• 대한전자공학회논문지
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• 제20권6호
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• pp.29-32
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• 1983

본 논문은 작년도 국책 과제의 하나인 "16 bit 따이크로컴퓨터 개발"에서 개발친 16bit 마이 크로컴퓨터를 위한 주기억 시스템 개발에 관하여 기술한다. 이 주기억 시스템은 ECC 기능을 갖고 있으au IEEE-796 bus를 이용했다. 설계과정에서는 top-down 방식을 따랐으며 시험과정에 bottom-up 방식을 따랐다. 이렇게 해서 개발된 기억 보오드는 미국에서 시판되고 있는 것보다도 좋은 성능을 발휘했으며 가격도 저렴하다.

• Structural Engineering and Mechanics
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• 제81권5호
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• pp.647-664
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• 2022

The powerful data mapping capability of computational deep learning methods has been recently explored in academic works to develop strategies for structural health monitoring through appropriate characterization of dynamic responses. In many cases, these studies concern laboratory prototypes and finite element models to validate the proposed methodologies. Therefore, the present work aims to investigate the capability of a deep learning algorithm called Sparse Autoencoder (SAE) specifically focused on detecting structural alterations in real-case studies. The idea is to characterize the dynamic responses via SAE models and, subsequently, to detect the onset of abnormal behavior through the Shewhart T control chart, calculated with SAE extracted features. The anomaly detection approach is exemplified using data from the Z24 bridge, a classical benchmark, and data from the continuous monitoring of the San Vittore bell-tower, Italy. In both cases, the influence of temperature is also evaluated. The proposed approach achieved good performance, detecting structural changes even under temperature variations.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2004년도 춘계학술대회
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• pp.137-148
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• 2004

This study analyzes the process of informatization in the public sector for information system development using Peter Keen's Process Capability Matrix. For this, Informatization Support Project, a model case of informatization process in the public sector, is analyzed by the approach from a traditional point of view to the viewpoint of e-business By doing this, the direction of BPR for informatization in the public sector will be presented. Moreover, implications for the direction of the outsourcing will be provided.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2143-2145
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• 2002

This paper proposes the control problem of an inverted pendulum system based on adaptive fuzzy sliding mode. The universal approximating capability, learning ability, adaptation capability and disturbance rejection are collected in one control strategy. The proposed scheme does not require an accurate dynamic model and the joint acceleration measurement, yet it guarantees asymptotic trajectory tracking. Experimental results perform with an inverted pendulum to show the effectiveness of the approach.

• 시스템엔지니어링학술지
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• 제4권2호
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• pp.55-61
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• 2008

In this paper, there is the case study which assesses the systems engineering capability maturity of the safety organization that performs the Railway Safety project using systems engineering method. To In ore effective and efficient a research and development to railway safety domain, a new research and development method can be progressively needed such as systems engineering. To assess quantitatively research of systems engineering efforts in the railway safety project, SECM(EIA/IS 731) Standard is utilized in the paper. It is by questionnaire that the capability maturity assessment is executed wit h the safety organization and staffs who performs the systems engineering activities; requirement analysis and management, interface control management. product verification and validation, and so on. As a result, the systems engineering capability level of the safety organization rises from 0 level at the initial project to 2 level after two years and all staffs give an affirmative answer about the importance and effectiveness of the systems engineering approach.

• Asian Journal of Business Environment
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• 제8권2호
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• pp.33-41
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• 2018

Purpose - This study aims to examine the determinants of income management of the public servant. Three independent variables are examined such as attitude towards money, financial capability and debt management while the dependent variable is financial wellbeing of public servants. Research design, data, and methodology - Quantitative research is applied in this study, and data are collected by using cross sectional approach. Survey questionnaires are obtained from 270 respondents, which represents 79% response rate. The multiple regressions are used to examine the influence of attitude towards money, financial capability and debt management towards financial wellbeing. Results - The result of the multiple regression indicated positive influences of attitude towards money and financial capability on financial wellbeing. However, debt management found no significant influence on financial wellbeing. Conclusions - Research findings show that people have different attitudes towards money and different trends of expenditure. It is also crucial to be highlighted that employees' attitude and financial capability have a greater influence on overall satisfaction with employees' financial wellbeing. Some would want to show off their luxury items they bought to close friends or relatives and some are very prudent in making expenditures even for necessity items.

• 한국건축시공학회지
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• 제23권5호
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• pp.619-628
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• 2023

본 연구는 원도급 건설회사의 직접 시공 비중이 낮을수록 건축물의 하자를 유발하는 중요한 원인이 될 수 있다는 점에 대하여 2017년에서 2021년까지 기업 재무 데이터를 바탕으로 실증분석모형(ERM, Empirical Research Model)을 이용해 검증하였다. 그 결과 직접 시공 비중이 낮을수록 건설 품질을 저하시키는 주요 원인이 된다는 점을 확인하였고, 본 연구는 건설품질을 높이기 위해서 직접 시공 의무를 강화해야 한다는 주장을 이론적으로 뒷받침하는 실증분석이라는 점에서 그 의미을 가진다.

• 한국항만경제학회지
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• 제21권1호
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• pp.59-72
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• 2005

There were many theoretical studies using mathematical models about a yard storage capacity in a container terminal so far, but a simulation approach is newly popularizing. The reason why the simulation studies about yard storage capacity were a few was that once the most important part in a container terminal was a quay part. However, from the economic crisis year of 1977, the yard storage part in a container terminal became a critical resource because of the shortage of SOC investment resources. Therefore, after discharging or loading even through there was a waiting in the quay part or not, it can be swiftly improved the efficiency of a container terminal if it was handled rapidly or smoothly in a container yard. So the accurate assessment of yard storage capacity in a container terminal was needed. This study planed to assess the operation capability of a container yard via a simulation model. The model included many chatacteristics of three Korean container terminals such as Gamman Hanjin, Uam, and Hutchinson Busan at the period of 1999 to 2000. The 95% percentile was chosen as a criterion for judging of the storage capability by the recommendation of KPC (1998) and JWD (1998). A simulation approach with system dynamics concept considering the multi-directional impacts within the related variables can probavly foresee the future storage capacity of a terminal not just the past.

• Structural Monitoring and Maintenance
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• 제10권2호
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• pp.133-154
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• 2023

Obscured structural members are mostly under-evaluated during condition assessment due to lack of visual inspection capability. Insufficient information about the integrity of these structural members poses a significant risk for public safety. Time domain reflectometry (TDR) is a novel approach in structural health monitoring (SHM). Ordinary coaxial cables "as is" without a major modification are not suitable for SHM with TDR. The objective of this study is to propose a practical and cost-effective modification approach to commercially available coaxial cables in order to use them as a "cable sensor" for damage detection with the TDR equipment for obscured structural members. The experimental validation and assessment of the proposed modification approach was achieved by conducting 3-point bending tests of the model piles as a representative obscured structural member. It can be noted that the RG59/U-6 and RG6/U-4 cable sensors expose higher strain sensitivity in comparison with non-modified "as is" versions of the cables used. As a result, the cable sensors have the capability of sensing both the presence and the location of a structural damage with a maximum aberration of 3 cm. Furthermore, the crack development can be monitored by the RG59/U-6 cable sensor with a simple calibration.

• Journal of Electrical Engineering and Technology
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• 제5권3호
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• pp.389-399
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• 2010

Available transfer capability (ATC) is a measure of the transfer capability remaining in a transmission system. Application of unified power flow controllers (UPFCs) could have positive impacts on the ATC of some paths while it might have a negative impact on the ATC of other paths. This paper presents an approach to evaluate the impacts of UPFCs on the ATC from a cost/worth point of view. The UPFC application worth is considered as the maximum cost saving in enhancing the ATC of the paths due to the UPFC implementation. The cost saving is considered as the cost of optimal application of other system reinforcement alternatives (except for UPFC) to reach the same ATC level obtained by UPFC application. UPFC application costs include the maximum cost of alleviating the probable negative impact on the ATC of some paths caused by implementing UPFCs. Optimal system reinforcement is used for systems with UPFCs to determine the aforementioned cost. The proposed method is applied to the IEEERTS and the results are evaluated through a sensitivity analysis. The cost/worth of UPFC application is also used to develop an index for optimal UPFC location and the results are compared with those of other indices. A comparison is finally made with the results obtained using an existing ATC allocation profit-based approach to determine UPFC application worth.