• Journal of KIISE:Computing Practices and Letters
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• v.15 no.10
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• pp.771-775
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• 2009

As Ubiquitous era comes, the importance of service-oriented adaptive software increases. However, there are many issues in development phases of service-oriented adaptive software, like contexts and service search. Though there are many researches which manage these issues separately, still we need more integrated and mature framework for solving these issues. So in this paper, we propose an integrated framework for development of service-oriented adaptive software. Our framework defines processes and work products for development. We also perform a case study which our framework is applied to.

• The Journal of the Korea Contents Association
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• v.6 no.8
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• pp.114-123
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• 2006

The practical value of the third place using ubiquitous digital technology has been increasing rapidly, therefore it is inevitable to educate students of spatial design in the interdisciplinary education system based on the unified technology of digital in order to cultivate leading designers to adapt new era of spatial design. After a research for the unified form of spatial planning and case studies of foreign educations, this study addresses the issues to classify the interdisciplinary teaching form into three educational categories digital interactive education, digital unified education and digital creative education. Finally, the study proposes the basic form of the ideal and futuristic education of spatial design with the distinguished results after conducting the model curriculum by the above categories.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.16-20
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• 2007

SIP 기반 프레즌스 서비스는 향후 유비쿼터스 시대의 상황인지형 서비스를 비롯한 다양한 곳에 응용될 수 있는 핵심서비스이다. 또한 프레즌스 서비스는 개인의 프라이버시 문제를 다루기 때문에, 권한관리를 위해 draft로 제시되어 있는 XCAP 기반 기술이 주요 이슈로 대두되고 있다. 그러나, 현재 프레즌스 기반 구조를 활용한 응용서비스 모델이 제시되어 있지 않으며, XCAP 기반 권한관리 기술이 적용된 사례가 나와있지 않다. 본 논문에서는 VoIP에 적용 가능한 프레즌스 서비스 모델을 선정하고, 서비스 개발을 위한 프레즌스 기반구조의 적용방법, XCAP 기반 권한관리 기술의 적용방안을 설계하였다. 본 논문을 통해 중요한 서비스로 인식되면서도 마땅한 서비스가 발굴되지 않은 현실에서, 프레즌스 기반 서비스 개발 및 XCAP 기반 권한관리 기술개발을 위한 참조모델로 활용할 수 있다. 특히, 보안에 민감한 프라이버시 정보를 다루는 프레즌스 서비스 보호를 위해 XCAP 기반기술은 반드시 필요하며, 임의의 응용서비스에 독립적으로 적용할 수 있는 XCAP 기반기술의 특징을 고려하면 더욱 큰 의미를 지닌다.

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.277-282
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• 2007

유비쿼터스 시대가 도래함에 따라 실외에서 뿐만 아니라 실내에서 대상물의 위치를 결정하기 위한 기술의 필요성이 증가하고 있다. 실외에서는 GPS를 이용하여 광범위한 지역에 안정적인 서비스를 제공받을 수 있지만 건물 인근 지역에서는 위치결정에 필요한 수의 위성이 확보되지 않고， 다중경로 오차의 영향 등으로 위치결정이 불가능하고 실내에서 활용 가능한 수준의 위치 정보를 제공하는 것이 어렵다는 단점이 있다. 실내 위치 결정을 위한 다양한 방법 중에 RFID를 이용한 방법은 GPS 에 비해 위치 정확도는 낮지만 실내에서 비교적 적은 비용으로 위치 결정이 가능하므로 GPS로 위치 결정이 불가능한 지역에 시스템을 구축하면 설내/외에서 연속적인 위치결정이 가능하게 된다. 연속적 위치 결정을 위해 GPS 신호 수신이 가능한 실외 지역에서 RFID 시스템을 설치한 건물 안으로 이동하면서 수신된 데이터를 이용하여 실내외에서의 연속적인 위치결정을 수행하였다. 특히，데이터 에포크 간의 거리를 통해 이상점을 탐지하고, 이상점(Outlier)이 발생할 경우 다른 센서로 위치결정을 대체하는 기법을 제안하였고 그 결과 실내외에서 연속적인 위치결정이 가능함을 확인할 수 있었다.

• Journal of the Korea Society of Computer and Information
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• v.9 no.2
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• pp.41-48
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• 2004

Access control protocol have verified security of external mobile terminal that access to inner information sever at Ubiquitous ages. In this paper, I would design for If Access Control Protocol of considering operation time when make cipher digital signature. Public key are used Individual identification number that issued from certify communication company, and cipher algorithm are used ECDSA definition factor for generation and verification of digital signature and it used Elliptic Curve with over 160 bit Key. Also, Access control operate on If level that designed IPv6 frame architecture. I would conclude that IP Access Control Protocol have verified security and improved performance in operation time more 4 times than before protocols when through the communication of use cipher digital signature for authentication and verification.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.15 no.2
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• pp.49-70
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• 2004

This study is to analyze the present publishing media in order to grasp the trend of data development and distribution. For this, I analyze the present tendency, concentrating indices of diagram, dividing into traditional book and e-book. It also discusses the viewpoint extracted from the problems related to the data development and distribution of publishing media. Traditional books and e-books have been expending to add newly updated convergence media in digital media era in which internet represents. I discuss these changes to convergence media for the realization of 'ubiquitous' mean the evolution to transmit propagational elements from proper character of traditional book. By the same token, I examine prospect of increasing digital publishing media and other problems before distribution.

• 한국정보교육학회:학술대회논문집
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• 2011.01a
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• pp.271-279
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• 2011

With advanced technologies of information and communication technologies, ubiquitous computing becomes popular. U-learning(Ubiquitous Learning) is a new paradigm that was started with ubiquitous computing environment. U-learning has characteristics such as anytime, anywhere, any network and any device, The U-learning support system(ULSS) is the system for supporting the u-Learning. Also, with recent fashion of smart phones, their use in education becomes interested. In this paper, The ULSS is defined in smart phone environments.

• The Journal of Korean Association of Computer Education
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• v.13 no.6
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• pp.1-8
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• 2010

As ubiquitous computing is evolving, RFID/USN technology is largely applied to various fields. Although there has been much research on the improvement of educational environment using RFID/USN technology, there has been little research on the learning improvement using it. So, in this paper, we used RFID/USN technology to find out the location and situation of students for Chinese situation learning system. We developed a mobile RFID middleware for Chinese situation learning system reflecting Chinese characteristics compared with English on PDA. In USN environment, we designed a USN system, which gets the situation information through a sensor network with sensors and sends them for helping learners study in situation learning. We took a pilot test to a small group for the analysis of the system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.11
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• pp.1078-1083
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• 2013

At the ubiquitous age, applications of Wireless Personal Area Network (WPAN) technology using LEDs are in progress. However, visible light communication using LED have weakness, which deteriorates performance of communication. To reduce information losses, which is caused by optical noise, such as incandescent lamps, fluorescent lamps, sunbeam etc., proposed channel coding scheme, double binary turbo codes. In this paper, encoding scheme of the proposed system is described and simulation results are analyzed. We had expected improved performance by using double binary turbo codes. Finally, performances of the proposed system came up to our expectations.

• Journal of the Korea Society of Computer and Information
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• v.9 no.4 s.32
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• pp.41-48
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• 2004

At Ubiquitous ages I am teaching of the Fifth Generation Languages Program Tool which was producted by Korea at college, and it develop software program for Internet Electronic Commerce Information. In this paper I have researched the problems from education in Operating System and the Use of Tool that Korean 5GL Program Tool was better than Foreign Program Tool on functions and peculiarity, merits and demerits. I have a research and analysis of students response about the Using of Tool, Coding(Script), Application Programming in college education whose have had existing Foreign Tool. Also. I propose that the alternative plans which analyze out opinions from teaching professors and program developers.