• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.157-159
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• 2004

본 논문에서는 분산 일시간 객체 엔진을 내장하는 TMO-LINUX/ARM 커널 상에서, 각종 센서 및 모터 제어로 구성되는 로봇 제어 시스템을 동적 분산 실시간 객체인 TMO로 모델링하고 구현하였다. TMO(Time-triggered Message-triggered Object)는 시간적 조건에 의해 구동되는 객체 내의 실시간 스레드와 메시지에 의해 구동되어 주어진 데드라인 안에 작업을 수행하는 메시지 구동 실시간 스레드들의 동적 멤버들로 구성되는 실시간 객체로, 외부의 입출력에 반응하며 내부 장치에 대한 실시간 작업을 병행해야 하는 로봇 제어 시스템에 대해 매우 적합한 모델이다. 본 논문에서는 이러한 로봇 제어 시스템 설계에의 TMO의 적용이 잘 정의되고 규격적인 설계 모델을 제공함을 보인다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.39-42
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• 2003

A community can have a physical presence or can be formed from a group of people who communicate remotely via a conference call, a fixed Internet chatroom or instant message solution and most recently, a mobile handset. The mobile handset gives community members the advantage over fixed line or physical communities that they are not constricted by time or place as to when they can communicate with any members of their community. Operators, riding on the back of the SMS boom, are deploying community applications to increase both average revenue per user and customer loyalty. The purpose of this study is to find the effects of the characteristics of mobile community on the consumers'satisfaction and loyalty so that operators'participation in mobile community could be enhanced. A general model for the study was proposed with three independent variables. The variables are community usability(dialog and social support, information design, navigation, access), community sociability (purpose, people, policies), and mobile community content(location, personalization, immediacy, availability).

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.502-505
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• 2011

RT-eCos3.0은 대표적 분산 실시간 객체 모델인 TMO(Time-triggered Message-triggered Object)의 실행을 제공하기 위하여 공개소스 eCos3.0 기반으로 개발된 초경량 경성 실시간 임베디드 운영체제이다. RT-eCos3.0에서는 분산 컴퓨팅 지원을 위하여 네트워크에 투명한 채널 기반 publisher/subscriber 모델의 멀티캐스트 분산 IPC를 지원하고 있다. 본 논문에서는 이와 같은 기존의 분산 IPC를 이용하여 보다 더 직관적인 분산 동기화 read/write 인터페이스를 제공하는 객체 기반의 분산 공유 메모리 시스템을 설계/구현하였다. 구현된 분산 공유 메모리는 각 로컬 노드의 캐시 객체의 사용으로 가능한 한 최소한의 네트워크 통신으로 동기화가 가능하도록 설계 구현되었다.

• Journal of the Korea Society for Simulation
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• v.3 no.1
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• pp.115-124
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• 1994

In this paper, we have developed a performance analysis tool for communication networks called COMNAS. COMNAS analyses the performance of wide area networks such as Korea Educational Network and Korea Research Environment Open Network which include local area networks such as Ethernet and Token Ring. COMNAS consists of model constructor, simulation implementor, output analyzer and user interface. Attributes of communication networks for modeling either have default values or are entered by user as object units, and implementation of simulation is automatically proceeded by user interface. Ouput results obtained by COMNAS are the status of node, link and entire network such as mean message transmission delay, throughput, utilization, and so on, and they can be selectively obtained upon the request of the user.

• Journal of the Korea Society of Computer and Information
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• v.21 no.3
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• pp.25-32
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• 2016

Mobile Ad Hoc Networks(MANETs) consists of mobile nodes which communicate with each other without any centralized infrastructure. Message broadcasting by flooding for route discovery in MANET can result in high redundant retransmission, contention and collision of broadcasting packet, known as the broadcast storm problem collectively. The cross-layer design is adopted in this paper, which lets routing layer share the received signal strength information at MAC layer. Also this paper proposes a new probabilistic approach that dynamically adjusts the rebroadcasting probability of a node for routing request packets (RREQs) according to the received signal strength. The simulation results show that the proposed approach demonstrates better performance than blind flooding, fixed probabilistic broadcasting approaches.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8
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• pp.2514-2519
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• 2000

As applications of mobile agent become manifold, it is needed that the agent collaboration using group agents. This collaboration needs a lot of communications among agents for informations sharing and work coordination. In this paper we propose CMP for which efficient collaboration work between group agent. CMP is synchronous or asynchronously performs flexible information transfer among agents. Also, It can perform efficiently in group agent model because proposed methods provide not olny one to one but also many to many communication.

• Journal of Contemporary Eastern Asia
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• v.13 no.2
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• pp.3-14
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• 2014

Online communities are an important source of electronic-word-of-mouth (eWOM), however few studies have examined these types of messages within the Middle Eastern context. This study focuses on Kuwaiti women as members of an online beauty forum; previous work has suggested a mediating effect of gender with women being more likely to trust and follow-up word-of-mouth with a purchase. A conceptual model, based on existing theoretical contributions, provides the basis of a coding framework for the message characteristics that influence members' eWOM adoption. A sub-set of the analysis is presented: 218 threads (1820 messages, coded into 6702 units) illustrating cases where eWOM was adopted and thereby demonstrating continuance intention with members returning to the forum. Content analysis revealed the prevalence of emotional aspects in messages, coded into a new category of 'community bonding'. Findings show that emotion expressed in messages is as influential and important as cognitive aspects of argument quality.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.101-105
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• 1997

This paper presents the worst-case time-delay in CAN(Controller Area Network) system through the mathematical model. Time-delay in the CAN system is devided into a generation delay, a transmission delay and a delivery delay. This paper also measures the performance represented in terms of the number of station, transmission speed, data size etc. by using the computer simulation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.616-617
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• 2013

This paper introduces a new method that controls a humanoid robot detecting a human motion using a Kinect sensor. Processing the output of a depth seneor of the Kinect sensor, we build a human stick model which represents each joint of human body. We detect a specific motion by calculating the distance and angle between joints. We send the control message to the robot using Bluetooth wireless communication.

• Journal of Korea Society of Digital Industry and Information Management
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• v.7 no.2
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• pp.19-27
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• 2011

Recent development of information technologies produces a lot of community services. Social Network Service is one of the community services on the world wide webs. In the Social Network Service, a user can register other users as friends and enjoy communication through a virtual message. Previous researches show a few social service methods using manually generated tagging. However, the manual social tagging is not widely used in many social network services. Moreover, they do not consider ubiquitous computing environment. We propose a recommendation method for social service using contexts in ubiquitous environment. Our method scores documents based on context tags and social network services. Our social scoring model is computed by both a tagging score of a document and a tagging score of a document that was tagged by a user's friends.