• Title/Summary/Keyword: Multi-interface

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Annealing Effect on Adhesion Between Oxide Film and Metal Film (산화막위에 증착된 금속박막과 산화막과의 계면결합에 영향 미치는 열처리 효과)

  • Kim Eung Soo
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.1
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    • pp.15-20
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    • 2004
  • The interfacial layer between the oxide film and the metal film according to RTP annealing temperature of metal film has been studied. Two types of oxides, BPSG and PETEOS, were used as a bottom layer under multi-layered metal films. We observed the interface between oxide and metal films using SEM (scanning electron microscopy), TEM (transmission electron microscopy), AES (auger electron spectroscopy). Bonding failure was occurred by interfacial reaction between the BPSG oxide and the multi-layered metal films above $650^{\circ}C$ RTP anneal. The phosphorus accumulation layer was observed at interface between BPSG oxide and metal films by AES and TEM measurements. On the other hand, bonding was always good in the sample using PETEOS oxide as a bottom layer. We have known that adhesion between BPSG and multi-layered metal films was improved when the sample was annealed below $650^{\circ}C$.

Analysis of Multi-layered Thin Film Using ATR FT-IR and pyro-GC/MS (ATR FT-IR과 pyro-GC/MS를 이용한 다층박막필름의 분석)

  • Park, Sung Il;Lee, Jung-Hyun;Lee, Myung Cheon
    • Journal of Adhesion and Interface
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    • v.20 no.3
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    • pp.102-109
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    • 2019
  • The material constitution of multi-layered thin film coated on the PET base film was analyzed using ATR FT-IR and pyro GC/MS combination. The cross section of the film was acquired by cracking the film after dipping in liquid nitrogen and was observed using optical microscope. Total thickness of the coated film was $70{\mu}m$ and three layers were observed. Since each layers were too thin to analyze directly except the surface layer, analyzable area of each layers were exposed by using a proper solvent and were investigated using ATR FT-IR and pyro GC/MS. Results shows that three layers were commonly consisted of urethane-acrylate copolymers. Also, inorganic and/or metal inclusions detected by XPS and SEM-EDAX were exhibited by nano size $SiO_2$ particles in layer(1) and aluminum flakes in layer(2).

DEVELOPMENT OF SN BASED MULTI COMPONENT SOLDER BALLS WITH CD CORE FOR BGA PACKAGE

  • Sakatani, Shigeaki;Kohara, Yasuhiro;Uenishi, Keisuke;Kobayashi, Kojiro F.;Yamamoto, Masaharu
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.450-455
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    • 2002
  • Cu-cored Sn-Ag solder balls were fabricated by coating pure Sn and Ag on Cu balls. The melting behavior and the solderability of the BGA joint with the Ni/Au coated Cu pad were investigated and were compared with those of the commercial Sn-Ag and Sn-Ag-Cu balls. DSC analyses clarified the melting of Cu-cored solders to start at a rather low temperature, the eutectic temperature of Sn-Ag-Cu. It was ascribed to the diffusion of Cu and Ag into Sn plating during the heating process. After reflow soldering the microstructures of the solder and of the interfacial layer between the solder and the Cu pad were analyzed with SEM and EPMA. By EDX analysis, formation of a eutectic microstructure composing of $\beta$-Sn, Ag$_3$Sn, ad Cu$_{6}$Sn$_{5}$ phases was confirmed in the solder, and the η'-(Au, Co, Cu, Ni)$_{6}$Sn$_{5}$ reaction layer was found to form at the interface between the solder and the Cu pad. By conducting shear tests, it was found that the BGA joint using Cu-cored solder ball could prevent the degradation of joint strength during aging at 423K because of the slower growth me of η'-(Au, Co, Cu, Ni)$_{6}$Sn$_{5}$ reaction layer formed at the solder, pad interface. Furthermore, Cu-cored multi-component Sn-Ag-Bi balls were fabricated by sequentially coating the binary Sn-Ag and Sn-Bi solders on Cu balls. The reflow property of these solder balls was investigated. Melting of these solder balls was clarified to start at the almost same temperature as that of Sn-2Ag-0.75Cu-3Bi solder. A microstructure composing of (Sn), Ag$_3$Sn, Bi and Cu$_{6}$Sn$_{5}$ phases was found to form in the solder ball, and a reaction layer containing primarily η'-(Au, Co, Cu, Ni)$_{6}$Sn$_{5}$ was found at the interface with Ni/Au coated Cu pad after reflow soldering. By conducting shear test, it was found that the BGA joints using this Cu-core solder balls hardly degraded their joint shear strength during aging at 423K due to the slower growth rate of the η'-(Au, Cu, Ni)$_{6}$Sn$_{5}$ reaction layer at the solder/pad interface.he solder/pad interface.

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Load-Aware Channel Switching Algorithm for Multi-Channel Multi-Hop Wireless Network (멀티 채널 멀티 홉 무선 네트워크에서 부하 인지 채널 변경 기술)

  • Kang, Min-Su;Lee, Young-Suk;Kang, Nam-Hi;Kim, Young-Han
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.10
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    • pp.110-118
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    • 2007
  • In multi-hop wireless network, multi-channel makes it possible to enhance network performance because it reduces channel interferences md contentions. Recently several schemes have been proposed in the literatures to use multi-channel. Especially, MCR(Multi channel routing protocol), which utilize hybrid interface assignment, is a prominent routing protocol. MCR uses simple way to change channel but efficiently reduce channel interferences. In this paper, we propose a load-aware channel selection algorithm called LCS that enhances the channel switching algerian used in MCR protocol. In LCS, channel of a node is assigned based on collected information about queue length of neighbors. Moreover this paper evaluates the performance of in by using simulation test and testbed demonstration. Test results show that the MCR with LCS outperforms the naive MCR.

Study on Multi-switching Sensor-based LED Lighting Control Technology (멀티스위칭 센서기반 LED 조명제어기술에 관한 연구)

  • Jang, Tae-Su;Hong, Geun-Bin;Lee, Dae-Hyoung;Kim, Yong-Kab;Kim, Byun-Gon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.05a
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    • pp.813-814
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    • 2012
  • Recently, along with a development to promote low-carbon green growth, LED control IT convergence technology that can create environmentally-friendly emotional lighting is receiving attention. This is an interface control technology that includes a multi-sensor, switching technology, LED optics, and Internet-based remote lighting control, all of which utilize the lighting characteristics of LED lighting. The proposed system is a study on an intelligent LED control technology, and aims to use a multi-switching sensor in order to control LED discharge current so as to improve energy-charging method, to use a battery's SoC sensor, and to improve efficiency in the winter according to a section.

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Comparison of Vibration Characteristics of a Multi-leaf Spring and a Tapered Leaf Spring of a Heavy Truck (대형트럭 다판 스프링과 테이퍼 판스프링의 진동특성 비교)

  • Oh Chae-Youn;Moon Il-Dong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.2 s.233
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    • pp.270-276
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    • 2005
  • This paper develops the flexible computational model of a heavy truck by interfacing the frame modeled as a flexible body to the heavy truck's computational model composed of rigid bodies. The frame is modeled by the finite element method. Three torsional modes and three bending modes of the frame are considered for the interface of the heavy truck's computational model. The actual vehicle test is conducted off road with a velocity of 20km/h. The vertical accelerations at the cab and front axle are measured in the test. For the verification of the developed computational model, the measured vertical acceleration profiles are compared with the simulation results of the heavy truck's flexible computational model. E grade irregular road profile of ISO is used as an excitation input in the simulation. The verified flexible computational model is used to compare the vibration characteristics of a front suspension system having a multi-leaf spring and that having a tapered leaf spring. The comparison results show that the front suspension having a tapered leaf spring has a higher vertical acceleration at the front axle but a lower vertical acceleration at the cab than the suspension system having a multi-leaf spring.

MLPPI Wizard: An Automated Multi-level Partitioning Tool on Analytical Workloads

  • Suh, Young-Kyoon;Crolotte, Alain;Kostamaa, Pekka
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.12 no.4
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    • pp.1693-1713
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    • 2018
  • An important technique used by database administrators (DBAs) is to improve performance in decision-support workloads associated with a Star schema is multi-level partitioning. Queries will then benefit from performance improvements via partition elimination, due to constraints on queries expressed on the dimension tables. As the task of multi-level partitioning can be overwhelming for a DBA we are proposing a wizard that facilitates the task by calculating a partitioning scheme for a particular workload. The system resides completely on a client and interacts with the costing estimation subsystem of the query optimizer via an API over the network, thereby eliminating any need to make changes to the optimizer. In addition, since only cost estimates are needed the wizard overhead is very low. By using a greedy algorithm for search space enumeration over the query predicates in the workload the wizard is efficient with worst-case polynomial complexity. The technology proposed can be applied to any clustering or partitioning scheme in any database management system that provides an interface to the query optimizer. Applied to the Teradata database the technology provides recommendations that outperform a human expert's solution as measured by the total execution time of the workload. We also demonstrate the scalability of our approach when the fact table (and workload) size increases.

A Design of Industrial Controller with Multi-function and Multi-purpose (다기능 다목적을 갖는 산업용 제어기 설계)

  • 정보환;남진문
    • Journal of the Korea Computer Industry Society
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    • v.2 no.4
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    • pp.481-490
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    • 2001
  • In this paper, we propose the industrial controller with multi-function/multi-purpose in order to cope with a small-amount and large-items environments. The controller designed consists of Main Unit including all of information and Display Unit. The software in the Main Unit is composed of tasks and device drivers and each task is being processed in parallel by operating system supporting multitasking. The controller is structured in three levels to promptly address the control algorithm’s modification, MMI’s change, and so on. We can produce a controller without changing the first layer(hardware) and the second layer(firmware). We only modify the third layer(control algorithm) depending on control targets.

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An Integrated Shop Operation System for Multi-Cell Flexible Manufacturing Systems under Job Shop Environments (멀티 셀 유연생산환경을 위한 통합운용시스템)

  • Nam, Sung-Ho;Ryu, Kwang-Yeol;Shin, Jeong-Hoon;Kwon, Ki-Eok;Lee, Seok-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.4
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    • pp.386-394
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    • 2012
  • Recent trends in the flexible manufacturing systems are morphing cell control for the shop-wide production operation system and providing the integrated operation and execution system together with vendor-specific FMC/FMS platform. In these requirements, the shop-floor level operation system plays a role of coordinating the control activity of each cell, and has to provide flexibility for the complexity of mixed operations of various cells. This paper suggests a system architecture for the mixed environments of multi-cells and job shop, its corresponding enabling technologies based on comparative studies with other related studies and commercialized systems. This approach includes a process definition model considering the integration with upper BOM-BOP and external service modules, and reconfigurable device-level interface which provides dynamic interconnections with machine tools and cell controllers. The function modules and their implementation results are also described to provide the feasibility of the proposed approaches as the flexible shop-floor operation system for the multi-cell environments.

Design of DSP(TMS320F240) Controller for Multi-axes Transportation System with BLDC Servo Motor (DSP(TMS320F240)를 이용한 BLDC서보 전동기 다축 이송시스템 제어기 설계)

  • 김민섭;구효원;최중경;권현아;신영호
    • Proceedings of the IEEK Conference
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    • 2002.06e
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    • pp.95-98
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    • 2002
  • This paper presents a study on DSP(TMS320F240) controller design for multi-axes transportation system using BLDC servo motor. This BLDC servo motor controller was realized with DSP(Digital Signal Processor) and IPM (Intelligent Power Module). The multi-axes transportation system needs torque, speed, position control of servo motor for variable action. This paper implements those servo control with vector control and space vector modulation technique. As CPU of controller DSP(TMS320F240) is adopted because, it has PWM(Pulse Width Modulation) waveform generator, A/D(Analog to Digital) converter, SPI(Serial Peripheral Interface) port and input/output port etc. The controller of multi-axes transportation system consists of 3-level hierarchy structure that main host PC manages three sub DSP system which transfer downword command and are monitoring the states of end servo controllers. Each sub DSP system operates eight BLDC servo controllers which control BLDC servo motor using DSP and IPM Between host system and middle digital signal processor communicate with RS-422, between main processor and controller communicate with SPI port.

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