• Journal of Korea Multimedia Society
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• 제8권1호
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• pp.79-87
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• 2005

In e-commerce applications, a public key cryptosystem is an important and indispensible element for the basic security operations such as authentication, digital signaturing, and key distribution. In wired network environments, the public key infrastructure certificate, which is based on X.509 specification, has been widely used. On the other hand, it still remains difficult to use the certificate information in wireless network environments due to the inherent limitations of the hand-held devices such as low computational power and short battery life. In this paper, we facilitate a codesign approach by implementing a software public-key cryptosystem and classifying its internal computation overheads quantitatively using a software profiling technique. Moreover, we propose a method to analyze the profiled data and apply it to the problem of software/hardware partitioning in a codesign approach. As an illustrative example, we analyze the computational overheads of an EC-Elfagamal application and examine a critical computational path.

• Proceedings of the Korean Society of Computer Information Conference
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• 한국컴퓨터정보학회 2011년도 제43차 동계학술발표논문집 19권1호
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• pp.125-126
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• 2011

소셜 네트워크 서비스(SNS: Social Network Service)는 사용자들 간의 정보공유 및 관계형성을 위한 Web 2.0 기반 기술로써, 관계를 통해 형성된 사용자들 간의 상호작용을 지원하는 서비스이다. SNS 기술은 개인들 간의 관계 뿐 아니라 공공부문의 서비스의 제공자인 정부부처 및 공공서비스 제공기관들과 사회구성원들 간의 관계형성을 위한 기술로써 각광받고 있다. 최근에는 모바일 기술의 발전에 힘입어 트위터, 페이스북과 같은 SNS 이용자가 빠르게 증가하고 있으며 그 활용범위 또한 개인 사용자들 간의 정보공유에서 기업과 고객, 공공과 국민의 관계까지 확장하고 있다. 본 논문에서는 SNS가 공공부문의 서비스 제공을 위한 수단으로 활용한 사례를 통해 요구되는 기술을 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 한국방송공학회 1996년도 Proceedings International Workshop on New Video Media Technology
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• pp.67-71
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• 1996

We have developed an MPEG2 realtime codec system and ATM interface, and evaluated the performance and characteristics of the audio-visual communication in terms of Interoperability specification of The ATM Forum, ITU-T H.310 draft recommendation [1] and the reference points of DAVIC specification through the experiments using the experimental public ATM network.

• The Transactions of the Korea Information Processing Society
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• 제6권3호
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• pp.729-741
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• 1999

ATM networks are widely deployed as the network that is capable of supporting multimedia services efficiently now. To date, a large portion of ATM connections, particularly in the WAN environment, have been of a permanent virtual circuits-requiring management intervention for set-up and tear-down. However, switched virtual circuits are required to support a range of desired characteristics on demand, to a reachable end user. To establish, maintain and release on-demand call/connections, the user-network interface(UNI) and node-node interface(NNI) signalling capabilities are required. Two protocols have been specified for NNI signalling within a public network: the broadband integrated-services user part(B-ISUP) protocol specified by the ITU-T, and the private network-network interface(PNNI) protocol specified by the ATM Forum. PNNI offers different type of internetwork or internodal interface from the traditional B-ISUP approach favored to date public network operators. In spite of its name, PNNI may find its place in network service provide networks as well as in private networks. Thus many public network operators and ATM equipment manufacturers are still unable to choose the NNI interface architecture of their system. In this paper, we survey the characteristics of the B-ISUP and PNNI protocols, and investigate the applicability issue of these specifications to the ATM-based Information Infra-Network of Korea. Analyzing the characteristics of the two protocols and clarifying the NNi requirements of the ATM-based Information Infra-Network of Korea, we propose that the B-ISUP protocol is more suitable than PNNI.

• Journal of the Korea Society of Computer and Information
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• 제21권10호
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• pp.77-83
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• 2016

To verify the trustworthiness of messages, public key certificates and certificate revocation list(CRL) has been standardized for vehicular networks. However, timely distribution of large CRLs to vehicles should be more elaborated with low bandwidth utilization from a practical point of view. To address this concern, we propose a CRL distribution scheme using long term evolution(LTE) point-to-multicast transmission, namely the enhanced multimedia broadcast multicast service(eMBMS). The schem is much more resource efficient than the existing unicast CRL distribution schemes for vehicular networks and it allows realizing the regional CRL distribution schemes efficiently in LTE network. By means of ns-3 simulation, we analyze the performance, latency, and execution time of the scheme in terms of varying coverage of the multimedia broadcast multicast service over single frequency network (MBFSN).

• Journal of Korea Multimedia Society
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• 제20권8호
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• pp.1291-1298
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• 2017

Optical coherence tomography (OCT) is the most common medical imaging device with the ability to image the retina in eyes at micrometer resolution and to visualize the pathological indicators of many retinal diseases such as Age-Related Macular Degeneration (AMD) and diabetic retinopathy. Accordingly, there have been research activities to analyze and process OCT images to identify those indicators and make medical decisions based on the findings. In this paper, we use a deep convolutional neural network for analysis of OCT volume data to distinguish AMD from normal patients. We propose a novel approach where images in each OCT volume are grouped together into sub-volumes and the network is trained by those sub-volumes instead of individual images. We conducted an experiment using public data set to evaluate the performance of the proposed approach. The experiment confirmed performance improvement of our approach over the traditional image-by-image training approach.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제9권5호
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• pp.1012-1018
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• 2005

According as computer industry develops and the Internet is spread information interchange between remote users video conference system that can exchange multimedia data such as voice as well as simplicity text data or burn by real-time appeared and is used in various field. However, most systems developed present have controversial points of that need expensive multi-point connection equipment or network resource of High band width. Hereupon, in this paper, designed and embody video conference system that can be stable and supplies multimedia information and screen public ownership environment of high-quality as software using minimum network resource without using expensive connection equipment.

• Journal of Korea Multimedia Society
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• 제25권10호
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• pp.1483-1498
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• 2022

While public interests in the metaverse are growing recently in the Korean media and research, its understanding has not been fully established yet. In this study, we aimed to probe whether the rapid growth in media attention about the metaverse has increased its usage as a buzzword accompanied by an absence of scientific context. We analyzed publications and online news containing "metaverse" from 2020 to 2022. The data analysis methods are 1) time series frequency, 2) keyword network, 3) natural language model. The findings indicate the perception gap about metaverse between research and news articles broadened as its popularity has grown. Research about metaverse gradually expanded its connections with related topics-virtual and augmented realities-focusing on social changes in a remote environment. However, media reporting frequently used "metaverse" as a buzzword rather than explaining its scientific background, stimulating the proliferation of related topics and the dispersion of news content. This study further discusses the need for a media strategy to improve public conception of the long-term development of the metaverse.

• Journal of Industrial Technology
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• 제24권B호
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• pp.149-156
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• 2004

Quality services such as the integrated service and the differentiated service have been expected to be supported by public Internet as multimedia applications proliferate. Despite a lot of techniques for quality services have been devised, the prospect for the deployment of these techniques is not clear yet. In this research feasibility of real world quality service is investigated based on former experiments and recent trends in Internet applications. User network-based quality services are considered as the most feasible and economic short-term solution, which are also flexible in nature. Milestones and key technologies for some specific public network-based quality services are also described.

• Proceedings of the IEEK Conference
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.855-858
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• 1998

Nowadays it is possible to make realization of Multimedia service by virtue of developing computer hardware technique and high-bandwidth network. But Multimedia service has some problems. Its file need large storage. Above all, Analog CCTV used in recent has been utilized for various purpose in ban, company and public institution, but this has many defects such as management, low resolution, and etc. To overcome this problems, multimedia component-file-have to be reduced in size. This paper proposes adaptive MPEG-1 video to reduce file size. The method in this paper is realized that according to movement variation, file size is reduced by adaptively making use of MQuant.