• 전자공학회논문지
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• 제54권5호
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• pp.48-61
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• 2017

클라우드 컴퓨팅의 IaaS 서비스는 유지비용 없이 원하는 만큼의 고성능 가상 머신을 사용할 수 있다는 장점 덕분에 대용량 병렬 프로그램을 실행하기 위한 고성능 컴퓨팅 환경으로 주목받고 있다. 이러한 고성능 컴퓨팅 환경에서 병렬 프로그램의 실행에 소요되는 시간은 태스크 스케줄링 알고리즘에 좌우된다. 클라우드 컴퓨팅 환경을 기반으로 하는 태스크 스케줄링 알고리즘에 관한 연구는 사용자 부담 비용을 최소화하는 알고리즘이 주류를 이루었으며, 병렬 프로그램의 실행을 최대한 빨리 끝내기 위한 알고리즘에 관한 연구는 거의 이루어지지 않았다. 본 논문에서는 사용자 부담 비용 등의 제약 없이 병렬 프로그램을 최대한 빨리 끝내기 위한 알고리즘인 HAGD 알고리즘과, HAGD 알고리즘이 사용하는 새로운 성능 향상 기법인 묶음 태스크 복제 기법을 제안한다. 묶음 태스크 복제 기법은 기존 태스크 복제 기법을 단순화하였으며, HAGD 알고리즘은 고성능 컴퓨팅 환경과 병렬 프로그램의 특성에 맞추어 태스크 삽입 기법 혹은 묶음 태스크 복제 기법을 사용한다. 성능 평가 결과, 제안하는 알고리즘이 환경 특성과 관계없이 우수한 표준화한 전체 실행 시간을 제공하는 것을 확인하였다.

• 디지털융복합연구
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• 제1권1호
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• pp.45-67
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• 2003

Developing user success metric will make it possible to evaluate the effectiveness of different electronic government systems and will help produce empirical data relating user success to task performance in electronic government environments. The purpose of this study is that combining output-oriented and interaction-oriented variables together into a single model might explain more of the variance in the dependent variable user success in a electronic government than either type of variable could have explained alone. The hypothesized reason is that user success is the result of the reciprocal effects of the properties of the information system and several facets of psychological functioning. Thus, the complex interplay between the system and the user in certain situational contorts may produce different degrees of user success with electronic governments.

• 한국정보시스템학회지:정보시스템연구
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• 제8권1호
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• pp.131-148
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• 1999

The objective of this study is to analyze the relationship between the success factors(organizational agreement, task fitness, top management support, user involvement, and linkage between BPR and ERP systems) and the performance(user satisfaction) of ERP systems. The success factors of concern would show positive relationships with the user satisfaction. Data were collected from 57 firms that have installed ERP systems. The responding firms were asked to visit the website of the researcher for the questionnaire survey. The result showed a positive relationship between the organizational agreement and the user satisfaction. This study also found that the user involvement had a negative relationship with the user satisfaction. The findings suggest that the firms adopting ERP systems need to establish the organizational agreement on the ERP system development which would be the critical factor for the successful system. It is also suggested that the user involvement should be controlled for the successful ERP systems.

• Journal of Multimedia Information System
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• 제5권1호
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• pp.59-62
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• 2018

The delay between input action and visual interface feedback ("Latency") in a touchscreen inking task reduces the user's performance. When the latency is less than 2.38ms, the user cannot perceive the latency in dragging task. This value is difficult to achieve on recent touchscreens and general purpose computers. So, methods of predicting touch points to reduce perceptible latency has been proposed. In general, touch points prediction is not perfect. When using point prediction, feedback of the predicted points is displayed on the screen, after a while, erased when the actual points are displayed. When this task is implemented by software, it causes additional latency to work to erase predicted points feedback. It therefore propose a platform for rendering point prediction feedback without additional latency by the FPGA. This platform transmits input points and HDMI signals rendering feedback of input points to the FPGA. The FPGA draws the feedback of points predicted based on the input points on the HDMI and displays the screen. Since hardware rendering changes the HDMI signal every frame, it does not require erasing work and rendering can be done within an early time regardless of the amount of rendering, so we will reduce the latency.

• 한국컴퓨터산업학회논문지
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• 제3권3호
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• pp.351-362
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• 2002

SNMP 관리 영역이 네트워크에서 시스템, 요금데이터 등 다양한 영역으로 확대되고, 보다 중요한 데이터를 전송하는 수단으로 사용된다. SNMPv3는 사용자그룹기반의 view기반 보안모델을 통한 보안강화 기능을 제공한다. 그러나, view기반보안모델을 이용한 보안관리는 데이터 접근목적에 연관된 접근제어 기능이 없고, 다양한 사용자그룹 생성에 따른 관리의 복잡성이 증대되는 문제가 있다. 따라서, 이러한 관리의 복잡성 문제를 해결하고, 보안강화를 하기 위한 직무기반 보안모델을 통한 접근강화 방법을 제안한다. 제안된 직무기반 보안관리는 관리대상에 따라 네트워크관리자 직무, 시스템 관리자 또는 계정관리자 등의 직무로 구분하여 직무를 통한 접근을 제한하여 관리의 복잡성을 해소하고, 직무와 목적간 관계를 확인하여 보다 강화된 보안기능을 제공한다.

• 로봇학회논문지
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• 제6권4호
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• pp.344-352
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• 2011

A mobile manipulator is a system with a robotic manipulator mounted on top of a mobile base. It has both indoor and outdoor applications for transporting or transferring materials. When a user gives commands, they are usually at high levels such as "move the object to the table," or "tidy the room." By intelligently decomposing these complex commands into several subtasks, the mobile manipulator can perform the tasks with a greater efficiency. One of the crucial subtasks for these commands is the pick-and-place task. For the mobile manipulator, selection of a good base position and orientation is essential to accomplishing this task. This paper presents an algorithm that determines one of the position and orientation of a mobile manipulator in order to complete the pick-and-place task without human intervention. Its effectiveness are shown for a mobile manipulator with 9 degrees-of-freedom in simulation.

• 한국정밀공학회지
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• 제14권7호
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• pp.126-136
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• 1997

This paper describes a task level cell programming environment that deals with difficulties in programming Flexible Manufacturing Cells (FMCs), and consists of the cell programming editor and the automatic generation module. In the cell programming editor, cell programs can be developed with task- oriented cell specifications that reduces the amount of details to be considered by cell programmers. The automatic generation module transforms task specifications into executable programs used by cell constituents. The development tool in designing the environment is an object-oriented approach which provides a simple to use and intuitive user interface, and allows for an easy development of object models associated with the environment. Test results are illustrated in order to demonstrate the applicability of the developed envifonment.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권5호
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• pp.519-524
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• 2010

이 논문은 유비쿼터스 환경에서 사용자의 서비스 조합 요구를 만족시키기 위한 오퍼레이션 단위의 태스크 조합 방법을 제안한다. 이 방법은 서비스 컴포넌트 아키텍처를 따르며 태스크 조합 시 시스템의 자동화를 위해 시맨틱 웹을 활용한다. 또한, 태스크 조합을 지원하기 위한 태스크 온톨로지(universal Task Ontology)에 대해 소개한다. 태스크 온톨로지 u-TO에서는 태스크 간의 계층구조를 표현하고, 태스크를 관점(View)에 따라 분류함으로써 사용자가 보다 쉽게 자신의 태스크를 정의하고 태스크를 수행할 수 있는 오퍼레이션을 검색하고 활용할 수 있도록 하였다.

• 전자통신동향분석
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• 제32권5호
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• pp.117-126
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• 2017

With the advances of high-performance, lightweight hardware components and control software, unmanned aerial vehicles (UAVs) have expanded in terms of use, not only for military applications but also for civilian applications. To complete their task at a remote location, UAVs are generally equipped with a camera, and various sensors and types of hardware devices can be attached according to the particular task. When UAVs capture video images and transmit them into the user's interface, augmented reality (AR) and virtual reality (VR) technologies as a user interface may have advantages in controlling the UAV. In this paper, we review AR and VR applications for UAVs and discuss their future directions.

• 디지털산업정보학회논문지
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• 제6권1호
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• pp.143-149
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• 2010

In ubiquitous environment, information retrieval using collaborative filtering is a popular technique for reducing information overload. Collaborative filtering systems can produce personal recommendations by computing the similarity between your preference and the one of other people. We integrate the collaboration filtering method and context-aware information retrieval method. The proposed method enables to find some relevant information to specific user's contexts. It aims to makes more effective information retrieval to the users. The proposed method is conceptually comprised of two main tasks. The first task is to tag context tags by automatic tagging technique. The second task is to recommend items for each user's contexts integrating collaborative filtering and information retrieval. We describe a new integration method algorithm and then present a u-commerce application prototype.