• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.227-229
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• 2000

공간적으로 분산되어 있는 여러 작업자들이 웹 상에서 실시간으로 협력 연구할 수 있도록 하기 위해서는 기본적으로 협동작업 지원 도구인 화상회의, 전자칠판의 지원뿐만 아니라 동기적 웹 브라우저의 공유 또한 필수적이다. 본 논문에서 소개하는 동기적 웹 브라우저의 공유 시스템에서는 협동 작업자들이 주소 동기화(URL Synchronization) 및 폼 동기화(Form Synchronization)를 통해서 워드 및 파워포인트와 같은 웹 문서와 웹 데이터베이스의 내용을 공유할 수 있고 브라우저의 내용이 길어질 경우에도 스크롤 동기화(Scroll Synchronization) 및 윈도우 크기 동기화(Window Size Synchronization)를 통해 문서내의 같은 부분을 공유할 수 있다. 본 논문에서는 공간적으로 분산되어 있는 여러 작업자들이 협동작업을 위해서 상용 웹 브라우저를 이용하여 웹 문서와 웹 데이터베이스를 공유함으로써 보다 효율적인 작업을 할 수 있는 시스템을 소개한다.

• Journal of Korea Multimedia Society
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• v.8 no.3
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• pp.389-397
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• 2005

In this paper, we study the synchronization method of animated simulations and VRs for on-line virtual reality education system. To build the data of animated simulations and synchronization modules of VRML content, the media-synchronizing technology, HTML + TIME and scripts are used. The VRML control module ismade into Java applet using the Java EAI provided for the web and the interface for VRML contents. To control the animation of VRML contents, the node information is extracted, and an animation production template capable of controlling animation in inter-connection with VRML content is made. With evaluation of the animation control performance, processing speed, synchronization performance between media in the system built, more improved results are obtained. We would like to suggest a education system with easy system construction and various multi-medium applicability by realizing HTML + TIME media synchronization and VRML web 3D virtual reality creation techniques, and animated images and 3D animation controls according to time using Java through this study.

• The KIPS Transactions:PartB
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• v.11B no.1
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• pp.45-52
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• 2004

We propose ESS_WMCE. This paper explains the design and implementation of the EDSS running on ESS_WMCE. EDSS is a synchronization error control system for web based multimedia collaboration environment. We have an error detection approach by using hooking method. The technique of an error transmission is a mended model of utilizing an application sharing system. DOORAE is a good framework model for supporting development on application for computer supported cooperated works. It has primitive service functions. Service functions are implemented with an object oriented concept. It is a system that is suitable for detecting and sharing a software error rapidly occurring on web based multimedia collaboration environment by using software techniques. It is able to share an error as well as providing URL synchronization to access shared objects. When an error occurs, this system detects an error by using hooking methods in MS-Windows API(Application Program Interface) function. If an error is found, it is able to provide an error sharing to access shared objects.

• The KIPS Transactions:PartA
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• v.8A no.1
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• pp.70-74
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• 2001

A general web-based remote lecture system uses video data and audio data to provide synchronize between teacher and students. This system requires high bandwidth, high speed networking, television, compression and computing technologies between server and client for remote lecture over Internet. As a result, this system can decrease an efficiency for lecturing over current Internet. So, this paper proposes a new mechanism calling as ‘Synchronization of WWW browsers between server and client’to cope with above problems and finally pursues low cost needed for real-time remote lecture over Internet. The mechanism means that every browser of teacher and students displays the same page and the action of teacher is transferred to the browser of student. And, this can be implemented by Windows hooking APIs, Memory Mapping, and DLL (Dynamic Link Library) programming technology. This paper points to the design and implementation of LAS (Lecture Assistant Server) and LAC (Lecture Assistant Client) to perform the synchronization between server and client.

• Journal of Korea Multimedia Society
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• v.3 no.6
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• pp.611-616
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• 2000

By the most important media to deliver the contents on a remote instruction we commonly use audio and documents. A number of remote instruction system are trying to offer the video, but they did not acquire satisfiable results because of the limited network and width. Also, they use the general web browsers that have a lot of unspecific users access the contents. Also, they use the general web browsers that have a lot of unspecific users access the contents. Like this most systems that use the continuous media have not offer the satisfiable contents because of the network limitation. Moreover, because they use the web browser, they offer the contents having documents(web pages) only. In this paper, we propose a web-based remote instruction system on real-time using audio and documents which are the most important media for a information delivery. In addition to the system, we use a action synchronization mechanism between the web browsers. If the instructor uses web pages on his computer and explains the contents of them, the learners see the same web pages as the instructor's and listens to his voice.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.3
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• pp.239-244
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• 2014

As the usefulness of mobile device is kept growing the privacy of the cloud computing is receiving more attentions. Even though many researches and solutions for privacy matters are suggested we are still worrying about the security problems. In addition most of cloud computing systems uses file-level synchronization which make it difficult to modify a part of a file. If we use data-centric app that stores data on embedded DBMS such as SQLite, a simple synchronization may incur some loss of information. In this paper we propose a solution to build a personal cloud that supports record-level synchronization. And we show a prototype system which uses RESTful web services and the same schema on mobie devices and the cloud storage. Synchronization is achieved by using a kind of optimistic concurrency control.

• The KIPS Transactions:PartB
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• v.8B no.3
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• pp.283-287
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• 2001

컴퓨터를 이용한 협동작업은 공간적으로 분산되어 있는 여러 작업자들이 동기적 EH는 비동기적으로 협력할 수 있게 함으로써 보다 신속하고 정확하게 작업을 진행할 수 있게 한다. 최근의 협동작업 분야의 급속한 발전은 이제 더 이상 웹 상에서의 협동작업 도구를 메일, 채팅, 화이트보드, 화상회의 등에 한정하지 않고 웹 응용 프로그램들을 협동작업 도구에 포함시키기에 이르렀다. 본 논문에서는 공간적으로 분산되어 있는 여러 작업자들이 상용 웹 브라우저를 이용하여 웹 문서와 웹 데이터베이스 내용을 공유함으로써 보다 효율적인 협동작업을 할 수 있는 시스템을 소개한다. 본 논문에서 소개하는 시스템은 주소 동기화(URL Synchronization), 스크롤 동기화(Scroll Synchronization) 및 윈도우 크기 동기화(Window Size Synchronization) 기능을 제공하여 사용자들이 서로 다른 터미널에서 웹 브라우저를 동기적으로 이용할 수 있게 한다. 주소 동기화는 인터넷 브라우징의 이동과 방향을 동기적으로 제어해주고, 폼 동기화는 웹 페이지 입력을 실시간으로 보여준다. 스크롤 동기화는 웹 페이지의 스크롤을 동기적으로 제어하여 웹 브라우저의 출력 내용이 길어질 경우에도 문서 안의 같은 부분을 공유 할 수 있게 하며 윈도우 크기 동기화는 윈도우의 길이와 넓이를 맞춰준다.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.1
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• pp.62-70
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• 2002

The purpose of this paper in that users can use mobile device applications more easily and efficiently through MoDAM (Mobile Device Application Management) system. MoDAM automates the process of web retrieval for obtaining mobile device applications and the process of installing or updating it on mobile devices and then supply users with these automated services in a step form by combining two separated processes. We implement a web agent conforming to OSD (Open Software Description) specification for automating software retrieval and downloading and also a mobile device based software management module conforming to SyncML (Synchronization Markup Language) specification for synchronizing common data between server and client. The method of automated software retrieval and management for mobile devices using these standard specifications minimizes users' interrupts and also can be applied to traditional several different mobile devices, operating systems or downloading web sites without platform dependent considerations.

• The Transactions of the Korea Information Processing Society
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• v.6 no.11S
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• pp.3420-3433
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• 1999

Since most of CSCW(Computer-Supported Cooperative Work) systems have been developed for particular computing platforms, they are usable only within the specific organizations supporting those particular platforms. Recently, according to the rapid growth and continuing success of the World-Wide Web(WWW or Web) which offers a globally accessible platform-independent infrastructure, many CSCW systems has been constructed and is being developed on the basis of the Web. As one of such CSCW systems, in this paper, we describe the design and implementation of the CoSpace system. The CoSpace system provides shared workspaces, which enable members of a work group easily share information for collaborative work through their Web Browsers. The shared workspaces support information sharing and management between users, and also support event monitoring and synchronization between collaborative works.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1607-1610
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• 2002

모바일 디바이스의 급속한 보급과 사용자층의 증가는 보다 효율적인 정보의 활용능력이 요구된다. 이러한 정보의 활용능력을 증가시키는 방법으로 기준의 웹정보에 대한 모바일 디바이스 활용방법을 들 수 있다. 모바일 디바이스에 대한 기존의 정보 구축방법은 모바일 디바이스 환경에 맞는 정보를 새롭게 구축하고 서비스하는 형태로 진행되었다. 그러나 이러한 방법은 모바일 환경에 적합하도록 정보를 변환하는데 많은 시간과 노력이 필요하다. 이에 본 논문에서는 기존 웹정보를 효율적으로 모바일 디바이스 환경에 활용할 수 있는 방법을 제시한다. 이러한 방법은 웹 정보의 자동 변환과 데이터 동기화를 통해 이루어 질 수 있다. 이를 통하여 정보의 재구축비용을 줄일 수 있고 모바일 디바이스를 이용한 정보활용이 향상되는 효과를 가져온다.