• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.9
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• pp.120-125
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• 2016

For the purpose of protecting personal property and lives from incidents, accidents, and threats such as terrorism, video surveillance equipment has been installed and operates in many places. Video surveillance technology has gradually developed into high-quality, high-definition equipment, and a lot of products have been launched. However, closed circuit television (CCTV) equipment for security purposes can invade a person's privacy. In this paper, we propose a way to protect personal video images using meta-data in an intelligent Internet protocol (IP) camera. We designed the system to mask personal video information from meta-data, define the method of image-information access according to user privileges, and show how to utilize the meta-data during storage and recorded data searches. The suggested system complies with guidelines for CCTV installation and operation from Korea's Ministry of the Interior. Installed on only a single server so far, due to the limitations and technical difficulties of hardware performance, it has been difficult to find a method that can be applied to personal image information using real-time protection techniques. Applying the method proposed in this paper can satisfy the guidelines, reduce server costs, and reduce system complexity.

• 전기의세계
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• v.42 no.4
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• pp.45-52
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• 1993

일반적으로 케이블 계통은 최고허용온도 부근에서 상시운전하는 경우는 거의 없다. 즉, 허용전류 계산시에도 충분한 여유가 있는 가정들을 근거로 계산하므로 허용전류 자체에 충분한 여유가 있을 뿐만 아니라 설계단계에서도 향후 부하의 증가를 고려하여 설계하므로 설계용량 부근에서 상시운전하는 경우는 거의 없다. 동태용량 산정기법은 가상부하에 따른 도체 및 유도의 예측, 열특성 파라메타의 변화에 따른 허용전류의 예측이 가능하며 특히 케이블의 과도특성을 이용하여 단시간의 허용전류를 상당히 증대(외국의 경우 정태용랴의 약2배)시킬 수 있는 장점이 있다. 따라서 정태용량 산정에 의한 설계 여유 및 운전중에 조건의 변화에 따른 허용전류의 여유를 예측 할 수 있는 동태용량 산정법은 케이블 부하조정의 융통성 뿐 만 아니라 케이블계통 사고시에도 적절히 대처할 수 있는 많은 융통성을 제공해 주게 된다. 아울러 동태용량 프로그램이 절연체의 수명손시평가법과 함께 해석된다면 케이블계통의 플렉시빌리티와 효율의 비약적인 증가를 가져올 뿐만 아니라 전체 계통의 신뢰도를 증가시킬 수 있는 장점등으로 인해 복잡한 도시에서 새로운 케이블 경과지 확보가 점점 어려워지는 추세에 따라 앞으로 동태용량 프로그램에 관한 연구개발이 활발해질 것으로 예견된다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.39 no.2
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• pp.112-119
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• 2003

제한수역에서 바람과 조류와 같은 외력을 받으며 항행하는 선박들 사이에는 대양에서 항행할 때와는 달리 상호간에 여러 가지 작용이 일어나면서 선박의 안전이 위협받는 수가 많다. 본 연구에서는 협수로와 같은 제한수역에서, 해난사고를 피하기 위해 요구되어지는 선박들간의 적절한 안전속도 및 안전거리를 제안하기 위해 선장비, 속도비, 풍향, 풍속, 유향 및 유속 등을 파라메타로 해서 조종운동 시뮬레이션 계산을 행하였다. 시뮬레이션 계산 결과, 두 선박 간의 상호 영향은 대형선박에 비해서 소형선박에 보다 크게 작용하는 것으로 나타났고, 속도비 1.2 의 경우가 속도비 0.6, 1.5의 경우보다 매우 크게 나타났다. 한편, 외력하에서 항행하는 두 선박에 있어서, 고속 선박에 비해서 저속 선박에 미치는 외력의 영향은 상당히 크게 작용하기 때문에 조선할 때, 이 점에 유의하여 항행해야 함을 알 수 있었다.

• The Journal of the Korea Contents Association
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• v.14 no.1
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• pp.158-164
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• 2014

This study has been started by the trendy analysis of parody in post-modern dance. Creative parody is not an imitative work but provides new originality of a work of art and serves as the criticism. Since the 1960s the trend and characteristics of using parody in post-modern dance can be classified into five concepts which are the cultural diversity, the autonomous thinking ability, the aesthetic perception, the use of the mass media and the cultural relations of the critical process. In conclusion, the parody elements in post-modern dance are due to the cultural diversity, and the experimental values which are divided into the beauty of content and mode has been acted as the important factors to achieve the parody elements to new dimension.

• Journal of the Korean School Mathematics Society
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• v.17 no.4
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• pp.657-677
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• 2014

The present qualitative case study explored the ways in which three middle school students constructed and refined their mathematical models and modeling processes, and factors that had influenced such refinement. The results suggest that students' modeling processes are non-sequential in that the participant students reformulated their initial problem from the real-world problem situation and revised the model when they could not get a satisfactory solution or the acquired solution did not make sense. Moreover, the students' model refinement processes were affected by the following four elements: the types of real-word problem situations, students' metacognitive thinking, communications between teachers and peers, and the role of teachers.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.3
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• pp.64-72
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• 2003

Comparing with transmission networks, the faults in distribution networks more often occurs because of the complicated structure and the adjacency to customers. Moreover the faults give direct damage to customers. So fault diagnosis and blackout restoration in distribution networks are very important elements to reduce the damage of customers and to maintain the stability. The restoration problem of distribution networks is subject to time. Minimizing the switching numbers in restoration process is the crucial element. In other words. the best restoration is to restore all blackout area through just one switching, if not the restoration has to be accomplished through several switching. This paper proposes the efficient restoration system in distribution networks to minimize the switching numbers. The proposed system uses the dynamic division method of hierarchical structure which consists of heuristic searching method and meta algorithm. The proposed system is applied to the sample networks, and the results showed a promising possibility.

• The Journal of Korean Association of Computer Education
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• v.9 no.6
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• pp.19-28
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• 2006

A programming language is very important subject in computer science. But it is difficult for many students to learn programming language. New pedagogical methods and techniques to help students to learn programming are needed. In this paper, we investigated the effects of Pair Programming, and we proposed a Pair programming strategy to improve programming skills. This paper examined the proposed Pair programming strategy. A empirical study showed the proposed teaching and learning strategy has positive effects on achievement and motivated strategies in programming course. Four factors - critical thinking, metacognitive reflection, effort regulation, and peer learning - have positive effects in learning strategies. The proposed Pair Programming strategy improves programming learning and motivated strategies.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.873-900
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• 2017

본 연구는 사회연결망 분석이론을 통해 원자력 과학기술에 대한 사회과학 연구의 경향적 특징을 파악하고, 동 분야의 주요 연구주제와 하부 연구분야를 도출하기 위해 수행되었다. 연구대상은 1957년부터 2016년까지 국내 학술지에 게재된 원자력 관련 사회과학 분야 연구논문 605건으로, 저자가 제시한 키워드 간 관계망 형성을 통해 네트워크 분석을 수행하였다. 분석결과, 첫째 국내에서 수행된 원자력 관련 사회과학 연구의 기술통계적 특징을 확인하였다. 원자력 사회과학 연구는 1957년부터 시작되어 꾸준히 수행되어졌는데, 2011년을 기점으로 논문발표가 급격히 증가했다. 주로 법학, 행정학, 정책학, 정치학의 연구가 대학 내 연구자를 중심으로 수행되어 왔다. 원자력 관련 기술개발이 주로 정부 출연연구기관에서 수행된다는 점을 고려 했을 때, 향후 사회과학 분야에 있어 대학과 출연기관 간의 역할분담이 필요하다. 둘째, 후쿠시마 원전사고가 발생한 2011년을 기점으로 사회과학의 원자력에 관한 연구가 양적, 질적으로 본격적으로 활성화 되었다. 원자력 관련 사회과학 지식 네트워크는 2011년 이전에 비해 규모면에서 큰 차이를 보였다. 또한, 네트워크 중심성 분석결과, 후쿠시마 사고 이전 사회과학 연구자들의 연구경향은 핵비확산, 과학기술 정책, 사회수용성이었다면, 후쿠시마 이후에는 원전해체, 손해배상, 에너지믹스, 탈핵운동 등과 같은 다양한 원자력 현안으로 확대되었다. 셋째, 하부 연구분야 도출을 통해 특정 연구주제별 쏠림현상을 확인했다. 하부 네트워크 분석 결과, 제시된 9개의 하부 연구분야는 네트워크 속성 값에서 차이를 보였다. 특히, 법학 관련 연구주제가 가장 높은 밀도를 갖는 반면 지속가능 발전과 에너지 믹스 관련 연구주제의 밀도가 가장 낮게 나타났다. 본 연구는 원자력에 관련된 학자의 인식을 연구경향 분석을 통해 파악한다는 점에서 의의가 있으며, 이는 추후 원자력 관련 정책연구자 혹은 정책결정자에게 유용한 기초자료를 제공할 것이라 기대된다.

• Journal of The Korean Association For Science Education
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• v.31 no.2
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• pp.225-238
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• 2011

The purpose of this study was to investigate the effects of the instruction with question-creation training, compared with traditional science instructions. The instruction with question-creation training is to give students chances to make questions by themselves based on what they learned before the end of the classes. The four effects of the instruction were studied: students' achievement, metacognition, self-efficacy, and the level of the questions created by the students according to different proficiency levels. Research data was gathered from 65 second grade students at a middle school in Busan. The comparative group was instructed in traditional lecture-type teaching method. The experimental group was instructed with questioncreation training. Students in the experimental group were asked to make 3 questions by themselves and then, to solve their peers' questions about 15 minutes before the end of the classes. Both groups were divided into 3 groups by proficiency level according to the results of last semester's science test. Before the research, a metacognition test and a self-efficacy test were conducted. After the research, an achievement test, a question level test, a metacognition test, and a self-efficacy test were conducted and analyzed by t-test. The research data for question level was analyzed by one-way ANCOVA. The results of this study revealed that question-creation training has a positive effect on student's achievement, metacognition, and self-efficiency. It also showed most of the students have gained an ability to make higher-level questions regardless of their proficiency level due to the increased number of students who made higher-level questions. It also showed that most of the students could gain an ability to make higher-level questions regardless of their proficiency level from the fact that the number of students who made higher-level questions increased in every proficiency level.

• Journal of Science Education
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• v.36 no.2
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• pp.251-262
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• 2012

In this study, we develop 15 learning programs to enhance the variable identification and control abilities for the middle school students and analyze the effect of the programs applied to the class. To increase the learning effect of the variable identification and control abilities, we design the programs so that the students can monitor their thinking processes and also they can evaluate the results from their cognitive activities objectively. We analyze the effect of the programs applied to the class and the results show that the test group, which uses the program, marks higher scores in the variable identification abilities compared to the control group. Also, the test group has the increased level of logic to control the variables. Especially, the effect is higher with the students who do not have any logic to control the variables. From the results, we know that it is possible to improve the variable identification and control abilities of the students through the meta-cognitive learning programs developed by us. Furthermore, the results show that the score of variable control abilities positively correlate with that of meta-cognitive level. It means that the meta-cognitive strategy meaningfully increases the variable control abilities of middle school students.