• East Asian mathematical journal
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• 제23권2호
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• pp.261-270
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• 2007

We provide a local convergence analysis for Secant-like algorithm for solving nonsmooth variational inclusions in Banach spaces. An existence-convergence theorem and an improvement of the ratio of convergence of this algorithm are given under center-conditioned divided difference and Aubin's continuity concept. Our result compare favorably with related obtained in [16].

• Kyungpook Mathematical Journal
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• 제53권3호
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• pp.341-348
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• 2013

In this paper, the concept of supra $b$-irresolute maps is introduced and several properties of it is investigated. Furthermore, the notion of supra $b$-connectedness is defined and researched by means of supra $b$-separated sets.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.1371-1373
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• 1996

A clustering algorithms with dynamic adjustment of learning rate for GBFCM(Gradient Based FCM) is proposed in this paper. This algorithm combines two idea of dynamic K-means algorithms and GBFCM : learning rate variation with entropy concept and continuous membership grade. To evaluate dynamic GBFCM, we made comparisons with Kohonen's Self-Organizing Map over several tutorial examples and image compression. The results show that DGBFCM(Dynamic GBFCM) gives superior performance over Kohonen's algorithm in terms of signal-to-noise.

• 대한수학회보
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• 제60권4호
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• pp.1131-1139
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• 2023

In this paper, we introduce the concept of ω-expansive of random map on compact metric spaces 𝓟. Also we introduce the definitions of positively, negatively shadowing property and shadowing property for two-sided RDS. Then we show that if 𝜑 is ω-expansive and has the shadowing property for ω, then 𝜑 is topologically stable for ω.

• 한국과학교육학회지
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• 제36권2호
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• pp.295-302
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• 2016

이 연구에서는 구인 모델링 방식을 적용하여 초등학교 5학년~중학교 3학년 학생들의 용해와 용액 개념에 대한 학습발달과정을 조사하였다. 이를 위해 현행 교육과정과 선행연구를 분석하여 용해와 용액 개념 이해의 가설적 발달 경로인 초기 구인 구성도를 설정하였고, 이를 바탕으로 순위정렬 선다형 평가 문항으로 구성된 검사지를 제작하였다. 826명의 학생들을 대상으로 검사를 실시하였으며, 다분 문항반응이론의 모형 중 부분 점수 모형을 활용하여 분석한 결과를 바탕으로 구인 구성도를 수정하였다. 연구 결과, 현행 교육과정에서 학년에 따른 용해와 용액 개념의 제시 순서는 대체로 학생들의 학습발달과정에 부합하는 것으로 나타났다. 그러나 하위 정착점과 용액에서 입자의 균일 분포 개념, 용해도에 영향을 미치는 요인에 대한 이해는 구인 구성도를 통해 이론적으로 예상한 수준과 달랐다. 수정된 구인 구성도에 따라 초 중등학생의 용해와 용액 개념에 대한 학습발달과정을 도출하였다. 하위정착점인 수준 1은 용해와 용액을 입자 관점에서 인식할 수 있으나 다양한 오개념을 지니는 수준으로, 수준 2는 용액에서 입자의 균일 분포 개념을 이해하는 수준으로, 수준 3은 용해도와 입자의 보존 개념을 이해하는 수준으로 설정되었다. 또한, 수준 4는 입자간 인력을 인식할 수 있으나 다양한 오개념을 지니는 수준으로, 상위정착점인 수준 5는 입자간 인력과 용해도에 영향을 미치는 요인을 이해하는 수준으로 설정되었다.

• 대한화학회지
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• 제44권2호
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• pp.145-156
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• 2000

본 연구는 중학교 과학 교과서( 제5차 및 제6차 교육 과정), 고등학교 화학 교과서(제5차 교육과정) 및 대학 일반화학에서 화학 관련 부분 중 산화와 환원반응을 중심으로 이 학습 내용이 학생들의 사고력을 향상시키는 데 도움이 되는 적절한 연계성을 갖고 있는지를 분석하였다. 먼저 각급 학교간 배당 시간수의 차이 및 교과서 설명의 차이를 비교하였으며, 연계성 판별을 위하여 준거의 기준을 5가지로 수립하여 분석한 결과는 중학교에서 고등학교 과정의 연계시 다소 격차가 있었지만 고등학교에서 대학교 과정의 연계는 무난한 것으로 나타났다 . 이 분석결과를 이용하여 수업의 효율성을 도모하기 위하여 중등 및 대학에 이르기까지 일관된 연계성을 갖춘 각급 학교간의 새로운 교과내용 구조도를 제시하였다.

• 제어로봇시스템학회논문지
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• 제20권12호
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• pp.1181-1188
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• 2014

In this paper, we propose a novel concept foran unmanned delivery service using a cooperative heterogeneous unmanned system consisting of a self-driving car and an unmanned aerial vehicle (UAV). The proposed concept is suitable to deliver parcels in high-density and high-rise urban or residential areas. In order to achieve the proposed concept, we will develop acooperative heterogeneous unmanned system. Customers can order goods using a smartphone application and the order information, including the position of the customer and the order time, and the package is transported automatically by the unmanned systems. The system assigns the tasks suitable for each unmanned vehicle by analyzing it based on map information. Performance is validated by experiments consisting of autonomous driving and flight tests in a real environment. For more evaluation, the landing position error analysis is performed using circular error probability (CEP).

• 한국IT서비스학회지
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• 제15권3호
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• pp.211-221
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• 2016

The human spatial mobility information is in high demand in various businesses; however, there are only few studies on human mobility because spatio-temporal data is insufficient and difficult to collect. Now with the spread of smartphones and the advent of social networking services, the spatio-temporal data began to occur on a large scale, and the data is available to the public. In this work, we compared the movement behavior of residents and tourists by using geo-tagged tweets which contain location information. We chose Seoul to be the target area for analysis. Various creative concepts and analytical methods are used: grid map concept, cells visited concept, reverse geocoding concept, average activity index, spatial mobility index, and determination of residents and visitors based on the number of days in residence. Conducting a series of analysis, we found significant differences of the movement behavior between local residents and tourists. We also discovered differences in visiting activity according to residential countries and used applications. We expect that findings of this research can provide useful information on tourist development and urban development.

• The Journal of Korean Physical Therapy
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• 제28권5호
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• pp.341-347
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• 2016

Purpose: The aim of the study was to investigate items of commonly used questionnaires that measure functioning status of persons with stroke and map to the International Classification of Functioning, Disability and Health (ICF). Methods: Eighty-six patients with stroke were recruited from 12 medical institutes for the study. Each item of the Modified Bathel Index (MBI), Stroke Impact Scale (SIS), Mini Mental Status Evaluation (MMSE) and SF-36 were examined and compared its concept with the ICF. Concept linking was performed by 10 health professionals independently. A field test was performed to assess its correlation between those of scales and their linked ICF category sets. Results: It was found that 11 items in MBI was linked to 14 ICF categories, whereas 27 items of MMSE had 10 categories of ICF linked. 60 items of SIS were to be linked with 35 ICF categories. Agreement between professionals in linking was found to be high: 97.5% for MBI items, 78.0%, 78.0%, and 74.8% for MMSE, SIS, and SF-36 respectively. Strong relationship was observed between measurement scales and linked ICF code sets (r=-0.76 for SIS, r=-0.78 for MBI, r=-0.47 for MMSE) whereas there was no relationship was found between SF-36 and its ICF code set (r=-0.06) from the field test. Conclusion: It was found that items of SIS, MMSE and MBI may be linked to ICF categories. Those of linking concept between clinical tools and the ICF could be helpful for clinical data standardization.

• 건축역사연구
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• 제8권1호
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• pp.53-62
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• 1999

Modernism in architecture is a very complex and contradictory phenomena. So much so that it has been defined in various ways throughout the history, depending on one's position in the cultural and historical circumstances. It is thus necessary to map out the various concepts of modernism and their relationships in order to have a more comprehensive understanding of modern architecture. This paper attempts to define the various positions as functionalism, formalism and artistic avant-gardism, and to trace their history from the early twentieth century to the present. The change of the concept of modernism from functionalism to artistic avant-gardism seems a logical process in the history of western modem culture. The tendency of contemporary architecture to be more abstract and self referential artistic practice reflects the fragmentation of modern culture and the separation of art and technology. The validity of this position, of course, depends on how one evaluates the role of modern art in the situation of modern culture. It could be viewed either negatively or positively. However, this position is problematic in that it disregards the fundamental differences between architecture and other arts and distanced architecture farther from its material base. Given this historical perspective on the concept of modernism, modernism in Korea should not viewed simply identical to the western modernism, nor should western modernism be imported uncritically. The characteristics of her modernization and their differences from the west should be considered, along with the different status and role of architecture in korean modern society.