• Proceedings of the Korea Information Processing Society Conference
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• 2003.11c
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• pp.1387-1390
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• 2003

XML, 데이터베이스와 관련된 연구는 세계의 여러 곳에서 활발하게 이루어지고 있다. 현재 이 분야의 연구들은 주로 기존 데이터베이스 기술을 XML 관리에 활용하는 것들이다. 이러한 추세들이 결합하여 PDA등 소규보 정보 단말기에서도 독자적으로 XML 문서를 관리하고, 경우에 따라 서버에서 관리되는 데이터를 가져와 처리하려는 요구가 커지고 있다. 따라서, 이러한 요구에 적절히 대응하기 위해서는 내장형 XML 데이터베이스 시스템의 개발이 필요하다. 그러므로 본 논문에서는 내장형 XML 데이터베이스를 조사하고 분석하였다.

• The Korean Journal of Mycology
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• v.28 no.2
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• pp.81-87
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• 2000

The optimal synthetic medium, temperature and pH range for the mycelial growth of Cordyceps scarabaeicola were PDA, $25^{\circ}C$, and pH $8.0{\sim}8.5$, respectively. The effects of carbon sources, nitrogen sources and mineral salts on mycelial growth were superior to lactose, ammonium phosphate and $CaCl_2$, respectively. Liquid spawn culture was selected out BM(brown sugar 3%, soybean flour 0.3%, potassium phosphate 0.05%, magnesium sulfate 0.05%) medium.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.363-367
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• 1999

As the subscription rate to both Internet services and wireless communications services increases rapidly, traffic in the future wireless communications will be dominated by Internet applications. Current research for wireless technology is focused to the multimedia data transmission mainly for the personal computer or notebook whose display which has large display and abundant memory. But in the near future, Internet access request from the handphone or PDA device which is already spreaded in the world will be large. Special handset terminals which has small display monitor, low capacity memory and poor processing power has to be managed differently from torrent wireless communications protocols. So, WAP Forum is organized with wireless handset manufacturers in the world and the standardization process for wireless application is being actively developed. In this paper, basic model and architecture of WAP is introduced and adaptation requirements for change from HTML documents to WML formats are proposed. Also, compression ratio gained in the transform from the existing web documents to WML is shown.

• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.15-19
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• 2011

The T-DMB(Terrestrial Digital Multimedia Broadcasting) which was developed by the convergence of digital broadcasting technology and communication technology provides us with very good quality of music like CD, and provides TV services in a super express train like the KTX whose velocity is over 300 Km per hour. The T-DMB is diffusing toward the world as a technology which is be able to provide the various convergent services of broadcasting and communication through mobile phone, PDA, dedicated terminal, and so on. A business model needed for the diffusion of the T-DMB toward the world was established and utilized to expand the T-DMB into Vietnam in the paper. In addition, this paper describes not only some predicting methods for the technological valuation of the T-DMB Total Solution, but also a case study on the marketing related to establishing the T-DMB system in order to provide the paid services in Vietnam. Finally, A couple of business models needed to globally expand the T-DMB have been provided.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.4 no.1
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• pp.63-70
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• 2010

Research and development of Assistive Technology (AT) for blind people is primarily focused on assisting mobility and improving access to information. Some particularly useful devices for aiding access to information and communication are DAISY players used with talking books, screen readers for reading screens, video magnifiers to aid low vision, Braille displays, and Braille PDAs. These essential devices have been successfully commercialized and have assisted many visually impaired people. Assistive technology devices for visually impaired people are called sensory substitution devices, because these devices substitute tactile or auditory functions for visual functions. The tactile interfaces of sensory substitution devices such as Braille displays and Braille PDAs have a bimorph type of piezoelectric actuator that forms a Braille (pin) of the Braille cells by moving up and down. KGS Corporation of Japan has more than 80% share of the worldwide market for these Braille cell actuators. Commercializing it for the first time in the world. This paper reviews the various endeavors in Japan in the research and development of tactile displays, such as Braille displays and Braille PDAs. Furthermore, it discusses sensory substitution devices that use tactile displays, focusing especially on the rotating Braille display we have developed.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.201-204
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• 2005

현재의 세계적인 트렌드인 HCI(Human Computer Interaction)에서 사용자의 기호나 의견 등을 반영하는 인터렉티브 미디어(Interactive Media)는 빠질 수 없는 주제다. 본 연구팀은 모바일 단말환경에서 사용자의 인터렉션을 통한 서비스를 제공할 수 있는 IMS(Interactive Media System)를 설계하고, 이를 PDA 상에 구현하였다. 기존의 연구들이 보여주는 링크의 형태로만 미디어를 지원하는 방식은 CPU 등의 자원이 부족한 모바일 환경에서는 부담이 될 수 있다. IMS 는 이를 벗어나 내부적으로 미디어 오브젝트를 지원하는 방식을 사용하여 모바일 환경에 적합하게 연산속도를 개선하고 있다. 또한 이러한 방식으로 인하여 생길 수 있는 문제인 미디어 포맷의 지원에 대한 제약을 극복하기 위해 확장성 있는 구조로 설계되어 이미지와 텍스트, 백터그래픽 만을 제공하던 단순한 시스템에서 H.264 와 MPEG4 AAC 와 같은 여러 모듈들이 더해졌다. 또한 OpenGL 모듈이 추가되고 3D 오브젝트들이 새롭게 정의됨으로써 IMS 는 IML 을 통해 마크업 언어차원에서 3D 그래픽을 지원할 수 있게 되었고 2D 와 3D 를 함깨 사용한 다양한 비쥬얼 구성이 가능하게 되었다. 본 논문에서는 IMS 의 확장성 있는 구조와 OpenGL 을 추가하고 새로운 미디어 오브젝트를 정의하는 과정 등을 다루며 언급한 내용을 자세히 소개한다.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.176-179
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• 2006

Tewoo refers to a traditional group of Jeju's rafts for fishing in the rough Jeju sea in the past. We propose a mobile game called 'TewooGwang' based on a fishing boat called 'Tewoo', which has a scenario of conquering the Jeju sea using unique characters symbolizing the Jeju's ocean culture. This game is a new game, which uses a character of the fishing boat 'Tewoo', the background based on only Jeju's features, the high portability of PDA, and multimedia technology. It is different from simple sports games and has various game scenarios according to interactions of Tewoo character. The structure of this game represents a storytelling, which integrates Jeju culture into cyberspace. There are stories in this game and users also can make their own stories. Thus, this game enables hi-directional communications. It presents an imaginative space, which can induce a conflictive structure made by each user, and spatial provability. Many young Jeju tourists will enjoy it because this game provides a dynamic story. Furthermore, we can contribute to serving the value-added Jeju culture of being upgraded one step through this Jeju culture based game.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.253-257
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• 2008

지능형교통시스템 (Intelligent Transportation System: ITS) 은 도로 및 교통관리, 교통정보제공, 대중교통 및 화물차량의 운영 등 교통의 전 분야에 걸쳐 정보통신 기술, 센서 및 제어 기술을 접목함으로써 교통의 효율화와 물류비용의 절감을 목표로 하고 있다. 특히, 최근에는 전자 및 통신 기술 등 첨단기술을 활용하여 현행 교통체계를 첨단화하기 위한 노력이 빠르게 진행되고 있으며, ITS는 최근 위치정보의 폭넓은 보급과 유 무선통신기술의 발전에 따라 위치정보서비스, 텔레매틱스 서비스 등과의 결합을 통해 새로운 비즈니스 모델들을 탄생시키고 있다. 또한 기존에 중점적으로 추진되어 왔던 도로 및 차량 영역뿐만 아니라 ITS 아키텍처를 구성하는 다양한 하위 시스템들간의 통신 및 정보체계 표준화와 관계된 기술, 시스템, 서비스 등의 시장이 형성되기 시작하고 있다. 이중에서도 최근에는 이동통신기술의 발전과 복합단말의 발전을 통해 통합된 기능을 갖는 이동전화, PDA, 스마트단말 등의 개인단말 뿐만 아니라 도로와 차량내의 통신을 위한 차량탑재형 단말 등의 보급으로 단거리 무선통신기술과 스마트차드 기술을 이용한 자동요금징수시스템, 위치정보기술을 이용한 위치기반서비스, GPS를 이용하여 실시간 교통정보 서비스가 가능한 텔레매틱스 서비스 등은 본격적으로 시장을 형성해 나가고 있다. 이는 기존의 ITS 분야가 ETCS(Electric Toll Collection System), AVHS(Advanced Vehicle & Highway System), CVO(Commercial Vehicle Operation)등 교통 인프라에 초점을 맞추고 있었으나 그동안의 수익모델 부재 등으로 인해 사업자들의 적극적인 투자가 이루어지지 않아 ITS 시장 활성화에 어려움이 있어 왔다는 점을 고려해 볼 때 최근 위치정보를 이용한 사용자 서비스를 통해 민간 기업의 투자 참여와 일반 사용자들의 ITS 에 대한 관심이 매우 높아지고 있다는 점은 ITS 시장의 확대에 있어 매우 긍정적인 요인될 것으로 예상되고 있다. 본 논문에서는 이러한 ITS의 세계적인 개발 및 투자 추세, 국내의 추진 동향을 통해 살펴보고 이에 따른 국내 적용에 대한 시사점을 살펴보았다.

• Information Systems Review
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• v.6 no.1
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• pp.155-166
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• 2004

As the necessity of such mobile wireless terminals as PDAs or Cellular phones drastically increases, the terminals play important role in various business areas. In this paper, a bidding system in mobile wireless environments is constructed. However, with many mobile wireless terminals modifying at the same time their (duplicated) bidding values for a given data item, data coherency for the data item becomes essential. Therefore, in this paper, a bidding system using SyncML data synchronization mechanism is proposed and constructed. SyncML is one of data synchronization mechanisms proposed by the SyncML Initiative, a consortium of mobile wireless mobile technology leaders for universal data synchronization. The bidding system is implemented and tested in LINUX, C++, and PocketPC 2000 emulator programming environments.

• Research in Plant Disease
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• v.12 no.3
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• pp.197-204
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• 2006

Crown gall on lower stem and root of chrysanthemum(Dendranthema grandiflorum Kitamura) was observed at Hwasung and Gumi in 2001 and 2004, respectively. Tumors were semi-round with rough surface texture of dark brown color. Nine isolates inducing gall formation on lower stem of chrysanthemum among twenty isolates from the tumor tissues were characterized. Their colonies were convex, glistening, circular with an entire edge and whitish or tannish cream in color on potato dextrose agar supplemented with 0.5% $CaCO_3$. The virulent isolates were rod-shaped with peritrichous flagellae, gram negative, aerobic and growing on D1M agar. Among nine virulent isolates, one isolate was identified as Agrobacterium rubi and eight isolates were A. tumefaciens based on biochemical and physiological characteristics, fatty acid profiles and substrate utilization patterns. A. tumefaciens had strong pathogenicity and broad host range compared with A. rubi. This is the first report on crown gall of chrysanthemum in Korea. To our knowledge, crown gall of chrysanthemum caused by A. rubi is first report in this study worldwide.