• Title/Summary/Keyword: 구조 안전 진단

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An analysis on the relative importance of aptitude test items for integrated pilot aptitude evaluation (종합적 조종적성 판단을 위한 적성 검사 항목의 상대적 중요도 분석)

  • 유희천;이달호;김영준
    • Proceedings of the ESK Conference
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    • 1993.10a
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    • pp.46-55
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    • 1993
  • 조종사가 수행하는 조종 업무는 여러 정보를 동시에 지각하여 처리하여 야 하는 복잡한 작업으로 구성되어 있어, 조종사에게는 고도의 인간성능이 요구되고 있다. 또한 조종기술을 습득하기 위해서는 많은 훈련시간과 비용 이 소요되며, 조종사의 실수는 치명적인 사고를 초래한다. 따라서 조기에 비행 부적격자를 판별하고, 미흡한 조종 적성을 함양시킬 수 있는 교육 . 훈련 프로그램을 조종 후보생에게 적용시키는 분석적 조종적성 진단 체계 개발은 조 종사의 도태율 감소, 효율적인 비행훈련, 비행 안전사고 감소 등의 측면에서 절실하게 요구되고 있다. 본 연구에서는 조종 업무 수행시 요구되는 여러 인간 기능의 중요도 차이를 조종 적성 평가 체제에 적용하기 위해서, 각 적성 검사 항목들의 상대적 중요도를 분석하고 이의 타당성을 평가하였다. 적성검사 항목의 상대적 중요도 분석은 조종적성검사 계층구조의 각 수준별 쌍체 비교 평가와 AHP(Analytic Hierarchy Process) 분석에 의한 상대적 중요도 산출 및 평가, 그리고 일관성 지수(Consistency Index)에 의한 분석 결과의 조정을 통해 이루어 졌다. 적성검사 항목의 쌍체 비교 평가는 심리기능검사, 비행자질 검사 등 총 29개 적성검사 항목에 대해 검사를 받았고 또한 초등비행 훈련과정을 수료한 조종 학생들에 의해 이루어 졌다. 상대적 중요도를 분석한 결과 심리기능 검사(W=0.30)가 다른 검사에 비하여 조종적성 평가에 중요한 검사로 나타났으며, 세부 항목으로는 주의 분배력(W=0.13), 추적능력(0.06) 등이 상대적으로 중요한 검사 항목으로 나타났다. 또한 상대적 중요도 결과를 적용한 적성검사 성적이 적용하지 않은 적성검사 성적에 비해 비행성적에 대한 예측 능력이 좋은 것으로 평가되었다.al age)가 있다는 것을 의미하는 것이다. 한편, 생산현장에서는 자동화, 기계화가 진보되어 육체적인 노동이 경감된 결과, 중고령자라도 할 수 있는 작업이 많아지고 있다. 또, VDT (Visual Dislay Terminal) 작업과 같은 정보처리 작업의 수요가 증가하여 그 인재의 부족이 지적되고 있다. 따라서 중고령자의 기능을 조사하여 어떠한 작업에 적합한가를 판단하는 것이 중요한 과제로 되었다. 그러나 노동에는 많은 기능이 관여 하고, 그 내용에 따라서 요구되는 기능이 서로 다르기 때문에 노동적응능력의 기본적인 기능으로 보여지는 것에 좁혀서 작업능력의 연령증가 변화에 대하여다원적 평가를 하는 것이 실제적이라고 할 수 있다. 따라서 본 연구에서는 인간이 가지고 있는 다수의 기능중에서 수지교 치성과 연령증가와의 관계를 조사한다. 만약 연령증가 만으로 수지교치성을 평가 할 수 없는 경우에는 어떠한 요인이 수지기민성의 변화에 영향을 미치는가를 검토한다.t list)에서 자동적으로 사건들의 순서가 결정되도록 확장하였으며, 설비 제어방식에 있어서도 FIFO, LIFO, 우선 순위 방식등을 선택할 수 있도록 확장하였다. SIMPLE는 자료구조 및 프로그램이 공개되어 있으므로 프로그래머가 원하는 기능을 쉽게 추가할 수 있는 장점도 있다. 아울러 SMPLE에서 새로이 추가된 자료구조와 함수 및 설비제어 방식등을 활용하여 실제 중형급 시스템에 대한 시뮬레이션 구현과 시스템 분석의 예를 보인다._3$", chain segment, with the activation energy of carriers from the shallow trap with 0.4[eV], in he amorphous regions.의 증발산율은 우기의 기상자료를 이용하여 구한 결과

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A Study on the Application Method of Facility Classification System for the Development of Asset Management System for Power Generation Structures (발전구조물의 자산관리 시스템 구축을 위한 시설물분류체계 활용방안에 관한 연구)

  • Jeon, Seokhyeon;Jeong, Jeongsik;Ahn, Jinhee;Kim, Changhak
    • Korean Journal of Construction Engineering and Management
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    • v.20 no.2
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    • pp.113-118
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    • 2019
  • Recently, the maintenance concept of infrastructure has been changed from the stability management of the structure determined by the safety inspection of the existing facilities to the asset management related to evaluating and managing the performance of the facilities. For management of the property of the facilities, it is necessary to efficiently classify their information for the maintenance and service level of the facilities and to manage them. In the case of power plant facility, especially, it is a complex structure, which is constructed in a various component and detail. In this study, therefore, the components of power plant facility were classified into facilities, spaces, parts, and elements considering the type of integrated construction classification system in Korea. To reflect the deterioration rate of the facility in accordance with environmental conditions such as airborne salt and humidity etc., it was classified by adding direction, interior, and exterior condition of each component not to be considered in the existing classification system for its effective and systematic maintenance, since it is generally located in the coastal area due to the operation of the power generation structure. The classification system developed in this study can be used as fundamental data for development of the computer system for asset management of power plant facility.

Load Carrying Capacity Assessment of Bridges with Elastic Supports Application (탄성지점의 적용에 따른 교량의 내하력평가)

  • Yang, Seung-Hyun
    • Journal of Korean Society of Steel Construction
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    • v.24 no.5
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    • pp.595-603
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    • 2012
  • This study applied elastic supports in order to evaluate load carrying capacity using measurement data obtained from load tests actively and utilizing various evaluation methods. In order to confirm the adequacy of structural analysis based on elastic supports and to improve the reliability of experiment results, we conducted a deflection test with flexural beams prepared as overhanging beams and, based on the results, performed precision safety diagnosis for real bridges under public service for improving the load carrying capacity evaluation method for bridges under public service. In the results of the bending test, compared to deflection calculated by the existing method, deflection obtained by applying elastic supports was closer to the actually measured deflection. In the results of evaluating load carrying capacity for a 3 span continuous steel box girder bridge just after its completion, load carrying capacity by elastic supports was smaller by up to 39% than that by the existing method. When the load carrying capacity of bridges is evaluated by the existing method the results vary among engineers due to lack of guidelines for evaluation such as the application of stress modification factor. This study was conducted as an effort to solve this problem through active research.

An Experimental Performance Evaluation with Xenomai for WSN (WSN을 위한 Xenomai의 실험적 성능평가)

  • Son, Tae-Yeong;Rim, Seong-Rak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.1
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    • pp.709-714
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    • 2017
  • Structures like bridges or buildings need to be checked continuously to diagnose their safety. However, it is extremely difficult for the people who access such structures to check all areas directly. To overcome this problem, there is a lot of active research into structural health monitoring (SHM) with wireless sensor nodes (WSNs). In this paper, for more accurate checking of SHM with WSNs, we experimentally compare and evaluate the performance of Xenomai, which provides real-time processing under the traditional Linux kernel. For this purpose, we patch Xenomai into the traditional Linux kernel of a commercial embedded board, Raspberry Pi, and implement a task that periodically reads vibration data of the z-axis from an accelerometer in order to analyze the natural frequency of cantilever beams. Reading the data from the traditional Linux kernel with the same method, we analyze the natural frequency of the cantilever beams using Smart Office Analyzer. Finally, to review the validity of Xenomai for WSNs, we obtain vibration data on the z-axis from the accelerometer via wired network and compared and analyzed them the same way.

Development of Precision Positioning and Fine Displacement Monitoring Based on GNSS (GNSS 기반의 정밀측위 및 미세변위 모니터링 개발)

  • Yeon, Sang-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.3
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    • pp.145-152
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    • 2017
  • In this paper, GNSS(global navigation satellite system) to monitoring the fine for the construction of structure displacement based on satellite communications signals of GNSS. At the same time on USN(ubiquitous sensor network) and proposed a new approach to precise positioning by analyzing the results. A major construction structure for the safety diagnosis and prevent disaster from the risk of collapse. Precision measurement methods to mm level GNSS in that case and experiments in the application of new technologies that can most commonly used to replace the current through the permanent. The way a GNSS baseline and tested it on to prove. As a result, at our country at precise positioning and fine displacement monitoring application virtual reference station(VRS) in a GNSS mm of a margin of error of horizontal and vertical directions can be found.

A Case Study on the Improvement Plan for Cost Prediction of Educational BTL Project based on Running Cost Analysis (교육시설 BTL사업의 유지관리비용 비교분석을 통한 비용추정 개선방안에 관한 사례연구)

  • Park, Moon-Sun;Song, Chang-Youg;Kim, Yong-Su
    • Korean Journal of Construction Engineering and Management
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    • v.8 no.6
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    • pp.139-149
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    • 2007
  • The purpose of this study is to examine the problem of BTL(Build Transfer Lease) projects through comparative analysis on running costs, focusing on primary school, junior and senior high school education facilities, and then to provide useful information on the estimation of running costs by suggesting valid cost criteria. For this, eight schools from A and B consulting firms were sampled from capital region and other areas. Sampled schools were classified into four categories according to school grade, and running cost data are collected and analyzed from relative view points. The results of this study are as follows: 1) running costs which are analyzed by categories show some difference among sub-items, 2) major problems related to running cost prediction of BTL projects are revealed and improvement schemes are suggested for two groups (Owner and Project applicants).

Evaluation Model of the Contracting Company's Security Management Using the DEA Model (DEA 모형을 이용한 도급회사 보안관리 평가모델)

  • Kim, In-hwan;Lee, Kyung-ho
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.27 no.3
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    • pp.687-704
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    • 2017
  • As Korea's industrial competitiveness and technological prowess increase, collaboration and technical exchanges with contracting companies are increasing. In an environment where cooperation with the contracting company is unavoidable ordering companies are also striving to prevent leakage of technologies through various security systems, policy-making and security checks. However, although the contracting companies were assessed to have a high level of security management the leakage of technical datas are steadily increasing. Issues are being raised about the effectiveness of the security management assessment and the actual security management levels. Therefore, this study suggested a security management system model to improve security management efficiency in the general contract structure. To prove this, analyze the efficiency of 36 contractor companies for the technical datas security management system using the DEA model. The results of the analysis are reflected in the assessment results. Lastly, suggestions for improving the effectiveness of the technical datas security system are proposed.

Evaluation of Micro Crack Using Nonlinear Acoustic Effect (초음파의 비선형 특성을 이용한 미세균열 평가)

  • Lee, Tae-Hun;Jhang, Kyung-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.4
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    • pp.352-357
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    • 2008
  • The detection of micro cracks in materials at the early stage of fracture is important in many structural safety assurance problems. The nonlinear ultrasonic technique (NUT) has been considered as a positive method for this, since it is more sensitive to micro crack than conventional linear ultrasonic methods. The basic principle is that the waveform is distorted by nonlinear stress-displacement relationship on the crack interface when the ultrasonic wave transmits through, and resultantly higher order harmonics are generated. This phenomenon is called the contact acoustic nonlinearity (CAN). The purpose of this paper is to prove the applicability of CAN experimentally by detection of micro fatigue crack artificailly initiated in Aluminum specimen. For this, we prepared fatigue specimens of Al6061 material with V-notch to initiate the crack, and the amplitude of second order harmonic was measured by scanning along the crack direction. From the results, we could see that the harmonic amplitude had good correlation with COD and it can be used to detect the crack depth in more accurately than the common 6 dB drop echo method.

Calibration and Estimation of Parameter for Storage Function Model (저류함수모형의 매개변수 보정 및 추정)

  • Kim, Bum Jun;Kawk, Jae Won;Lee, Jin Hee;Kim, Hung Soo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.1B
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    • pp.21-32
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    • 2008
  • Flood forecasting is a very important tool as one of nonstructural measures for reduction of flood damages in life and property and its accuracy is also an important factor. However, when we apply the Storage Function Model(SFM) which is mainly used for the flood forecasting system in Korea, the determination of the parameters is very important but it is difficult. So, the parameters have been calibrated by using an empirical formulas and judgement of hydrologist. Hence, in this study we perform the sensitivity analysis to understand the parameter characteristics and establish the ranges of parameters of the SFM. Also we do the parameter calibration by using the optimization techniques and objective functions, and evaluate their performances. Especially, we suggest a method to determine proper parameters by using a objective function which can be obtained from flood events. So, we use the suggested method for parameter estimation and compare the estimated parameters with the previously reported parameters. As a result of the application, the estimated parameters by the suggested method showed better than them from the previously reported parameters.

A Study on the Formation and Development of Collective Security System and the Possibility of Security System Shift in East Asia (집단안보체제의 형성 및 발전요인과 동아시아 안보체제의 변화 가능성 연구)

  • Oh, Dongkeon
    • Maritime Security
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    • v.7 no.1
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    • pp.1-29
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    • 2023
  • For the last 70 years, the U.S.-led bilateral security system, or "Hub-and-Spokes" system, has been applied to Northeast Asia, and the system has been successfully settled in terms of stability and economic achievements of the region. Given the increasing complexity of the security environment of East Asia, it is plausible to consider the possibility of a security system shift from bilateral alliances to collective security. In order to analyze the driver of collective security system, this study developed three factors of formation and development of collective security system - main threat, intensity of the threat, and confidence among countries in the system - by reviewing international political theories related to security cooperation. Comparing the formation, development, and achievements of NATO and SEATO, the study figures out that the existence of the main threat, the high intensity of the threat, and the strong confidence among countries in the security system are the primary drivers for a successful collective security system. Based on the result, the study also analyzed the possibility of a security system shift in East Asia. Considering contemporary international conflicts such as U.S.-China strategic competition, Russia-Ukraine War, and growing threats posed by North Korean nuclear and missiles, the study anticipates that the necessity of a collective security system that will replace the current security system of the region would arise. Still, although some issues between countries should be overcome, the growing intensity of the threats will promote cooperation among countries by improving their confidence.

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