检索结果-内蒙古大学图书馆

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Ryuhei Kajihara Han Wenkai Leonardo Lanante Masayuki Kurosaki Hiroshi Ochi Dept. Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan

ISBN: (数字)9781728144900

ISBN: (纸本)9781728144917

The Markov chain based model by Bianchi for IEEE802.11 distributed controlled access is a highly accurate analytical tool for estimating the system throughput when a single Basic Service Set (BSS) network operates in isolation. However, with the increase of wireless LAN access points being deployed on the same area, an environment with multiple BSS interfering with each other has become the default network scenario. The purpose of this work is to extend the single BSS Markov chain model into a multi-BSS model by incorporating the influence of STAs' interference range and carrier sense range to their own transmission and collision probabilities. We verify the proposed multi-BSS analytical model using the latest version of the ns-3 simulator which has recently supported accurate PHY abstractions for multi-BSS simulation. We show that the proposed model has a high accuracy (within 1%) independent of the multi-BSS network topology.

关键词： Throughput Markov processes Analytical models Wireless LAN Interference Land mobile radio Sensors

来源：评论

学校读者我要写书评

暂无评论

Experimental Analyses of an Efficient Aggregated Robot Processing with Cache-Control for Multi-Robot system

Experimental Analyses of an Efficient Aggregated Robot Proce...

引用

International Conference on Control, Automation and systems ( ICCAS)

作者： Abdul Jalil Jun Kobayashi STMIK Handayani Makassar Indonesia Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan

ISBN: (数字)9788993215205

ISBN: (纸本)9781728185620

This study aims to develop a network architecture for low-cost multi-robot systems, in which robots operate with limited hardware capability and on-board computational power. Low-speed data processing and high latency time in communication are unavoidable issues in such a multi-robot system. To address those problems, this study proposes Aggregated Robot Processing - Robot Operating system (ARP-ROS) as a network architecture for low-cost multi-robot systems. This network architecture arranges a computing environment dedicated to data processing in a multi-robot system. In the proposed network architecture, most of sensor data obtained by each robot are transmitted to the computing environment via the communication network and processed there, and then control commands are sent back to the robots. For the data exchange in the network architecture, ROS2 node communication is employed because it uses Data Distribution Service (DDS) suitable for real-time distributed embedded systems. In addition, Cache-Control Algorithm (CCA) is introduced to the communication network for its performance improvement. This paper presents experimental analyses of the ARP-ROS with CCA in terms of latency time and data process failures.

关键词： Robots Network architecture Robot sensing systems Multi-robot systems computer architecture Data processing Distributed databases

来源：评论

学校读者我要写书评

暂无评论

Phase transitions of heliconical smectic-C and heliconical nematic phases in banana-shaped liquid crystals

引用

Physical Review E 2020年第5期101卷 050701(R)-050701(R)页

作者： Akihiko Matsuyama Department of Physics and Information Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka 820-8502 Japan

A mean-field theory is introduced to describe heliconical nematic (NTB), heliconical smectic-C (SmCTB), and biaxial heliconical smectic-C (SmCTB,b) phases with mirror symmetry breaking. We extend our previous theories of the NTB phase to the heliconical smectic-C phases, by taking into account one-dimensional spatial ordering of smectic layers. The calculated phase diagrams on the temperature–alkyl chain length plane show a rich variety of phase transitions: first- and second-order NTB−SmCTB transitions, etc., including tricritical, tetracritical, and multicritical points. Our theory is qualitatively consistent with an experimental phase diagram.

关键词： Liquid crystal phase transitions Biaxial liquid crystals Liquid crystals Smectic liquid crystals

来源：评论

学校读者我要写书评

暂无评论

Secondary spin current driven efficient THz spintronic emitters

arXiv

引用

arXiv 2022年

作者： Agarwal, Piyush Yang, Yingshu Medwal, Rohit Asada, Hironori Fukuma, Yasuhiro Battiato, Marco Singh, Ranjan Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore639798 Singapore Department of Physics Indian Institute of Technology Uttar Pradesh Kanpur208016 India Department of Electronic Devices and Engineering Graduate School of Science and Engineering Yamaguchi University Ube755-8611 Japan Department of Physics and Information Technology Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka820-8502 Japan

Femtosecond laser-induced photoexcitation of ferromagnet (FM)/heavy metal (HM) heterostructures have attracted attention by emitting broadband terahertz frequencies. The phenomenon relies on the formation of ultrafast spin current, which is largely attributed to the direct photoexcitation of the FM layer. However, we reveal that during the process, the FM layer also experiences a secondary excitation led by the hot electrons from the HM layer that travel across the FM/HM interface and transfer additional energy in the FM. Thus, the generated secondary spins enhance the total spin current formation and lead to amplified spintronic terahertz emission. The results also emphasize the significance of the secondary spin current, which even exceeds the primary spin currents when FM/HM heterostructures with thicker HM are used. An analytical model is developed to provide deeper insights into the microscopic processes within the individual layers, underlining the generalized ultrafast superdiffusive spin-transport mechanism. Copyright © 2022, The Authors. All rights reserved.

关键词： Hot electrons

来源：评论

学校读者我要写书评

暂无评论

Room temperature charge-to-spin conversion from q-2DEG at SrTiO3-based interfaces

arXiv

引用

arXiv 2022年

作者： Shashank, Utkarsh Deka, Angshuman Fukuma, Yasuhiro Ye, Chen Wang, X. Renshaw Gupta, Surbhi Rawat, Rajdeep Singh Medwal, Rohit Asada, Hironori Department of Physics and Information Technology Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka820-8502 Japan Birck Nanotechnology Center School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Research Center for Neuromorphic AI hardware Kyushu Institute of Technology Kitakyushu808-0196 Japan School of Physical and Mathematical Sciences Nanyang Technological University 637616 Singapore School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore Natural Science and Science Education National Institute of Education Nanyang Technological University 637616 Singapore Department of Physics Indian Institute of Technology Kanpur Kanpur208016 India Graduate School of Sciences and Technology for Innovation Yamaguchi University 2-16-1 Tokiwadai Ube755-8611 Japan

Interfacial two-dimensional electron gas (2DEG), especially the SrTiO3-based ones at the unexpected interface of insulators, have emerged to be a promising candidate for efficient charge-spin current interconversion. In this article, to gain insight into the mechanism of the charge-spin current interconversion at the oxide-based 2DEG, we focused on conducting interfaces between insulating SrTiO3 and two types of aluminium-based amorphous insulators, namely SrTiO3/AlN and SrTiO3/Al2O3, and estimated their charge-spin conversion efficiency, θcs. The two types of amorphous insulators were selected to explicitly probe the overlooked contribution of oxygen vacancy to the θcs. We proposed a mechanism to explain results of spin-torque ferromagnetic resonance (ST-FMR) measurements and developed an analysis protocol to reliably estimate the θcs of the oxide based 2DEG. The resultant θcs/t, where t is the thickness of the 2DEG, were estimated to be 0.244 nm-1 and 0.101 nm-1 for the SrTiO3/AlN and SrTiO3/Al2O3, respectively, and they are strikingly comparable to their crystalline counterparts. Furthermore, we also observe a large direct current modulation of resonance linewidth in SrTiO3/AlN samples, confirming its high θcs and attesting an oxygen-vacancy-enabled charge-spin conversion. Our findings emphasize the defects' contribution to the charge-spin interconversion, especially in the oxide-based low dimensional systems, and provide a way to create and enhance charge-spin interconversion via defect engineering. Copyright © 2022, The Authors. All rights reserved.

关键词： Aluminum compounds

来源：评论

学校读者我要写书评

暂无评论

Ferroelectric-Photovoltaic and Optoelectronic-Sensing Response to Substitution engineering of Spin Casted BiFeO3 Thin Films

Ferroelectric-Photovoltaic and Optoelectronic-Sensing Respon...

引用

IEEE International Conference on Plasma science (ICOPS)

作者： Surbhi Gupta Rohit Medwal Rajdeep Singh Rawat School of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan Natural Science and Science Education National Institute of Education Nanyang Technological University Singapore

ISBN: (纸本)9781728153087

Ferroelectric-photovoltaic and photo-detection devices, engaging perovskite oxide families such as Pb(Zr, Ti)O 3 , BaTi O3 , BiFeO 3 (BFO) etc. are continuously researched in past decades to possibly shrink, the fabrication cost of transducers and sensors owing to abundance and easy large sheet-area synthesis to compete with existing Si-based technology [1]. Since BFO exhibits small band gap of 2.2-2.7eV in visible spectrum and large ferroelectric polarization $(\sim 90\ \mu \mathrm{C}/\text{cm}^{2})$ , it is more advantageous over lead based ferroelectrics oxides having relatively large band gap typically (∼ 3.5 eV) in ultraviolet region for harnessing energy. In addition, BFO also favors multifunctional operation, thanks to magneto-optic and photo-striction effect that intriguing applications of photo-driven remote control BFO-based wireless devices, actuators, opto-mechanical micro/nano systems are also envisioned.

关键词： Wireless communication Wireless sensor networks Transducers Photonic band gap Magnetooptic devices Perovskites Sensors

来源：评论

学校读者我要写书评

暂无评论

Theoretical framework for computational story blending: From a cognitive system perspective 10

Theoretical framework for computational story blending: From...

引用

10th International Conference on Computational Creativity, ICCC 2019

作者： Akimoto, Taisuke Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan

ISBN: (纸本)9789895416011

The objective of this study is to design a general computational model of story creativity as the fundamental component of a cognitive system. In this paper, a theoretical framework for computational story blending is presented. This framework is inspired by cognitive and computational models of conceptual blending. Story blending, which is defined as composing a novel story by combining two input stories, is a fundamental principle of story creativity. Although the idea proposed in this paper has not been implemented yet, this study provides a theoretical basis for a computational modeling of story blending. © ICCC 2019.

关键词： Blending

来源：评论

学校读者我要写书评

暂无评论

An asynchronous P system with branch and bound for solving the knapsack problem

An asynchronous P system with branch and bound for solving t...

引用

International Symposium on Computing and Networking Workshops (CANDARW)

作者： Yoshikata Nakano Akihiro Fujiwara Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan

ISBN: (数字)9781728199191

ISBN: (纸本)9781728189314

Membrane computing, which is a computational model based on cell activity, has considerable attention as a new computation paradigm. In general membrane computing, computationally hard problems have been solved in a polynomial number of steps using an exponential number of membranes. However, reduction of the number of membranes must be considered in order to make a P system a more realistic *** the present paper, we propose an asynchronous P system for the 0/1 knapsack problem using branch and bound, which is a well-known optimization technique. The proposed P system solves the knapsack problem with n items and works in O(n2 n ) sequential steps or O(n 2 ) parallel *** addition, the numbers of membranes used in the proposed P system are evaluated by computational simulation. The experimental results show the validity and efficiency of the proposed P system.

关键词： Computational modeling Conferences Optimization

来源：评论

学校读者我要写书评

暂无评论

An asynchronous P system for counting sort

An asynchronous P system for counting sort

引用

International Symposium on Computing and Networking Workshops (CANDARW)

作者： Kosei Nagao Akihiro Fujiwara Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan

ISBN: (数字)9781728199191

ISBN: (纸本)9781728189314

Membrane computing, which is a computational model based on cell activity, has attracted considerable attention as a new paradigm in computation. Using membrane computing, several algorithms for elementary operations, such as sorting, have been proposed. However, the proposed algorithms for sorting in membrane computing have different types of inputs. In addition, there is room for improvement on the complexities of the proposed algorithms. In the present paper, we propose an asynchronous P system based on counting sort for inputs representing binary numbers. The proposed P system sorts n binary numbers of m bits in O(mn 2 ) sequential steps and O(mn) parallel steps.

关键词： Conferences Computational modeling Complexity theory Sorting

来源：评论

学校读者我要写书评

暂无评论

Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt

arXiv

引用

arXiv 2022年

作者： Shashank, Utkarsh Nakamura, Yoji Kusaba, Yu Tomoda, Takafumi Nongjai, Razia Kandasami, Asokan Medwal, Rohit Rawat, Rajdeep Singh Asada, Hironori Gupta, Surbhi Fukuma, Yasuhiro Department of Physics and Information Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka820-8502 Japan Materials Science Division Inter University Accelerator Centre Aruna Asaf Ali Marg New Delhi110067 India Uttarakhand Dehradun248007 India Department of Physics Indian Institute of Technology Kanpur Kanpur208016 India Natural Sciences and Science Education National Institute of Education Nanyang Technological University 637616 Singapore Graduate School of Sciences and Technology for Innovation Yamaguchi University 2-16-1 Tokiwadai Ube755-8611 Japan Research Center for Neuromorphic AI hardware Kyushu Institute of Technology Kitakyushu808-0196 Japan

The rapidly evolving utilization of spin Hall effect (SHE) arising from spin-orbit coupling in 5d transition metals and alloys have made giant strides in the development of designing low-power, robust and non-volatile magnetic memory. Recent studies, on incorporating non-metallic lighter elements such as oxygen, nitrogen and sulfur into 5d transition metals, have shown an enhancement in damping-like torque efficiency θDL due to the modified SHE, but the mechanism behind this enhancement is not clear. In this paper, we study θDL at different temperatures (100-293 K) to disentangle the intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt. We observe a crossover of intrinsic to extrinsic side-jump mechanism as the implantation dose increases from 2×1016 ions/cm2 to 1×1017 ions/cm2. A sudden decrease in the intrinsic spin Hall conductivity is counterbalanced by the increase in the side-jump induced SHE efficiency. These results conclude that studying θDL as a function of implantation dose, and also as a function of temperature, is important to understand the physical mechanism contributing to SHE, which has so far been unexplored in incorporating non-metallic element in 5d transition metals. Copyright © 2022, The Authors. All rights reserved.

关键词： Spin Hall effect

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：