• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제50차 하계학술대회논문집 22권2호
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• pp.99-100
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• 2014

Even though many projects of new development and redevelopment for information systems are invested, they are not taken care of from the perspective of administration and evaluation. Also, decision makers fall short of not only support the process to check alternatives and select an alternative for investment and but also provide necessary information so as to maximize the effects of investments. That is to say, the suggestion of general direction toward IT investment is debatable. Against this backdrop, we propose a value measurement model to manage information systems.

• Journal of electromagnetic engineering and science
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• 제6권1호
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• pp.76-81
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• 2006

Ultra wideband(UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geo-location, and other applications. The energy of UWB signal is extremely spread from near DC to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional wireless systems sharing the frequency bands such as Broadcasting system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a orthogonal frequency division Multiplex UWB source and an impulse radio UWB source, to a Broadcasting transmission system. The receive power degradations of broadcasting system are presented. From these experimental results, we show that in all practical cases UWB system can coexist 35 m distance in-band broadcasting network.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2023년도 제68차 하계학술대회논문집 31권2호
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• pp.333-334
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• 2023

본 논문에서는 모기 활동 수치를 측정하기 위한 효율적인 머신러닝 모델을 제안한다. 수집된 데이터의 분석을 통해 효율적인 모델을 선정한다. 또한 데이터셋의 상관관계를 분석하고 데이터 가중치에 따라 모기의 활동에 영향을 주는 환경이 무엇인지를 분석한다. 본 논문에서는 모델을 이용한 앱 개발하여 실질적으로 모델을 활용한 예시를 보이고 실생활에서의 해당 모델을 도입하였을 때 가져올 일상의 긍정적 효과를 보인다.

• Journal of Electrical Engineering and Technology
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• 제6권6호
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• pp.776-785
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• 2011

Since the Internet-based real-time Global Positioning System(GPS) synchronized widearea power system frequency monitoring network (FNET) was proposed in 2001, it has been monitoring the power system frequency in interconnected United States power systems and numerous interesting behaviors have been observed, including frequency excursion propagation. We address the consistency of a frequency excursion detection order of frequency disturbance recorders in FNET in relation to the same generation trip, as well as the ability to recreate by power systems dynamic simulation. We also propose a new method, as an application of FNET measurement, to locate a tripped generator using power systems dynamic simulation and wide-area frequency measurement. The simulation database of all the possible trips of generators in the interconnected power systems is created using the off-line power systems dynamic simulation. When FNET detects a sudden drop in the monitoring frequency, which is most likely due to a generation trip in power systems, the proposed algorithm locates a tripped generator by finding the best matching case of the measured frequency excursion in the simulation database in terms of the frequency drop detection order and the time of monitoring points.

• 시스템엔지니어링학술지
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• 제12권2호
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• pp.81-90
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• 2016

The system performance of Engineered Safety Features is of utmost importance in a nuclear power plant. The human performance is identified as most critical to assurance of the optimal operability of safety systems during an emergency. The aim of this study is to determine how the performance of safety system could be evaluated using Augmented Reality technology. The paper presents a description of how a systems engineered approach could be used to develop the necessary operating conditions needed to conduct this measurement. Augmented Virtual Reality (AVR) interface technology is achieving ease of availability and widespread use in many applications today as illustrated by the launch of several AR and VR devices aimed at media consumption. As such, environments that incorporate such AVR hardware have become invaluable tools in designing human interface systems because of the high fidelity and intuitive response to natural human interaction that can be achieved [2]. The outcome of the measurement undertaken is to determine whether 1.) Operator(s) performance can be enhanced by introducing an improved cognitive method of monitoring plant information during an Emergency Operating Procedures (EOP) and 2.) In correlation, inform the performance of the diverse safety systems on the basis of human factors.

• 한국사회복지학
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• 제45권
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• pp.126-155
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• 2001

It has been 5 years since evaluation systems were introduced to the social welfare field in Korea. More than half of social welfare agencies (617 out of 1,267) were evaluated in the past two years. Most areas of the agencies were the target of an extensive evaluation in 2000. As "the Evaluation Era" has come, problems were raised especially regarding the Accreditation system of the Ministry of Health and Social Welfare. More specifically, the problems were related to operation and management of the evaluation systems including the issue of evaluators' objectivity and fairness. In addition, evaluation costs have been too high to the government. The evaluation systems of OECD nations including the United States were quite different. These nations have used the Performance Measurement in order to secure the objectivity and the fairness. Although the quantity of information was limited compared to that of the Accreditation system, these nations have taken the lead in the governmental evaluation. In this context, this study compared social welfare evaluation systems between Korea and the United States. It presented the current status and problems of the Accreditation system of the Ministry of Health and Social Welfare, discussed the American Performance Measurement and its limitations, and compared the strengths and weaknesses of the two evaluation systems. In addition, this study suggested the strategies of Korean evaluation systems in the long term as well as in the short term.

• 한국지능시스템학회논문지
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• 제24권4호
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• pp.424-429
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• 2014

본 논문에서는 발광광고물의 휘도를 측정하는 영상기반 휘도측정시스템을 제안한다. 제안하는 휘도측정시스템은 DSLR 카메라의 영상을 이용하여 점휘도계의 효율성과 면휘도계의 휴대성 및 경제성의 단점을 보완하며, 대상의 전체적인 휘도를 측정하는 시스템으로 영상을 입력받아 휘도분석 알고리즘을 통해 실시간으로 휘도값이 출력되도록 설계하였다. 측정 대상인 발광광고물은 설치 위치, 크기, 모양이 다양하며, 발광광고물의 휘도는 측정 거리, 각도, 색 등 다양한 조건에 따라 측정값이 달라진다. 따라서 정확한 휘도를 측정하기 위하여 측정대상물과의 거리에 따른 휘도값의 변화를 측정하였고, 측정 거리가 증가하면 휘도값이 변화하는 것을 고찰하였다. 실험을 통하여 측정 위치와 휘도값의 연관성을 수식으로 나타내었고, 제안한 방법을 평가하기 위해 점휘도계를 이용한 측정값과 비교 실험을 진행하였다.

• 한국지능시스템학회논문지
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• 제23권6호
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• pp.505-510
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• 2013

본 논문에서는 현재 운영 중인 DGPS 기준국 환경에서 위성시계 이상 발생시 실시간으로 이상현상을 검출하고 식별하기 위하여, 기준국 수신기의 측정잡음을 최소화하는 기법에 대해 다룬다. 기준국 수신기의 측정잡음을 최소화하기 위하여, 의사거리 측정치에 포함된 오차항목을 제거하여 순수 측정잡음 만을 추정한다. 먼저 두 대의 기준국 수신기의 출력을 이용하여 비공통 성분 오차를 제거한 다음, 해당 보정치를 적용하여 측정잡음을 최소화시킨다. 측정잡음 최소화를 기반으로 위성시계 이상발생시 이상신호를 검출하고 이상위성을 식별하여 DGPS 기준국 시스템의 가용성을 증대시키고자 한다.

• 제어로봇시스템학회지
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• 제4권3호
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• pp.7-9
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• 1998

• 산업경영시스템학회지
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• 제41권4호
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• pp.248-255
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• 2018

Ensuring the quality of molds is one of the major issues in mass production. In general, securing the quality of the molds is achieved by repeating grinding and die spotting after machining the molds based on engineer's decision. However, this heuristic method is affected by the engineer's skill and working environment. Therefore, a lot of time and resources are needed in order to ensure quality. In this study, ensuring the quality of molds using grinding map which is generated using automatic measurement is proposed. An automatic measuring system based on CMM (Coordinate Measuring Machine) is developed for measuring the molds. This system generates the measurement path automatically using the 3D CAD model of products. CAD (ComputerAided-Design), CAM (Computer-Aided-Manufacturing), and CAQ (Computer-Aided-Quality) technology is integrated using DMIS (Dimensional Measuring Interface Standard) format in the automatic measuring system. After measuring the molds, a grinding map is generated using the gap between the CAD model and measured values of mold. The grinding map displays the machining tendency and the required amount of grinding with values on a 3D map. Therefore, the quality of molds can be ensured with exactness and quickness based on the grinding map. This study shows that integrating the planning, measuring, and analyzing based on computer technology can solve the problem of quality assurance of mold using the proposed method, therefore the productivity can be increased.