• Title, Summary, Keyword: Heterogeneous

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The Fatigue Behavior of Laser Weldment in Heterogeneous Materials (이종재료 레이저 용접부의 피로거동)

  • 권응관;오택열;곽대순;이종재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.759-764
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    • 1997
  • In this study, Fatigue behavior of laser weldment in heterogeneous materials was investigated. Fatigue strength test and fatigue crack propagation test were performed for specimens with laser weldment in heterogeneous materials, and hardness test was performed. From the fatigue strength test. it was observed that the difference of strength between heterogeneous materials had eflect on crack initiation position and fatigue limit. From the fatigue crack propagation test. it was observed that fatigue behavior of laser weldment in heterogeneous materials is different from that in same materials. The difference of strength between heterogeneous materials and laser weldment had effect on fatigue crack propagation rate.

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CSG-based Representation for Free-form Heterogeneous Object Modeling (임의 형상의 복합재 모델링을 위한 CSG 기반 표현)

  • Shin, K.H.;Lee, J.K.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.4
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    • pp.235-245
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    • 2006
  • This paper proposes a CSG-based representation scheme for heterogeneous objects including multi-material objects and Functionally Graded Materials (FGMs). In particular, this scheme focuses on the construction of complicated heterogeneous objects guaranteeing desired material continuities at all the interfaces. In order to create various types of heterogeneous primitives, we first describe methods for specifying material composition functions such as geometry-independent, geometry-dependent functions. Constructive Material Composition (CMC) and corresponding heterogeneous Boolean Operators (e.g. material union, difference, intersection. and partition) are then proposed to illustrate how material continuities are dealt with. Finally, we describe the model hierarchy and data structure for computer representation. Even though the proposed scheme alone is sufficient for modeling all sorts of heterogeneous objects, the proposed scheme adopts a hybrid representation between CSG and decomposition. That is because hybrid representation can avoid the unnecessary growth of binary trees.

Data-centric Sensor Middleware for Heterogeneous Sensor Networks (이기종 센서 네트워크를 위한 데이터 중심적 센서 미들웨어)

  • Nam, Choon-Sung;Shin, Dong-Ryeol
    • IEMEK Journal of Embedded Systems and Applications
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    • v.7 no.6
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    • pp.323-330
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    • 2012
  • Wireless sensor networks need middleware system for efficiently managing the constrained resource and sensing data because they need different sensing data type and protocol to communicate with heterogeneous sensor networks. Thus this paper proposes data-centric sensor middleware for heterogeneous sensor networks. The proposed middleware have to support various query processing of user applications, high-level request of users, manage heterogeneous sensor systems and universal sensing data type for node and user application.

Analysis on Interference Control in Heterogeneous Networks (이기종 네트워크에서의 간섭 제어 분석)

  • Kim, Seong-Eui;Kim, Ki-Su;Hong, Een-Kee
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.3
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    • pp.268-276
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    • 2013
  • In this paper, we introduce the technologies to handle the interference in the heterogeneous network and evaluate the performance of enhanced Inter-Cell Interference Coordination (enhanced ICIC, eICIC) techniques that are being introduced in 3GPP Release 10. In the time-domain eICIC scheme, time-domain resources are scheduled to avoid the interference by using Almost Blank Subframe (ABS) and Cell Range Expansion (CRE). To mitigate the cross-tier interference between macro and femtocell, it is important to efficiently combine the ABS and CRE in heterogeneous network. Since it is hard to evaluate the total throughput of heterogeneous network numerically, we evaluate the total throughput by using system level simulation (SLS). As a result of evaluation, the throughputs of many different cases of combination of ABS and CRE are compared.

Energy-Efficient Base Station Operation in Heterogeneous Cellular Networks

  • Nguyen, Hoang-Hiep;Hwang, Won-Joo
    • Journal of Korea Multimedia Society
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    • v.15 no.12
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    • pp.1456-1463
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    • 2012
  • In this paper, we study the ON/OFF control policy of base stations in two-tier heterogeneous cellular networks to minimize the total power consumption of the system. Using heterogeneous cellular networks is a potential approach of providing higher throughput and coverage compared to conventional networks with only macrocell deployment, but in fact heterogeneous cellular networks often operates regardless of total power consumption, which is a very important issue of modern cellular networks. We propose a policy that controls the activation/deactivation of base stations in heterogeneous cellular networks to minimize total power consumption. Under this policy, the total power consumed can be significantly reduced when the traffic is low while the QoS requirement is satisfied.

A study on IP mobility for data service between heterogeneous networks based on IMS (IMS 기반의 이종망간 데이터 이동성기술 적용방안 연구)

  • Kim, Tae-Wan;Kim, Hee-Dong;Nan, Sung-Yong;Sung, Min-Mo
    • 한국정보통신설비학회:학술대회논문집
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    • pp.304-308
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    • 2008
  • The standardization for Seamless IP Mobility between heterogeneous networks is being progressed according to each specific purpose of the organizations such as ITU-T (International Telecommunications Union - Telecommunication), 3GPP(3rd Generation Partnership Project), IETF(Internet Engineering Task Force), and IEEE(Institute of Electrical and Electronics Engineers). [1] Specially VCC (Voice Call Continuity) for seamless voice continuity between heterogeneous networks using IMS (IP Multimedia Subsystem) of the next generation platform is being introduced into a few companies, and also MIH (Media Independent Handover) and MIP (Mobile IP) for IP mobility between heterogeneous networks are being customized by their internal situation. This article describes the idea to support IP Mobility between heterogeneous networks in the network which IMS platform is deployed and only supports the mobility for the voice by the type of AS (Application Server).

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Sojourn Time Analysis Using SRPT Scheduling for Heterogeneous Multi-core Systems (Heterogeneous 멀티코어 시스템에서 SRPT 스케줄링을 사용한 체류 시간 분석)

  • Yang, Bomi;Park, Hyunjae;Choi, Young-June
    • Journal of KIISE
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    • v.44 no.3
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    • pp.223-231
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    • 2017
  • In this paper, we study the performance of recently popular multi-core systems in mobiles. Previous research on the multi-core performance usually focused on the desktop PC. However, there is enough scope to further analyze heterogeneous multi-core systems. Therefore, by extending homogeneous multi-core systems, we analyze the heterogeneous multi-core systems using Size Interval Task Allocation (SITA) for job allocation, and Shortest Remaining Processing Time (SRPT) scheduling, for each individual core. We propose a new computational method regarding the cutoff point, which is crucial in analyzing SITA, by calculating the sojourn time. This facilitate easy and accurate calculation of the sojourn time. We further confirm our analysis through the ESESC simulator that provides actual measurements.

Preparation of Heterogeneous Bipolar Membranes Using Poly (phenylene oxide, PPO) Polyelectrolyte and Their Water Splitting Properties (Poly (phenylene oxide, PPO) 고분자 전해질을 이용한 불균질 바이폴라막 제조 및 물분해 특성)

  • Kim, In Sik;Hwang, Seong Yeon;Kang, Byung Gwan;Hwang, Taek Sung
    • Korean Chemical Engineering Research
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    • v.57 no.1
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    • pp.65-72
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    • 2019
  • In this study, heterogeneous ion exchange membranes were prepared by casting method with various mixing ratios of PPO ion-selective solution and ion exchange resin. Then heterogeneous bipolar membranes were prepared by using this. The water content of heterogeneous cation and anion exchange membranes were 60~80% respectively, the ion exchange capacity was 2.81~3.26 meq/g, 2.31~2.74 meq/g and electrical resistances were $1.65{\sim}1.45{\Omega}{\cdot}cm^2$ and $1.55{\sim}1.05{\Omega}{\cdot}cm^2$. The tensile strength of heterogeneous bipolar membrane was lower than that of PPO resin before functionalization ($700Kg_f/cm^2$). The tensile strength of heterogeneous bipolar membrane with catalyst layer was lower than that of non-catalytic heterogeneous bipolar membrane. The water splitting voltage of the heterogeneous bipolar membrane with catalyst layer was low and stable at a minimum of 1.7~1.8 V, maximum 3.9~4.0 V, and the water splitting voltage of the non-catalytic heterogeneous bipolar membrane was constant at 3.8~4.0 V.

Multimedia Room Bridge Adapter for Seamless Interoperability between Heterogeneous Home Network Devices

  • Lee, Myung-Jin;Chung, Gi Hoon;Kang, Soon-Ju
    • IEMEK Journal of Embedded Systems and Applications
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    • v.1 no.2
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    • pp.43-55
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    • 2006
  • A home network is a typical ubiquitous computing network that consists of various consumer devices and service environments. Home networks are requiring increasingly more complicated services, such as multimedia home theater and the monitoring and controlling of heterogeneous devices. Accordingly, a mutually connecting mechanism is needed among heterogeneous devices and services redundant. The current paper presents a Multimedia Room Bridge Adapter (MRBA) system that is designed to manage heterogeneous devices and support various services. In addition, a hardware and software prototype is implemented based on the proposed architecture.

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Incentive Mechanism Design for Heterogeneous Networking Routing

  • Shu, Yongan;Shu, Ziyu;Luo, Bin
    • Journal of Communications and Networks
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    • v.16 no.4
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    • pp.458-464
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    • 2014
  • In the future, an increasing number of heterogeneous networks will be connected with each other. Each of them has its own interest. Existing systems lack good incentive mechanisms to attract more networks to participate in cooperations. In this paper, we design an auction-based incentive mechanism for routing protocols applied in heterogeneous networking which is computationally efficient, individually rational, profitable, and truthful. Through several simulations, we evaluate the performance and validate the properties of our mechanism.