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Developing a Massive open Online Lab Course for Learning Principles of Communications

Developing a Massive Open Online Lab Course for Learning Pri...

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ieee International conference on Teaching, Assessment, and Learning for Engineering (ieee TALE)

作者： Xu, Zhengguang Chen, Wan Qu, Daiming Hei, Xiaojun Li, Wei Huazhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan Peoples R China Wuhan Easy Start Technol Co Ltd Res Ctr Wuhan Peoples R China

ISBN: (纸本)9781728169422

The course of Principles of Communications involves a wide range of know ledge and is both theoretical and practical. It is difficult for beginners to closely link theory with practice. Therefore, it is necessary to consolidate theoretical teaching results through experiments. The traditional experimental teaching of Principles of Communications is to let students go to the laboratory and carry out experiments by programming on software radio hardware. However, during the COVID-19 pandemic period, students are unable to conduct experiments in the laboratory, so online experiments become the only feasible scheme. This paper introduces an online experiment scheme, compares the online scheme with lab experiments. The online experiment system has been used in one class of 28 students and the positive rate of the system from the students is 86%.

关键词： principles of communications software defined radio online experimental teaching

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On Grid Partitioning in AC Optimal Power Flow 10

On Grid Partitioning in AC Optimal Power Flow

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10th ieee PES Innovative Smart Grid Technologies Europe (ISGT-Europe) - Smart Grids - Key Enablers of a Green Power System

作者： Murray, Alexander Kyesswa, Michael Schmurr, Philipp Cakmak, Hueseyin Hagenmeyer, Veit Karlsruhe Inst Technol Karlsruhe Germany

ISBN: (纸本)9781728171005

The AC optimal power flow problem is known to be highly non-convex and scale very poorly with respect to the number of lines and buses. One possible solution is to subdivide and parallelize the problem through distributed optimization. However, the question of how to optimally partition a power grid for use in distributed optimization remains open in the literature. To this end, we compare the graph partitioners KaFFPa and METIS as well as two spectral clustering methods to the standard ieee 9, 14, 30, 39, 57, 118, 300 bus models. The distributed algorithm ALADIN is used to solve the partitioned OPF problems. For larger grids, KaFFPa yields the best results on average.

关键词： Distributed algorithms Partitioning algorithms Power grids Mathematical programming

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FBNetV2: Differentiable Neural Architecture Search for Spatial and Channel Dimensions

FBNetV2: Differentiable Neural Architecture Search for Spati...

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ieee/CVF conference on Computer Vision and Pattern Recognition (CVPR)

作者： Wan, Alvin Dai, Xiaoliang Zhang, Peizhao He, Zijian Tian, Yuandong Xie, Saining Wu, Bichen Yu, Matthew Xu, Tao Chen, Kan Vajda, Peter Gonzalez, Joseph E. Univ Calif Berkeley Berkeley CA 94720 USA Facebook Inc Menlo Pk CA USA Facebook Menlo Pk CA USA

ISBN: (纸本)9781728171685

Differentiable Neural Architecture Search (DNAS) has demonstrated great success in designing state-of-the-art, efficient neural networks. However, DARTS-based DNAS's search space is small when compared to other search methods', since all candidate network layers must be explicitly instantiated in memory. To address this bottleneck, we propose a memory and computationally efficient DNAS variant: DMaskingNAS. This algorithm expands the search space by up to 10(14)x over conventional DNAS, supporting searches over spatial and channel dimensions that are otherwise prohibitively expensive: input resolution and number of filters. We propose a masking mechanism for feature map reuse, so that memory and computational costs stay nearly constant as the search space expands. Furthermore, we employ effective shape propagation to maximize per-FLOP or per-parameter accuracy. The searched FBNetV2s yield state-of-the-art performance when compared with all previous architectures. With up to 421x less search cost, DMaskingNAS finds models with 0.9% higher accuracy, 15% fewer FLOPs than MobileNetV3-Small;and with similar accuracy but 20% fewer FLOPs than Efficient-B0. Furthermore, our FBNetV2 outperforms MobileNetV3 by 2.6% in accuracy, with equivalent model size. FBNetV2 models are open-sourced at https://***/facebookresearch/mobile-vision.

关键词： network layers

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Escape from Escape Analysis of Golang 42

Escape from Escape Analysis of Golang

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42nd ACM/ieee International conference on Software Engineering - Companion Proceedings (ICSE-Companion) / 42nd ACM/ieee International conference on Software Engineering - Software Engineering in Practice (ICSE-SEIP)

作者： Wang, Cong Zhang, Mingrui Jiang, Yu Zhang, Huafeng Xing, Zhenchang Gu, Ming Tsinghua Univ Sch Software BNRist KLISS Beijing Peoples R China Huawei Technol Compiler & Programming Language Lab Hangzhou Peoples R China Australian Natl Univ Coll Engn & Comp Sci Canberra ACT Australia

ISBN: (纸本)9781450371230

Escape analysis is widely used to determine the scope of variables, and is an effective way to optimize memory usage. However, the escape analysis algorithm can hardly reach 100% accurate, mistakes of which can lead to a waste of heap memory. It is challenging to ensure the correctness of programs for memory optimization. In this paper, we propose an escape analysis optimization approach for Go programming language (Golang), aiming to save heap memory usage of programs. First, we compile the source code to capture information of escaped variables. Then, we change the code so that some of these variables can bypass Golang's escape analysis mechanism, thereby saving heap memory usage and reducing the pressure of memory garbage collection. Next, we present a verification method to validate the correctness of programs, and evaluate the effect of memory optimization. We implement the approach to an automatic tool and make it open-source(1). For evaluation, we apply our approach to 10 open-source projects. For the optimized Golang code, the heap allocation is reduced by 8.88% in average, and the heap usage is reduced by 8.78% in average. Time consumption is reduced by 9.48% in average, while the cumulative time of GC pause is reduced by 5.64% in average. We also apply our approach to 16 industrial projects in Bytedance Technology. Our approach successfully finds 452 optimized cases which are confirmed by developers.

关键词： escape analysis memory optimization code generation go programming language

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IoT Software by Dataflow programming in Mruby programming Environment 20th

IoT Software by Dataflow Programming in Mruby Programming En...

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20th International conference on Computational Science and Its Applications (ICCSA)

作者： Tanaka, Kazuaki Tsujino, Chihiro Maeda, Hiroyuki Kyushu Inst Technol Fukuoka 8208502 Japan

ISBN: (纸本)9783030588113;9783030588106

In IoT software development, a method to implement software by focusing on data flow has been proposed, which is called dataflow programming. On the other hand, sensor devices are generally implemented in microcontrollers with limited resources for compactness, power savings and costs, so sensor devices are not suitable for executing data flow programs. In this paper, an environment running the scripting language mruby is described to execute a dataflow program on a small microcontroller. The execution of the data flow program is performed asynchronously by multiple nodes, which handle the sensor data. The execution environment of a dataflow program must support this style of execution. Since mruby can execute multiple programs concurrently, it is well suited to implement dataflow programs. By generating mruby code from a program developed in Node-RED, one of the popular dataflow programming environments, the mruby program is executed on a single-chip microcontroller, which includes mruby virtual machine.

关键词： IoT Dataflow programming Node-RED Mruby

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Contact-Aware Opportunistic Data Forwarding in Disconnected LoRaWAN Mobile networks 40

Contact-Aware Opportunistic Data Forwarding in Disconnected ...

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40th ieee International conference on Distributed Computing Systems (ICDCS)

作者： Chen, Po-Yu Bhatia, Laksh Kolcun, Roman Boyle, David McCann, Julie A. Imperial Coll London Dept Comp London England Imperial Coll London Dyson Sch Design Engn London England

ISBN: (纸本)9781728170022

LoRaWAN is one of the leading Low Power Wide Area network (LPWAN) architectures. It was originally designed for systems consisting of static sensor or Internet of Things (IoT) devices and static gateways. It was recently updated to introduce new features such as nano-second timestamps which open up applications to enable LoRaWAN to be adopted for mobile device tracking and localisation. In such mobile scenarios, devices could temporarily lose communication with the gateways because of interference from obstacles or deep fading, causing throughput reduction and delays in data transmission. To overcome this problem, we propose a new data forwarding scheme. Instead of holding the data until the next contact with gateways, devices can forward their data to nearby devices that have a higher probability of being in contact with gateways. We propose a new network metric called Real-Time Contact-Aware Expected Transmission Count (RCA-ETX) to model this contact probability in real-time. Without making any assumption on mobility models, this metric exploits data transmission delays to model complex device mobility. We also extend RCA-ETX with a throughput-optimal stochastic backpressure routing scheme and propose Real-Time Opportunistic Backpressure Collection (ROBC), a protocol to counter the stochastic behaviours resulting from the dynamics associated with mobility. To apply our approaches seamlessly to LoRaWAN-enabled devices, we further propose two new LaRaWAN classes, namely Modified Class-C and Queue-based Class-A. Both of them are compatible with LoRaWAN Class-A devices. Our data-driven experiments, based on the London bus network, show that our approaches can reduce data transmission delays up to 25% and provide a 53% throughput improvement in data transfer performance.

关键词： LoRa LoRaWAN LPWAN IoT scheduling mobile network data forwarding communications protocols

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Solving the Steiner Tree Problem with few Terminals 32

Solving the Steiner Tree Problem with few Terminals

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32nd ieee International conference on Tools with Artificial Intelligence (ICTAI)

作者： Fichte, Johannes K. Hecher, Markus Schidler, Andre Tech Univ Dresden Inst Artificial Intelligence Dresden Germany TU Wien Databases & Artificial Intelligence Grp Vienna Austria TU Wien Algorithms & Complex Grp Vienna Austria

ISBN: (纸本)9781728192284

The Steiner tree problem is a well-known problem in network design, routing, and VLSI design. Given a graph, edge costs, and a set of dedicated vertices (terminals), the Steiner tree problem asks to output a sub-graph that connects all terminals at minimum cost. A state-of-the-art algorithm to solve the Steiner tree problem by means of dynamic programming is the Dijkstra-Steiner algorithm. The algorithm builds a Steiner tree of the entire instance by systematically searching for smaller instances, based on subsets of the terminals, and combining Steiner trees for these smaller instances. The search heavily relies on a guiding heuristic function in order to prune the search space. However, to ensure correctness, this algorithm allows only for limited heuristic functions, namely, those that satisfy a so-called consistency condition. In this paper, we enhance the Dijkstra-Steiner algorithm and establish a revisited algorithm, called DS*. The DS* algorithm allows for arbitrary lower bounds as heuristics relaxing the previous condition on the heuristic function. Notably, we can now use linear programming based lower bounds. Further, we capture new requirements for a heuristic function in a condition, which we call admissibility. We show that admissibility is indeed weaker than consistency and establish correctness of the DS* algorithm when using an admissible heuristic function. We implement DS* and combine it with modern preprocessing, resulting in an open-source solver (DS* Solve). Finally, we compare its performance on standard benchmarks and observe a competitive behavior.

关键词： Steiner, Dual Ascent, dynamic programming, graph algorithm

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Real-time and Secure Geospatial Data Warehouse for Intelligent Transportation Systems 11

Real-time and Secure Geospatial Data Warehouse for Intellige...

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11th International conference on Information and Communication Technology Convergence (ICTC) - Data, network, and AI in the age of Untact (ICTC)

作者： Chan, Sean Ryan S. Dilangalen, Datuluna Ali G. Tan, Wilson M. Univ Philippines Diliman Dept Comp Sci Quezon City Philippines

ISBN: (纸本)9781728167589

Location data is crucial in intelligent transportation systems (ITS) as evidenced in Transport for London, Belgium's STIB, and NEXTBUS in the United States. In order to provide real-time information on public buses, trams, and trains to citizens, databases and data warehouses were adapted to source and deliver traffic data in many end-to-end systems. In contrast, open systems were rarely studied and implemented for their security risks and proprietary dependencies. In this paper, we propose a real-time, secure data warehouse paired with specific application programming interfaces (APIs) to facilitate movement of data and demonstrate an open ecosystem for third-party developers to produce intelligent mobility solutions such as a public vehicle tracker and a time-of-arrival estimator. The resulting design and implementation show how simple APIs can be the foundation for an open ecosystem in ITS development.

关键词： intelligent transportation systems real-time database application programming interfaces data warehouse vehicle tracking geographic information systems

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Study on Location and Sizing programming of Regional Substation 16

Study on Location and Sizing Programming of Regional Substat...

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16th ieee International conference on Mobility, Sensing and networking (MSN)

作者： Tan, Xiaolin Hu, Shiyao He, Chunguang Sun, Pengfei Zhang, Jing Ma, Ying State Grid Hebei Elect Power Co Ltd Inst Econ & Technol Shijiazhuang Hebei Peoples R China State Grid Jinzhou Power Supply Co Jinzhou Peoples R China Xiamen Univ Technol Xiamen Key Lab Data Min & Recommendat Xiamen Peoples R China

ISBN: (纸本)9781728199160

This paper proposes a research method for the location and capacity planning of regional substations. This method mainly studies and analyzes the active distribution network space based on load forecasting to complete the location and capacity analysis of regional substations. Combining the GIS information system and the power sensor network, based on the spatial load prediction results, and combined with the regional distributed power planning results, the location and capacity planning of the regional substations are carried out, and finally based on the location selection and capacity results, the power supply range of the substation and Economic calculation indicators have formed a set of technologically advanced, comprehensive and practical planning schemes, which can not only meet the needs of the distribution network at all levels in Xiongan New District for substation location and capacity, but also can be extended to urban areas of six cities, such as A, It is used in Class B areas to provide data support and scientific basis for the location and capacity of substations in the power grid, realize accurate planning, and assist relevant technical personnel in making decisions.

关键词： GIS location and capacity planning power sensor sensor network

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NCSbench: Reproducible Benchmarking Platform for networked Control Systems 17

NCSbench: Reproducible Benchmarking Platform for Networked C...

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ieee 17th Annual Consumer Communications and networking conference (CCNC)

作者： Zoppi, Samuele Ayan, Onur Molinari, Fabio Music, Zenit Gallenmueller, Sebastian Carle, Georg Kellerer, Wolfgang TUM Dept Elect & Comp Engn Chair Commun Networks Munich Germany TU Berlin Dept Elect Engn & Comp Sci Control Syst Grp Berlin Germany TUM Dept Informat Chair Network Architectures & Serv Munich Germany

ISBN: (纸本)9781728138930

The evolution of the Internet of Things accelerated the development of Cyber-Physical Systems. Among them, networked Control Systems (NCS) gained notable attention thanks to their application to industrial operations. Experimental NCS require expertise from control, computation, and communication disciplines. This requirement, together with the fragmentation of implementation platforms and experimental investigations, represents a challenge for the reproducibility and comparison of research results. In this paper, we tackle this problem by proposing a novel NCS benchmarking methodology that aids the reproducibility of NCS experiments. Relying on a novel approach to model the architectural elements and the delays of NCS, the methodology defines the experiment parameters and the relevant Key Performance Indicators (KPIs) that need to be observed during its execution. Furthermore, we detail the implementation of the first reproducible benchmarking platform for NCS. The proposed platform is open-source and designed to be easily reproducible and extensible by anyone. Finally, we replicate and evaluate the platform following the proposed NCS benchmarking methodology. The experimental results evaluate and compare the KPIs during the execution of the platform in different benchmarking scenarios, proving the validity of the proposed benchmarking methodology.

关键词： CPS NCS open-source Benchmarking Reproducibility KPI Delay Jitter Packet loss QoC

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