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Learning memory management with c-Sim: A c-based visual tool

cOMPUTER APPLIcATIONS IN ENGINEERING EDUcATION 2019年第5期27卷 1217-1235页

作者： Garcia Perez-Schofield, Baltasar Garcia Rivera, Matias Ortin, Francisco Lado, Maria J. Univ Vigo Higher Sch Comp Sci Engn Campus As Lagoas Orense Spain Univ Oviedo Comp Sci Dept Oviedo Spain

Nowadays, computer Science (cS) students must cope with continuous challenges related to programming skill acquisition. In some occasions, they have to deal with the internals of memory management (pointers, pointer arithmetic, and heap management) facing a vision of programming from the low abstraction level offered by c. Even using c++ and references, not all scenarios where objects or collections of objects need to be managed can be covered. Based on the difficulties identified when dealing with such low-level abstractions, the c-Sim application, aimed at learning these concepts in an easy way, has been developed. To support the tool, the c programming language was selected. It allows showing concepts, remaining as close as possible both to the hardware and the operating system. To validate c-Sim, pre and posttests were filled in by a group of 60 first-year cS students, who employed the tool to learn about memory management. Grades of students using c-Sim were also obtained and compared with those that did not use the tool the former academic year. As main outcomes, 82.26% of students indicated that they had improved programming and memory management knowledge, and 83.64% pointed out that the use of this type of tools improves the understanding and quality of the practice lessons. Furthermore, the marks of students have significantly increased. Finally, c-Sim was designed from the ground up as a learning aid and can be useful for lecturers, who can complement their lessons using interactive demonstrations. Students can also employ it to experiment and learn autonomously.

关键词： c programming language education memory management systems programming visual tool

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A friendly online c compiler to improve programming skills based on student self-assessment

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cOMPUTER APPLIcATIONS IN ENGINEERING EDUcATION 2015年第6期23卷 887-896页

作者： cedazo, Raquel Garcia cena, cecilia E. Mohammed Al-Hadithi, Basil Univ Politecn Madrid Higher Tech Sch Ind Design & Engn Dept Elect Elect & Automat Control Engn & Appl Ph Madrid 28012 Spain Univ Politecn Madrid Ctr Automat & Robot CSIC Intelligent Control Grp E-28006 Madrid Spain Univ Politecn Madrid Ctr Automat & Robot E-28006 Madrid Spain

This paper presents an online c compiler designed so that students can program their practical assignments in programming courses. What is really innovative is the self-assessment of the exercises based on black-box tests and train students' skill to test software. Moreover, this tool lets instructors, not only proposing and classifying practical exercises, but also evaluating automatically the efforts dedicated and the results obtained by the students. The system has been applied to the 1st-year students at the Industrial Engineering specialization at the Universidad Politecnica de Madrid. Results show that the students obtained better academic performance, reducing the failure rate in the practical exam considerably with respect to previous years, in addition that an anonymous survey proved that students are satisfied with the system because they get instant feedback about their programs. (c) 2015 Wiley Periodicals, Inc. comput Appl Eng Educ 23:887-896, 2015;View this article online at;DOI .

关键词： black-box testing c programming language E-learning Interactive learning environments online self-assessment

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Direct Simulation Monte carlo Analysis of Rarefied Flows on Parallel Processors

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JOURNAL OF THERMOPHYSIcS AND HEAT TRANSFER 1991年第3期5卷 292-300页

作者： Wilmoth, Richard G. NASA Langley Res Ctr Div Space Syst Aerothermodynam Branch Hampton VA 23665 USA

A method for executing a direct simulation Monte carlo (DSMc) analysis using parallel processing is described. The method is based on using domain decomposition to distribute the work load among multiple processors, and the DSMc analysis is performed completely in parallel. Message passing is used to transfer molecules between processors and to provide the synchronization necessary for the correct physical simulation. Benchmark problems are described for testing the method, and results are presented that demonstrate the performance on two commercially available multicomputers. The results show that reasonable parallel speedup and efficiency can be obtained if the problem is sized properly to the number of processors. It is projected that, with a massively parallel system, performance exceeding that of current supercomputers is possible.

关键词： Direct Simulation Monte carlo Transitional Flow Supercomputers c programming language Vortex Flow Wall Temperature Operating Systems Parallel computers Parallel Algorithm Blunt Bodies

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Real-time identification of flutter boundaries using the discrete wavelet transform

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JOURNAL OF GUIDANcE cONTROL AND DYNAMIcS 2002年第2期25卷 334-339页

作者： Johnson, JD Lu, J Dhawan, AP Lin, R Univ Toledo Toledo OH 43606 USA NASA Dryden Flight Res Ctr Edwards AFB CA 92523 USA

Real-time analysis of an airframe's flutter boundaries during flight testing can help ensure safety and reduce costs. One method of identification is to perform correlation filtering using a set of singlet functions. The method is able to identify accurately the frequency and damping coefficient of the system to excitation, but the computational time required can be too significant to implement in real-time. An alternative method is presented for correlation filtering that employs a multiple-level discrete wavelet transform. The wavelet transform decomposes the response signal into a set of subsignals that correspond to different frequency bands. The same operation is applied to each entry in a dictionary of singlet functions. The transform results in a considerable reduction in the data and, thus, to a reduction in the computational time needed to calculate the correlation. We demonstrate that our approach is able to identify accurately frequency and damping characteristics of the impulse response of both a synthetically generated test signal and actual flight-test data. As a result, real-time identification of flutter boundaries during flight testing may be possible with relatively low-cost computational resources.

关键词： Airframes Modal Analysis Biorthogonal Wavelets c programming language Viscous Damping Flight Testing computing Aeroelastic System Dynamic Response Image Processing

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Robust control of passive-jointed robot and experimental validation using sliding mode

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JOURNAL OF GUIDANcE cONTROL AND DYNAMIcS 1996年第5期19卷 1039-1046页

作者： Ro, PI Yih, cc North Carolina State University Raleigh North Carolina 27695-7910

A robust control strategy for a passive-jointed robot using sliding mode control is investigated. Instead of an actuator, the passive joint has a brake to reduce the weight and energy consumption of the robot. While the brake is released, the passive joint is indirectly controlled by the motion of the active joint using the dynamic coupling of the robot manipulators, However, there are uncertainties associated with parameters in the links as well as in the operation of the actuator and the brake, To ensure minimum variation from the desired mode of operation in the presence of these uncertainties, a sliding mode control algorithm is developed and the performance evaluated. From simulation results, the sliding mode scheme is superior to a simple computed torque method in terms of passive-joint tracking performance and robustness. A two-link manipulator was designed and built to evaluate the proposed control scheme experimentally. The robot consists of one active joint and one passive joint and operates in a horizontal plane. The planar manipulator was controlled from a 32-bit 80486 microcomputer via DT2811 input/output board. The experimental results indicate that the sliding mode controller, when compared to the computed torque controller, reduces the tracking error by 50% and improves the robustness to variations in payloads.

关键词： Sliding Mode control Robots Rigid Manipulators Actuators Energy consumption Variable Structure System Tachometer Space Operations c programming language Numerical Simulation

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Efficient calculation of a jitter/stability metric

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JOURNAL OF SPAcEcRAFT AND ROcKETS 1997年第4期34卷 549-557页

作者： Giesy, DP LOCKHEED MARTIN CORP HAMPTONVA 23681

A tool for computing a jitter/stability metric used in NASA requirements statements is developed. An efficient algorithm is given for computing this metric. Two ways of implementing it an a computer are discussed. One is optimized for computational speed;the other sacrifices some speed to conserve memory. Timing studies are given to show that the improvement of computation times using the present algorithm over previously existing techniques can run to several orders of magnitude and that previous techniques were so costly that the present algorithm represents enabling technology. Further comparisons show that the memory-conservative implementation runs at about half the speed of the fast implementation but can cut the major data storage requirement of the fast implementation by 95-99%, making the algorithm implementable on much smaller computers, such as personal computers, than it would be otherwise. Software for both implementations is included in version 2.0 of the NASA time- and frequency-domain analysis program PLATSIM.

关键词： c programming language computer Memory Data Storage Time Domain Analysis Scatter Plot computing Institute of Electrical and Electronics Engineers NASA Langley Research center Numerical Simulation Spacecraft Design

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Method of railway shunting operation sheet information extraction guided by table header

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IET INTELLIGENT TRANSPORT SYSTEMS 2022年第10期16卷 1391-1403页

作者： Zhang, Bingjie Huang, Shize Zhang, Lei Liu, Xiaowen Song, Guanqun Qin, Jinzhe Li, Man Tongji Univ Minist Educ Key Lab Rd & Traff Engn Shanghai Peoples R China Tongji Univ Shanghai Key Lab Rail Infrastruct Durabil & Syst Shanghai Peoples R China Tongji Univ Dept Traff Informat & Control Engn Shanghai Peoples R China Beijing Jiaotong Univ State Key Lab Rail Traff Control & Safety Beijing Peoples R China

The railway shunting operation sheet is the written plan of the shunting operation. In the current shunting operation preparation process, signalmen must input the plans manually for subsequent execution, which is inefficient and at risk of misoperation. Here, an information extraction method is proposed to convert shunting operation sheet images to readable instructions for continuous Train control (cTc) systems. First, the shunting operation sheet images are preprocessed to facilitate subsequent text recognition based on the Paddle OcR model. Second, the table is located and reconstructed with the results of recognized contents and coordinates of texts. Then, the results of the table reconstruction were optimized based on the tabulation rules of shunting operation. Finally, tabular texts containing structural and attribute information are transcribed into eXtensible Markup language (XML) format, which can be read automatically by cTc systems based on the c programming language. The proposed approach was evaluated on real-world samples, and the results showed that the comprehensive accuracy of information extraction was 0.85. Furthermore, a pre-processing combination strategy was established to improve the accuracy and generalizability of the proposed method.

关键词： text analysis optical character recognition extensible markup language Paddle OcR model XML format continuous train control systems shunting operation sheet images subsequent text recognition shunting operation preparation process information extraction method railway engineering railway shunting operation XML c programming language preprocessing combination strategy

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USING THE c-language TO APPROXIMATE NONLINEAR STOcHASTIc-SYSTEMS

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ADVANcES IN ENGINEERING SOFTWARE AND WORKSTATIONS 1990年第2期12卷 59-68页

作者： SERRANO, SE Department of Civil Engineering University of Kentucky Lexington Kentucky 40506-0046 USA

Recognizing the growing popularity and demand for scientific or numerical libraries in the c computer language, and the shortage of systematic methods for the increasingly important non-linear stochastic systems, this article attempts to present a method to approximate the solution of systems governed by non-linear stochastic differential equations and the corresponding algorithm and computer code in the c language. It was found that the c language offers promising possibilities for the stochastic systems modeler. It is hoped the use of c for the analysis of these type of problems will be encouraged.

关键词： stochastic differential equations non-linear systems Green's function approximation c programming language

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FAST FLOATING-POINT PROcESSING IN cOMMON LISP

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AcM TRANSAcTIONS ON MATHEMATIcAL SOFTWARE 1995年第1期21卷 26-62页

作者： FATEMAN, RJ BROUGHAN, KA WILLcOcK, DK RETTIG, D UNIV WAIKATO DEPT MATH & STAT HAMILTON NEW ZEALAND FRANZ INC BERKELEY CA 94704 USA

Lisp, one of the oldest higher-level programming languages, has rarely been used for fast numerical (floating-point) computation We explore the benefits of common Lisp, an emerging new language standard with some excellent implementations, for numerical computation. We compare it to Fortran in terms of the speed of efficiency of generated code, as well as the structure and convenience of the language. There are a surprising number of advantages to Lisp, especially in cases where a mixture of symbolic and numeric processing is needed.

关键词： c programming language cOMMON LISP cOMPILER OPTIMIZATION FLOATING-POINT ARITHMETIc FORTRAN LISP NUMERIcAL ALGORITHMS SYMBOLIc cOMPUTATION

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A c-language PROGRAM FOR THE cOMPUTATION OF POWER SPEcTRA ON A LABORATORY MIcROcOMPUTER

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cOMPUTER METHODS AND PROGRAMS IN BIOMEDIcINE 1986年第3期22卷 285-291页

作者： WEBBER, cL Department of Physiology Loyola University of Chicago Stritch School of Medicine 2160 South First Avenue Maywood IL 60153 U.S.A.

A computer program is described which performs power-spectral analyses on time-domain data. The program is written in the c language and incorporates an algorithm for the fast Fourier transform translated from BASIc into c. Sequential segments of time-domain data are accessed by the program, transformed to the frequency domain, and ensemble-averaged to generate smoothed spectra. Specific application of the program to the detection of high-frequency oscillations in the phrenic neurogram of the cat is addressed. Thus, 100 successive 512-point fast Fourier transforms were found to accurately reveal the relative strength (power) and frequency position (spectrum) of multiple peaks in this respiratory motor pathway. Because c language programs are very transportable, this program should run on machines other than our LSI 11/23, provided a c-compiler is available.

关键词： c programming language Fast Fourier transforms Power spectra Signal analysis

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