• 제목/요약/키워드: Distributed Software Development

검색결과 272건 처리시간 0.031초

베이비붐세대의 디지털라이프 지수 (Digital Life Index of Babyboom Generation)

  • 권순재;김미령
    • 한국정보시스템학회지:정보시스템연구
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    • 제23권1호
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    • pp.161-184
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    • 2014
  • Our study measures the Digital Life Index (DLI) of baby boomers by considering the utilization of digital devices in their everyday life. The study was conducted by implementing the following three-step approach: (1) development of survey questions and data collection; (2) build Digital Life Index (DLI) model and lastly; (3) empirical analysis using the Digital Life Index (DLI). In the first stage in order to develop the survey questions to measure the digital index, two surveys were conducted. For the first preliminary survey, it was done based on the existing literatures which enabled this investigation through FGI analysis involving real professionals. The second survey was conducted by commissioning a specialized external firm. In this survey, a total of 400 data was collected to verify the validity and objectivity of the data sample. The data gathered through the survey questions was used to develop the digital index. Firstly, the appropriate factors were extracted by conducting factor analysis. This factor analysis validates and verifies the factors which are appropriate in measuring Digital Life Index (DLI). The derived factors are broadly divided into five main factors. The first factor describes the possession, purchase and use of digital device (x1). Meanwhile, the second factor describes the digital device's software (x2) and the third factor describes the participation in utilizing digital device (x3). The fourth factor describes the utilization of digital device in human personal relationship (x4) and lastly, the fifth factor describes the effect of digital device in everyday life and work environment (x5). Secondly, the digital index model was developed. The variables to represent the Digital Life Index (DLI) are ${\chi}1t,{\chi}2t,{\chi}3t,{\chi}4t$ and ${\chi}5t$. Furthermore, as experience in using the digital index grows overtime, the growth can be represented by the "S" shape. Based on the results, Digital Life Index(DLI) is distributed with the highest point at 90.3 and the lowest point at 25.9.

SOA 기반의 U-City 서비스 통합 아키텍처 (SOA-based Integrated U-City Service Architecture)

  • 이강표;임영석;안재민;유진수;김형주
    • 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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    • 제16권3호
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    • pp.257-262
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    • 2010
  • 최근 각광 받고 있는 SOA(Service-Oriented Architecture)는 서비스 지향 아키텍처로서, 소프트웨어 개발 및 응용의 새로운 패러다임이라고 할 수 있다. 본 논문에서는 서비스 통합의 중요성이 강조되는 U-City 사업에서 SOA를 기반으로 다양한 서비스들을 효과적으로 관리, 제어할 수 있는 통합 아키텍처를 제시한다. SOA의 주요 특정이라고 할 수 있는 느슨한 결합, 표준 기반, 그리고 분산 컴퓨팅은 U-City 사업의 다양한 서비스를 통합하여 제공하기 위한 필수적인 요소들이다. 본 연구에서는 SOA의 이러한 특징들을 반영하기 위해 통합 플랫폼인 ESB(Enterprise Service Bus)를 이용하였는데, ESB는 상호 이질적인 컴포넌트와 시스템을 연결함으로써 서비스들 간의 통신을 구현하는 SOA의 핵심 모듈이 라고 할 수 있다. 본 논문에서는 U-City 서비스에서 SOA의 필요성과 이를 실제로 구현할 수 있는 가상 시나리오와 구현방법에 대해 논한다. 최종적으로 U-City 통합운영센터를 위한 SOA 기반 통합 아키텍처를 제안한다.

필드버스 시스템에서의 기기통합에 관한 연구 (A Study about the Device Integration in Fieldbus System)

  • 문용선;이명복;정철호
    • 한국정보통신학회논문지
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    • 제8권2호
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    • pp.324-330
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    • 2004
  • 필드버스 시스템에서 필드기기를 제어전략에 맞게 제어시스템으로 통합하기 위해서는 기능 및 내부 파라미터가 기술되어 있는 DD(Device Description)를 구성 소프트웨어에 제공하여야 한다. 현재 DD는 DDL (Device Description Language)로 작성되며, IEC 61804-PART 2로 제정되어, 필드버스인 Profibus, Foundation Fieldbus, HART 시스템에서 사용하고 있다. 그러나 DD 기술은 필드버스에 종속적이며, 최근 많은 발전을 보이고 있는 산업용 이더넷 환경에 적합한 형식을 갖추고 있지 않다 따라서 본 논문에서는 필드버스에 종속적이지 않고, 산업용 이더넷 환경에 적합한 형식을 갖춘 XML(extensible Markup Language)를 이용하여 필드기기의 내부 기능 및 파라미터를 XDD(XML for Device Description)로 표현하고자 한다 또한 앞으로 산업현장에서 이더넷의 발전 가능성을 살펴봄으로써, 분산제어시스템에서 XDD의 적용 관한 향후 연구과제를 제시한다.

공유가상공간에서 다중경로샘플링을 이용한 동적 이벤트 필터링 기법 (A Dynamic Event Filtering Technique using Multi-Level Path Sampling in a Shared Virtual Environment)

  • 유석종;최윤철;고견
    • 한국정보과학회논문지:소프트웨어및응용
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    • 제26권11호
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    • pp.1306-1313
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    • 1999
  • 본 연구는 인터넷 기반 공유가상공간에서 시스템의 확장성을 유지하기 위하여 이동객체를 대상으로 하는 이벤트 필터링 기법을 제안하고자 한다. 제안된 다중격자 모델 기법은 이동객체의 경로 상에서 대표적인 이벤트를 샘플링하는 방식을 사용한다. 이 방식은 메시지 트래픽의 양을 동적으로 조절하기 위하여 이동객체 간의 관심정도 정보를 수치적으로 변환하여 이벤트 갱신빈도에 반영한다. 대량의 이동객체를 생성하여 제안된 기법을 적용한 성능평가 실험에서 기존의 방식에 비하여 평균 메시지 전송량이 50%이상 감소하는 것으로 확인할 수 있었다. 다중격자 모델은 참여자의 수와 메시지 트래픽 상황에 따라 가상환경의 공유 QoS를 동적으로 조절할 수 있으며, 인터넷 상에서 다수 사용자를 위한 3차원 가상사회 구축 및 온라인 네트워크 게임 개발 등에 활용될 수 있을 것이다.Abstract This paper proposes an event filtering technique that can dynamically control a large amount of event messages produced by moving objects like avatars or autonomous objects in a distributed virtual environment. The proposed multi-level grid model technique uses the method that extracts the representative events from the paths of moving objects. For dynamic control of message traffics, this technique digitizes the DOIs of the avatars and reflects the interest information controlling the frequency of message transmission. For the performance evaluation, a large number of moving objects were created and the model was applied to these avatar groups. In the experiments, more than 50% of messages have been reduced in comparison with the existing AOI-based filtering techniques. The proposed technique can dynamically control the QoS in proportion to the number of users and the amount of messages where a large number of users share a virtual space. This model can be applied to the development of 3D collaborative virtual societies and multi-user online games in the Internet.

A Crew Location Recognition System for a Naval Ship by Applying Ubiquitous Technologies

  • Lee, Jin-Tae;Cho, Seong-Rak;Kim, Seong-Jeon
    • Journal of Ship and Ocean Technology
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    • 제12권3호
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    • pp.26-35
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    • 2008
  • Recognition of real time locations of crews for a naval ship is important, not only for the operation efficiency but also for the safety of onboard crews in the ship. More than 100 crews are dwelling in a modem naval ship and they are involved in various duties. Moreover many visitors come in and out frequently while the ship is moored in a harbor. It sometimes requires considerable time and efforts to find a person for urgent mission. It would enhance the operational efficiency if locations of onboard crews are recognized and monitored in real time. An active type RFID tag, which has a specific ID number, is distributed to each crew member, which should be carried during his stay in the ship. A number of fixed type RFID readers are to be located at the major passages of the ship, which are connected to the main computer via Local Area Network. The location of a crew would be identified by the ID number of his RFID tag and the location of the RFID reader which detected the RFID tag. A middleware is needed to process the collected data in the main computer. The data is fed to application softwares, which actually display locations of the concerned crews. The software is coded using GUI (Graphic User Interface) for better user friendliness, which has the function of storing the location history of a crew, and sending warning messages to appropriate persons, if unallowable behavior is detected. An auxiliary naval ship is selected for an experimental application study of the proposed system. It turns out that the required budget and time for the realization of the system is within the allowable limits. But complementary measures to protect the privacy of onboard crews should be considered and adopted, before the application of the system is realized.

탈중앙화 신원증명에 기반한 본인 인증 모델 (A Model for Self-Authentication Based on Decentralized Identifier)

  • 김호윤;한군희;신승수
    • 융합정보논문지
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    • 제11권11호
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    • pp.66-74
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    • 2021
  • 인터넷이 발달하면서 온라인에서 나를 증명하는 사용자 인증기술은 고도화되고 있다. 기존 ID 방식은 서비스 제공자가 개인정보를 관리하며 보안이 취약할 경우 개인정보 유출의 위협이 있고, 정보 주체가 서비스 제공자에게 있다. 본 연구에서는 온라인 신분 확인 기술이 발전함에 따라 중앙집중 형식에서 오는 개인정보 유출 위협을 낮추고 사용자 주권 강화를 위한 DID 기반 본인 인증 모델을 제안한다. 제안 모델은 발행기관으로부터 발급받은 VC를 통해 사용자가 직접 개인정보를 관리하고 정보 주제가 사용자에게 있어 주권을 강화할 수 있다. 연구 방법으로는 분산원장 기술을 기반으로 한 탈중앙화 신원증명 방법을 이용하여 보안성과 무결성을 보장하는 본인 인증 모델을 제시하고, 공격방식에 대한 보안성을 분석한다. 공개키 암호 알고리즘을 사용하는 DID Auth를 통해 인증하여 스니핑, 중간자공격 등으로부터 안전하며 제안 모델은 실물 신분증을 대체할 수 있다.

모튼이펙트 해석을 위한 동역학-구조-유체-열전달 시간과도응답 연성해석 시차적분법에서 시상수 효과 분석 (Analysis of Integration Factor Effect in Dynamic-Structure-Fluid-Heat Coupled Time Transient Staggered Integration Scheme for Morton Effect Analysis)

  • 서준호;정승화
    • Tribology and Lubricants
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    • 제35권1호
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    • pp.77-86
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    • 2019
  • The present study focuses on the effect of staggered integration factor (SIF) on Morton effect simulation results. The Morton effect is a synchronous rotordynamic instability problem caused by the temperature differential across the journal in fluid film bearings. Convection and conduction of heat in the thin film displaces the hot spot, which is the hottest circumferential position in the thin film, from -20 to 40 degrees ahead of the high spot, where the minimum film clearance is experienced. The temperature differential across the journal causes a bending moment and the corresponding thermal bow in the rotating frame acts like a distributed synchronous excitation in the fixed frame. This thermal bow may cause increased vibrations and continued growth of the synchronous orbit into a limit cycle. The SIF is developed assuming that the response of the rotor-lubricant-bearing dynamic system is much quicker than that of the bearing-journal thermal system, and it is defined as the ratio between the simulation time of the thermal system and the rotor-spinning period. The use of the SIF is unavoidable for efficient computing. The value of the SIF is chosen empirically by the software users as a value between 100 and 400. However, the effect of the SIF on Morton effect simulation results has not been investigated. This research produces simulation results with different values of SIF.

Development of Virtual Reality-based Visual Perception and Cognitive Rehabilitation Service

  • Song, YoHan;Kim, JinCheol;Lee, JeongA;Han, Shin;Lim, YoonGyung;Lee, HyunMin
    • The Journal of Korean Physical Therapy
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    • 제31권2호
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    • pp.67-75
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    • 2019
  • Purpose: Patients with brain damage suffer from limitations in performing the activities of daily living (ADL) because of their motor function and visual perception impairment. The aim of this study was to help improve the motor function and visual perception ability of patients with brain damage by providing them with virtual reality-based contents. The usability results of the patients and specialists group were also evaluated. Methods: The ADL contents consisted of living room, kitchen, veranda, and convenience store, similar to a real home environment, and these were organized by a rehabilitation specialist (e.g., neurologist, physiotherapist, and occupational therapist). The contents consisted of tasks, such as turning on the living room lights, organizing the drawers, organizing the kitchen, watering the plants on the veranda, and buying products at convenience stores. To evaluate the usability of the virtual reality-based visual cognitive rehabilitation service, general elderly subjects (n=11), stroke patients (n=7), stroke patients with visual impairment (n=4), and rehabilitation specialists (n=11) were selected. The questionnaires were distributed to the subjects who were using the service, and the subjective satisfaction of individual users was obtained as data. The data were analyzed using SPSS 21.0 software. The general characteristics of the users and the evaluation scores of the experts were analyzed using descriptive statistics. Results: The usability test result of this study showed that the mean value of the questionnaire related to content understanding and difficulty was high, between 4-5 points. Conclusion: The virtual reality rehabilitation service of this study is an efficient service that can improve the function, interest, and motivation of stroke patients.

유아기 맞벌이 부부의 일-가족균형, 회복탄력성이 행복에 미치는 영향: 직무만족도와 양육효능감의 매개효과 (Structural relationships among work-family balance, resilience, job satisfaction, parenting self efficacy, and happiness of double income couples with 3-5 years old child(ren))

  • 하쾌남;정민자
    • 한국가족관계학회지
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    • 제22권1호
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    • pp.111-134
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    • 2017
  • Objective: The purpose of this study is to verify the structural relationships among work-family balance, resilience, job satisfaction, parenting self-efficacy and happiness of double income couples with 3~5 years child(ren). Method: This study distributed structured self-reported questionnaires and used the data of 229 couples with 3~5 years child(ren) for an analysis. A confirmatory factor analysis was conducted for checking the measurement unity and a structural equation model was performed to reveal the structural relationship using AMOS software. Results: In a structural relationships among work-family balance, resilience, job satisfaction, parenting self-efficacy and happiness, a total of 13 paths appeared significant. The influence of the husband on the wife was more significant than that of the wife on the husband, and resilience was found to have a strong influence on the happiness of wife and husband. The work-family balance was different for wife and husband. Conclusion: These results suggest that it is necessary to develop various programs and approaches for the development of resilience to promote their happiness. As a policy direction in the future, with a goal of a shift to the paradigm, 'raising children together,' an institutional support should be prepared for the concretization of the formation and practice of the value of co-parenting children.

Acceptance and Effectiveness of Distance Learning in Public Education in Saudi Arabia During Covid19 Pandemic: Perspectives from Students, Teachers and Parents

  • Alkinani, Edrees A.
    • International Journal of Computer Science & Network Security
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    • 제21권2호
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    • pp.54-65
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    • 2021
  • The movement control order and shutting down educational institution in Saudi Arabia has jeopardized the teaching and learning process. Education was shifted to distance learning in order to avoid any academic loss. In the middle of the Covid-19 crisis, there is a need to assess the full image of e-learning in Saudi Arabia. To investigate student and teachers' perception and acceptance, parents' attitudes and believes about distance education are the main goals of the study. The mix-method research design was employed to collect data. Three surveys were distributed to 100 students and 50 teachers and 50 parents from different educational institutions in Saudi Arabia, while semi-structured interviews were conducted with 10 parents. Random stratified and convenient sampling methods were adopted. Both descriptive and content analysis was conducted using SPSS25.0 and NVIVO software for quantitative and qualitative data accordingly. The findings showed that students are comfortable with remote education and are receiving enough support from schools and instructors but they think online education can't replace conventional face-to-face learning. Moreover, the results showed that teachers are having challenges in preparing online classes because of the development of conducting online classes and the lack of training. However, parents showed negative attitudes regarding the benefits and values of remote education and preferred conventional learning styles in elementary schools. Parents tended to reject and resist distance learning for several reasons: professional knowledge and lack of time to support their young kids in online classes, the shortcomings of e-learning, young children's inadequate self-regulation. Saudi parents are neither trained nor ready to use e-learning. The study provided suggestion and implications for teacher education and policymakers.