• Journal of the Economic Geographical Society of Korea
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• v.10 no.2
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• pp.182-196
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• 2007

EU has pursued of the economic growth and the promotion of jobs by a free movement of workers. The free labour mobility brings a sustainable economic development through the creating jobs and the acquisition of a new knowledge and technology, but it also produces the geographical unequality of the movement of workers. And the enlargement of the EU redistributes geographically the flow of labour mobility. The flow of labour movement within EU changes to the structure of mobility that moves from the North to the North instead of the movement from the South to the North as an economic development in the South and an economic transformation to the service and hightech industry in the North. The mobility of unskilled workers has diminished, but the mobility of expert workers has increased. The flow of labour movement within EU has a structure hierarchic that the experts labour move from the North to the North, and the unskilled labour move from the South to the North and from the northern Africa to the South of Europe.

• Education of Primary School Mathematics
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• v.24 no.4
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• pp.203-216
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• 2021

Seeing the elapsed time as a quantity that can be measured is quite challenging for students while making students see it is also challenging for teachers. Tuning on these challenges, this article reports on what learning opportunities elementary teachers provide when they teach elapsed time focusing on quantitative objectification. I observed three mathematics classrooms where the elapsed time was taught by three elementary teachers and did a narrative analysis on the instructions. All three teachers utilized certain tools to support students access to the elapsed time as a quantity. They appropriated various quantitative attributes of the tool. In the case of the analog clock, one teacher tried to quantification the elapsed time with the number of minute hand's turning, while the other teacher indicated the distance of minute hand's moving. One teacher represented the elapsed time with the longitudinal attribute of the time band. Standing on the findings, the didactical implications of various attempts for quantitative objectification of the elapsed time implemented were discussed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.1-8
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• 2010

Wireless multimedia service through the access to mobile telephone network or data network is a vital part of contemporary life, and the demand for frequency spectrum for new services is expected to explode as the ubiquitous computing proliferate. Cognitive radio is a technology, which automatically recognizes and searches for temporally and spatially unused frequency spectrum, then actively determines the communication method, bandwidth, etc. according to the environment, thus utilizing the limited spectrum resources efficiently. In this paper, we investigate the effects of imperfect sensing, misdetection and false alarm, on the primary and secondary users' spectrum usage through the analysis of continuous time Markov Chain. We analyzed the effects of the parameters such as sensing error, offered load on the system performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.1
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• pp.38-40
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• 2014

In this paper, proposed method achieves delay reduction and throughput improvement by utilizing token-ring method in infrastructure network. Access Point gives token passing effect by successively transmitting ACK frame including a node's Association ID. Not only can this method considerably reduce time for medium access, but also improve throughput. Furthermore, AP offers more frequent medium access opportunity to node having highest data queue among nodes associated by AP. these method can evenly offer medium access opportunity according to Queue's volumes.

• School Mathematics
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• v.9 no.4
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• pp.467-486
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• 2007

In mathematical modeling activity modeling process is usually an iterative process. When model can not be solved, the model needs to be simplified by treating some variables as constants, or by ignoring some variables. On the other hand, when the results from the model are not precise enough, the model needs to be refined by considering additional conditions. In this study we investigate the role of spreadsheet model in model refinement and modeling process. In detail, we observed that by using spreadsheet model students can solve model which can not be solved in paper-pencil environment. And so they need not go back to model simplification process but continue model refinement. By transforming mathematical model to spreadsheet model, the students can predict or explain the real word situations directly without passing the mathematical conclusions step in modeling process.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.7A
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• pp.467-476
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• 2003

In this paper, we propose an efficient MAC scheduling algorithm for supporting Bluetooth scatternet operations. Our proposed algorithm improves overall performances of scatter mode［2, 3] and considers QoS requirements of each link of the bridge node of a scatternet. Scatter mode is based on time division scheduling and provides every links of a scatternet with fair service opportunities. However, since each Bluetooth devices has various traffic characteristics. fair allocation of service opportunities is not efficient and may cause extravagance of wireless resources. Therefore, we propose a new efficient inter-piconet scheduling algorithm compliant with the current Bluetooth specification［1］, and demonstrate its improved performances via computer simulations.

• KLA journal
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• v.44 no.1 s.338
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• pp.74-85
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• 2003

일본 정부는 지난 2002년 8월 2일 각료회의에서 ‘어린이 독서활동 추진에 관한 기본 계획’을 결정하였다. 이 기본 계획은 어린이가 자주적으로 독서활동을 할 수 있도록 그 환경을 정비한다는 관점에서, 2001년 12월에 의원입법되어 공포.시행된 ‘어린이 독서활동 추진에 관한 법률’의 규정에 따라, 정부가 수립하지 않으면 안 되게 된 것이다. 이 계획을 2002년부터 2006년까지 5년에 걸친 시책의 기본 방향과 구체적인 방안을 제시한 것으로, 그 개요는 다음과 같다. 1. 가정, 지역사회, 학교를 통하여 어린이가 독서와 친해질 수 있는 기회 제공 가정교육에 관한 학습기회를 통하여 부모에게 독서의 중요성을 이해시킨다. 도서관에서의 어린이 독서활동을 추진하여 민간단체 활동을 지원한다. 학교에서의 학습활동을 통하여 독서습관을 확립하고 독서활동을 추진한다. 2. 도서자료 정비 등 제반 조건의 정비 및 충실화 도서관과 공민관 도서실 등 지역사회의 독서환경을 정비한다. 도서관 자료를 정비하고 정보화를 추진하며 사서 연수를 충실화한다. 학교도서관의 도서정비 5개년 계획, 정보화 추진, 사서교사 발령을 촉진한다. 3. 학교, 도서관및 관계기관, 민간단체의 연계.협력체제 추진 4. 사회 분위기 조성을 위한 보급.계발 어린이 독서의 날(4월 23일)을 중심으로 전국적으로 홍보한다. 홈페이지 개설로 관련정보를 광범위하게 제공한다. 일본 문부과학성은 이 기본계획에 기초하여 관계부처 등과 긴밀히 협조하여 어린이 독서활동 추진에 관한 시책을 더욱 충실히 하기로 하였다. -편집자주

• Journal for History of Mathematics
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• v.25 no.1
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• pp.89-105
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• 2012

This study analyzed the lesson analysis reports and survey of pre-service teachers who have practiced the microteaching in order to identify the reflection of mathematics pre-service teachers. The professors who are teaching pre-service teachers need to propose the examples of an instructional model that can induce the opened reaction and the effective usage of time through interesting topics. In addition, pre-service teachers who have practiced the first microteaching have shown a lot of reflection more than expected. Therefore, to improve the quality of lectures, it is important for pre-service teachers to have experiences of microteaching and reflection.

• Journal of Engineering Education Research
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• v.7 no.1
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• pp.64-73
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• 2004

Universities have to offer efficient education through measuring and evaluating courses precisely. Course evaluation gives instructors a chance of understanding quality and issues arisen in courses, and students a chance of the effective learning. This study investigates general characteristics and administration method of course evaluation in engineering education. The investigation includes elements of course evaluation, various evaluation methods, effective administration methods, and validation of the evaluation. A survey was undertaken to the students at Myongji University regarding course evaluation. The study summarized the results of the survey.

• Journal of Gifted/Talented Education
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• v.11 no.2
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• pp.87-106
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• 2001

Identification and selection the mathematically gifted child must be based on it's definition. So, we have to consider not only IQ or high ability in mathematical problem solving, but also mathematical creativity and mathematical task commitment. Furthermore, we must relate our ideas with the programs to develop each student's hidden potential. This study is focused on the discrimination of the candidates who would like to enter the elementary school level mathematics gifted education program. To fulfill this purpose, I considered the criteria, principles, methods, and tools. Identification is not exactly separate from selection and education. So, it is important to have long-term vision and plan to identify the mathematically gifted students.