• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1568-1571
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• 2011

본 논문에서는 구현한 것은 워드프로세서 자격검정 모의고사를 유선 인터넷을 통하여 테스트 해볼 수 있는 프로그램이다. 워드프로세서 시험 등급은 1급으로 구성되어 있으며, 유선으로 이용 가능한 서비스를 좀 더 확대하여 모바일 기기로도 접속하여 응시내역을 확인할 수 있도록 제작되었다. 또한 모의고사 응시 후 과목별 오답노트를 제공하여, 틀린 문제를 모의고사 후에 재복습도 가능하도록 설계 및 구현하였고, 다른 응시생과 시험 결과를 비교할 수 있도록 하여 자신의 현재 성적 중에서 부족한 부분을 확인한 후 추가 학습을 통해 채울 수 있도록 하였다. 모바일 기기를 통해 유선 인터넷에서 응시한 모의고사의 응시내역을 확인할 수 있도록 구현한 것은 시간 및 공간의 제약없이 확인하는 방법을 제공하기 위함이다.

• The KIPS Transactions:PartC
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• v.18C no.2
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• pp.103-110
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• 2011

Although a mobile Internet telephony service becomes popular with the rapid propagation of smart phones, its service quality management system has not been prepared enough yet. For successful settlement and deployment of the mobile Internet telephony service in future, a strict service quality management is required. The service quality management using a specific measurement equipment has limitations that real-time monitoring is impossible. In this paper, therefore, we propose a proactive service quality management system for the mobile Internet telephony service and develop a software for its implementation. The developed software is verified by comparing the measurement results from the developed software to those from the softwares commonly used, and it is proved that the developed software is quite reliable.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.125-130
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• 2015

In this paper, a command and control (C2) system development using a network emulator is treated. Due to the development of information and communication technologies enabling reinforcement of information exchange and computational capability, an operational concept network centric warfare (NCW) was introduced. In here, it summarizes a developmental test environment build based on dummynet, one of the software based network emulator, and an operational concept of target command and control system. Moreover, I explain command and control system developmental test cases and results, and suggest an operational concept to overcome limitations of target communication system. I expect this concept will reduce data traffic of proposed C2 system especially plot messages which is distributed same data with short interval.

• The Transactions of the Korea Information Processing Society
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• v.6 no.9
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• pp.2320-2331
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• 1999

Over the Internet, in order to utilize a collection of idle computers as a parallel computing platform, we propose a new scheme called GICE(Global Internet Computing Environment). GICE is motivated to obtain high programmability, efficient support for heterogeneous computing resources, system scalability, and finally high performance. The programming model of GICE is based on a single address space. GICE is featured with a Java based programming environment, a dynamic resource management scheme, and efficient parallel task scheduling and execution mechanisms. Based on a prototype implementation of GICE, we address the concept, feasibility, complexity and performance of Internet computing.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.313-316
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• 2016

현행 수화방송서비스는 방송영상 화면위에 수화영상을 덧씌우는 방식으로 송출하기 때문에 수화영상의 크기가 작고 수화 영상을 제거하거나 크기 위치 조정이 불가능하여 청각장애인의 TV 시청에 불편함을 초래하고 있다. 청각장애인의 방송접근권 확대와 일반시청자의 TV 시청환경 제고를 위해 스마트 수화방송서비스는 방송 인터넷 융합 하이브리드 방식으로 방송영상과 수화영상을 방송망과 인터넷망으로 각각 송출하고 TV수신기가 두 영상의 동기화를 처리하고 앱을 통해 수화영상의 크기, 위치 조정 및 제거 서비스를 제공한다. 본 논문에서는 방송 인터넷 융합 하이브리드 방식인 스마트 수화방송서비스의 표준 기술 및 동기화 방식을 소개하고 스마트 수화방송 시험환경 및 동기화 지연시간 측정 결과를 소개한다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.267-268
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• 2011

인터넷데이터센터는 현대 IT산업의 중심설비로서 수십 MW의 전력을 소비하는 집중부하형태를 취하고 있다. 인터넷데이터센터의 특성상 전원의 신뢰성을 높이기 위하여 무정전전원장치(UPS)를 사용하는 것이 필수사항이다. 따라서 기존의 교류방식은 (교류-직류), (직류-교류), (교류-직류)의 3단계 전력변환이 필요하여 전체 급전계통의 효율저하를 가져온다. 이에 비하여 직류급전방식은 기존 계통 망에 연결하기 위한 (교류-직류) 1단계의 전력변환만 필요하므로 효율을 크게 개선할 수 있을 뿐만 아니라 전원의 신뢰도를 높일 수 있다고 알려져 있다. 본 논문에서는 인터넷데이터센터 내에 220V교류방식과 300V직류방식의 시험용 급전계통을 구축하고 똑같은 부하운전 조건에서 실제의 급전효율을 측정하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.271-273
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• 2003

차세대 인터넷의 기반이 되고 있는 IPv6가 소개된 이후 IPv4 인터넷 세계에서 IPv6 네트워킹이 가능하게 되었다. 현재 IPv6 도입을 위한 시험망이 세계 각국에서 구축되고 있으며, 이러한 IPv6망을 인터넷 망에 연결하기 위한 IPv6로의 전이에 대한 연구가 활발하게 추진되고 있다. 성공적으로 IPv6 로 전환하기 위해 무엇보다 필요한 것이 기존에 동작되고 있는 IPv4 에서 IPv6 로의 자연스러운 이전을 지원해 주는 IPv6 전환 메커니즘이다. 본 논문에서는 이러한 IPv6 로의 전이 단계에서의 전환기법들 중 NAT­PT를 기반으로 한 양 방향 프로토콜 전환기법의 연구 및 실제 구축을 통한 NAT­PT의 기능에 대한 연구를 수행하였다.

• Journal of The Korean Association For Science Education
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• v.30 no.4
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• pp.429-436
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• 2010

In this study, the difficulties experienced by secondary preservice science teachers in studying the theory of science education for teacher selection test were studied. At first, questions of the internet cafe for preparing the teacher selection test from January 2008 to June 2009 were analyzed in terms of content area. A survey was also administered to 39 preservice science teachers who took the teacher selection test. The rubric used in this study was developed by the Korea Institute for Curriculum and Evaluation and the Korean Association for Science Education. As a result, the most frequent question areas were 'philosophy and history of science' and 'theories and models of teaching and learning science'. In the survey with the preservice science teachers, the most difficult content area was the philosophy of science. The application of teaching and learning model was also one of the most difficult areas. Based on these results, educational implications were discussed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.2
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• pp.117-122
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• 2020

In this paper, we study the electromagnetic interference in adjacent antenna aperture of multi-function radar for Integrated MAST of naval ship, which is operating plural radars, with test result of two different X-band antennas. Two antennas is placed in the test fixture copying the part of Integrated MAST for the experiment. The test figure is modeled to see the electromagnetic interference when antenna beam is steered by using electromagnetic analysis tool. Also, 6 test scenarios is determined to verify experimentally and each test scenario is run in an anechoic chamber. At the test antenna #1 radiates a pulse signal and the signal from the antenna #2 is stored and analyzed in the optic data format through a receiving device. Based on the result, the effect of electromagnetic interference is suggested when multi-function radars in the Integrated MAST are operating in adjacent distance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.6
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• pp.97-102
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• 2023

This study is to provide improvement of tester for IoT system, which has recently become diversified and large-scale and It is about a method to improve the packet processing performance of the tester and securing flexibility in traffic protocol creation and operation. The purpose of this study is to design a OSS DPDK-based high-speed IoT network performance test system, which pre-verifies and measures the performance of data traffic transmission in an increasingly sophisticated high-capacity IoT network system. The basic structure of the high-speed IoT performance tester was designed using a DPDK-based traffic generator, the expected effect was suggested to traffic modeling and packet generation capability when the system was applied through experiments