Journal articles: 'Marine communications'

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Day, Andrew, Dan Laffoley, John Davis, Andy Jeffrey, Olivier Musard, and Charlotte Vick. "Innovation in communications about marine protection." Aquatic Conservation: Marine and Freshwater Ecosystems 24, S2 (November 2014): 216–37. http://dx.doi.org/10.1002/aqc.2509.

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Chen, Hu. "Secure, Robust and Adaptive Echo-Based Information Hiding in Voice Communications for Equipment Maintenance in Marine Ships." Advanced Materials Research 490-495 (March 2012): 2738–42. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2738.

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The maintenance of equipments in marine ships is a critical issue, in which the security of robustness of the communications between the marine ships and the base present foremost importance. As the communication link confronts bandwidth and delay constraints, it is challengeable to design an appropriate scheme. In this paper, we propose an echo-based information hiding scheme for addressing this problem. The confidentiality and integrity of the maintenance communications can be guaranteed. The robustness of the communication indicates the resilience to artificial tampering. The interaction for maintenance guidance can provide associated text or images via voice communications. Our echo-based method utilizes the sound echo delay to hide the information in the voices. The simulation verified that the scheme is secure and robust.

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Chitre, Mandar, Shiraz Shahabudeen, and Milica Stojanovic. "Underwater Acoustic Communications and Networking: Recent Advances and Future Challenges." Marine Technology Society Journal 42, no. 1 (March 1, 2008): 103–16. http://dx.doi.org/10.4031/002533208786861263.

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The past 30 years have seen a growing interest in underwater acoustic communications because of its applications in marine research, oceanography, marine commercial operations, the offshore oil industry and defense. Continued research over the years has resulted in improved performance and robustness as compared to the initial communication systems. In this paper, we aim to provide an overview of the key developments in point-to-point communication techniques as well as underwater networking protocols since the beginning of this decade. We also provide an insight into some of the open problems and challenges facing researchers in this field in the near future.

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Friderikos, V., K. Papadaki, H. Agvhami, A. Gkelias, and M. Dohler. "Linked waters [marine communication]." Communications Engineer 3, no. 2 (April 1, 2005): 24–27. http://dx.doi.org/10.1049/ce:20050204.

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Cantwell, Vincent, and Gerry E. Mille. "Risk and Hazard Communication In The Marine Oil Transportation Environment." International Oil Spill Conference Proceedings 1999, no. 1 (March 1, 1999): 1147–51. http://dx.doi.org/10.7901/2169-3358-1999-1-1147.

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ABSTRACT An important element in the prevention of marine oil spills, accidents, and injury, is the effective communication of the risks and hazards present. Risk and hazard communication is typically accomplished through the application of labels, signs, markers, graphics, color codes, and through other warning or alarm devices. The type, size, physical characteristics, content, and placement of risk and hazard communication devices is directly related to the utility, persistence, and effectiveness of the intended message. The precise selection of words, phrases, and characters directly impacts the intelligibility and comprehension of the risk or hazard being identified. Confidence and compliance levels of those to which the message is directed, are also affected by poorly designed, worded, or placed visual and audible signals. Regulations requiring or defining the content of risk communications do not adequately account for these factors. Risk and hazard communications are further complicated by cultural factors. Current trends in vessel construction and manning will only exacerbate these issues. Guidelines have been published for hazard and risk communication devices, equipment, and marine systems. This guidance should be used to evaluate and improve risk and hazard communication however possible. The goal of risk and hazard communication should be to promote or support Situation Awareness, (SA). Education should be conducted in the proper interpretation, application, and maintenance of communication devices.

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Beaujean, Pierre-Philippe J. "Recent Technological Trends in Underwater Acoustic Communications." Marine Technology Society Journal 49, no. 6 (November 1, 2015): 161–65. http://dx.doi.org/10.4031/mtsj.49.6.10.

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AbstractAs underwater acoustic communication technology is becoming more mature, it is increasingly used in the marine industry, scientific community, and military. This article enquires about the latest developments produced by academia and identifies new technological trends in this field. The latest trends in point-to-point communications, multiple-input multiple-output technology, and underwater acoustic networking are reviewed.

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Gunn, Cailene M., Alicia M. Amerson, Kelsey L. Adkisson, and Joseph H. Haxel. "A Framework for Effective Science Communication and Outreach Strategies and Dissemination of Research Findings for Marine Energy Projects." Journal of Marine Science and Engineering 10, no. 2 (January 19, 2022): 130. http://dx.doi.org/10.3390/jmse10020130.

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Marine energy is an emerging renewable energy industry with the potential to produce 2300 terawatt-hours per year from resources within the United States. As development and testing of marine energy devices advance, regulatory and permitting decision-makers are concerned about the uncertainty surrounding the potential environmental effects resulting from the introduction of these novel devices in coastal and riverine environments. The Triton Initiative researches and provides recommendations for environmental monitoring technologies and methods to inform industry stakeholders with the data necessary to permit the testing of marine energy systems. Effective dissemination of the research findings is essential for improving the accessibility of data to stakeholders who may use the results to inform policy decisions, yet few frameworks for conducting science communications for marine energy projects exist. In this paper, we present tools, channels, and tactics for developing a science communication framework for marine energy projects, or similar areas of study, using the Triton Initiative’s pilot science communication program as a case study. By leveraging existing bodies of work in disciplines such as communications theory, marketing, public relations, and social science, the presented framework includes audience identification and analysis; channel development, including a website, blog, newsletter, social media, and webinars and presentations; and metrics for determining success. Outcomes from one year of Triton’s case study are presented, including the most effective tactics and lessons learned.

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Gajewska, Małgorzata. "M2M communications system proposal for maritime applications." Zeszyty Naukowe Akademii Marynarki Wojennej, no. 4 (December 8, 2017): 1. http://dx.doi.org/10.5604/01.3001.0010.6744.

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This article describes the proposal to use the M2M communication to enhance the safety of people, ships and other marine infrastructure, in broadly defined marine systems. In addition, there are numerous examples of planned solutions to be implemented in the near future as well as new services. The proposal for M2M communication system architecture is described below. In addition, the use of the STRUGA system radio interface as the M2M communication interface is proposed.

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Yuan-Ming, Ding, and Zhang Fang. "Dynamic Bandwidth Allocation Strategy for Marine VHF Communications." Information Technology Journal 12, no. 21 (October 15, 2013): 6253–57. http://dx.doi.org/10.3923/itj.2013.6253.6257.

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Liu, Gui, Yong Mei Pan, and Xiu Yin Zhang. "Compact Filtering Patch Antenna Arrays for Marine Communications." IEEE Transactions on Vehicular Technology 69, no. 10 (October 2020): 11408–18. http://dx.doi.org/10.1109/tvt.2020.3010531.

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VICHEVA, PETINA. "ON SOME ISSUES IN MARITIME RADIOCOMMUNICATIONS." Journal of Bulgarian Language 69, no. 2 (June 30, 2022): 62–73. http://dx.doi.org/10.47810/bl.69.22.02.06.

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The paper presents some issues arising during communication between vessels at sea and the Vessel Traffic Service (VTS). The International Maritime Organization developed the Standard Marine Communication Phrases (SMCP) in 2001. The SMCP are aimed at imposing certain requirements and serve as a VTS communication protocol. There is, however, disagreement between the protocol and its application in real-life radiocommunications at sea. The study deals with this discrepancy and describes situations where it leads to miscommunication. The conclusions presented in the paper can contribute towards the improvement of the SMCP application, thus facilitating radio-communications at sea. Keywords: Maritime English; Standard Marine Communication Phrases (SMCP); Vessel Traffic Service (VTS); frame of interpretation

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Bocanegra Valle, Ana. "The Language of Seafaring: Standardized Conventions and Discursive Features in Speech Communications." International Journal of English Studies 11, no. 1 (June 1, 2011): 35. http://dx.doi.org/10.6018/ijes/2011/1/137091.

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This paper portrays how English language is constructed and displayed by shipboard crews and shore-based personnel when communicating through radiotelephony. Based on internationally-recognized recommendations for implementation when ships communicate with each other or with shore-based stations as well as on examples of current practice contained in marine communication manuals, this paper explores the message patterns, the standardized conventions, and the general and discursive practices governing speech communications at sea. Firstly, marine communications are defined and the role of Maritime English in the shipping industry for ensuring a safe and efficient passage discussed. Then, the standardized language of the sea is explained. Next, a move-step model to the analysis of the stages making up communicative exchanges at sea is applied and the main general and discursive features that prevail in such exchanges described. Finally, two examples help to illustrate the model and features presented and discussed.

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Patel, Jay, and Mae Seto. "CDMA-based multi-domain communications network for marine robots." Journal of the Acoustical Society of America 148, no. 4 (October 2020): 2510. http://dx.doi.org/10.1121/1.5146976.

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Son, Jaekwang, Seong Ro Lee, and Jaewoo So. "Performance Evaluation of a HARQ-ARQ Interaction Scheme for Reliable Communications in Marine Communication Networks." Journal of Korea Information and Communications Society 39C, no. 11 (November 28, 2014): 1201–8. http://dx.doi.org/10.7840/kics.2014.39c.11.1201.

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Novkinić, Bekir, Igor Vujović, and Joško Šoda. "Marine Environment Influence on Fiber Optic Systems Operation." Transactions on Maritime Science 4, no. 1 (April 20, 2015): 23–34. http://dx.doi.org/10.7225/toms.v04.n01.003.

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Optic communications are increasingly used in many areas, including traffic and maritime nowadays. There is a lack of researches about environmental parameters impact to the operation of fibers in traffic systems, i.e. ships, cars, aircraft or port logistics. This paper investigates environmental influence on three-layer fiber optic system. The two-layer optic system is also analyzed for the comparison purposes. Several environmental factors were simulated, including temperature, pressure, and humidity for all three IR windows. In the three layer optic system, the environmental influence is brought through the air’s refractivity index. The final goal is to determine if the change of the environmental factor(s) can change or lose some of the modes used for communication in some specific application.

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Huang, Kai, Zhen Guo, Jun Ye, and Yihang Peng. "A Method for Extracting Fingerprint Feature of Communication Satellite Signal." Wireless Communications and Mobile Computing 2022 (August 2, 2022): 1–10. http://dx.doi.org/10.1155/2022/7796017.

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Satellite communications have historically played a vital role in a variety of industries, including maritime communications. The marine communication environment is exceedingly complicated, and extracting the characteristics of communication equipment signals is difficult. This research proposes a method for extracting satellite signal fingerprint characteristics based on the maritime complex communication environment. To create the signal fingerprint feature vector, the marginal spectral entropy is determined using the HHT (Hilbert-Huang transform) time-frequency analysis approach. Furthermore, by merging the Mahalanobis distance approach with the EEMD (ensemble empirical mode decomposition) algorithm, this study enhances it. The improved EEMD algorithm decomposes the original signal using EEMD, calculates the Mahalanobis distance between each IMF (intrinsic mode function) component and the raw data, optimizes the adaptive threshold using MPA (marine predators algorithm), and then analyzes the IMF components and redundant IMF components. It was decided to eliminate superfluous IMF components. Finally, this article mimics the Iridium satellite signal. The results of the experiments suggest that using this strategy minimizes the computational cost of the next step in fingerprint feature extraction while ensuring the accuracy of signal fingerprint feature recognition.

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Wiener, Carlie S., Malia A. J. Rivera, Robert J. Toonen, Jo-Ann C. Leong, Randall K. Kosaki, Stephen Karl, Kaylene Keller, and Hoku Johnson. "Creating Effective Partnerships in Ecosystem-Based Management: A Culture of Science and Management." Journal of Marine Biology 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/241610.

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An ecosystem-based management research partnership between the Hawai‘i Institute of Marine Biology and Office of National Marine Sanctuaries, specifically with the Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve and, later, the Papahānaumokuākea Marine National Monument, provides a case study to analyze integration of scientific research into management plans through collaborative communications. Ecosystem-based management seeks input from disparate stakeholders and requires effective communication systems for the public, science, and management partners that bypass differences in organizational culture and communication styles. Here, we examine a successful partnership within the framework of ecosystem-based management to survey and evaluate cultural differences, understand what facilitates collaborative communication, highlight factors that impede a successful partnership, and identify areas for improvement. Effective communication has been achieved through an analysis of the organizations cultures and structures to better define communication links. Although specific differences were noted in organization and style, successful integration was accomplished through techniques such as the development of symposia and semiannual reports. This paper will explore the organizational culture analysis and structure evaluation, which are components of a larger study. This science management integration project is an example of how organizational analysis can lead to recommendations for improved communication and integration of science and management.

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Jeon, Ki Jun, Byung Hoon Ko, Se-Chang Myung, Seong Ro Lee, and Kwang Soon Kim. "Protograph-Based Block LDPC Code Design for Marine Satellite Communications." Journal of Korea Information and Communications Society 39C, no. 7 (July 31, 2014): 515–20. http://dx.doi.org/10.7840/kics.2014.39c.7.515.

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WEN, Wenkun, Youmin ZHU, Chengwen XING, Tingting YANG, Minghua XIA, and Erhu CHEN. "The state of the art and challenges of marine communications." SCIENTIA SINICA Informationis 47, no. 6 (June 1, 2017): 677. http://dx.doi.org/10.1360/n112017-00016.

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Hong, Le, Weicheng Cui, and Hao Chen. "A Novel Multi-Robot Task Allocation Model in Marine Plastics Cleaning Based on Replicator Dynamics." Journal of Marine Science and Engineering 9, no. 8 (August 14, 2021): 879. http://dx.doi.org/10.3390/jmse9080879.

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As marine plastic pollution threatens the marine ecosystem seriously, the government needs to find an effective way to clean marine plastics. Due to the advantages of easy operation and high efficiency, autonomous underwater vehicles (AUVs) have been applied to clean marine plastics. As for the large-scale marine environment, the marine plastic cleaning task needs to be accomplished through the collaborative work of multiple AUVs. Assigning the cleaning task to each AUV reasonably and effectively has an essential impact on improving cleaning efficiency. The coordination of AUVs is subjected to harsh communication conditions. Therefore, to release the dependence on the underwater communications among AUVs, proposing a reliable multi-robot task allocation (MRTA) model is necessary. Inspired by the evolutionary game theory, this paper proposes a novel multi-robot task allocation (MRTA) model based on replicator dynamics for marine plastic cleaning. This novel model not only satisfies the minimization of the cost function, but also reaches a relatively stable state of the task allocation. A novel optimization algorithm, equilibrium optimizer (EO), is adopted as the optimizer. The simulation results validate the correctness of the results achieved by EO and the applicability of the proposed model. At last, several valuable conclusions are obtained from the simulations on the three different assumed AUVs.

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Lee, Jeongho, and Dongsan Jun. "Development Design of Wrist-Mounted Dive Computer for Marine Leisure Activities." Electronics 9, no. 5 (April 28, 2020): 727. http://dx.doi.org/10.3390/electronics9050727.

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Divers conventionally use underwater notepad or flash to communicate each other in the water. For safe marine leisure activities, touchscreen based intuitive means of communications such as drawing and writing are needed to be integrated into the conventional dive computers. In this paper, we propose a wrist-mounted dive computer, so called DiverPAD, for underwater drawing and writing. For the framework design of proposed DiverPAD, firmware, communication protocol, user interface (UI), and underwater touchscreen functions are designed and integrated on DiverPAD. As a key feature, we deployed an electrical insulator based capacitive touchscreen which enables divers to perform underwater drawing and writing for clear and immediate information delivery in the water.

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Campo-Valera, María, and Ivan Felis. "Underwater Acoustic Communication for The Marine Environment’s Monitoring." Proceedings 42, no. 1 (November 14, 2019): 51. http://dx.doi.org/10.3390/ecsa-6-06642.

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Within the possibilities of non-linear acoustics, the parametric effect offers a range of acoustic applications that are currently being exploited in different areas. In underwater acoustics, environmental monitoring and security are one of the applications that can benefit from these technologies, allowing the transmission of information in a directivity controlled and efficient manner. An essential aspect for the optimal functioning of these technologies is the choice of the modulation that best suits the needs of communication. In the present work, different modulation techniques are explained, through their non-linear propagation, that allows generating the signals to be propagated. Among the modulations presented in this work, we have Amplitude Modulation (AM), Continuous Phase Frequency Shift Keying (CPFSK), and Linear Frequency Modulation (LFM) modulations normally used in communications. These modulations are performed with a modulating signal (sine and sine-sweeps type) whose non-linear demodulation determines the shape of the 1 and 0 bits, through the transmission of a bit string. With all this, comparisons are made between each technique, to obtain a more precise detection and discrimination of the bits.

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Timmins, I. J., and Siu O'Young. "Marine Communications Channel Modeling Using the Finite-Difference Time Domain Method." IEEE Transactions on Vehicular Technology 58, no. 6 (July 2009): 2626–37. http://dx.doi.org/10.1109/tvt.2008.2010326.

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Vitousek, Maren N., James S. Adelman, Nathan C. Gregory, and James J. H. St Clair. "Heterospecific alarm call recognition in a non-vocal reptile." Biology Letters 3, no. 6 (October 2, 2007): 632–34. http://dx.doi.org/10.1098/rsbl.2007.0443.

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The ability to recognize and respond to the alarm calls of heterospecifics has previously been described only in species with vocal communication. Here we provide evidence that a non-vocal reptile, the Galápagos marine iguana ( Amblyrhynchus cristatus ), can eavesdrop on the alarm call of the Galápagos mockingbird ( Nesomimus parvulus ) and respond with anti-predator behaviour. Eavesdropping on complex heterospecific communications demonstrates a remarkable degree of auditory discrimination in a non-vocal species.

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Dai, Minghui, Yang Li, Peichun Li, Yuan Wu, Liping Qian, Bin Lin, and Zhou Su. "A Survey on Integrated Sensing, Communication, and Computing Networks for Smart Oceans." Journal of Sensor and Actuator Networks 11, no. 4 (October 26, 2022): 70. http://dx.doi.org/10.3390/jsan11040070.

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The smart ocean has been regarded as an integrated sensing, communication, and computing ecosystem developed for connecting marine objects in surface and underwater environments. The development of the smart ocean is expected to support a variety of marine applications and services such as resource exploration, marine disaster rescuing, and environment monitoring. However, the complex and dynamic marine environments and the limited network resources raise new challenges in marine communication and computing, especially for these computing-intensive and delay-sensitive tasks. Recently, the space–air–ground–sea integrated networks have been envisioned as a promising network framework to enhance the communication and computing performance. In this paper, we conduct a comprehensive survey on the integrated sensing, communication, and computing networks (ISCCNs) for smart oceans based on the collaboration of space–air–ground–sea networks from four domains (i.e., space layer, aerial layer, sea surface layer, and underwater layer), and five aspects (i.e., sensing-related, communication-related, computation-related, security-related, and application-related). Specifically, we provide the key technologies for the ISCCNs in smart oceans, and introduce the state-of-the-art marine sensing, communication, and computing paradigms. The emerging challenges with the potential solutions of the ISCCNs for smart oceans are illustrated to enable the intelligent services. Moreover, the new applications for the ISCCNs in smart oceans are discussed, and potential research directions in smart oceans are provided for future works.

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Shengde, Hu, and Li Zhonghua. "Performance Analysis of Marine Ecological Environment Governance Based on DPSIR and Entropy Weight TOPSIS Model." Mobile Information Systems 2022 (August 25, 2022): 1–10. http://dx.doi.org/10.1155/2022/9224879.

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In order to solve the global marine ecological environment problems and ensure their own marine strategic interests, we should participate in the global marine ecological environment governance in an all-round way. There are still some problems in the evaluation system, supervision mechanism, and performance evaluation of the marine ecological environment. Considering the impact and analysis on the ecological environment in the effect of marine governance, this paper puts forward the performance analysis of marine ecological environment governance based on DPSIR (Drive Pressure State Impact Response) and entropy weight TOPSIS model and constructs the performance index evaluation system of marine ecological environment governance combined with the current situation of marine ecological environment governance. Using entropy TOPSIS (technique for order performance by similarity to ideal solution) model and geographic detector, this paper explores the influencing factors of governance performance. From the perspective of marine ecological environment governance effect, the governance effect is good. The influence of pressure factors such as ecological environment, population, and economy is generally large. The main causes of marine environmental pressure are the massive amount of industrial wastewater, the utilization of water resources in coastal areas, and the employees involved in the sea. Through the factor detection method of geographic detector, the strength calculation of the three criteria of pressure-state-response which affect the performance level of marine environmental governance is carried out, and the pressure layer index, state layer index, and response layer index have good response. In marine science and technology innovation ability, government investment in marine construction has a significant impact on environmental governance performance.

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Niu, Ming Hui, and Joung Hyung Cho. "Ocean Modeling Analysis and Modeling Based on Deep Learning." Mobile Information Systems 2022 (July 30, 2022): 1–6. http://dx.doi.org/10.1155/2022/1019564.

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The ocean comprises an uninterrupted body of salt water confined within a vast basin on the earth’s surface. The ocean is the largest ecosystem on earth with rich and diverse biological resources. Organisms that reside in salty water are referred to as “marine life.” Plants, animals, and microorganisms including archaea and bacteria are examples of these. The existence of marine life is not only a biological resource but also an economic source. Toys and other industries that imitate marine life have emerged in the market. A different modeling design of marine life has improved with the passage of time and the concept of modeling aesthetics has been incorporated. The identification of marine life images is challenging due to the complexity of the maritime environment, and there are several flaws in marine life models. The rise of deep learning has brought some new ideas for the weaknesses in marine life modeling, and the advantages of convolutional neural networks have contributed to some of the concepts based on deep learning. This research analyses marine modeling by using the benefits of convolutional neural networks, so that people can better understand marine life modeling. The experimental results indicate that the proposed approach has achieved good results in marine life detection, and the modeling effect of ocean modeling analysis based on deep learning is good.

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Moon, J. N. J., and D. S. Tudhope. "An Agent-Directed Marine Navigation Simulator." Journal of Navigation 59, no. 3 (August 23, 2006): 461–75. http://dx.doi.org/10.1017/s0373463306003869.

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The instructor of a full mission marine simulator faces a daunting task, controlling several target ships under varying environmental conditions while responding to a variety of communications. This project applies computer agent technology to an instructor station. Each target ship is controlled by a collision avoidance agent which takes command of the ship and a track-keeping agent which acts as an assistant, sending the collision avoidance agent advisory messages. Experiments have been performed for a number of collision situations in varying environmental conditions. An analysis of the results demonstrates the potential of such a system for producing realistic target ship motion, including track-keeping and some collision avoidance manoeuvres, thus reducing the instructor’s immediate load.

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Solcanu, Vasile, Marian Gaiceanu, and Georgiana Rosu. "Study of Resistance to Disturbances of the Main Types of Communication Systems on Board Military Ships Used during Interception or Search and Rescue Missions." Inventions 6, no. 4 (October 27, 2021): 72. http://dx.doi.org/10.3390/inventions6040072.

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In addition to combat missions, military ships often participate in search-and-rescue missions or interception of ships with refugees or migrants. The communication systems and modes of work that may be used during these missions will be in accordance with the International Convention for the Safety of Life at Sea (SOLAS). This paper aims to demonstrate by theoretical methods (analytical and numerical) the noise stability of communication systems using analog modulation in high-noise conditions, characteristic of the marine environment. The stability of analog systems employing amplitude (AM), frequency (FM), and phase (PM) modulations is investigated. The analyzed systems are currently under use in distress maritime communications.

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Duan, Jian-Li, Bin Lin, Lin X. Cai, Yu-Xiang Liu, and Yuan Wu. "Node Deployment of Marine Monitoring Networks: A Multiobjective Optimization Scheme." Sensors 20, no. 16 (August 11, 2020): 4480. http://dx.doi.org/10.3390/s20164480.

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The increasing demands for real-time marine monitoring call for the wide deployment of Marine Monitoring Networks (MMNs). The low-rate underwater communications over a long distance, long propagation delay of underwater acoustic channel, and high deployment costs of marine sensors in a large-scale three-dimensional space bring great challenges in the network deployment and management of MMN. In this paper, we first propose a multitier, hierarchical network architecture of MMN with the support of edge computing (HMMN-EC) to enable efficient monitoring services in a harsh marine environment, taking into consideration the salient features of marine communications. Specifically, HMMN-EC is composed of three subnetworks, i.e., underwater acoustic subnetwork, the sea-surface wireless subnetwork, and the air wireless subnetwork, with a diversity of network nodes with different capabilities. We then jointly investigate the deployment diverse network nodes with various constraints in different subnetworks of HMMN-EC. To this end, we formulate a Multiobjective Optimization (MO) problem to minimize the network deployment cost while achieving the maximal network lifetime, subject to the limited energy of different marine nodes and the complex deployment environment. To solve the formulated problem, we present an Ant-Colony-based Efficient Topology Optimization (AC-ETO) algorithm to find the optimal locations of nodes in different subnetworks of MMN in a large-scale deployment. The time complexity of the proposed algorithm is also analyzed. Finally, extensive simulations are carried out to validate the superior performance of the proposed algorithm compared with some existing solutions.

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Li, Changzhen, Junyi Yu, Jie Xue, Wei Chen, Shoufeng Wang, and Kun Yang. "Maritime Broadband Communication: Wireless Channel Measurement and Characteristic Analysis for Offshore Waters." Journal of Marine Science and Engineering 9, no. 7 (July 20, 2021): 783. http://dx.doi.org/10.3390/jmse9070783.

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For a long time, the development of maritime communication has been restricted by the low data rate, high-latency and high cost of the current communication systems. The upgrade of new generation mobile communication technologies is attracting more and more attention to conduct a shore-based broadband mobile communication network with high-latency and high reliability to serve the maritime industries. This paper presents a solution by means of building a ship-to-infrastructure (S2I) and a ship-to-ship (S2S) wireless communication networks for an offshore region. We characterize the S2I and S2S channels at 5.9 GHz band based on the channel measurements in realistic environments. The channel characteristics, including power delay profile, delay spread, propagation path loss, are extracted and analyzed. In view of the difference between marine and terrestrial communications, we analyze the influencing factors of the offshore water, including effective reflection, divergence and shadowing from the water surface, and diffraction loss caused by the earth curvature. We also predict the power coverage range and the channel capacity for S2I and S2S wireless communications. Finally, the communication performance is evaluated according to the channel measurement and characterization analysis. The research results can be a reference for the construction of maritime communication networks.

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Xu, Lijuan, and Lihong Zhang. "Construction of the Rule of Law System of Marine Ecological Environment Protection under the Background of Wireless Network Information Fusion." Wireless Communications and Mobile Computing 2021 (October 15, 2021): 1–12. http://dx.doi.org/10.1155/2021/1611707.

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With the rapid development of my country’s marine economy, human society is demanding more and more marine resources and space, resulting in serious damage to the marine ecological environment. In order to protect the marine ecology and improve the sustainable development of marine resources, this paper studies the legal system of marine ecological environmental protection based on the background of wireless network information fusion. By studying the status quo of several well-known marine ports and ecological environment in China, building a wireless network information fusion platform, integrating wireless network information into marine ecological surveys, collecting data through WSN nodes, and comparing wireless network information fusion with traditional methods, the efficiency of marine ecological environmental protection and the identification of marine pollution methods in different periods of time coordinate the rapid economic development and build a sustainable marine ecology. The results of the study found that the monitoring efficiency based on wireless network information fusion is more than 25% higher than the traditional monitoring method, and the recognition efficiency after 3 months is still more than 20% higher than the traditional method. This shows that information fusion in wireless networks can play a key role in the construction of a legal system for marine ecological and environmental protection.

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Day, A. M., S. M. Turner, and D. B. Arnold. "Improved Visualisation of Marine Data: Algae and Acid Rain." Computer Graphics Forum 13, no. 3 (August 1994): 361–70. http://dx.doi.org/10.1111/1467-8659.1330361.

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Ogawa, Tomohisa, Mizuki Watanabe, Takako Naganuma, and Koji Muramoto. "Diversified Carbohydrate-Binding Lectins from Marine Resources." Journal of Amino Acids 2011 (November 15, 2011): 1–20. http://dx.doi.org/10.4061/2011/838914.

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Marine bioresources produce a great variety of specific and potent bioactive molecules including natural organic compounds such as fatty acids, polysaccharides, polyether, peptides, proteins, and enzymes. Lectins are also one of the promising candidates for useful therapeutic agents because they can recognize the specific carbohydrate structures such as proteoglycans, glycoproteins, and glycolipids, resulting in the regulation of various cells via glycoconjugates and their physiological and pathological phenomenon through the host-pathogen interactions and cell-cell communications. Here, we review the multiple lectins from marine resources including fishes and sea invertebrate in terms of their structure-activity relationships and molecular evolution. Especially, we focus on the unique structural properties and molecular evolution of C-type lectins, galectin, F-type lectin, and rhamnose-binding lectin families.

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Yang, Kyeong pil, SEUNGHWAN KIM, Wan-Jin Kim, and Seokjun Ko. "The frame synchronization robust to low signal power in underwater acoustic communications." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A281. http://dx.doi.org/10.1121/10.0011345.

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In underwater acoustic communications, it is difficult to find the starting time of received signals because of noise, multipath, transmission time delay, and Doppler frequency. In this paper, we solve the problem by using 2-STEP frame synchronization in the receiver. The transmitted signal is modulated by using burst PSK. The frame is composed of preamble of PN code and random data. The 2-STEP frame synchronization consist of non-coherent correlation, sliding FFT, and coherent correlation. First, in the STEP 1, the non-coherent correlation and sliding FFT are simultaneously performed to obtain an approximate start time of a frame in time domain and a Doppler frequency in frequency domain. However, through the results of the marine experiments, we can see that it is difficult to guarantee the starting time point in STEP 1 when the received signal power is weak and there is high Doppler frequency. Therefore, in the STEP 2, we use the coherent correlation to get more accurate start time stably after compensating the Doppler frequency of FFT in STEP 1. Finally, we can assure that the performance of the proposed 2-STEP frame synchronization is robust to low power of received signal and high Doppler frequency through marine experiments.

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Zhu, Yuehong, and Ying Han. "Marine Environment Monitoring Based on Virtual Reality and Fuzzy C-Means Clustering Algorithm." Mobile Information Systems 2021 (September 16, 2021): 1–11. http://dx.doi.org/10.1155/2021/2576919.

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In modern society, with the rapid increase of population and the serious shortage of resources, the marine environment has been destroyed; there are also many people who go out to sea without permission, regardless of the legal constraints, fishing. This kind of behavior leads the marine environment to get worse and worse, so the real-time monitoring of the marine environment is very necessary. The main article marine environment monitoring, virtual reality technology, and fuzzy C-means clustering algorithm combine to improve the efficiency of monitoring and processing power of the data information. Through the application of virtual reality technology in the marine environment monitoring base and real-time simulation of the dynamics of the ocean, the monitoring personnel can understand the emergencies on the sea in time; the fuzzy C-means clustering algorithm is applied to the server receiving the data to classify the data. It is found in the experiment that when virtual reality technology and fuzzy C-means clustering algorithm are not used, the data of marine environment monitoring takes more than 1.3 s to return to the server, but, after applying two advanced technologies, the return efficiency is greatly improved, and the time consumed is less than 0.82 s. The results show that virtual reality technology and fuzzy C-means clustering algorithm can improve the efficiency of environmental monitoring, and through virtual reality technology, real-time monitoring of the marine environment can be achieved; in the absence of people out to sea, the actual situation on the sea can be clearly understood; and fuzzy C-means clustering algorithm can improve the speed of data processing, so that the monitoring personnel can solve the problem faster.

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Lv, Zhihan, Dongliang Chen, Hailin Feng, Wei Wei, and Haibin Lv. "Artificial Intelligence in Underwater Digital Twins Sensor Networks." ACM Transactions on Sensor Networks 18, no. 3 (August 31, 2022): 1–27. http://dx.doi.org/10.1145/3519301.

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The particularity of the marine underwater environment has brought many challenges to the development of underwater sensor networks (UWSNs) . This research realized the effective monitoring of targets by UWSNs and achieved higher quality of service in various applications such as communication, monitoring, and data transmission in the marine environment. After analysis of the architecture, the marine integrated communication network system (MICN system) is constructed based on the maritime wireless Mesh network (MWMN) by combining with the UWSNs. A distributed hybrid fish swarm optimization algorithm (FSOA) based on mobility of underwater environment and artificial fish swarm (AFS) theory is proposed in response to the actual needs of UWSNs. The proposed FSOA algorithm makes full use of the perceptual communication of sensor nodes and lets the sensor nodes share the information covered by each other as much as possible, enhancing the global search ability. In addition, a reliable transmission protocol NC-HARQ is put forward based on the combination of network coding (NC) and hybrid automatic repeat request (HARQ) . In this work, three sets of experiments are performed in an area of 200 × 200 × 200 m. The simulation results show that the FSOA algorithm can fully cover the events, effectively avoid the blind movement of nodes, and ensure consistent distribution density of nodes and events. The NC-HARQ protocol proposed uses relay nodes for retransmission, and the probability of successful retransmission is much higher than that of the source node. At a distance of more than 2,000 m, the successful delivery rate of data packets is as high as 99.6%. Based on the MICN system, the intelligent ship constructed with the digital twins framework can provide effective ship operating state prediction information. In summary, this study is of great value for improving the overall performance of UWSNs and advancing the monitoring of marine data information.

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Radulescu, Raluca, Fanel-Viorel Panaitescu, Mariana Panaitescu, and Gheorghe Lazaroiu. "REAL TIME WAVE PARAMETERS MONITORING USING A FIXED COASTAL BUOY." International Journal of Modern Manufacturing Technologies 14, no. 3 (December 20, 2022): 227–32. http://dx.doi.org/10.54684/ijmmt.2022.14.3.227.

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In order to identify the marine energy potential, the marine environment will be studied through EMSO-EUXINUS network part of EMSO ERIC Pan European Research Infrastructure operated starting with 2013. The most important part of the network is monitoring stations located offshore, including wave coastal buoy in the Black Sea which record also, in real time, wave parameters starting with 2013. The main goal of the wave coastal buoy is to record, in real time, the wave data including wave high and period, direction and speed of the water, water temperature and also meteorological information (wind speed and direction and air temperature). All coastal buoy sensors are managed by a customized low power datalloger, processing and communication system integrated in a stainless-steel cabinet in AISI216L suitable for long life stay in harsh environment and salty atmosphere. The same cabinet host rechargeable battery pack and charge regulat. All the data are recorded and stored on a local data-logger and transmitted to the onshore database, at each 5 minutes via 3G communications.

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Jung, Jieun, and Seojeong Lee. "Research on Quality-in-use Measurement for Marine Software." International Journal of u- and e- Service, Science and Technology 10, no. 6 (June 30, 2017): 49–62. http://dx.doi.org/10.14257/ijunesst.2017.10.6.05.

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van Putten, Ingrid E., Stewart Frusher, Elizabeth A. Fulton, Alistair J. Hobday, Sarah M. Jennings, Sarah Metcalf, and Gretta T. Pecl. "Empirical evidence for different cognitive effects in explaining the attribution of marine range shifts to climate change." ICES Journal of Marine Science 73, no. 5 (November 23, 2015): 1306–18. http://dx.doi.org/10.1093/icesjms/fsv192.

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Abstract The changing geographical distribution of species, or range shift, is one of the better documented fingerprints of climate change in the marine environment. Range shifts may also lead to dramatic changes in the distribution of economic, social, and cultural opportunities. These challenge marine resource users' capacity to adapt to a changing climate and managers' ability to implement adaptation plans. In particular, a reluctance to attribute marine range shift to climate change can undermine the effectiveness of climate change communications and pose a potential barrier to successful adaptation. Attribution is a known powerful predictor of behavioural intention. Understanding the cognitive processes that underpin the formation of marine resource users' beliefs about the cause of observed marine range shift phenomena is therefore an important topic for research. An examination of the attribution by marine resource users of three types of range shifts experienced in a marine climate change hotspot in southeast Australia to various climate and non-climate drivers indicates the existence of at least three contributing cognitions. These are: (i) engrained mental representations of environmental phenomena, (ii) scientific complexity in the attribution pathway, and (iii) dissonance from the positive or negative nature of the impact. All three play a part in explaining the complex pattern of attribution of marine climate change range shifts, and should be considered when planning for engagement with stakeholders and managers around adaptation to climate change.

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McCallum, Marvin C., Mireille Raby, Alice M. Forsythe, Anita M. Rothblum, and Myriam W. Smith. "Communications Problems in Marine Casualties: Development and Evaluation of Investigation, Reporting, and Analysis Procedures." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 44, no. 27 (July 2000): 384–87. http://dx.doi.org/10.1177/154193120004402727.

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Molina-Molina, J. Carlos, Marouane Salhaoui, Antonio Guerrero-González, and Mounir Arioua. "Autonomous Marine Robot Based on AI Recognition for Permanent Surveillance in Marine Protected Areas." Sensors 21, no. 8 (April 10, 2021): 2664. http://dx.doi.org/10.3390/s21082664.

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The world’s oceans are one of the most valuable sources of biodiversity and resources on the planet, although there are areas where the marine ecosystem is threatened by human activities. Marine protected areas (MPAs) are distinctive spaces protected by law due to their unique characteristics, such as being the habitat of endangered marine species. Even with this protection, there are still illegal activities such as poaching or anchoring that threaten the survival of different marine species. In this context, we propose an autonomous surface vehicle (ASV) model system for the surveillance of marine areas by detecting and recognizing vessels through artificial intelligence (AI)-based image recognition services, in search of those carrying out illegal activities. Cloud and edge AI computing technologies were used for computer vision. These technologies have proven to be accurate and reliable in detecting shapes and objects for which they have been trained. Azure edge and cloud vision services offer the best option in terms of accuracy for this task. Due to the lack of 4G and 5G coverage in offshore marine environments, it is necessary to use radio links with a coastal base station to ensure communications, which may result in a high response time due to the high latency involved. The analysis of on-board images may not be sufficiently accurate; therefore, we proposed a smart algorithm for autonomy optimization by selecting the proper AI technology according to the current scenario (SAAO) capable of selecting the best AI source for the current scenario in real time, according to the required recognition accuracy or low latency. The SAAO optimizes the execution, efficiency, risk reduction, and results of each stage of the surveillance mission, taking appropriate decisions by selecting either cloud or edge vision models without human intervention.

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Whiting, Daniel. "MEXUSPAC: MEXICO/U.S. PACIFIC REGIONAL RESPONSE COORDINATION TEAM1." International Oil Spill Conference Proceedings 1995, no. 1 (February 1, 1995): 959–60. http://dx.doi.org/10.7901/2169-3358-1995-1-959.

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ABSTRACT The Agreement of Cooperation Between the United States of America and the United Mexican States Regarding Pollution of the Marine Environment by Discharges of Hydrocarbons and other Hazardous Substances, signed in Mexico City in 1980, provides a framework for cooperation in response to pollution incidents that pose a threat to the waters of both countries. Under this agreement, MEXUSPAC organizes Mexican and U.S. response agencies to plan for and respond to pollution emergencies in the marine environment. The MEXUSPAC contingency plan designates the commandant of the Mexican Second Naval Zone and the chief of the U.S. Coast Guard 11th District Marine Safety Division as the MEXUSPAC Cochairmen, and defines on-scene commanders, joint operations centers, and communications protocols that would be needed to coordinate the response to pollution incidents affecting both countries.

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Jarma, Yesid, Golnaz Karbaschi, Marcelo Dias de Amorim, Farid Benbadis, and Guillaume Chelius. "Volume-aware positioning in the context of a marine port terminal." Computer Communications 34, no. 8 (June 2011): 962–72. http://dx.doi.org/10.1016/j.comcom.2011.02.003.

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G., Thippa Reddy, Swarna Priya R.M., Parimala M., Chiranji Lal Chowdhary, Praveen Kumar Reddy M., Saqib Hakak, and Wazir Zada Khan. "A deep neural networks based model for uninterrupted marine environment monitoring." Computer Communications 157 (May 2020): 64–75. http://dx.doi.org/10.1016/j.comcom.2020.04.004.

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Li, Huanyu, Hui Li, and Youling Zhou. "Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications." Entropy 23, no. 11 (November 1, 2021): 1454. http://dx.doi.org/10.3390/e23111454.

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This paper investigates resource optimization schemes in a marine communication scenario based on non-orthogonal multiple access (NOMA). According to the offshore environment of the South China Sea, we first establish a Longley–Rice-based channel model. Then, the weighted achievable rate (WAR) is considered as the optimization objective to weigh the information rate and user fairness effectively. Our work introduces an improved joint power and user allocation scheme (RBPUA) based on a single resource block. Taking RBPUA as a basic module, we propose three joint multi-subchannel power and marine user allocation algorithms. The gradient descent algorithm (GRAD) is used as the reference standard for WAR optimization. The multi-choice knapsack algorithm combined with dynamic programming (MCKP-DP) obtains a WAR optimization result almost equal to that of GRAD. These two NOMA-based solutions are able to improve WAR performance by 7.47% compared with OMA. Due to the high computational complexity of the MCKP-DP, we further propose a DP-based fully polynomial-time approximation algorithm (DP-FPTA). The simulation results show that DP-FPTA can reduce the complexity by 84.3% while achieving an approximate optimized performance of 99.55%. This advantage of realizing the trade-off between performance optimization and complexity meets the requirements of practical low-latency systems.

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Ningrum, Dyah Ary Setya. "PENGARUH KOMUNIKASI PEMASARAN WISATA KUSUMA TIRTA MINAPOLITAN TERHADAP PENINGKATAN KUNJUNGAN WISATA BAHARI DI KABUPATEN SIDOARJO." KANAL: Jurnal Ilmu Komunikasi 4, no. 1 (December 14, 2016): 81. http://dx.doi.org/10.21070/kanal.v4i1.316.

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The purpose of this research was to determine how marketing communications affect to the increase visits in the Marine Tourism Minapolitan Kusuma Tirta Sidoarjo. The method used quantitative explanative. This study population was an overall visitor Tirta Kusuma Minapolitan consisted of 100 people. The sampling technique in this research used Taro Yamane. This study used regression analysis with simple regression methods. Primary data collection technique used Likert Scale. The results of this study can be concluded that marketing communications activities have a significant impact on tourist visits to the Tirta Kusuma Minapolitan of value R 0.572 with a percentage of 32.7%.Keywords: communications, marketing, visit

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Zou, Guo Liang, and Jie Ai Han. "The Optimal Design of ZigBee Networks Routing Algorithm for the Marine Environment." Applied Mechanics and Materials 336-338 (July 2013): 2423–27. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.2423.

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On the basis of analysis of the existing ZigBee network routing strategy, to save network energy consumption and balance the network load, the paper proposed an energy-efficient improvements and applied it in the marine environment, designed a marine monitoring the Internet of Things with ZigBee wireless monitoring network, satellite communications and remote monitoring management in the integration. The strategy improved ZBR routing algorithm based on the cluster-tree algorithm and AODVjr algorithm. The improved strategy can reduce the routing overhead while fully consider the protection of low energy nodes, effectively reduce network energy consumption, balance the network load to maximize network lifetime.

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Chou, Chien-Chang, Ren-Fu Li, Yuh-Ling Su, Chaur-Luh Tsai, and Ki-Yin Chang. "A study of the distribution of marine incidents in the harbours and waters surrounding Taiwan." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 233, no. 3 (July 30, 2018): 809–24. http://dx.doi.org/10.1177/1475090218788912.

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This research aims to discover information underlying the historical records of marine incidents in order to develop an effective marine traffic management system and rescue resource allocation system in the harbours and waters surrounding Taiwan. Data were collected from the official records of the Taiwanese Ministry of Transportation and Communications and the Coast Guard Administration of Taiwan. Data analysis and Google Earth were utilized to determine the locations of the occurred incidents. The results revealed that on an annual basis, the proportion of marine incidents outside of harbours was much higher than the incidents that took place within harbours. The results also showed that the rate of increase for marine incidents significantly decreased outside of harbours, but increased within harbours, both for commercial vessels and fishing boats from 2005 to 2009. Certain events, such as collisions/contacts, groundings/standings, mechanical malfunctions/failures, and fires/explosions accounted for more than half of the occurred accidents. Finally, the identification of incident locations provides visual evidence to elucidate precisely where the problems are and where rescue resources should be optimally allocated. Recommendations and implications for marine traffic management policy were discussed.

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Hayden, Daniel, and Benjamin Dills. "Smokey the Bear Should Come to the Beach." Social Marketing Quarterly 21, no. 1 (March 2015): 3–13. http://dx.doi.org/10.1177/1524500414558126.

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There is an open question among conservation practitioners regarding whether using flagship specifies to market marine conservation is less effective than using terrestrial species in the terrestrial context. A flagship species is a species selected to act as an ambassador, icon, or symbol for a defined habitat, issue, campaign, or environmental cause. A mascot species has many of the same attributes as a flagship species, but is selected for its communications value instead of its ecological value. Our research indicates that mascot species can be as effective a marketing tool for marine conservation as they have been for terrestrial conservation. Based on our study, there is no evidence that the use of marine mascot species or that confront threats based on fishing and harvesting of aquatic resources perform any differently from other social marketing campaigns that address terrestrial issues.

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Journal articles on the topic 'Marine communications'

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