• Korean Journal of Computational Design and Engineering
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• v.20 no.4
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• pp.337-347
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• 2015

This paper presents a dynamic association and natural interaction method for multi-displays composed of smart devices. Users can intuitively associate relations among smart devices by shake gestures, flexibly modify the layout of the display by tilt gestures, and naturally interact with the multi-display by multi-touch interactions. First of all, users shake their smart devices to create and bind a group for a multi-display with a matrix configuration in an ad-hoc and collaborative situation. After the creation of the group, if needed, their display layout can be flexibly changed by tilt gestures that move the tilted device to the nearest vacant cell in the matrix configuration. During the tilt gestures, the system automatically modifies the relation, view, and configuration of the multi-display. Finally, users can interact with the multi-display through multi-touch interactions just as they interact with a single large display. Furthermore, depending on the context or role, synchronous or asynchronous mode is available to them for providing a split view or another UI. We will show the effectiveness and advantages of the proposed approach by demonstrating implementation results and evaluating the method by the usability study.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.642-646
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• 2006

Jakarta-Slide는 Tomcat 웹서버의 WebDAV 프로토콜 지원 모듈로서 인터넷을 통하여 다양한 콘텐츠의 비동기적인 협업을 지원한다. CoSlide 협업시스템은 이러한 Jakarta-Slide를 사용하여 효과적으로 협업을 지원하는 시스템이다. CoSlide 협업시스템은 협업을 위한 가상공간을 제공하며 다양한 클라이언트를 통하여 가상공간에 자원을 등록하고 관리할 수 있다. CoSlide 협업시스템을 많은 사용자나 그룹이 사용하게 될 경우 가상공간과 자원에 대한 효과적인 관리가 필요하다. 하지만 현재의 CoSlide 협업시스템에서는 이러한 가상공간과 자원에 대한 전문적인 관리 기능을 지원하는 도구가 지원되고 있지 않기 때문에 관리 작업이 비효율적으로 이루어지고 있다. 본 논문에서는 CoSlide 협업시스템의 관리 도구 개발에 대하여 기술한다. CoSlide 관리 도구는 Tomcat Administrator Tool을 확장하여 구현되었으며, 효과적인 가상공간과 사용자 관리 기능을 제공한다. 시스템 관리자는 CoSlide 관리 도구를 통하여 협업에 참여하는 사용자를 추가하거나 삭제할 수 있으며 이러한 작업에 따라 개인 가상공간이 자동적으로 관리된다. 또한 그룹 가상공간의 정보를 제공하며 참여하고 있는 사용자들을 파악하고 등록된 가상공간에 대한 정보를 제공하여 효과적인 관리 기능을 제공한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.611-615
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• 2006

CoSlide서버는 협업지원 시스템 서버로서 WebDAV 기반의 Jakarta Slide 서버를 확장한 것이다. 협업지원 시스템은 원거리의 사용자들이 협업을 필요로 하는 업무를 수행하기 위해서 작업그룹을 형성하는데 필요한 시스템이다. WebDAV는 웹상에서 분산 저작을 지원하도록 HTTP를 확장한 IETF 표준 프로토콜이다. 현재 WebDAV 기반의 자원 관리가 널리 사용되면서 WebDAV 기반 응용프로그램들이 개발되고 있다. 본 논문에서는 CoSlide라는 WebDAV 기반의 협업시스템을 지원하는 리눅스 클라이언트의 개발에 대하여 기술한다. 개발된 리눅스 클라이언트는 편리한 GUI 기반의 사용자 인터페이스를 제공하며 그룹멤버들과의 상호작용을 원활하게 지원한다. 클라이언트 사용자는 협업시스템 서버에 등록한 자원의 관리와 새로운 그룹작업장을 생성하고 생성한 그룹작업장에 다른 사용자를 초대하거나 다른 그룹작업장에 참가요청을 할 수 있다. 그룹작업장의 생성자는 그룹작업장의 관리자로서 참가 요청한 사용자를 참가시키거나 불참시킬 수 있다.

• Journal of Engineering Education Research
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• v.7 no.2
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• pp.22-39
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• 2004

The study aims to explore whether the management and operation of national technique qualification system has a suitable role division between the government and non-government and to design plans for building it. To do so, a direction for role division between the government and non-government was investigated in the management, national technique qualification system. In addition, limitations in the operation of government-centered qualification system were pointed out by analyzing the present status on the management and operation of national technique qualification system and plans for role division between the government and non-government were proposed in the management and operation of qualification system. Various methods were applied to this study as its methodology: the collection and analysis of the relevant literatures, surveys targeting companies(internal qualification managers) and associations by industrial classification(owners' groups) as respondents, holding expert consultations for setting a direction in dividing roles between the government and non-government, interviews with companies and associations by industrial classification for gathering their opinions, forming and operating a collaborative research group consisting of specialists in qualification system.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.4
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• pp.1-7
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• 2009

In this paper, the author presents the MIMO(Multi-Input Multi-Output) receiver algorithm with the capability of inter-cell or inter-sector interference cancellation over multi-antenna OFDM(Orthogonal Frequency Division Multiplexing) systems. As contrast with the previous research dealing with the filtering scheme at the time domain, the proposed algorithm is presented as the pre-filtering scheme which can be applicable to the frequency domain. Note that the proposed one can be implemented only by pilot symbols which are used in the channel estimation. In addition, it is analytically confirmed that the proposed scheme can be applied for either MIMO( C-SM(Collaborative-Spatial Multiplexing)) interference or SIMO(Single-Input Multi-Out) interference. The proposed receiver algorithm is verified by simulations over UL-PUSC SR off in IEEE 802.16e standard. From simulation results, it is confirmed that the proposed one can be applicable regardless of the kind of interference. Furthermore, it is verified that the performance is guaranteed even under Ole severe effect of interference and the improvement of system throughput is guaranteed.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.4 s.310
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• pp.50-57
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• 2006

In Electronic Commerce, the latest most of the personalized recommender systems have applied to the collaborative filtering technique. This method calculates the weight of similarity among users who have a similar preference degree in order to predict and recommend the item which hits to propensity of users. In this case, we commonly use Pearson Correlation Coefficient. However, this method is feasible to calculate a correlation if only there are the items that two users evaluated a preference degree in common. Accordingly, the accuracy of prediction falls. The weight of similarity can affect not only the case which predicts the item which hits to propensity of users, but also the performance of the personalized recommender system. In this study, we verify the improvement of the prediction accuracy through an experiment after observing the rule of the weight of similarity applying Vector similarity, Entropy, Inverse user frequency, and Default voting of Information Retrieval field. The result shows that the method combining the weight of similarity using the Entropy with Default voting got the most efficient performance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.6
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• pp.259-268
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• 2018

The purpose of this study is to propose a training method customized to the level of cognitive abilities to increase users' interest and engagement while using cognitive function training contents. The level of cognitive ability of the users was based on the clustering based on the users' information and Mini-Mental Statue Examination-Korea Child test score using the K-means algorithm applied collaborative filtering. The results were applied to the integrated cognitive function training system, and the contents order and difficulty level of the cognitive function training area were recommended to the user's cognitive ability level. Particularly, the contents difficulty control was designed to give a high immersion feeling by applying the 'flow theory' method that users can repeatedly feel tension and comfort. In conclusion, the user-customized cognitive function training method proposed in this paper can be expected to be more effective and rehabilitative results than existing therapists' subjective setting of contents order and difficulty level.

• IE interfaces
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• v.23 no.2
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• pp.182-192
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• 2010

Customer needs for final products are very unpredictable because product specifications and technologies are being improved very quickly thereby their requirement level is also elevated correspondingly. In order to survive and to enhance competitiveness in the global market, many manufacturing companies are trying to find a breakthrough from collaborization. Even though they want to collaborate with others, however, they do not exactly know what kind of system they have to develop or which technology they have to use. In this paper, therefore, we first investigate status and trend of information systems and infrastructure that are essential for collaboration. We then clearly describe definition and classification of collaboration with various point of views considering collaboration pattern, timing condition of collaborative activities, organizational structure, etc. With web-based collaboration systems already developed by i-Manufacturing (Korean-style Manufacturing Innovation) project, led by Korean government from 2004, we introduce main functions and analyze collaboration types of each system. Strategically important technologies for supporting collaboration will also be illustrated by reorganizing collaborization technologies after evaluating them with respect to emergency and importance of each technology. We hope this research will provide a guideline on collaboration especially for small and medium sized manufacturing companies.

• The Transactions of the Korea Information Processing Society
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• v.7 no.5
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• pp.1330-1340
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• 2000

Multimedia isn ow applied to various real world areas. In particular, the focus on multimedia system and CSCW(Computer Supported Cooperative Work) has increased. In spite of this current trend, however, the study of fault tolerance for CSCW has not yet fully progressed. We propose EDR_MSCW. It is a system that is suitable for detecting ad recovering software error based on multimedia computer supported cooperative work as DOORAE by using software techniques. DOORAE is a framwork for supporting development on multimedia applications for computer-based collaborative works. When an error occurs, EDR_MCSCW detects an error by using hooking methods in MS-Windows API(Application Program Interface) function. If an error is found, we present a checkpointing and recovery algorithm which has the removal function of the domino-effect for recovering multimedia and CSCW by using stack.

• Journal of Korea Game Society
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• v.20 no.3
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• pp.85-94
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• 2020

AI-based smart factory technologies are only increase short-term productivity. To solve this problem, collaborative intelligence combines human teamwork, creativity, AI speed, and accuracy to actively compensate for each other's shortcomings. However, current automation equipmens require high safety measures due to the high disaster intensity in the event of an accident. In this paper, we design and implement a factory safety control system that uses a depth camera to implement workers and facilities in the virtual world and to determine the safety of workers through simulation.