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Use of Anisotropic Laser Etching and Transparent Conducting Layer to Alleviate Current Crowding Effect in Vertical-Structured GaN-Based Light-Emitting Diodes 64

Use of Anisotropic Laser Etching and Transparent Conducting ...

引用

64th Device Research Conference, DRC 2006

作者： Wang, Shui-Jinn Chen, Tron-Min Uang, Kai-Ming Chen, Shiue-Lung Tsai, Ching-Chung Liou, Bor-Wen Yang, Su-Hua Institute of Microelectronics Dept. of Electrical Eng. National Cheng Kung Univ. Tainan Taiwan Dept. of Electrical Eng. Wu-Feng Institute of Technology Chia-yi Taiwan Dept. of Computer Science and Information Eng. Wu-Feng Institute of Technology Chia-yi Taiwan National Kaohsiung University of Applied Sciences Department of Electronic Engineering Taiwan

ISBN: (纸本)0780397495

An anisotropic laser etching to the surface layer (n-GaN) of vertical-structured GaN-based light-emitting diodes (LEDs) associated with a transparent conducting layer (TCL) to release current crowding effect (CCE) for better light emission uniformity and higher optical efficiency is proposed and demonstrated. The theory behind the proposed scheme was verified by a two-dimensional device simulator (ISE-TCAD), which indicates that immune of CCE would be possible once an optimal combination of the concave-structured n-GaN layer and TCL has been achieved. In experiments, 40-mil LEDs with an anisotropic etching area of 800 μm in diameter, an etching depth of 1.75 μm at center, and a 300-nm-thick Indium-Zinc-Oxide (IZO) layer have been successfully prepared. Typical improvement in light output power by 26% at an injection current of 350 mA as compared to the one without anisotropic etching has been obtained. © 2006 IEEE.

关键词： Gallium nitride

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Fabrication of High-Power Vertical GaN-Based Light-Emitting Diodes with Selective Nickel Electroplating and Patterned Laser Lift-Off Techniques

Fabrication of High-Power Vertical GaN-Based Light-Emitting ...

引用

Device Research Conference

作者： Shui-jinn Wang Shiue-lung Chen Kai-ming Uang Wei-chi Lee Tron-min Chen Bor-wen Liou Su-hua Yang Institute of Microelectronics Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Electrical Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Computer Science and Information Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Electronic Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

ISBN: (纸本)1424497495;0780397487

A novel process for fabricating high-power Vertical-structure Metallic substrate GaN-based light-emitting diodes (VM-LEDs) employing selective nickel electroplating and patterned laser lift-off (LLO) techniques was proposed. Advantages including the avoidance of metal-cutting process, easy in die size definition through laser spot control, and simplification of fabrication processes (i.e., fewer masks as well as less effort in wire bonding) were demonstrated. As compared to regular lateral-structure LEDs, the VM-LEDs experimentally show having an increase in light output power (Lop) (i.e., ΔLop/Lop) by 293.4% at 350 mA with a decrease in forward voltage from 3.73 V down to 3.32 V.

关键词： Optical device fabrication Light emitting diodes Nickel Surface morphology Power generation Rough surfaces Surface roughness Laser theory Voltage Wafer bonding

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Use of Anisotropic Laser Etching and Transparent Conducting Layer to Alleviate Current Crowding Effect in Vertical-Structured GaN-Based Light-Emitting Diodes

Use of Anisotropic Laser Etching and Transparent Conducting ...

引用

Device Research Conference

作者： Shui-jinn Wang Tron-min Chen Kai-ming Uang Shiue-lung Chen Ching-chung Tsai Bor-wen Liou Su-hua Yang Institute of Microelectronics Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Electrical Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Computer Science and Information Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Electronic Engineering National Kaohsiung University of Applied Sciences Taiwan

ISBN: (纸本)1424497495;0780397487

关键词： Anisotropic magnetoresistance Etching Proximity effect Light emitting diodes Gallium nitride Laser beams Power generation microelectronics computer science Laser theory

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Dynamic reconfiguration with hardwired networks-on-chip on future FPGAs

Dynamic reconfiguration with hardwired networks-on-chip on f...

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2005 International Conference on Field Programmable Logic and Applications, FPL

作者： Hecht, Ronald Kubisch, Stephan Herrholtz, Andreas Timmermann, Dirk Institute of Applied Microelectronics and Computer Engineering University of Rostock Richard-Wagner Str. 31 18119 Rostock-Warnemuende Germany

ISBN: (纸本)0780393627

Due to their layered approach, Networks-on-Chip (NoC) are a promising communication backbone in the field of heterogeneous dynamically reconfigurable systems. In this paper a future FPGA architecture is discussed having a hardwired NoC as an additional high-level routing resource. Instead of implementing on-chip interconnection with valuable reconfigurable resources, on top of this architecture, cost-efficient statically and dynamically reconfigurable systems can be built. The concept of such an FPGA is explored by means of an abstract SystemC model. This model not only implements the NoC but also permits a tile based dynamic reconfiguration. It will be shown, that this approach advances the research on operating system support for dynamic reconfiguration in a new way. © 2005 IEEE.

关键词： Field programmable gate arrays

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UPnP AV architecture - Generic interface design and Java implementation

UPnP AV architecture - Generic interface design and Java imp...

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IASTED International Conference on Parallel and Distributed Computing and Networks, as part of the 23rd IASTED International Multi-Conference on applied Informatics

作者： Bobek, Andreas Bohn, Hendrik Golatowski, Frank Institute of Applied Microelectronics and Computer Science University of Rostock Richard-Wagner-Str. 31 18119 Rostock-Warnemünde Germany

This paper describes the UniRo Universal Plug and Play(UPnP) Audio Video (AV) stack that was implemented in Java programming language. The UniRo UPnP AV Stack is a software component that can be used to develop AV applications (MediaServer, MediaRenderer, and AV Control Points). The AV interfaces form the core of this component. They provide a typing layer to access AV devices and AV services. AV interfaces hide the complexity of UPnP AV architecture and singularity of specific underlying UPnP stacks. AV applications written to this stack are portable to other UPnP stacks without changing the source code.

关键词： computer architecture

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Advantages of FPGA-based multiprocessor systems in industrial applications

Advantages of FPGA-based multiprocessor systems in industria...

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Annual Conference of Industrial Electronics Society

作者： R. Joost R. Salomon Institute of Applied Microelectronics and Computer Engineering University of Rostock Rostock Germany

Today, industrial production machines must be highly flexible in order to competitively account for dynamic and unforeseen changes in the product demands. This paper shows that field-programmable gate arrays (FPGAs) are especially suited to fulfil these requirements; FPGAs are very powerful, relatively inexpensive, and adaptable, since their configuration is specified in an abstract hardware description language. In addition to the benefits resulting from using an FPGA, the case study presented here shows how FPGAs can be used for implementing a sophisticated multiprocessor architecture. In the course of presentation, this paper furthermore argues that due to the excellent tool support and the availability of reusable functional modules (also known as intellectual properties) this approach can be adopted by almost any industrial hardware designer.

关键词： Multiprocessing systems Field programmable gate arrays Hardware Machinery production industries Application software Control systems Costs Microcontrollers computer industry microelectronics

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Quality of service and proactive content replication in UPnP based A/V environments

Quality of service and proactive content replication in UPnP...

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IASTED International Conference on Parallel and Distributed Computing and Networks, as part of the 23rd IASTED International Multi-Conference on applied Informatics

作者： Ditze, Michael Loeser, Chris Bohn, Hendrik Bobek, Andreas Golatowski, Frank Fürstenallee 11 33102 Paderborn Germany Institute of Applied Microelectronics and Computer Science University of Rostock Richard-Wagner-Strasse 32 18119 Rostock-Warnemuende Germany

Multimedia Applications e.g. Video/Audio streaming increasingly strive for deployment in distributed and domain spanning networking environments. In order to ensure the service interoperability between content servers and rendering devices across heterogeneous platforms, distributed middleware approaches offer promising concepts (e.g. Service Oriented Architectures). The UPnP forum has developed a platform-neutral architectural framework that specifies a set of well defined service discovery and access routines concealed behind a unified set of protocols and their APIs. While UPnP supports service interoperability additional service extensions are required to satisfy requirements as imposed by many multimedia applications. These requirements cover QoS support from the application source to the sink which entails the encapsulation of signalling services that allow for resource reservation on network and end-devices. Furthermore we introduce a proactive content replication paradigm: According to popularity forecasts it is possible to create replicas of e.g. movie content to avoid hot-spots maintaining very popular content in large scale networks. The contribution of this paper is to identify domain spanning distributed multimedia scenarios and describe the challenges for developing enhancing services to the UPnP framework that help to establish them.

关键词： Multimedia systems

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Dynamic reconfiguration with hardwired networks-on-chip on future FPGAs

Dynamic reconfiguration with hardwired networks-on-chip on f...

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International Conference on Field Programmable Logic and Applications

作者： R. Hecht S. Kubisch A. Herrholtz D. Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Due to their layered approach, networks-on-chip (NoC) are a promising communication backbone in the field of heterogeneous dynamically reconfigurable systems. In this paper a future FPGA architecture is discussed having a hardwired NoC as an additional high-level routing resource. Instead of implementing on-chip interconnection with valuable reconfigurable resources, on top of this architecture, cost-efficient statically and dynamically reconfigurable systems can be built. The concept of such an FPGA is explored by means of an abstract SystemC model. This model not only implements the NoC but also permits a tile based dynamic reconfiguration. It is shown, that this approach advances the research on operating system support for dynamic reconfiguration in a new way.

关键词： Field programmable gate arrays Network-on-a-chip Operating systems Tiles Spine Routing Prototypes Wires microelectronics computer networks

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Wireless sensor systems - constraints and opportunities

Wireless sensor systems - constraints and opportunities

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Euromicro Symposium on Digital System Design

作者： D. Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Summary form only given. The collaboration of countless tiny sensor nodes in a network promises an enormous potential of novel applications. Advances in miniaturization and integration of electronic and mechanical components will enable sensor nodes with a size of a few cubic millimeters in the near future. At the same time, an ongoing price decline will allow the deployment of sensor networks covering thousands of nodes and, as a consequence, replace conventional wired sensors in many areas. Besides application-specific tasks of a node, the entire network requires a conformance to dynamical system requirements. The development focus changes from the single result of a sensor node to the cumulative result of the network. Consequentially, the following requirements for the design and implementation process of sensor networks arise: (i) sensor networks have to be self-organizing, (ii) sensor nodes must perform tasks of network maintenance, (iii) cooperative processing of tasks should lead to more precise results and new application fields, (iv) sensor networks require security mechanisms that are adaptive to environmental conditions, (v) all algorithms and protocols must be optimized with respect to resources, i.e. energy. The key constraint is energy. While many research teams are investigating better means to store, save, or generate electrical energy, progress is still slow. The paper addresses the inherent limitations and arising research opportunities of wireless sensor networks, both in terms of hardware and software issues.

关键词： Wireless sensor networks Sensor systems Mechanical sensors microelectronics computer networks Collaboration Application software Process design Protocols Hardware

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Design Flow on a Chip - An Evolvable HW/SW Platform

Design Flow on a Chip - An Evolvable HW/SW Platform

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International Conference on Autonomic Computing (ICAC)

作者： S. Kubisch R. Hecht D. Timmermann Institute of Applied Microelectronics and Computer Engineering University of Rostock Germany

Partial dynamic reconfigurability of modern FPGAs holds the potential of realizing autonomous and highly flexible systems-on-chip (SoC). Current devices can be configured with several partial bitfiles and replace particular ones on demand. But these precompiled bitfiles seriously lack flexibility: they are hardly relocatable and not adjustable. In other words, they are tied to their original functional scope and location. This paper proposes an integration of the design flow onto the reconfigurable device itself to be capable of runtime reconfiguration and adaptation through modifications on the source code level. Thus, a network-on-chip (NoC) and a Linux operating system (OS) have been combined. The design flow is integrated into a feedback control system, which runs as an application under Linux. As a consequence, an evolvable platform emerges, which is capable of adapting autonomously to its dynamic environment and changing parameters

关键词： Network-on-a-chip Linux Hardware Switches Field programmable gate arrays Tiles Communication switching Protocols Kernel Resource management

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