FSS-based triplate antenna design concept for wireless devices

2021 ◽  
pp. 1-10
Author(s):  
Ashwini Kotrashetti ◽  
B. K Lande ◽  
Ajay Poddar
Keyword(s):  
Design Methodology ◽  
Design Concept ◽  
Strong Interactions ◽  
Proof Of Concept ◽  
Wireless Devices ◽  
Multiple Frequency ◽  
Modeling And Analysis ◽  
Multiband Antennas ◽  
Mode Behavior ◽  
Radiating Element

Abstract Conventional multiband antennas suffer from strong interactions among different operating frequencies, complex configurations, low bandwidth, and reduced efficiencies. A design concept for a multibeam multiband antenna in wireless devices is proposed in this paper. The design concept provides a promising approach to augment transmission and reception. The principle of design involves a primary radiating element embedded in a triplate conformation which excites a passive array of multiple frequency secondary radiators, forming a frequency selective structure in triplate (FSST). The higher order mode behavior of the parent antenna characterizes the design of FSST placed in its nearfield. The mathematical modeling and analysis of the design methodology is also presented. As proof of concept, the proposed design methodology is validated with simulations and experiments at four unlicensed communication bands and the results are compared.

scholarly journals Understanding Screaming Channels: From a Detailed Analysis to Improved Attacks

2020 ◽  
pp. 358-401
Author(s):  
Giovanni Camurati ◽  
Aurélien Francillon ◽  
François-Xavier Standaert
Keyword(s):  
Spatial Diversity ◽  
Low Noise ◽  
Security Evaluation ◽  
The Novel ◽  
Proof Of Concept ◽  
Wireless Devices ◽  
Side Channels ◽  
Security Evaluations ◽  
The One

Recently, some wireless devices have been found vulnerable to a novel class of side-channel attacks, called Screaming Channels. These leaks might appear if the sensitive leaks from the processor are unintentionally broadcast by a radio transmitter placed on the same chip. Previous work focuses on identifying the root causes, and on mounting an attack at a distance considerably larger than the one achievable with conventional electromagnetic side channels, which was demonstrated in the low-noise environment of an anechoic chamber. However, a detailed understanding of the leak, attacks that take full advantage of the novel vector, and security evaluations in more practical scenarios are still missing. In this paper, we conduct a thorough experimental analysis of the peculiar properties of Screaming Channels. For example, we learn about the coexistence of intended and unintended data, the role of distance and other parameters on the strength of the leak, the distortion of the leakmodel, and the portability of the profiles. With such insights, we build better attacks. We profile a device connected via cable with 10000·500 traces. Then, 5 months later, we attack a different instance at 15m in an office environment. We recover the AES-128 key with 5000·1000 traces and key enumeration up to 223. Leveraging spatial diversity, we mount some attacks in the presence of obstacles. As a first example of application to a real system, we show a proof-of-concept attack against the authentication method of Google Eddystone beacons. On the one side, this work lowers the bar for more realistic attacks, highlighting the importance of the novel attack vector. On the other side, it provides a broader security evaluation of the leaks, helping the defender and radio designers to evaluate risk, and the need of countermeasures.

A Framework Supporting Life-Cycle Guidance for Fabricating Micro Components by Compression Moulding

2010 ◽  
Author(s):  
P. J. Farrugia ◽  
P. Vella ◽  
M. Mifsud
Keyword(s):  
Design Methodology ◽  
Typical Case ◽  
Economic Feasibility ◽  
Preliminary Evaluation ◽  
Proof Of Concept ◽  
Compression Moulding ◽  
Micro Manufacturing ◽  
Computer Based ◽  
Design And Manufacture ◽  
Future Work

Micro-products and components are rapidly increasing in a range of sectors. This demand requires industrial technologies capable of mass producing polymer micro products at a reasonable price. These two requirements are satisfied by the use of replication technologies such as micro compression moulding (μCM). A literature review that we conducted revealed that there is indeed little if any work explicitly related to the domain of micro compression moulding. In addition, a design methodology in micro manufacturing is still in its infancy and that there is a shortage of relevant DFX guidelines. Thus, this research aims at developing a framework for a computer-based tool whereby micro-product stakeholders are guided to select the correct mould features, material, machine and process parameters for fabricating components via micro compression moulding. The paper presents a framework developed to meet this goal. A proof-of-concept tool has also been implemented based on this framework. This tool was evaluated by typical case studies and also presented to a number of experts in the field. Preliminary evaluation results provide a degree of evidence that technology based on the framework contributes a step towards providing guidance for the design and manufacture of mould tools for fabricating μ-components by compression moulding. Another contribution of this paper is the preliminary fabrication platform using μCM. Future work is however required mainly to assess the economic feasibility of the fabrication platform, to address the limitations of the implemented tool, and to assess its effectiveness in practice.

Design of an Onboard Directional Anemometer for Bicycles

2020 ◽  
Author(s):  
Valentina Hurtado ◽  
Santiago Arango ◽  
Luis Muñoz ◽  
Omar López
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Velocity ◽  
Design Process ◽  
Design Methodology ◽  
Structural Integrity ◽  
Pitot Tube ◽  
Proof Of Concept ◽  
Large Influence ◽  
Main Component

Abstract Wind speed has large influence on the results of road tests applied to bicycles. For this reason, this paper presents the design process of an onboard anemometer dedicated to bicycle testing. The design provides an affordable way to quantify both magnitude and direction of the wind velocity relative to the bicycle, allowing recording on arbitrary wind conditions that could arise during a test. The design methodology was structured with two major phases. The first was centered on the proof-of-concept for the use of a multi-hole pitot tube as main component for the onboard anemometer. The second was focused on the design of the structure, considering both packaging and structural integrity. The prototype of anemometer was tested in a wind tunnel to verify its performance, and it was also tested under severe vibrations to verify its structural integrity. The results showed that this concept can be used as a part of the bicycle instrumentation for road tests.

A novel active balance assistive control strategy based on virtual stiffness model of XCoM

2019 ◽  
Vol 40 (1) ◽  
pp. 132-142
Author(s):  
Wei Guo ◽  
Shiyin Qiu ◽  
Fusheng Zha ◽  
Jing Deng ◽  
Xin Wang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Design Methodology ◽  
Sagittal Plane ◽  
Center Of Mass ◽  
Proof Of Concept ◽  
Disturbing Force ◽  
Content Type ◽  
Exoskeleton Robot ◽  
Stiffness Model ◽  
Virtual Stiffness

PurposeThis paper aims to propose a novel balance-assistive control strategy for hip exoskeleton robot.Design/methodology/approachA hierarchical balance assistive controller based on the virtual stiffness model of extrapolated center of mass (XCoM) is proposed and tested by exoskeleton balance assistive control experiments.FindingsExperiment results show that the proposed controller can accelerate the swing foot chasing XCoM and enlarge the margin of stability.Originality/valueAs a proof of concept, this paper shows the potential for exoskeleton to actively assist human regain balance in sagittal plane when human suffers from a forward or backward disturbing force.

Design concept of multiband antennas under the influence of the human body

2008 ◽  
Vol 51 (2) ◽  
pp. 513-515
Author(s):  
Byungwoon Jung ◽  
Hyunkyu Lee ◽  
Joonho Byun ◽  
Chang Won Jung ◽  
Myun-Joo Park ◽  
...  
Keyword(s):  
Human Body ◽  
Design Concept ◽  
Multiband Antennas

Integrating AR services for the masses: geotagged POI transformation platform

2016 ◽  
Vol 7 (3) ◽  
pp. 254-265 ◽  
Author(s):  
Jakub Trojan
Keyword(s):  
Augmented Reality ◽  
Design Methodology ◽  
Location Based Services ◽  
Proof Of Concept ◽  
Content Type ◽  
The Subject ◽  
The Creation ◽  
The Masses ◽  
Practical Implications ◽  
Tourist Information

Purpose The purpose of this paper is to propose the platform for effective transformation of points of interests (POIs) into augmented reality (AR), specifically into the three major software tools – Junaio, Layar and Wikitude. The objective is to facilitate the creation of POIs for common users of these programs and, thus, encourage the general public to participate in the formation of a new concept of applications using AR and location-based services. Design/methodology/approach The subject of this study was analysis of methods used for POI dynamisation under the context of location-based services. This paper suggests methodology based on database format transformation. It is focused on the creation of platform for automated geotagged POI transformation into AR. Findings The research results in prototype of online platform which is capable to automatically transform geotagged POI to three major AR applications. It discusses also the model implementation of this platform in Czech national tourist authority. Research limitations/implications The paper presents a proof-of-concept of dynamisation and transformation of an unspecified number of POIs stored in a simple table database and their transformation into the AR. Practical implications Services of AR are brought for the masses to effectively dynamise tourist information. Social implications Results could make the process of multimedialising data (POIs) more suitable for masses. Originality/value This paper presents a proof-of-concept of dynamisation and transformation of an unspecified number of POIs stored in a simple table database and their transfer into the three major AR applications.

The Kinematics of Eight-Speed Planetary Gear Hubs for Bicycles

2012 ◽  
Vol 232 ◽  
pp. 955-960 ◽  
Author(s):  
Long Chang Hsieh ◽  
Hsiu Chen Tang
Keyword(s):  
Design Methodology ◽  
Planetary Gear ◽  
Design Concept ◽  
Gear Train ◽  
Transmission Systems ◽  
Planetary Gear Train ◽  
Kinematic Design ◽  
Planetary Gear Trains ◽  
Gear Trains ◽  
Internal Gear

Recently, bicycles are used as exercising machines and traffic vehicles. Planetary gear trains can be used as the transmission systems with multi-speed for bicycles. The purpose of this work is to propose a design methodology for the design of eight-speed internal gear hubs with planetary gear trains for bicycles. First, we propose a design concept for the design of eight-speed planetary gear hub. Then, based on this design concept and train value equation of planetary gear train, the kinematic design of eight-speed planetary gear hub is accomplished. One eight-speed planetary gear hub is synthesized to illustrate the design methodology. Based on the proposed design methodology, many eight-speed internal gear hubs with planetary gear trains can be synthesized.

RuleML‐based learning object interoperability on the Semantic Web

2008 ◽  
Vol 5 (1) ◽  
pp. 39-58 ◽  
Author(s):  
Yevgen Biletskiy ◽  
Harold Boley ◽  
Girish R. Ranganathan ◽  
Harold Boley
Keyword(s):  
Semantic Web ◽  
Design Methodology ◽  
Learning Objects ◽  
Rule Base ◽  
Markup Language ◽  
Proof Of Concept ◽  
Content Type ◽  
Heterogeneous Learning ◽  
Rule Set ◽  
Practical Implications

PurposeThe present paper aims to describe an approach for building the Semantic Web rules for interoperation between heterogeneous learning objects, namely course outlines from different universities, and one of the rule uses: identifying (in)compatibilities between course descriptions.Design/methodology/approachAs proof of concept, a rule set is implemented using the rule markup language (RuleML), a member of XML‐based languages. This representation in RuleML allows the rule base to be platform‐independent, flexibly extensible and executable.FindingsThe RuleML source representation is easily converted to other XML‐based languages (such as RDF, OWL and XMI) as well as incorporated into, and extracted from, existing XML‐based repositories (such as IEEE LOM and CanLOM) using XSL Transformations (XSLT).Practical implicationsThe RuleML facts and rules represented in the positional slotted language are used by the OO jDREW reasoning engine to detect and map between semantically equivalent components of course outlines as the key step in their interoperation. In particular, this will enable the precise delivery of learning objects (e.g. course outlines) from repositories to a specific learner's context.Originality/valueAlthough the particular scenario is discussed in the present paper, the proposed approach can be applied to other tasks related to enabling semantic interoperability.

Towards interoperable recordkeeping systems

2017 ◽  
Vol 27 (2) ◽  
pp. 125-148 ◽  
Author(s):  
Gregory Rolan
Keyword(s):  
Design Methodology ◽  
Conceptual Models ◽  
Design Science ◽  
Proof Of Concept ◽  
Content Type ◽  
Meta Model ◽  
Concept System ◽  
Reflective Design ◽  
Practical Implications ◽  
Model Approach

Purpose The purpose of this paper is to introduce an infrastructural approach to metadata modelling and a generalised meta-model for recordkeeping metadata. This meta-model is an attempt to support interoperability between disparate systems, and particularly, between sets of ostensibly incommensurate record documentation. Design/methodology/approach The investigation used a reflective design-science investigation comprising interviews adaptive literature review, creation of conceptual models and the design and instantiation of a proof-of-concept system. Findings The investigation confirms that recordkeeping interoperability between disparate ontologies is achievable through a meta-model approach. In particular, the meta-model carefully defines relationships between entities with specific semantics that enable the development of interoperable domain schemas. Practical implications A meta-model for recordkeeping metadata facilitates the development of recordkeeping systems that possess interoperability-by-design. Social implications Recordkeeping systems that conform to the meta-model can, therefore, transcend the immediate transactional context and support participatory recordkeeping in terms of a plurality of stakeholder world views and agency in records. Originality/value This paper is one of the few reporting design-science approaches to recordkeeping informatics and one that has used a meta-model approach for recordkeeping metadata design. In contrast to most empirically determined metadata schemas, the top-down design approach has produced a schema from a wide variety of ontological sources.

Blockchain for business

2019 ◽  
Vol 20 (1) ◽  
pp. 17-21 ◽  
Author(s):  
Rohith P. George ◽  
Brad L. Peterson ◽  
Oliver Yaros ◽  
David L. Beam ◽  
Julian M. Dibbell ◽  
...  
Keyword(s):  
Financial Services ◽  
Design Methodology ◽  
Legal Issues ◽  
Use Cases ◽  
Proof Of Concept ◽  
Content Type ◽  
Wide Range ◽  
Practical Guidance ◽  
The Right ◽  
Practical Implications

Purpose To introduce blockchain in simple terms for business lawyers to be able to spot the right issues and ask the right questions. Design/methodology/approach This article provides an overview of blockchain, identifies two example use cases, and highlights some of the most pressing legal issues, including issues to address in on-chain programming, off-chain agreements and other issues when determining whether to implement a blockchain solution. Findings This article concludes that there has been a significant growth in investment and interest in blockchain. Numerous companies across different sectors have developed blockchain proof-of-concepts, with some heading towards production deployments. At this point, commercial blockchain is largely in the pilot or proof-of-concept stage across a wide range of use cases, with payments and supply chain being two of the most promising use cases. This article also identifies possible legal issues associated with blockchain. Practical implications Despite the growing interest in blockchain, it is still a novel topic to many business lawyers. It is very important that lawyers are able to identify the right issues and ask the right questions. Originality/value Practical guidance from experienced lawyers in the Technology Transactions and Financial Services Regulatory & Enforcement practices.

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