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检索条件"主题词=software algorithms"

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Towards Adaptive Beamforming in Indoor Wireless Networks: An Experimental Approach

Towards Adaptive Beamforming in Indoor Wireless Networks: An...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： S. Lakshmanan K. Sundaresan R. Kokku A. Khojestepour S. Rangarajan School of ECE Georgia Institute of Technology USA NEC Laboratories of America Inc. Princeton USA

ISBN: (纸本)9781424435128

Several research works have argued that adaptive beamforming has the potential to realize the high spectral efficiency requirements of next-generation wireless standards, and is especially well-suited for multipath-rich environments such as indoors. Most works have been limited to theory; few works in literature address the practical benefits and realizability of adaptive beamforming. In this paper, we design and implement the first indoor WLAN beamforming system with multi-element array antennas and software radio platforms, that forms a testbed for exploration of practical benefits of beamforming, and evaluation of algorithms for efficient beamforming in diverse environments. In the process of building the system, we identify and address several challenges with practical beamforming that are often ignored in theoretical works. Most importantly, channel estimation for forming the best beam to a user is hindered by oscillator drifts on the transmitter and receiver side that introduce hard-to-isolate phase and frequency offsets from the estimated channel coefficients. We describe these issues and incorporate novel solutions in our system to address them without requiring hardware modifications. We use the system to demonstrate the realizable benefits of adaptive beamforming in a typical indoor office environment.

关键词： Array signal processing Wireless networks Frequency estimation Algorithm design and analysis Wireless LAN Antenna arrays software radio software testing System testing software algorithms

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Blocking effect reduction in low bitrate video on a mobile platform

Blocking effect reduction in low bitrate video on a mobile p...

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IEEE International Conference on Image Processing

作者： A. Petrov T. Kartalov Z. Ivanovski Netcetera Skopje Macedonia Faculty of Electrical Engineering Skopje Macedonia

The paper presents a new algorithm for blocking artifacts reduction in low bit rate video. The algorithm addresses the blocking effect on block boundaries, as well as the one inside the blocks. The algorithm works with variety of coding schemes, and does not exploit any information from the coded bitstream. It has extremely low complexity and it is designed to work on a mobile platform in real time. It incorporates two parts: artifacts detection procedure, which decides whether the processing is required for the particular location in the video frame, and artifacts reduction procedure, which performs the actual filtering depending on local image characteristics. The experiments confirm the algorithms effectiveness, as well as its low computational complexity.

关键词： Bit rate Video compression Video sharing Filtering algorithms Image coding Decoding Pixel Image edge detection Mobile computing software algorithms

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SBST challenges from the perspective of the test techniques

SBST challenges from the perspective of the test techniques

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Conference on Information and Knowledge Technology

作者： Sepideh Kashefi Gargari Mohammd Reza Keyvanpour Faculty of Engineering Alzahra University Tehran Iran

ISBN: (纸本)9781665408509

Despite several decades of working on software quality assurance methods, they still require further investigations. In this regard, it is of paramount importance to detect a process detecting possible software errors with minimum budget and efforts. Search-based software testing(SBST) is an approach to automated software testing and aims to find a suitable alternative to manual testing. SBST is to transform the test problem into an optimization problem and obtain better solutions by searching the problem space. Search-based testing has some disadvantages and advantages. In this paper, considering the significance of SBST in testing, the search-based test challenges were detected from the perspective of the test techniques. This study also suggests different research subjects and provides a guideline for researchers interested in SBST as such the results can be used to compare the existing test techniques, select the best one, and represent the challenges of each technique.

关键词： software testing software algorithms Transforms software quality Manuals Search problems Optimization

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Recording complex patient data in the EP-laboratory using cross reference algorithm

Recording complex patient data in the EP-laboratory using cr...

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Computers in Cardiology (CinC)

作者： O. Merl R. Peschorn F. Freihoff W. Kaltenbrunner U. Eidher K. Steinbach Ludwig Boltzmann Institute for Arrhythmia Research Vienna Austria

Patients admitted for EP studies naturally compile complex data. Especially patients admitted for multiple arrhythmogenic substrates are challenging to record initially and follow up afterwards. We have developed a software tool to record clinical data including ***, pretest diagnosis, basic EP values, invasive diagnostic as well as interventional data and patient clinical and invasive follow up with an intuitive entry algorithm. Data management is done online in local area network PC-environment. Data input is done in a graphical user environment with automatic pulldown menus, choice algorithms and dialogue. Relevant choice lists comply with ACC/AHA guidelines. Within 58 months of its full operation a total of 1072 EP sessions were performed on 780 patients. Within these sessions 768 arrhythmia substrates were found With 55pts (7%) no arrhythmogenic substrate was found; 682pts (87%) had single substrate, 39pts (5%) had double substrate; 4pts (0,5%) had multiple substrates. Among secondary substrates we found 14 [32%] AFib, 6 [14%] AVNRT, 5 [11%] AFlu, 15 [35%] mono AT, 4 [9%] VT) The database is in clinical use demonstrating its advantages over conventional documentation techniques. We believe that cross reference evaluation of clinical EP-data can only be managed using specially designed easy to use computer based software, which is well structured to avoid redundant data entry.

关键词： Workstations software tools History Guidelines Databases Electrophysiology Local area networks MONOS devices Documentation software algorithms

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Hyperparameter selection for reliable EEG denoising using ASR: a benchmarking study

Hyperparameter selection for reliable EEG denoising using AS...

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IEEE International Conference on Bioinformatics and Biomedicine (BIBM)

作者： Velu Prabhakar Kumaravel Marco Buiatti Elisabetta Farella Digital Society (DigiS) Fon-dazione Bruno Kessler Italy Center for Mind/Brain Sciences (CIMeC) University of Trento Italy

ISBN: (纸本)9781665429825

Artifacts preprocessing in EEG is remarkably significant to extract reliable neural responses in the downstream analysis. A recently emerging powerful preprocessing tool among the EEG community is Artifacts Subspace Reconstruction (ASR). ASR is an unsupervised machine learning algorithm to identify and correct the transient-like non-stationary noisy samples. ASR is fully automatic, therefore, suitable for online applications. However, the performance of ASR is strongly dependent on the user-defined hyperparameter k. A poor choice of k might lead to severe performance *** this work, we benchmark the performance of ASR against its parameter k. Toward this goal, we used the Temple University Hospital EEG Artifact Corpus (TUAR), which consists of 310 EEG files recorded in clinical settings from epileptic patients. Remarkably, these files are annotated for artifacts by trained personnel with a high inter-rater agreement score (κ > 0.8). Considering these reliable labels as ground truth, ASR has shown the best performance in artifacts cleaning with k ranging between 20 and 40.

关键词： software algorithms Benchmark testing Electroencephalography Distance measurement Cleaning software software reliability

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Optimization Algorithm Design of Low Cost Location in Hub Airport Terminal

Optimization Algorithm Design of Low Cost Location in Hub Ai...

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Chinese Automation Congress (CAC)

作者： Liming Bai Huimin Cai Linguo Chai Haojie Pang Jian Xing Beijing Capital International Airport Co. Ltd. Beijing China Beijing Jiaotong University Beijing China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

At present, the civil aviation industry is developing rapidly. With the rapid growth of transportation business and the continuous expansion of domestic airport scale, the demand for location service to provide accurate positioning for passengers is increasing. Combined with the Bluetooth signal transmission characteristics in the terminal, a fusion location algorithm based on EKF is designed to improve the continuity of passenger positioning results. Combined with the dense flow of people and different paths, a map matching fusion localization algorithm based on particle filter is designed to further improve the positioning accuracy. In the development environment, the positioning software of hub airport terminal is designed and implemented. The experimental verification and result analysis of the proposed algorithm are carried out.

关键词： Bluetooth Airports Buildings Mathematical model software algorithms Location awareness Distance measurement

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Applications of Artificial Bee Colony Optimization technique: Survey

Applications of Artificial Bee Colony Optimization technique...

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International Conference on Computing for Sustainable Global Development (INDIACom)

作者： Kuldeep Singh Kaswan Sunita Choudhary Kapil Sharma Department of Computer Science Banasthali University Banasthali Rajasthan INDIA Department of Computer Science & Engineering Delhi Technological University Delhi INDIA

ISBN: (纸本)9781479968329

In this paper, an overviews of different application areas are discussed, where the Artificial Bee Colony (ABC) optimization algorithm has applied. Artificial bee colony was introduced by Karabora in 2005. It was developed to solve real parameter optimization problem. BCO's (Bee Colony Optimization) foraging behavior is simulated in artificial bee colony. This system portraying organized team-work well coordinated interaction, labor division, simultaneous task performance and well-knit communication.

关键词： Optimization Algorithm design and analysis Clustering algorithms Benchmark testing software algorithms Prediction algorithms Heuristic algorithms

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Performance Study of Catmull-Clark Subdivision Surfaces Algorithm

Performance Study of Catmull-Clark Subdivision Surfaces Algo...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Ali J. Ghandour Walid J. Ghandour Hassan Diab Ahmad Nasri National Council for Scientific Research Beirut Lebanon Lebanese University Beirut Lebanon Beirut Lebanon

ISBN: (数字)9781728131290

ISBN: (纸本)9781728131306

Generating smooth surfaces of arbitrary topology is a major challenge in geometric modeling, computer graphics, and scientific visualization. Subdivision surfaces have emerged as a powerful and useful technique in modeling free-form surfaces. Recursive subdivision techniques generate visually pleasing smooth surfaces through the repeated application of a fixed set of subdivision rules. Given a control mesh, a Catmull-Clark Subdivision Surface (CCSS) is generated by iteratively refining (subdividing) the control mesh to form new control meshes. CCSS implementations do not perform well and suffer from low CPU utilization because they are often waiting for data to be transferred from memory due to the repeated pointer indirections. Rapid Evaluation of CCSS is an approach that focuses on achieving maximum performance by carefully addressing caching issues. However, this approach is designed with primary target being single core machines. In this paper, we implement the Rapid Evaluation of Catmull-Clark Subdivision Surfaces (RECCSS) algorithm in C++ and measure its achieved performance. We then redesign RECCSS to leverage the potential of parallel computation on widely available multicores machines and show that Parallelized RECCSS (PRECCSS) achieves noticeable speedup when run on diverse set of machines compared to the original RECCSS implementation. In addition, we conduct a study about the data value predictability of PRECCSS load instructions using Pin dynamic binary instrumentation tool, and conclude that 93.25% prediction accuracy can be achieved with existing value prediction techniques.

关键词： Surface treatment software algorithms Instruction sets Topology Computational modeling Multicore processing C++ languages

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Data clustering by ant colony on a digraph

Data clustering by ant colony on a digraph

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Ling Chen Li Tu Hong-Jian Chen National Key Laboratory of Novel Software Tech Nanjing University Nanjing China Department of Computer Science Yangzhou University Yangzhou China

An adaptive data clustering algorithm based on ant colony (ant-cluster) is presented. Enlightened by the self-organizing behavior of ant society, we assign acceptance rates on the directed edges of a pheromone digraph in ant-cluster system. The pheromone on the edges of the digraph is adaptively updated by the ants passing it. Some edges with less pheromone are progressively removed under a list of certain thresholds in the process. Strong connected components of the final digraph are extracted as clusters. The performance of ant-cluster is compared with classical K-means clustering algorithm and ACO clustering algorithm LF in terms of clustering quality and efficiency on several real datasets and clustering benchmarks. Experimental results indicate that the ant-cluster is able to find clusters faster with better clustering quality and is easier to implement than K-means and LF.

关键词： Clustering algorithms Ant colony optimization Particle swarm optimization Cadaver Computer science software algorithms Testing DNA Birds Marine animals

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Multi-component in fermentation online detection flow path control system based on novel enzyme electrode

Multi-component in fermentation online detection flow path c...

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Chinese Automation Congress (CAC)

作者： Shilin Yang Shubo Jiang Yiqing Wang Lin Wang Jun Li Cuimei Bo College of Electrical Engineering and Control Science Nanjing Tech University Nanjing China

ISBN: (纸本)9781665426480

Focus on the problem of multi-component in-situ on-line monitoring in fermentation, in this work, we proposed an on-line in-situ multi-channel detection flow path control system based on a novel enzyme electrode prepared from Prussian Blue (PB) nanomaterials. To match the detection behavior of this electrode, an innovative design of a multi-channel pump-valve synergistic flow path control system can effectively reduce cross-contamination and improve system reliability. According to the flow path detection logic requirements, software program modules, such as precise positioning and micro-injection of pipette needle, and calibration detection during the multi-component detection process, have been developed. Precise positioning and micro-injection of pipette needle were realized by the trapezoidal acceleration and deceleration algorithm combined with a subdivision drive circuit. For the continuous change glucose concentration in fermentation, an adaptive sampling strategy of the injection volume and calibration detection module were proposed to realize multi-component, wide-range from 1g/L to 180g/L, fast and accurate detection, which presenting the as-prepared in-situ on-line system was proved to exhibits a high accuracy with a low detection error (<2%) within the linear range.

关键词： Electrodes software algorithms Programming Control systems Needles Biochemistry software

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