• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.769-772
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• 2005

그동안 우리는 분산응용을 구성하는 자원들을 하나의 논리적인 그룹으로 관리하기 위한 연구를 수행하여 분산객체그룹 프레임워크(Distributed Object Group Framework, DOGF)를 구축하였다. 또한 DOGF 기반에서 분산응용의 복잡한 개발절차를 최소화하고, 이전에 개발된 분산자원들의 재사용성을 효율적으로 제고할 수 있는 분산프로그램 개발도구인 DPD-Tool(Distributed Programming Developing Tool)을 개발하였다. 본 논문에서는 우리가 개발한 GUI 지원 DPD-Tool을 이용한 분산응용의 개발 편리성과 DOGF가 지원하는 그룹관리 분산서비스의 수행성을 검증한다. 이를 위해 GUI 기반에서 분산응용의 예를 들어 서버와 클라이언트 측의 개발절차를 제시하며, 이로부터 DPD-Tool이 DOGF의 지원 서비스를 통하여 그룹화 분산응용 내 중복자원들을 효율적으로 이용하는지 그 수행결과를 확인한다.

• Journal of Internet Computing and Services
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• v.9 no.3
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• pp.25-41
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• 2008

In this paper, we describes a Compact Distributed Object Group Framework(CDOGF) for mobile collaboration service in ubiquitous computing. CDOGF support network connections of sensors and devices, management of mobile computing devices, and grouping of objects for mobile collaboration service according to the logical area. For this, we defined methods for detail functions and interface. And, we classified into four interactions of that sensors and a application, the CDOGF and a application, between the components of the CDOGF, the CDOGF on a mobile device and the DOGF on a server. We also defined mobile collaboration environment by analyzing existing technologies. In this environment we used the TMO scheme for interaction and the TMOSM for distributed middleware. Finally, we implemented u-hospital application that applied this environment. This application collects environment and health information by PDAs in wards. Also, It provides the information service for patient management task.

• Journal of Broadcast Engineering
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• v.17 no.4
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• pp.676-683
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• 2012

Motion estimation in video coding greatly affects implementation complexity. In this paper, a reducing method of the complexity in motion estimation is proposed by using both the depth and color cameras. We obtain object information with video sequence from distance information calculated by depth camera, then perform labeling for grouping pixels within similar distances as the same object. Three search regions (background, inside-object, boundary) are determined adaptively for each of motion estimation blocks within current and reference pictures. If a current block is the inside-object region, then motion is searched within the inside-object region of reference picture. Also if a current block is the background region, then motion is searched within the background region of reference picture. From simulation results, we can see that the proposed method compared to the full search method remains the almost same as the motion estimated difference signal and significantly reduces the searching complexity.

• Journal of Biomedical Engineering Research
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• v.20 no.5
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• pp.529-536
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• 1999

임상적인 응용을 목적으로 하는 전산화 신경 심리 검사 시스템을 개발하였다. 개발된 시스템은 국소적 뇌기능 장애 진단에 뛰어난 14개의 검사록 구성되어 있으며 집중력·언어능력, 공간 및 도형 인지 능력, 기억력, 운동 집중 능력 등을 진단하게 된다. 개발된 시스템은 멀티미디어 객체지향개념에 의거하여 설계 구현되었고, 마이크로소프트 Windows 에 기반을 둔 그래픽 인터페이스를 채용하여 운용이 용이하도록 하였다. 또한 마우스와 터치스크린을 이용하여 피검사자로부터 입력을 손쉽게 받아들 일수 있도록 하였으며, 색체 단어검사, 범주화검사, 언어기억검사들을 한글화하여 검사의 효용성을 향상시켰다. 개발된 시스템을 정상인 그룹과 환자에 적용한 결과 뇌기능 장애 진단에 유용하게 사용될 수 있음을 확인할수 있었다.

• Journal of Advanced Navigation Technology
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• v.13 no.2
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• pp.257-261
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• 2009

This paper propose a new method using Gestalt theory to extract image contour. The proposed method use Gestalt theory based on proximity, similarity and continuation for grouping objects from image segmentation. It use downward feedback and perception to materialize one visual level in image from heterogeneity visual levels in image. The experimental result show that the proposed method achieves better performance than other methods.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.230-233
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• 2010

최근 분산된 노드들 간의 자료를 송수신하는 임베디드 어플리케이션들이 증가함에 따라 이를 지원하기 위한 분산 미들웨어도 함께 발전하고 있다. 분산미들웨어는 원격 객체 관리를 위한 클라이언트-서버 모델, 큐를 이용한 메시지 전송을 목적으로 하는 메시지 패싱 모델, 분산 컴퓨팅 환경에서 자료의 전송을 목적으로 하는 출판-구독 모델이라는 3가지 모델로 분류 된다. 본 논문에서는 3가지 분산 미들웨어 모델들에 대하여 살펴보고 출판-구독 모델의 대표적 분산미들웨어인 Data Distribution Service를 소개한다. 또한 출판-구독 모델이 단말 간 P2P를 지원함에 따라 생기는 문제점인 과다한 트래픽을 해결하기 위해 자료들을 그룹화 시켜 전송하거나 특정 토픽에 관련된 자료들을 미리 예약된 채널을 통해 전송하는 기법들을 제안하고 일반 DDS와 비교를 통해 그 효과를 예측해본다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.135-142
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• 2013

Contour detection is important for many computer vision applications, such as shape discrimination and object recognition. In many cases, local luminance changes turn out to be stronger in textured areas than on object contours. Therefore, local edge features, which only look at a small neighborhood of each pixel, cannot be reliable indicators of the presence of a contour, and some global analysis is needed. The novelty of this operator is that dilation is limited to Deluanary triangular. An efficient implementation is presented. The grouping algorithm is then embedded in a multi-threshold contour detector. At each threshold level, small groups of edges are removed, and contours are completed by means of a generalized reconstruction from markers. Both qualitative and quantitative comparison with existing approaches prove the superiority of the proposed contour detector in terms of larger amount of suppressed texture and more effective detection of low-contrast contour.

• The KIPS Transactions:PartD
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• v.15D no.3
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• pp.411-420
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• 2008

This paper implemented the u-Healthcare Context Information System (HCIS) supporting ubiquitous healthcare by using location, health and titrating environment information collected from sensors/devices equipped in home for healthcare home service. The HCIS is based on the Distributed Object Group Framework (DOGF), a management model which can customize distributed resources, and manages various context information, applications and devices as a group in healthcare home environment, as one more logical units. Also, this system provides continuous healthcare multimedia service considering a resident's location using Mobile Proxy, and the healthcare context information through Context Provider to a resident in home. For verifying execution of our system, we implemented the seamless multimedia service based on resident's location and the prescription/advice and schedule notification/alarm service as healthcare applications in home. And we showed the executing results of healthcare home service by using service device existed in the residential space on which the resident is located according to the healthcare scenario.

• The KIPS Transactions:PartB
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• v.8B no.5
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• pp.493-500
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• 2001

Video scene segmentation is fundamental role for content based video analysis. In this paper, we propose a new region based video scene segmentation method using continuity test for each object region which is segmented by the watershed algorithm for all frames in video data. For this purpose, we first classify video data segments into classes that are the dynamic and static sections according to the object movement rate by comparing the spatial and shape similarity of each region. And then, try to segment each sections by grouping each sections by comparing the neighbor section sections by comparing the neighbor section similarity. Because, this method uses the region which represented on object as a similarity measure, it can segment video scenes efficiently without undesirable fault alarms by illumination and partial changes.

• Journal of Korea Multimedia Society
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• v.15 no.4
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• pp.540-551
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• 2012

Recently, the W3C has developed the HTML5 standard which gives the basis for providing various web applications on the web environments. Because of the advent of the smart devices and the broadband wireless network, users can accesse the web applications on the smart devices at anytime and anywhere. In addition, the demand on the multiscreen services, which enables users to use the appropriate device to their situation, has increased, since users have various smart devices. In this paper, we propose the grouping mechanism of web objects on the HTML5 based web platform, the extraction mechanism of the web object information which is used to create the web object on other devices, and the web object creation mechanism based on the received web object information. In addition, we propose the web service migration architecture between devices on the open web platform and implement the grouping, extraction and creation mechanism of the web objects on the test web document and generic web document with Chrome extension. Finally, we implement the delivery mechanism of the web object information between devices using the node.js and the WebSocket technologies.