• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.1096-1099
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• 2007

무선LAN 환경에서는 대체로 AP(Access Point)의 신호세기 만으로 사용할 AP를 선택하므로, 모바일 노드 사용이 한 영역으로 집중되면 특정 AP에 혼잡이 초래되어 전체 네트워크의 사용 효율이 저하된다. 본 논문에서는 각 AP의 부하 정보를 이용해 핫스팟의 혼잡을 분산시키고 AP의 데이터 전송속도를 최대한 보장하는 AP 선택 정책을 제안하고 이를 응용하는 시스템을 구현하였다. 실측 데이터를 적용하여 시험한 결과, AP의 혼잡이 분산되고 네트워크 사용 효율이 기존 방식보다 우수함을 확인하였다.

• Journal of Industrial Technology
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• v.28 no.A
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• pp.105-111
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• 2008

A typical AP (Access Point) selection policy is to select an AP based on the received signal strength indicator (RSSI), ignoring its load. If multiple stations are deployed densely at a particular area, a typical AP selection policy will bring about the overall network throughput degradation. This paper proposes a novel AP selection policy taking into consideration not only signal strength of the APs but also AP loads to avoid Hotspot congestion. An experiment on Alinker implementing proposed AP selection policy, demonstrates that the proposed policy achieves close to optimal load balancing and grants the maximum transmission rate to stations in comparison with SSF (Strongest-Signal-First) and LLF (Least-Loaded-First).

• Journal of Gifted/Talented Education
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• v.26 no.2
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• pp.405-421
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• 2016

The purpose of this study was to investigate students' perception of Advanced Placement Program. Participations of this study were 1144 students from 14 science high schools. The results showed as follows. First, students perceived positively regarding AP program and were willing to take AP courses because of interesting and challenging in academic area which is provided by AP courses. Secondly, many students would like to take AP courses in Differential and Integral Calculus 1, General Physics I, General Chemistry I and General Biology. Also, they would like to take AP courses in first term as a mandatory subjects. Third, responses perceived that AP courses were challenging, difficult, and of high quality. Finally, students perceived the benefit of AP courses in earing college credit. However, 35% of responses wished to receive an exemption for all AP courses. Also, they wished to have dual-major or participate in students exchange program as a benefit of AP program. Implications of the study were discussed in depth based on the results.