• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2002년도 학술.기술논문발표회
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• pp.117-121
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• 2002

The purpose of this study was to Identification the Risk of construction method to protect and reduce the risk of construction period. For this study we are using the pre and during construction period Inspection list. The inspection list was used by construction company for check a flaw of Construction field. So we rearrange the individual item of inspection list to match the Risk factor. This inspection list usually has the difference of importance because this list is not made by Method which is not focused on Method. Therefore, To find the difference of these importance, We surveyed this matter by doing interview of specialist group. To find the application of field and the possibility of measurement of Risk status, We tested Risk occurring frequency and it's strength by checking the level of Risk. The results of this study were as follows; Each Method Check List made out through the rearrangement of Construction Inspection list which used in construction company. To solve and compensate the matter which happened by changing the each Method Check List to each General Inspection List, we added the each Method Check List by checking the importance of check list of each process. By doing this, The Check List for finding Risk level of Method was created by using the check list of each Method.

• 한국건축시공학회지
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• 제2권4호
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• pp.131-135
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• 2002

The purpose of this study was to Identification the Risk of construction method to protect and reduce the risk of construction period. For this study we are using the pre and during construction period Inspection list. The inspection list was used by construction company for check a flaw of Construction field. So we rearrange the individual item of inspection list to match the Risk factor. This inspection list usually has the difference of importance because this list is not made by Method which is not focused on Method. Therefore, To find the difference of these importance, We surveyed this matter by doing interview of specialist group. To find the application of field and the possibility of measurement of Risk status, We tested Risk occurring frequency and it's strength by checking the level of Risk. The results of this study were as follows; Each Method Check List made out through the rearrangement of Construction Inspection list which used in construction company. To solve and compensate the matter which happened by changing the each Method Check List to each General Inspection List, we added the each Method Check List by checking the importance of check list of each process. By doing this, The Check List for finding Risk level of Method was created by using the check list of each Method.

• 한국안전학회지
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• 제30권1호
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• pp.1-7
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• 2015

This study first addresses the ineffectiveness of indirect regulation on industrial machines. Analysis of causes of industrial accidents associated with industrial machines further reveals the fact that technical causes need to be resolved at the manufacturing stage to reduce the frequency and strength of industrial accidents. Balanced safety certification on manufacturers and safety inspection on users of industrial machines are then suggested to effectively resolve such technical causes. The effectiveness of such safety certification and safety inspection can be justified by cost-benefit analysis. Particularly, balance in expected benefits of safety certification and safety inspection is a key issue for validity of such analysis. The accumulated benefit-costs for press brake and portable sawing machine confirm the effectiveness of such safety system.

• 한국안전학회지
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• 제18권1호
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• pp.56-63
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• 2003

During the last decade, effort has been made f3r reducing maintenance cost for aged equipments and ensuring safety, efficiency and profitability of petrochemical and refinery plants. Hence, it was required to develop advanced methods which meet this need. RBI(Risk Based Inspection) methodology is one of the most promising technology satisfying the requirements in the field of integrity management. In this study, a quantitative assessment algorithm fir RBI based on the API 581 code was reconstructed for developing an RBI software. The user-friendly realRBI software is developed with a module for evaluating quantitative risk md financial risk using the potential consequence and the likelihood. Also, inspection planning module for inspection time and inspection method are included in it.

• 한국안전학회지
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• 제21권3호
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• pp.31-37
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• 2006

To apply easily the K-RBI program in domestic industries, an implemental procedure for K-RBI program was prepared. The K-RBI program had been developed, based on API-581 BRD. Therefore, through the usage of the developed K-RBI program and the implemental procedure, industries would have a benefit from reduced costs by modifying a frequency of an inspection efficiently. Also, the reliability of facilities would be maximized through improvement of an inspection method for facilities, considering its risk.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1995년도 가을 학술발표회 논문집
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• pp.344-349
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• 1995

In recent years, the most common bridges are showed a decrease of duriability in quick times of 10~20 years after construction. Therefore, the project of maintenance and management is located a important subject more and more. The maintanence-management of bridges begin from inspection of bridge and this accupy more important part with repairing-reinforcing method. In a point of view liked this, the purpose of this paper is to propose the most rational and useful method for the maintance-management of bridges with comparing and examming inspection kind inspection frequency and judge standard etc. that manage the each organization of Korea and Japan. Also in the bases of this result, hereafter, it will propose the standard idea for the organization etc. of databank of the bridges.

• 한국구조물진단유지관리공학회 논문집
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• 제2권2호
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• pp.170-176
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• 1998

The team mixed PbO, $ZrO_2$, $TiO_2$, $Nb_2O_5$ and $MnCO_3$, to make $Pb[(Zr_{0.54}\;Ti_{0.46})\;Nb_{0.005}]O_3+4%MnCO_3$. The electroded PZT ceramics were poled by 3 kV/mm at $110^{\circ}C$ for 600 s. We assembled the 0.4mm thick PZT slices into ultrasonic transducers. Central frequency of the probe is 5 MHz, which is proper to the thickness gauge for steel pipes and for flaw detector. The probe can detect a disk shape defect of 1mm diameter at 15cm deep in steel block. The new probe's Fresnel zone that the ultrasonic beam do not broaden is 13mm. Over the Fresnel zone, the ultrasonic beam spreads. Half of the beam spread angle of the probe is $4.3^{\circ}-4.6^{\circ}$. This probe can be used for the ultrasonic transducers for non-destructive testing of steel bridges.

• 비파괴검사학회지
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• 제26권2호
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• pp.84-89
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• 2006

레이저 초음파 검사 장치는 레이저빔을 이용하여 초음파 신호를 발생시키고 측정하는 비접촉식 결함 검사 장치이다. 이 장치는 펄스 레이저빔을 이용하여 광대역 주파수 범위를 갖는 초음파 신호를 발생시키고 작은 점으로 집속된 측정용 레이저빔을 이용하여 초음파 신호를 측정하므로 우수한 측정 분해능을 제공한다. 본 논문에서는 레이저 초음파의 표면파를 이용하여 표면 결함의 깊이를 측정하는 기법에 대한 연구를 수행하였다. 표면 결함은 깊이가 깊어질수록 차단 주파수 값이 작아지는 저주파 통과 필터 역할을 한다. 그리고 결함을 통과한 초음파 신호의 중심 주파수 값은 결함의 깊이에 따라 반비례적으로 작아진다. 본 논문에서는 표면 결함의 정규화 된 전달함수를 구한 다음 주파수 감쇠 성분을 이용하여 표면 결함의 깊이 정보를 추출하였고 표면 결함을 통과한 레이저 초음파 신호의 중심 주파수 값을 이용하여 결함의 릴이 정보를 추출하였다. 제안된 표면 결함 깊이 측정 방법은 초음파의 진폭 변화에 의한 결함 깊이 측정법보다 더욱 정밀한 정보를 제공하였다.

• 상하수도학회지
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• 제30권6호
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• pp.623-634
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• 2016

Sewer condition assessment involves the determination of defective points and status of aged sewers by a CCTV inspection according to the standard manual. Therefore, it is important to establish a reliable and effective standard manual for identifying the sewer defect. In this study, analytic reviews of the CCTV inspection manuals of the UK, New Zealand, Canada and South Korea were performed in order to compare the defect codes and the protocols of condition assessment. Through this, we also established the standardized method for defect code and revised the calculation method of assigning the condition grade. Analyses of the types and frequencies of sewer defects that obtained by CCTV inspection of 7000 case results, showed that the joint defect and lateral defect were the most frequent defects that occurred in Korea. Some defect codes are found to be modified because those did not occur at all. This study includes a proposed new sewer defect codes based on sewer characteristics.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1097-1098
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• 2011