• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.193-196
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• 2003

시공간 빔포밍 기술은 기존의 배열 안테나가 공간만의 처리를 해온 것에 대하여 이를 시간 영역으로까지 확장하여 특정한 방향에서 특정한 시간에 도착하는 다중경로는 증폭하고 다른 다중경로는 제거하는 것을 의미한다. 본 논문은 배열 안테나를 가진 DS-CDMA에서 시스템 파라미터 부정합이 존재할 때, 시공간 빔 형성기의 성능에 대하여 연구하였다. 시뮬레이션 결과, 부정합이 존재할 때 전통적인 빔포머가 상대적으로 강인함을 보였지만 원근 문제는 해결할 수 없었으며, 실제의 추정 결과를 적용했을 때는 MUSIC 시공간 빔포머가 가장 우수한 성능을 보였다.

• Journal of Science Education
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• v.33 no.1
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• pp.69-76
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• 2009

Probabilistic reasoning and combinational reasoning are essential to build a logical thinking and a process of thinking dealing with everyday life as well as scientific knowledge. This research aims at finding the optimal period to teach reasoning to the students who haven't developed probabilistic reasoning and combinational reasoning. The treatment program was performed for 20 students from each grade who couldn't develop two parts of reasoning. The treatment program using baduk stones and cards was performed repeatedly, focusing on the specific activities. After four weeks of treatment program, the test to check the development of probabilistic reasoning and combinational reasoning was performed again and the changes of reasoning development were identified. After giving treatment program for reasoning development, 15.0%, 25.0% and 40.0% of improvement in the 4th, the 5th, the 6th graders respectively were shown. With regard to the combinational reasoning, the results showed the improvement of 20.0% in the 4th grades, 25.0% in the 5th graders and 63.2% in the 6th graders. As a result of research in the above, students, who were not formed probabilistic reasoning and combinational reasoning, could be known to be enhanced through learning, but to fail to be formed the qualitative change like the cognitive development. It is expected that this research can contribute to the improvement of students' cognitive level and there would be more active researches in different fields to improve the cognitive level of the 6th graders who are in their optimal periods to learn two parts of reasoning.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.2
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• pp.201-207
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• 2003

A multi-hop ad-hoc network can be formed out of Bluetooth capable devices through the use of scatternets. Many topologies can be deployed for scatternet; the most commonly proposed topology in the literature are tree structure and ring structure. We analyze the performance between tree formation algorithm and ring formation algorithm. We then present quantative result that compare the expected traffic performance between Blutooth ring scatternet and Bluetooth tree scatternet. The simulation results showes that Ring structure of scatterent have good performance than Tree structure over mobile environments.

• Journal of the Korean Geographical Society
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• v.33 no.2
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• pp.309-324
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• 1998

본 연구는 급속한 기술변화와 경쟁심화에 의해 생산체계의 분화가 촉진되고 있는 컴퓨터산업을 사례로 기업간 네트워크의 형성실상과 요인을 분석하였다. 네트워크는 거래원리와 기업간 관계의 측면에서 정의되었으며 하청과 협력네트워크로 구분하였다. 설문조사 결과에 의하면, 하청네트워크는 약 75%, 협력네트워크는 약 85%의 기업이 참여하고 있어 어떤 형태로든 상당수의 기업이 네트워크를 형성하고 있다. 협력네트워크는 물론 하청네트워크도 거래기업간 보완성과 전문성에 의해 지속적인 거래관계로 형성되고 있다. 이것은 기업간 네트워크가 다층화된 생산체계에서 외부기업의 자원을 이용하여 경쟁력을 강화하는 기업전략임을 의미한다. 따라서 기업간 네트워크는 세계화-지방화 시대의 경제공간구조의 변화를 살펴볼 수 있는 중요한 지표가 될 수 있다.

• Korean Journal of Social Welfare
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• v.59 no.1
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• pp.275-300
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• 2007

This study explores the trends and implications of social welfare qualitative research in Korea. The results are follows. At present, social welfare qualitative research is entering in the quickening period. The characteristics of configuration of social welfare qualitative research in Korea are overwhelming inferiority in post-positivism and heuristics, wide differences between universities in metropolitan area and in local area at the aspect of amounts of qualitative research products, rapid increase in the interests of qualitative research in doctoral candidates, and distinguishment of doctoral candidates as a leader group in qualitative research. The results of critics of qualitative researches are follow: 1) initiative of naturalistic interpretism 2) inclination of methodicism 3) poorness of critical themes 4) propensity in grounded theory. These trends of social welfare qualitative research in Korea, in spite of the limits, have various implications: 1) Trying to critics of social welfare knowledge based on positivism and formation of opposing discourse to positivism 2) diversification in paradigm of inquiry 3) spread of narrative thinking of social welfare phenomenon.

• Journal of the Korea Society of Computer and Information
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• v.25 no.3
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• pp.251-260
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• 2020

In this paper, we propose to understand the conceptual structure of programming elements that learners form during the prototyping theory. To do this, we reviewed previous studies on the meaning of conception and prototype theory and conducted a course of problem-solving programming for 33 university students who had no prior experience in programming, and collected transcription materials through conceptual metaphorical writing. The conclusions of this study are as follows: 1) Identifying the conceptual structure of learners as a conceptual metaphor can enhance the effectiveness of programming education. 2) Learners need to reinforce the experience of forming abstract attributes to form mature programming concepts. 3) The concept of programming differs in the structure of multi-level concepts that students, teachers, and professional programmers have in each group. 4) Programming elements should intentionally block misconception risks in the meaning of symbols. 5) Concept evaluation tools should be developed to check whether various attributes can be applied.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.952-955
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• 2014

본 논문에서는 정보 검색 분야에서 잘 알려진 잠재 의미 분석 방법과 계층적 군집화 방법의 단점을 상호 보완하여 보다 효율적인 정보 검색을 위한 혼합형 군집화 방법을 제안한다. 먼저, 잠재 의미 분석 방법은 벡터 연산을 통하여 자동적으로 문서 내에 있는 잠재적인 의미를 찾는 정보 검색분야에서 많이 사용되는 고전적인 방법이다. 그러나 이 방법은 언어의 유의성이나 다의성으로 인하여 발생되는 백-오브-워드(bag-of-word) 문제를 가지고 있다. 두 번째 방법인 문서 군집화를 위하여 범용적으로 사용되고 있는 계층적 군집화 방법이다. 이 방법은 이를 통하여 분석된 군집의 질적 측면에서 볼 때, 여전히 단층적 군집들이 많이 형성되어 세부적인 분석을 통한 추가적인 군집화가 필요함을 알 수 있다. 따라서, 본 논문에서는 앞서 언급한 문제점을 해결하기 위하여 혼합적인 방법으로 잠재 의미 분석 방법을 이용한 응집 계층 군집화 방법을 제안한다. 제안한 방법을 이용하여 잘 알려진 두 개의 데이터에 적용하고 기존의 방법과 그 결과를 비교함으로써 군집의 질적 측면에서의 우수함을 보인다.

• Journal of Korean Library and Information Science Society
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• v.46 no.3
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• pp.277-299
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• 2015

The purpose of this study is to build a metadata set based on the semantic structure of the Korean studies research articles. For this purpose, we analyzed the related researches which suggested the semantic structure of the research articles, categorized the concepts of author keywords of the Korean studies research articles, and drew the metadata set of 16 elements from the results of the analysis and the categorization. The significance of this study is that it propose a semantic metadata configuration methodology which can reflect the scholarly sense-making of researchers in Korean studies. Especially, this study is significant because it reflects the keywords which was given by the actual researchers to examine the content characteristics of the Korean studies research articles.

• The Journal of the Korea Contents Association
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• v.18 no.4
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• pp.77-88
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• 2018

In this study, we conducted an experiment with the 219 undergraduates to find out the controlling effects of the verbal anchoring (low, high, non) in the nostalgia ads and the consumers' responses according to the product types (emotional/rational). The results suggest the higher the standards of the effects of the verbal anchoring are, the more favorably the preferences to the ads and the purchasing intention are formed regardless of the existence of the nostalgia. The following reveals that the controlling effects of the verbal anchoring in the nostalgia ads have differences between the purchasing intention and the preferences to the ads as to both the nostalgia familiarity and the product types. In the preferences to the ads in case that the standards of the effects of the verbal anchoring are low, the differences between familiarity group and non familiarity one are not noticeable but in the purchasing intention the differences between the low case and non of the standards of the effects of the verbal anchoring are a little more noticeable.

• Journal of the Korean Society for information Management
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• v.35 no.3
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• pp.101-121
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• 2018

This study proposes the analysis method in sentence semantics that can be automatically identified and processed as appropriate items in the system according to the composition of the sentences contained in the data corresponding to the logical semantic structure metadata of the research papers. In order to achieve the purpose, the structure of sentences corresponding to 'Research Objectives' and 'Research Outcomes' among the semantic structure metadata was analyzed based on the number of words, the link word types, the role of many-appeared words in sentences, and the end types of a word. As a result of this study, the number of words in the sentences was 38 in 'Research Objectives' and 212 in 'Research Outcomes'. The link word types in 'Research Objectives' were occurred in the order such as Causality, Sequence, Equivalence, In-other-word/Summary relation, and the link word types in 'Research Outcomes' were appeared in the order such as Causality, Equivalence, Sequence, In-other-word/Summary relation. Analysis target words like '역할(Role)', '요인(Factor)' and '관계(Relation)' played a similar role in both purpose and result part, but the role of '연구(Study)' was little different. Finally, the verb endings in sentences were appeared many times such as '~고자', '~였다' in 'Research Objectives', and '~었다', '~있다', '~였다' in 'Research Outcomes'. This study is significant as a fundamental research that can be utilized to automatically identify and input the metadata element reflecting the common logical semantics of research papers in order to support researchers' scholarly sensemaking.