• 디지털콘텐츠학회 논문지
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• 제18권4호
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• pp.631-639
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• 2017

기술공학 분야 직업훈련에서 체험, 실습 중심의 학습을 위한 가상훈련 콘텐츠 개발과 활용이 증가하고 있다. 가상훈련은 실제 장비, 작업 환경과 유사한 학습 환경에서 반복적으로 안전하게 교육이 가능하고, 이는 학습자들이 실제 작업 현장에서 장비를 구동하는 데에 도움이 된다는 장점을 가진다. 본 연구에서는 가상현실 기술을 활용하여 이론 학습과 다양한 상황에서의 실습이 가능한 "토탈스테이션과 GNSS를 이용한 측량" 콘텐츠를 개발하고, 이에 대한 사용자 경험을 탐색하고자 하였다. 사용자들은 본 콘텐츠에 높은 흥미와 몰입감, 인지된 학습 효과성, 만족도를 보였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.462-467
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• 2005

This paper presents virtual machining system in order to realize turning process in virtual space. A reliable virtual turning process simulation was developed based on the surface shaping system which is capable of considering geometric model, thermal error model, and vibration model. Accuracy of surface shape resulting from proposed machining simulator was verified experimentally. This paper also developed the watchdog agent that continuously assessed, diagnosed, and predicted performance of products and machines in machining. The Watchdog agent extracted feature signal using time-frequency analysis among various signals from multi-sensor and evaluated machining condition using performance confidence value.

• 한국의상디자인학회지
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• 제25권3호
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• pp.41-52
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• 2023

This study developed and taught VR content to be used in clothing design and composition practice, which are practical subjects for home education students at the College of Education, and examined the learning effects on students who participated in VR experiences. First, after experiencing classes using VR content, students' perceptions of classes were examined considering participation, class level, expectations, and satisfaction through a survey. As a result of examining the experience of learning sewing machines in classes using VR content and changes in perception of classes, it was found that the class level, class expectations, and satisfaction were affected. As a result of comparative analysis of VR experiences and the perception of VR classes prior to experiencing VR content related to sewing machines developed for practical subjects, VR experiences affected class participation, class level, expectations, but satisfaction was not affected. The advantages of the VR class that students mentioned in the subjective evaluation included interest in the class, the degree of participation, the VR experience, and the use of VR. As for the disadvantages, difficulties in using the device, dizziness, frustration when using the device, and limitations of the program were mentioned.

• 대한임베디드공학회논문지
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• 제12권6호
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• pp.385-393
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• 2017

As the use of mobile devices such as smartphones increases, there is growing interest on the benefits of virtualization in embedded systems. Full virtualization has the advantage of running the guest virtual machine without modifying the guest operating system. However, full virtualization suffers slow execution speed due to the cost of context switching between the virtual machines and the virtual machine monitor. In this paper, we propose a translated block and context switching optimization to improve the guest execution speed in the embedded system. As a result, the improved dynamic binary translator is up to 5.95 times faster than the native execution. Performance degradation is less than that of the other virtualization system.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(B)
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• pp.17-20
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• 2011

This paper presents an approach for integrating u-Life care applications into the Cloud computing based on virtual resources to support real-time services and to improve quality of service (QoS) requirement. We propose an architecture for virtualization resources scheduling. The proposed is based on the concepts of Cloud computing and Wireless sensor networks. In this paper, we focus on the scheduling u-Life care applications run on the virtual machine (VM) resources in Cloud computing.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.149-154
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• 2003

The blister packaging is applied to many fields in recent years for its merit that it enable consumer to see the products. The most of battery packaging are blister type. However, the lithium battery is dealt with very carefully in packaging because of its explosion. The existing packaging machines for lithium battery are mostly adapted alkaline packaging machine and their capacity is very inferior to other process, either. In this paper, the virtual prototype of the automatic blister packaging system for lithium battery which has new mechanism and 240A/min capacity is developed and its performance is evaluated.

• 드라이브 ㆍ 컨트롤
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• 제12권2호
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• pp.14-20
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• 2015

This paper focuses on the issue of force synchronizing control for the injection servomechanism of injection molding machines. Prior to the controller design, a virtual design model was developed for the injection mechanism with an AC servomotor-ball screw. A synchronizing controller is designed and combined with the PID control to accommodate the mismatches between the real plant and the linear model plant used. Due to the plant uncertainty, the stiffness and the damping of the mechanism were considered. From the tracking control simulations based on the virtual design model, it is shown that a significant reduction in force synchronizing error is achieved through the use of a proposed control scheme.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권9호
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• pp.4320-4333
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• 2017

Energy-efficient virtual resource allocation algorithm has become a hot research topic in cloud computing. However, most of the existing allocation schemes cannot ensure each type of resource be fully utilized. To solve the problem, this paper proposes a virtual machine (VM) allocation algorithm on the basis of multi-dimensional resource, considering the diversity of user's requests. First, we analyze the usage of each dimension resource of physical machines (PMs) and build a D-dimensional resource state model. Second, we introduce an energy-resource state metric (PAR) and then propose an energy-aware multi-dimensional resource allocation algorithm called MRBEA to allocate resources according to the resource state and energy consumption of PMs. Third, we validate the effectiveness of the proposed algorithm by real-world datasets. Experimental results show that MRBEA has a better performance in terms of energy consumption, SLA violations and the number of VM migrations.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1648-1649
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• 2007

This paper proposes a very novel method which makes it possible that state feedback controller can be designed for unknown dynamic system with measurable states. The RLS algorithm is used for the identification of input-output relationship. A virtual state space representation is derived from the relationship and the SVM(Support Vector Machines) makes the relationship between actual states and virtual states. A state feedback controller can be designed based on the virtual system and the SVM makes the controller be with actual states. The results of this paper can give many opportunities that the state feedback control can be applied for unknown dynamic systems

• 정보과학회 컴퓨팅의 실제 논문지
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• 제22권3호
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• pp.139-144
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• 2016

최근 악성코드를 이용한 위협은 사이버 상에서 가장 위협적이고 점차 지능화되고 있다. 하지만 안티 바이러스 제품이나 기존의 탐지 솔루션은 복잡해지고 정교해지는 악성코드에 대해 효과적으로 대응하지 못한다. 본 논문에서는 분석 환경 회피 기술을 갖는 악성코드를 보다 효과적으로 식별하기 위해 실제 컴퓨터 환경을 기반으로 악성코드의 동작 및 상태를 감지하고 악성코드의 요구사항을 동적으로 핸들링하는 환경을 제안한다. 제안하는 방법은 리얼머신 기반의 바이너리 자동실행 환경과 가상머신 환경에서의 악성코드 악성행위 활동성을 비교하여 지능형 악성코드를 효과적으로 분석하기 위한 동적 분석환경을 제공할 수 있음을 실험하여 보였다.