• Journal of the Korean Institute of Intelligent Systems
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• v.17 no.7
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• pp.887-892
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• 2007

In this paper, we design, implement and apply network physical layer to 100 BaseFx optical cable interface module based on industrial ethernet protocol EtherCAT that has ensure its open standard ethernet compatibility which haying been provided with real time of control in network of intelligent service robot, can process numerous data to sensor and motor control system. Through various tests, we try to propose suitability as internal network of intelligent service robot.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1135-1138
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• 2002

최근 인터넷 관련 기술이 급속하게 발진하고 있다. 과거의 단순한 데이터 서비스에서 음성, 화상 등의 다양한 멀티미디어 서비스를 제공하고 있다. 모든 미디어가 인터넷으로 수렴되는 NGN(Next Generation Network)으로 발진되어 가고 있다. 개방형 네트워크는 다양한 유무선 통합망의 융합화에 따른 통신망간의 간섭이 증가하고 네트워크 접속점 중심의 통신망간 접속구조가 확대되어 지금까지의 시스템 보안 위주의 단순한 보안 기술을 적용하기가 어려웠다. 따라서 네트워크 노드간을 효율적으로 보호하는 네트워크 중심의 보안 기술이 필요한 시점이다. 이에 본 논문은 진화망을 중심으로 하는 통신 산업의 유 무선 데이터 서비스 증가로 원래 데이터 서비스를 위하여 설계된 것에 다양한 데이터 응용 서비스의 하나로 진화 서비스를 수용학 수 있는 새로운 통신 인프라를 구축하여 통합하는 차세대 통신망에 대해서 살펴보고 차세대 통신망(NGN)에서의 보안기술을 연구한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.275-276
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• 2015

네트워크 가상화를 위한 대표적인 개방적 아키텍처로 OpenFow를 들 수 있다. OpenfFow는 가상 네트워크(Software Defined Network) 개념을 실현하기 위한 랜 스위치 제어 프로토콜의 집합체로서 데이터 센터 등 주로 유선랜 환경을 목표로 설계되어 활용되고 있다. 이 논문에서는 OpenFlow를 무선랜의 AP(Access Point)에 적용하여 WiFi 디바이스들로 구성된 가상 무선 네트워크 관리 프레임을 구현한다. 구현된 관리 프레임은 WiFi 디바이스들의 토폴로지와 트래픽 상황을 중앙 관제 센터에서 모니터링할 수 있고, 플로우 경로를 설정함으로써 라우터를 경유하지 않고 AP 수준에서 스위칭(라우팅)이 가능하여 전체적인 트래픽 혼잡을 크게 줄일 수 있다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.2
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• pp.87-96
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• 2001

This paper proposes a new internet Web based concept & design method and implementation of LonWorks network system for remote intelligent control. The Experimental LonWorks network system using i·LON Web server is designed and fabricated. It is also verified that the developed control modules with LonTalk protocol have available inter offerable, reliable performance characteristics from the experimental results, Especially, the results provide a available technical data for remote home, building & plant automation control.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.993-996
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• 2007

LR-WPAN의 대표적인 기술인 ZigBee는 저속 전송속도를 갖는 홈오토메이션 및 데이터 네트워크를 위해 IEEE 802.15.4 표준을 기반으로 상위 프로토콜과 응용을 규격화한 기술이다. 특히 개방된 무선 환경인 ZigBee 네트워크에서는 무엇보다 보안의 중요성이 대두되고 있으며, ZigBee Alliance 규격에도보안 계층이 포함되어 있다. 그러나 암호화에 사용되는 링크키를 생성하기 위해 신뢰성 있는 정보(마스터키)를 평문으로 전송하기 때문에 직접적으로 노출되는 위험성과 방문자 위치 추적 등 디바이스의 이동이 빈번한 환경에서 PAN 코디네이터의 과부하가 발생할 수 있는 등의 여러 가지 문제점이 존재하고 있다. 본 논문에서는 Du 등이 제안한 사전 키 분배 기법을 이용하여 ZigBee 네트워크에서의 효율적인 키 분배 프로토콜을 제안하였다. 제안된 프로토콜은 디바이스에게 임의의 행렬 열과 행 값을 송신하여 링크키를 생성함으로서 이전의 문제점을 해결하고 더욱 빠른 통신이 가능하도록 하였다.

• Journal of Digital Convergence
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• v.14 no.5
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• pp.149-156
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• 2016

In today's rapidly-changing business context with technology convergence among various fields, new technology development and technology commercialization capabilities are very important to the survival and growth of small and medium-sized enterprises (SMEs). This study develops the research model based on the open innovation perspective and empirically tests it by using 2,000 data from SMEs in South Korea. The empirical analysis result reveals that SMEs' external technology collaboration network and external information network diversities have positive effects on their technology commercialization capability, and these effects are fully mediated by their new technology development capability. Based on these results, the study provides meaningful implications especially in terms of SMEs' managers who pursue entrepreneurship.

• Journal of Digital Contents Society
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• v.19 no.4
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• pp.693-700
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• 2018

Virtual router redundancy protocol (VRRP) was designed as a solution to support fast fail-over in case of network failure. There exists virtual router which acts as default gateway in LAN, and the virtual router is dynamically elected between master and backup router. Through this protocol, end-hosts can be provided seamless network service. However, it needs expensive license fees and maintenance costs to adopt current commercial network operating systems. Furthermore, they are commonly enterprise proprietary software and inherently closed source. In order to tackle these problem, Open N2OS which is open source based open network software platform was developed. It has no dependency on hardware equipment, and provides high availability, scalability, various networking functions. In this paper, we handle VRRP operation and mechanism with related command line interface (CLI).

• Journal of Korean Library and Information Science Society
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• v.45 no.1
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• pp.27-49
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• 2014

This study aims to examine the awareness of the school librarians for task process using SNS(social network services). So, we have surveyed some of them and interviewed two focus groups by the sequential mixed method. The result showed the using SNS of them because of only one persons' operating system and role's characteristics. They are mostly satisfied with the using SNS, so we analyzed the causes. First, we extracted the 103's results except 4's from some librarians and examined descriptive statistics, frequency analysis and ANOVA. Second, we interviewed 2 focus groups and transcribed their opinions. We got 37's concepts, 22's sub categories, 13's categories from results of the open coding. Third, we synthesized the results of survey and open coding's and suggested the directions of future research of the field.

• Korean Journal of Social Welfare
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• v.62 no.4
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• pp.223-248
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• 2010

This study is to explore the contents and interaction of residents voluntary network and propose the strategies to promote residents voluntary network. The grounded theory was utilized to attain our object. Total of seven social worker and 17 residents participated in the study. Data were collected through in-depth interviews and documents. The data were analyzed by using Strauss and Corbin's method. Results are the followings. In open coding 13 categories, 32 subcategories and 133 concepts were constructed. In axial coding causal conditions were qualitative ascent of needs, emergence of the right welfare consumer. Phenomenon was agitation of praxis ground and grope of exist. Contextual conditions were crisis resources, skepticism of welfare. Intervention conditions were maturation of welfare cognition and proliferation of the sense of community responsibility. Strategy were resocialization of voluntary organization and construction of field related service delivery system. Consequence were grass routing welfare strategic fitting service system. In selective coding we constructed the core category: The praxis revolution from bottom for break social welfare environment.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.39 no.1
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• pp.14-22
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• 2002

We propose the fuzzy BCMP queueing network model for the performance evaluation of distributed processing system with the ambiguous arrival rates of job, service requirements, and service rates of server by the network environments. This model is classified as the open and closed type whether or not the network accepts jobs from the system outside. We derived the measures for system performances such as the job average spending time, average job number in the system and server utilizations using fuzzy mean value analysis which can process the fuzzy factors for both types. Computer simulation was performed for verifying the effectiveness of derived equations of performance evaluation. The fuzzy BCMP queueing network model was evaluated according to the fuzzy arrival rates of job, the number of clients, and the fuzzy service requirements of job for each the open and closed type. The results were agreed with the predicted performance evaluations of the system.