• 디지털산업정보학회논문지
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• 제8권1호
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• pp.17-27
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• 2012

Most of the current cultivation log is recorded by growers manually or whose environment information is input based on the grower's own judgement. It is not easy for growers to record the image of disease and insect pests in the cultivation log. In this regards, u-Farm cultivation log management system based on Web 2.0 and smart phone is introduced in this paper, that is used for the effective cultivation management and grower's convenience. In the system, the value of environment information is transmitted to servers via sensors. It designs and implements Web 2.0 Flex so as to make the cultivation log more reliable and provide users with active, convenient GUI in case the log is recorded by desktop. In this process, detailed modules are designed by object-oriented UML considering the reusability and maintenance of the system. Moreover, the system introduced in this paper is proved to be more excellent by the qualitative assessment compared with the other researches.

• 한국건설관리학회논문집
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• 제16권4호
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• pp.118-128
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• 2015

BIM 기술은 현재 빠르게 건설 산업 전반에 적용 및 확산되고 있다. 그러나 고비용의 BIM 인프라, 법령의 부재, 운영 프로세스 등의 문제로 도입 초기의 기대와 달리 그 활용도면에서 만족할 만한 기대치를 채우지 못하고 있다. 설계 단계에서 수행되는 BIM 기술 기반의 협업 설계 인프라 구축은 성공적인 건설 프로젝트를 위한 필수 요소로 볼 수 있다. 현재 BIM은 클라우드 컴퓨팅기술과 결합하여 드로잉, 3D 모델링, 객체 데이터, 속성 정보 등을 생성할 수 있는 서비스 들이 파생되고 있으며 설계 인프라를 위한 핵심으로 떠오르고 있다. 본 논문은 VDI 시스템 환경 설정 및 구축을 통해 BIM 모델링, Viewing, 모델 체크, 마크업 등 BIM을 수행할 수 있는 서버 인프라 서비스 구축 방안을 제시한다. VDI 성능 시스템 테스트를 통하여 BIM 설계 환경에 필요한 가상 머신 리소스를 산정하고 배분하는 방식을 제안하여 클라우드 컴퓨팅 기반 BIM 설계 및 BIM 설계정보를 활용 프로젝트 운영 방향을 제시하고자 한다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 춘계학술대회논문집
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• pp.434-438
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• 2003

The shearing process for the sheet metal is normally used in the precision elements such as semi-conductor components. In these precision elements, the burr formation brings a bad effect on the system assembly and demands the additional de-burring process. In this paper, we have developed the desktop-type precision punching system to investigate the burr formation mechanism and present kinematically Punch-die auto aligning methodology, for the purpose of burr unifomizing and minimizing, between the rectangular shaped punch and die. By using the scanning electron microscope, the aligned punching results are compared with the miss-aligned ones. Also, we measured the relative burr heights using the self-designed laser measuring device for insitu self aligning. Since it is hard to get the perfect, so called, burr-free edges during the shearing process, we introduced the ultrasonic do-burring machine. The de-burring operation was carried out by a novel do-burring method, the reversal flow resistance method, under different machining loads and abrasive types. The final do-burring results show the validity of our punching do-burring system pursuing the burr-free punched elements.

• 컴퓨터교육학회논문지
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• 제9권6호
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• pp.65-78
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• 2006

유비쿼터스 사회(Ubiquitous Society)의 핵심기술인 RFID(Radio Frequency Identification)를 물류, 유통, 교통, 의료 등 다양한 분야에서 개발, 적용하는 연구가 활발하게 진행되고 있다. RFID를 이용하여 u-Campus, u-Library 등 유비쿼터스 교육환경을 마련해주는 연구들은 있으나 직접적으로 학습에 적용한 연구는 아직 미미한 실정이다. 따라서 본 연구에서는 RFID 태그와 리더의 무선통신 기술을 이용하여 학습자의 위치와 상황을 인지하고 그에 부합하는 영어 상황학습 서비스를 제공하고자 한다. RFID 시스템을 이용하기 위해 본 연구에서 제안하는 RFID 미들웨어는 기존의 범용 RFID 미들웨어와 달리 PDA 기반에서 동작하는 모바일 RFID 미들웨어로 필수 API를 중심으로 최적화하여 개발하였다.

• 제어로봇시스템학회논문지
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• 제13권7호
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• pp.694-702
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• 2007

The SSWM(Software Switching Mechanism) of I-processor concept using non-real time in-house software simulation program is an effective method in order to develop the flight control law in desktop or HQS environment. And, this system has some advantages compare to HSWM(Hardware Switching Mechanism) such as remove the time delay effectiveness and reduce the costs of development. But, if this system loading to the OFP(Operational Flight Program), the OFP guarantee the enough throughput in order to calculate the two control law at once. Therefore, the HSWM(Hardware Switching Mechanism) of 2-processor concept is necessary. This paper addresses the concept of HSWM of the HQS-PC interface using TCP/IP(Transmission Control Protocol/Internet Protocol) communication based on flight control law of advanced supersonic trainer. And, the fader logic of TFS(Transient Free Switch) and stand-by mode of reset '0' type are designed in order to reduce the abrupt transient response and minimize the integrator effect in pitch axis. The result of the analysis based on HQS pilot simulation using HSWM reveals that the flight control systems are switching between two computers without any problem.

• 한국정밀공학회지
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• 제29권11호
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• pp.1221-1227
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• 2012

As demands on micro-products increase significantly with raising functional integration and increasing complexity, microfoming attracts a lot of attention in the manufacture of micro-products. Since the conventional big forming systems are not adequate to achieve sufficient tolerances of micro-scale parts, it is necessary to reduce the scale of the forming equipment and devices. In addition, understandings on the size effects, which exist in the material behavior and process characterization of microforming processes, need to be expanded. In this study, a miniaturized forming system based on the ball screw and servo motor actuator was developed for the efficient micro-parts production. In addition, tensile tests and cylindrical upsetting experiments were performed to evaluate the performance of the microforming system and to investigate the flow stress and friction size effects in microforming processes.

• 한국컴퓨터정보학회논문지
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• 제12권2호
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• pp.243-249
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• 2007

현재의 홈 네트워크 시장이 커져가고 관련 제품이 늘어날수록 제품마다 각각 다른 인터페이스를 사용하고 있어 서로 간의 호환성이 결여되어 이를 쉽게 통합하여 관리할 수 있는 확장성이 있는 관리시스템 구축의 필요성이 대두 되고 있다. 본 논문에서는 홈센서 네트워크에서의 통합 관리를 위한 프레임 워크를 설계하고, 센서 네트워크 환경에서 JMX를 사용하여 Home Gateway를 구현함으로써 관리 할 대상에 대해 각 모듈별 관리와 통합된 외부 연결 인터페이스를 제공함으로써 기존 환경과의 호환성과 확장성을 고려하였고, 이를 통해 PDA 나 원격 PC를 통해 모니터링하고 관리하는 홈센서 네트워크 통합 관리 시스템을 구축하였다.

• Journal of Information Technology Applications and Management
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• 제17권2호
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• pp.71-90
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• 2010

Electronic learning(or e-learning) has created hype for companies, universities, and other educational institutions. It has led to the phenomenal growth in the use of web-based learning and experimentation with multimedia, video conferencing, and internet-based technologies. Many researchers are interested in the factors that affect to the performance of e-learning or e-learning services. In this sense, this study is aimed at proposing e-learning system reuse prediction models in which e-learner intention to reuse influence factors(i.e., system accessibility, system stability, information clarity, information validity, self-regulated efficacy, computer self-efficacy, perceived usefulness, perceived ease of use, flow, and parental expectation) affect e-learner intention to reuse positively. A web survey was conducted for the full members of the e-learning education institute A in Seoul, Republic of Korea, an exclusive e-learning company that provides real time video lectures via the desktop conferencing system. The web survey was conducted for 20 days from November 5, 2009, through the e-learning web site of the company A. In this study, three data mining techniques were used : the multivariate discriminant analysis, CART, and C5.0 algorithm. This study was conducted to provide the e-learning service providers, e-learning operators, and contents developers with marketing and management strategies for improving the e-learning service companies, based on the data mining analysis results.

• 조명전기설비학회논문지
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• 제23권12호
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• pp.1-9
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• 2009

최근 실내에 유입된 주광을 활용하여 인공조명의 에너지를 절감하는 광센서 조광제어시스템에 관한 연구는 유용한 주광의 유입을 위한 자동 차양장치와의 통합을 중심으로 이루어지고 있다. 기존의 연구는 자동 롤러쉐이딩시스템과 베니션블라이드에 관한 연구로, 이 두 시스템은 주광의 입사를 수직적으로 계산한 일영각을 기준으로 차양장치의 높이 및 각도를 계산하여 제어하고 있다. 본 연구는 광센서 조광제어시스템과 연동을 위한 새로운 차양장치로 주광의 유입을 수직 수평으로 제어하는 복층유리 격자루버시스템을 제안하고, 창면의 위치에 따른 루버의 간격을 산출하였으며, 컴퓨터 시뮬레이션을 통하여 격자루버시스템의 주광유입특성을 분석하고 평가하였다.

• 한국멀티미디어학회논문지
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• 제24권1호
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• pp.95-105
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• 2021

In the case of laptops and tablet PC's that replace desktop, it uses the Windows operating system to provide various functions depending on operating system dependency, the Windows operating system does not support real-time processing because it uses multi-level feedback queue scheduling that extends round-robin scheduling. Also, since the initial value of Local APIC Counter can not be obtained from the Windows 8, the real-time processing function provided through the existing RTiK does not work. In this paper, we calculate Local APIC Counter value by using MSR_FSB_FREQ register to support real-time processing function on tablet PC's. We designed and implemented RTiK+, which provides real-time processing function to guarantee the periodicity by calculating the operation time of accurate timer. In order to verify and evaluate the performance of the implemented the RTiK+, the period was measured by using the Read Time-Stamp Counter(RDTSC) instruction and it was confirmed that it operates normally at 1ms and 0.1ms period.