• 반도체디스플레이기술학회지
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• 제18권4호
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• pp.116-119
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• 2019

User interface/experience and realistic game manipulation play an important role in virtual reality first-person-shooting game. This paper presents an intuitive hands-free interface of gaming interaction scheme for FPS based on user's gesture recognition and VR controller. We focus on conventional interface of VR FPS interaction, and design the player interaction wearing head mounted display with two motion controllers; leap motion to handle low-level physics interaction and VIVE tracker to control movement of the player joints in the VR world. The FPS prototype system shows that the design interface helps to enjoy playing immersive FPS and gives players a new gaming experience.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2023년도 제68차 하계학술대회논문집 31권2호
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• pp.225-226
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• 2023

취업 시장의 급변에 따라 교육 기관에서는 다양한 상황에 대응할 수 있는 시스템이 필요하다는 인식이 대두되고 있다. 특히, 취업 준비생들은 낯선 면접장에 빠르게 적응하여 면접에서 최상의 결과를 얻어내야 하는 요구사항이 있다. 본 논문에서는 요구사항을 충족시키기 위하여 메타버스 환경에서의 가상 인터뷰 시스템의 가상 면접장 프로토 타입을 소개한다. Unity를 기반으로 개발된 이 가상 면접장은 실제 면접과 유사한 환경을 제공하여 면접관 아바타를 통해 진행되는 면접의 현실감을 높일 수 있다.

• Educational Technology International
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• 제24권2호
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• pp.295-329
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• 2023

The recent development of metaverse-related technology has led to efforts to overcome the limitations of time and space in education by creating a virtual educational environment. To make use of this platform efficiently, applying learning analytics has been proposed as an optimal instructional and learning decision support approach to address these issues by identifying specific rules and patterns generated from learning data, and providing a systematic framework as a guideline to instructors. To achieve this, we employed an inductive, bottom-up approach for framework modeling. During the modeling process, based on the activity system model, we specifically derived the fundamental components of the learning analytics framework centered on learning activities and their contexts. We developed a prototype of the framework through deduplication, categorization, and proceduralization from the components, and refined the learning analytics framework into a 7-stage framework suitable for application in the metaverse through 3 steps of Delphi surveys. Lastly, through a framework model evaluation consisting of seven items, we validated the metaverse learning analytics framework, ensuring its validity.

• 디자인학연구
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• 제19권2호
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• pp.43-52
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• 2006

인터넷 쇼핑몰 시장의 급성장 속에서 의류 쇼핑몰이 선결해야 할 가장 중요한 과제는 바로 구매 후의 높은 반품률이다. 이러한 반품률은 감성적 구매를 요구하는 소비자들의 인터넷 의류 쇼핑몰에 대한 불만족과 불신으로 이어지고, 이로 인한 고객 만족의 하락으로 인터넷 의류 쇼핑몰의 미래를 어둡게 하는 가장 큰 장애요소로 부각되고 있는 상황이다. 즉 보고, 만져보고, 느껴보려는 소비자들의 감성적 구매요구를 충족시키지 못하고 있다는 것이다. 최근에는 사이버 피팅(cyber fitting)형 쇼핑몰이 등장해 이 같은 인터넷 쇼핑의 단점을 보완해 주고 있지만 시각적 흥미를 유발시키는 데는 성공했지만 기존 서술형 사이트에 비해 정보 제공성이라는 면에서 그리고 구매자의 필요한 감성적 욕구를 충족시키지 못하고 있다. 따라서 본 연구에서는 사용자 중심의 인터넷 홈쇼핑에 대한 해결 방안을 다음과 같이 모색하고자 한다. 첫째, 사용자들이 쉽게 접근할 수 있는 새로운 형태의 프로토타입(Prototype)의 개발이며, 둘째, 프로토타입(Prototype)에 따른 인터페이스를 통해 3D 가상현실로 내용적으로 그리고 감성적 욕구를 충족 시켜 소비자들이 정확한 판단을 이끌어낼 수 있도록 정보를 시각화하여 전달하고자 한다. 즉, 현재까지의 일방적이고, 정형화되어진 인터넷 전자 상거래 쇼핑몰을 소비자의 감성적 요구를 충족시킬 수 있는 사용자 중심의 3D 아바타를 이용한 인터넷 쇼핑몰 프로토타입(Prototype) 유형을 제시 하고자 한다.

• 패션비즈니스
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• 제13권6호
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• pp.20-30
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• 2009

The purpose of this study is to develop the effective customized elderly fashion marketing process based on the web site, where older customer will be able to choose various fabrics and to try them out. This aims to establish new prototype of internet shopping mall for customized elderly fashion clothing. In this study, new method of product presentation on the online shopping mall is proposed to offer product information through 3D virtual reality. With the online shopping mall(SATC Mall) as a showcase, we presented virtual mapping system so that it enable the customers to select the fabrics and to see exactly how chosen fabric will look when applied to image of clothing. As an initial test of the application of simulation to measure 3D visualization of product, mapping software Vision Easy Map Pro Version 6.0(NedGraphics) Vision Easy Map Viewer Version 5.0(NedGraphics) were chosen and applied. By using this mapping system, the fabric change of the apparel product could be made on the internet shopping web site. However, this approach has been successful applied for presenting and customizing garment products. Future research will focus on the integration of mapping coordination into SATC Mall.

• Journal of Computing Science and Engineering
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• 제5권4호
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• pp.331-337
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• 2011

Recently, Virtual Desktop Infrastructure (VDI) has been widely adopted to ensure secure protection of enterprise data and provide users with a centrally managed execution environment. However, user experiences may be restricted due to the limited functionalities of thin clients in VDI. If thick client devices like laptops are used, then data leakage may be possible due to malicious software installed in thick client mobile devices. In this paper, we present Data Firewall, a security framework to manage and protect security-sensitive data in thick client mobile devices. Data Firewall consists of three components: Virtual Machine (VM) image management, client VM integrity attestation, and key management for Protected Storage. There are two types of execution VMs managed by Data Firewall: Normal VM and Secure VM. In Normal VM, a user can execute any applications installed in the laptop in the same manner as before. A user can access security-sensitive data only in the Secure VM, for which the integrity should be checked prior to access being granted. All the security-sensitive data are stored in the space called Protected Storage for which the access keys are managed by Data Firewall. Key management and exchange between client and server are handled via Trusted Platform Module (TPM) in the framework. We have analyzed the security characteristics and built a prototype to show the performance overhead of the proposed framework.

• 대한기계학회논문집A
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• 제33권11호
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• pp.1326-1331
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• 2009

The sensor data measured by the legged robot are used to recognize the physical environment or information that controls the robot's posture. Therefore, a robot's ambulation can be advanced with the use of such sensing information. For the precise control of a robot, highly accurate sensor data are required, but most sensors are expensive and are exposed to excessive load operation in the field. The seriousness of these problems will be seen if the prototype's practicality and mass productivity, which are closely related to the unit cost of production and maintenance, will be considered. In this paper, the use of a virtual sensor technology was suggested to address the aforementioned problems, and various ways of applying the theory to a walking robot obtained through training with an actual sensor, and of various hardware information, were presented. Finally, the possibility of the replacement of the ground reaction force sensor of legged robot was verified.

• 한국CDE학회논문집
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• 제9권1호
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• pp.62-76
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• 2004

Many customers are no longer satisfied with mass-produced goods. They are demanding customization and rapid delivery of innovative products. Many companies are now realizing that the best way to reduce life cycle costs is to evolve a more effective product development paradigm using Internet and web based technologies. Yet there remains a gap between current market demands and product development paradigms. The existing CAD systems require that product developers possess all the design analysis tools in-house making it impractical to employ all the needed and newest tools. Hence, this paper addresses how assembly operation analysis can be embedded transparently and remotely into a service-oriented collaborative assembly design environment. A new assembly operation analysis framework is introduced and a relevant architecture and tools are developed to realize the framework. Instead of the current sequential process for verifying and validating an assembly design, a new Virtual Assembly Analysis (VAA) method is introduced in the paper to predict the various effects of joining during actual collaborative design. As a case study, arc welding and riveting processes are investigated. New service-oriented VAA architecture and its VAA components are proposed and implemented on prototype mechanical assemblies.

• Journal of Power Electronics
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• 제17권3호
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• pp.756-765
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• 2017

The control of the power conversion system (PCS) in a battery energy storage system has a challenge due to the existence of grid impedance. This paper studies an impedance model of an LCL-based PCS in the d-q domain. The feature of a PCS connected to a weak grid is unveiled by use of an impedance model and a generalized Nyquist criterion. It is shown that the interaction between grid impedance and the PCS destabilizes the cascaded system in certain cases. Therefore, this paper proposes a novel control method that adopts virtual resistors to overcome this issue. The improvement in the control loop leads the PCS to a more stable condition than the conventional method. Impedance measurement is implemented to verify the correctness of the theoretical analysis. Experimental results obtained from a down-scaled prototype indicate that the proposed control method can improve the performance of the PCS under a weak grid.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.265-265
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• 2003