• International Journal of Internet, Broadcasting and Communication
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• 제9권4호
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• pp.59-66
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• 2017

Cloud computing has evolved into a core computing infrastructure for the internet that encompasses content, as well as communications, applications and commerce. By providing powerful computing and communications capabilities in the palm of the hand everywhere with a variety of smart devices, mobile applications such as virtual reality, sensing and navigation have emerged and radically changed the patterns people live. The data that is generated is getting bigger. Cloud computing, on the other hand, has problems with system load and speed due to the collection, processing and control of remote data. To solve this problem, fog computing has been proposed in which data is collected and processed at an edge. In this paper, we propose a system that dynamically selects a fog server that acts as a cloud in the edge. It serves as a mediator in the cloud, and provides information on the services and systems belonging to the cloud to the mobile device so that the mobile device can act as a fog. When the role of the fog system is complete, we provide it to the cloud to virtualize the fog. The heterogeneous problem of data of mobile nodes can be solved by using mDBaaS (Mobile DataBase as a Service) and we propose a system design method for this.

• 전기학회논문지
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• 제57권3호
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• pp.446-452
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• 2008

To design a spiral inductor a genetic algorithm is applied with fast computing technique. For the inductance extraction of the given geometry the fast multipole method is used, also the distributed computing technique using 10 personal computers is introduced for the massive computation of the genetic algorithm. A few important design parameters are used as genes for the optimization in the genetic algorithm. The target function is chosen as mean square error of the inductance at several sampling frequency points. A large-scaled inductor is fabricated and compared with the simulated data.

• 한국항공우주학회지
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• 제35권11호
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• pp.973-982
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• 2007

연구는 병렬 컴퓨팅 기반에서 자동화된 격자 생성 기법과 입자 군집 최적화(PSO) 알고리즘을 적용한 최적 설계 프레임워크를 개발하여 이를 인공위성 어댑터 모듈의 구조 최적 설계에 적용하였다. 자동화된 격자 생성 기법을 적용하여 구조 형상 변화를 가능하게 함으로써 폭넓은 범위에서 최적 형상 모델을 도출할 수 있었다. 또한 최적화 알고리즘인 PSO 알고리즘을 병렬 계산환경과 접목하고, 계산 성능을 최대화하기 위해 비동기식 PSO 알고리즘을 개발하였다. 그 결과 최적화에 걸리는 계산 시간을 줄일 수 있었다. 최적화 작업에서 제한 조건으로는 고유진동수와 어댑터에 발생하는 최대 응력 값을 고려하였다. 결과적으로 인공위성 어댑터 모듈의 최적 설계를 통해 인공위성 구조 질량 감소를 유도해 내었다.

• 산경연구논집
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• 제10권11호
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• pp.71-80
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• 2019

Purpose: The purpose of this study is to design the curriculum of Basic College Software Programming to develop creative and logical-thinking. This course is guided by algorithmic thinking and logical thinking that can be solved by computing for problem-solving, and it helps to develop by software through basic programming education. Through the stage of problem analysis, abstraction, algorithm, data structure, and algorithm implementation, the curriculum is designed to help learners experience algorithm problem-solving in various areas to develop diffusion thinking. For Learners aim to achieve the balanced development of divergent and convergent-thinking needed in their creative problem-solving skills. Research design, data and methodology: This study is to design a basic software education for improving algorithm-thinking for non-major. The curriculum designed in this paper is necessary to non-majors students who have completed the 'Creative Thinking and Coding Course' Design Thinking based are targeted. For this, contents were extracted through advanced research analysis at home and abroad, and experts in computer education, computer engineering, SW education, and education were surveyed in the form of quasi-openness. Results: In this study, based on ADD Thinking's algorithm thinking, we divided the unit college majors into five groups so that students of each major could accomplish the goal of "the ability to internalize their own ideas into computing," and extracted and designed different content areas, content elements and sub-components from each group. Through three expert surveys, we established a strategy for characterization by demand analysis and major/textbook category and verified the appropriateness of the design direction to ensure that the subjects and contents of the curriculum are appropriate for each family in order to improve algorithm-thinking. Conclusions: This study helps develop software by enhancing the ability of students who practice various subjects and exercises to explore creative expressions in various areas, such as 'how to think like a computer' that can implement and execute their ideas in computing. And it helps increase the ability to think logical and algorithmic computing based on creative solutions, improving problem-solving ability based on computing thinking and fundamental understanding of computer coding and development of logical thinking ability through programming.

• 한국IT서비스학회지
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• 제3권1호
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• pp.101-115
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• 2004

The phrase "Ubiquitous Computing" has become popular ever since Mark Weiser used it in an article. It is to realize a computerized environment in which small computers are embedded and cooperate with each other. This environment will support many activities of our daily life. In a Ubiquitous Computing environment, various devices will be connected to the network from houses and buildings. Therefore it is necessary to ensure network security and to protect private data from tapping, falsification and the disguising of identity by others. This study reviews the Ubiquitous Computing technologies in detail and outlines the design concept of the Stream Cipher Algorithm.

• Journal of Information Processing Systems
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• 제16권6호
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• pp.1281-1292
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• 2020

More and more cloud computing services are being applied in various fields; however, it is difficult for users and cloud computing service platforms to establish trust among each other. The trust value cannot be measured accurately or effectively. To solve this problem, we design a service-oriented cloud trust assessment model using a cloud model. We also design a subjective preference weight allocation (SPWA) algorithm. A flexible weight model is advanced by combining SPWA with the entropy method. Aiming at the fuzziness and subjectivity of trust, the cloud model is used to measure the trust value of various cloud computing services. The SPWA algorithm is used to integrate each evaluation result to obtain the trust evaluation value of the entire cloud service provider.

• Journal of the Korean Statistical Society
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• 제22권2호
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• pp.249-258
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• 1993

It is well known that design matrix X for any factorial design can be represented by a product $X = TX_o$ where T is replication matrix and $X_o$ is the corresponding balanced design matrix. Since $X_o$ consists of regular arrangement of 0's and 1's, we can easily find the spectral decomposition of $X_o',X_o$. Also using this we propose an efficient algorithm for computing the orthogonal projection matrix for a balanced factorial design.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제9권3호
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• pp.198-205
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• 2009

In this paper, design of framework architecture of pervasive computing system providing seamless inter space interactions between private and public smart spaces is presented. The seamless inter space interaction issues are related to establishing user's service environment by allocating relevant resources in a new location where there are no prior settings for the user or where there are current users already being served in the new location. In the realm of pervasive computing, we can have different types of smart spaces, offering proactive and intelligent services, which are islands of smart spaces independent from each other. As users move about, they will have to roam from private smart space to public smart space and vice versa. When they enter a new island of smart space, they will have to setup their devices and service manually to get the same or different services they had at the previous location. Users might be living in a non-pervasive computing environment because this manual operation is inappropriate to its generic features of proactive and intelligent services of pervasive computing. The framework architecture will provide seamless inter space interactions initiated by changes in users' location to acquire negotiations of resources for new and current residents regarding service provision with limited available networked devices.

• 디지털콘텐츠학회 논문지
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• 제14권2호
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• pp.171-178
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• 2013

데스크톱 그리드 컴퓨팅은 이질성과 휘발성을 갖는 데스크톱 자원을 활용하여 대용량의 컴퓨팅 작업을 수행한다. 그러나 이러한 컴퓨팅 환경에서는 서로 다른 성능을 갖는 데스크톱 자원의 연산 참여와 이탈이 자유롭기 때문에 연산 수행의 안정성과 신뢰성을 보장하지 못한다. 따라서 본 논문에서는 데스크톱 그리드 컴퓨팅에 연산 수행의 안정성과 신뢰성을 제공하기 위한 방안으로 k-means 클러스터링 알고리즘을 이용한 자원 그룹핑 기법을 설계한다. 아울러, 실제 데스크톱 그리드 시스템의 연산 수행 로그 데이터에 기반하여 자원 그룹핑을 수행하고, 데스크톱 자원 그룹에 대한 결함포용으로의 적용 방안을 제시한다.

• 디자인학연구
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• 제17권3호
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• pp.403-412
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• 2004

유비쿼터스 컴퓨팅이 가져올 변화는 종합적인 환경의 변화로서 이러한 변화는 사람들의 삶의 모습을 어떻게 바꿔 놓을 것이며 이때 사람들이 필요로 하는 것은 무엇인지를 이해하여 유비쿼터스 컴퓨팅 환경에 적절한 서비스를 개발하는 일이 이루어져야 한다. 유비쿼터스 컴퓨팅 환경에서의 디자인은 사람들의 생활(life)을 디자인하는 개념으로, 미래의 생활에 대한 예측을 효과적으로 할 수 있는 시나리오를 개발하는 것은, 디자인 컨셉(concept)을 효과적으로 개발할 수 있는 기반을 만드는 것이라 할 수 있다. 하지만 기술의 발전 경향과 그를 통해 미래를 예측하고 적절한 서비스 시나리오를 개발하는 과정 사이에는 명확한 방법론의 부족으로 간극이 존재한다. 대부분의 현재 개발된 시나리오들은 서비스가 제공될 환경의 복잡, 다차원적인 측면들을 정확하게 파악한 서비스를 제시하고 있지 못하다. 유비쿼터스 컴퓨팅 환경 하에서의 서비스는 사용자의 컨텍스트(context: 정황, 배경, 환경)를 파악하고 그에 맞춰 필요한 정보를 가장 적절한 방법으로 제공하는 형태여야 한다. 이를 위해서는 사용자가 언제, 어디서, 어떠한 형태의 서비스를 필요로 할 것인지 서비스 개발의 관점에서 사용자의 생활과 환경을 명확히 파악하는 일이 필요하다. 그리고 이를 바탕으로 미래의 UC(Ubiquitous Computing) 서비스를 제안할 수 있는 방법이 필요하다. 본 연구는 이를 위해 미래의 가정을 중심으로 서비스 개발의 관점에서 가정에서의 사용자 컨텍스트를 분석하고 이를 기반으로 서비스를 제안하기 위한 UC 서비스 시나리오를 개발하는 방법론에 대한 연구를 진행하였다. 본 연구를 통한 방법론의 적용으로 가정에서의 사용자 컨텍스트를 체계적으로 살피고 서비스 개발에 보다 효과적으로 활용될 수 있게 분석할 수 있었으며, 다양한 사용자 컨텍스트에 미래의 생활상을 충분히 반영한 UC서비스 시나리오의 개발이 원활히 진행될 수 있었다.