• Title/Summary/Keyword: SBS 방법

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Small-cell Resource Partitioning Allocation for Machine-Type Communications in 5G HetNets (5G 이기종 네트워크 환경에서 머신타입통신을 위한 스몰셀 자원 분리 할당 방법)

  • Ilhak Ban;Se-Jin Kim
    • Journal of Internet Computing and Services
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    • v.24 no.5
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    • pp.1-7
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    • 2023
  • This paper proposes a small cell resource partitioning allocation method to solve interference to machine type communication devices (MTCD) and improve performance in 5G heterogeneous networks (HetNet) where macro base station (MBS) and many small cell base stations (SBS) are overlaid. In the 5G HetNet, since various types of MTCDs generate data traffic, the load on the MBS increases. Therefore, in order to reduce the MBS load, a cell range expansion (CRE) method is applied in which a bias value is added to the received signal strength from the SBS and MTCDs satisfying the condition is connected to the SBS. More MTCDs connecting to the SBS through the CRE will reduce the load on the MBS, but performance of MTCDs will degrade due to interference, so a method to solve this problem is needed. The proposed small cell resource partitioning allocation method allocates resources with less interference from the MBS to mitigate interference of MTCDs newly added in the SBS with CRE, and improve the overall MTCD performace using separating resources according to the performance of existing MTCDs in the SBS. Through simulation results, the proposed small cell resource partitioning allocation method shows performance improvement of 21% and 126% in MTCDs capacity connected to MBS and SBS respectively, compared to the existing resource allocation methods.

Successive Backward Sweep Method for Orbit Transfer Augmented with Homotopy Algorithm (호모토피 알고리즘을 이용한 Successive Backward Sweep 최적제어 알고리즘 설계 및 궤도전이 문제에의 적용)

  • Cho, Donghyurn;Kim, Seung Pil
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.7
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    • pp.620-628
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    • 2016
  • The homotopy algorithm provides a robust method for determining optimal control, in some cases the global minimum solution, as a continuation parameter is varied gradually to regulate the contributions of the nonlinear terms. In this paper, the Successive Backward Sweep (SBS) method, which is insensitive to initial guess, augmented with a homotopy algorithm is suggested. This approach is effective for highly nonlinear problems such as low-thrust trajectory optimization. Often, these highly nonlinear problems have multiple local minima. In this case, the SBS-homotopy method enables one to steadily seek a global minimum.

Coordinated Multi-Point Communications with Channel Selection for In-building Small-cell Networks (건물 내 스몰셀 네트워크에서 채널 선택 기반 다중점 협력통신)

  • Ban, Ilhak;Kim, Se-Jin
    • Journal of Internet Computing and Services
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    • v.23 no.5
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    • pp.9-15
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    • 2022
  • This paper proposes a coordinated multi-point communication (CoMP) method with channel selection to improve performance of a macro user equipment (MUE) in a dense small-cell network environment in a building located within coverage of a macro base station (MBS). In the proposed CoMP method, in order to improve the performance of the MUE located in the building, A small-cell base station (SBS) selects a channel with lower interference to the neighboring MUE and transmits appropriate signals to the MUE requiring CoMP. Simulation results show that the proposed CoMP method improves the performance of the MUE by up to 164% and 51%, respectivley, compared to a random channel allocation based traditional SBS network and CoMP method.

Edge Caching Strategy with User Mobility in Heterogeneous Cellular Network Environments (이종 셀룰러 네트워크 환경에서 사용자 이동성을 고려한 엣지 캐싱 기법)

  • Choi, Yoonjeong;Lim, Yujin
    • KIPS Transactions on Computer and Communication Systems
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    • v.11 no.2
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    • pp.43-50
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    • 2022
  • As the use of mobile data increases, the proportion of video content is increasing steeply. In order to solve problems that arise when mobile users receive data from geographically remote cloud servers, methods of caching data in advance to edge servers geographically close to the users are attracting lots of attention. In this paper, we present a caching policy that stores data on Small Cell Base Station(SBS) to effectively provide content files to mobile users by applying a delayed offloading scheme in a cellular network. The goal of the proposed policy is to minimize the size of data transmitted from Macro Base Station(MBS) because the delayed offloading scheme requires more cost than when downloaded from MBS than from SBS. The caching policy is proposed to determine the size of content file and which content file to be cached to SBS using the probability of mobile users' paths and the popularity of content files, and to replace content files in consideration of the overlapping coverage of SBS. In addition, through performance evaluation, it has been proven that the proposed policy reduces the size of data downloaded from MBS compared to other algorithms.

Evaluation on Laboratory Moisture Damage Characteristics of the Asphalt Mixtures using Indirect Tensile Test (간접인장시험을 이용한 아스팔트 혼합물의 실내 수분손상 특성 평가)

  • Hwang, Sung Do;Rhee, Suk Keun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.2D
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    • pp.243-248
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    • 2008
  • Moisture damage of asphalt pavements can usually occur because of the loss of adhesion and cohesion between the asphalt binder and aggregate in the asphalt mixture due to presence of water. And this is one of the causes that is effect on the main distress of asphalt pavement. The objective of this study is to find out moisture damage characteristics of asphalt pavement. Effects of this study changes of the material properties and resistance characteristics of moisture damage on the asphalt mixtures under various temperatures and repeated immersion using indirect tensile test and modify Lottman test were evaluated during this study. The asphalt mixtures were produced using straight asphalt binder, SBS modified asphalt binder and aggregates. The material properties (resilient modulus, indirect tensile strength, failure energy and $DCSE_f$) of the asphalt mixtures were generally decreased with increasing to moisture damage caused by the number of repeated immersion. The decrease ratios of material properties by repeated immersion on SBS modified asphalt mixtures were lower than those of straight asphalt mixtures at all three test temperatures. As a conclusion, current criterion for evaluation moisture damage of asphalt mixtures is difficult for using distinction standard because of the limited evaluation criterion with one time immersion and single material property. Based on this research, to evaluate long term moisture damage on asphalt mixtures, material property tests of various kinds with repeated immersion test are considered.

Small-cell based Cooperative Multi-Point Communications to Increase Macro-cell User Performance in Ultra-Dense Heterogeneous Networks (고밀도 이기종 네트워크에서 매크로셀 사용자 성능 향샹을 위한 스몰셀 기반 다중점 협력통신)

  • Ban, Ilhak;Kim, Se-Jin
    • Journal of Internet Computing and Services
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    • v.22 no.6
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    • pp.9-15
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    • 2021
  • 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.

Genetic Algorithm Based Feature Selection Method Development for Pattern Recognition (패턴 인식문제를 위한 유전자 알고리즘 기반 특징 선택 방법 개발)

  • Park Chang-Hyun;Kim Ho-Duck;Yang Hyun-Chang;Sim Kwee-Bo
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.4
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    • pp.466-471
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    • 2006
  • IAn important problem of pattern recognition is to extract or select feature set, which is included in the pre-processing stage. In order to extract feature set, Principal component analysis has been usually used and SFS(Sequential Forward Selection) and SBS(Sequential Backward Selection) have been used as a feature selection method. This paper applies genetic algorithm which is a popular method for nonlinear optimization problem to the feature selection problem. So, we call it Genetic Algorithm Feature Selection(GAFS) and this algorithm is compared to other methods in the performance aspect.

A recommendation algorithm which reflects tag and time information of social network (소셜 네트워크의 태그와 시간 정보를 반영한 추천 알고리즘)

  • Jo, Hyeon;Hong, Jong-Hyun;Choeh, Joon Yeon;Kim, Soung Hie
    • Journal of Internet Computing and Services
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    • v.14 no.2
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    • pp.15-24
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    • 2013
  • In recent years, the number of social network system has grown rapidly. Among them, social bookmarking system(SBS) is one of the most popular systems. SBS provides network platform which users can share and manage various types of online resources by using tags. In SBS, it can be possible to reflect tag and time in order to enhance the quality of personalized recommendation. In this paper, we proposed recommender system which reflect tag and time at weight generation and similarity calculation. Also we adapted proposed method to real dataset and the result of experiment showed that the our method offers better performance when such information is integrated.

Comparative study of surface modification on bond strength of polyetherketoneketone adhesively bonded to resins for temporary restoration (Polyetherketoneketone의 표면처리 방법에 따른 임시 보철물 제작용 레진과의 결합 강도 비교 연구)

  • Hong, Mun Gi;Shin, Soo-Yeon
    • Journal of Dental Rehabilitation and Applied Science
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    • v.36 no.1
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    • pp.1-11
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    • 2020
  • Purpose: The purpose was to compare shear bond strength (SBS) of three types of resin for temporary restoration to polyetherketoneketone (PEKK) depending on surface modification. Materials and Methods: Sixty disks made from PEKK were air-abraded with 110 ㎛ alumina particles (Cobra, Renfert GmbH, Hilzinge, Germany) and thirty specimens were divided into two groups each: PEKK without Visio.link (Bredent, Senden, Germany)(U) and with Visio.link (P). Resins for temporary restoration (polymethylmethacrylate; PMMA, polyethylmethacrylate; PEMA, bis-acryl composite resin) in the shape of a square with one side 3.2 mm were bonded to PEKK twenty respectively and classified into six groups (UM, UE, UC, PM, PE and PC). All specimens were stored in distilled water at 37℃ for 24 hours. SBS of each group was measured at a crosshead speed of 2 mm/min in universal testing machine. SBS was compared using one-way ANOVA and a Tukey HSD test (P = 0.05). Results: Group UM and group UE showed a significant difference in SBS with group UC (P < 0.05). Group PC showed a significant increase in SBS than group UC (P < 0.05). Conclusion: It is recommended to apply Visio.link to PEKK for adhering bis-acrylic composite resin, but not for PMMA and PEMA in clinical practice.

Improved Side-by-Side 3D Reconstruct Method Considering Interlaced Characteristic (격행주사 특성을 고려한 향상된 Side-by-Side 3D 영상 보간 기법)

  • Kim, Jisu;Jeong, Jechang
    • Journal of Broadcast Engineering
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    • v.19 no.6
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    • pp.789-797
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    • 2014
  • In general, the image of interlaced side-by-side (SBS) streams is not good because it goes through two reconstruction steps-de-interlacing and horizontal interpolation. Especially the accuracy of horizontal resolution is greatly deteriorated as processed de-interlacing value is used for reference of interpolated pixel at time of horizontal interpolation. To solve this problem, we propose an improved method considering interlaced SBS stream's characteristics. In this paper, we adopted two separate methods to transmitted line and blank line for using reliable information. The experimental result of the proposed method is better than the conventional algorithm in terms of subjective and objective image quality.