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( Ilhak Ban ),( Se-jin Kim ) 한국인터넷정보학회 2021 인터넷정보학회논문지 Vol.22 No.5
Small-cells in heterogeneous networks are one of the important technologies to increase the coverage and capacity in 5G cellular networks. However, due to the randomly arranged small-cells, co-tier and cross-tier interference increase, deteriorating the system performance of the network. In order to manage the interference, some channel management methods use fractional frequency reuse(FFR) that divides the cell coverage into the inner region(IR) and outer region(OR) based on the distance from the macro base station(MBS). However, since it is impossible to properly measure the distance in the method with FFR, we propose a new interference aware FFR(IA-FFR) method to enhance the system performance. That is, the proposed IA-FFR method divides the MUEs and SBSs into the IR and OR groups based on the signal to interference plus noise ratio(SINR) of macro user equipments(MUEs) and received signals strength of small-cell base stations(SBSs) from the MBS, respectively, and then dynamically assigns subchannels to MUEs and small-cell user equipments. As a result, the proposed IA-FFR method outperforms other methods in terms of the system capacity and outage probability.
Dynamic User Association based on Fractional Frequency Reuse
Ban, Ilhak,Kim, Se-Jin The Basic Science Institute Chosun University 2020 조선자연과학논문집 Vol.13 No.1
This paper proposes a novel fractional frequency reuse(FFR) based on dynamic user distribution. In the FFR, a macro cell is divided into two regions, i.e., the inner region(IR) and outer region(OR). The criterion for dividing the IR and OR is the distance ratio of the radius. However, these distance-based criteria are uncertain in measuring user performance. This is because there are various attenuation phenomena such as shadowing and wall penetration as well as path loss. Therefore, we propose a novel FFR based on dynamic user classification with signal to interference plus noise ratio(SINR) of macro users and classify the FFR into two regions newly. Simulation results show that the proposed scheme has better performance than the conventional FFR in terms of SINR and throughput of macro cell users.
이일학(Ilhak Lee) 국가생명윤리정책원 2017 생명, 윤리와 정책 Vol.1 No.2
국가생명윤리심의위원회는 생명과학연구 분야의 거버넌스 일환으로 「생명윤리 및 안전에 관한 법률」에 의거하여 운영되고 있다. 법률 규정상 생명과학 연구 외에도 위원회의 판단에 의해 심의 대상을 결정할 수 있으나, 지금까지 국가생명윤리심의위원회는 배아연구, 유전자관련 연구의 허용 여부 결정이 주된 기능이었다. 법률의 규정이 구체적인 상황에서 국가생명윤리심의위원회의 심의 기능은 축소되었고 현재 국가생명윤리심의위원회는, 논쟁의 여지가 있으나, 그 기능이 축소된 상황이다. 본 논문은 국가생명윤리심의위원회의 기능이 구체적인 사안을 심의하는 데서 다양한 가능성을 검토, 최선의 대안을 탐색하는 한편 이 과정에서 시민의 참여를 보장하는 것으로 옮겨져야 한다고 주장한다. 이를 위해 현행 「생명윤리 및 안전에 관한 법률」의 규정과 외국의 국가생명윤리위원회 제도를 검토하여 현재 우리 체계를 다른 시각에서 살펴보았다. 우리 사회가 생명과학기술을 받아들이는 윤리적 규범이 변화함에 따라 국가생명윤리심의위원회의 목표와 기능에 변화가 필요함을 발견할 것이다. 그 방향성으로 미국 대통령직속 생명윤리자문위원회가 추구했던 시민의 참여를 통한 윤리적 결정-‘공적 숙고(public deliberation)’-의 내용과 실현방안을 검토했다. 국가생명윤리심의위원회는 첨단 연구와 관련된 ‘생명윤리전문가’의 원탁이 아니라 공론장을 마련하고 보존하는 수호자 역할을 수행해야 할 것이다. 마지막으로 앞으로 국가생명윤리심의위원회가 수행해야 할 활동의 주제를 제안하였다. Korean National Bioethics Committee (KNBC) is deliberating body with functions designated by Bioethics and Safety Act (2013). After 10 years of its establishment, it is necessary to review its achievement and how it can serve the society in safeguarding the sound ethical judgement and practice in biomedical researches. Considering the nature of ethical governance, KNBC worked successfully in institutionalising bioethical consideration into research practice. KNBS worked through deciding the permissible topics in genetic and embryonic researches, about which there existed conflict. Since the ecosystem of ethical oversight has been changed, in which foundational, clinical, and public bioethics body(Evans, 2006) collaborate, KNBC should transform its function and structure to adapt the changes. Considering the nature of bioethical conflicts and pluralistic society, the ideal and practice of bioethics should take into account of deliberative democracy. To explore this possibility, this article review the functions and status of current KNBC and the European national bioethics committees. And the proposal for transformation is given.
고밀도 이기종 네트워크에서 매크로셀 사용자 성능 향샹을 위한 스몰셀 기반 다중점 협력통신
반일학 ( Ilhak Ban ),김세진 ( Se-jin Kim ) 한국인터넷정보학회 2021 인터넷정보학회논문지 Vol.22 No.6
고밀도 이기종 네트워크에서 스몰셀 기지국(Small-cell base station, SBS)의 수가 증가하면 매크로 단말(Macrocell user equipment, MUE)의 간섭량도 증가하여 수신 신호대 간섭 및 잡음비(Signal-to-interference and noise ratio, SINR)와 시스템 용량이 감소한다. 따라서, 본 논문에서는 SBS의 수가 증가하여도 MUE의 성능을 보장하기 위한 스몰셀 기반 다중점 협력통신(Cooperative Multi-Point, CoMP) 방법을 제안한다. 제안하는 방법은 MUE가 주어진 SINR 임계값을 만족하기 위해 주변에 위치한 SBS들을 선택하고, 선택된 SBS는 MUE에게 CoMP를 제공하여 성능을 향상시킨다. 시뮬레이션 결과를 통해 제안하는 스몰셀 기반 CoMP 방법이 다른 간섭관리 및 CoMP 방법과 비교해 스몰셀 단말의 성능은 크게 감소되지 않으면서 MUE의 평균 SINR과 시스템 용량이 향상됨을 보인다. In ultra-dense heterogeneous networks, the amount of interference from small-cell base stations(SBS) to macro-cell user equipments (MUEs) increases significantly as the number of SBSs increases and it causes the MUEs to decrease the signal-to-interference and noise ratio(SINR) and system capacity. In this paper, we propose a small-cell based cooperative multi-point(CoMP) communication scheme that can guarantee the performance of MUEs even when the number of SBSs increases. In the proposed scheme, MUEs first find SBSs that give signal strength equal to or greater than a given SINR threshold and then they are served by different numbers of the selected SBSs using CoMP to improve the performance of MUEs. Simulation results show that the proposed small-cell based CoMP scheme outperforms other interference management or CoMP schemes in terms of the SINR and system capacity of MUEs.
Ban, Ilhak,Jo, Seonghun,Park, Haneum,Um, Junho,Kim, Se-Jin The Basic Science Institute Chosun University 2018 조선자연과학논문집 Vol.11 No.3
In this paper, we propose a hybrid-recognition system to obtain the state information and control the Internet of Things (IoT) based smart devices using two recognitions. First, we use a facial recognition for checking the owner of the mobile devices, i.e., smartphones, tablet PCs, and so on, and obtaining the state information of the IoT based smart devices, i.e., smart cars, smart appliance, and so on, and then we use a fingerprint recognition to control them. Further, in the conventional system, the message of the state and control information between the mobile devices and smart devices is only exchanged through the cellar mobile network. Thus, we also propose a direct communication to reduce the total transmission time. In addition, we develop a testbed of the proposed system using smartphones, desktop computers, and Arduino vehicle as one of the smart devices. We evaluate the total transmission time between the conventional and direct communications and show that the direct communication with the proposed system has better performance.