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- 저자 : Eun-Chan Park(박은찬) (검색결과 39 건)
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일제강점기 미션스쿨 계성학교의 운영에 대한 학생들의 비판적 인식과 활동
박은찬 ( Park Eun-chan ) 역사교육학회 2018 역사교육논집 Vol.66 No.-
This study looked into the students’ critical perception and activities in the operation of mission schools during the Japanese occupation period based on the examination of Keisung School. Students from Keisung School led the March First Independence Movement of Daegu and continued the anti-Japanese movement afterwards. In addition, they opposed the missionaries’ school operation policy through the movement to weed out the teaching staff on the missionary’s side, and actively developed the movement to raise their school to the status of a designated school through allied strikes; finally, making their school one of the few designated schools in the nation. Recent studies on mission schools have paid attention to students rather than the missionaries themselves. This study also examined students and their activities in connection with specific incidents and subsequent situations comprehensively. Particularly, it examined in detail, articles from the Dong-A Ilbo, the Chosun Ilbo and other newspapers published at that time, investigating their allied strikes and the movement to weed out teaching staff, which have not been covered profoundly in the Centennial History of Keisung and other studies. To begin with, this study examined the missionaries’ selection of miscellaneous schools as a result of the Revised Private School Norms and the effect of the March First Independence Movement on the students’ perception of the present situations and their organized activities afterwards. Starting from the independence movement, their critical perception became clear and their conscious resistance became more organized. This served as a driving force that led students from Keisung School to resist the Japanese through the movement to close up stores and the Hyeseongdan Group. Their conscious resistance continued into allied strikes. They expressed their willingness through allied strikes, and went on strike for the improvement of lessons, the replacement of equipment and the weeding out of teaching staff. The movement to weed out the teaching staff resulted from the students’ resistance against the missionaries’ arbitrary operation of not only Keisung School but also the entire religious circles of Daegu. As a result of the movement, several teachers left school, and in the process, the students experienced fierce friction with the school because of their allied strikes. The March First Independence Movement led the Japanese to change its colonial policy from military colonial rule to cultural colonial rule. As a result of this, the system of designated schools was introduced. This system had the contradiction of causing imbalance between miscellaneous schools. Most mission schools of the North Presbyterian Church did not pay much attention to the system of designated schools. Henderson, the principal of Keisung School, said that Keisung School’s primary goal was to propagate religion and its secondary goal was education. He would maintain its status of a miscellaneous school. As those who graduated from miscellaneous schools were not allowed to enter advanced schools, the students officially began the movement to elevate their school to the status of a designated school even before the introduction of the designated school system. That is, their aspiration for high school was expressed in their allied strikes. In the course of the strikes, they were collectively expelled from school, and the school’s alumni and their parents also participated in the movement. Finally, thanks to their frequent allied strikes, their school was raised to the status of a designated school. The students of Keisung School expressed their demands regarding the operation of the school in direct actions. They resisted against the Japanese as seen from the March First Independence Movement and the Hyeseongdan Group. Furthermore, they endeavored to make their demands reflected in the operation of the school, which included the weeding out of the teaching staff and raising their school to the status of a designated school through allied strikes. All this indicates that they actively participated in the operation of the school with the perception that they are the subjects of education.
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박은찬 ( Eun-chan Park ),임민중 ( Minjoong Rim ) 한국인터넷정보학회 2011 인터넷정보학회논문지 Vol.12 No.4
본 논문은 전송 전력과 전송 범위가 서로 다른 이기종 무선 통신망이 경쟁 기반의 채널 접속 프로토콜을 사용하여 공존하는 경우 채널 공유의 형평성과 효율에 관해 분석한다. 먼저, 기존에 널리 사용되는 경쟁 기반의 채널 접속 메커니즘인 CSMA(Carrier Sensing Multiple Access) 프로토콜을 사용하여 채널을 공유하는 경우, 이기종 시스템간의 반송파 감지의 비대칭성과 간섭으로 인한 전송실패를 인지하지 못하는 이진 지수 백오프 메커니즘과 링크 적응 메커니즘에 의해 채널이 불공평하게 공유됨을 밝힌다. 다음으로, 공간 재사용성과 공평한 채널 공유를 동시에 보장할 수 있는 반송파 감지 문턱값의 조건을 유도하고, 통신망의 처리율에 관한 수학적인 모형을 수립하여 경쟁 윈도우와 전송 속도가 채널 공유의 형평성과 효율에 끼치는 영향을 분석한다. 마지막으로, 다양한 환경에서의 모의 실험을 수행하여 공평한 채널 공유를 위한 여러 가지 접근 방법의 채널공유 성능을 비교한다. This paper analyzes the fairness and efficiency of channel sharing when heterogeneous wireless networks that have different transmission power and/or coverage coexist with the contention-based channel access protocol. First, we show that the existing CSMA (carrier sensing multiple access) protocol, that is a prevailing contention-based mechanism, results in significant unfairness of channel access because of (1) the asymmetric capability of carrier sensing and (2) the blindness of binary exponential backoff and link adaptation mechanisms to the interference-driven transmission failures. Next, we derive the feasible region of carrier sensing thresholds that assures spatial reuse and fair channel sharing simultaneously. Moreover, we establish an analytical model for per-system throughput and investigate the effect of contention window size and transmission rate on the fairness and efficiency of channel sharing. Finally, we compare the performance of several approaches for fair channel sharing via simulations under various network configurations.
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TCP Acknowledgement Compression for Fairness Among Uplink TCP Flows in IEEE 802.11n WLANs
김민호,박은찬,김웅섭,Kim, Minho,Park, Eun-Chan,Kim, Woongsup Institute of Control 2013 제어·로봇·시스템학회 논문지 Vol.19 No.7
This paper deals with the problem of unfairness among uplink TCP (Transmission Control Protocol) flows associated with frame aggregation employed in IEEE 802.11n WLANs (Wireless Local Area Networks). When multiple stations have uplink TCP flows and transmit TCP data packets to an AP (Access Point), the AP has to compete for channel access with stations for the transmission of TCP ACK (acknowledgement) packets to the stations. Due to this contention-based channel access, TCP ACKs tend to be accumulated in the AP's downlink buffer. We show that the frame aggregation in the MAC (Medium Access Control) layer increases TCP ACK losses in the AP and leads to the serious unfair operation of TCP congestion control. To resolve this problem, we propose the TAC (TCP ACK Compression) mechanism operating at the top of the AP's interface queue. By exploiting the properties of cumulative TCP ACK and frame aggregation, TAC serves only the representative TCP ACK without serving redundant TCP ACKs. Therefore, TAC reduces queue occupancy and prevents ACK losses due to buffer overflow, which significantly contributes to fairness among uplink TCP flows. Also, TAC enhances the channel efficiency by not transmitting unnecessary TCP ACKs. The simulation results show that TAC tightly assures fairness under various network conditions while increasing the aggregate throughput, compared to the existing schemes.
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무선랜 기반 e-Healthcare 시스템에서의 의료용 트래픽의 서비스 품질 보장을 위한 채널 접속 차별화 방안
김영부(Young Boo Kim),박은찬(Eun-Chan Park) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.6
The IEEE 802.11e EDCA (Enhanced Distributed Channel Access) mechanism has been proposed to improve the QoS (Quality of Service) of various services in WLANs (Wireless Local Area Networks). By differentiating the channel access delay depending on ACs (Access Categories), this mechanism can provide the relative service differentiation among ACs. In this paper, we consider that WLAN is deployed in medical environments to transfer medical traffic and we reveal that the quality of the medical traffic (in particular, ECG signals) is significantly deteriorated even with the service differentiation by IEEE 802.11e EDCA. Also, we analyze the reason for performance degradation and show that IEEE 802.11e EDCA has difficulty in protecting the transmission opportunity of high-priority traffic against low-priority traffic. In order to assure medical-grade QoS, we firstly define the service priority of medical traffic based on their characteristics and requirements, and then we propose the enhanced channel access scheme, referred to as DIFF-CW. The proposed scheme differentiates CW (Contention Window) depending on the service priority and modifies the channel access procedure for low-priority traffic. The simulation results confirm that the DIFF-CW scheme not only assures the QoS of medical traffic but also improves the overall channel utilization.
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TCP Acknowledgement Compression for Fairness Among Uplink TCP Flows in IEEE 802.11n WLANs
Minho Kim(김민호),Eun-Chan Park(박은찬),Woongsup Kim(김웅섭) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.7
This paper deals with the problem of unfairness among uplink TCP (Transmission Control Protocol) flows associated with frame aggregation employed in IEEE 802.11n WLANs (Wireless Local Area Networks). When multiple stations have uplink TCP flows and transmit TCP data packets to an AP (Access Point), the AP has to compete for channel access with stations for the transmission of TCP ACK (acknowledgement) packets to the stations. Due to this contention-based channel access, TCP ACKs tend to be accumulated in the AP"s downlink buffer. We show that the frame aggregation in the MAC (Medium Access Control) layer increases TCP ACK losses in the AP and leads to the serious unfair operation of TCP congestion control. To resolve this problem, we propose the TAC (TCP ACK Compression) mechanism operating at the top of the AP"s interface queue. By exploiting the properties of cumulative TCP ACK and frame aggregation, TAC serves only the representative TCP ACK without serving redundant TCP ACKs. Therefore, TAC reduces queue occupancy and prevents ACK losses due to buffer overflow, which significantly contributes to fairness among uplink TCP flows. Also, TAC enhances the channel efficiency by not transmitting unnecessary TCP ACKs. The simulation results show that TAC tightly assures fairness under various network conditions while increasing the aggregate throughput, compared to the existing schemes.
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