• 전기의세계
• /
• v.29 no.9
• /
• pp.584-593
• /
• 1980

Conventional radar antenna systems are susceptible to performance degradation caused by unwanted signals received via the antenna sidelobes and/or mainlobes. Adaptive array systems offer possible solution to this interference problem by automatically steering nulls to unwanted signals providing significant system performance improvement. Another important andvantage of the adaptive array is its self-optimization capability which uses the collective incoming noise data for the nulling purposes. This paper provides a tutorial introduction to adaptive arrays as well as some new development of recent research in this area. Optimum link between the antenna theory and signal processing has been sought by illustrating the gain patterns and output signal-to-noise ratio. Signal acqusition methods are shown including a new attempt of the use of spread-spectrum techniques in conjuction with array systems.

• Journal of the Korea Safety Management & Science
• /
• v.3 no.2
• /
• pp.51-63
• /
• 2001

Korea gas industrial because of received LNG in 1987 was converted by the Gas Safety Management System in relation to city gas, LPG and LNG. Gas accident were caused by treatment problem on the supplier and user, on technical and use management mater, on facilities and goods, and included problem with gas safety connection system. This study is present standard application plan of each department to use planning gas technical standard and gas utilization standard of introduction model than statute for change of self-regulation management system and complicated regulation of examination center and order.

• Korean Journal of Mathematics
• /
• v.32 no.1
• /
• pp.83-95
• /
• 2024

The Quaternionic Dirac operator proves instrumental in tackling various challenges within spectral geometry processing and shape analysis. This work involves the introduction of the quaternionic Dirac operator on a symplectic submanifold of an exact symplectic product manifold. The self adjointness of the symplectic quaternionic Dirac operator is observed. This operator is verified for spin ${\frac{1}{2}}$ particles. It factorizes the Hodge Laplace operator on the symplectic submanifold of an exact symplectic product manifold. For achieving this a new complex structure and an almost quaternionic structure are formulated on this exact symplectic product manifold.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.1 no.2
• /
• pp.135-155
• /
• 2006

The purpose of this paper IS to examine the differences of cognition between self-management and corporation in report and payment of Value Added Tax. And then We want to suggest the policy of improvements to reduce the resistance of tax-payer in V.A.T. Data was collected for 250 firms' samples from the self-employed and corporation in Daegu Seongseo Industry District. The main results of empirical study are as follows. First, Value Added Tax is not fair in all companies. But It couldn't find the differences between self-employed a d corporation in statistical meaning. Second, It was found the cooperatives generally think to pay the taxes in rule, but self-employed not do it in the report and payment of Value Added Tax. But we couldn't find the important differences between self-employed and corporation in statistical meaning. We propose to improve the polices of introduction of tax rates of multiples in the charging and to redesign the definition of a tax-payer of value added tax to reduce the resistance in report and payment.

• Korean Medical Education Review
• /
• v.16 no.1
• /
• pp.42-49
• /
• 2014

The purposes of this study were to identify and analyze students' attitudes and satisfaction to the portfolio process and assessment for the Introduction to Clinical Medicine course at Ewha Womans University School of Medicine in Seoul, Korea. The subjects consisted of 64 medical school students. Questionnaires consisting of 20 5-point Likert-type items were developed, including three question domains: 1) orientation, 2) portfolios in general, 3) individualized feedback. The mean and median were found and frequency analysis was performed to identify the common characteristics of the participants. A major finding was that 54.7% of the respondents felt that the self-reflection involved in building the portfolio was a valuable learning experience. Plus, the majority of respondents perceived that the individualized feedback had a positive tone and its contents were specific, practical, and constructive. The students perceived that building and writing portfolios heightened their understanding of exit learning outcomes and enhanced their reflective thinking and self-directed learning skills. Meanwhile, some students perceived that there was too much paperwork in the portfolio process and that the process was time consuming. Furthermore, 32.8% of the respondents said that they had difficulty establishing their learning strategies by themselves and self-directing their learning during the portfolio process. In conclusion, it is expected that building a portfolio can help students not only to enhance their ability to accumulate and use their personal learning resources but also to develop the professional qualities required by doctors, such as self-directed learning, self-reflection, lifelong learning, team work, organizational skills, time management and prioritization, and professional thinking and behavior.

• Journal of the Korean Society of Costume
• /
• v.50 no.8
• /
• pp.149-163
• /
• 2000

The purpose of this study is to research the Korean and Japanese costume systems and to compare both of them on the process of adopting the western-originated costumes. The consequences of this study are as follows. Chosen and Japan started simplifying the traditional clothings, Introducing the western clothings and executed the ordinance prohibitory topknots through reforming costume systems since Port Opening Treaties in 19th centra. Japan performed the reformation of costume system effectively through the grand campaign of social reforming enlightment by Meiji Government. Meanwhile in Korea, there were a continual repetition of adoption and rejection in the reformation of costume systems because of strong cultural self-esteem and competition of foreign Empires. However, western-originated cultural perspectives brought the strong self-devaluated view on their own cultures to both countries. And that's the first cause of substitution of western clothings for ordinary ones in both nations.

• Korean Parent-Child Health Journal
• /
• v.9 no.2
• /
• pp.101-115
• /
• 2006

Purpose: The purpose of this paper is to describe the development of health educational program for maternity using principle of user centered design. Method: Research process includes five distinct phases: needs assessment, analysis, design, development/testing/revision, and application release. Results: This program includes an introduction, pregnancy test and fetal assessment, maternal and fetal change during pregnancy, self-care methods during pregnancy, complication of postpartum period, process of labor, complication of pregnancy, self care during the postpartum period, information for parenting skill, father page, FAQ, helping resources and institutions. Conclusion: The program will be distributed to health centers for maternal health education. The second phase of this project was evaluation this program for further development of the program. The end result of this program will be pregnant women with a high degree of usability. Author believe this program have true potential in helping maternal health promotion and successful parenting.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2004.04a
• /
• pp.262-265
• /
• 2004

This study focused on the introduction of the self-healing technique for polymeric composites and evaluated the healing efficiency through the interlainar fracture toughness tests. The DCPD and ENB were used for a healing agent and the Grubbs' catalyst as a catalyst. The healing efficiency was evaluated by the use of mode I and the mode n fracture toughnesses. According to the results, the DCPD-ENB mixture with a suitable ratio revealed better healing efficiency than DCPD only.

• Journal of Korean Vacuum Science & Technology
• /
• v.2 no.1
• /
• pp.13-19
• /
• 1998

We have calculated the electronic structure of impurity atoms in metal host by using the tight binding model in the recursion method. For a self-consistent calculation, we assumed that the effect of impurity introduction was localized only at the impurity site and its neighbours. We calculated the Madelung term by limiting the contribution to Vm of the charge perturbations to the first shell around the impurity with Evjen technique. The calculated local density of states and charge transfer values have been compared with the experimental values for a single impurity in metal host. We fund that d-reso-nance state came from the repulsive interaction between impurity d-state and host band, and the position of d-resonance state depended on the difference of valence electrons between the host and the impurity. the results also showed that the charge transfer value between an impurity and host metal was comparable to the ionicity difference between them.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
• /
• 2003.05a
• /
• pp.69-71
• /
• 2003

This paper introduces TRIZ. TRIZ is the theory of inventive problem solving which haws started by G.Altschuler since 1946, Russia. TRIZ is applicable for not only mechanical engineering, but also science, economic and pedagogy fields. Characteristics of some kind of softwares for TRIZ method are briefly reviewed Especially Catia with IMC TechOptimizer is studied in detail and it is expected to be applicable well for the Ocean Engineering fields, if applicably applied for IM-Principles, IM-Predictions and IM-Effects, even though it will need much efforts and time to study. As an application example of TRIZ, Self-expandable anchor which is pending for patent is presented briefly.