• Title/Summary/Keyword: Inspection Period

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Analysis of △△ Guided Missile Inspection Period Based on Storage Reliability (저장신뢰도 기반의 △△ 유도탄 검사주기 분석)

  • Jeong, Sang-hun;Lee, Sangbok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.592-598
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    • 2017
  • The purpose of this study is to suggest a new inspection period of ${\triangle}{\triangle}$ guided missiles by analyzing their reliability using field data. The ${\triangle}{\triangle}$ guided missile has an inspection period of five years which was determined using prediction data during its development process. However, from the analysis of its field data, it was shown that the inspection period could be extended to more than 18 years. Based on this result, a policy is proposed to reevaluate the inspection period by means of practical reliability tests.

Optimal Inspection Period for the System Subject to Random Shocks

  • Kim, Sung-Soon;Choi, Seung-Kyoung;Lee, Eui-Yong
    • Journal of the Korean Data and Information Science Society
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    • v.16 no.4
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    • pp.725-733
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    • 2005
  • A system subject to random shocks is considered. The shocks arrive according to a Poisson process and the amount of each shock is exponentially distributed. In this paper, a periodic inspection policy for the system is compared with a random inspection policy. After assigning several maintenance costs to the system, we calculate and compare the long-run average costs per unit time under two policies.

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Integration of Construction Inspection to Schedule Management (공정관리와 연계한 건설 검측 업무 체계화 방안)

  • Song, Bohyeon;Jeong, Seunghwan;Lee, Jin Gang;Choi, Jaehyun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.161-162
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    • 2023
  • The construction inspection is conducted by the contractor or construction supervisor after a certain stage of work has been completed. As the consturction inspection task is dependant on construction schedule, however, it is difficult to plan inspection task systematically, resulting in increased supervision costs, delays in construction, and disputes. Therefore, this study aims to integrate inspection work with schedule management to systematize inspection procedures. Firstly, the inspection work is defined based on the construction supervision checklist. Then its relationship with the construction process, required time, and resources for inspection tasks are defined in construction schedule. Lastly, a process management program is used to assess the effects of applying the inspection work and examine changes in the overall construction period and process management. The proposed method in this study can support to plan construction inspection more systematically and to improve the effectiveness of construction quality management.

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Epidemiological characteristics of bovine brucellosis in Korea, 2000~2004

  • Nam, Hyang Mi;Yoon, Hachung;Kim, Cheol-Hee;More, Simon J.;Kim, Seok-Jae;Lee, Byeong-Yong;Park, Choi-Kyu;Jeon, Jong-Min;Wee, Sung-Hwan
    • Korean Journal of Veterinary Research
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    • v.52 no.1
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    • pp.19-24
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    • 2012
  • This paper describes the epidemiological characteristics of bovine brucellosis in Korea during January 2000~September 2004, which encompasses the period when the incidence of bovine brucellosis increased abruptly. Data from the National Animal Infectious Disease Data Management System were used for this study. A range of epidemiological measures was calculated including annual herd and animal incidence. During the study period, there were 1,183 outbreaks on 638 farms. In beef cattle, annual herd incidence increased from 0.2 (2000) to 11.5 (2004, to September) outbreaks per 10,000 and annual animal incidence varied between 3.4 (2000) and 105.8 (2004, to September) per 100,000, respectively. On 401 (62.9%) infected farms during this period, infection was eradicated without recurrence. Recurrence of infection was significantly higher on farms where abortion was reported (53.3%), compared to farms where it was not (30.0%). On beef cattle farms, infection was introduced most frequently through purchased cattle (46.2%). Based on the results of this study, the establishment and spread of brucellosis in the Korean beef cattle population were mainly due to incomplete or inappropriate treatment of aborted materials and the movement of infected cattle.

A Improvement Plan for Inspection Method about the Urban Railway Facilities and Cycle (도시철도 시설물 점검 방법 및 주기 개선방안 - 궤도시설물 점검 중심으로 -)

  • Moon, Deuk-Soo;Chang, Byung-Chul;Koo, Ja-Kyung;Lee, Tai-Sik
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.243-248
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    • 2008
  • Seoul subway is an safety, quick, and clean public transportation to secure citizens safety. One of the most important elements of train is optimizing railroad function and need to conform railroad inspection for function maintenance. Railroad is the most biggest part of the railroad facility and it is a structure which requires sustainable maintenance. The purpose of study is to improve domestic metropolitan railroad facility inspection method and period. For this, we refer documents about present roving method, roving members and period of railroad roving. In addition, analyzed problems of railroad roving investigation method and period by examining the type and standards of railroad investigation and interviewing experts. By this, we analyzed improving plan and expectations of railroad maintenance and repair operation.

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A Study on the Risk Analysis of Construction Method (건축공법 내부 리스크 분석에 관한 연구)

  • 윤여완;양극영
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2002.11a
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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.

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A Study on the Risk Analysis of Construction Method (건축공법 내부 리스크 분석에 관한 연구)

  • Yoon, Yer-Wan;Yang, Keek-Young
    • Journal of the Korea Institute of Building Construction
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    • v.2 no.4
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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.

A Study on the Development of Work Activity Check List by Factor Analysis (요인분석을 통한 공종별 체크리스트 작성에 관한 연구)

  • 이재옥;윤여완;김천학;양극영
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2002.11a
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    • pp.95-98
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    • 2002
  • The purpose of this study was to Estimation 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, The results of this study were as follows: The inspection list was rearranged at Risk checklist for Risk estimation. So that we estimate the Risk of individual construction method.

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The Evaluation of Inspection Period based on Reliability in Railway Traction Power Systems (철도급전시스템의 신뢰도기반 점검주기 산정)

  • Kim, Hyungchul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.8
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    • pp.1177-1183
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    • 2013
  • In this paper, the analysis of inspection period bases on reliability is suggested in the field of traction power system. Even though there are several maintenance models, the most commonly used maintenance assessment has been focused on time based maintenance in real traction power systems. The maintenance intervals are selected on the basis of long-time experience. It ensures high availability and exact planning of staff. Reliability centered maintenance, which evaluates criticality and severity of each failure mode, achieves the operation, maintenance, and cost-effective improvement that will manage the risks of equipment. This paper deals with electrification in railway inspection frequency and applied reliability based inspection frequency instead of constant intervals. The distribution function of failure rate in traction power system belongs to Weibull function. Also, the fault data and the number of installed equipments for electrifications are collected. The failure history is investigated and classified in detail. Though these complicated procedures, it contribute to extend equipment lifetime and to reduce maintenance costs.

A Study of Optimal Maintenance Schedules of a System under the Periodic Inspection Policy (주기적인 검사 정책하에서 최적예방 교체시기 결정에 관한 연구)

  • 정현태;김제승
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.20 no.44
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    • pp.263-271
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    • 1997
  • This paper presents a preventive maintenance model for determining the preventive replacement period of a system in which a failure rate is affected by the cumulative damage of fault and inspection. Especially, the failure rate function is considered to be a function of the cumulative damage of the fault and inspection time. Types of replacement considered are preventive replacement and failure replacement. Failure rate and expected cost function between replacement are derived. An optimal policy is obtained that minimizes the average cost per unit time for preventive replacement, failure replacement, inspection and repair.

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