Articoli di riviste: "Proximity-Based Control"

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Mauer, Georg F. "An end-effector based imaging proximity sensor". Journal of Robotic Systems 6, n. 3 (giugno 1989): 301–16. http://dx.doi.org/10.1002/rob.4620060307.

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Di Mauro, G., M. Schlotterer, S. Theil e M. Lavagna. "Nonlinear Control for Proximity Operations Based on Differential Algebra". Journal of Guidance, Control, and Dynamics 38, n. 11 (novembre 2015): 2173–87. http://dx.doi.org/10.2514/1.g000842.

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Matsunaga, Shigeki, e Masakatsu Shibasaki. "Multimetallic Bifunctional Asymmetric Catalysis Based on Proximity Effect Control". Bulletin of the Chemical Society of Japan 81, n. 1 (15 gennaio 2008): 60–75. http://dx.doi.org/10.1246/bcsj.81.60.

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Garrido-Martinez, Jessenia, e Patricio Medina-Chicaiza. "Electoral Advertising Based on Proximity Marketing". International Business Research 12, n. 9 (26 agosto 2019): 52. http://dx.doi.org/10.5539/ibr.v12n9p52.

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This study seeks to propose a strategy for electoral advertising based on proximity marketing. It arises as a response to the problem detected through direct observation and structured interviews with specialists (experts in electoral marketing, politicians, publicists and ICT leaders) which evidenced the lack of technological tools for electoral advertising such as proximity marketing. In addition, theoretical methods and documentary analysis were used. The results include a proposed strategy with the following phases: search for a supplier, planning, multimedia documents, technological conditions, implementation, control.

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Long, Jiateng, e Fen Wu. "Iterative-Learning-Control-Based Tracking for Asteroid Close-Proximity Operations". Journal of Guidance, Control, and Dynamics 42, n. 5 (maggio 2019): 1195–203. http://dx.doi.org/10.2514/1.g003884.

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Tamayo Segarra, Jose Ignacio, Bilal Al Jammal e Hakima Chaouchi. "New IoT proximity service based heterogeneous RFID readers collision control". PSU Research Review 1, n. 2 (14 agosto 2017): 127–49. http://dx.doi.org/10.1108/prr-03-2017-0019.

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Purpose Internet of Things’ (IoT’s) first wave started with tracking services for better inventory management mainly using radio frequency identification (RFID) technology. Later on, monitoring services became one of the major interests, including sensing technologies, and then more actuation for remote control-type of IoT applications such as smart homes, smart cities and Industry 4.0. In this paper, the authors focus on the RFID technology impairment. They propose to take advantage of the mature IoT technologies that offer native service discovery such as blutooth or LTE D2D ProSe or Wifi Direct. Using the automatic service discovery in the new framework will make heterogeneous readers aware of the presence of other readers and this will be used by the proposed distributed algorithm to better control the multiple RFID reader interference problem. The author clearly considers emerging Industry 4.0 use case, where RFID technology is of major interest for both identification and tracking. To enhance the RFID tag reading performance, collisions in the RFID frequency should be minimized with reader-to-reader coordination protocols. In this paper, the author proposes a simple distributed reader anti-collision protocol named DiSim that makes use of proximity services of IoT network and is compliant with the current RFID standards. The author evaluates the efficiency of the proposal via simulation. Design/methodology/approach In this paper, the author proposes a simple distributed reader anti-collision protocol named DiSim that makes use of proximity services of IoT network and is compliant with the current RFID standards. The author evaluates the efficiency of the proposal via simulation to study its behavior in very dense and heterogeneous RFID environments. Specifically, the author explores the coexistence of powerful static readers and small mobile readers, comparing the proposal with a standard ETSI CSMA method. The proposal reduces significantly the number of access attempts, which are resource-expensive for the readers. The results show that the objectives of DiSim are met, producing low reader collision probability and, however, having lower average readings per reader per time. Findings DiSim is evaluated with the ETSI standard LBT protocol for multi-reader environments in several environments with varied levels of reader and tag densities, having both static powerful RFID readers and heterogeneous randomly moving mobile RFID readers. It effectively reduces the number of backoffs or contentions for the RFID channel. This has high reading success rate due to the avoided collisions; however, the readers are put to wait, and DiSim has less average readings per reader per time. As an additional side evaluation, the ETSI standard LBT mechanism was found to present a good performance for low-density mid-coverage scenarios, however, with high variability on the evaluation results. Research limitations/implications To show more results, the author needs to do real experimentation in a warehouse, such as Amazon warehouse, where he expects to have more and more robots, start shelves, automatic item finding on the shelve, etc. Practical implications Future work considers experimentation in a real warehouse equipped with heterogeneous RFID readers and real-time analysis of RFID reading efficiency also combined with indoor localization and navigation for warehouse mobile robots. Social implications More automatization is expected in the future; this work makes the use of RFID technology more efficient and opens more possibilities for services deployment in different domains such as the industry which was considered not only in this paper but also in smart cites and smart homes. Originality/value Compared to the literature, the proposal offers the advantage to not be dependent on a centralized server controlling the RFID readers. It also offers the possibility for an existing RFID architecture to add new readers from a different manufacturer, as the readers using the approach will have the possibility to discover the capabilities of the new interaction other RFID readers. This solution takes advantage of the available proximity service that will be more and more offered by the IoT technologies.

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Sun, Liang, e Zewei Zheng. "Disturbance Observer-Based Robust Saturated Control for Spacecraft Proximity Maneuvers". IEEE Transactions on Control Systems Technology 26, n. 2 (marzo 2018): 684–92. http://dx.doi.org/10.1109/tcst.2017.2669145.

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Severson, Frederick E. "Proximity control of on-board processor-based model train sound and control system". Journal of the Acoustical Society of America 126, n. 2 (2009): 930. http://dx.doi.org/10.1121/1.3204334.

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Kurahashi, A., M. Adachi e M. Idesawa. "A prototype of optical proximity sensor based on RORS". Journal of Robotic Systems 3, n. 2 (marzo 1986): 183–90. http://dx.doi.org/10.1002/rob.4620030206.

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Agudo, Isaac, Ruben Rios e Javier Lopez. "A privacy-aware continuous authentication scheme for proximity-based access control". Computers & Security 39 (novembre 2013): 117–26. http://dx.doi.org/10.1016/j.cose.2013.05.004.

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Li, Qi, Jianping Yuan, Bo Zhang e Huan Wang. "Disturbance observer based control for spacecraft proximity operations with path constraint". Aerospace Science and Technology 79 (agosto 2018): 154–63. http://dx.doi.org/10.1016/j.ast.2018.05.042.

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Stanfield, Kyl, e Ahmad Bani Younes. "Dual-Quaternion Analytic LQR Control Design for Spacecraft Proximity Operations". Sensors 21, n. 11 (21 maggio 2021): 3597. http://dx.doi.org/10.3390/s21113597.

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Abstract (sommario):

Proximity operations offer aggregate capability for a spacecraft operating in close proximity to another spacecraft, to perform on-orbit satellite servicing, or to a space object to perform debris removal. To utilize a spacecraft performing such advanced maneuvering operations and perceiving of the relative motion of a foreign spacecraft, these trajectories must be modeled accurately based on the coupled translational and rotational dynamics models. This paper presents work towards exploiting the dual-quaternion representations of spacecraft relative dynamics for proximity operations and developing a sub-optimal control law for efficient and robust maneuvers. A linearized model using dual-quaternions for the proximity operation was obtained, and its stability was verified using Monte Carlo simulations for the linear quadratic regulator solution. A sub-optimal control law using generalized higher order feedback gains in dual-quaternion form was developed based on small error approximations for the proximity operation and also verified through Monte Carlo simulations. Necessary information needed to understand the theory behind the use of the dual-quaternion is also overviewed within this paper, including the validity of using the dual-quaternions against their Cartesian or quaternion equivalents.

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Sun, Chen, Jean M. Uwabeza Vianney, Ying Li, Long Chen, Li Li, Fei-Yue Wang, Amir Khajepour e Dongpu Cao. "Proximity based automatic data annotation for autonomous driving". IEEE/CAA Journal of Automatica Sinica 7, n. 2 (marzo 2020): 395–404. http://dx.doi.org/10.1109/jas.2020.1003033.

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Salahi, Maziar, Tamás Terlaky e Guoqing Zhang. "The Complexity of Self-Regular Proximity Based Infeasible IPMs". Computational Optimization and Applications 33, n. 2-3 (18 ottobre 2005): 157–85. http://dx.doi.org/10.1007/s10589-005-3064-1.

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Ulrich, Steve, Alvar Saenz-Otero e Itzhak Barkana. "Passivity-Based Adaptive Control of Robotic Spacecraft for Proximity Operations Under Uncertainties". Journal of Guidance, Control, and Dynamics 39, n. 6 (giugno 2016): 1444–53. http://dx.doi.org/10.2514/1.g001491.

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Yang, Juntang, e Enrico Stoll. "Adaptive Sliding Mode Control for Spacecraft Proximity Operations Based on Dual Quaternions". Journal of Guidance, Control, and Dynamics 42, n. 11 (novembre 2019): 2356–68. http://dx.doi.org/10.2514/1.g004435.

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Sun, Liang. "Passivity-Based Adaptive Finite-Time Trajectory Tracking Control for Spacecraft Proximity Operations". Journal of Spacecraft and Rockets 53, n. 1 (gennaio 2016): 46–56. http://dx.doi.org/10.2514/1.a33288.

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Pan, Xiao, Alessandro A. Quarta, Giovanni Mengali e Ming Xu. "Linearized relative motion and proximity control of E-sail-based displaced orbits". Aerospace Science and Technology 99 (aprile 2020): 105574. http://dx.doi.org/10.1016/j.ast.2019.105574.

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Fatimah, Qori Izmi, Rivaldo Marselino e Asnil Asnil. "Web-Based DC Motor Speed Design and Control". MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering 3, n. 3 (2 settembre 2021): 101–12. http://dx.doi.org/10.46574/motivection.v3i3.99.

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This research discusses about web based speed control of DC motor. This research is a development research. The development that is design and assemble a speed control of DC motor so that becomes function work well. The result of research is speed control of DC motor and monitoring value of voltage, current and rotation speed from DC motor. Speed control of DC motor using PWM on the NodeMCU while monitoring of voltage, current and rotation speed from DC motor using voltage sensor, current sensor, and inductive proximity sensor. The results show that the system is great working. On the readings of the voltage value using voltage sensor and multimeter digital, there is a difference value between 0,01 to 0,13 Volt. While for the readings of the current value using current sensor ACS712 and multimeter digital, there is a difference average 0,01 Ampere. Proximity sensors are used by monitoring of the rotation speed of DC motor. The result is this sensor is working and function well. Penelitian ini membahas tentang pengendalian kecepatan motor DC menggunakan web. Penelitian ini merupakan penelitian pengembangan. Pengembangan yang dilakukan ialah merancang dan merakit sebuah web dan alat pengendali kecepatan motor DC sehingga menjadi satu kesatuan dan dapat berfungsi dengan baik. Hasil dari penelitian ini adalah mengatur kecepatan motor DC serta monitoring nilai tegangan, nilai arus dan nilai kecepatan putaran pada motor DC. Pengendalian kecepatan motor DC dilakukan dengan mengatur PWM pada NodeMCU sedangkan monitoring tegangan, arus dan kecepatan putaran motor DC menggunakan sensor tegangan, sensor arus ACS712 dan sensor proximity induktif. Hasil penelitian menunjukkan bahwa sistem bekerja dengan baik. Pada pembacaan tegangan menggunakan sensor tegangan dan multimeter digital terdapat selisih antara 0,01 sampai 0,13 Volt. Sedangkan untuk pembacaan nilai arus menggunakan sensor arus ACS712 dengan multimeter digital, terdapat selesih rata-rata 0,01 Ampere. Sensor proximity digunakan sebagai monitoring kecepatan putaran pada motor DC. Hasil menunjukkan bahwa sensor ini bekerja dengan baik sesuai dengan fungsinya.

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Budán, Maximiliano C. D., Maria Laura Cobo, Diego C. Martinez e Guillermo R. Simari. "Proximity semantics for topic-based abstract argumentation". Information Sciences 508 (gennaio 2020): 135–53. http://dx.doi.org/10.1016/j.ins.2019.08.037.

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Koyama, Keisuke, Makoto Shimojo, Aiguo Ming e Masatoshi Ishikawa. "Integrated control of a multiple-degree-of-freedom hand and arm using a reactive architecture based on high-speed proximity sensing". International Journal of Robotics Research 38, n. 14 (25 settembre 2019): 1717–50. http://dx.doi.org/10.1177/0278364919875811.

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We describe integrated control of a multiple-degree-of-freedom hand and arm using a simple reactive architecture based on high-speed proximity sensing. A proximity sensor installed on each fingertip of the hand detects the positions between the sensor and the surface of an object. By feeding back the sensor outputs, the reactive architecture simultaneously controls the position of the arm tip and the vector connecting the grasping position and the origin of the arm tip coordinates, the wrist posture, and the initial finger configurations before grasping. This architecture makes it possible to correct position errors. In addition, since the positions and postures are controlled without contact, there is no danger of damaging the object or the robot. To realize this integrated control using a simple reactive architecture, we designed a high-speed proximity sensor for the fingertips of the hand, and developed an integrated control system for the hand and the arm. We demonstrate high-speed position adjustment motion and grasping for static and moving objects in experiments.

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Sato, Ryuki, Hikaru Arita e Aiguo Ming. "Pre-Landing Control for a Legged Robot Based on Tiptoe Proximity Sensor Feedback". IEEE Access 10 (2022): 21619–30. http://dx.doi.org/10.1109/access.2022.3153127.

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Muddu, Swamy. "Auxiliary pattern-based optical proximity correction for better printability, timing, and leakage control". Journal of Micro/Nanolithography, MEMS, and MOEMS 7, n. 1 (1 gennaio 2008): 013002. http://dx.doi.org/10.1117/1.2898504.

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Nam, Byung-Ho, e Hyung-J. Lee. "Gate CD Control for memory Chip using Total Process Proximity Based Correction Method". Journal of the Optical Society of Korea 6, n. 4 (1 dicembre 2002): 180–84. http://dx.doi.org/10.3807/josk.2002.6.4.180.

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Kleinsasser, A. W. "Transistors based on proximity effect control of the critical current of a superconductor". IEEE Transactions on Applied Superconductivity 3, n. 1 (marzo 1993): 1968–71. http://dx.doi.org/10.1109/77.233573.

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Xia, Kewei, e Yao Zou. "Neuroadaptive saturated control for relative motion based noncooperative spacecraft proximity with prescribed performance". Acta Astronautica 180 (marzo 2021): 361–69. http://dx.doi.org/10.1016/j.actaastro.2020.12.052.

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Wu, Shunan, Shenghui Wen, Yuliang Liu e Kaiming Zhang. "Robust Adaptive Learning Control for Spacecraft Autonomous Proximity Maneuver". International Journal of Pattern Recognition and Artificial Intelligence 31, n. 05 (27 febbraio 2017): 1759007. http://dx.doi.org/10.1142/s0218001417590078.

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The robust adaptive learning control for spacecraft autonomous proximity is investigated in this paper. The relative motion dynamics is firstly proposed and transformed into the state space representation. An adaptive learning controller that allows performing autonomous proximity maneuvers in the presence of uncertain orbital parameters is then developed. The unknown disturbances are considered, and a modified adaptive learning controller is therefore designed in the presence of uncertain parameters and unknown disturbances. The asymptotic stability of the proposed controllers for the closed-loop systems is proven based on the Lyapunov theory. Different numerical results are finally provided and compared to illustrate the performance of the proposed adaptive learning controllers.

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Salahi, Maziar, e Tamás Terlaky. "An adaptive self-regular proximity-based large-update IPM for LO". Optimization Methods and Software 20, n. 1 (febbraio 2005): 169–85. http://dx.doi.org/10.1080/10556780412331332024.

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Hasegawa, Hiroaki, Yosuke Suzuki, Aiguo Ming, Masatoshi Ishikawa e Makoto Shimojo. "Robot Hand Whose Fingertip Covered with Net-Shape Proximity Sensor - Moving Object Tracking Using Proximity Sensing -". Journal of Robotics and Mechatronics 23, n. 3 (20 giugno 2011): 328–37. http://dx.doi.org/10.20965/jrm.2011.p0328.

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Occlusion in several millimeters from an object to be grasped made it difficult for a vision-sensor-based approach to detect relative positioning between this object and robot fingers joint grasping. The proximity sensor we proposed detects the object at a near range very effectively. We developed a thin proximity sensor sheet to cover the 3 fingers of a robot hand. Integrating sensors and hand control, we implemented an objecttracking controller. Using proximity sensory signals, the controller coordinates wrist positioning based on palm proximity sensors and grasping from fingertip sensors, enabling us to track and capture moving objects.

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Wulandari, Rindi, M. Riyad Ariwibowo, Taryo Taryo e Galieh Ananda. "Design Smart Trash Based On the Inductive Proximity Sensor". International Journal of Multidisciplinary Approach Research and Science 2, n. 01 (27 novembre 2023): 194–200. http://dx.doi.org/10.59653/ijmars.v2i01.394.

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Smart waste management, including a waste sorting system based on type, strongly supports the "Intelligent waste management and categorization system" program to support the development of modern cities. Therefore, this research is related to the design of smart waste based on an inductive distance sensor that uses Arduino Uno as a microcontroller. The method used in this research is research and development which consists of mechanical design and control system programming. The results obtained from this research are an intelligent waste design based on an inductive distance sensor that uses Arduino Uno as a microcontroller and uses a conveyor system as a waste transporter. The test results on the ultrasonic sensor were that several objects could be detected at a distance of 15 cm and the conveyor stopped for 0.5 seconds. The test results on the proximity sensor are that the object is read by the proximity sensor when the object is 2 cm from the sensor, and if the object is metal waste then the servo motor moves 30 degrees to the right, if it is non-metallic waste then the servo motor moves 30 degrees to the left

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Sun, Chuqi, Yan Xiao, Zhaowei Sun e Dong Ye. "Dual Quaternion Based Close Proximity Operation for In-Orbit Assembly via Model Predictive Control". International Journal of Aerospace Engineering 2021 (12 novembre 2021): 1–14. http://dx.doi.org/10.1155/2021/1305095.

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This paper studies the problem of guidance and control for autonomous in-orbit assembly. A six-degree-of-freedom (6-DOF) motion control for in-orbit assembly close proximity operation between a service satellite and a target satellite is addressed in detail. The dynamics based on dual quaternion are introduced to dispose the coupling effect between translation and rotation in a succinct frame, in which relevant perturbation and disturbance are involved. With the consideration of economical principle for fuel consume, a generic control system based on model predictive control (MPC) is then designed to generate a suboptimal control sequence for rendezvous trajectory considering actuator output saturation. The stability and robustness issues of the MPC-based control system are analyzed and proved. Numerical simulations are presented to demonstrate the effectiveness and robustness of the proposed control scheme, while additional comparisons for diverse horizons of the MPC are further conducted.

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Das, Bishnu Ram, Gitali Kakoti, Mandira Chetri e Pranabjit Biswanath. "Eco-epidemiological risk factors for Japanese encephalitis in the endemic region of North East India: a hospital-based case-control study". encephalitis 2, n. 4 (10 ottobre 2022): 108–15. http://dx.doi.org/10.47936/encephalitis.2022.00066.

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PurposeJapanese encephalitis (JE) has emerged as a major public health concern in North East India due to its complex eco-epidemiological risk factors. The objective of this study was to understand the various risk factors associated with JE infection in the endemic study location.Methods A hospital-based case-control study was conducted at Jorhat Medical College and Hospital from August 2017 to September 2018. The study participants included 49 confirmed JE cases with two control arms, one consisting of non-JE acute encephalitis syndrome (AES) patients (n = 91) and the other of non-JE non-AES patients (n = 140), admitted at the same time in the pediatric and medicine wards. A predesigned, pretested, structured questionnaire was used for data collection. ResultsUnivariate analysis revealed the following to be risk factors: age at onset, sex, religion, immunization status, proximity to pigs, proximity to paddy fields (<100 m), use of a mosquito net, impregnated mosquito net, mosquito repellent, and outdoor activities. Multiple logistic regression analysis identified age at onset (adjusted odds ratio [AOR], 20.900; 95% confidence interval [CI], 2.210–31.815) and proximity to pigs (AOR, 4.190; 95% CI, 1.592–11.040) as risk factors for the first control arm and proximity to paddy fields (<100 m) (AOR, 8.470; 95% CI, 2.0251–35.438) was the only risk factor found for second control arm, whereas impregnated mosquito nets (AOR, 0.082; 95% CI, 0.009–0.725) and mosquito repellent (AOR, 0.173; 95% CI, 0.052–0.575) were found to be associated with the second control arm.ConclusionAge at onset, proximity to pigs, proximity to paddy fields (<100 m), impregnated mosquito nets, and mosquito repellent were the most significant risk factors for JE in the NE region to warrant public health actions.

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Levin, Ines. "Learning about Spatial and Temporal Proximity using Tree-Based Methods". Statistics, Politics and Policy 13, n. 1 (1 marzo 2022): 73–95. http://dx.doi.org/10.1515/spp-2021-0031.

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Abstract Learning about the relationship between distance to landmarks and events and phenomena of interest is a multi-faceted problem, as it may require taking into account multiple dimensions, including: spatial position of landmarks, timing of events taking place over time, and attributes of occurrences and locations. Here I show that tree-based methods are well suited for the study of these questions as they allow exploring the relationship between proximity metrics and outcomes of interest in a non-parametric and data-driven manner. I illustrate the usefulness of tree-based methods vis-à-vis conventional regression methods by examining the association between: (i) distance to border crossings along the US-Mexico border and support for immigration reform, and (ii) distance to mass shootings and support for gun control.

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Sajini, S., e B. Pushpa. "Sensor Enabled Proximity Detection with Hybridisation of IoT and Computer Vision Models to Assist the Visually Impaired". Engineering, Technology & Applied Science Research 13, n. 6 (5 dicembre 2023): 12284–88. http://dx.doi.org/10.48084/etasr.6410.

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Proximity Detection Systems (PDS) are used to detect objects or persons close to Visually Impaired (VI) persons. Sensors are used to identify proximity based on the distance from objects. This study aimed to design a hybrid proximity detection framework for VI people using ultrasonic sensors embedded in a Raspberry Pi board to detect the proximity of a VI user in an office environment. Hybridization was based on the integration of IoT-enabled devices, ultrasonic proximity sensors, and computer vision algorithms to control the detection of objects or people and inform the user with a voice message. The model framework was implemented with 100 samples and tested with 10 analyses in each sample. The results showed significant improvement in detecting the proximity of the objects with an accuracy of 98.7%, outperforming current PDS with good results in precision, range, obstacle recognition, false positives and negatives, response time, usability, durability, reliability, etc.

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Won, Jae-Yeon, Hyunsurk Ryu, Tobi Delbruck, Jun Haeng Lee e Jiang Hu. "Proximity Sensing Based on a Dynamic Vision Sensor for Mobile Devices". IEEE Transactions on Industrial Electronics 62, n. 1 (gennaio 2015): 536–44. http://dx.doi.org/10.1109/tie.2014.2334667.

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Lohan, Elena Simona, Viktoriia Shubina e Dragoș Niculescu. "Perturbed-Location Mechanism for Increased User-Location Privacy in Proximity Detection and Digital Contact-Tracing Applications". Sensors 22, n. 2 (17 gennaio 2022): 687. http://dx.doi.org/10.3390/s22020687.

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Future social networks will rely heavily on sensing data collected from users’ mobile and wearable devices. A crucial component of such sensing will be the full or partial access to user’s location data, in order to enable various location-based and proximity-detection-based services. A timely example of such applications is the digital contact tracing in the context of infectious-disease control and management. Other proximity-detection-based applications include social networking, finding nearby friends, optimized shopping, or finding fast a point-of-interest in a commuting hall. Location information can enable a myriad of new services, among which we have proximity-detection services. Addressing efficiently the location privacy threats remains a major challenge in proximity-detection architectures. In this paper, we propose a location-perturbation mechanism in multi-floor buildings which highly protects the user location, while preserving very good proximity-detection capabilities. The proposed mechanism relies on the assumption that the users have full control of their location information and are able to get some floor-map information when entering a building of interest from a remote service provider. In addition, we assume that the devices own the functionality to adjust to the desired level of accuracy at which the users disclose their location to the service provider. Detailed simulation-based results are provided, based on multi-floor building scenarios with hotspot regions, and the tradeoff between privacy and utility is thoroughly investigated.

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Hirai, Yuji, Takuya Mizukami, Yosuke Suzuki, Tokuo Tsuji e Tetsuyou Watanabe. "Hierarchical Proximity Sensor for High-Speed and Intelligent Control of Robotic Hand". Journal of Robotics and Mechatronics 31, n. 3 (20 giugno 2019): 453–63. http://dx.doi.org/10.20965/jrm.2019.p0453.

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This study proposes a hierarchical proximity information processing system and a novel proximity sensor for realizing high-speed and robust grasp control of a robotic hand. The sensor requires both fast response and advanced situation judgment abilities. Therefore, a function that digitally samples individual reaction amounts of all detection elements is added to the net-structure proximity sensor (NSPS), which extracts the sum and center position of the distribution of reaction amounts of detection elements by high-speed analog computation on the sensor circuit. To integrate these two functions, we construct a circuit design method that enables the coexistence of a multichannel A/D converter circuit on the analog computing circuit of the NSPS without disturbing the current flow for sensing; the proposed sensor is called the “hierarchical proximity sensor.” An analysis of its characteristics indicates that the sensor can be used for feedback control of the fingertip position/posture and to estimate the curvature of objects. Through an experiment conducted using a robotic hand equipped with the proposed sensor, we confirmed that the fingertip can approach an object in 0.18 s based on the high-speed analog computation information, while the information for improving the motion can be obtained by comparing the temporal change in the finger joints with the digital sampling information of the process.

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Alsaade, Fawaz W., Qijia Yao, Mohammed S. Al-zahrani, Ali S. Alzahrani e Hadi Jahanshahi. "Indirect-Neural-Approximation-Based Fault-Tolerant Integrated Attitude and Position Control of Spacecraft Proximity Operations". Sensors 22, n. 5 (23 febbraio 2022): 1726. http://dx.doi.org/10.3390/s22051726.

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In this paper, a neural adaptive fault-tolerant control scheme is proposed for the integrated attitude and position control of spacecraft proximity operations in the presence of unknown parameters, disturbances, and actuator faults. The proposed controller is made up of a relative attitude control law and a relative position control law. Both the relative attitude control law and relative position control law are designed by adopting the neural networks (NNs) to approximate the upper bound of the lumped unknowns. Benefiting from the indirect neural approximation, the proposed controller does not need any model information for feedback. In addition, only two adaptive parameters are required for the indirect neural approximation, and the online calculation burden of the proposed controller is therefore significantly reduced. Lyapunov analysis shows that the overall closed-loop system is ultimately uniformly bounded. The proposed controller can ensure the relative attitude, angular velocity, position, and velocity stabilize into the small neighborhoods around the origin. Lastly, the effectiveness and superior performance of the proposed control scheme are confirmed by a simulated example.

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Yan, Xin, e Jia Gen Du. "On the Topology Design of Integrated Wireless Networks". Applied Mechanics and Materials 55-57 (maggio 2011): 555–60. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.555.

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Topology clustering, constructing overlay graphs, adding relay nodes, or creating a “small-world” network by building some shortcuts etc, topology control schemes are able to achieve the scalability, resilience, and fault-tolerance for wireless communication networks. In this article, we take a different approach to reach such aim for heterogeneous integrated wireless networks by generating a topology such that the resulting network is “scale-free”. Thereby we propose a topology control algorithm based on the “scale-free” complex network concept and directed proximity graph theory for integrated wireless networks with non-uniform transmission ranges. In this algorithm, the topology is also generated by new nodes’ growth and preferential attachment procedure, but where each new node connects to the existing nodes in its directed attachable proximity in terms of certain probability at each time step. Each node’s directed attachable proximity graph is generated from its directed reachable proximity graph that is built by regulating its transmission power based on locally collected information. The simulation experiments are provided to validate our claims.

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Pascoe, R. D., O. B. Udoudo e H. J. Glass. "Efficiency of automated sorter performance based on particle proximity information". Minerals Engineering 23, n. 10 (settembre 2010): 806–12. http://dx.doi.org/10.1016/j.mineng.2010.05.021.

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Xi, Tao, Jian Cheng Li e Wei Quan Pan. "Nonlinear Adaptive Feedback Control for Spacecraft Proximity Formation Flying". Applied Mechanics and Materials 376 (agosto 2013): 446–50. http://dx.doi.org/10.4028/www.scientific.net/amm.376.446.

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Spacecraft proximity formation flying is essential for future autonomous space mission such as autonomous rendezvous and docking and assembly of space system on-orbit. In order to improve the autonomy of relative motion control between two spacecrafts and concerning the effect of perturbation by bounded uncertain disturbance, a novel nonlinear adaptive feedback controller is developed based on sliding mode control law to maintain the desired reference trajectory as precisely as possible. The simulation results demonstrate the control scheme can effectively carry out the relative motion maintenance and have better asymptotically stability.

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Machida, Kazuo, Yoshitsugu Toda, Toshiaki Iwata, Yasushi Fukuda e Hidetoshi Toriu. "Sensor-based proximity operation of an astronaut reference flying robot". Advanced Robotics 9, n. 6 (gennaio 1994): 653–73. http://dx.doi.org/10.1163/156855395x00346.

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Lin, Bin, Xiao-lang Yan, Zheng Shi e Yi-wei Yang. "A sparse matrix model-based optical proximity correction algorithm with model-based mapping between segments and control sites". Journal of Zhejiang University SCIENCE C 12, n. 5 (maggio 2011): 436–42. http://dx.doi.org/10.1631/jzus.c1000219.

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Kim, Donghyeon, e In-Ho Lee. "Deep Learning-Based Power Control Scheme for Perfect Fairness in Device-to-Device Communication Systems". Electronics 9, n. 10 (1 ottobre 2020): 1606. http://dx.doi.org/10.3390/electronics9101606.

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The proximity-based device-to-device (D2D) communication allows for internet of things, public safety, and data offloading services. Because of these advantages, D2D communication has been applied to wireless communication networks. In wireless networks using D2D communication, there are challenging problems of the data rate shortage and coverage limitation due to co-channel interference in the proximity communication. To resolve the problems, transmit power control schemes that are based on deep learning have been presented in network-assisted D2D communication systems. The power control schemes have focused on enhancing spectral efficiency and energy efficiency in the presence of interference. However, the data-rate fairness performance may be a key performance metric in D2D communications, because devices in proximity can expect fair quality of service in the system. Hence, in this paper, a transmit power control scheme using a deep-learning algorithm based on convolutional neural network (CNN) is proposed to consider the data-rate fairness performance in network-assisted D2D communication systems, where the wireless channels are modelled by path loss and Nakagami fading. In the proposed scheme, the batch normalization (BN) scheme is introduced in order to further enhance the spectral efficiency of the conventional deep-learning transmit power control scheme. In addition, a loss function for the deep-learning optimization is defined in order to consider both the data-rate fairness and spectral efficiency. Through simulation, we show that the proposed scheme can achieve extremely high fairness performance while improving the spectral efficiency of the conventional schemes. It is also shown that the improvement in the fairness and spectral efficiency is achieved for different Nakagami fading conditions and sizes of area containing the devices.

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Fujiwara, T., M. R. Medellin, A. Sambri, Y. Tsuda, J. Balko, V. Sumathi, J. Gregory, L. Jeys e A. Abudu. "Preoperative surgical risk stratification in osteosarcoma based on the proximity to the major vessels". Bone & Joint Journal 101-B, n. 8 (agosto 2019): 1024–31. http://dx.doi.org/10.1302/0301-620x.101b8.bjj-2018-0963.r1.

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Aims The aim of this study was to determine the risk of local recurrence and survival in patients with osteosarcoma based on the proximity of the tumour to the major vessels. Patients and Methods A total of 226 patients with high-grade non-metastatic osteosarcoma in the limbs were investigated. Median age at diagnosis was 15 years (4 to 67) with the ratio of male to female patients being 1.5:1. The most common site of the tumour was the femur (n = 103) followed by tibia (n = 66). The vascular proximity was categorized based on the preoperative MRI after neoadjuvant chemotherapy into four types: type 1 > 5 mm; type 2 ≤ 5 mm, > 0 mm; type 3 attached; type 4 surrounded. Results Limb salvage rate based on the proximity type was 92%, 88%, 51%, and 0% for types 1 to 4, respectively, and the overall survival at five years was 82%, 77%, 57%, and 67%, respectively (p < 0.001). Local recurrence rate in patients with limb-salvage surgery was 7%, 8%, and 22% for the types 1 to 3, respectively (p = 0.041), and local recurrence at the perivascular area was observed in 1% and 4% for type 2 and 3, respectively. The mean microscopic margin to the major vessels was 6.9 mm, 3.0 mm, and 1.4 mm for types 1 to 3, respectively. In type 3, local recurrence-free survival with limb salvage was significantly poorer compared with amputation (p = 0.025), while the latter offered no overall survival benefit. In this group of patients, factors such as good response to chemotherapy or limited vascular attachment to less than half circumference or longitudinal 10 mm reduced the risk of local recurrence. Conclusion The proximity of osteosarcoma to major blood vessels is a poor prognostic factor for local control and survival. Amputation offers better local control for tumours attached to the blood vessels but does not improve survival. Limb salvage surgery offers similar local control if the tumour attachment to blood vessels is limited. Cite this article: Bone Joint J 2019;101-B:1024–1031.

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SUZUKI, Yosuke. "Torque-based Control of Approaching Motion of a 2-DOF Finger with a Proximity Sensor". Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2020 (2020): 2A2—K17. http://dx.doi.org/10.1299/jsmermd.2020.2a2-k17.

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Li, Qi, Bo Zhang, Jianping Yuan e Huan Wang. "Potential function based robust safety control for spacecraft rendezvous and proximity operations under path constraint". Advances in Space Research 62, n. 9 (novembre 2018): 2586–98. http://dx.doi.org/10.1016/j.asr.2018.08.003.

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Wu, Sixi, Li Chen, Dexin Zhang, Junli Chen e Xiaowei Shao. "Disturbance observer based fixed time sliding mode control for spacecraft proximity operations with coupled dynamics". Advances in Space Research 66, n. 9 (novembre 2020): 2179–93. http://dx.doi.org/10.1016/j.asr.2020.07.034.

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Ye, Jiatong, Tiancong Zhao e Hangyu Zhang. "A Pressure and Proximity Sensor Based on Laser-Induced Graphene". Sensors 24, n. 12 (17 giugno 2024): 3907. http://dx.doi.org/10.3390/s24123907.

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Abstract (sommario):

Smart wearable devices are extensively utilized across diverse domains due to their inherent advantages of flexibility, portability, and real-time monitoring. Among these, flexible sensors demonstrate exceptional pliability and malleability, making them a prominent focus in wearable electronics research. However, the implementation of flexible wearable sensors often entails intricate and time-consuming processes, leading to high costs, which hinder the advancement of the entire field. Here, we report a pressure and proximity sensor based on oxidized laser-induced graphene (oxidized LIG) as a dielectric layer sandwiched by patterned LIG electrodes, which is characterized by high speed and cost-effectiveness. It is found that in the low-frequency range of fewer than 0.1 kHz, the relative dielectric constant of the oxidized LIG layer reaches an order of magnitude of 104. The pressure mode of this bimodal capacitive sensor is capable of detecting pressures within the range of 1.34 Pa to 800 Pa, with a response time of several hundred milliseconds. The proximity mode involves the application of stimulation using an acrylic probe, which demonstrates a detection range from 0.05 mm to 37.8 mm. Additionally, it has a rapid response time of approximately 100 ms, ensuring consistent signal variations throughout both the approach and withdrawal phases. The sensor fabrication method proposed in this project effectively minimizes expenses and accelerates the preparation cycle through precise control of laser processing parameters to shape the electrode-dielectric layer-electrode within a single substrate material. Based on their exceptional combined performance, our pressure and proximity sensors exhibit significant potential in practical applications such as motion monitoring and distance detection.

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Chen, Rong, Yuzhu Bai, Yong Zhao, Zhijun Chen e Tao Sheng. "Safe Proximity Operation to Rotating Non-Cooperative Spacecraft with Complex Shape Using Gaussian Mixture Model-Based Fixed-Time Control". Applied Sciences 10, n. 17 (29 agosto 2020): 5986. http://dx.doi.org/10.3390/app10175986.

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This paper studies the safety control problem for rotating spacecraft proximity maneuver in presence of complex shaped obstacles. First, considering the attitude change of the target spacecraft, a dynamic model of close-range relative motion in a body-fixed coordinate system is derived using a novel approach. Then, the Gaussian mixture model (GMM) is utilized to reconstruct the complex shape of the spacecraft, and a novel GMM-based artificial potential function (APF) is proposed to represent the collision avoidance requirement. By combining GMM-based APF with fixed-time stability methodology, a fixed-time control (FTC) is designed for close-range proximity operation to a rotating spacecraft having a complex shape. The presented GMM-FTC scheme can guarantee the convergence of relative state errors, and ensure that no collision occurs. Finally, simulation results are provided to illustrate the feasibility of the proposed control approach.

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