• Journal of the HCI Society of Korea
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• v.1 no.2
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• pp.9-17
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• 2006

We propose an EMG-based input interface technology for helping the tetraplegic to utilize mouse, keyboard and power wheelchair. Among possible actions for the tetraplegic utilizing these devices, teeth-clenching is chosen as an input action. By clenching left, right or both teeth, and controlling the clenching duration, several input commands for utilizing the devices can be conducted. EMG signals generated by teeth-clenching are acquired around one's left and right temples and they are used as control sources for utilizing the devices. We develop signal acquisition devices, signal processing algorithms, and prototype systems such as power wheelchair control, mouse control, and game control. Our experimental results with the tetraplegic show that the proposed method is useful for utilizing the devices.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1511-1514
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• 2012

최근 기업에서 구축하는 IT 아키텍쳐가 점점 복잡해져 가는 환경변화에 따라 각 시스템 구성요소의 조건이나 특성을 저장하는 설정파일(Configuration file)의 중요성이 강조되고 있지만, 대부분의 형상관리시스템이 응응 소프트웨어를 중심으로 구성되어 설정파일의 특징을 반영한 활동에 한계를 갖고 있다. 또한 품질보증 목적으로 수행하는 형상감사 활동도 응용 소프트웨어를 대상으로 품질중심 감사 활동이 이루어지면서, 등록된 개별 소프트웨어 별로 변경통제와 버전관리가 이루어져 설정 파일이 포함되는 경우 버전 무결성 차원의 문제를 적발하지 못하는 문제가 있다. 이 논문에서는 추가적으로 필요한 감사활동 요구기능을 정의하고, 동일한 원본에서 배포된 설정파일들이 서로 버전이 다르게 관리 될 수 있는 문제를 감사(Audit)를 통해 탐지할 수 있는 버전 무결성 감사 프레임워크를 제시한다. 제안하는 프레임워크는 기존 형상관리 개념과 액티비티, 프로세스를 기반으로 감사기능을 보완한다. 이를 통해 기존 감사활동에 버전 무결성 검증을 수행하는 형상감사 기능이 포함되며, 이는 설정파일의 버전 차이에 의해 사전/사후 발생될 장애, 오동작 등의 문제 해결에 활용된다. 이 논문에서 제안 프레임워크의 검증을 위하여 웹 시스템 기반 자바환경으로 구현하였고, 현장 적용한 부분을 평가 함으로써 검증하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.9
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• pp.880-886
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• 2014

Many railway signalling functions have increasingly depended on computer software with recent development in computing technology, leading to evolution into more flexible and intelligent railway signalling system. Meanwhile, software programs are likely to have many errors and the cost incurred by such errors has increased. Especially, if fatal software error occurs during railway operation, it may result in loss of lives. So the software verification and validation have become more important. It is needed for software functional safety tool to support these, but most commercial tools depend on direct access to the system's memory, resulting in many difficulties in application. Owing to such difficulties and complexity, they are rarely used in railway signalling system software validation. In this study, a new testing tool for software functional testing through an external interface that can be easily used in functional testing of software was developed. Such testing tool allows development and analysis of test cases for black-box testing through analysis of actually used interface protocols, leading to increased user convenience.

• Journal of the Korea Society of Computer and Information
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• v.27 no.3
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• pp.209-216
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• 2022

In this paper, we propose an effective software education program to promote employment of the disabled and verify the effectiveness of SW education through pilot operation. In this SW education program, we develop a SW curriculum consisting of the basic course, Unity programming course, and the advanced course, AR/VR digital content development course. The SW education achievement standard develops the basic and advanced course achievement standards in consideration of the level of the virtual reality content production job of the National Competency Standards(NCS) and the SW education achievement standards of youth with visual, hearing, and physical disabilities. SW education materials are developed on a project basis so that one AR/VR digital content can be implemented step by step according to the intellectual level of the disabled based on Unity. SW education pilot training is conducted as online education based on Blended Learning due to COVID-19. In order to derive the SW education effect and each learner's individual SW education academic achievement for the SW education pilot training, a survey is conducted on learners, and the results are analyzed. In the basic course, 77.3% of learners achieved academic achievement above excellent(80-90), and in the advanced course, 48.8% of learners achieved academic achievement above excellent(80-90). These results verify that the SW education program for the disabled developed in this paper is effective in activating employment for the disabled.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2008.10a
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• pp.136-140
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• 2008

분산된 아키텍처 구조하에서의 정보시스템 구성은 처리해야 할 정보의 양에 따라 서버의 수가 증가될 수 밖에 없으며, 다수의 하드웨어와 운영체제 그리고 다양한 소프트웨어를 운영하여야 하므로 운영 및 관리의 리스크와 비용은 급격히 증가하게 된다. 이를 해결하기 위하여 그동안 도입 서버의 통합기술, 시스템 이중화 기술 등이 개발되어 적용되었으며, 수년전부터는 ITSM 프레임워크 도입되어 시스템의 운영과 관리의 효율성을 높이고자 하였다. 본 논문에서는 시스템 운영관리의 핵심지표인 가동율에 영향을 미치는 장애현황을 요인별로 분석하여 ITSM 프레임워크하에서 운영되는 정보시스템 운영관리 프로세스의 적용 효과를 측정하고 운영관리프로세스의 바람직한 개선 모델을 제시하고자 한다.

• The KIPS Transactions:PartD
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• v.12D no.6 s.102
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• pp.875-880
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• 2005

Recently web services ale being used to provide environments of distributed computing. Web services provide reusable software component. So, one web service can be used by many users, and one user can use different web services. For reliable use of web services, in these cases, it is important to be fault-tolerance. Existing fault-tolerant methods in web services need a kind of client modification and cannot consider extensible factors like quality. This study suggests the system architecture and description language for the system which can improve some of these problems.

• Journal of Digital Contents Society
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• v.12 no.3
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• pp.291-298
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• 2011

The DAISY, an international digital talking book standard, has been established to help reading-disabled people read books normally. As many societies' interests in reading-disabled people are arising, reading environment for them is also getting improved by supplying alternative books. In the digital world, however, there is still lack of e-book playing software for them. In this paper, we design and partially implement an android smartphone e-book viewer. By analyzing the features and relations of DAISY3 files, we can find several important design points to properly implement DAISY3 viewer. We are sure, when using our results, that various DAISY3-compliant e-book viewers can be implemented easily and quickly.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.486-489
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• 2013

현재 IT 인프라 기술이 상당한 발전을 이루고 있으며 고급 인프라를 활용한 IT 기술들이 나날이 발전하고 있다. 지금의 정보화 사회에 지대한 영향을 미치고 있는 인터넷을 포함한 수 많은 IT 정보기술들은 각 사회분야에 걸쳐 해당 분야의 정보의 질을 높이고 있다. CTI (Computer Telephony Integration) 기반 콜센터 시스템 또한 IT 인프라의 발전에 발 맞추어 효율적인 정보 제공을 위한 정보 기술이 상당히 많이 발전해왔다. 기존의 콜센터 시스템은 PSTN 망 기반의 전화 중심의 정보제공만 가능한 반면에, 현재 콜센터 시스템은 PSTN 기반이 아닌 IP 기반 인프라를 활용하여 IP 기반으로 제공할 수 있는 여러 기술을 접목시킨 하나의 통합 솔루션 시스템으로 발전하고 있다. 콜과 관련된 서비스만 제공하는 것이 아니라 Fax, E-mail, Instance Messaging 등 여러종류의 서비스를 제공하기 위해 시스템 구성이 변화하고 있는 추세이다. 하지만 현재 콜센터 시스템은 청각장애인을 위해 제공할 수 있는 서비스가 존재하지 않으며 이에 대한 연구 또한 미비한 상태이다. 이에 본 논문에서는 청각장애인을 위한 서비스 제공을 위해 스마트폰 인프라에서 서비스를 제공 받을 수 있는 CTI 시스템을 설계 하였다.

• Journal of KIISE:Software and Applications
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• v.36 no.4
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• pp.291-297
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• 2009

This paper introduces an electronic travel aid, named SmartWand, which detects obstacles using a ultrasonic sensor. In addition to obstacle detection, the SmartWand senses color information of objects and the environmental brightness. It is designed to be attached to a ordinary white cane in order to detect the obstacles at head-hight which cannot be covered by the cane. We have improved the first version of the SmartWand based on a user evaluation. The second version is much lighter and smaller than the previous one. It has been enhanced by two new functions. The SmartWand eliminates impact errors due to tapping the ground using a moving average filtering algorithm and restricts the detection range to the path in the moving direction using an acceleration sensor. We have tested these functions in various environments to determine the parameters for these functions.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.7
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• pp.1740-1746
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• 2013

Augmentative and alternative communication(AAC) is a communication tool for those with impairments or restrictions on the production or comprehension of spoken language. Traditional AAC has used a portable board with pictures and texts with which disabled person could be supported by it. Currently, smart phone based AAC researches and developments are actively studying. With emerging concepts of context-aware computing, the mobile devices can provide mobile users with timely information and location based services. We proposed a adjustable AAC system for disabled people of which has variable layouts and selectable items. We also implemented context-ware application for AAC systems including time, location and click count informations on smart phone. The system can adaptively change its layout and select AAC items depending on various situation of disabled persons.