This robot uses one DC motor and one combination cam shaft to generate the locomotive motion and can move rough tubes without failure even at the overturned situation. The robot also shows enough fragging force fer the connected line that is very important for a wired inspection robot. Kinematics analysis to design the specification of the robot will be followed and several applications show this robot's potential capabilities.

• 대한기계학회논문집A
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• 제30권1호
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• pp.90-96
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• 2006

Since Risk Based Inspection(RBI) was introduced to quality the risks for jet engine and nuclear power, the technique has been expanded to the area of petrochemical plant. Recently among USA and Europe, window-based computer programme for RBI has been rapidly developed. When local companies procure such program to apply to their plants, it is difficult to build up a proper database as well as expect a good result. In this regards, K-RBI programme accustomed to Korean environments was developed. After completion of the programme in 2004, it was tested by 2 local petrochemical plants and was produced fruitful results. By using these programme, we are expecting accident prevention through risk based planning and implementing of equipment inspection, and saving dollars caused by procuring foreign expensive programme.

• 한국경영과학회지
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• 제22권1호
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• pp.123-140
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• 1997

In this paper we consider closed flow line systems with samploing inspections. The total number of parts in the system is assumed to be N. The processings carried out of each station do not always meet the requirement of quality. Therefore, upon completion of its processing at each station, a part is inspected to determine whether the processings meet the requirement of quality or not. We assume that inspection are done on a random basis. If a part is found to be defective by an inspection, it is fed back to the apropriate station. Two different cases will be considered in this study : a three-station flow line system with infinite buffers and a two-station flow line system with finite buffers. For each case, we will develop an exact method to obtain the performance measures such as throughput, machinen utilization, average outgoing quality and manufacturing lead time. For the case of the two-station flow line system ith finite buffers, we will also develop an approximation method using a stage-aggregation technique. Then using buffers, we will also develop an approximation method using a stage-aggregation technique. Then using these results, we will try to find an optimal inspection policy which maximizes the expected net profit under a certain cost structure. Although we present the results only for the two or three station flow line system in this paper, the results obtained in this paper can be extended easily to the system which consists of more than two or three stations.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2003년도 춘계공동학술대회
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• pp.208-216
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• 2003

ISO 14649 (data model for STEP-NC) is a new interface scheme or language for CAD-CAM-CNC chain under established by ISO TC184 SCI. Up to this point, the new language is mainly made for milling and turning, and other processes such as EDM will be completed in the future. Upon completion, it will be used as the international standard language for e-manufacturing paradigm by replacing the old machine-level language, so called M&G code used since 1950's. With the rich information contents included in the new language, various intelligent functions can be made by the CNC as the CNC knows what-to-make and how-to-make. In particular, On-Machine Inspection required for quality assurance in the machine level, can be done based on the information of feature­based tolerance graph. Previously, On-Machine inspection has been investigated mainly for milling operation, and only a few researches were made for turning operation without addressing the data model. In this thesis, we present a feature-based on-machine inspection process by the 4 Tasks: 1) proposing a new schema for STEP-NC data model, 2) converting the conventional tolerance scheme into that of STEP-NC, 3) modifying the tolerance graph such that the tolerance can be effectively measured by the touch probe on the machine, and 4) generating collision-free tool path for actual measurement. Task 1 is required for the incorporation of the presented method in the ISO 14649, whose current version does not much include the detailed schema for tolerance. Based on the presented schema, the tolerance represented in the conventional drafting can be changed to that of STEP-NC (Task 2). A special emphasis was given to Task 3 to make the represented tolerance accurately measurable by the touch probe on the machine even if the part setup is changed. Finally, Task 4 is converting the result of Task into the motion of touch probe. The developed schema and algorithms were illustrated by several examples including that of ISO 14649 Part 12.

• 대한안전경영과학회지
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• 제23권4호
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• pp.23-29
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• 2021

The purpose of this study is to reduce the probability of occurrence of electric fires as a preemptive preventive measure, and to strengthen the capability of preventing electric fires by strengthening the cooperative function between electric fire-related departments and establishing a cooperative system. In this study, the general aspects of electric fires were identified by reviewing the literature such as ignition mechanisms of electric fires. And the major electrical fires that occurred in the last 10 years were classified into ignition factors (short circuit, overload/overcurrent, and earth leakage/ground fault) and ignition sources (wiring/wiring appliances, electrical equipment/household appliances). And the 4M technique was used to analyze the potential causes of ignition at the fire site and to suggest preventive measures. In the case In this study, out of 48 electrical fires in the past 10 years, 16 short-circuit fires, 3 overload/overcurrent fires, 3 short-circuit and earth fault fires, 16 fires in wiring/wiring appliances, and 10 fires in electrical equipment/home appliances classified as cases. And prevention measures were presented in terms of human, machine, media, and management by using the 4M technique. For the preemptive prevention of electric fires, strengthening the compulsory electrical safety inspection and making it mandatory to report when new or expanding electric facilities, charging a fee for electric safety inspection for detached houses and granting benefits subject to inspection completion, improvement of the electric safety voluntary inspection table and safety indications; It was suggested as a policy to organize and operate electrical safety inspection personnel in a two-person team (mixed), establish a close work cooperation system with related organizations, and strengthen electrical safety education and publicity.