• 스마트미디어저널
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• 제12권3호
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• pp.60-67
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• 2023

Hyperledger Indy는 탈중앙화 신원 증명 기술인 DID를 구현한 오픈소스다. Hyperledger Indy는 RBFT 합의 알고리즘을 사용하며 풀에 일정 수 이상의 문제 노드로 합의 부족이 발생하면 데이터 추가가 되질 않는다. 이는 노드를 추가하는 것으로 미연에 예방할 수 있으며 자동으로 동작시키기 위해 노드 모니터링 시스템을 구현하였다. 노드 모니터링 시스템은 풀의 상태를 지속해서 확인하며 특정수 이상의 문제 노드가 발생하면 자동으로 노드를 추가해 합의 문제가 발생하는 것을 방지한다. 이는 Hyperledger Indy의 가용성을 높여 줄 수 있으며 합의 알고리즘을 사용하는 다양한 블록체인 서비스에서 참고할 수 있는 연구이다.

• 한국통신학회논문지
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• 제31권6B호
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• pp.527-533
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• 2006

본 논문은 앞으로 산업의 많은 부분에 영향을 미치게 될 ITS(Intelligent Transport System)의 주요 통신 수단인 단거리 전용 통신(DSRC : Dedicated Short Range Communication) 시스템의 성능을 매체 접근 제어(MAC : Media Access Control)단에서의 전송 효율을 분석함으로써 평가하였다. 현재 DSRC는 자동요금징수(ETC : Electric Toll Control)과 버스정보시스템(BIS : Bus Information System) 등의 전송 효율이 시스템이 미치는 영향이 극히 낮은 시스템에 사용되고 있으나, 향후 첨단 운전자 정보 안내 시스템(ADIS : Advanced Driver Information Systems) 또는 첨단차량 및 도로 시스템(AVHS : Advanced Vehicle Highway System) 등과 같은 고도화된 시스템으로 진화할 경우 DSRC의 주요한 매체인 적외선(IR : Infra Red) 방식과 주파수(RF : Radio Frequency) 방식의 MAC 프레임 속성에 따른 서비스의 질은 급격히 변화될 것이다. 따라서 본 논문에서는 그 특성을 전송 속도에 따른 시간의 함수로 구성하여 분석함으로써 이후 다양한 ITS 서비스에 활용할 수 있는 지표를 제공하고자 하였다.

• 한국산업정보학회논문지
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• 제15권2호
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• pp.31-39
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• 2010

VoD(Video-on-Demand) 시스템에서 다루는 데이터는 대용량이면서 실시간에 처리되어야 하는 연속 매체의 특성을 지니고 있다. 대용량의 데이터가 차지하는 저장 공간과 전송 대역폭을 줄이기 위해 사용되는 압축 기법과 데이터의 실시간 처리를 보장하기 위한 자원의 예약 기법은 모두 연속 매체를 처리하는데 있어 필수적이다. VoD 시스템에서는 사용자들에게 영화의 재생뿐만 아니라 고속 전진이나 고속 후진과 같은 대화식 동작도 함께 제공할 수 있어야 하는데 대화식 동작이 야기하는 데이터 요구량의 변화는 디스크 대역폭, 통신망 대역폭, 메모리와 같은 시스템 자원의 관리를 어렵게 한다. VoD 시스템의 경우 기 저장된 비디오 데이터를 처리하기 때문에 데이터 블록에 대한 선반입이 가능하다. 본 논문에서는 가변 비트율의 비디오 데이터를 처리하는 VoD 서버에서 서버의 버퍼를 이용하여 데이터 블록들을 선반입함으로써 대화식 동작을 지원할 수 있는 버퍼 관리 기법을 제안한다. 본 논문에서 제안한 버퍼 관리 기법은 모의실험 결과 수용 사용자 수에서 LRU 기법에 비해 약 34%의 성능 향상을 보였다.

• 한국정보통신학회논문지
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• 제23권9호
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• pp.1096-1103
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• 2019

오늘날 정보통신기술의 발전으로 인해 디지털 영상 매체의 영향력은 점차 커지고 있으며, 청소년들의 대부분이 스마트폰과 컴퓨터를 이용하여 수많은 영상 콘텐츠를 소비하고 있다. 또한 청소년들은 이러한 영상 콘텐츠 소비하는 데에만 그치지 않고 직접 영상을 촬영하고 편집하여 유튜브(YouTube)나 비메오(Vimeo) 등의 매체에 본인이 만든 영상을 업로드하기도 한다. 이러한 현상에서 알 수 있듯이 영상 미디어를 쓰고, 읽고, 표현하는 등의 다양한 환경에서 영상을 활용하고 표현하는 미디어 교육은 매우 중요하다고 할 수 있다. 현재 미디어 교육은 발전된 디지털 기기와 영상 콘텐츠 제작 소프트웨어의 활용에 대한 교육 없이는 논할 수 없게 되었다. 본 연구는 영상 콘텐츠 제작 교육의 관점에서 미디어 교육을 다룬다. 이를 위해 비선형 편집 시스템을 중심으로 한 영상 콘텐츠 제작 과정을 통하여 학습할 수 있는 미디어 교육 방법에 대하여 논의 한다.

• 방송공학회논문지
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• 제27권7호
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• pp.999-1010
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• 2022

The increase in vehicle purchases worldwide is having a very significant impact on the availability of parking spaces. In particular, since it is difficult to secure a parking space in an urban area, it may be of great help to the driver to check vehicle parking information in advance. However, the current parking lot information is still operated semi-manually, such as notifications. Therefore, in this study, we propose a system for detecting a parking space using a relatively simple image processing method based on an image taken from the sky and evaluate its performance. The proposed method first converts the captured RGB image into a black-and-white binary image. This is to simplify the calculation for detection using discrete information. Next, a morphological operation is applied to increase the clarity of the binary image, and a template mask in the form of a bounding box indicating a parking space is applied to check the parking state. Twelve image samples and 2181 total of test, were used for the experiment, and a threshold of 40% was used to detect each parking space. The experimental results showed that information on the availability of parking spaces for parking users was provided with an accuracy of 95%. Although the number of experimental images is somewhat insufficient to address the generality of accuracy, it is possible to confirm the possibility of parking space detection with a simple image processing method.

• Journal of information and communication convergence engineering
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• 제15권4호
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• pp.227-231
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• 2017

Recently, as the number of safety accidents caused by reagents increases, researches on a system that can reduce safety accidents are underway. Existing systems managed reagent cabinet through various sensors. On the other hand, there are disadvantages in that countermeasures against simultaneous danger situations are insufficient at multi-reagents cabinet. In order to solve this problem, this paper proposes a system to manage the reagents cabinet through danger priority. Danger priorities are selected through domestic chemical accident cases and the Chemical Safety Management Act. If a danger situation occurs in the reagent cabinet, make sure it is from a single or multiple reagent cabinets. For multiple reagent cabinets, compare the reagent cabinet priorities and run the device sequentially from the reagent cabinet with the highest priority. Thus, by operating the device according to the danger priority, the chain reaction can be prevented in advance and the reagent cabinet can be safely managed.

• 한국환경복원기술학회지
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• 제23권2호
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• pp.17-31
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• 2020

In the field of environmental landscape architecture, the internet medium is used as an effective communication tool not only in the private level but also in the policy level. Recently, the active utilization of mobile web service is emphasized as the time changes, but there is not much improvement or advance in services due to lack of relevant studies. Therefore, this study is intended to provide basic data needed for improvement and advance by researching the quality of mobile web service among multichannel services provided in environmental landscape architecture related internet media. The model for measuring service quality is SERVQUAL, which was verified in the study of Choi(2015), Choi and Koo(2016), and the final valid samples are total 230. First, the subjects were analyzed as the representative media that are possible to acquire comprehensive knowledge related to environmental landscape architecture. Second, the highest importance level in each subsection was 'protection and security maintenance of customer information' followed by 'Reliability about accurate information supply'. Regarding performance level, 'Reliability about accurate information supply' and 'professional knowledge to communicate with users' are highly evaluated. Third, regarding Importance-Performance Analysis(IPA), the first priority management should is 'Tangibles', and the next are 'Responsibility' and 'Empathy'. The ones for maintenance of the status quo are 'Reliability' and 'Assurance', and there is none for effort reduction. Meanwhile, regarding the importance of each factor and difference in the quality of PC web service and mobile web service studied before, the biggest difference is in 'Tangibles', followed by 'Assurance', 'Empathy', 'Responsibility' and 'Reliability'. It is suggested that the revitalization of Landscape information science(LB1106) presented in the National Science&Technology Standard Classification System is needed. In the future, it is necessary to research the change trend on users' response through continuous evaluation of improved mobile web service.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.275-278
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• 2013

Log는 시스템을 사용하는 모든 자료에 남는 시스템 파일이다. 지금 IT에 이슈화 되고 있는 농협사태, Nate On 정보 유출, 언론기관 서버마비 등 해킹에 의한 범죄가 많이 일어나고 있다. 이에 로그를 전문적으로 분석하는 소프트웨어를 통해 일어나고 있는 해킹 사태에 대해 전문분석이 필요하다. 본 연구는 지능적으로 일어나는 APT 공격에 대해 로그분석으로 패턴을 분석해 이상 Log 발생 시 역추적 하여 사전에 예방하는 기술에 대해 기술한다.

• 스마트미디어저널
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• 제5권2호
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• pp.42-50
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• 2016

In case of a emergency situation or a natural disaster, a warning notification system is an essential tool to notify at-risk people in advance and provide them useful information to survive the event. Although some systems have been proposed such as emergency alert system using android, SMS, or P2P overlay network, these works mainly focus on a reliable message distribution methods. In this paper, we proposed a novel design and implementation of a personalized warning notification system to help inform not only the at-risk people but also their family and friends about the coming disaster as well as escape plan and survival information. The system consists of three main modules: the user selection module, the knowledge based message generator, and message distribution modules. The user selection module collects the list of people involved in the event and sorts them based on their level of involvement (their location, working position and social relationships). The knowledge based message generator provides each person with a personalized message that is concise and contains only the necessary information for the particular person based on their working position and their involvement in the event. The message distribution module will then find a best path for sending the personalized messages based on trustiness of locations since network failures may exist in a disaster event. Additionally, the system also have a comprehensive database and an interactive web interface for both user and system administrator. For evaluation, the system was implemented and demonstrated successfully with a building on fire scenario.

• 한국도서관정보학회지
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• 제8권
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• pp.155-184
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• 1981

The publication of the result of scholarly research is an integral part of the process by which learning is advanced. The university presses, as one of the major scholarly publishers are now confronted with many critical problems, such as the declining unit sales, the explosion of manuscripts, the challenge of new publishing technologies, etc., in performing the role of the scholarly communication system. The purpose of this study is to identify the problems imposed on the university presses and alternative strategies for them. For the study, the related literature to the subject were read, analyzed and synthesized, from which the overall prospect of the problems and alternative strategies are derived. The conclusion of the study can be summarized as follows: (1) The faith of the university should lie in its role to advance scholarly learning through production and dissemination of high-quality knowledge, and the university press should materialize such a faith. (2) The scholarly books, though not the best media of scholarly communication taking a side view of its timeliness and brevity, can perform the function of the best media for the specific subject and readers. (3) The scholarly books as national resource must be published for the scholars demanding them even though the publication can't help depending on the subsidiary fund. (4) For the survival and activation of the university presses, the following strategies should be examined, and put in force if necessary. (a) The role of the foundation su n.0, pporting the university presses should be expanded (b) The Co-operative system among the operations of the presses should be established. (c) It is desirable that the university without the press should participate in the university with the press for both the financial su n.0, pporting and the publicizing its faculty's manuscripts. (d) The positive efforts should be made for the increase of sales copies by implementing the dual-system of publication. (e) It is desirable that 'recording system' should be incorporated in the traditional publication system both for the lightening of financial problems and the explosion of publications. (f) It is necessary that the effective methods of the bibliographical control should be developed for the improvement of the scholarly communication. (g) Any kind of the permanent organization composed of the representatives from all the infrastructures of information industry should be established to study the character and direction of technological changes and to discern the better choice of specific, technologies in the scholarly communication system.