• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1063-1070
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• 2015

In this paper, we propose a distributed user scheduling with transmit power control based on the amount of generating interference to other base stations (BSs) in multi-cell multi-input multi-output (MIMO) networks. Assuming that the time-division duplexing (TDD) system is used, the interference channel from users to other cell BSs is obtained at each user. In the proposed scheduling, each user first generates a transmit beamforming vector by using singular value decompositon (SVD) over MIMO channels and reduces the transmit power if its generating interference to other BSs is larger than a predetermined threshold. Each BS selects the user with the largest effective channel gains among users, which reflects the adjusted power of users. Simulation results show that the proposed technique significantly outperforms the existing user scheduling algorithms.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.37-39
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• 2015

In this paper, we propose a distributed user scheduling with interference-aware power control (IAPC) to maximize signal to generating interference plus noise ratio (SGINR) in multi-cell uplink network. Assuming that the channel reciprocity time-division duplexing (TDD) system is used, the interference channel from users to other cell BSs is obtained at each user. In the proposed scheduling, each user reduces the transmit power if its generating interference to other BSs is larger than a predetermined threshold. Each BS selects the user with the largest SGINR among users. Simulation results show that the proposed technique significantly outperform the existing user scheduling algorithms.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.11
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• pp.2607-2612
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• 2014

In this paper, we propose a distributed user scheduling with transmit power control based on the amount of interference inflicted to other BSs in multi-cell uplink networks. Assuming that the channel reciprocity time-division duplexing(TDD) system is used, the channel state information (CSI) can be obtained at each user from pilot signals from other BSs. The amount of generating interference to other BSs will be calculated at each user. Especially, in this paper, we propose the threshold-based transmit power control, in which a user decrease its transmit power if its generating interference to other BSs is larger than a predetermined threshold. Simulation results show that the proposed technique significantly outperforms the existing user scheduling algorithms.

• Journal of Digital Contents Society
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• v.18 no.4
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• pp.671-679
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• 2017

According to studies of many language education researchers including R. Ellis, a representative English education specialist, it is an effective and important method to improve the authenticity of English by learning a foreign language repeatedly in learner's actual situation. In this paper, we propose a foreign language learning service combined with context-awareness service, and develop foreign language learning contents which improves the authenticity of English learning based on the service. This approach is based on a study on digital education contents that helps learners to acquire a foreign language in an unconscious state in their real environment and a study to analyze the empirical characteristics of users based on real-time multi-sensed data.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5486-5492
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• 2011

This paper presents a model of ubiquitous learning environment system based on the concepts of ubiquitous computing technology that enables learning to take place anywhere at anytime. This ubiquitous learning environment is described as an environment-friendly learning scheme that supports students' learning using digital media in geographically distributed environments. The u-learning model is a web-based e-learning system that could enable learners to acquire knowledge and skills through interaction between them and the ubiquitous learning environment. Education is happening all around the student but the student may not even be conscious of the learning process. Source data is present in the embedded objects and students do not have to do anything in order to learn. The communication between devices and the embedded computers in the environment allows learners to learn in an environment of their interest while they are moving, hence, attaching them to their learning environment.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.3
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• pp.592-599
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• 2007

The advancement of wireless technology improves the electronic learning by combining with the mobile function, and promotes the expanded transition to the mobile learning. Basically, the mobile learning provides the usefulness in terms of tile and space to provide learners with the access to the educational contents. However, the small display device and limited memory space of mobile device is limiting the access to the learning contents simply to the text-based transmission. This paper designed and implemented the multimedia mobile learning system that reduces the size of parser by define into MSMIL composed only of needed tag to multimedia contents production in the mobile devices by using the SMIL that supports the multimedia object synchronization reduces the data of multimedia learning data and enhances the transmission efficiency by applying the macro method in creating the contents of learning. The results of implementation indicates that it simplifies the designing language, makes the language learning easy, and saves the CPU resources for the parsing by reducing the size of parser.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.10
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• pp.1204-1211
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• 2012

Measurement and analysis results of the extracted radiation-patterns from the field-experiments which were conducted to acquire the generic technology for calibration and validation of the satellite SAR system(Synthetic Aperture Radar) are presented in this study. Prototype of active transponder is adjustable within maximum 63.1 dBsm of RCS (Radar Cross Section) and includes the receiving-function with external receiver. To increase an accuracy of these field experiments, we repetitively measured satellite SAR systems of the same operating mode(i.e., COSMO-SkyMed No. 2 & 3, hh-pol., strip-map himage mode, 3 m resolution). Then, the reliability of experimental results was cross-checked through analysis of the RCS of active transponder on SAR image. The property of azimuth radiation patterns of satellite SAR system extracted from them has $0.352^{\circ}$ of HPBW(half-power beamwidth), $0.691^{\circ}$ of FNBW(first-null beamwidth), and 11.17 dB of PSLR(peak to side lobe ratio), respectively.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.774-777
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• 2017

의생명과학분야가 계속 발전됨에 따라 매일 평균 3천여 편에 달하는 방대한 양의 의생명과학분야 문헌들이 나오고 있다. 많은 연구가 진행될수록, 새로이 규명된 관계를 습득하고 체계화하는 일이 연구자와 의료계 종사자들에게 더 중요해지고 있다. 하지만 현재로서는 의생명과학분야에 어느 정도의 지식이 있는 사람이 직접 논문을 읽고 해당 논문에서 밝히고 있는 정보를 정리해야만 하는 상황이며, 이로는 기하급수적으로 쌓이는 정보의 양을 대처하기 어렵다. 이를 해결하기 위해 본 논문에서는 기계 학습을 통한 생명의료 객체관계 자동추출 연구를 이용하여 의생명과학분야의 정보를 체계화 하고자 한다. 본 논문에서는 돌연변이와 약물이 함께 등장하는 논문을 뽑아내어 글을 자연어 문장 단위로 나누었다. 추출한 돌연변이와 약물 간의 관계를 직접 사람에 의해 참거짓을 판명하였고, 해당 데이터셋을 기계학습에 이용하여 돌연변이와 약물 간의 관계를 학습시켰다. 최종적으로 GoogleNews의 기사들로 기학습된 워드임베딩, 의생명과학분야 문헌들을 이용하여 기학습된 워드임베딩을 이용하여 학습의 성능을 비교하였고, 의생명과학-문맥 특이적인 워드임베딩이 갖는 강점을 보고한다. 해당 연구를 통해 실제로 논문을 읽지 않고도 의생명과학분야 논문의 핵심적인 내용을 뽑아내는 자동화 시스템을 구축하는 데에 이바지하고, 의생명공학 연구자들의 연구에 핵심적인 도움이 되는 디딤돌이 되고자 한다.

• Journal of Korean Library and Information Science Society
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• v.48 no.4
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• pp.401-428
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• 2017

Counseling records can be used as a tool to identify the function of a counselor and to identify the client's status and will be able to expand functions as research data of academic and social culture. This study aims to investigate current status of management of records and archives on counselling youth and proposes a improved method to manage records and archives in Korea Youth Counseling & Welfare Institute. For this purpose, we performed interviews with the persons who have a role in managing records and archives. Based on the results, we proposed a method to improve problems. Especially, the proposals are considered in two sides administrative and systematic viewpoint.

• Journal of The Korean Association of Information Education
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• v.18 no.2
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• pp.243-254
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• 2014

We need problem solving abilities based on the information abilities in information-oriented society. New curriculum is demanded by new technology and circumstance to need the core competencies. Korea Association of Information Education has studied new curriculum and suggested new plans that contents of information education classified by 'Software', 'Computer System' and 'Convergence Activities.' Therefore, we studied on 'Problem Solving' topic of the 'Software' section of first grade to ninth grade. In this paper we firstly categorized 'Problem Solving' as 'Problem Comprehension and Analysis', 'Data Management', 'Strategy Establishment for Problem Solving', 'Problem Solving Method Seeking and Development' and 'Examination of Problem Solving Method.' We nextly suggested the achievement goals, teaching-learning methods and evaluation methods of 'Problem Solving' topic. We expect that the achievement goals and teaching-learning methods we suggested about 'Problem Solving' topic will contribute to training talented individuals.