检索结果-内蒙古大学图书馆

Gene expression feature selection for prostate cancer diagnosis using a two-phase heuristic-deterministic search strategy

引用

IET SYSTEMS BIOLOGY 2018年第4期12卷 162-169页

作者： Shahbeig, Saleh Rahideh, Akbar Helfroush, Mohammad Sadegh Kazemi, Kamran Shiraz Univ Technol Dept Elect & Elect Engn Shiraz Iran

Here, a two-phase search strategy is proposed to identify the biomarkers in gene expression data set for the prostate cancer diagnosis. A statistical filtering method is initially employed to remove the noisiest data. In the first phase of the search strategy, a multi-objective optimisation based on the binary particle swarm optimisation algorithm tuned by a chaotic method is proposed to select the optimal subset of genes with the minimum number of genes and the maximum classification accuracy. Finally, in the second phase of the search strategy, the cache-based modification of the sequential forward floating selection algorithm is used to find the most discriminant genes from the optimal subset of genes selected in the first phase. The results of applying the proposed algorithm on the available challenging prostate cancer data set demonstrate that the proposed algorithm can perfectly identify the informative genes such that the classification accuracy, sensitivity, and specificity of 100% are achieved with only nine biomarkers.

关键词： Feature extraction Prostate Cancer NUMB gene Genes second phase search strategies Biological Markers selection algorithm

来源：评论

学校读者我要写书评

暂无评论

Adaptive Waveform selection for Multistatic Target Tracking

引用

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2015年第1期51卷 688-701页

作者： Ngoc Hung Nguyen Dogancay, Kutluyil Davis, Linda M. Univ S Australia Inst Telecommun Res Mawson Lakes SA 5095 Australia Univ S Australia Sch Engn Mawson Lakes SA 5095 Australia

This paper studies the problem of adaptive waveform selection for target tracking by a multistatic radar system consisting of a dedicated transmitter and multiple receivers. The transmitted waveforms are selected to minimize the tracking mean square error by minimizing a tracking cost function obtained using the Cramer-Rao lower bound of radar estimates. The superior performance of the proposed adaptive waveform selection algorithm over conventional waveforms is illustrated with simulation examples.

关键词： Multiple Receiver waveforms Target tracking Radar systems Cost functions multistatic radar radar selection algorithm Mean square error Self tuning

来源：评论

学校读者我要写书评

暂无评论

A Fair Opportunistic Relaying algorithm Using an Adaptive selection Region in Cooperative Networks

A Fair Opportunistic Relaying Algorithm Using an Adaptive Se...

引用

European Wireless 2016;22th European Wireless Conference

作者： Mohammad Mahdi Azari Sofie Pollin Fernando Rosas Behrouz Maham Xiangyun Zhou

This work proposes a new relay selection algorithm in an opportunistic cooperative network, which aims to establish fairness among the users. Our approach provides the same overall outage probability for users at different locations. To this end, we first define a selection region containing Amplify-and-Forward (AF) relays with a superior channel quality. Then, opportunistic relay selection from the region is applied. The fairness is achieved by adapting the size of the selection region according to the user location. Our analytical result provides a guideline to implement the proposed relay selection algorithm at each user.

关键词： selection algorithm relay adaptive selection Consumers relaying Region

来源：评论

学校读者我要写书评

暂无评论

Landing Site selection Using a Geometrically Conforming Footprint on Hazardous Small Bodies

引用

JOURNAL OF SPACECRAFT AND ROCKETS 2022年第3期59卷 889-899页

作者： Nelson, Joshua D. Schaub, Hanspeter Univ Colorado Ann & HJ Smead Dept Aerosp Engn Sci Boulder CO 80309 USA Univ Colorado Ann & HJ Smead Dept Aerosp Engn Sci Engn Boulder CO 80309 USA

In recent years there has been a great deal of research and development pertaining to the landing of spacecraft on small bodies, such as asteroids. The capabilities to identify and avoid large rocks and other hazards on the surface of small bodies have seen significant improvement. However, many current techniques search for a location on the surface that contains no hazards within a scaled square, circular, or elliptical footprint. A challenge with this approach on asteroids with highly hazardous terrain is that such acceptable landing locations may be few and far between, or may not even exist at all. This paper proposes the use of a geometrically conforming footprint to significantly widen possible landing regions. An optimization technique that uses such a noncircular/elliptical footprint is formulated for a landing location selection algorithm. Coarse and fine variations for determining a landing location are developed and compared for their landing site selection performance as well as their computational effort. The algorithms to find a landing pose close to some desired landing location are constructed assuming a polygonal model of the lander and the obstacle regions. Numerical simulations illustrate the advantages of the geometrically conforming footprint over a circular one. Further, while the fine search algorithm shows better results in placing the lander close to an obstacle, the coarse search algorithm shows comparatively strong results with significantly less computational effort.

关键词： Asteroids Search algorithm selection algorithm Numerical Simulation Autonomous Landing Hazard Avoidance Technology Python Brute Force Search Quadratic Programming Embedded Systems LIDAR Sensor

来源：评论

学校读者我要写书评

暂无评论

INPUT selection FOR A 2ND-ORDER MASS PROPERTY ESTIMATOR

引用

JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 1988年第3期11卷 207-212页

作者： RICHFIELD, RF WALKER, BK BERGMANN, EV UNIV CINCINNATI DEPT AERONAUT ENGN & ENGN MECH CINCINNATI OH 45221 USA CHARLES STARK DRAPER LAB INC CAMBRIDGE MA 02139 USA

A strategy is developed for selecting online the attitude control jet firings to be commanded during the mass property estimation phase of the operation of any asymmetrical rigid satellite. Using symbolic manipulation, an effort is made to develop a selection stratgegy that accelerates convergence by maximally decreasing the change in the covariance of the estimation error at each time step. These results, which are too complex for online implementation, motivate a suboptimal direct search stragegy. Examples of mass property identification are then demonstrated on a high-fidelity simulation of the Space Shuttle. The results indicate that the suboptimal strategies yield significant reductions in the time to convergence for the mass property estimates and in the cumulative fuel usage relative to a typical predetermined jet firing sequence. © 1988 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.

关键词： Space Shuttle Attitude Control System Satellites Fuel Consumption selection algorithm Reaction Control System Flight Computer Autopilot Flight Control System Space Shuttle Orbiter

来源：评论

学校读者我要写书评

暂无评论

A routing cooperative selection method based on ant colony optimization algorithm

A routing cooperative selection method based on ant colony o...

引用

International Conference on Cyberspace Technology (CCT 2014)

作者： Sun Dandan Zhang Hongxin School of Electronic Engineering Beijing University of Posts and Telecommunications 100876 China Sch. of Electron. Eng. Beijing Univ. of Posts & Telecommun. Beijing China

ISBN: (纸本)9781510802704

Cooperative routing selection algorithm is based on the limited bandwidth and collaborative remain energy, according to pheromone concentration in Ant colony optimization algorithm. The ant colony optimization algorithm is applied to improving collaboration network routing problems to reduce network congestion and reduce node energy consumption. Simulation demonstrate that the algorithm obtains a global optimization and makes an average 60% reduction in end to end delay, increased the utilization of network resources.

关键词： Ant colony optimization algorithm Pheromone density The Cooperative routing ant algorithm Ant colony optimization Network routing Web resources Optimization algorithms Network Congestion selection algorithm Global optimization algorithms selection methods node energy

来源：评论

学校读者我要写书评

暂无评论

Winning at the Starting Line: Unreliable Data Replica selection for Edge Data Integrity Verification

引用

IEEE TRANSACTIONS ON SERVICES COMPUTING 2024年第6期17卷 4481-4493页

作者： Zhao, Yao Qu, Youyang Xiang, Yong Chen, Feifei Uddin, Md Palash Gao, Longxiang Deakin Univ Sch Informat Technol Burwood Vic 3125 Australia Qilu Univ Technol Minist Educ Shandong Acad Sci Shandong Comp Sci CtrKey Lab Comp Power Network & Jinan 250353 Peoples R China Shandong Fundamental Res Ctr Comp Sci Shandong Prov Key Lab Comp Power Internet & Serv C Jinan 250353 Peoples R China

Mobile Edge Computing (MEC) is an emerging technology, where App vendors are allowed to cache multiple data replicas on geographically distributed edge servers to serve adjacent mobile subscribers. However, this benefit introduces an extra workload for edge servers and App vendors, as they must audit the integrity of multiple data replicas periodically considering various threats caused by distributed and dynamic MEC environments. The large-scale growth of data replicas certainly is a challenge to design more efficient Edge Data Integrity (EDI) verification approaches. Existing solutions are mostly limited to improving efficiency by optimizing proof generation and verification methods, while the improvement is still far from satisfactory due to adopting indiscriminate inspection philosophy (checking all data replicas without discrimination). In this paper, we make the first attempt to abstract a pre-processing phase and correspondingly study the Unreliable data Replica selection (URS) problem. It can be seamlessly integrated into existing EDI solutions by solving the URS problem at the start of each verification round. Such pre-selection can significantly enhance overall EDI verification efficiency by incorporating the cache service Quality of Service (QoS) and verification success rate, especially in scenarios with a large number of data replicas. Specifically, we first formalize the URS problem as a constrained optimization problem, and further prove its NP -hardness. To address the problem efficiently, we transform it into an easy-to-handle form and develop a Priority-based approach named URS-P. Both theoretical analysis and experimental evaluation validate the effectiveness and efficiency of our proposed solution.

关键词： Quality of service Servers Distributed databases Inspection Monitoring Data integrity Optimization Real-time systems Accuracy Vehicle safety Edge data integrity optimization selection algorithm submodular function unreliable data replica

来源：评论

学校读者我要写书评

暂无评论

Tractable Goal selection for Embedded Systems with Oversubscribed Resources

引用

JOURNAL OF AEROSPACE COMPUTING INFORMATION AND COMMUNICATION 2011年第5期8卷 151-169页

作者： Rabideau, Gregg Chien, Steve McLaren, David CALTECH Jet Prop Lab Artificial Intelligence Grp Pasadena CA 91109 USA

We describe an efficient, online goal selection algorithm and its use for selecting goals at runtime. Our focus is on the replanning that must be performed in a timely manner on the embedded system where computational resources are limited (as in many aerospace systems). In particular, our algorithm generates near optimal solutions to problems with fully specified goal requests that can oversubscribe available resources but have no temporal flexibility. By using a fast, incremental algorithm, goal selection can be postponed in a "just-in-time" fashion allowing requests to be changed or added at the last minute. This enables shorter response cycles and greater autonomy for the system under control. We show that the average case complexity for updating the goals set is O(N IgN) and runtime execution isO(N). We perform an empirical analysis on both synthetic data and space operations mission-like scenarios that confirm these performance characteristics. Finally, we show that scaling these performance figures to existing, very limited onboard spacecraft embedded environments (a Mars Reconnaissance Orbiter like environment) appears feasible.

关键词： Embedded Systems selection algorithm Space Operations Aerospace System Mars Exploration Rover Earth Flight Computer Data Storage C++ Programming Language Spitzer Space Telescope

来源：评论

学校读者我要写书评

暂无评论

selection-based capacitor voltage balancing control for modular multilevel converters

引用

JOURNAL OF POWER ELECTRONICS 2021年第10期21卷 1427-1438页

作者： Luo, Wei Ma, Yifan Zheng, Changbao Univ Shanghai Sci & Technol Dept Elect Engn Shanghai Peoples R China Anhui Univ Collaborat Innovat Ctr Ind Energy Saving & Power Hefei Anhui Peoples R China

The modular multilevel converter (MMC) is a promising topology for high-power converters. The capacitor voltage balancing method for the submodules (SMs) is one of the key technologies in terms of modular multilevel converters. Aiming at the problems of the large calculation burden and the high switching frequency in the traditional capacitor voltage balancing method, an improved balancing method based on a novel selection algorithm for MMCs is proposed in this paper. The proposed method can avoid the sorting operation of the arm SM voltages in each control cycle without reducing the control precision of the capacitor voltages. In addition, it greatly improves the sorting efficiency. Thus, a criterion for algorithm rerun is introduced, which makes the MMC controller avoid reordering the capacitor voltages and leave the control signals unchanged when the capacitor voltages experience small changes. Finally, simulation and experimental results confirm the feasibility and effectiveness of the proposed method.

关键词： Modular multilevel converter (MMC) Capacitor voltage balancing selection algorithm Hardware-in-the-loop simulation

来源：评论

学校读者我要写书评

暂无评论

Study on selection of Test Space for CW Illuminator

引用

IEICE TRANSACTIONS ON COMMUNICATIONS 2022年第11期E105B卷 1434-1443页

作者： Zhou, Qi Zhou, Zhongyuan Gu, Yixing Sheng, Mingjie Hu, Peng Xiao, Yang Southeast Univ Sch Mech Engn Electromagnet Compatibil Lab Nanjing 211189 Peoples R China

This paper introduces the working principle of continuous wave (CW) illuminator and selects the test space by developing the wave impedance selection algorithm for the CW illuminator. For the vertical polarization and the horizontal polarization of CW illuminator, the law of wave impedance distribution after loading is analyzed and the influence of loading distribution on test space selection is studied. The selection principle of wave impedance based on incident field or total field at the monitoring point is analyzed.

关键词： CW illuminator selection algorithm distribution design test space

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：