• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.8
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• pp.868-876
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• 2016

MUSIC (multiple signal classification) algorithm is a representative algorithm estimating the angle of arrival using the eigenvalues and eigenvectors. Generally, the eigenvalues and eigenvectors are obtained through the eigen-analysis, but this analysis requires high computational complexity and late convergence time. For this reason, it is almost impossible to construct the real-time system with low-cost using this approach. Even though QR iteration is considered as the eigen-analysis approach to improve these problems, this is inappropriate to apply to the MUSIC algorithm. In this paper, we analyze the problems of conventional method based on the eigenvalues for convergence decision and propose the improved decision algorithm using the eigenvectors.

• Journal of Broadcast Engineering
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• v.12 no.4
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• pp.321-332
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• 2007

The digitalization of a broadcast has caused the oversupply of the contents in order to fit the user's needs for various broadcast services. The massive contents could not help demanding one-sided watching without considering a taste and preference of a user. This situation is enlarging the demand about the personalized broadcast service to enable user to watch broadcast contents in anytime according to surplus provision of broadcast contents. TV-Anytime standard could be a solution for broadcast service to enable users to watch personalized broadcast contents according to their preference. The paper proposes the personalized broadcasting system for authoring, receiving and transmission of TV-Anytime metadata, the detailed information about the broadcast contents so that user could efficiently search a large of broadcast contents stored in the PDR(Personal Digital Recorder)receiver under the DCATV(Digital Cable Television) environment.

• Journal of the Korean Institute of Gas
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• v.13 no.4
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• pp.46-52
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• 2009

Hydrogen can extend the lean misfire limit to a large extent when it is mixed with conventional fuels for an internal combustion engine. This study is about fuel reforming to produce hydrogen enriched gas as a fuel for engine. Especially gasoline, which consists of numerous hydrocarbon fuels, considered as source of reformed gas. Various hydrocarbons, including commercial fuel were reformed and potentialities of reformed gas on vehicles were accessed. The reforming efficiency and hydrogen yield were observed. Maximum hydrogen yield were found with different gas hourly space velocity(GHSV) and O2/C ratio of reforming conditions.

• The Journal of Society for e-Business Studies
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• v.11 no.1
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• pp.69-89
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• 2006

Due to the technological developments and industrial changes , studying for the future has been attached great importance. According to the forthcoming ubiquitous computing environment or smart environment, it is necessary for a country and an enterprise to forecast the future or foresight the future technologies . Although many countries have been doing the foresight, it is difficult for the enterprise to try future foresight activity, because the foresight activity needs lots of the costs and time for good results. Also, almost methodologies used in foresight are suitable for country level foresight projects. In this research, a methodology is developed for an enterprise to use easily, and a case based on the proposed methodology is presented. The proposed foresight methodology is developed based on the traditional forecasting methods, FAR, Future Wheel, and Scenario. Especially, the methodology focused on the customers of a company.

• Journal of the Korea Convergence Society
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• v.9 no.7
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• pp.223-230
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• 2018

In the case of a one-shot logistic equipment system that has been stored for a long time, reliability changes with the passage of time. Therefore, when the time comes to use, the storage reliability of the product is an important quality characteristic, and the existing studies have focused on the research for calculating the optimal period inspection cycle to improve the storage reliability. In this study, we analyzed the influence of the two factors on the storage reliability at the convergence point by analyzing the design reliability as well as the periodic inspection cycle. To do this, we applied the existing Martinez storage reliability model to the missile, a representative product of a one-shot system, and analyzed the quantitative effects of the design reliability and the periodic inspection cycle. From the results of the analysis, it was confirmed that the maintenance of the periodic inspection cycle is more important for the improvement of the storage reliability than the design reliability in the design reliability category of the current product.

• Korean Architects
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• s.476
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• pp.71-82
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• 2008

1970년 초에 배럴당 1불하던 원유가가 지금은 120불을 상회하고 있다. 더욱 놀라운 것은 3년 전만 하더라도 40불 이하 수준이던 것이 불과 몇 년 사이에 3배 이상 급등해 버린 것이다. 우리는 아직 유가 100불 이상의 고유가 시대에 대한 고통을 실감하지 못하고 있지만, 빠른 시일 안에 대항한 형태로 우리를 불편하게 하고, 더가서는 사회 경제 문화 등 모든 우리의 활동패턴에 근본적 변화를 일으킬 것이라는데는 어느 누구도 이의를 달지 못할 것이다. 한편 90년대만 하더라도 친환경 건축기술은 선택적 사양으로 인식되어 왔으며, 일부 고급건물 또는 데모성격의 건물에만 반영되던 미래의 기술 분야로 간주되어왔다. 하지만 10년 남짓 지난 지금 우리 주변에서 가장 흔하게 접할 수 있는 용어 중의 하나가 친환경, 지속가능, 그린, 에코 등 이며, 최근 많은 건설사가 고민하고 있는 가장 중요한 이슈가 친환경 건축 관련 기술이 되어버렸다. 최근 유가의 급등세 보다는 더디다 할 지라도 몇 년 사이에 벌어지고 있는 제도적, 사회 경제적 변화 동향을 돌이켜 볼 때 건축계 또한 매우 빠른 속도로 변해가고 있으며, 부지불시간에 유가등급과 같이 변화된 환경에 놀라는 시기가 곧 도래할 것이다. 오랜 기간 에너지 및 친환경 관련 요소기술의 개발, 정부의 지원제도 확대, 보급 강화 등 각종 노력을 통해 이제는 건축 설계분야에서도 친환경건축물에 대한 저변이 크게 확대되었다고 볼 수 있다. 하지만 실상 우리주변에서 제대로된 친환경 건축물을 실제로 보고자 한다면 두손으로 꼽기도 힘들 정도인 사실에 놀라게 될 것이다. 이러한 배경하에 이번 연재에서는 그동안 오랜기간 떠들고 노력했음에도 불구하고 실제 제대로된 친환경 건축물을 우리 주변에서 찾기 힘든 이유를 건축실무자 측면에서 재고해 보고, 이에 대한 새로운 해결방안을 모색해 보는 계기를 갖고자 한다. 특히 많은 친환경 건축기술 중 최근 선진국을 중심으로 가장 큰 이슈가 되어 있고, 또한 건축사 입장에서 쉽게 접근하기 어려운 기술분야인 신재생에너지 건축응용 측면에서 다양한 최신 기술 및 실질적 접근방법과 사례를 주제별로 제시하고자 한다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2017.05a
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• pp.135-135
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• 2017

제염기술은 원자력발전소의 순환계통장치 및 기기류의 방사성 오염물질을 제거하는 기술이다. 현재 국내 원전의 설계 수명 및 유지보수 시기가 도래함에 따라, 작업 전 작업자의 방사선 피사량을 극소화하기 위한 제염 기술이 주목을 받고 있다. 제염 방법에는 크게 기계적 제염과 화학약품을 사용하는 화학제염이 있다. 그 중 화학제염은 복잡한 구조의 제염 대상물에 대한 큰 효과 및 간단한 공정 때문에 주로 사용되고 있다. 제염 시 방사성 산화물과 오염성분을 제거하기 위해 강산 또는 강알칼리의 화학용액이 사용된다. 강한 화학약품을 사용함으로써 큰 제염효과를 얻을 수 있는 반면, 금속 재료의 부식에 대한 구동력도 커지게 된다. 금속 재료의 경우, 강한 부식성 환경에서 공식(pitting corrosion) 및 입계부식(intergranular corrosion)형태의 손상이 크게 발생하기 때문에, 제염공정 시 사용되는 화학용액에 대한 재료의 건전성 검증이 반드시 필요하다. 본 연구에서는 원전기기용 재료인 니켈합금강 Inconel600의 화학제염 시 시험공정 3가지에 대한 부식손상 특성을 규명하였다. 산화공정은 $HMnO_4$ 실험용액을 공통으로 사용하였으며, 산화공정 종료 후 환원공정은 각 시험공정에 따라 환원공정 1은 2000ppm $H_2C_2O_4$, 환원공정 2는 1500ppm $H_2C_2O_4$ + 500ppm $H_8C_6O_7$, 그리고 환원공정 3은 3000ppm $H_2C_2O_4$ 실험용액을 각각 투입하여 수행하였다. 산화, 환원공정을 1Cycle로 하여 온도 $75^{\circ}C$로 유지된 용액에 각 2시간씩 침적하였다. 각 시험공정 별로 총 5Cycle을 실시하였다. 각 시험공정 Cycle종료 후 시험편을 취외하여 무게감량측정, SEM(Scanning electron microscope)분석, 3D현미경분석 그리고 타펠분극 실험을 실시하였다. 각 분석결과를 토대로 하여, 니켈합금 Inconel600에 대한 화학제염 시 시험공정에 따른 부식특성을 규명하였다.

• Journal of Digital Convergence
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• v.14 no.2
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• pp.65-72
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• 2016

This study built the theoretical frameworks for empirical analysis based on the analysis of the relationship among the concepts of risk of information privacy, the experience of information privacy, the policy of information privacy and information control via the provision intention studies. Also, in order to analyze the relationship among the factors such as the risk of information privacy, intention to offer the personal information, this study investigated the concepts of information privacy and studies related with the privacy, established a research model about the information privacy. Followings are the results of this study: First, the information privacy risk, information privacy experience, information privacy policy, and information control have positive effects upon the information privacy concern. Second, the information privacy concern has the negative effects upon the provision intention of personal information.

• Journal of Digital Convergence
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• v.9 no.5
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• pp.99-111
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• 2011

Nowadays, the rapid progress and worldwide use of smart-media(SNS) has resulted in coming of the smart media convergence age. In practice, however, the effectiveness of smart media convergence society is limited by the difficulties of using it, which include accessibility, waiting for loading, clutter, old information, privacy risks, expensive communication, etc. The conquest of these difficulties must be policy target of broadcasting and telecommunication for high quality of communication life. From this perspective, this paper proposes a new policy of broadcasting and telecommunication based on the dynamic quality of life for the smart media convergence society. This smart convergence policy will not promote only the development and production of smart media contents but also its stable supply and it will secure the accessibility and privacy. In conclusion, this paper reveals that the components of quality of life are important elements of broadcasting and communication policies which will eventually lead to the popular use of smart media and enhance its quality.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.23 no.3
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• pp.57-84
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• 2012

With the advent of Big data era unleashed by tremendous increase of structured and unstructured data, a library needs an effective method to store, manage and preserve various information resources. Also, needs of collaboration of libraries are continuously increased in digital environment. As an effective method to handle the changes and challenges in libraries, interest on cloud computing is growing more and more. This study aims to propose a method to introduce cloud computing in libraries. To achieve the goals, this study performed the literature review to analyze problems of existing library systems. Also, this study proposed considerations, expectations, service scenario, phased strategy to introduce cloud computing in libraries. Based on the results extracted from cases that libraries have introduced cloud computing-based systems, this study proposed introduction strategy and specific applying areas in library works as considered features of cloud computing models. The proposed phased strategy and service scenario may reduce time and effort in the process of introduction of cloud computing and maximize the effect of cloud computing.