• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 춘계 종합학술대회 논문집
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• pp.151-155
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• 2005

Telemedicine은 의료진과 환자간의 정보교환을 제공하기 위한 일반적인 기술로 사용되어지고 있다. 더욱이 환자기록측면에서 의료진은 telemedicine applications을 통하여 생체신호와 다양한 환자데이터를 획득할 수 있다. 또한 최근의 RF기술의 발전과 무선통신기술은 Ubiquitous 네트워크의 발전을 가능하게 한다. 원격 모니터링 시스템은 휴대 인터넷기술을 이용하여 Mobile PDA를 이용하여 구현되어지는 대표적인 휴대인터넷기술의 적용분야이다. 본 연구는 임베디드 컴퓨터(SBC)를 기반으로 생체 정보를 모니터링하기 위한 무선 Telemedicine PDA Prototype을 구현하였다. 본 시스템은 휴대 인터넷기술을 이용하여 만성 질환 환자나 긴급한 상황에 매우 효과적으로 사용될 수 있으며, 노령화사회에 의료비용 유지에 효과적일 것이다.

• 한국멀티미디어학회논문지
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• 제18권12호
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• pp.1501-1508
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• 2015

In this paper, we describe a case study to improve performance through the load testing of multi-tired system for financial accounts before the system opening. The load test was conducted after the data collection tools(Performance Monitor, DB PSSDiag) were installed. By analyzing the collected log, we were able to identify the main sector requiring performance improvements among the presentation tier, web tier, business logic tier and data tier. The ASP.NET server-down on the web tier could be improved by modifying the parameter values in the configuration file. Some server downs occurred on the business logic tier when a large number of users access at the same time, were more difficult to be solved. By analyzing the hang-dump at the server-down time, we were able to find a process that caused the problem. and we had to modify the relevant codes. For major performance improvements of the data-tier, indices of some queries was optimized by using the built-in DBMS query analyzer, after analyzing the log of long-response-time queries. The problems and solutions considered in this case study will be a reference for the performance improvement of a multi-layer system with the similar structure.

• 한국정밀공학회지
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• 제16권6호
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• pp.90-99
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• 1999

A vehicle driving simulator is a virtual reality device which a human being feels as if the one drives a vehicle actually. The driving simulator is used effectively for studying interaction of a driver-vehicle and developing vehicle system of a new concept. The driving simulator consists of a vehicle motion bed system, motion controller, visual and audio system, vehicle dynamic analysis system, cockpit system, and etc. In it is paper, the main procedures to develop the driving simulator are classified by five parts. First, a motion bed system and a motion controller, which can track a reference trajectory, are developed. Secondly, a performance evaluation of the motion bed system for the driving simulator is carried out using LVDTs and accelerometers. Thirdly, a washout algorithm to realize a motion of an actual vehicle in the driving simulator is developed. The algorithm changes the motion space of a vehicle into the workspace of the driving simulator. Fourthly, a visual and audio system for feeling higher realization is developed. Finally, an integration system to communicate and monitor between sub systems is developed.

• 한국과학교육학회지
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• 제11권1호
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• pp.59-72
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• 1991

This study has formed a clear definition of the elements of inquiry skills : inference, determining relationship, causal explanation, prediction, and created the goals of assessment and the items of assessment. They have been checked the validity and the objectivity and the clarity of the items by six professors of science education. At the same time, the two times of the field trial has been executed. and checked the discriminating power and the difficulty index and the effectiveness of distracters, and modified the items. The test developed in this way was administered to 1060 students of the eighth grade, randomly cluster-sampled from the universe, and standardized. The test is the aptitude test as well as the norm-reference test. and has twenty items. The testing-time is thirty minutes. And the cotent validity is 85%, the objectivity of the answer keys 91.7%, the mean of items difficulty 68.8%, the mean of discriminating power 0.39, the standard deviation 3.31, the reliability(K-R 20) 0.69. Because it is the standardized lest, it can diagnose the well-developed skills and the ill-developed skills of the students, and monitor the development of skills.

• 한국물환경학회지
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• 제24권1호
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• pp.1-6
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• 2008

Biological and chemical sensors are the two most frequently used sensors to monitor the water resource. Chemical sensor is very accurate to pick up the types and to measure the concentration of the chemical substance. Drawback is that it works for just one type of chemical substance. Therefore a lot of expensive monitoring system needs to be installed to determine the safeness of the water, which costs too much expense. Biological sensor, on the contrary, can judge the degree of pollution of the water with just one monitoring system. However, it is not easy to figure out the type of contaminant with a biological sensor. In this study, an endeavor is made to identify the toxicant in the water using the shape of the chlorophyll fluorescence induction curve (FIC) from a biological monitoring system. Wem-tox values are calculated from the amount of flourescence of contaminated and reference water. Curve fitting is executed to find the representative curve of the raw data of Wem-tox values. Then the curves are digitalized at the same interval to train the neural network model. Taguchi method is used to optimize the neural network model parameters. The optimized model shows a good capacity to figure out the toxicant from FIC.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.495-498
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• 2010

본 시험장치는 가스터빈엔진의 이론적 열역학 계산을 실제 성능시험을 통해 비교해보고 관련 교육기관, 연구소 등에 가스터빈 엔진의 작동 원리와 구조에 대한 기초지식을 제공하도록 개발되었다. 추력 80lbf급 마이크로 터보제트 엔진을 대상으로 하여 NI DAQ(데이터 수집)장치와 LabVIEW 프로그램을 이용하여 실시간 계측되는 데이터와 기준 엔진 성능 시뮬레이션 데이터를 비교 할 수 있는 프로그램을 개발하였다.

• 한국컴퓨터정보학회논문지
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• 제22권1호
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• pp.41-48
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• 2017

In this study, we proposed GIS-based Regional Crime Prevention Index (RCPI) development method designed to support local governments with systematic crime prevention activities. The public interest in safe urban environment is increasing rapidly. The government is putting efforts into crime prevention activities to eliminate the criminal opportunities in advance. CPTED is method to prevent crimes in the city by improving environmental factors that cause crime. It is used by local governments to promote the crime prevention activities centering on the expansion of CCTVs and street lamps and the improvement of street environment. However, most policies were terminated as one-off programs and it is necessary to monitor the effect of such policies on a continuous basis. In order to alleviate issues, this study proposed RCPI as part of crime safety assessment in urban environments. The estimation of RCPI in City A of Gyeonggi-do showed relative differences in 31 districts (dong), indicating that it is also possible to evaluate the crime safety in the local community on the level of the administrative dong, the smallest administrative district in the urban environments. As a crime map, the RCPI will be used effectively as he reference to support the decision making process for local government in the future.

• 한국통신학회논문지
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• 제28권8A호
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• pp.657-662
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• 2003

광성능을 모니터하기 위해 필요한 것이 OPM(optical performance monitoring module)이다. OPM에서 가장 중요한 것은 광 신호의 파장을 측정하는 것이다. 기존에는 pilot tone을 사용하였으므로 파장값을 얻기가 어려웠지만, 그후 AWG(arrayed waveguide grating), AOTF (acousto optic tuneable filter) 등을 사용하여 다채널 신호에 대한 파장과 전송 품질을 모니터하게 되었다. 본 논문에서는 일반적으로 광 분해능이 우수하다고 평가되는 FFP-TF(fiber fabry perot tuneable filter)를 채택하였으며, FFP-TF를 사용하기 때문에 필요한 기준파장의 설정을 위하여 광섬유격자(FBG : fiber bragg grating)를 사용하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.455-458
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• 2006

The Real Time Kinematic (RTK) technique is the most productive and accurate GPS positioning method today, as it can be determinate position within few centimeters instantly. This method is widely used for applications such as surveying, structure monitoring and machine guidance etc. In order to perform RTK processing for large scale systems (i.e. precise vehicle monitoring with many rovers), many expensive RTK receivers and same number of bidirectional communication units have to be installed to collect observation data communicate with the reference site and monitor its RTK solutions. Moreover, if applications require remote control or apply sensing instruments, we have to install computers at each rover. To limit expense and complexity of system management with a large number of rovers, we have developed server based RTK processing platform to share RTK function for all rovers. The system can be process many GPS stations with a single personal computer. we have also developed a specialized dual frequency GPS receiver unit without on-board RTK processing capability to reduce receiver cost in order to demonstrate the advantage of our server based RTK platform. This paper describes the concept of our server based RTK platform and specialized GPS receiver unit with existing applications in Japan.

• 센서학회지
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• 제20권2호
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• pp.90-95
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• 2011

In order to protect human lives from disease, various biosensors having the potential to analyze a variety of biomolecules have been utilized. Biosensors constitute one of the most promising ways to monitor and detect various biomolecules corresponding to diseases. In this study, we demonstrate that the reaction of streptavidin molecules with biotin on a gold electrode can be detected using the twoelectrode method with a gold electrode and a platinum reference electrode. We also show the characteristics of the electrical current response. While detecting 2-${\mu}M$ streptavidin molecules dissolved in phosphate buffered saline(PBS) solution, we found that an analytical biosensor can operate on the principle of detecting an antigen-antibody reaction event of protein molecules using the two-electrode method. We think that the "potential step" method might be useful to detect the occurrence of any antigen-antibody reactions and can be combined with other devices or ICs such as BJTs, MOSFETs, and OP-amps for the detection of biomolecules of diseases.