MATEC Web of Conferences

Vehicular Ad Hoc Network (VANET) is a pillar of the envisioned Intelligent Transport System (ITS) and a subset of Mobile Ad Hoc Network that grants the communication in between the vehicles alongside with the absence of established communication infrastructure. Exposure to vulnerabilities of Vehicular Ad-Hoc Network (VANET) has been shown to be related to its nature of the environmental. For this reason, VANET security becomes a critical challenge that need to be resolved. In this paper, we assess the VANET security issues and discuss the challenges in VANET. Equally important, we comparatively review the security requirements, the type of attacks and capabilities of attackers present in VANET.

High-efficiency formation of personalized stent by additive manufacturing (3D printing) has gained deal of attention and research in interventional and personalized medicine. In this article, the structural characteristics of vascular scaffolds and the application and innovation of additive manufacturing technology in the process of angioplasty are reviewed. In the future, with the continuous maturity of additive manufacturing technology, it is expected to be an important part of interventional precision medicine to manufacture personalized vascular stent.

API 5L-X65 steel is the type of high strength low alloy (HSLA) steel, widely used in the manufacture of pipe. Submerged arc welding (SAW) is widely used for the fabrication of the pipe, the extent of use submerged arc welding caused it could be done automatically and high reliability. The results of the welding process will lead to differences and changes in the microstructure in heat affected zone (HAZ) and weld metal that will affect the mechanical properties of the output, so as to obtain good welding results required the selection of welding parameters accordingly. As the use of the heat input during welding is very important influence on the mechanical properties and microstructure of the weld. The purpose of this study to determine the effect of heat input on the microstructure, hardness and toughness of welds in submerged arc welding. Welding currents used were 200, 300, 400 and 500 Ampere with a voltage were used 25, 27 and 30 Volt. The results showed that the higher heat input will result in a growing area of HAZ region width and grain size increased. Highest hardness values are the results of the weld heat input with a low of 244.69 HVN caused by the rapid cooling rate of the weld area. The highest toughness values are the results of the highest heat input that was dominated by acicular ferrite phase.

In response to European Commission Horizon 2020’s call for ‘science-for-and-with-community’, scholars have recognized the need to conduct ‘responsible research and innovation’ and engage more with communities to combat today’s complex health challenges. Hence, higher priority has been placed to cooperate with communities in health research and innovation development to better match societal values, needs and expectations. Accordingly, the approach of community-based participatory research (CBPR), the ‘gold standard’ within the community-engaged research spectrum, is the most widely discussed. However, it is seldom achieved in reality, as it requires establishment and maintenance of open, transparent, trustful and ongoing relationships between community partners and academia to succeed. Paradoxically, despite of the significance of quality collaborative relationship to the quality and success of community-academic collaboration, the key elements to achieve it were seldom discussed.Herein, the literature review aimed to (1) discuss the previous experiences and challenges in building and sustaining community-academic collaborative relationships; (2) examine the relationship building strategies for quality collaborative relationships; and (3) identify the potential research gaps for future research.Focusing on the area of health research and innovation, peer-reviewed articles, books and grey literature related to building and sustaining relationships in community-academic collaboration published between 1998 and 2018 were identified using the Web of Science, PubMed and Google Scholar bibliographic databases and Google search engine. Literature available in full-texts and English language with a focus on relationship aspects of community-academic collaboration were examined. Previous literature suggested thatacademics and community members encountered common challenges in experiencing inequitable relationships, distrust, divide between academia and community, uncommon norms of power sharing, dissemination of results and lack of resources for maintaining long-term relationships. Two approaches of relationship building: (1) personal qualities and competence, and (2) actions for relationship building from the beginning to the end stages of collaborative relationship were discussed. Literature revealed that the ways that academics approach, collaborate, communicate with and maintain in the community had significant impact on both current and future collaborative relationships. In addition, academics differed in acceptance and readiness towards community engagement, which could be attributed to the differences in personal qualities and competence. Future research should target on identifying the factors contributing to such individual differences and compare its impact on the quality of relationship with community, so as to better cultivate individuals’ readiness and capacity towards community engagement and effective relationship building with community.

This paper presents the problem of phenomena occurring at the contact of a timing belt and a pulley. Depending on a belt size range these phenomena differ significantly. There is no indication as to what solutions are optimal for drive belts. The analysis of the coupling process and performance tests have shown that the drive belt should have a cord of very good mechanical properties and its raceway side should be made from the material of a low friction coefficient against the pulley material. A flat belt in power transmission and conveying systems cooperates with several elements consisting of timing pulleys, tensioners or guiding rails. In gear with timing belts they depend strongly on characteristics of the process as well as the type of friction. In recent constructions, producers of timing belts are very much concerned about achieving as much slippery surface as possible. The work describes the problem of friction on different surfaces as well as its influence on gear lifetime. Research results confirm that on many surfaces bigger coefficient of friction is expected.

The article is devoted to comparison of finite element marking criteria for adaptive mesh refinement while solving plane Cosserat elasticity problems. The goal is to compare the resulting adaptive meshes obtained with different marking strategies. Mesh refinement and error control is done using the functional type a posteriori error majorant. Implemented algorithms use the zero-order Raviart-Thomas approximation on triangular meshes. Four widely used marking criteria are utilized for mesh adaptation. The comparative analysis is presented for two plane-strain problems.