• ETRI Journal
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• 제39권3호
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• pp.364-372
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• 2017

For the reliability of controllers in a software defined network (SDN), a dynamic and self-learning schedule method (DSL) is proposed. This method is original and easy to deploy, and optimizes the combination of multiple controllers. First, we summarize multiple controllers' combinations and schedule problems in an SDN and analyze its reliability. Then, we introduce the architecture of the schedule method and evaluate multi-controller reliability, the DSL method, and its optimized solution. By continually and statistically learning the information about controller reliability, this method treats it as a metric to schedule controllers. Finally, we compare and test the method using a given testing scenario based on an SDN network simulator. The experiment results show that the DSL method can significantly improve the total reliability of an SDN compared with a random schedule, and the proposed optimization algorithm has higher efficiency than an exhaustive search.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.936-941
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• 2005

KORAIL Human Resources Development Center' educational system is changed according to new start KORAIL. So, New master plan for will perform new vision POWER KORAIL 2010 is presented. 'C' Learning, 'W' Learning and 'E' Learning form the basis of these new methods and their principles have been applied ever since. These three independent yet interconnected learning axis were formed in order to achieve balance and harmony, realized in an integrated educational community. This model of education has become the foundation of our educational ideal at KORAIL's HRD Center. Innovative thinking and diligent scrutiny of educational applications and methods at the KORAIL HRD Center will bring about winning 'the war for talent'.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 춘계학술발표대회
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• pp.230-232
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• 2023

Federated Learning (FL) is a technique that excels in training a global model using numerous clients while only sharing the parameters of their local models, which were trained on their private training datasets. As a result, clients can obtain a high-performing deep learning (DL) model without having to disclose their private data. This setup is based on the understanding that all clients share the common goal of developing a global model with high accuracy. However, recent studies indicate that the security of gradient sharing may not be as reliable as previously thought. This paper introduces the latest research on various attacks that threaten the privacy of federated learning.

• 동의신경정신과학회지
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• 제24권2호
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• pp.145-154
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• 2013

Objectives : The purpose of this study is to examine the effects of treatment with scalp acupunctures for children with learning disorders. Methods : For this study, we evaluated Korea standard progressive matrices test (K-SPM) on 24 children with learning disorders who visited Korean medical center neuropsychiatry outpatient clinic from July 2012 to January 2013. Scalp acupuncture, cognitive enhancement therapy and speech-language therapy were applied. All children were treated 2 times a week for 4 months and we compared K-SPM test scores before treatment and 30 times after the treatment. Results : 1) After the treatment, K-SPM test scores have increased significantly (p<0.05) and the number of children in grade 5 (<5%) have decreased from 14 to 6. 2) Comparing K-SPM test scores between two groups: one with medical history and the other without medical history, the scores in both groups have increased significantly (p<0.05). 3) We also divided the children into two groups according to age: under the age of 13 and over the age of 13, and compared K-SPM test scores. Although the scores in both groups have increased respectively, it is the scores of the former group (under the age of 13) that have increased significantly (p<0.05). Conclusions : The treatments with scalp acupunctures were shown to be an effective intervention when improving K-SPM test scores of children with learning disorders.

• 한국환경생태학회지
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• 제32권3호
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• pp.332-341
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• 2018

본 연구는 2018년에 개장될 대구광역시 달성습지 생태학습관의 가치적 이용 및 경쟁력 있는 운영을 위해 달성습지 생태학습관의 특성에 맞는 운영방안을 제시하는 것이 목적이다. 이를 위해, 운영방법, 자원봉사자, 예산 및 수익 등 22개의 설문항목을 이용해 전국 77개 생태학습기관 담당자를 대상으로 설문조사를 실시하였다. 그 중 50개 생태학습기관(Type A)에서 응답을 하였으며, 그 중 달성습지 생태학습관과 비슷한 규모의 12개 생태학습기관(Type B)을 추출하여 추가 분석을 실시하였다. 설문에 대한 결과로 달성습지 생태학습관은 대구광역시에서 직접 운영을 하는 것이 적합하며, 최소 3-5명의 운영인력이 필요한 것으로 조사되었다. 정기적으로 활동하는 자원봉사자는 25-30명 내외의 인원이 필요하다. 인건비를 제외한 연간 운영 예산을 분석한 결과 대구광역시에 의해 직접운영 될 경우, 1억 5천만원 이상 2억원 미만이 필요하다. 본 연구는 국내 생태학습관 담당자를 대상으로 한 설문조사를 바탕으로 달성습지 생태학습관에 대해 객관적이며 상세한 운영방안을 수립할 기초자료를 마련했다는데 의의가 있다.

• PNF and Movement
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• 제12권2호
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• pp.81-88
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• 2014

Purpose: The purpose of this study is to examine the needs of prior field learning and the academic achievement of field experience learning in a college. Methods: This study was performed from May 1 to October 30, and students were given questionnaire. The research questionnaire as follows: (1) to investigate the academic achievement after field experience learning, (2) to verify the needs of field experience learning. A statistical analysis was performed using SPSS 17.0 for window version. Results: The results was as follows : First, satisfaction of field learning had scored good(47.2%) in lesson goal, good(51.8%) in acquisition of knowledge and techniques, good(51.0%) in preparation of study and good(45.9%) in association. Second, curriculum of field learning had scored normal(35.5%) in prior education, good(47.4%) in composition, good(50.8%) in guidance and good(47.2%) in contents. Third, curriculum of field learning had scored good(44.6%) in duration, good(46.1%) in numbers, good(51.3%) in convenience and normal(38.1%) in means of transportation. Forth, needs of field learning had scored good(46.6%) in field learning of practicum, good(48.2%) in field learning of theory subject, 3-4 times(42.0%) in frequency of field learning and 2hours(57.3%) in a field learning hour. Conclusion: These findings suggest that college student's thinking of field experience learning is positive. Field experience learning provided that college students have directly an opportunity of gaining valuable experience to feel the field.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.830-835
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• 1993

The errors in machining process by CNC machining center are due to many elements, such as the delay of the servo drivers, friction and the gain mismatch between x-axis and y-axis motors and so on. We made a counter circuit to measure the output of motor encoders for the motion error analysis of a CNC machining center, and have measured the errors experimentally when the CNC performs a circular interpolation. We have also used an iterative learning method to reduce the radius errors and stick motion errors generated by the CNC machining center performing a circular interpolation. The proposed learning scheme worked well and the circle obtained has smaller error.

• 공학교육연구
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• 제20권6호
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• pp.3-11
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• 2017

The purpose of this study is to investigate the variables that learners should consider for learning persistence when applying blended learning to mathematics class which is a basic curriculum of engineering college. For this purpose, this study compared the basic mathematics class with the blended learning and the class without it. In addition, this study analyzed the influence of the learning outcomes of the blended learning on the willingness to learning persistence by using the self-efficacy and self-regulated learning variables that can predict it. As a result, it was found that the blended learning applied mathematics class of K university which is the subject of analysis in this study has higher self - efficacy, self - regulated learning, and learning persistence intention than general classroom. Finally, the results of this study are meaningful to provide the points to be considered for improving the learning performance when applying the blended learning to the subject class in the future.

• 한국프랜차이즈경영연구
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• 제5권1호
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• pp.49-64
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• 2014

본 연구는 대표 눈높이 러닝센터의 사업화 사례 분석을 통해 교육 서비스 프랜차이즈 기업의 자기주도 학습관 사업화에 대한 개념을 정립하는데 목적이 있다. 대교 눈높이 러닝센터는 자기주도 학습관과 관련된 프랜차이즈 사업화의 선두주자로 해당 산업 내에서 이러한 성공을 이끈 경영방식을 유지하고 있다.대교가 성공적으로 러닝센터 사업화를 이룰 수 있던 것은 목표관리, 학습관리, 그리고 환경관리 등의 3가지 요인을 기반으로 한 교육서비스를 제공하고 있기 때문이다. 첫째, 대교는 목표관리로 꿈과 학습목표 및 학습실천 계획을 세우고 실천할 수 있는 분위기를 조성함으로써 자기주도적 태도를 형성하는데 도움을 준다. 또한, 대교는 학습 성향검사를 통한 효율적인 학습방법을 탐색하고 도모하게 할 수 있는 정보를 제공한다. 그리고 대교는 지속적인 학습 동기부여를 위한 다양한 행사를 실시하고 있다. 둘째는 학습관리로서, 대교는 30여 년 노하우의 눈높이 교재를 통한 체계적인 기초학력을 정착하는데 도움을 주고, 학습자 중심의 개인별 맞춤 솔루션 제공 및 정확한 진도를 관리하며, 출결시스템을 통한 학습시간 관리 및 1:1 학습지도를 통한 학습실천 관리를 제공한다. 셋째는 환경관리로서, 대교는 이를 위해 과목별 담당교사 및 집중력 있는 시설을 통해 자기주도 학습을 위한 공부환경을 조성해주고, 멀티미디어 시스템을 통한 LAB학습, 동영상 학습을 통한 다양하고 재미있는 공부공간을 제공해준다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권9호
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• pp.4593-4595
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• 2012

Introduction: Mobile learning enables users to interact with educational resources while in variable locations. Medical students in residency positions need to assimilate considerable knowledge besides their practical training and we therefore aimed to evaluate the impact of using short message service via cell phone as a learning tool in residents of Obstetrics and Gynecology in our hospital. Methods: We sent short messages including data about breast cancer to the cell phones of 25 residents of gynecology and obstetrics and asked them to study a well-designed booklet containing another set of information about the disease in the same period. The rate of learning derived from the two methods was compared by pre- and post-tests and self-satisfaction assessed by a relevant questionnaire at the end of the program. Results: The mobile learning method had a significantly better effect on learning and created more interest in the subject. Conclusion: Learning via receiving SMS can be an effective and appealing method of knowledge acquisition in higher levels of education.