• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2001년도 봄 학술발표회 논문집
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• pp.465-474
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• 2001

Base Isolation system is an effective design strategy that provides a practical substitute for the seismic design of bridge. In this study, the dynamic tests was performed on HDB (Hysteretic Damping Bearing) and Dynapot. Then, the dynamic analysis was carried out for a bridge using the experimental results to estimate the seismic performance of bearings. Analysis for bridge was performed for four types of earthquake loadings. The result of dynamic test and theoretical analysis indicate that the performance of HDB and Dynapot is appropriate for the earthquake loading.

• 한국전기전자재료학회논문지
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• 제36권4호
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• pp.351-361
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• 2023

본 논문은 대학연구실과 산업현장에서 태양전지를 연구 개발하는 초년생들이 태양전지 성능 분석하는 데 있어 가장 기본적이면서도 중요한 양자효율(quantum efficiency) 측정, 분석 방법에 이해를 돕는 것을 목적으로 한다. 양자효율의 정의를 시작으로, 측정 방법, 분석 방법에 대한 자세한 소개와 함께 태양광 스펙트럼으로부터 태양전지 소재의 밴드 갭에 따른 이론적인 전류밀도를 계산하고, 이론적인 전류밀도와 양자효율 측정, 분석을 통해 태양전지의 성능을 분석하는 방법에 대해 깊이 있게 논의한다. 태양전지의 양자효율 측정 분석은 태양전지를 깊이(전면, bulk, 후면)에 따라 분석할 수 있어 태양전지 성능 분석에 직관을 줄 수 있는 매우 유용한 방법이다. 이론적 전류밀도와 양자효율 측정 분석에 대한 깊은 이해로 태양전지를 연구하는 학생과 연구원들이 태양전지의 성능 분석을 하는 데 있어 기반으로 활용할 수 있기를 기대한다.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2006년도 춘계학술대회
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• pp.87-109
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• 2006

The purpose of this paper is to examine the present performance evaluation methods and to make Monte Carlo Simulation Model for the IT-based Government innovation project. It is suggested the proper ways in applying of Monte Carlo Simulation Model by integration of present evaluation methods. It develops the theoretical framework for this paper, examining the existing literature on proposing an approach to the key concepts of the economic impact analysis methods. It examines the actual conditions of performance evaluation focusing on the It-based Government Innovation project. It considers how the simulation model is applied to the performance management in the public innovation project focusing on the framework, process and procedure of performance management.

• 품질경영학회지
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• 제46권1호
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• pp.113-134
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• 2018

Purpose: The purpose of this study was to clarify the causal relationship and correlation between audit quality and audit performance and to analyze theoretical discussions and actual facts in order to improve audit performance on public enterprise audit and to identify what factors contribute to management and to seek ways to secure business performance. Methods: In this study, theoretical consideration was conducted that concerned the definition of audit, the concept of internal audit, the audit quality and the audit performance after having considered advanced researches, related regulations, and literatures. Through the foundation of such theoretical consideration, the components of the audit quality were deducted and each component's impact on the audit performance was empirically proven. The collected data through the survey were analyzed using multi-regression analysis. The measurement tools used for this study were divided into three dimensions such as internal quality, interaction quality and environmental quality. Result: First remark, out of the various components of the audit quality, independence, professionalism, and empathy appear to positively impact the audit degree of satisfaction. However, the measure of sufficiency is shown to bear no correlation to the audit degree of satisfaction. Second, out of the various components of the audit quality, professionalism, sufficiency, and empathy appear to positively impact the audit degree of applicability. However, the measure of independence is shown to bear no correlation to the audit degree of applicability. Third, audit quality appears to positively impact the audit degree of satisfaction and applicability, and also the performance of management. Concusion: It appears that the audit quality positively impacts the audit degree of satisfaction, applicability and management performance indicated by the audit performance.

• 소음진동
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• 제8권2호
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• pp.283-288
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• 1998

If one wants to control the noise from a duct, then one must have sufficient number of sensors and actuators so that the control system is observable and controllable. A number of sensors and actuators for control of radiating noise from a duct have to be incorporated with the number of modes which one wants to control. These considerations motivated the present study that considers a control system which has less microphones and actuators than required. In this work, by theoretical analysis and numerical simulation, the control performance and robust reliability of such a kind of control system is investigated in terms of sound-field variables and control system variables. Then the possibility of implementation of the robust radiation power control system is verified by theoretical analysis and numerical simulation. In addition, the control performance of the control system is verified by experiment.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.724-730
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• 2000

Although there have been many investigations employing the continuous wavelet transform for the analysis of dispersive waves, they seem to lack theoretical justifications for the effectiveness of the continuous wavelet transform over other time-frequency analysis tools such as the short-time Fourier transform. The goal of this paper is to answer this question by investigating theoretically the performance of the continuous wavelet transform and the short-time Fourier transform in tracing rapidly time-varying flexural waves. As a specific example, the performance of the two transforms is compared in a problem dealing with flexural waves generated by an impact in a solid circular cylinder.

• 디지털산업정보학회논문지
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• 제20권1호
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• pp.119-131
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• 2024

The purpose of this study is to examine the operational performances by the investment level of information security in companies. The theoretical background summarized the meaning of information security, management information security, and network security. The research process was carried out in four stages. As a result of the analysis, the level of information security was classified into four groups, and the difference in operational performance was confirmed. According to the categorical regression analysis of the three dependent variables, independent variables such as network threats, non-network threats, executive information security awareness, industry, organizational size, and information security education all affected information security regulations, in-house information security checks, and information security budget investments. The theoretical implications of this study have contributed to updating the latest information security theory. Practical implications are that rational investments should be made on the level of information security of companies.

• Journal of Information Technology Applications and Management
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• 제29권6호
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• pp.63-80
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• 2022

In this paper, we study structural changes and performance gains in condition-based maintenance process redesign when mobile IoT technology is embedded into urban railway rolling stock. We first develop condition-based maintenance To-Be process model in accordance with the IoT deployment scheme. Secondly, we draw upon theoretical framework of redesign process analysis to develop performance evaluation method suitable to predictive maintenance shift from As-Is ordinary maintenance practice. Subsequently, To-Be process performance evaluations are conducted adopting both the quantitative and qualitative method for time, cost, and dependability dimensions. The results ascertain the considerable benefits captured through detection abnormality prior to actual rolling stock failure occurrence, and details of performance improvements and enhancement of standardization level is revealed. The procedures and results presented in this paper offers useful insights in the fields of IoT economic analysis, condition based maintenance, and business process redesign.

• ETRI Journal
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• 제44권1호
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• pp.117-124
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• 2022

In this paper, the performance of precoding-aided differential spatial modulation (PDSM) systems with optimal transmit antenna subset (TAS) selection is examined analytically. The average bit error rate (ABER) performance of the optimal TAS selection-based PDSM systems using a zero-forcing (ZF) precoder is evaluated using theoretical upper bound and Monte Carlo simulations. Simulation results validate the analysis and demonstrate a performance penalty < 2.6 dB compared with precoding-aided spatial modulation (PSM) with optimal TAS selection. The performance analysis reveals a transmit diversity gain of (N_T-N_R+1) for the ZF-based PDSM (ZF-PDSM) systems that employ TAS selection with N_T transmit antennas, N_S selected transmit antennas, and N_R receive antennas. It is also shown that reducing the number of activated transmit antennas via optimal TAS selection in the ZF-PDSM systems degrades ABER performance. In addition, the impacts of channel estimation errors on the performance of the ZF-PDSM system with TAS selection are evaluated, and the performance of this system is compared with that of ZF-based PSM with TAS selection.

• 한국추진공학회지
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• 제21권2호
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• pp.72-82
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• 2017

무노즐 부스터는 통합형 로켓 램제트 추진기관에 적용되는 구성품 중 하나이다. 무노즐 고체 부스터의 성능을 예측하기 위해서 간단한 이론적 해석이 L/D=5, 6, 7, 9, 11, 그리고 13에 적용되었다. 연소가스 유동 효과 때문에 경도를 증가시키기 위해서 금속함량이 높은 Al-HTPB 및 Zr-HTPB 추진제가 사용되었다. 간단한 이론 해석과 시험결과 사이의 경향은 유사하게 나타났다.