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Article
Publication date: 24 January 2019

Vivek Singh, Brijesh Mishra and Rajeev Singh

Purpose of this study is to design a compact gap coupled anchor shape patch antenna for wireless local area network/high performance radio local area network and worldwide…

Abstract

Purpose

Purpose of this study is to design a compact gap coupled anchor shape patch antenna for wireless local area network/high performance radio local area network and worldwide interoperability for microwave access applications.

Design/methodology/approach

An anchor shape microstrip antenna is conceived, designed, simulated and measured. The anchor shape antenna is transformed to its rectangular equivalent by conserving the patch area. Modeling and simulation of the antenna is performed by Ansys high frequency structure simulator (HFSS) electromagnetic solver based on the concept of finite element method. The simulated results are experimentally verified by using Agilent E5071C vector network analyzer. Theoretical analysis of an electromagnetically gap coupled anchor shape microstrip patch antenna has been performed by obtaining the lumped element equivalent of the transformed antenna.

Findings

The proposed antenna has a compact conducting patch of dimension 0.26λ × 0.12λ mm2 (λ is calculated at lower resonating frequency of 3.56 GHz) with impedance bandwidths of 100 and 140 MHz and antenna gains of 1.91 and 3.04 dB at lower resonating frequency of 3.56 GHz and upper resonating frequency of 5.4 GHz, with omni-directional radiation pattern.

Originality/value

In literature, one does not encounter anchor shape antenna using the concept of gap coupling and parasitic patches. The design has been optimized for wireless local area network/worldwide interoperability for microwave access applications with a relatively low patch area (291.12 mm2) as compared to other reported antennas for wireless local area network/worldwide interoperability for microwave access applications. Transformed antenna and the actual experimental antenna behavior varies, but the resonant frequencies of the transformed antenna as observed by theoretical analysis and simulated results (by high frequency structure simulator) are reasonably close, and the percentage difference between the resonant frequencies (both at lower and upper bands) is within the permissible limit of 1-2.5 per cent. Results confirm the theoretical proposition of transformation of shapes in antenna design, which allows a designer to adapt the design shape according to the application.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 38 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 1 March 2008

Iasef Md Rian, Dongkuk Chang, Jin-Ho Park and Hyung Uk Ahn

This paper presents a pop-up technique based on origamic architecture as a technological design solution for post-disaster temporary shelter systems. First of all, the concepts of…

Abstract

This paper presents a pop-up technique based on origamic architecture as a technological design solution for post-disaster temporary shelter systems. First of all, the concepts of disaster and post-disaster are briefly introduced, and the roles and needs of post-disaster temporary shelter systems, particularly in emergency periods, are reviewed. Second, pop-up techniques based on origamic architecture are briefly discussed. Third, a formal language for opening the cards of origamic architecture is introduced, out of which a geometric elasticity has been developed. With the language, a variety of flexible and expandable designs for shelter structures can be generated by incorporating different pop-up techniques. Finally, a prototype shelter has been constructed to demonstrate the adaptability and sustainability of the shelter within the local environment and the affected society, considering portability, low-cost, and easy in assembling by any unskilled person.

Details

Open House International, vol. 33 no. 1
Type: Research Article
ISSN: 0168-2601

Keywords

Article
Publication date: 1 March 2003

Thomas Himmer, Anja Techel, Steffen Nowotny and Eckhard Beyer

Time reduction and quick geometrical changes of complex components and tools are currently the most important demands in product development. The manufacturing process presented…

1277

Abstract

Time reduction and quick geometrical changes of complex components and tools are currently the most important demands in product development. The manufacturing process presented in this paper is based on multiple additive and subtractive technologies such as laser cutting, laser welding, direct laser metal deposition and CNC milling. The process chain is similar to layer‐based Rapid Prototyping Techniques. In the first step, the 3D CAD geometry is sliced into layers by a specially developed software. These slices are cut by high speed laser cutting and then joined together. In this way laminated tools or parts are built. To improve surface quality and to increase wear resistance a CNC machining center is used. The system consists of a CNC milling machine, in which a 3 kW Nd:YAG laser, a coaxial powder nozzle and a digitizing system are integrated.

Details

Rapid Prototyping Journal, vol. 9 no. 1
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 4 March 2021

Amir Asgari, Ali Khorsandi Taskoh and Saeed Ghiasi Nodooshan

This paper aims to introduce a conceptual model for the shaping of the innovation district under the anchor approach by extracting the specifications of the fourth-generation…

Abstract

Purpose

This paper aims to introduce a conceptual model for the shaping of the innovation district under the anchor approach by extracting the specifications of the fourth-generation university.

Design/methodology/approach

This study selected 550 resources and reduced them to 190 to achieve the most appropriate resources. This study used a meta-synthesis analysis approach using a text-mining method due to the multidisciplinary and voluminous nature of contents.

Findings

The results first reveal the shaping process and the components of innovation districts, which are: innovational urban infrastructures, knowledge economy and competitiveness and academic development. Second, this study also shows the specifications of a fourth-generation university to shape innovation districts.

Practical implications

This study also informs the policymakers and researchers internationally about the implementation requirements of a fourth-generation university and the shaping mechanisms of an innovation district.

Originality/value

This paper is pioneer about two concepts, first, it shows the shaping process of an innovation district, providing a large-scale insight about the components and second, this illustrates for the first time the specifications of a fourth-generation University practically as an anchor institute to shape innovation district.

Details

International Journal of Innovation Science, vol. 13 no. 4
Type: Research Article
ISSN: 1757-2223

Keywords

Article
Publication date: 8 February 2013

Ravi Shanmugam

The aim of this study is to develop and empirically test a theoretical model of competition between anchor and non‐anchor stores in a shopping mall. In doing so, the goals are to…

1345

Abstract

Purpose

The aim of this study is to develop and empirically test a theoretical model of competition between anchor and non‐anchor stores in a shopping mall. In doing so, the goals are to extend the literature on retail co‐location to account for effects of anchor stores' quality levels, and to explain an observed pattern of choices of anchor‐store quality levels made by mall developers.

Design/methodology/approach

This study uses a game‐theoretic approach to model the actions of mall developers, stores, and consumers in a competitive framework, then verifies the equilibrium predictions of this model using an empirical approach and a data set including all major malls in the US and Canada.

Findings

The key finding of both the analytical and empirical models is that there exists a positive and concave (i.e. reverse U‐shaped) relationship between anchor quality and mall size, i.e. that the highest‐quality malls are typically found in the middle range of mall sizes.

Research limitations/implications

This study introduces a relatively basic framework that could be expanded to incorporate a more flexible variety of contract types between mall developers and tenants, as well as additional sources of consumer utility associated with a single visit to a mall.

Practical implications

This study provides mall developers with a basis for understanding the impact of anchor quality on competition between stores in a mall.

Originality/value

This study addresses a gap in both the analytical and empirical literature on determinants of mall traffic and profit, specifically pertaining to how these variables are affected by anchor stores and their quality levels.

Details

International Journal of Retail & Distribution Management, vol. 41 no. 2
Type: Research Article
ISSN: 0959-0552

Keywords

Article
Publication date: 29 July 2014

Jared R. Chapman and Bruce L. Brown

– The purpose of this paper is to examine two of Feldman and Bolino's proposals: career anchor plurality and career anchor relationships.

1652

Abstract

Purpose

The purpose of this paper is to examine two of Feldman and Bolino's proposals: career anchor plurality and career anchor relationships.

Design/methodology/approach

A novel method for examining the relationships between career anchors called “indices of mutual presence” is developed for this study to generate meaningful results from ordinal and ipsative career anchor data.

Findings

Evidence for some individuals having multiple career anchors was found. Complementary and exclusivity career anchor relationships are identified and a model for representing them is presented. The importance and possible benefit of understanding both an individual's preferred and “unpreferred” anchors is discussed. The non-reflexive nature of career anchors is explored and the idea of “mutually” exclusive career anchors is rejected. Weaknesses in the octagon shaped career anchor relationships diagram presented by Feldman and Bolino are discussed.

Research limitations/implications

Despite the benefits associated with forced-choice assessments, some have expressed concern because of the nature of this type of evaluation. Each time an item is preferred, another item must be “unpreferred.” Thus, for one item to have a high preference count, some other item must necessarily have lower preference counts. The resulting data is ordinal rather than interval or ratio. It contains information regarding order of preference, but provides little insight into magnitude of preference. This makes it difficult to identify and examine how much more or less one individual prefers an item when compared to another individual.

Originality/value

The second property of forced-choice data that raises concern is its ipsative nature. As respondents are constrained to unprefer an item each time the prefer one, the total preference counts remain the same for every individual. As a result, the preference scores for every individual will always sum to the same value. When data has this property, it is called ipsative. Ipsative data is not free to vary, and thus statistical methods which analyze variance may yield spurious results. Thus, traditional factorial statistical methods cannot be appropriately used with ipsative data (Baron, 1996; Bartram, 1996; Closs, 1996). It is commonly believed that researchers trade ease of use and accuracy for fewer available statistical tools when using forced-choice methods. However, this paper attempts to use “indices of mutual presence” developed for this study (described below) that do not rely on variance to generate meaningful results from ipsative career anchor data.

Details

Personnel Review, vol. 43 no. 5
Type: Research Article
ISSN: 0048-3486

Keywords

Article
Publication date: 6 February 2017

Boonping Soh, William Pao and XiaoHui Chen

This research aims to investigate the effects of manipulation of a torpedo’s geometries to attain higher terminal velocity. The parameters of interest include geometric changes of…

Abstract

Purpose

This research aims to investigate the effects of manipulation of a torpedo’s geometries to attain higher terminal velocity. The parameters of interest include geometric changes of the original design, as well as sea water properties that reflect water depth in South China Sea.

Design/methodology/approach

The research make use of computational fluid dynamics (CFD) software, FLUENT, to solve viscous incompressible Navier–Stokes equations with two equations k-epsilon turbulent model. The calculated drag coefficient is subsequently used to calculate the maximum attainable terminal velocity of the torpedo.

Findings

It was found that the terminal velocity can be improved by sharper tip angle, greater aspect ratio, greater diameter ratio and optimum rear angle at 30°. Sensitivity of drag coefficient toward each of the parameters is established in this paper.

Originality/value

The paper, in addition to verifying the importance of aspect ratio, has also established the tip angle, diameter ratio and rear angle of the torpedo as important geometric aspects that could be tuned to improve its terminal velocity.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 2
Type: Research Article
ISSN: 0961-5539

Keywords

Open Access
Article
Publication date: 13 October 2023

Weng Marc Lim

This article aims to explain the role of philosophical anchors and research paradigms in business research, and how they can be extrapolated in the transformative era of…

2664

Abstract

Purpose

This article aims to explain the role of philosophical anchors and research paradigms in business research, and how they can be extrapolated in the transformative era of automation, digitalization, hyperconnectivity, obligations, globalization and sustainability (ADHOGS) in the midst of disruption, volatility, uncertainty, complexity and ambiguity (DVUCA).

Design/methodology/approach

This article entails a general review based on the 3Es of exposure, expertise and experience, delving into the ontological, epistemological, methodological, axiological and rhetorical aspects of the major research paradigms—i.e. positivism, post-positivism, constructivism, interpretivism and pragmatism—and their interplay with the emergent trends shaping business research.

Findings

This article underscores the multifaceted nature of business research in the modern day, with an increasing need for blending, or shifting between, research paradigms to address the complex issues arising from automation, digitalization, hyperconnectivity, obligations, globalization and sustainability (ADHOGS). This article also highlights the nuanced interplay between research paradigms and theoretical perspectives, demonstrating the rich, diverse potential of business research inquiries.

Research limitations/implications

While this article provides a broad overview of the interplay between research paradigms and emerging trends, future research could explore each of these interplays in greater detail, conducting empirical studies or utilizing specific case studies.

Practical implications

Researchers and practitioners should be open to adopting, combining or switching between different paradigms according to the demands of their research questions, context and trends shaping the business landscape, thereby underscoring the need for methodological flexibility and reflexivity in business research.

Social implications

The shift toward embracing digital transformations and integrating sustainability in business research holds significant implications, driving socially responsible and sustainable business practices at the micro-level, and by extension, industrial revolution and sustainable development at the macro-level.

Originality/value

This article offers a holistic and contextualized view of the philosophy of science and research paradigms for business research, bridging the gap between philosophical foundations and contemporary research trends.

Article
Publication date: 23 April 2024

Jiwon Chung, Hyunbin Won, Hannah Lee, Soah Park, Hyewon Ahn, Suhyun Pyeon, Jeong Eun Yoon and Sumin Koo

The objective of this study was to develop wearable suit platforms with various anchoring structure designs with the intention of improving wearability and enhancing user…

Abstract

Purpose

The objective of this study was to develop wearable suit platforms with various anchoring structure designs with the intention of improving wearability and enhancing user satisfaction.

Design/methodology/approach

This study selected fabrics and materials for the suit platform through material performance tests. Two anchoring structure designs, 11-type and X-type are compared with regular clothing under control conditions. To evaluate the comfort level of the wearable suit platform, a satisfaction survey and electroencephalogram (EEG) measurements are conducted to triangulate the findings.

Findings

The 11-type exhibited higher values in comfort indicators such as α, θ, α/High-β and lower values in concentration or stress indicators such as β, ϒ, sensorimotor rhythm (SMR)+Mid-β/θ, and a spectral edge frequency of 95% compared to the X-type while walking. The 11-type offers greater comfort and satisfaction compared to the X-type when lifting based on the EEG measurements and the participants survey.

Originality/value

It is recommended to implement the 11-type when designing wearable suit platforms. These findings offer essential data on wearability, which can guide the development of soft wearable robots.

Details

International Journal of Clothing Science and Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 19 September 2022

Jinliang Liu and Xincheng Su

The effects of failure mode and strain conditions of CFRP, concrete and stirrups on the shear capacity of reinforced beams bonded by geopolymer and epoxy are studied. In addition…

Abstract

Purpose

The effects of failure mode and strain conditions of CFRP, concrete and stirrups on the shear capacity of reinforced beams bonded by geopolymer and epoxy are studied. In addition, a prediction model of the ultimate bearing capacity of CFRP-shear-strengthened beams is proposed, which considers adhesive performance parameters adhesive performance parameter ßE and FRP width parameter ßw.

Design/methodology/approach

This paper presents an experimental study on ultimate bearing capacity of CFRP-shear-strengthened pre-cracked beams with geopolymer and epoxy resin, which considers parameters such as impregnated adhesives types and CFRP-strengthened scheme.

Findings

The failure modes of CFRP-strengthened beams bonded by geopolymer are the combination of the CFRP-concrete interface substrate failure and fracture failure of CFRP, and that of epoxy is the local substrate failures with small area. The ultimate load of CFRP-strengthened beams is directly affected by the failure modes. The ultimate bearing capacity of CFRP-strengthened beams with geopolymer is 91.4% of that of epoxy resin. Compared with ultimate bearing capacity of CFRP-strengthened beams with U-shaped, that of complete-wrapping increases by 2.5%. Moreover, the stirrup peak strain is reduced by more than 30% in CFRP-strengthened beams bonded with geopolymer and epoxy resin in comparison with the unstrengthened beam. The existing prediction model cannot accurately predict the CFRP shear capacity contribution of strengthened beams with different CFRP-strengthened schemes and adhesive properties. The estimated results are much lower than the test data, and the deviation is much larger than 20%.

Originality/value

Geopolymer alternative to epoxy as an adhesive is feasible and effective for CFRP reinforcement. Furthermore, the accuracy is improved by introducing parameters about adhesive properties based on the existing prediction model. The estimated results are in excellent agreement with the test data, and the deviation is controlled within −12.80%, and the model is suitable for predicting the shear capacity of FRP-strengthened beams with ßf = 90° in shear capacity database.

Details

Multidiscipline Modeling in Materials and Structures, vol. 18 no. 5
Type: Research Article
ISSN: 1573-6105

Keywords

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