• 한국정보통신학회논문지
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• 제21권10호
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• pp.1833-1839
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• 2017

2014년 12월 미래부(현 과학기술정보통신부)의 통합공공망주파수 할당을 시작으로 철도통합무선망(LTE-R)의 성능개선을 추진하고 있다. LTE-R은 기존 기술방식 대비 기술적 성숙도 및 성능측면, 표준화 기반에서의 진화의 용이성 등 많은 장점이 있으나, 국내 전파정책으로 통합공공망 사용기관(행정안전부 PS-LTE 및 해수부의 LTE-M)간 주파수 간섭과 2017년 상용화를 시작한 UHD TV와의 간섭 등 향후 전국철도망의 안정적 열차무선서비스 운용환경 마련을 위해서는 해결할 과제 또한 잔재되어 있다. 본 논문에서는 원주~강릉구간 철도통합무선망(LTE-R)을 추진함에 있어 시험선 구축을 통해 도출된 간섭요인에 따른 LTE-R 성능변화 및 간섭 해소를 위한 RAN-Sharing 구현 결과, 그리고 도출된 시험결과를 토대로 설계단계에서 계획된 링크버짓 변경사항 등을 분석하여 통합공공망 주파수 공용환경에서의 향후 LTE-R 기지국 설계 추가될 기준 방안을 제시하고자 한다.

• Journal of Information Technology Applications and Management
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• 제15권4호
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• pp.61-76
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• 2008

As XBRL applications for sharing the contents and semantics of business reports get activated, it is increasingly necessary to reuse components systematically by the standardization in the national level. The current standardization of Korean electronic documents follows the "Guideline for XML Documents Development", which aims to maximize the reusability of components by providing a business library as well as the UN/CEFACT core components methodology. XBRL takes the same approach with the standardization of electronic documents in that their components (concepts and their structures) are defined using XSD. In XBRL, however, concept are restricted to specific types and diverse relationship types can be defined for associating the concepts to themselves and other additional information. As a result, there are some issues that may not be solved by just applying the guideline to XBRL. This paper presents a basic method for applying the methodology to XBRL applications in order to realize the systematic reusing and standardization of XBRL documents in the national level. For case analysis, FSS (Financial Supervisory Service) income statement is employed to demonstrate the possibility of the method.

• 한국IT서비스학회지
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• 제7권1호
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• pp.237-254
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• 2008

Government itself produces a vast amount of highly valuable information, and the internet increases its potential social and economic value. So far, government provide web services that is web 1.0 style. To meet the user's needs, that is online collaboration and sharing, government web services also change to web 2.0. This paper argues that government could now grasp the opportunities that are emerging in terms of web 2.0. Current policy and action is not yet adequate to grasp these opportunities. So, this study focused on the strategic development of electronic government services based on web 2.0. For the purpose, we reviewed the web 2.0 cases and former electronic government services. And then, we defined government 2.0 that is electronic government services based on web 2.0, and provided reference model of government 2.0. Government 2.0 reference model will help the administrators to find better ways to use the technological infrastructure and save efforts for trial and errors from the lack of systematic approach.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.353-356
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• 2002

In this paper, we design an efficient, scalable one-dimensional discrete wavelet transform (1DDWT) filter using data reorder unit (DRU). At each level, the required hardware is optimized by sharing multipliers and adders because the input rate is reduced by a factor of two at each level due to decimation. The proposed architecture shows 100% hardware utilization by balancing hardware with input rate. Furthermore, sharing the coefficients of the highpass and the lowpass filters using the mirror filter property reduces the number of multipliers and adders by half. We designed a scalable DRU that efficiently reorders and feeds inputs to highpass and lowpass filters. The proposed DRU-based architecture is so regular and scalable that it can be easily extended to an arbitrary 1D DWT structure with M taps and J levels. Compared to other architectures, the proposed DWT filter shows efficiency in performance with relatively less hardware.

• 한국멀티미디어학회논문지
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• 제8권12호
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• pp.1638-1648
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• 2005

The SEM approach to PKl offers several advantages, such as immediate revocation of users' signing ability without CRLs and compatibility with the standard RSA. However, it has a weakness against denial of service attack caused by breaking down or being compromised. G. Vanrenen et al. proposed a distributed SEM approach to overcome the weaknesses. However, it does not provide the desirable properties such as instant availability and immunity against denial of service attack, due to inadequate usage of threshold cryptography and proactive secret sharing. In this paper, we point out its structural contradictions and propose a modified version of distributed SEM approach.

• 디지털융복합연구
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• 제6권4호
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• pp.83-90
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• 2008

When small organizations construct and operate Knowledge Management System(KMS), there exists inefficiency in employee participation and system usage. In recent years, web itself is evolving into web 2.0. And It is crucial to utilize web 2.0 characteristics into KMS. The problems in the original version of KMS(KMS 1.0) is as follows. KMS is separated from Offline and electronic work processing systems. Even information in the electronic work processing system cannot be accessed by employees of other divisions in the same organization. Now web 2.0 environment provides more enhanced user participation and information sharing. It also reinforces KMS 1.0 into KMS 2.0. Small organizations should take advantage of web 2.0 environment and construct the better version KMS of its own with low-cost and high-efficiency.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (A)
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• pp.338-340
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• 2003

Certified E-mail 프로토콜은 공정한 교환(fair exchange)을 보장하기 위하여 신뢰된 제 3자 (Trusted Third Party, TTP)톨 사용한다. 그러므로, Certified E-mail을 사용하는 유저들은 원격지의 TTP를 완전히 신뢰(fully-trust)해야 한다. 만약 TTP가 훼손되거나 유저와 공모하여 악위적인 행동을 한다면 Certified E-mail 프로토콜의 공정성(fairness)은 붕괴된다. 본 논문에서는 Threshold secret sharing을 사용하여 TTP의 신뢰성을 분산시킨 강건한 Certified E-mail 프로토콜을 제안한다. 분산된 TTP(Distributed TTP, DTTP)를 사용하므로써 유저가 공모하는 악위적인(malicious) TTP에 대한 공격을 막을 수 있으며 어느 한 DTTP가 훼손되더라도 전체 프로토콜에 영향을 주지 못한다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.126-129
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• 2003

The robot has recently emerged as a factor in the daily lives of humans, taking the form of a mechanical pet or similar source of entertainment. A robot system that is designed to co-exist with humans, i.e., a coexistence-type robot system, is important to be "it exists in various environments with the person, and robot system by which the interaction of n physical, informational emotion with the person etc. was valued". When studying the impact of intimacy in the human/robot relationship, we have to examine the problems that can arise as a result of physical intimacy(coordination on safety in the hardware side and a soft side). Furthermore, We should also consider the informational aspects of intimacy (recognition technology, and information transport and sharing).

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.130-133
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• 2003

The robot has recently emerged as a factor in the daily lives of humans, taking the form of a mechanical pet or similar source of entertainment. A robot system that is designed to co-exist with humans, i.e., a coexistence-type robot system, is important to be "it exists in various environments with the person, and robot system by which the interaction of a physical, informational emotion with the person etc. was valued". When studying the impact of intimacy in the human/robot relationship, we have to examine the problems that can arise as a result of physical intimacy(coordination on safety in the hardware side and a soft side). Furthermore, We should also consider the informational aspects of intimacy (recognition technology, and information transport and sharing). This paper reports the interim results of the research of a system configuration that enhances the physical intimacy relationship in the symbiosis of the human and the robot.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.595-596
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• 2008

we present a technique of power estimation for LCD panels using regression model. We extract and model two different power sources in LCD panels, those are gray-scale power and additional power of parasitic capacitors for charge sharing effect with inversion scheme. To model the power source, we use curve fitting and approximation. The results of proposed technique show that an average accuracy of estimation is above 98%.