• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.219-225
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• 2000

본 연구에서는 이산사건 동적 시스템을 모델링하고 성능을 분석하기 위한 통합 소프트웨어를 개발하였다. 소프트웨어는 페트리네트를 기반으로 비쥬얼 C++와 비쥬얼 베이직을 이용하여 개발되었으며 윈도우즈 환경 하에서 동작하는 범용 그래픽도구를 내장하고 있다. 본 소프트웨어를 이용하면 사용자는 마우스의 드래그 앤 드롭만으로 페트리네트 모델을 작성할 수가 있으며 모델이 작성되면 수리적 분석과 시뮬레이션을 통하여 시스템의 성능분석을 자동으로 수행하여 준다. 또한 시스템의 논리적인 특성을 분석하기 위하여 coverbility tree와 reachability tree를 지원한다. 이외에도 deadlock을 탐지하고 이를 해소하는 기능과 정교한 세부 모델링이 가능하도록 다양한 활성화 함수와 분포를 지원하며 시스템의 성능척도와 관련된 다양한 통계치를 제공해준다.

• International Commerce and Information Review
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• v.2 no.1
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• pp.97-113
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• 2000

본 논문에서는 사이버무역의 활성화를 위한 산학협력 방안을 제시하기 위하여 무역업무의 새로운 패러다임인 무역자동화, 인터넷의 등장, 무역업무의 사이버화를 다루며, 사이버무역의 현황 및 전망에서는 사이버무역이 실제 무역업무에서 어느 정도 사용되고 있으며 사이버무역의 전망을 살펴보고 사이버무역의 발전가능성을 타진하여 사이버무역의 활성화를 위한 산학협력방안을 제시한다. 특히 산학 협력을 위한 방안중의 하나로 대학과 업체의 중계회사를 두어 대학에서 이를 운영하고 관리하여 업체에서 필요한 지식과 기술을 교과과정에 적용하고 이러한 교과과정을 통한 교육을 실시하여 업체에서 필요한 인력을 제공할 수 있도록 한다. 아울러 산업자원부 및 무역협회의 사이버무역인력 양성 프로그램과 호흡을 맞춰 산학협력을 위한 무역회사를 운영하고 이를 통한 이론과 실무를 함께 교육할 수 있는 기반을 마련하여 21세기 사이버무역의 기반을 제공 하고자 한다. 본 연구의 모델인 S사는 2000년 4월 설립된 회사이므로 부족한 점들이 많이 있어 이를 기반으로 산학협력을 위한 한 모델링(modeling)을 제시한다는 것이 다소 무리가 있지만, S사를 운영하면서 이를 통한 무역업체에서 요구하는 인력 및 교과과정의 조율을 통하여 미비하지만 사이버무역의 활성화에 일조하고자 하는 바램이다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.15 no.2
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• pp.67-80
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• 2020

This study has been conducted at a time when Korean government continues to extend support for youth startups as part of its policy to create jobs and the focus moves from career and employment to youth startups with a growing interest in the field of youth startups. Against this background, this study aims to identify difficulty factors of youth startups in areas besides the Seoul Metropolitan Area, seek ways to overcome difficulty factors, and propose policy implications. To this end, this study set five criteria and 25 sub-criteria to evaluate the difficulties of youth startups by reviewing previous studies and conducting literature review, and performing brainstorming method. The empirical analysis of the evaluation criteria was performed, using the analytic hierarchy process (AHP) method, on youths aged 19 to 39 in Gunsan area. The analysis results showed that the largest difficulty factors facing local youths include business model establishment, business administration and management, and startup funding in the criteria. As for sub-criteria, the largest difficulty factors are market information acquisition, technology commercialization, project feasibility, technology development, and new market pioneering in descending order. Local youths have much difficulty about the process of turning a business item into a product and commercializing it. According to a comparative analysis by gender, men were a relatively high difficulty in commercializing business models than women. men were a relatively high difficulty in commercializing business models than women. On the other hand, women were higher than men in all factors (management management, entrepreneurship, improvement of entrepreneurship system, and improvement of entrepreneurship awareness) except for factors affecting business model. In addition, the factors of entrepreneurship were found to be relatively different among young people (college students, prospective entrepreneurs, entrepreneurs). In conclusion, it was suggested that in order to revitalize youth entrepreneurship in the region, it is necessary to actively resolve the difficulties of business model commercialization rather than entrepreneurship funds. In addition, it is necessary to strategically support customized entrepreneurship support and situational administrative services because gender and hierarchical difficulties are different than general solutions. This study presented practical priorities and derivation methods for the entrepreneurship difficulties faced by local youth, and suggested measures and improvements for vitalizing local youth entrepreneurship in the future.

• Journal of The Korean Association For Science Education
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• v.41 no.5
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• pp.371-390
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• 2021

The purpose of this study is to develop a neuropsychological model for the spatial ability factor and to divide the brain active area involved in the light & shadow problem solving process into the domain-general ability and the domain-specific ability based on the neuropsychological model. Twenty-four male college students participated in the study to measure the synchronized eye movement and electroencephalograms (EEG) while they performed the spatial ability test and the light & shadow tasks. Neuropsychological model for the spatial ability factor and light & shadow problem solving process was developed by integrating the measurements of the participants' eye movements, brain activity areas, and the interview findings regarding their thoughts and strategies. The results of this study are as follows; first, the spatial visualization and mental rotation factors mainly required activation of the parietal lobe, and the spatial orientation factor required activation of the frontal lobe. Second, in the light & shadow problem solving process, participants use both their spatial ability as a domain-general thought, and the application of scientific principles as a domain-specific thought. The brain activity patterns resulting from a participants' inferring the shadow by parallel light source and inferring the shadow when the direction of the light changed were similar to the neuropsychological model for the spatial visualization factor. The brain activity pattern from inferring an object from its shadow by light from multiple directions was similar to the neuropsychological model for the spatial orientation factor. The brain activity pattern from inferring a shadow with a point source of light was similar to the neuropsychological model for the spatial visualization factor. In addition, when solving the light & shadow tasks, the brain's middle temporal gyrus, precentral gyrus, inferior frontal gyrus, middle frontal gyrus were additionally activated, which are responsible for deductive reasoning, working memory, and planning for action.

• Journal of The Korean Association For Science Education
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• v.36 no.2
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• pp.279-293
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• 2016

The purpose of this study was to analyze the effect of infographic instruction to promote the use of the scientific model in the 'lens' unit of elementary science textbooks. The participants were $6^{th}$ grade students(n=53) of G elementary school in G city, Gyeongsangnam-do. For this study, the lesson plan of the 'lens' unit consisted of three steps as investigation of students' prior concept about the lens, scientific model construction activity, and infographic construction activity. We then analyzed the results of this study from three perspectives: the scientific concept, scientific model, and infographic. Before the lesson, students focused on the external shape and material of the lens in prior concept of it. However, after the scientific model construction activity and infographic construction activity, students' scientific concept about the lens improved in the categories of features of lens, features of glasses, light path, and applications of the lens. In terms of the scientific model, use of type and frequency of scientific model increased more in the infographic construction activity than the scientific construction model activity. Also, in terms of infographic, the two infographic types as function based infographic and connection based infographic used more than non-infographic in the infographic construction activity. Also, the frequency of Gestal theory's visual perception increased more in the infographic construction activity than the scientific model construction activity.

• Journal of the Korean Society of Radiology
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• v.16 no.1
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• pp.25-34
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• 2022

Brain computed tomography (CT) is useful for brain lesion diagnosis, such as brain hemorrhage, due to non-invasive methodology, 3-dimensional image provision, low radiation dose. However, there has been numerous misdiagnosis owing to a lack of radiologist and heavy workload. Recently, object detection technologies based on artificial intelligence have been developed in order to overcome the limitations of traditional diagnosis. In this study, the applicability of a deep learning-based YOLOv5s model was evaluated for brain hemorrhage detection using brain CT images. Also, the effect of hyperparameters in the trained YOLOv5s model was analyzed. The YOLOv5s model consisted of backbone, neck and output modules. The trained model was able to detect a region of brain hemorrhage and provide the information of the region. The YOLOv5s model was trained with various activation functions, optimizer functions, loss functions and epochs, and the performance of the trained model was evaluated in terms of brain hemorrhage detection accuracy and training time. The results showed that the trained YOLOv5s model is able to provide a bounding box for a region of brain hemorrhage and the accuracy of the corresponding box. The performance of the YOLOv5s model was improved by using the mish activation function, the stochastic gradient descent (SGD) optimizer function and the completed intersection over union (CIoU) loss function. Also, the accuracy and training time of the YOLOv5s model increased with the number of epochs. Therefore, the YOLOv5s model is suitable for brain hemorrhage detection using brain CT images, and the performance of the model can be maximized by using appropriate hyperparameters.

• Proceedings of the Korean Society for Information Management Conference
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• 1994.12a
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• pp.67-70
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• 1994

정보화사회에서 정보자원의 핵심인 도서관은 출판물의 증가, 정보매체의 다양화 등으로 인해 이용자가 원하는 모든 정보를 소장한다는 것은 불가능하므로 도서관 상호대차를 통한 정보의 공유와 유통이 이루어져야 한다. 본 논문에서는 도서관정보의 공유와 유통을 활성화하기 위하여 대량의 정보를 고속으로 전송할수 있는 초고속 정보통신망을 이용한 도서관 상호 대차(ILL)시스템의 개념모델을 제안한다.

• Digital Contents
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• no.6 s.121
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• pp.121-129
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• 2003

최근 데이터베이스 관련 업계에서는 DB의 바람직한 활용모델 설정과 질적 개선 등 산업활성화를 위한 움직임이 활발해지고 있다. 특히 데이터베이스 산업의 경쟁력을 키우기 위해서는 '양적성장'보다는 '질적 수준 향상'이 시급하다는 목소리가 높다. 이에 한국데이터베이스진흥센터는 지난 5월 14일 전자신문사와 공동으로 '데이터베이스 품질향상을 위한 좌담회'를 개최, 국내 데이터베이스 품질의 현주소를 짚어봤다. 이 자리에서는 최근 DB산업의 문제점과 품질향상을 위한 다양한 방안 등이 심도 깊게 논의됐다.

• Bulletin of Korea Environmental Preservation Association
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• s.414
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• pp.6-9
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• 2014

생태관광이 지속적으로 이루어지기 위해서는 우수한 생태자원을 발굴하고 관리하는 것이 가장 기본이 된다. 이를 위해 지역과 주민이 적극 참여하여 생태자원을 발굴하고 관리해 나갈 수 있는 체계를 구축해야 하며, 환경부에서는 생태관광 성공모델을 집중 육성하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.239-241
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• 2003

무선 인터넷의 활성화와 더불어, 사용자 인중(Authentication), 권한 부여(Accounting) 그리고 자원사용(Accounting)의 세가지 AAA 서비스를 효율적으로 제공하기 위해 RADIUS와 같은 AAA프로토콜들이 사용되고 있다. 본 논문에서는 Casper와 CSP를 이용하여 RADIUS 프로토콜을 수행동작을 명세하고, 모델 체킹 도구인 FDR을 사용하여 RADIUS 프로토콜의 안전성을 분석하고자 하였다.