• Journal of the Korea Institute of Military Science and Technology
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• v.24 no.5
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• pp.492-502
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• 2021

In electronic warfare, source enumeration and direction-of-arrival estimation are important. The source enumeration method based on eigenvalues of covariance matrix from received is one of the most used methods. However, there are some drawbacks such as accuracy less than 100 % at high SNR, poor performance at low SNR and reduction of maximum number of estimating sources. We suggested new method based on eigenvalues gaps, which is named AREG(Accumulated Ratio of Eigenvalues Gaps). Meanwhile, FGML(Fast Gridless Maximum Likelihood) which reconstructs the covariance matrix was suggested by Wu et al., and it improves performance of the existing source enumeration methods without modification of algorithms. In this paper, first, we combine AREG with FGML to improve the performance. Second, we compare the performance of source enumeration and direction-of-arrival estimation methods in Rayleigh fading. Third, we suggest new method named REG(Ratio of Eigenvalues Gaps) to reduce performance degradation in Rayleigh Fading environment of AREG.

• 한국노년학
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• v.36 no.3
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• pp.847-867
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• 2016

The purpose of this study is to observe whether the specialized quality programs of senior welfare centers actually help service users and meet their needs. In order to find out, we have utilized three different research methods. First, an in-depth interview was generated among the service users of senior welfare centers. Second, the specialized quality program in senior welfare centers was analyzed. Third, a focused group interview among the senior welfare experts was conducted. Based on the results of this study, they suggest four practical proposals. First is to enhancing programs of senior welfare centers based on the service users' rights. Second is to providing high-class services by developing and transforming the 'elderly culture.' Third is to converting the existing programs to make associations with their local communities. Last is to building a network as a hub to communicate and sharing outstanding programs within senior welfare centers.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.32 no.5
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• pp.891-898
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• 2022

Along with global interest, drones are expanding the base of utilization such as transportation of goods, forest protection, and safety management, and cluster flights are being applied in various fields such as military operations and environmental monitoring. Currently, specialized networks such as e-UM 5G for services in specific industries are being established in Korea. In this regard, drone systems are also moving to establish specialized networks to provide services that are fused with AI and autonomous flight. As drones converge with various services, various security threats in various environments are also subordinated, and in response, requirements and guidelines for drone security are being prepared in Korea. In this paper, we propose a technology method for peer identification and safe information provision between cluster flight drones by utilizing a cryptographic module equipped with wireless LAN and quantum entropy-based random number generator in a cluster flight system and a mobile communication network such as e-UM 5G.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.185-188
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• 2011

스마트폰의 대중화로 인해 사용자의 다양한 요구사항이 발생하고 있고, 스마트폰 용 어플리케이션에 대한 개발이 활발히 수행되고 있으나 하드웨어와의 밀접한 관계 및 재사용성의 요구를 반영하고 있지 못하므로 향후 수요를 감안하여 객체지향 개발방법론을 적용한 체계적인 접근이 필요하다. 본 논문에서는 대표적인 스마트폰 플랫폼인 안드로이드와 아이폰 플랫폼의 수명주기, 하드웨어, 어플리케이션 간의 관계를 통해 스마트폰 어플리케이션 개발절차를 도출하도록 시도하였으며, 객체지향 개발방법론 중에서 Reference Model 중심의 안드로이드 플랫폼과 Rich Client를 지원하는 아이폰 플랫폼에 각각 스마트폰 플랫폼에 준한 하드웨어 특성을 고려하여 특화된 CBD(Component Based Development)기반인 마르미-EM방법론과 서비스 기반의 어플리케이션을 지향하고 있는 MVC(Model-View-Control)패턴이 적용된 SaaS(Software-as-a-Service) 개발방법론을 적용하여 어플리케이션 개발 절차를 비교한다. 이를 통하여 개발방법론의 절차상의 차이점, 강점 및 보완 사항을 분석하고 방법론별 특징을 토대로 향후 보완점을 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.298-301
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• 2011

모바일 기기에서 수집된 많은 정보들은 시맨틱한 정보들을 포함하고 있기 때문에 수치 해석에 특화된 클러스터링 등의 데이터마이닝 방법들을 적용하기가 힘들다. 따라서 상대적인 유사도를 계산하는 방법이 많이 이용되지만, 상대적인 유사도 값조차 유클리드 거리로 환산이 불가능한 특징을 가지는 경우가 많다. 본 논문에서는 비유클리드 특징을 가지는 유사도를 TFIDF 와 pseudo-Euclidean embedding을 적용하여 유클리드 공간 상의 거리값으로 변환하는 방법을 제안한다. 제안하는 방법의 가능성을 보이기 위하여 모바일 기기에서 대학생들의 생활 패턴을 반영하는 데이터를 수집하고, 수집된 데이터에 제안하는 방법을 적용한다. 그리고 적용된 결과를 대학생들의 생활 패턴과 비교하여 분석한다. 또한 장소 간의 유사도를 이용하는 애플리케이션의 프로토타입을 개발한다.

• Journal of the Korea Computer Graphics Society
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• v.21 no.4
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• pp.1-10
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• 2015

Recently, calligraphy has become popular because people focused on emotion. The strokes, dots, swoops, cracks and shading are the calligraphy factors for expressing various emotions such as joy, anger, sorrow, and delight. However, the emotion which is expressed by cracks and shading can be destroyed in the digital work when the calligraphy is used for a variety sizes of prints. Professionals work with high-resolution images which are obtained through the scanner, however normal users should work with low-resolution images taken with the smart phone for calligraphy image editing. We propose a raster image scaling method focused on calligraphy that maintains the emotion with cracks and shading, when normal users use the low-resolution calligraphy images in the digital work. The method recolors aliasing boundary of enlarged rasterized image. When recolored by our method, our method decreases aliasing by using the image gradient method, vivify calligraphy images, and maintains the emotion in cracks and shading by using the alpha value.

• Journal of the Society of Disaster Information
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• v.18 no.2
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• pp.364-373
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• 2022

Purpose: The purpose of this paper is to develope smoke detection using AI model for detecting the initial fire in underground utility tunnels using CCTV Method: To improve detection performance of smoke which is high irregular, a deep learning model for fire detection was trained to optimize smoke detection. Also, several approaches such as dataset cleansing and gradient exploding release were applied to enhance model, and compared with results of those. Result: Results show the proposed approaches can improve the model performance, and the final model has good prediction capability according to several indexes such as mAP. However, the final model has low false negative but high false positive capacities. Conclusion: The present model can apply to smoke detection in underground utility tunnel, fixing the defect by linking between the model and the utility tunnel control system.

• Information Systems Review
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• v.8 no.1
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• pp.203-222
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• 2006

The chronic problems of Information System Outsourcing Development Project include frequent changes in the participants and their roles, and the evasion of project participation, which exert unfavorable influence to the outcome of the project. Such problems are due, in large part, to the low level of project participants' satisfaction in the project. However, little is known about the factors that influence project participants' satisfaction in the project development. This research identifies six potential factors such as project commitment, workload, control, communication within the organization, inter-organization communication, and system development methodology based on PMI(Project Management Institute) and empirically examines their efficacy in explaining the level of participants' satisfaction in the IS development projects based on data from 390 participants in 66 projects. The results indicate that the six factors are strong determinants of participants' satisfaction in system development projects. In other words, the level of satisfaction among project participants overall are largely influenced by project commitment and control, communication, project methodology. Especially, the results reveal that the level of satisfaction among participants from the vendor decreased largely by unrealistic project commitment, frequent changes in project planning and unreasonable control rather than by a significant amount of workload. In conclusion, there need to be a rational approach and solution based on the six factors presented in this research in order to increase participation satisfaction level of the project participants and ultimately enhance project outcome.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.209-212
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• 2013

최신 IT정보기술 발전에 따라 일반 사용자 이외에도 신체적 결함을 가지고 있는 모든 사람들에게 의사소통과 정보획득을 하기 위한 중요한 수단이 되었다. 기술개발이 진행됨에 따라 현대사회의 정보화는 산업현장에서부터 가정에 이르기까지 모든 분야에서 컴퓨터와 인터넷을 통해 다양한 정보를 획득할 수 있으며, 이를 통해 삼품과 서비스를 구입 할 수 있을 뿐만 아니라 생활의 여유를 즐길 수 있도록 해주는 등 사람들의 생활에 커다란 변화를 가져왔다. 이와 같이 빠르고 다양해지는 서비스의 다변화 속에서 자신의 신체적 결함을 극복하고 보완하기 위한 서비스 활용을 가능케 해주는 IT 정보통신 기기 및 제품들은 이들에게 필수적인 부분이라 할 수 있다. 특히 장애인들에게 서비스를 제공하는 특히 정보화가 중요하다 할 수 있다. 이에 장애인 복지관에는 정부의 정보화 촉진 계획에 따라 2001년부터 업무표준화를 시작으로 개발된 전산시스템이 사용되고 있다. 그러나 대부분의 시스템이 일반 기업이나 기관에서 사용하는 시스템을 그대로 갖다 사용하는 관계로 장애인복지관에 특화된 서비스를 고려하지 않아 많은 문제점들이 있다. 따라서 본 연구에서는 이러한 문제점들을 분석하고 해결하기 위한 방법으로 장애인복지관에 특화된 시스템을 구현한다.

• Journal of the Korean Society for Library and Information Science
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• v.40 no.2
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• pp.79-101
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• 2006

There are many famous, well-known special collections built with unique and valuable materials in the libraries all around the world. These special collections are very important for the public and especially for the researchers. Digital access and the Web have altered the landscape of special collections and allowed increasing numbers of users to locate and access rare and valuable materials of special collections. This change has also affected libraries with the responsibility of building and managing special collections. The goal of this paper is to provide readers with insight into the culture of the special collection and to suggest good ideas for public libraries to build their special collections by introducing the special collection building cases in USA and Korea through investigating the public library websites.