Journal articles: 'Communications concurrentes'

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Martinasson, Maxime, and Jean-François Méhaut. "Modèle de communications concurrentes sur des grappes SMP." Techniques et sciences informatiques 27, no. 3-4 (April 30, 2008): 317–44. http://dx.doi.org/10.3166/tsi.27.317-344.

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Hussain, Sajjad, Aftab Hussain, Muhmmad Waleed Aftab, Hamza Kundi, Irfan Ullah, Abid Ali, Shahid Rasool, Umar Ali Khan, and Hassan M. Al-Jawahry. "Massive Connectivity and Low-Latency for Next-Generation Internet of Things: A Filtered OFDM-based Deep Learning Approach." Journal of Smart Internet of Things 2023, no. 2 (December 1, 2023): 115–21. http://dx.doi.org/10.2478/jsiot-2023-0014.

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Abstract The Internet of Things (IoT) is one of the numerous services offered by sixth-generation (6G) mobile communications. It is necessary to meet heterogeneous criteria for large connectivity and low latency to serve the various kinds of IoT applications. In order to concurrently provide enormous connectivity and meet the low-latency conditions in the uplink IoT network, we proposed filtered orthogonal frequency division multiplexing (FOFDM) based on a service group adopting the deep learning (DL) technique. The proposed FOFDM-DL platform focuses on two key areas: first, it works for the concurrence of different time-frequency granularity appropriate for distinct service-based grouping, and secondly, it facilitates low latency and massive connectivity to deliver dependable communications. The suggested FOFDM-DL architecture may accommodate the needs of massive machine-type communication referred as mMTC and ultra-reliable and low-latency communications known as uRLLC concurrently for the next-generation communication systems. However, the uRLLC and mMTC requirements can only be supported separately by the new radio (NR)-5G, beyond 5G (or 6G). In comparison to the traditional scheme, simulation results demonstrate that the suggested FOFDM-DL platform works surprisingly well in the next-generation IoT network.

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Collette, Karine. "La concurrence discursive." Communication, Vol. 25/2 (June 15, 2007): 107–30. http://dx.doi.org/10.4000/communication.707.

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Warren, Nooshin L., and Alina Sorescu. "When 1 + 1 > 2: How Investors React to New Product Releases Announced Concurrently with Other Corporate News." Journal of Marketing 81, no. 2 (March 2017): 64–82. http://dx.doi.org/10.1509/jm.15.0275.

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Firms routinely use press releases to announce the launch of their new products. An examination of these press releases shows that in approximately 7% of cases, firms issue new product announcements concurrently with other corporate announcements. However, the consequences of these actions are unknown because event studies typically eliminate concurrent announcements in an attempt to avoid their confounding effects. The authors use a comprehensive sample of press releases issued by publicly traded U.S. firms to document the consequences of firms announcing the release of a new product concurrently with another corporate announcement that conveys good news. Drawing on Merton's (1987) model of capital market equilibrium with incomplete information, the authors identify three conditions that are conducive to the issuance of concurrent new product announcements. They then verify that under these conditions, the increase in shareholder value associated with concurrent announcements is higher than that associated with issuing two similar announcements separately. This research provides insights into how firms can leverage corporate communications to increase stock prices.

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Hussein, Ahmed F., and Hany Elgala. "Design and spectral analysis of mixed-carrier communication for sixth-generation networks." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2238 (June 2020): 20200165. http://dx.doi.org/10.1098/rspa.2020.0165.

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The fifth-generation (5G) wireless cellular network is expected to be ready for commercialization within this year. The huge spectrum enabled by the millimetre-wave (mm-Wave) technology is expected to introduce a hype in data usage per user. The 5G is also expected to concurrently support a wide variety of services; however, the practical trade-offs associated with concurrent services require further investigations. In this work, a physical layer (PHY) design to support visible light communications is considered to efficiently support concurrent services that are essential to serve the needs of the sixth-generation (6G) network. A novel communication technique, i.e. mixed-carrier communication (MCC), is proposed. MCC enables simultaneous wireless services such as broadband access, low-rate internet-of-things connectivity, device-free sensing, and device-based localization. This study presents, firstly, a thorough investigation of the design procedure of the novel MCC PHY, secondly, the spectral profile of MCC towards proper spectrum management and interference analysis, and thirdly, performance evaluation based on modelling, simulation and an experimental proof-of-concept. The design steps recommend that the system performance degrades beyond a signal-to-noise ratio (SNR) threshold. For instance, SNR of 25.1 dB and 2.6652 optical power ratio between the communications signal and the driving envelope, for 64-quadrature amplitude modulation (64-QAM), are recommended to avoid performance degradation due to clipping. Simulation results show an interference-immune performance of a properly managed spectrum. For a bit-error-rate (BER) of 10 −3 , an SNR penalty of 2–5 dB is observed for different interference scenarios. The experimental measurements illustrate a high-quality signal of 21 dB SNR at 50 cm and 10 −3 BER using 64-QAM.

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Ramya, T. Rama Rao, and Revathi Venkataraman. "Concurrent Multi-Band Low-Noise Amplifier." Journal of Circuits, Systems and Computers 26, no. 06 (March 5, 2017): 1750104. http://dx.doi.org/10.1142/s0218126617501043.

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With rapid expansions of wireless communications, requirements for transceivers that support concurrent multiple services are continuously increasing and demanding design of a concurrent low-noise amplifier (LNA) with low noise figure (NF), high gain, and high linearity over a wide frequency range for various wireless applications. The proposed work focuses on a concurrent multi-band LNA that works at navigational frequencies, namely, of 1.2[Formula: see text]GHz and 1.5[Formula: see text]GHz, wireless communication frequencies, namely, of 2.45[Formula: see text]GHz and 3.3[Formula: see text]GHz, dedicated short range communication (DSRC) frequency of 5.8[Formula: see text]GHz for the vehicular communication applications. This circuit has a distinct input matching network which resonates at all desired five frequency bands and is achieved by adapting frequency transformation method. To accomplish simultaneous reception of the desired penta-band, the output matching is designed with simple LC matching network with the aid of load-pull methodology.

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Urban, Susan D., Ziao Liu, and Le Gao. "Decentralized Communication for Data Dependency Analysis Among Process Execution Agents." International Journal of Web Services Research 8, no. 4 (October 2011): 1–28. http://dx.doi.org/10.4018/jwsr.2011100101.

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This paper presents the authors results with the investigation of decentralized data dependency analysis among concurrently executing processes in a service-oriented environment. Distributed Process Execution Agents (PEXAs) are responsible for controlling the execution of processes that are composed of web services. PEXAs are also associated with specific distributed sites for the purpose of capturing data changes that occur at those sites in the context of service executions using Delta-Enabled Grid Services. PEXAs then exchange this information with other PEXAs to dynamically discover data dependencies that can be used to enhance recovery activities for concurrent processes that execute with relaxed isolation properties. This paper outlines the functionality of PEXAs, describing the data structures, algorithms, and communication mechanisms that are used to support decentralized construction of distributed process dependency graphs, demonstrating a more dynamic and intelligent approach to identifying how the failure of one process can potentially affect other concurrently executing processes.

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Iqbal, Muhammad Shahid, Yalcin Sadi, and Sinem Coleri. "Minimum Length Scheduling for Multi-Cell Full Duplex Wireless Powered Communication Networks." Sensors 21, no. 19 (October 2, 2021): 6599. http://dx.doi.org/10.3390/s21196599.

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Wireless powered communication networks (WPCNs) will be a major enabler of massive machine type communications (MTCs), which is a major service domain for 5G and beyond systems. These MTC networks will be deployed by using low-power transceivers and a very limited set of transmission configurations. We investigate a novel minimum length scheduling problem for multi-cell full-duplex wireless powered communication networks to determine the optimal power control and scheduling for constant rate transmission model. The formulated optimization problem is combinatorial in nature and, thus, difficult to solve for the global optimum. As a solution strategy, first, we decompose the problem into the power control problem (PCP) and scheduling problem. For the PCP, we propose the optimal polynomial time algorithm based on the evaluation of Perron–Frobenius conditions. For the scheduling problem, we propose a heuristic algorithm that aims to maximize the number of concurrently transmitting users by maximizing the allowable interference on each user without violating the signal-to-noise-ratio (SNR) requirements. Through extensive simulations, we demonstrate a 50% reduction in the schedule length by using the proposed algorithm in comparison to unscheduled concurrent transmissions.

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Wu, Bin, Nobuo Funabiki, Sujan Chandra Roy, Md Mahbubur Rahman, Dezheng Kong, and Shihao Fang. "An Application of Throughput Request Satisfaction Method for Maximizing Concurrent Throughput in WLAN for IoT Application System." Sensors 24, no. 7 (March 28, 2024): 2173. http://dx.doi.org/10.3390/s24072173.

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With the wide applications of the Internet of Things (IoT) in smart home systems, IEEE 802.11n Wireless Local Area Networks (WLANs) have become a frequently chosen communication technology due to their adaptability and affordability. In a high-density network of devices such as the smart home scenerio, a host often meets interferences from other devices and unequal Received Signal Strength (RSS) from Access Points (APs). This results in throughput unfairness/insufficiency problems between hosts communicating concurrently in WLAN. Previously, we have studied the throughput request satisfaction method to address this problem. It calculates the target throughput from measured single and concurrent throughputs of hosts and controls the actual throughput at this target one by applying traffic shaping at the AP. However, the insufficiency problem of maximizing the throughput is not solved due to interferences from other hosts. In this paper, we present an extension of the throughput request satisfaction method to maximize the throughput of a high-priority host under concurrent communications. It recalculates the target throughput to increase the actual throughput as much as possible while the other hosts satisfy the least throughput. For evaluations, we conduct experiments using the test-bed system with Raspberry Pi as the AP devices in several topologies in indoor environments. The results confirm the effectiveness of our proposal.

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Hyppa Martin, Jolene, Joe Reichle, Adele Dimian, and Mo Chen. "Communication Modality Sampling for a Toddler With Angelman Syndrome." Language, Speech, and Hearing Services in Schools 44, no. 4 (October 2013): 327–36. http://dx.doi.org/10.1044/0161-1461(2013/12-0108).

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Purpose Vocal, gestural, and graphic communication modes were implemented concurrently with a toddler with Angelman syndrome to identify the most efficiently learned communication mode to emphasize in an initial augmentative communication system. Method Symbols representing preferred objects were introduced in vocal, gestural, and graphic communication modes using an alternating treatment single-subject experimental design. Conventionally accepted prompting strategies were used to teach symbols in each communication mode. Because the learner did not vocally imitate, vocal mode intervention focused on increasing vocal frequency as an initial step. Results When graphic and gestural mode performances were compared, the learner most accurately produced requests in graphic mode (percentage of nonoverlapping data = 96). Given the lack of success in prompting vocal productions, a comparison between vocal and the other two communication modes was not made. Conclusion A growing body of evidence suggests that concurrent modality sampling is a promising low-inference, data-driven procedure that can be used to inform selection of a communication mode(s) for initial emphasis with young children. Concurrent modality sampling can guide clinical decisions regarding the allocation of treatment resources to promote success in building an initial communicative repertoire.

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Mayer, Richard E. "Research-based principles for the design of instructional messages." Document Design 1, no. 1 (November 5, 1999): 7–19. http://dx.doi.org/10.1075/dd.1.1.02may.

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Multimedia explanations are communications using words and pictures to explain how something works, including animation and narration in computer-based environments or text and illustrations in book-based environments. A cognitive theory of multimedia learning reveals a concurrence requirement for meaningful learning, in which corresponding verbal and pictorial representations must be held in working memory at the same time. Based on a theory-based research program, I propose five design principles: multimedia principle, to use words and pictures rather than words alone; contiguity principle, to place words close to corresponding pictures on a page or to present narration concurrently with corresponding animation; coherence principle, to minimize extraneous words, pictures, and sounds; modality principle, to present words as speech rather than as on-screen text; and individual differences principle, to use these design principles particularly for low-experience rather than high-experience learners and for high-spatial rather than low-spatial learners. Multimedia messages offer great potential for improving the effectiveness of communication, but only to the extent that their design is based on theory and research.

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Hogg, John, and Rodney Iversen. "Representing concurrent communication systems." ACM SIGPLAN OOPS Messenger 2, no. 2 (April 1991): 37–39. http://dx.doi.org/10.1145/127070.127076.

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Olaogun, A. A. E., W. R. Brieger, P. O. Obianjuwa, A. B. Ayoola, and S. O. Adebayo. "Mother-Father Concordance on Treatment Choices in the Care of Sick Children under Five Years of Age in Osun State, Nigeria." International Quarterly of Community Health Education 25, no. 3 (October 2005): 283–93. http://dx.doi.org/10.2190/0373-6757-jq16-8513.

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Communication and agreement between spouses has been found to be an important factor in terms of acceptance and use of family planning services and supplies. Therefore, it is likely that agreement between spouses may play an important role in other aspects of family health, including care of childhood illness. This study, based in a rural and an urban community in Osun State, Nigeria, set out to determine the agreement between mothers and fathers on the illness experience and care provided to their preschool age children. Among the 550 couples studied, most mothers (98%) and fathers (94%) reported that they “did something” to help during their child's recent illness. The illness was recognized first by the mothers according to 83% of respondents. Overall, 81% of couples concurred that the mother was the first to discover the illness. Concurrence was greater in urban areas and where fathers read a newspaper frequently. Only 45% concurred on who took the decision for first action to address the illness, which again was greater in the urban area and in families where the father read a newspaper frequently. Parents also were not in full agreement about the name of the child's illness, but concurrence was greater in the case of malaria/fever. Finally, concurrence on the actual first form of treatment care reached only 36%. Most concurrent couples and non-concurrent mothers mentioned drug shops/chemists as the first source of care, while non-concurrent fathers placed government clinics first. While mothers are likely to be the main caregivers, fathers do have decision making and financial roles. Not only should health education for appropriate and prompt care of child illnesses be aimed equally are both parents, it should also recognize that fathers may have different perceptions from mothers. Education should also encourage better couple communication.

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Renaud, Lise, and Carmen Rico de Sotelo. "Communication et santé : des paradigmes concurrents." Santé Publique 19, no. 1 (2007): 31. http://dx.doi.org/10.3917/spub.071.0031.

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Zathureczky, Kornel, and Jacques-André Houle. "Modernités concurrentes." Thème 19, no. 2 (May 1, 2014): 65–87. http://dx.doi.org/10.7202/1024728ar.

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Cet article propose une évaluation critique des deux réponses d’envergure à « A Common Word » originaire de centres traditionnels de la chrétienté européenne. Dans les deux cas, la notion de bien commun joue un rôle central dans la détermination de la forme et de l’orientation de la coopération interreligieuse dans un contexte mondial. Alors que les réponses émanant du Vatican sont lues comme une expression de la pragmatique interreligieuse, la seconde, un engagement plus solide de Rowan Williams est présenté comme une tentative de développer une éthique interreligieuse de la communication. L’examen critique de ces deux visions de la solidarité interreligieuse conduit à des conclusions significatives quant à la notion d’autrui, une catégorie centrale partagée par toutes les traditions abrahamiques.

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Di Giusto, Cinzia, Davide Ferré, Laetitia Laversa, and Etienne Lozes. "A Partial Order View of Message-Passing Communication Models." Proceedings of the ACM on Programming Languages 7, POPL (January 9, 2023): 1601–27. http://dx.doi.org/10.1145/3571248.

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There is a wide variety of message-passing communication models, ranging from synchronous "rendez-vous" communications to fully asynchronous/out-of-order communications. For large-scale distributed systems, the communication model is determined by the transport layer of the network, and a few classes of orders of message delivery (FIFO, causally ordered) have been identified in the early days of distributed computing. For local-scale message-passing applications, e.g., running on a single machine, the communication model may be determined by the actual implementation of message buffers and by how FIFO queues are used. While large-scale communication models, such as causal ordering, are defined by logical axioms, local-scale models are often defined by an operational semantics. In this work, we connect these two approaches, and we present a unified hierarchy of communication models encompassing both large-scale and local-scale models, based on their concurrent behaviors. We also show that all the communication models we consider can be axiomatized in the monadic second order logic, and may therefore benefit from several bounded verification techniques based on bounded special treewidth.

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LALIRE, MARIE. "Relations among quantum processes: bisimilarity and congruence." Mathematical Structures in Computer Science 16, no. 3 (June 2006): 407–28. http://dx.doi.org/10.1017/s096012950600524x.

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Full formal descriptions of algorithms making use of quantum principles must take into account both quantum and classical computing components, as well as communications between these components. Moreover, to model concurrent and distributed quantum computations and quantum communication protocols, communications over quantum channels that move qubits physically from one place to another must also be taken into account.Inspired by classical process algebras, which provide a framework for modelling cooperating computations, a process algebraic notation is defined. This notation provides a homogeneous style for formal descriptions of concurrent and distributed computations comprising both quantum and classical parts. Based upon an operational semantics that makes sure that quantum objects, operations and communications operate according to the postulates of quantum mechanics, an equivalence is defined among process states considered as having the same behaviour. This equivalence is a probabilistic branching bisimulation. From this relation, an equivalence on processes is defined. However, it is not a congruence because it is not preserved by parallel composition.

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Kuokka, Daniel R., and Larry T. Harada. "Communication infrastructure for concurrent engineering." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 9, no. 4 (September 1995): 283–97. http://dx.doi.org/10.1017/s0890060400002833.

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AbstractIntegrating multiple engineering perspectives is critical to designing ever more complex products, but this introduces great potential for miscommunication leading to design conflicts. The SHADE (SHAred Dependency Engineering) project is defining agent infrastructure technology that supports dynamic, knowledge-based communication among heterogeneous engineering tools, collaboration systems, and conflict management systems. Building on technologies for defining a shared formal vocabulary and protocols for exchanging information, SHADE is developing facilitators that assist in locating and disseminating information. The result is a flexible infrastructure that helps existing engineering tools work together more effectively, and that supports a variety of new conflict management approaches. This article outlines the facilitation and application agents created by SHADE, and provides an in-depth example of their application to an engineering task.

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Peleg, David. "Communication in concurrent dynamic logic." Journal of Computer and System Sciences 35, no. 1 (August 1987): 23–58. http://dx.doi.org/10.1016/0022-0000(87)90035-3.

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Kalkhoff, Will, Stanford W. Gregory, and David Melamed. "Effects of Dichotically Enhanced Electronic Communication on Crash Risk and Performance during Simulated Driving." Perceptual and Motor Skills 108, no. 2 (April 2009): 449–64. http://dx.doi.org/10.2466/pms.108.2.449-464.

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In a driving simulator experiment, male and female college students received turn-by-turn driving directions and cognitive tasks while interacting with an experimenter via an audio communication system. In an Enhanced condition ( n = 29), lower speech frequencies (containing the speech fundamental frequency) were routed to participants' left ears (with right cerebral-hemisphere processing) and verbal frequencies above the speech fundamental frequency were routed to right ears (with left hemisphere processing). A control group ( n = 31) heard unfiltered communications in both ears. Compared to those in the Control condition, participants in the Enhanced condition were significantly less likely to crash and had nonsignificantly lower rates of driving errors (speed infractions, improper lane position, and following distance errors). The results suggest a means of alleviating cognitive load pressure and mitigating crash risk when complex equipment is operated concurrently with two-way electronic communications (cell phone communication while driving, air-to-air and air-to-ground communications, etc.).

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Parimi, Sruthi Sanhitha. "Gesture Vocalizer and its Visualization." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 3265–68. http://dx.doi.org/10.22214/ijraset.2021.35837.

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People have the voice ability for communicating among one another. Tragically, not every person has the ability to talk and hear. Gesture based communication utilized among the local area of individuals who are distinctive abled as the methods for correspondence. Communication through signing is a motion portrayal that includes concurrent joining hand shapes and development of the hands, arms or body, and looks to communicate. The people who can't talk utilizes the gesture based communications to speak with other individual vocally hindered individual and even with other ordinary individuals who knows the implications of gesture based communications or an interpreter is expected to decipher the implications of gesture based communications to others who can talk and do comprehend the gesture based communications. In any case, it's anything but consistently workable for a person to associate with constantly to decipher the communications via gestures and not every person can gain proficiency with the communications through signing. In this way, another option is that we can utilize a gadget Gesture Vocalizer as an arbiter. The Gesture Vocalizer can take the motions a contribution from the vocally impeded individual and interaction it's anything but a literary and sound type of yield.

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Begum, Seema, Yao Nianmin, Syed Bilal Hussain Shah, Asrin Abdollahi, Inam Ullah Khan, and Liqaa Nawaf. "Source Routing for Distributed Big Data-Based Cognitive Internet of Things (CIoT)." Wireless Communications and Mobile Computing 2021 (July 29, 2021): 1–10. http://dx.doi.org/10.1155/2021/5129396.

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Dynamic opportunistic channel access with software-defined radio at a network layer in distributed cognitive IoT introduces a concurrent channel selection along with end-to-end route selection for application data transmission. State-of-the-art cognitive IoT big data-based routing protocols are not explored in terms of how the spectrum management is being coordinated with the network layer for concurrent channel route selection during end-to-end channel route discovery for data transmission of IoT and big data applications. In this paper, a reactive big data-based “cognitive dynamic source routing protocol” is proposed for cognitive-based IoT networks to concurrently select the channel route at the network layer from source to destination. Experimental results show that the proposed protocol cognitive DSR with concurrent channel route selection criteria is outperformed. This will happen when it is compared with the existing distributed cognitive DSR with independent channel route application data transmission.

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M. Faisal, Ghadah, Hasanain Abdalridha Abed Alshadoodee, Haider Hadi Abbas, Hassan Muwafaq Gheni, and Israa Al-Barazanchi. "Integrating security and privacy in mmWave communications." Bulletin of Electrical Engineering and Informatics 11, no. 5 (October 1, 2022): 2856–65. http://dx.doi.org/10.11591/eei.v11i5.4314.

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The aim of this paper is to integrate security and privacy in mmWave communications. MmWave communication mechanism access three major key components of secure communication (SC) operations. proposed design for mmWave communication facilitates the detection of the primary signal in physical (PHY) layer to find the spectrum throughput for primary user (PU) and secondary user (SU). The throughput of SC for PU with maximum throughput being recorded at 0.7934 while maximum throughput for SU is recorded at 0.7679. So, we will design a mmWave communication mechanism for solving this problem. The probability for sensing where the probability of detection (PD) is predicted at a defined range of 690 km with an estimated accuracy of 83.56% while the probability of false alarm (PFA) is predicted at a defined range of 230 km with an estimated accuracy of 81.39%. This conflicting but interrelated issue is investigated over three stages for the purpose of solving with a cross-layer model with MAC and PHY layers for a secure communication network (SCN) while reducing the collision effect concurrently with a 92.76% for both cross-layers. MATLAB 2019b would be forwarded in use as the increasing demand for augmenting the bandwidth in secure communications has actuated the evolutionary technology.

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Takeuchi, Akikazu, and Koichi Furukawa. "Bounded buffer communication in Concurrent Prolog." New Generation Computing 3, no. 2 (June 1985): 145–55. http://dx.doi.org/10.1007/bf03037066.

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Loch, Christoph H., and Christian Terwiesch. "Communication and Uncertainty in Concurrent Engineering." Management Science 44, no. 8 (August 1998): 1032–48. http://dx.doi.org/10.1287/mnsc.44.8.1032.

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Wheeler, R., R. W. Burnett, and A. Rosenblatt. "Concurrent engineering: success stories in instrumentation, communications." IEEE Spectrum 28, no. 7 (July 1991): 32–37. http://dx.doi.org/10.1109/6.83465.

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Du, Yijie, Nan Cong, Xiaogang Wei, Xiaonan Zhang, Wenhao Luo, Jun He, and Renfu Yang. "Realization of multiband communications using different Rydberg final states." AIP Advances 12, no. 6 (June 1, 2022): 065118. http://dx.doi.org/10.1063/5.0095780.

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Rydberg atoms can serve as an atomic radio frequency receiver for digital and analog information transmission. In this paper, a ladder-type electromagnetically induced transparency system is prepared in a room temperature cesium atomic vapor cell. Microwave electric fields in the Ku band at a frequency of 12.52 GHz and the Ka band at a frequency of 39.80 GHz are used as two-channel communication carriers to demonstrate concurrent information transmission. Analog and digital communications are demonstrated by performing audio and pseudo-random binary sequence signal transmission, respectively. The dynamic range of the proposed system is ∼50 dB, and the communication bandwidth is more than 10 MHz. The obtained results demonstrate the fundamental principles of two- or multi-band communication systems based on different Rydberg final states.

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Vappangi, Suseela, and V. V. Mani. "Concurrent illumination and communication: A survey on Visible Light Communication." Physical Communication 33 (April 2019): 90–114. http://dx.doi.org/10.1016/j.phycom.2018.12.017.

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Waweru, Miring’u Edward, Prof M. M. Sakwa, and Dr Julius Bosire. "Information Source Attributes and Terrorism Risk Preparedness among the Residents of Nairobi City County." American Journal of Communication 6, no. 1 (March 25, 2024): 24–45. http://dx.doi.org/10.47672/ajc.1887.

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Purpose: The main purpose of the study was to establish the association of source attributes and terrorism risk preparedness among the residents of Nairobi City County. Materials and Methods: This study followed a mixed-methods design comprising mainly of a questionnaire survey complemented by observation, key informant interviews and document analysis, The design employed the Concurrent Convergent (Triangulation) Parallel strategy. According to the Kenya National Bureau of Statistics, Nairobi City County has a resident population of 4,397,073. A further estimated 2.5 million non-residents visit the city-county daily for business, work, or as tourists and travelers in transit to other counties. Therefore, the target population for this study was approximately 6.5 million. The study population was drawn using stratified purposive random sampling technique where the list of all the sampling locations was categorized into four strata. The sample size was 640 respondents who were proportionately randomly drawn from four different strata. Findings: Regression of coefficients showed that source attributes and terrorism risk preparedness were positively and significantly related (β=0.379, p=0.000). Specifically, 53.6% of the respondents agreed with the statement that receiving information from credible sources on terrorism attacks provides motivation for preparedness in case of a terrorist attack. Similarly, 64.8% agreed with the statement that consistency in terrorism risks communications provides motivation to preparedness behaviour adoption 62.6% of the respondents were in concurrence that competence among that communication terrorism risk preparedness was a motivating factor for preparedness. Further, only 43.1% of the respondents indicated that their organisations were using experts in terrorism risk communication and preparedness. 64.6% were of the opinion that involving non experts in decisions related to terrorism risk communications and preparedness can result in preparedness action taking laxity. Implications to Theory, Practice and Policy: The study recommends that professionals charged with emergency risk communication for terrorism preparedness should particularly: demonstrate expertise and competence in the subject matter to instill confidence in their audiences that the information is reliable and useful. This can be achieved by involving qualified professionals, experts, or organizations with relevant experience in emergency risk preparedness and build trust by being transparent, honest, and reliable in communication. Trust can also be enhanced by providing accurate information, acknowledging uncertainties when applicable, and addressing any concerns or doubts promptly.

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Chen, Jessie Y. C. "Concurrent Performance of Military and Robotics Tasks and Effects of Cueing in a Simulated Multi-Tasking Environment." Presence: Teleoperators and Virtual Environments 18, no. 1 (February 1, 2009): 1–15. http://dx.doi.org/10.1162/pres.18.1.1.

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We simulated a military mounted crewstation environment and conducted two experiments to examine the workload and performance of the combined position of gunner and robotics operator. The robotics tasks involved managing a semi-autonomous ground robot or teleoperating a ground robot to conduct reconnaissance tasks. We also evaluated whether aided target recognition (AiTR) capabilities (delivered either through tactile or tactile + visual cueing) for the gunnery task might benefit the concurrent robotics and communication tasks. Results showed that participants' gunnery task performance degraded significantly when they had to concurrently monitor, manage, or teleoperate an unmanned ground vehicle compared to the gunnery-single task condition. When there was AiTR to assist them with their gunnery task, operators' concurrent performance of robotics and communication tasks improved significantly. However, there was a tendency for participants to over-rely on automation when task load was heavy, and performance degradations were observed in instances where automation failed to be entirely reliable. Participants' spatial ability was found to be a reliable predictor of robotics task performance, although the performance gap between those with higher and lower spatial ability appeared to be narrower when the AiTR was available to assist the gunnery task. Participants' perceived workload increased consistently as the concurrent task conditions became more challenging and when their gunnery task was unassisted. Individual difference factors such as spatial ability and perceived attentional control were found to correlate significantly with some of the performance measures. Implications for military personnel selection were discussed.

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R Slagle, Derek, J. J. McIntyre, April Chatham-Carpenter, and Heather Ann Reed. "The perfect storm in the midst of a pandemic: the use of information within an institution's concurrent crises." Online Information Review 45, no. 4 (February 23, 2021): 656–71. http://dx.doi.org/10.1108/oir-09-2020-0415.

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PurposeThe purpose of this study is to examine the types of information that were shared by the institution, and faculty/staff responses to the information shared, with the goal of providing recommendations for other institutions facing concurrent crises.Design/methodology/approachThis mixed-methods case study examines a public university's experiences managing the Covid-19 pandemic crisis while simultaneously navigating financial challenges that had been building over time. Using data from university-wide mediated communications and a survey of on-campus stakeholders during the Covid-19 pandemic and university retrenchment process, this paper explores institutional communication, stakeholder response to organizational communication and faculty/staff reactions to information in the midst of concurrent crises.FindingsThe study found that the university used instructing and advising information within its messages from its top administrator but fell short of incorporating empathy for its stakeholders in its initial responses.Research limitations/implicationsUsing the situational crisis communication theory (Coombs, 2019), which recommends the use of an ethical base response to crises, implications are provided for other organizations facing concurrent crises during the Covid-19 pandemic, to also incorporate empathy in their messages to stakeholders whose livelihoods are being affected, across multiple platforms.Originality/valueWeathering the Covid-19 pandemic and long-term financial pitfalls have proven to be a disruptive phenomenon for higher education institutions. This research expands understanding of institutional communication and stakeholder reactions in a higher education institution facing both the Covid-19 crisis and a retrenchment.Peer reviewThe peer-review history for this article is available at: https://publons.com/publon/10.1108/OIR-09-2020-0415.

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Al Guqhaiman, Ahmed Al, Oluwatobi Akanbi, Amer Aljaedi, Adel R. Alharbi, and C. Edward Chow. "DAMAC: A Delay-Aware MAC Protocol for Ad Hoc Underwater Acoustic Sensor Networks." Sensors 21, no. 15 (August 2, 2021): 5229. http://dx.doi.org/10.3390/s21155229.

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In a channel shared by several nodes, the scheduling algorithm is a key factor to avoiding collisions in the random access-based approach. Commonly, scheduling algorithms can be used to enhance network performance to meet certain requirements. Therefore, in this paper we propose a Delay-Aware Media Access Control (DAMAC) protocol for monitoring time-sensitive applications over multi-hop in Underwater Acoustic Sensor Networks (UASNs), which relies on the random access-based approach where each node uses Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) to determine channel status, switches nodes on and off to conserve energy, and allows concurrent transmissions to improve the underwater communication in the UASNs. In addition, DAMAC does not require any handshaking packets prior to data transmission, which helps to improve network performance in several metrics. The proposed protocol considers the long propagation delay to allow concurrent transmissions, meaning nodes are scheduled to transmit their data packets concurrently to exploit the long propagation delay between underwater nodes. The simulation results show that DAMAC protocol outperforms Aloha, BroadcastMAC, RMAC, Tu-MAC, and OPMAC protocols under varying network loads in terms of energy efficiency, communication overhead, and fairness of the network by up to 65%, 45%, and 726%, respectively.

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DAVE, Shruti, Ann M. MASTERGEORGE, and Lesley B. OLSWANG. "Motherese, affect, and vocabulary development: dyadic communicative interactions in infants and toddlers." Journal of Child Language 45, no. 4 (February 19, 2018): 917–38. http://dx.doi.org/10.1017/s0305000917000551.

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AbstractResponsive parental communication during an infant's first year has been positively associated with later language outcomes. This study explores responsivity in mother–infant communication by modeling how change in guiding language between 7 and 11 months influences toddler vocabulary development. In a group of 32 mother–child dyads, change in early maternal guiding language positively predicted child language outcomes measured at 18 and 24 months. In contrast, a number of other linguistic variables – including total utterances and non-guiding language – did not correlate with toddler vocabulary development, suggesting a critical role of responsive change in infant-directed communication. We further assessed whether maternal affect during early communication influenced toddler vocabulary outcomes, finding that dominant affect during early mother–infant communications correlated to lower child language outcomes. These findings provide evidence that responsive parenting should not only be assessed longitudinally, but unique contributions of language and affect should also be concurrently considered in future study.

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Avasare, Prabhat, Jeroen Declerck, Miguel Glassee, Amir Amin, Erik Umans, Praveen Raghavan, and Martin Palkovic. "Design Flow for Silicon Chip Implementing Novel Platform Architecture for Wireless Communication." International Journal of Embedded and Real-Time Communication Systems 4, no. 1 (January 2013): 42–63. http://dx.doi.org/10.4018/jertcs.2013010103.

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In current era of complex chip designs targeting wireless mobile terminals, architects and designers need to conform to tight design constraints – both in terms of performance (e.g. execution time, silicon area, energy consumption) and time-to-market. Further, additional flexibility is required in these designs to handle multiple wireless standards, sometimes even concurrently. To achieve these challenging goals, the authors introduce a platform architecture that uses a decentralized control to minimize communication and control overhead while keeping timing predictable by using state-of-the-art components and a novel interconnect. The authors demonstrate three main achievements in running multiple wireless standards on their platform: 1.053Gbps 4x4 80MHz WLAN 802.11ac receiver data path meeting the SIFS timing with a latency of 12.5µs, dual concurrent 173Mbps 2x2 20MHz Cat-4 3GPP-LTE receiver and platform reconfiguration from WLAN 11n receiver to 3GPP-LTE one in 52µs. Further the authors describe the design flow used to prepare main components of our platform architecture for a tape-out, while especially keeping a close eye on energy consumption. We believe that our chip design flow is generic and can be used in other custom processor chip designs even outside wireless domain.

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Zheng, Yang, and Xiaogang Hu. "Concurrent Prediction of Finger Forces Based on Source Separation and Classification of Neuron Discharge Information." International Journal of Neural Systems 31, no. 06 (February 4, 2021): 2150010. http://dx.doi.org/10.1142/s0129065721500106.

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A reliable neural-machine interface is essential for humans to intuitively interact with advanced robotic hands in an unconstrained environment. Existing neural decoding approaches utilize either discrete hand gesture-based pattern recognition or continuous force decoding with one finger at a time. We developed a neural decoding technique that allowed continuous and concurrent prediction of forces of different fingers based on spinal motoneuron firing information. High-density skin-surface electromyogram (HD-EMG) signals of finger extensor muscle were recorded, while human participants produced isometric flexion forces in a dexterous manner (i.e. produced varying forces using either a single finger or multiple fingers concurrently). Motoneuron firing information was extracted from the EMG signals using a blind source separation technique, and each identified neuron was further classified to be associated with a given finger. The forces of individual fingers were then predicted concurrently by utilizing the corresponding motoneuron pool firing frequency of individual fingers. Compared with conventional approaches, our technique led to better prediction performances, i.e. a higher correlation ([Formula: see text] versus [Formula: see text]), a lower prediction error ([Formula: see text]% MVC versus [Formula: see text]% MVC), and a higher accuracy in finger state (rest/active) prediction ([Formula: see text]% versus [Formula: see text]%). Our decoding method demonstrated the possibility of classifying motoneurons for different fingers, which significantly alleviated the cross-talk issue of EMG recordings from neighboring hand muscles, and allowed the decoding of finger forces individually and concurrently. The outcomes offered a robust neural-machine interface that could allow users to intuitively control robotic hands in a dexterous manner.

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Cheng, J., K. Araki, and K. Ushijima. "Tasking communication deadlocks in concurrent Ada programs." ACM SIGAda Ada Letters VIII, no. 5 (September 1988): 61–70. http://dx.doi.org/10.1145/51624.51627.

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Al-Saqabi, Khaled, Kassem Saleh, and Imtiaz Ahmad. "Recovery from concurrent failures in communication protocols." Journal of Systems and Software 35, no. 1 (October 1996): 55–65. http://dx.doi.org/10.1016/0164-1212(95)00085-2.

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Fiore, M., C. Casetti, and G. Galante. "Concurrent multipath communication for real-time traffic." Computer Communications 30, no. 17 (November 2007): 3307–20. http://dx.doi.org/10.1016/j.comcom.2006.12.016.

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Iannello, G., and N. Mazzocca. "Communication Workload Analysis for Symmetrical Concurrent Systems." Journal of Parallel and Distributed Computing 20, no. 2 (February 1994): 224–35. http://dx.doi.org/10.1006/jpdc.1994.1021.

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Wang, Zhe, Yifeng Cao, Linghe Kong, Guihai Chen, Jiadi Yu, Shaojie Tang, and Yingying Chen. "Reference Waveforms Forward Concurrent Transmissions in ZigBee Communications." IEEE/ACM Transactions on Networking 28, no. 4 (August 2020): 1629–42. http://dx.doi.org/10.1109/tnet.2020.2992271.

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BONELLI, EDUARDO, ADRIANA COMPAGNONI, and ELSA GUNTER. "Correspondence assertions for process synchronization in concurrent communications." Journal of Functional Programming 15, no. 2 (March 2005): 219–47. http://dx.doi.org/10.1017/s095679680400543x.

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High-level specification of patterns of communications such as protocols can be modeled elegantly by means of session types (Honda et al., 1998). However, a number of examples suggest that session types fall short when finer precision on protocol specification is required. In order to increase the expressiveness of session types we appeal to the theory of correspondence assertions (Clarke & Marrero, 1998; Gordon & Jeffrey, 2003b). The resulting type discipline augments the types of long-term channels with effects and thus yields types which may depend on messages read or written earlier within the same session. This new type system can be used to check: source of information,whether data is propagated as specified across multiple parties,if there are unspecified communications between parties, andif the data being exchanged has been modified by the code in an unspecified way. We prove that evaluation preserves typability and that well-typed processes are safe. Also, we illustrate how the resulting theory allows us to address shortcomings present in the pure theory of session types.

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Bonelli, Eduardo, Adriana Compagnoni, and Elsa Gunter. "Correspondence Assertions for Process Synchronization in Concurrent Communications." Electronic Notes in Theoretical Computer Science 97 (July 2004): 175–95. http://dx.doi.org/10.1016/j.entcs.2004.04.036.

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Kfoury, A. J., and P. Urzyczyn. "Concurrent Program Schemes." Fundamenta Informaticae 10, no. 4 (October 1, 1987): 337–61. http://dx.doi.org/10.3233/fi-1987-10402.

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We study the programming formalism FD of “flow-diagrams” to which we gradually add various features of concurrency. The weakest form of concurrency is introduced by the construct “and”, which is dual to the nondeterministic choice “or” and plays a role similar to universal states in alternating Turing machines. Stronger (and more realistic) forms of concurrency are obtained when processes are allowed to communicate. We consider communication by channels and communication by messages. We calibrate the computational power of classes of concurrent programs FD+α against that of sequential programs, where α is the addition of one of the following features: {and}, {and, or}, {and, or, channels}, or {and, or, messages}.

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Saha, Mousumi, Nobuo Funabiki, Rahardhita Widyatra Sudibyo, Sumon Kumar Debnath, Md Manowarul Islam, Minoru Kuribayashi, and Wen-Chung Kao. "A Network Configuration Optimization Algorithm for Wireless Local-Area Network with Three Raspberry Pi Access-Points under Concurrent Communications." International Journal of Future Computer and Communication 8, no. 2 (June 2019): 55–62. http://dx.doi.org/10.18178/ijfcc.2019.8.2.540.

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Yan, Yubo, Panlong Yang, Jie Xiong, and Xiang-Yang Li. "OpenCarrier: Breaking the User Limit for Uplink MU-MIMO Transmissions With Coordinated APs." ACM Transactions on Sensor Networks 18, no. 2 (May 31, 2022): 1–21. http://dx.doi.org/10.1145/3488382.

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The global IoT market is experiencing a fast growth with a massive number of IoT/wearable devices deployed around us and even on our bodies. This trend incorporates more users to upload data frequently and timely to the APs. Previous work mainly focus on improving the up-link throughput. However, incorporating more users to transmit concurrently is actually more important than improving the throughout for each individual user, as the IoT devices may not require very high transmission rates but the number of devices is usually large. In the current state-of-the-arts (up-link MU-MIMO), the number of transmissions is either confined to no more than the number of antennas (node-degree-of-freedom, node-DoF) at an AP or clock synchronized with cables between APs to support more concurrent transmissions. However, synchronized APs still incur a very high collaboration overhead, prohibiting its real-life adoption. We thus propose novel schemes to remove the cable-synchronization constraint while still being able to support more concurrent users than the node-DoF limit, and at the same time minimize the collaboration overhead. In this paper, we design, implement, and experimentally evaluate OpenCarrier, the first distributed system to break the user limitation for up-link MU-MIMO networks with coordinated APs. Our experiments demonstrate that OpenCarrier is able to support up to five up-link high-throughput transmissions for MU-MIMO network with 2-antenna APs.

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Rajalakshmi, N. R., Ankur Dumka, Manoj Kumar, Rajesh Singh, Anita Gehlot, Shaik Vaseem Akram, Divya Anand, Dalia H. Elkamchouchi, and Irene Delgado Noya. "A Cost-Optimized Data Parallel Task Scheduling with Deadline Constraints in Cloud." Electronics 11, no. 13 (June 28, 2022): 2022. http://dx.doi.org/10.3390/electronics11132022.

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Large-scale distributed systems have the advantages of high processing speeds and large communication bandwidths over the network. The processing of huge real-world data within a time constraint becomes tricky, due to the complexity of data parallel task scheduling in a time constrained environment. This paper proposes data parallel task scheduling in cloud to address the minimization of cost and time constraints. By running concurrent executions of tasks on multi-core cloud resources, the number of parallel executions could be increased correspondingly, thereby, finishing the task within the deadline is possible. A mathematical model is developed here to minimize the operational cost of data parallel tasks by feasibly assigning a load to each virtual machine in the cloud data center. This work experiments with a machine learning model that is replicated on the multi-core cloud heterogeneous resources to execute different input data concurrently to accomplish distributive learning. The outcome of concurrent execution of data-intensive tasks on different parts of the input dataset gives better solutions in terms of processing the task by the deadline at optimized cost.

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Li, Shiyong, Wei Sun, Yaming Zhang, and Haiou Liu. "Reliability Analysis for Multipath Communications in Mobile Cloud Computing Architectures." Wireless Communications and Mobile Computing 2018 (June 19, 2018): 1–12. http://dx.doi.org/10.1155/2018/8539307.

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Mobile cloud computing (MCC) has gained much attention from both academia and industry in recent years. It can support new types of services, such as m-commerce, m-learning, and mobile healthcare, and enrich mobile users’ experience and satisfaction by taking full advantage of cloud computing. In MCC architectures multipath communications can be achieved with multihomed mobile devices, so as to utilize multiple paths for data transmission in parallel. They can achieve better utilization of bandwidth resource, split traffic for load balancing, and enhance reliability, fault tolerance, and robustness for applications. However, little attention has been paid to model the reliability of multipath communications in case of path failure. In this paper we investigate the reliability of concurrent multipath communications in MCC architectures and propose two reliability models when paths are failure. One is for static path failure where the failed paths cannot recover for communication in some delay time. The other is for dynamic path failure where the failed paths can recover in some delay time. Finally, numerical results are given to illustrate the reliability of multipath communications.

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Lock, Irina, and Peter Seele. "Measuring Credibility Perceptions in CSR Communication: A Scale Development to Test Readers’ Perceived Credibility of CSR Reports." Management Communication Quarterly 31, no. 4 (May 10, 2017): 584–613. http://dx.doi.org/10.1177/0893318917707592.

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Credibility is central to communication but often jeopardized by “credibility gaps.” This is especially true for communication about corporate social responsibility (CSR). To date, no tool has been available to analyze stakeholders’ credibility perceptions of CSR communication. This article presents a series of studies conducted to develop a scale to assess the perceived credibility of CSR reports, one of CSR communication’s most important tools. The scale provides a novel operationalization of credibility using validity claims of Habermas’s ideal speech situation as subdimensions. The scale development process, carried out in five studies including a literature review, a Delphi study, and three validation studies applying confirmatory factor analysis, resulted in the 16-item Perceived Credibility (PERCRED) scale. The scale shows convergent, discriminant, concurrent, and nomological validity and is the first validated measure for analyzing credibility perceptions of CSR reports.

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Rishitha, Challa, Mallikanti Bhavana, Pendem Sriya, and Dr Y. Sreenivasulu. "Gesture Vocalizer Using Flex Sensor and Software Visualization." International Journal for Research in Applied Science and Engineering Technology 10, no. 6 (June 30, 2022): 472–86. http://dx.doi.org/10.22214/ijraset.2022.43737.

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Abstract: People have the voice ability for communicating among one another. Tragically, not every person has the ability to talk and hear. Gesture based communication utilized among the local area of individuals who are distinctive abled as the methods for correspondence. Communication through signing is a motion portrayal that includes concurrent joining hand shapes and development of the hands, arms or body, and looks to communicate. The people who can't talk utilizes the gesture based communications to speak with other individual vocally hindered individual and even with other ordinary individuals who knows the implications of gesture based communications or an interpreter is expected to decipher the implications of gesture based communications to others who can talk and do comprehend the gesture based communications. In any case, it's anything but consistently workable for a person to associate with constantly to decipher the communications via gestures and not every person can gain proficiency with the communications through signing. In this way, another option is that we can utilize a gadget Gesture Vocalizer as an arbiter. The Gesture Vocalizer can take the motions a contribution from the vocally impeded individual and interaction it's anything but a literary and sound type of yield. Hardware version of the project Gesture Vocalizer is a multi-microcontroller-based framework being intended to work with the correspondence among the imbecilic, hard of hearing and visually impaired networks and their correspondence with the ordinary individuals. This system can be flexibly changed to function as a "smart device.". In this project we showcases a gesture vocalizer based on a microcontroller and sensors. Gesture vocalizer designed is basically a hand glove and a microcontroller system

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Eliab, Ayinebyona, Yonghwi Kim, Joosang Lee, Jeong-Gun Lee, and Jungmin So. "G-DCF: Improving System Spectral Efficiency through Concurrent Transmissions in Wireless LANs." Wireless Communications and Mobile Computing 2019 (September 11, 2019): 1–16. http://dx.doi.org/10.1155/2019/5427573.

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This paper presents G-DCF, a MAC protocol for wireless LANs that can improve system spectral efficiency of wireless LANs by allowing more concurrent transmissions. The 802.11 DCF creates exposed terminals which are nodes that can transmit successfully but are blocked by carrier sensing. More potential exposed terminals are created when APs are densely placed, limiting spatial reuse of channels and thus system throughput. In order to allow concurrent transmissions from exposed terminals, G-DCF establishes groups in the network. Members of a group are nodes located within the carrier sense range of each other but can transmit packets concurrently. Whenever one member of a group wins the channel and transmits its packet, other nodes in the group also start transmission, triggered by the group ID included in the preamble. Contention window is adjusted according to the group size for fair share of the channel. Performance evaluations show that G-DCF can significantly improve system throughput and fairness over 802.11 DCF, especially when the APs are densely deployed.

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Journal articles on the topic 'Communications concurrentes'

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