• Journal of Communications and Networks
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• 제2권1호
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• pp.46-57
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• 2000

Ongoing standardization effort on 3G cellular system in 3GPP (UNTS) is based on GPRS core network and promises a global standard for systems capable of offering ubiquitous access to internet for mobile users. Considered radio access systems(FDD CDMA, TDD CDMA, and EDGE) are optimized for robust mobile use. However, there are alternative relatively high-rate radio interfaces being standardized for WLAN (IEEE802.11 and HIPER-LAN/2) which are capable of delivering significantly higher data rates to static or semi-static terminals with much less overhead. Also WPANs(BLUETOOTH, IEEE802.15), which will be present in virtually every mobile handset in the near future, are offering low cast and considerable access data rate and thus are very attractive for interworking scenarios. The prospect of using these interfaces as alternative RANs inthe modular UMTS architecture is very promising. Additionally, the recent inclusion of M-IP in the UMTS R99 standard opens the way for IP-level interfacing to the core network. This article offers an overview into WLAN-Cellular interworking. A brief overview of GPRS, UMTS cellular architectures and relevant WLAN standards is given. Possible interworking architectures are presented.

• International Journal of Human Ecology
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• 제7권2호
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• pp.17-27
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• 2006

The purpose of this research was to find out the preferences in HMUBs for living space in respondents' later life. For this purpose, this research was conducted by social survey research using a questionnaire for those who lived in an urban area around Seoul. The data was collected from November to December, 2005. The results of this research were as follows. Firstly, respondents agreed with living in high rise mixed use buildings in their later life because of convenience. Willingness to move into HMUBs was positive. Concerning preferred physical features, residents preferred living in either lower floors or higher floors because of safety or fine views. Regarding the usage of common space and facilities, they wanted to use them with other generations and preferred 2 bedroom type unit located in a suburban area. Secondly, the preference for living in a HMUB in later life was higher in women respondents than in men. Thirdly, the preference for living in a HMUB in later life was higher in upper floors than lower floors according to property and asset value. As a conclusion, the development of HMUB housing for older people has a bright prospect for urban residents in Korea.

• Structural Engineering and Mechanics
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• 제51권2호
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• pp.215-228
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• 2014

Traditional beam connections to the minor axis of a column have relatively low strength and stiffness. A modified detail, using a plate welded between the toes of the column flange - referred to as a toe plate connection - is examined in this paper. The results of an experimental investigation for both flush and extended end-plate connections connected to a 25 mm thick end-plate are presented. The tests are complemented by finite element modelling which compares very well with the test observations. The results show a significant increase in both moment resistance and initial stiffness for this connection detail compared with connections made directly to the column web. This offers the prospect of more optimal solutions taking advantage of partial strength frame design for the minor axis as well as major axis.

• 한국항해항만학회지
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• 제30권7호
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• pp.585-590
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• 2006

Though the issue on the integration of maritime transport market in Northeast Asia has a long history, there has never been any notable progress. Especially the lack of country-wise analysis on the barriers of market integration appears as a serious problem for more concrete discussion and the design of the roadmap for market integration. This study analyzes the maritime market of each country in the aspect of infrastructure provision, the development of the industry, change of institutions, and network connectivity and compare the competitiveness of 3 countries in the Northeast maritime market. Furthermore this study analyzes the barriers for market integration on the basis of bilateral relation, i.e. Korea-Japan, Korea-China and Japan-Korea. Based on these analyses, this study finds out the fact that the most serious barrier for market integration among 3 countries is the egocentric policies for the protection of industries in each country rather than any other institutional or physical barriers. In conclusion, this study argues that 3 countries should try to find out a third policy alternative which can make 3 countries enjoy the win-win game, such as route integration among 3 countries and joint venture for the liners operated in the region.

• 한국산림과학회지
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• 제97권1호
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• pp.45-52
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• 2008

본 연구의 목적은 MDF산업의 지속적이고 안정적인 육성을 위해 MDF 생산장기전망에 의한 침엽수 원목공급방안을 제시하고자 하는 것이다. 이를 위해 고전적최소자승법(Ordinary Least Squares Method, OLS)을 이용하여 장기공급함수모델을 개발하였다. 그 결과 MDF의 국내 생산량이 2005년 1,653천$m^3$에서 2050년 2,041천$m^3$으로 증가하는 것으로 전망되었다. 국산 침엽수원목의 MDF 원자재 공급량은 2050년에 2,041천$m^3$의 MDF를 생산하는데 약 1,355천$m^3$이 소비되는 것으로 나타났다. 현재 MDF원자재로 사용되고 있는 리기다소나무의 경우 2050년도에 국산재 원목공급에 필요한 벌채면적은 10,828ha인 것으로 추정되었다. 낙엽송은 9,160ha의 벌채면적이 필요한 것으로 추정되었다. MDF생산의 국산원목사용량의 구성비 시나리오를 35%, 45%, 55%의 3가지로 나누어서 2050년에 침엽수 수종별 예상 연간 벌채량과 총 조림면적을 구하였다. 벌채면적을 기준할 경우 낙엽송을 식재하는 것이 유리하지만 각 수종별 용도 및 생육적 특성이 있으므로 MDF원자재를 공급하려고 하면 어느 정도 이러한 점을 고려한 조림정책이 이루어져야 할 것이다. 그리고 리기다소나무 벌채 후 활엽수 조림정책을 실시하더라도 현재의 MDF 보드산업의 안정적인 육성을 위해서는 MDF의 원자재 공급에 필요한 침엽수종의 일정 면적이 유지 및 관리되는 것이 필요하다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.75-83
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• 2003

Diode laser absorption system is advantageous of their non-invasive nature, fast response time, high sensitivity and real-time measurement capability. Furthermore, recent advances in room-temperature, near-IR and visible diode laser sources for telecommunication, optical data storage applications are enabling combustion diagnostics system based on diode laser absorption spectroscopy. So, combined with fiber-optics and high sensitive detection strategies, compact and portable sensor system are now appearing for a variety of applications. The objective of this research is to take advantage of distributed feed-back diode laser and develope new gas sensing system. It experimentally found out that the wavelength, power characteristics as a function of injection current and temperature. In addition to direct absorption and wavelength modulation spectroscopy have been demonstrated in these experiments and have a bright prospect to this diode laser system.

• 전자통신동향분석
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• 제30권2호
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• pp.14-21
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• 2015

나날이 빨라지는 기술혁신의 시대에 새로운 경제 성장동력을 확보하기 위해서는 미래 유망기술을 선제적으로 포착하고 연구개발을 통해 해당 기술의 주도권을 확보하는 것이 필수적이다. 이를 위해서는 사회, 시장, 산업, 기술 등 다양한 요소를 고려해 미래에 유망할 것으로 기대되는 기술개발 영역을 발굴하는 체계적이고 합리적인 방법론이 요구된다. 본 연구에서는 ICT 융합기술의 발전 방향성, 인문사회적 미래변화 양상, 기술이 탄생되고 소비되는 산업과 시장의 특성 변화 등을 통합적으로 고려해 미래 유망기술을 분석하고 전망하는 방법론으로써 TCM(Tech-Contour Map)을 제안한다. TCM 방법론을 매력도와 생존력이라는 관점에서 미래기술이 가진 특성을 분석해 향후 기술의 진화양상을 전망한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1621-1623
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• 1997

Use of teaching pendant is the most widespread and economical way to teach desired motion to robots. It is also very primitive,time consuming and ineffective way of teaching which has not changed since the early days of robot. In order to reduce the teaching effor, a new efficient form of teaching is needed. Also, the recent robotics research trend into service robots such as home robot, nurse robot and medical robot calls for a new teaching method which is both easy and inexpensive. In this paper, the design and operation principle of a low cost force/moment sensor is presented. The proposed sensor architecture is so simple and inexpensive that it opens the prospect for a new paradigm of robot teaching which is easy and efficinet. Other prospective areas of application are tele-manipulation of robots wher it can be used in master arm, and virtual environment where it can be used as an user input device.

• 통상정보연구
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• 제5권1호
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• pp.181-202
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• 2003

This study investigates the present status and development of e-marketplace which is the most actively used in the e-trade stages from market research, searching for business partners, negotiations to contract. It also shows the present status and development of e-marketplace as an "e-trading company" designated by government, which gives prospect of profitable model of e-marketplace. Especially focused on EC21 - the best e-marketplace of Korea, this study views present status and development of EC21 and trading companies applied for EC21, government designated e-trading company, to receive electronic trading support services. In addition, we hope that the findings of this study will be a helpful material to government for making policy and framing supporting project toward leading organizations of e-trade such as Ministry of Commerce, Industry and Energy, e-trade promotion committee of Korea International Trade Association and small-ta-medium companies interested in e-trade, to activate e-trade.

• Advances in nano research
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• 제2권3호
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• pp.135-145
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• 2014

Nanomaterials synthesized by natural bioresources such as microorganisms, animals and plants in nature can also be synthesized in laboratories even on large scale. This is considered as an attractive prospect for eco-friendly or so-called green synthesis. Development of eco-friendly synthesis of biocompatible nanoparticles and their potential biomedical applications introduces the concept of nanobiotechnology. The lower cost and lesser side effects as compare to chemical methods of synthesis are the main advantages of biosynthesis. This review article demonstrates the role of various biological resources e.g. bacteria, fungi, actinomycetes, plant leaves, fruits and honey as well as animal tissues for the synthesis of nanoparticles mainly gold and silver with an overview of their potential applications.