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Polarization-induced photocurrent switching effect in heterojunction photodiodes

Nano Research 2023年第4期16卷 5503-5510页

作者： Dingbo Chen Yu-Chang Chen Guang Zeng Yu-Chun Li Xiao-Xi Li Dong Li Chao Shen Nan Chi Boon S.Ooi David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Key Laboratory for Information Science of Electromagnetic Waves Department of Communication Science and EngineeringFudan UniversityShanghai 200433China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The unipolar photocurrent in conventional photodiodes(PDs)based on photovoltaic effect limits the output modes and potential versatility of these devices in *** photodiodes with photocurrent switching are emerging as a promising solution for obtaining photoelectric devices with unique and attractive functions,such as optical logic ***,we design an all-solid-state chip-scale ultraviolet(UV)PD based on a hybrid GaN heterojunction with engineered bipolar polarized electric *** introducing the polarization-induced photocurrent switching effect,the photocurrent direction can be switched in response to the wavelength of incident light at 0 V *** particular,the photocurrent direction exhibits negative when the irradiation wavelength is less than 315 nm,but positive when the wavelength is longer than 315 *** device shows a responsivity of up to−6.7 mA/W at 300 nm and 5.3 mA/W at 340 nm,*** particular,three special logic gates in response to different dual UV light inputs are demonstrated via a single bipolar PD,which may be beneficial for future multifunctional UV photonic integrated devices and systems.

关键词： GaN heterostructure ultraviolet(UV)photodiodes bipolar photocurrent optical logic device

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Non-adiabatic losses in fused fiber couplers-experimental findings

Non-adiabatic losses in fused fiber couplers-experimental fi...

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2002 5th IEEE International Conference on Semiconductor Electronics, ICSE 2002

作者： Shaarj, Ahmad Zaki Abdullah, Mohd. Khazani Shaarj, Sahbudin Photonics Technology Laboratory Department of Electrical Electronics and System Engineering Universit i Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Photonics Laboratoiy Department of Computer and Communication Systems Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

ISBN: (纸本)0780375785

Bi-conically tapered single-mode couplers are fabricated using a fiber fusion coupler workstation. Losses found during fabrication are analyzed for a range of elongation. It is found that longer elongations will lower the losses. Theoretically, the losses are due to the taper paths crossing delineating curves. These losses which occur during tapering process are not really adiabatic if part of the signal power is not guided at the end of tapering process. In other words, taper path will not be inside adiabatic region of cladding guidance. It will cross from core-guidance region into lossy region or non-adiabatic region of cladding guidance.

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Preliminary Exploration on Node-To-Node Fault Tolerance Coordination in Distributed system

Preliminary Exploration on Node-To-Node Fault Tolerance Coor...

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2023 IEEE International Conference on Computing, ICOCO 2023

作者： Saadoon, Muntadher Hamid, Siti Hafizah Ab. Sofian, Hazrina Altarturi, Hamza Nasuha, Nur Azizul, Zati Hakim Khalid, Haqi Universiti Malaya Faculty of Computer Science and Information Technology Department of Software Engineering Kuala Lumpur50603 Malaysia Universiti Malaya Faculty of Computer Science and Information Technology Department of Computer System and Technology Kuala Lumpur50603 Malaysia Universiti Malaya Faculty of Computer Science and Information Technology Department of Artificial Intelligence Kuala Lumpur50603 Malaysia Universiti Putra Malaysia Faculty of Engineering Department of Computer and Communication Selangor 43400 Malaysia

ISBN: (纸本)9798350302684

Internet of Things, edge computing devices, the widespread use of artificial intelligence and machine learning applications, and the extensive adoption of cloud computing pose significant challenges to maintaining fault tolerance in distributed systems. As the volume and complexity of systems continue to grow, the probability of system failures also grows, leading to downtime and poor performance. Fault tolerance is pivotal in modern computing systems by preventing downtime and service disruptions, even during failures. However, adopting fault tolerance comes with additional resource consumption, such as memory, CPU, disk, and network bandwidth usage, impacting system performance. Balancing fault tolerance with system performance is crucial to optimize resource utilization while minimizing the costs associated with detecting and recovering from faults. This paper introduces a node-to-node fault tolerance coordination mechanism for distributed systems to facilitate the tradeoff between fault tolerance and the cost of performance penalties and resource consumption. The proposed mechanism is preliminarily implemented on HDFS cluster. Our proposal enables opportunities to minimize the cost of the fault tolerance impact on performance and resource usage compared to the existing fault tolerance coordination mechanism. © 2023 IEEE.

关键词： Fault tolerance

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THEORETICAL AND EXPERIMENTAL RESULTS OF ENERGY BASED SWINGING UP CONTROL FOR A REMOTELY DRIVEN ACROBOT

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IFAC Proceedings Volumes 2005年第1期38卷 241-246页

作者： Xin XIN Masahiro KANEDA Taiga YAMASAKI Kazuhisa OMASA Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 JAPAN

The swinging up control for a remotely driven Acrobot (RDA) is studied and an energy based controller is designed via the Lyapunov stability theory. The analysis of convergence of the energy as well as the motion of the RDA under the controller is presented. The conditions on control parameters for achieving a successful swinging up control are given. Furthermore, simulation and experimental results are provided to validate the presented theoretical results.

关键词： the Acrobot Underactuated mechanical system Swinging up control Robot control Stability Lyapunov methods Energy control Attractor

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Generating power-optimal standard cell library specification using neural network technique

Generating power-optimal standard cell library specification...

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Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PrimeAsia)

作者： S. H. Lim Y. W. Lim S. Mashohor N. A. Kamsani R. M. Sidek S. J. Hashim F. Z. Rokhani Department of Computer and Communication System Engineering Department of Electrical and Electronic Engineering University Putra Malaysia Serdang Selangor

In VLSI semi-custom design approach, power-optimal standard cell library selection for a given block design requires time-consuming iterative processes. This paper presents a framework to select a standard cell library that can result in near-optimal power while satisfying targeted frequency. The framework relies on neural network model to quickly predict the total power of a block design associated with a given standard cell library in order to speed up the synthesis process. The experimental result based on various synthesized benchmark circuits demonstrated the effectiveness of proposed framework for near-optimal standard cell library specification.

关键词： Libraries Standards Integrated circuit modeling Optimization Predictive models Benchmark testing Training

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Power allocation in multi-node cooperative network in Rician fading channels

Power allocation in multi-node cooperative network in Rician...

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IEEE International Conference on Wireless and Mobile Computing, Networking And communications (WiMob)

作者： Mulugeta K. Fikadu Mohammed Elmusrati Reino Virrankoski Department of Computer Science Communication and System Engineering Group University of Vaasa Vaasa Finland

Cooperative communications have been recommended to exploit the inherent spatial diversity gains in multiuser wireless systems without the need of multiple transceivers at each node. This is achieved when wireless nodes help to each other to send multiple independent transmission paths to the destination. The advantage of cooperation can be exploited significantly by allocating the power of the system optimally. Thus, in this paper we first derive the approximate symbol error rate (SER) for multi-node cooperative networks employing decode-and-forward (DF) protocol with a maximum ratio combining (MRC) at the receiving terminals in Racian fading channels. Using the approximated SER expression, optimal power allocation (OPA) scheme under different line-of-sight (LOS) scenarios is investigated. Numerical and simulation results are presented to illustrate the performance improvement due to OPA of the cooperative networks.

关键词： Relays Resource management Rician channels Cooperative systems Fading Signal to noise ratio Wireless sensor networks

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Hybrid CNN LSTM Approach for Sentiment Analysis of Bengali Language Comment on Facebook 2

Hybrid CNN LSTM Approach for Sentiment Analysis of Bengali L...

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2nd IEEE International Conference on Integrated Circuits and communication systems, ICICACS 2024

作者： Nobel, SM Nuruzzaman Swapno, S M Masfequier Rahman Ramachandra, A.C. Shajeeb, Hasibul Hossain Islam, Md Babul Haque, Rezaul Bangladesh University of Business and Technology Dept of Computer Science and Engineering Dhaka Bangladesh Nitte Meenakshi Institute of Technology Department of Electronics and Communication Engineering Bengaluru India UNICAL Dept. of Computer Modeling Electronic and System Engineering Rende Italy East West University Dept of CSE Dhaka1212 Bangladesh

ISBN: (纸本)9798350317558

This study addresses the challenge of sentiment analysis in Bengali Facebook comments, where users express their opinions on various topics. Existing sentiment analysis techniques have difficulty achieving high accuracy in this situation, which has inspired the creation of a fresh methodology. To improve sentiment analysis of Bengali Facebook comments, we suggest a model that combines a hybrid convolutional neural network (CNN) and a long short-term memory network (LSTM). Our research adds to the expanding area of sentiment analysis, especially for languages with few resources, such as Bengali. The success of the Hybrid CNN LSTM model opens the door for more precise and context-aware sentiment analysis on social media platforms, allowing for a better understanding of user sentiments and boosting user experiences. Our study focused on dividing comments into five groups according to their emotional content: troll, not bully, sexual, religious, and threat. We carefully generated the handmade dataset and ensured the quality and relevance of a dataset of 50,000 Bengali comments before using it to train and test our algorithm. The Hybrid CNN LSTM model outperforms conventional approaches and achieves an outstanding accuracy rate of 92.09%, demonstrating amazing efficiency in sentiment recognition. This dramatic increase in precision indicates that machine learning techniques are successful in sentiment analysis of Bengali Facebook comments. © 2024 IEEE.

关键词： Bengali Language CNN Comment Facebook Fully Connected Layer Hybrid LSTM NLP Predict Sentiment

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W-band radio-over-fiber link based on self-oscillating optical frequency comb generator

W-band radio-over-fiber link based on self-oscillating optic...

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2018 Optical Fiber communications Conference and Exposition, OFC 2018

作者： Hasanuzzaman, G.K.M. Kanno, Atsushi Dat, Pham Tien Iezekiel, Stavros Microwave Photonics Research Laboratory Department of Electrical and Computer Engineering University of Cyprus Nicosia1678 Cyprus Network System Research Institute National Institute of Information and Communication Technology Tokyo184-8795 Japan

A 94.8 GHz radio-over-fiber link was implemented with a self-oscillating frequency comb. An LTE Advanced OFDM FDD 64-QAM signal of 20 MHz bandwidth was transmitted over 1.3 m wireless distance with an EVM of 2.23%. &#... 详细信息

ISBN: (纸本)9781943580385

关键词： Radio-over-fiber

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Board-level diagnosis by signature analysis

Board-level diagnosis by signature analysis

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IEEE International Test Conference

作者： M.G. Karpovsky P. Nagvajara Research Laboratory for Design and Testing of Computer and Communication Systems Computer and Communication Systems Computer and Communication Systems Department of Electrical Computer and System Engineering Boston University Boston MA USA

Board-level diagnostic techniques by signature analysis based on single-error-correcting Hamming codes over GF(2/sup M/) (where M is the number of outputs per chip) are presented. Two techniques are considered: the space-time compressor technique for the case when responses from N chips on the board are wired to the compressor; and the time compressor technique for the case when test responses from each chip are transferred to the compressor via system bus. Assuming a single-faulty-chip model, a faulty chip on the board under test is located by an analysis of the relationship between the distortions in the obtained signatures. Both techniques for board-level diagnosis require less hardware than the straightforward diagnostic techniques using a built-in signature analyzer for every chip or selective testing of each chip via the system bus, hence offering an efficient approach for a design of a built-in-self-test board for for manufacturing testing.< >

关键词： system testing system buses Hardware Built-in self-test Automatic testing Pattern analysis Fault diagnosis Laboratories Design engineering systems engineering and theory

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Stabilization of decision threshold for BER improvement using double carrier modulation/differential detection for outdoor optical wireless communications

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International Review on computers and Software 2009年第3期4卷 301-307页

作者： Hitam, Salasiah Abdullah, Mohd Khazani Adnan, Wan Azizun Wan Sahbuddin, Ratna Kalos Zakiah Department of Computer System and Communication Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

A new transmission and detection technique namely Double Carrier Modulation/Differential Detection (DCM/Diff.D) for outdoor optical wireless (OW) is proposed. The technique employs two beams, one modulated with the data, the other with the inverted version of the same data. A differential detection technique is used at the receiver whereby the inverted data are used as the reference to perform the decision making, as opposed to the fixed threshold used in conventional technique. The probability of error under threshold instability in DCM/Diff.D technique and Intensity Modulation/Direct Detection (IM/DD) technique, is compared. A simulation under heavy rainfall condition of 8.33x10-4 cm/s at bit rate of 2.5 Gbps with 0 dBm of optical transmitter power shows that this technique achieves an improvement of more then twice of distance of the conventional IM/DD. © 2009 Praise Worthy Prize S.r.l. - All rights reserved.

关键词： Decision making

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