Displaying publications 101 - 120 of 548 in total

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  1. Nurses should be empowered to be proactively involved in family decision meetings on intensive care unit patient care decisions
    Khan M
    Evid Based Nurs, 2020 10;23(4):114.
    PMID: 31511244 DOI: 10.1136/ebnurs-2019-103089
    Matched MeSH terms: Communication
  2. Fulltext Inter-professional ethical values in Iranian aged care: a qualitative study
    Hosseinabadi R, Abolfathi Momtaz Y, Mohammdi Shahboulaghi F, Abbaszadeh A, Ali Akbari Kamrani A, Pournia Y
    Med Glas (Zenica), 2020 Feb 01;17(1):206-215.
    PMID: 31432658 DOI: 10.17392/1049-20
    Aim Ethical values are the basis of the behaviour and performance of professional care staff. This study aimed to identify inter-professional ethical values in aged care. Methods This qualitative thematic content analysis study was conducted in Khorramabad, Iran, from September 2018 to June 2109, and 36 core members of the aged care team (including 24 nurses, 5 physicians, 3 physiotherapists, and 4 social workers) were selected through the purposive sampling method and interviewed in depth. The data were analysed using the directed content analysis and the method of Zhang and Wildemuth. Results Four main themes of providing professional care, preserving the integrity of the aged, observing the dignity of the aged, establishing human relationship, along with 21 subthemes were extracted as ethical values in aged care. Conclusion The results of this study indicate that providing ethical aged care is influenced by the specific conditions of this age group. In addition to general ethical values such as providing professional care, providing ethical aged care is based on ethical values such as promoting social interaction, promoting peace and comfort, preserving and promoting independence, and autonomy in aged care. Promoting collaborative care and paying more attention to the human dimensions of communication and interaction were other emphasized values.
    Matched MeSH terms: Communication
  3. Fulltext QoSRP: A Cross-layer QoS Channel-Aware Routing Protocol for the Internet of Underwater Acoustic Sensor Networks
    Faheem M, Butt RA, Raza B, Alquhayz H, Ashraf MW, Shah SB, et al.
    Sensors (Basel), 2019 Nov 02;19(21).
    PMID: 31684014 DOI: 10.3390/s19214762
    Quality of service (QoS)-aware data gathering in static-channel based underwater wireless sensor networks (UWSNs) is severely limited due to location and time-dependent acoustic channel communication characteristics. This paper proposes a novel cross-layer QoS-aware multichannel routing protocol called QoSRP for the internet of UWSNs-based time-critical marine monitoring applications. The proposed QoSRP scheme considers the unique characteristics of the acoustic communication in highly dynamic network topology during gathering and relaying events data towards the sink. The proposed QoSRP scheme during the time-critical events data-gathering process employs three basic mechanisms, namely underwater channel detection (UWCD), underwater channel assignment (UWCA) and underwater packets forwarding (UWPF). The UWCD mechanism finds the vacant channels with a high probability of detection and low probability of missed detection and false alarms. The UWCA scheme assigns high data rates channels to acoustic sensor nodes (ASNs) with longer idle probability in a robust manner. Lastly, the UWPF mechanism during conveying information avoids congestion, data path loops and balances the data traffic load in UWSNs. The QoSRP scheme is validated through extensive simulations conducted by NS2 and AquaSim 2.0 in underwater environments (UWEs). The simulation results reveal that the QoSRP protocol performs better compared to existing routing schemes in UWSNs.
    Matched MeSH terms: Communication; Communications Media
  4. Fulltext Final year students’ performance in communication skills OSCE in a Malaysian medical school
    Chan, S.C., Sandheep, S., Lee, S.L.
    Asian Journal of Medicine and Health Sciences, 2018;1(1):32-37.
    MyJurnal
    Introduction: The Royal College of Medicine Perak under Universiti Kuala Lumpur started its own undergraduate medical degree programme in 2007. As part of the review and evaluation of communication skills (CS) training, the performance of the two pioneer batches of final year students in CS Objective Structured Clinical Examinations (OSCEs) stations in the 2012 and 2013 were analysed.
    Methods: The CS OSCE stations were analysed based on the percentage of students obtaining a satisfactory performance in each CS component. Overall performance in each CS component was considered satisfactory, if ≥ 50% of students achieved satisfactory performance or unsatisfactory, if < 50% of students achieved satisfactory performance. The two cohorts were compared for any significant statistical difference (p < 0.05) in their performance.
    Results: Satisfactory performance was obtained in basic CS (courtesy, appropriate non-verbal and verbal CS), stating intention of session, recognizing patient’s cues, checking and addressing patient’s perceptions and concerns, checking patient’s understanding, breaking bad news and maintaining a professional attitude. The performance was unsatisfactory in assessing prior knowledge, discussing patient management and checking patient’s coping skills. Both the two cohorts’ performance did not differ significantly.
    Conclusion: Overall the students’ performance was satisfactory except for assessing prior knowledge, discussing management and checking patients’ coping skills.
    Matched MeSH terms: Communication
  5. Fulltext Liquid Metal Antennas: Materials, Fabrication and Applications
    Paracha KN, Butt AD, Alghamdi AS, Babale SA, Soh PJ
    Sensors (Basel), 2019 Dec 28;20(1).
    PMID: 31905646 DOI: 10.3390/s20010177
    This work reviews design aspects of liquid metal antennas and their corresponding applications. In the age of modern wireless communication technologies, adaptability and versatility have become highly attractive features of any communication device. Compared to traditional conductors like copper, the flow property and lack of elasticity limit of conductive fluids, makes them an ideal alternative for applications demanding mechanically flexible antennas. These fluidic properties also allow innovative antenna fabrication techniques like 3D printing, injecting, or spraying the conductive fluid on rigid/flexible substrates. Such fluids can also be easily manipulated to implement reconfigurability in liquid antennas using methods like micro pumping or electrochemically controlled capillary action as compared to traditional approaches like high-frequency switching. In this work, we discuss attributes of widely used conductive fluids, their novel patterning/fabrication techniques, and their corresponding state-of-the-art applications.
    Matched MeSH terms: Communication
  6. Fulltext A Survey on Underwater Wireless Sensor Networks: Requirements, Taxonomy, Recent Advances, and Open Research Challenges
    Fattah S, Gani A, Ahmedy I, Idris MYI, Targio Hashem IA
    Sensors (Basel), 2020 Sep 21;20(18).
    PMID: 32967124 DOI: 10.3390/s20185393
    The domain of underwater wireless sensor networks (UWSNs) had received a lot of attention recently due to its significant advanced capabilities in the ocean surveillance, marine monitoring and application deployment for detecting underwater targets. However, the literature have not compiled the state-of-the-art along its direction to discover the recent advancements which were fuelled by the underwater sensor technologies. Hence, this paper offers the newest analysis on the available evidences by reviewing studies in the past five years on various aspects that support network activities and applications in UWSN environments. This work was motivated by the need for robust and flexible solutions that can satisfy the requirements for the rapid development of the underwater wireless sensor networks. This paper identifies the key requirements for achieving essential services as well as common platforms for UWSN. It also contributes a taxonomy of the critical elements in UWSNs by devising a classification on architectural elements, communications, routing protocol and standards, security, and applications of UWSNs. Finally, the major challenges that remain open are presented as a guide for future research directions.
    Matched MeSH terms: Communication
  7. Fulltext Advertising appeals and cultural values of video advertising in Thailand
    Cheryl, Shee Yu Peh, Norazirah, Ayob
    Trends in Undergraduate Research, 2020;3(1):1-8.
    MyJurnal
    In recent years, Thailand videos advertising is generally known as the leading producer of weep-worthy viral videos in the world. Reasons for Thailand advertisements to stand out from the rest is said to be because of its commonly used advertising appeals, and cultural values focused in majority of Thailand advertisements. This research aims to study advertising appeals and cultural values in Thailand video advertisements. Specifically, the research investigates the reflection of cultural value through advertising appeal through the executional framework in Thailand video advertisements. This exploratory research employs primarily the method of ethnography in order to understand how cultural values are reflected through the advertising appeals in video advertisements from Thailand. The result shows that the most commonly used advertising appeal are Family Appeal, followed by Health Appeal and Effective Appeal. In terms of cultural values, the result shows the Thailand’s advertisements are skewed slightly higher towards collectivism and femininity. Majority of the Thailand video advertisements are using executional framework of storytelling.
    Matched MeSH terms: Communication; Communications Media
  8. Fulltext Mechanism to prevent the abuse of IPv6 fragmentation in OpenFlow networks
    Al-Ani A, Anbar M, Laghari SA, Al-Ani AK
    PLoS One, 2020;15(5):e0232574.
    PMID: 32392261 DOI: 10.1371/journal.pone.0232574
    OpenFlow makes a network highly flexible and fast-evolving by separating control and data planes. The control plane thus becomes responsive to changes in topology and load balancing requirements. OpenFlow also offers a new approach to handle security threats accurately and responsively. Therefore, it is used as an innovative firewall that acts as a first-hop security to protect networks against malicious users. However, the firewall provided by OpenFlow suffers from Internet protocol version 6 (IPv6) fragmentation, which can be used to bypass the OpenFlow firewall. The OpenFlow firewall cannot identify the message payload unless the switch implements IPv6 fragment reassembly. This study tests the IPv6 fragmented packets that can evade the OpenFlow firewall, and proposes a new mechanism to guard against attacks carried out by malicious users to exploit IPv6 fragmentation loophole in OpenFlow networks. The proposed mechanism is evaluated in a simulated environment by using six scenarios, and results exhibit that the proposed mechanism effectively fixes the loophole and successfully prevents the abuse of IPv6 fragmentation in OpenFlow networks.
    Matched MeSH terms: Computer Communication Networks
  9. Fulltext A Low-Cost Information Monitoring System for Smart Farming Applications
    Saqib M, Almohamad TA, Mehmood RM
    Sensors (Basel), 2020 Apr 22;20(8).
    PMID: 32331212 DOI: 10.3390/s20082367
    A low-cost, low-power, and low data-rate solution is proposed to fulfill the requirements of information monitoring for actual large-scale agricultural farms. A small-scale farm can be easily managed. By contrast, a large farm will require automating equipment that contributes to crop production. Sensor based soil properties measurement plays an integral role in designing a fully automated agricultural farm, also provides more satisfactory results than any manual method. The existing information monitoring solutions are inefficient in terms of higher deployment cost and limited communication range to adapt the need of large-scale agriculture farms. A serial based low-power, long-range, and low-cost communication module is proposed to confront the challenges of monitoring information over long distances. In the proposed system, a tree-based communication mechanism is deployed to extend the communication range by adding intermediate nodes. Each sensor node consists of a solar panel, a rechargeable cell, a microcontroller, a moisture sensor, and a communication unit. Each node is capable to work as a sensor node and router node for network traffic. Minimized data logs from the central node are sent daily to the cloud for future analytics purpose. After conducting a detailed experiment in open sight, the communication distance measured 250 m between two points and increased to 750 m by adding two intermediate nodes. The minimum working current of each node was 2 mA, and the packet loss rate was approximately 2-5% on different packet sizes of the entire network. Results show that the proposed approach can be used as a reference model to meet the requirements for soil measurement, transmission, and storage in a large-scale agricultural farm.
    Matched MeSH terms: Communication
  10. Fulltext Hybrid Multi-Level Detection and Mitigation of Clone Attacks in Mobile Wireless Sensor Network (MWSN)
    Shaukat HR, Hashim F, Shaukat MA, Ali Alezabi K
    Sensors (Basel), 2020 Apr 17;20(8).
    PMID: 32316487 DOI: 10.3390/s20082283
    Wireless sensor networks (WSNs) are often deployed in hostile environments, where an adversary can physically capture some of the sensor nodes. The adversary collects all the nodes' important credentials and subsequently replicate the nodes, which may expose the network to a number of other security attacks, and eventually compromise the entire network. This harmful attack where a single or more nodes illegitimately claims an identity as replicas is known as the node replication attack. The problem of node replication attack can be further aggravated due to the mobile nature in WSN. In this paper, we propose an extended version of multi-level replica detection technique built on Danger Theory (DT), which utilizes a hybrid approach (centralized and distributed) to shield the mobile wireless sensor networks (MWSNs) from clone attacks. The danger theory concept depends on a multi-level of detections; first stage (highlights the danger zone (DZ) by checking the abnormal behavior of mobile nodes), second stage (battery check and random number) and third stage (inform about replica to other networks). The DT method performance is highlighted through security parameters such as false negative, energy, detection time, communication overhead and delay in detection. The proposed approach also demonstrates that the hybrid DT method is capable and successful in detecting and mitigating any malicious activities initiated by the replica. Nowadays, crimes are vastly increasing and it is crucial to modify the systems accordingly. Indeed, it is understood that the communication needs to be secured by keen observation at each level of detection. The simulation results show that the proposed approach overcomes the weaknesses of the previous and existing centralized and distributed approaches and enhances the performance of MWSN in terms of communication and memory overhead.
    Matched MeSH terms: Computer Communication Networks
  11. Fulltext Ultralow Profile, Low Passive Intermodulation, and Super-Wideband Ceiling Mount Antennas for Cellular and Public Safety Distributed Antenna Systems
    Ng KJ, Islam MT, Alevy AM, Mansor MF
    Sensors (Basel), 2020 Apr 26;20(9).
    PMID: 32357426 DOI: 10.3390/s20092456
    This paper presents an ultralow profile, low passive intermodulation (PIM), and super-wideband in-building ceiling mount antenna that covers both the cellular and public safety ultra high frequency (UHF) band for distributed antenna system (DAS) applications. The proposed antenna design utilizes a modified 2-D planar discone design concept that is miniaturized to fit into a small disc-shaped radome. The 2-D planar discone has an elliptical-shaped disc monopole and a bell-shaped ground plane, a stub at the shorting path, with asymmetrical structure and an additional proximity coupling patch to maximize the available electrical path to support the 350 MHz band range. The proposed design maximizes the radome area with a reduction of about 62% compared to similar concept type antennas. Besides, the proposed design exhibits an improved radiation pattern with null reduction compared to a typical dipole/monopole when lies at the horizontal plane. A prototype was manufactured to demonstrate the antenna performance. The VSWR and radiation pattern results agreed with the simulated results. The proposed antenna achieves a band ratio of 28.57:1 while covering a frequency range of 350-10,000 MHz. The measured passive intermodulation levels are better than -150 dBc (2 × 20 Watts) for 350, 700 and 1920 MHz bands.
    Matched MeSH terms: Computer Communication Networks
  12. Photodentistry - an innovative approach to improving students' empathy and learning experiences in comprehensive patient care
    Ahmad MS, Radhi DSM, Rusle FF, Zul MF, Jalaluddin J, Baharuddin IH
    J Dent Educ, 2020 Nov;84(11):1219-1229.
    PMID: 32645212 DOI: 10.1002/jdd.12295
    OBJECTIVES: Preparing future dental school graduates to provide comprehensive patient care with empathy requires the completion of adequate training in such practice. This study was undertaken to investigate the effectiveness of the Photodentistry learning activity, which uses visual arts, in improving dental students' empathy and learning experience in comprehensive patient care.

    METHODS: All fourth-year undergraduate dental students (n = 69, response rate = 100%) participated in the Photodentistry learning activity developed by specialists from the areas of dentistry, arts, education, and psychology. A survey using the Toronto Empathy Questionnaire (TEQ) was conducted both pretest and posttest, followed by an open-ended written survey of their reflection towards the learning activity. Quantitative data were analyzed via paired t-test (P < 0.05), while qualitative data were analyzed using thematic analysis.

    RESULTS: There was a significant increase in both students' total mean empathy score and the individual scores for 8 (out of 16) items of the TEQ after the learning activity. Students stated that they had an improved understanding of managing patients in a comprehensive manner (e.g., managing medically compromised patients, performing treatment planning, communication with patients who have special health care needs). Students also reported the development of skills (e.g., observation, critical thinking) and positive attitudes (e.g., empathy, responsibility) towards patients.

    CONCLUSION: Photodentistry is an effective learning approach for improving dental students' empathy and learning experience in comprehensive patient care.

    Matched MeSH terms: Communication
  13. Malaysian teachers' experience using augmentative and alternative communication with students
    Joginder Singh S, Diong ZZ, Mustaffa Kamal R
    Augment Altern Commun, 2020 06;36(2):107-117.
    PMID: 32706287 DOI: 10.1080/07434618.2020.1785547
    Teachers play an important role in the successful implementation of augmentative and alternative communication (AAC) for students with complex communication needs. The goal of this two-phase, mixed-methods study was to explore Malaysian teachers' use of, experience with, and perceptions about AAC. Phase 1 involved 252 teachers who completed a questionnaire that was aimed at collecting nationwide data about their use and overall perceptions of AAC. Phase 2 involved semi-structured interviews with 13 teachers who had experience supporting students who used AAC. Approximately half of the participants who completed the questionnaire knew about AAC and had used AAC with their students. Almost all of the participants had positive views of AAC though some misconceptions were reported. Most participants had limited knowledge about AAC that led them to experience difficulties supporting their students. Teachers were motivated to receive AAC-related training to enable them to use AAC more successfully with their students given the small number of SLPs in the country.
    Matched MeSH terms: Communication Aids for Disabled*; Communication Disorders*
  14. Reflections of Malaysian parents of children with developmental disabilities on their experiences with AAC
    Joginder Singh S, Hussein NH, Mustaffa Kamal R, Hassan FH
    Augment Altern Commun, 2017 Jun;33(2):110-120.
    PMID: 28387140 DOI: 10.1080/07434618.2017.1309457
    Parents play an important role in the successful implementation of AAC. Previous research has indicated that parents in different countries have varying perceptions about the use of AAC and face different challenges in its implementation. To date, there is limited information about the use of AAC by children in Malaysia or parents' views about its use. The aim of this study was to explore Malaysian parents' perception of AAC and their experience when supporting their children who use AAC. For this study, 12 parents of children with autism spectrum disorder and cerebral palsy were involved in semi-structured individual interviews. Qualitative content analysis was used to analyze interview data. Following analysis, three themes were identified: (a) impact of the use of AAC, (b) challenges faced, and (c) hopes and expectations. Participants reported that the use of AAC had a positive impact on their children, but that they faced challenges related to the child, the settings, and the system itself, as well as a lack of time and support. Findings from this study provide an insight for Malaysian speech therapists about the challenges faced by parents when supporting their children who use AAC, and how important it is to overcome these challenges to ensure successful implementation of AAC.
    Matched MeSH terms: Communication Aids for Disabled*; Communication Disorders/rehabilitation*
  15. Dynamic normalization of microtexts using SPMAT
    Norlela Samsudin, Mazidah Puteh, Ahmad Nazmi Fadzal, Mohd Tajul Hasnan Mohd Tajuddin
    CREAM : Current Research in Malaysia (Penyelidikan Terkini di Malaysia), 2013;2(2):101-113.
    MyJurnal
    The advancement in communication and Internet technology leads to mass of online data available on the Internet. People communicate to each other with application such as Facebook, Twitter, Short Message Service and e-forum. Entries or posts from these applications are known as microtexts. Normally a microtext is very short, very noisy and does not follow the correct structure of a sentence either in the English language or the Malay language. High occurrence of noisy texts decreases the accuracy value when microtexts are processed. This paper proposes a prototype of a system known as Sistem Penterjemahan Mesej Atas Talian (SPMAT). The objective of the system is to 'clean' noisy texts in microtexts that are created online by the Malaysian. 5000 Facebook messages, 5000 Twitter messages and 5000 e-forum messages were collected. From these sources, few lists such as common noisy texts list, common acronyms list artificial abbreviations list and Bi-gram index were created and used in the normalization processed. In addition, the system kept messages that it normalized and updated the corpus when instructed by the user. The methods used in SPMAT had been tested with 100 online messages. The result indicated that 80% of the noisy texts incorporated in these messages had been identified and cleaned correctly.
    Matched MeSH terms: Communication
  16. Fulltext Sidelobe reduction and capacity improvement of open-loop collaborative beamforming in wireless sensor networks
    Jayaprakasam S, Abdul Rahim SK, Leow CY, Ting TO
    PLoS One, 2017;12(5):e0175510.
    PMID: 28464000 DOI: 10.1371/journal.pone.0175510
    Collaborative beamforming (CBF) with a finite number of collaborating nodes (CNs) produces sidelobes that are highly dependent on the collaborating nodes' locations. The sidelobes cause interference and affect the communication rate of unintended receivers located within the transmission range. Nulling is not possible in an open-loop CBF since the collaborating nodes are unable to receive feedback from the receivers. Hence, the overall sidelobe reduction is required to avoid interference in the directions of the unintended receivers. However, the impact of sidelobe reduction on the capacity improvement at the unintended receiver has never been reported in previous works. In this paper, the effect of peak sidelobe (PSL) reduction in CBF on the capacity of an unintended receiver is analyzed. Three meta-heuristic optimization methods are applied to perform PSL minimization, namely genetic algorithm (GA), particle swarm algorithm (PSO) and a simplified version of the PSO called the weightless swarm algorithm (WSA). An average reduction of 20 dB in PSL alongside 162% capacity improvement is achieved in the worst case scenario with the WSA optimization. It is discovered that the PSL minimization in the CBF provides capacity improvement at an unintended receiver only if the CBF cluster is small and dense.
    Matched MeSH terms: Communication
  17. Fulltext SELAMAT: A New Secure and Lightweight Multi-Factor Authentication Scheme for Cross-Platform Industrial IoT Systems
    Khalid H, Hashim SJ, Ahmad SMS, Hashim F, Chaudhary MA
    Sensors (Basel), 2021 Feb 18;21(4).
    PMID: 33670675 DOI: 10.3390/s21041428
    The development of the industrial Internet of Things (IIoT) promotes the integration of the cross-platform systems in fog computing, which enable users to obtain access to multiple application located in different geographical locations. Fog users at the network's edge communicate with many fog servers in different fogs and newly joined servers that they had never contacted before. This communication complexity brings enormous security challenges and potential vulnerability to malicious threats. The attacker may replace the edge device with a fake one and authenticate it as a legitimate device. Therefore, to prevent unauthorized users from accessing fog servers, we propose a new secure and lightweight multi-factor authentication scheme for cross-platform IoT systems (SELAMAT). The proposed scheme extends the Kerberos workflow and utilizes the AES-ECC algorithm for efficient encryption keys management and secure communication between the edge nodes and fog node servers to establish secure mutual authentication. The scheme was tested for its security analysis using the formal security verification under the widely accepted AVISPA tool. We proved our scheme using Burrows Abdi Needham's logic (BAN logic) to prove secure mutual authentication. The results show that the SELAMAT scheme provides better security, functionality, communication, and computation cost than the existing schemes.
    Matched MeSH terms: Communication
  18. Fulltext Modified algorithm for image watermarking using 2D-DCT and Elgamal Cryptosyst
    Nur Azien Yazid, Kamilah Abdullah, Suhaila Abd Halim
    ESTEEM Academic Journal, 2019;15(1):44-55.
    MyJurnal
    Image watermarking embeds identifying information in an image in such a manner that it cannot easily be removed. For the past several years, image digital watermarking has become a necessary element used for hiding secret image and enabling secured communication such as
    privacy, confidentiality, authentication and data integrity. Although numerous watermarking schemes are present in grayscale images, the present work focuses on the RGB color image. This study proposed a new hybrid method that would satisfy the essential needs of modern image watermarking. The color image watermarking is based on the 2D Discrete Cosine Transform and Elgamal cryptosystem. The 2D Discrete Cosine Transform depends on the matrix products, while the Elgamal cryptosystem depends on the discrete logarithm problem. The cryptosystem is combined with existing Arnold transform in watermarking algorithm to enhance the security of secret image. Value of Peak Signal to Noise Ratio was taken as performance evaluation parameters. On the whole, the performance evaluation shows that combining the two algorithms improved the performance of image watermarking.
    Matched MeSH terms: Communication
  19. Fulltext LoRa Communications as an Enabler for Internet of Drones towards Large-Scale Livestock Monitoring in Rural Farms
    Behjati M, Mohd Noh AB, Alobaidy HAH, Zulkifley MA, Nordin R, Abdullah NF
    Sensors (Basel), 2021 Jul 26;21(15).
    PMID: 34372281 DOI: 10.3390/s21155044
    Currently, smart farming is considered an effective solution to enhance the productivity of farms; thereby, it has recently received broad interest from service providers to offer a wide range of applications, from pest identification to asset monitoring. Although the emergence of digital technologies, such as the Internet of Things (IoT) and low-power wide-area networks (LPWANs), has led to significant advances in the smart farming industry, farming operations still need more efficient solutions. On the other hand, the utilization of unmanned aerial vehicles (UAVs), also known as drones, is growing rapidly across many civil application domains. This paper aims to develop a farm monitoring system that incorporates UAV, LPWAN, and IoT technologies to transform the current farm management approach and aid farmers in obtaining actionable data from their farm operations. In this regard, an IoT-based water quality monitoring system was developed because water is an essential aspect in livestock development. Then, based on the Long-Range Wide-Area Network (LoRaWAN®) technology, a multi-channel LoRaWAN® gateway was developed and integrated into a vertical takeoff and landing drone to convey collected data from the sensors to the cloud for further analysis. In addition, to develop LoRaWAN®-based aerial communication, a series of measurements and simulations were performed under different configurations and scenarios. Finally, to enhance the efficiency of aerial-based data collection, the UAV path planning was optimized. Measurement results showed that the maximum achievable LoRa coverage when operating on-air via the drone is about 10 km, and the Longley-Rice irregular terrain model provides the most suitable path loss model for the scenario of large-scale farms, and a multi-channel gateway with a spreading factor of 12 provides the most reliable communication link at a high drone speed (up to 95 km/h). Simulation results showed that the developed system can overcome the coverage limitation of LoRaWAN® and it can establish a reliable communication link over large-scale wireless sensor networks. In addition, it was shown that by optimizing flight paths, aerial data collection could be performed in a much shorter time than industrial mission planning (up to four times in our case).
    Matched MeSH terms: Communication
  20. Fulltext Liquid-Based Reconfigurable Antenna Technology: Recent Developments, Challenges and Future
    Abu Bakar H, Abd Rahim R, Soh PJ, Akkaraekthalin P
    Sensors (Basel), 2021 Jan 26;21(3).
    PMID: 33530534 DOI: 10.3390/s21030827
    Advances in reconfigurable liquid-based reconfigurable antennas are enabling new possibilities to fulfil the requirements of more advanced wireless communication systems. In this review, a comparative analysis of various state-of-the-art concepts and techniques for designing reconfigurable antennas using liquid is presented. First, the electrical properties of different liquids at room temperature commonly used in reconfigurable antennas are identified. This is followed by a discussion of various liquid actuation techniques in enabling high frequency reconfigurability. Next, the liquid-based reconfigurable antennas in literature used to achieve the different types of reconfiguration will be critically reviewed. These include frequency-, polarization-, radiation pattern-, and compound reconfigurability. The current concepts of liquid-based reconfigurable antennas can be classified broadly into three basic approaches: altering the physical (and electrical) dimensions of antennas using liquid; applying liquid-based sections as reactive loads; implementation of liquids as dielectric resonators. Each concept and their design approaches will be examined, outlining their benefits, limitations, and possible future improvements.
    Matched MeSH terms: Communication
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