• Electronics and Telecommunications Trends
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• v.9 no.4
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• pp.75-82
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• 1994

언제, 어디서나, 누구와도' 통신이 가능하게 한다는 궁극적인 목표를 가지고 통신의 개인화가 연구되고 있으며, 통신 선진국에서는 PCS를 실현하기 위한 PSTN(Public Switching Telephone Network) 접근 방법의 초기 단계로 CT2 (Cordless Telephone 2)의 개발과 시험망 운영을 하고 있거나 이미 서비스를 상용화하고 있다. CT2는 1989년 영국에서 제안되었고 1992년 유럽 표준 (I-ETS 300-131)으로 채택된 후 유럽 각국과 홍콩이나 싱가포르 같은 도시 국가에서 활성화 되어 많은 가입자들이 이용하고 있다. CT2 이용자는 도로, 지하철 혹은 공공 장소에서는 PSTN에 연결된 CT2 기지국에 접속되어 발신 위주의 휴대 전화 서비스를 받을 수 있으며, 가정에서는 우리가 현재 사용하고 있는 무선 전화기와 동일하게 사용할 수 있는 소출력 휴대 전화 서비스로 단말기의 이동성이 어느 정도 실현된 서비스이다. 국내 CT2 사업자는 1993년 12월 체신부로 부터 시범 사업 계획의 승인을 얻어 주파수 대역 910-914 MHz에서 1995년 서울 지역에 서비스 상용화를 목표로 여의도에 시험망 운용과 함께 연구되고 있다. 본 고에서는 CT2 서비스의 일반적인 개요와 특성 그리고 제외국의 CT2 동향을 고찰해봄으로써, CT2는 어떤 서비스이며 CT2의 기술 기준 마련과 무선 인터페이스 측정 및 분석 방법을 연구하는 데 기초로 삼고자 한다.

• Journal of Korean Society for Quality Management
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• v.30 no.1
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• pp.22-46
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• 2002

Recently, increasing attention has been paid to building the software quality and software productivity due to ongoing software crisis. To overcome such problem, one of the many alternatives is to use the capability maturity model (CMM) suggested by the Software Engineering Institute(SEI), focusing on the improvement of software progress. This research is proposed the theoretical framework for CMM based on the previous studies, and review the status of software process on the software development organization. We then examine the impact of the software process capability on the organizational performance including financial measures and non-financial measures. Hypotheses on software process capability were tested 144 organizational units. The 62.5% of foreign companies are distribute to the second and third level, the Korean firms in this study are indicated the first level. Result indicate that maturity of software process may be served the key predictor of organizational performance, in particular the positive relationship between the software process and non-financial performance index such as customer service, IT Infrastructure, marketing, supplier and purchaser, production and operation.

• Journal of Agricultural Extension & Community Development
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• v.4 no.1
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• pp.359-370
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• 1997

The Korea National Agricultural College (KNAC) was established as a special three academic years(six semesters) course by the Presidential Act in July 1995 and opened on March 20, 1997. According to the Act, the students of KNAC are granted free boarding in dormitory, full support of educational expenses, and, after completion, exception in military service and financial support for farming, which is their obligation to do for a double period of the total school year. With these institutional favors KNAC is hight expected to bring up promising young farm managers in Korea. However, actual competitive young farm managers are brought up by the well organized education with emphasis on learning by doing approach. With the relation to the education this study was performed to review and examine present situation of faculty organization, facilities and equipments, curriculum including field training in home land and oversea's counties. This study found out that there were undesirable aspects such as unbalanced faculty members among the departments, lack of practice farm land and limited budget in field training, which should be improved to achieve the objectives of KNAC.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.758-762
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• 2007

Revenue management is a new approach method to solve the problem of supply and demand, and one of fields which is diffused quickly at the service enterprise to use perishable-asset like the transportation business. It is based on multiple fare policy that discount charge reservation should be received if the benefit value of current discount fare is more than expected profit of the normal fare reservation it will be able to occur in future when suitable goods is sold to the customers at discount fare, at the time they want, and at assigned seat by controlling supply and demand from market. In this research, I will review on initial operation case for special class goods that the seat which is limited is assigned at some of train and portion of KTX for demand dispersion and new demand creation at peak time, put a limit in purchase conditions, and provides discounted fare. I will also try to find implication for strategic operation.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.191-196
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• 2007

This paper is reviewed RAM(Reliability, Availability and Maintainability) data table utilized for RAM data management to Urban Maglev Transit. As railway systems become more complex, the RAM requirements are reinforced to ensure that a design meets Reliability, Availability, Maintainability criteria. Therefore, it needs the efficient management for RAM data of railway system to meet RAM target. At this study, RAM data management format is suggested to ensure reliability and maintainability based on acquired experience for overseas rolling stock. This RAM data table and FMECA(Failure Mode Effect Criticality Analysis) table are useful to the calculation of MTBF(Mean Time Between Failure), MTBSF(Mean Time Between Service Failure) and Maintainability. Also, this RAM management table will be efficient to improve the RAM evaluation to Urban Maglev Transit.

• Journal of Fisheries and Marine Sciences Education
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• v.24 no.2
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• pp.302-310
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• 2012

This study was focused on tourists visiting the Chujado, Jeju Special Self-Governing Province as island tourism. First, this study collected the selection attributes visiting Chujado from literature review and applied the IPA (Importance-Performance Analysis)with the attributes to this research. The results are as follows: First, in the area I, the attributes (climates, exotic atmosphere, tourism information, reservation service, a variety of food, clean food etc.) both with high importance and high performance need to be kept continuously. And, in the area II, the IPA map showed that other attributes (accessibility, a variety of food, accommodation, affordable price etc) with high importance and low performance) need to be improved in the future time. These results can give the implications for establishing an appropriate policy of Chujado tourism development.

• Nuclear Engineering and Technology
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• v.44 no.2
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• pp.113-150
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• 2012

The point we made in this paper is that, although detailed and precise three-dimensional (3D) whole-core transport calculations may be obtained in the future with massively parallel computers, they would have an application to only some of the problems of the nuclear industry, more precisely those regarding multiphysics or for methodology validation or nuclear safety calculations. On the other hand, typical design reactor cycle calculations comprising many one-point core calculations can have very strict constraints in computing time and will not directly benefit from the advances in computations in large scale computers. Consequently, in this paper we review some of the deterministic 3D transport methods which in the very near future may have potential for industrial applications and, even with low-order approximations such as a low resolution in energy, might represent an advantage as compared with present industrial methodology, for which one of the main approximations is due to power reconstruction. These methods comprise the response-matrix method and methods based on the two-dimensional (2D) method of characteristics, such as the fusion method.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.1252-1258
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• 2000

Koreasat-3 was successfully launched by an Ariane IV launch vehicle on September 5, 1999. Although the primary purpose of the satellite is to replace Koreasat-l, it also can extend its communication service coverage over the Asia-Pacific region. A spacecraft is subjected to severe dynamic loads during launch period. To verify the safety of spacecraft under the launch environment, dynamic tests should be performed such as sine sweep, acoustic and separation shock tests. This paper presents the launch environment test results of Koreasat-3. A total of 188 acceleration responses was measured and compared with the design requirements of components and spacecraft. Dynamic characteristic change was also investigated by comparing between low-level pre/post vibration results. From the review of test results, it is concluded that Koreasat-3 was designed and manufactured with the margin of safety enough to survive the launch loads of Ariane IV.

• Parasites, Hosts and Diseases
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• v.41 no.1
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• pp.1-16
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• 2003

Neospora caninum is a coccidian parasite of animals. It is a major pathogen for cattle and dogs and it occasionally causes clinical infections in horses, goats, sheep, and deer. Domestic dogs are the only known definitive hosts for N. caninum. It is one of the most efficiently transmitted parasite of cattle and up to 90% of cattle in some herds are infected. Transplacental transmission is considered the major route of transmission of N. caninum in cattle. Neospora caninum is a major cause of abortion in cattle in many countries. To elicit protective immunity against abortion in cows that already harbor a latent infection is a major problem. This paper reviews information on biology, diagnosis, epidemiology and control of neosporosis in animals.

• Journal of Korean Institute of Industrial Engineers
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• v.37 no.4
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• pp.271-278
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• 2011

This paper is to review and organize performance strategies, issues, and measures for the efficient operation of order picking function. Order picking is the process of retrieving items from storage to meet a specific customer order, which is known to be the most labor-intensive and costly function among all the warehouse functions. This function is also important in that it has a critical impact on downstream customer service. For understanding the background of order picking and related performance issues, we will briefly introduce warehousing functions. Then we will introduce material handling within a warehouse and order picking strategies. Lastly, we will discuss about performance issues and measures in the domain of order picking operations. Productive and quality measures will be reviewed in more detail.