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Article
Publication date: 17 September 2012

S. Subramanya and Alireza Farahani

Since the introduction of Apple's App store and Google's Android Market (now Google Play) around the middle of 2008, the applications (commonly called Apps) for the iPhone…

Abstract

Since the introduction of Apple's App store and Google's Android Market (now Google Play) around the middle of 2008, the applications (commonly called Apps) for the iPhone and Android-based phones have surpassed 500,000 for each of the platforms. There are Apps for just about anything one can imagine. In the very near future, the use of smartphones and tablet devices for gathering information from the Web and for learning is expected to exceed the PC's and laptops. Given this, the design, development, and deployment of mobile Apps that support learning would be highly beneficial to students and learners. Such Apps could act as very effective supplements to the exiting learning modalities, especially in the areas of Math, Science, and Engineering, where most students have to grapple with abstract and hard concepts. This paper presents the approaches and design elements of an App for presenting concepts in mathematics and engineering.

Details

International Journal of Innovation Science, vol. 4 no. 3
Type: Research Article
ISSN: 1757-2223

Article
Publication date: 4 January 2016

Yang Liu, Fenglian Sun, Cadmus A. Yuan and Guoqi Zhang

The purpose of this paper is to discuss the possibility of using soldering process for the bonding of chip-on-flexible (COF) light-emitting diode (LED) packages to heat…

Abstract

Purpose

The purpose of this paper is to discuss the possibility of using soldering process for the bonding of chip-on-flexible (COF) light-emitting diode (LED) packages to heat sinks. The common bonding materials are thermal conductive adhesives. For thermal performance and reliability concerns, Tin-Bismuth (SnBi) lead-free solder paste was used for the connection of the COF packages and the Cu heat sinks by a soldering process in this study. Meanwhile, the geometrical effect of the SnBi solder layer on the thermal performance was also investigated.

Design/methodology/approach

The effects of the bonding materials and the area of the solder layers on the thermal performance of the LED modules were investigated by finite element simulation and experimental tests.

Findings

The SnBi soldered modules show much lower thermal resistance at the bonding layers than the adhesive-bonded LED module. Vertical heat transfer from the LED chips to the heat sinks is the primary heat dissipation mode for the SnBi soldered modules. Thus, the LED module with local solder layer shows similar LED thermal performance with the full-area soldered module. Meanwhile, the local soldering process decreases the possibility to form randomly distributed defects such as the large area voids and residue flux in the solder layers.

Research limitations/implications

The research is still in progress. Further studies mainly focus on the reliability of the samples with different bonding materials.

Practical implications

COF package is a new structure for LED packages. This study provides a comparison between SnBi solder and adhesive material on the thermal performance of the LED. Meanwhile, the authors optimized the geometrical design for the solder layer. The study provides a feasible bonding process for COF packages onto heat sinks.

Originality/value

This study provides a soldering process for the COF LED packages. The thermal performance of the LED light source was improved significantly by the new process.

Details

Microelectronics International, vol. 33 no. 1
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 2 November 2012

Samuel C. Yang

The use of mobile wireless data services continues to increase worldwide. New fourth‐generation (4G) wireless networks can deliver data rates exceeding 2 Mbps. The purpose…

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Abstract

Purpose

The use of mobile wireless data services continues to increase worldwide. New fourth‐generation (4G) wireless networks can deliver data rates exceeding 2 Mbps. The purpose of this paper is to develop a framework of 4G mobile applications that utilize such high data rates and run on small form‐factor devices.

Design/methodology/approach

The author reviews existing literature of mobile applications development and proposes using network‐related characteristics to create a conceptual framework of these applications.

Findings

Combining traffic symmetry and latency yields a 2×3 framework with six categories that characterize current and emerging 4G mobile applications, such as augmented reality, mobile social networking and m‐health.

Research limitations/implications

With the advent of high‐speed 4G networks, completely new mobile applications can be developed to leverage such high data rates, and a framework of such development efforts is highly desirable.

Originality/value

The framework is developed based on a perspective of technical characteristics because these characteristics intrinsically constrain the kinds of broadband mobile applications that can be developed. The framework should be useful in exploring opportunities of mobile application development and guiding future research in this area.

Details

Campus-Wide Information Systems, vol. 29 no. 5
Type: Research Article
ISSN: 1065-0741

Keywords

Article
Publication date: 12 January 2010

K. Sivaprasad, V. Swarnalatha, V.V. Ravikumar and V. Muthupandi

The purpose of this paper is to study the corrosion behavior of as‐cryorolled and cryorolled‐short annealed commercially pure aluminum (CP‐Al) in 3.5 percent NaCl solution.

Abstract

Purpose

The purpose of this paper is to study the corrosion behavior of as‐cryorolled and cryorolled‐short annealed commercially pure aluminum (CP‐Al) in 3.5 percent NaCl solution.

Design/methodology/approach

Cast and homogenized CP‐Al samples are cryorolled from 7 to 0.7 mm at −80°C. Samples are short annealed at 125, 150 and 175°C for 3 min. Transmission electron microscope studies are performed to understand the effect of cryorolling and short annealing on microstructure. Corrosion behavior of these samples in 3.5 percent NaCl solution is evaluated by potentiodynamic polarization studies.

Findings

Though cryorolling adversely affects corrosion resistance of CP‐Al, short annealing can restore the loss in corrosion resistance partially by the recovery process. The extent of restoration of loss in corrosion resistance by short annealing is influenced by the texture.

Originality/value

The results obtained by this investigation help in understanding the effect of cryorolling and short annealing on corrosion behavior of CP‐Al.

Details

Anti-Corrosion Methods and Materials, vol. 57 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 5 October 2015

Young-Soo Kim, Do-Hyung Park and Se-Bum Park

People can easily track and understand their usage pattern for any content (e.g. movies, games) or service (e.g. card payment, cell phone usage) by using technologies such…

Abstract

Purpose

People can easily track and understand their usage pattern for any content (e.g. movies, games) or service (e.g. card payment, cell phone usage) by using technologies such as the internet and smart phones. When consumers evaluate their past consumption patterns, they may experience two different kinds of regret: content-based or monetary-based. The purpose of this paper is to propose that perceived self-control, defined as the extent to which people believe they can control their usage, plays a moderating role in the tariff-choice process (flatrate vs pay-per-use) for two types of content: vice-based and virtue-based.

Design/methodology/approach

Two laboratory experiments were designed to test the hypotheses. There were a total of 200 participants (86 for Experiment 1 and 114 for Experiment 2) who completed the entire experimental process (i.e. stimulus exposure, questionnaire reporting, dependent variable measurement, manipulation of the independent variables, and control checks).

Findings

The results of this research provide evidence supporting the role of perceived self-control in tariff preference by showing that preference varies between flat-rate and pay-per-use tariff options. Specifically, virtue-based content users were more likely to prefer the pay-per-use tariff when their perceived self-control was low vs when it was high. In contrast, vice-based content users were more likely to prefer the flat-rate tariff when their perceived self-control was low vs when it was high.

Originality/value

There are three contributions of the present research. First, the authors investigated the effect of content type on tariff preference. Second, the authors suggest that there is a moderating effect of perceived self-control on tariff preference. Third, this study revealed the factors affecting consumers’ perceived self-control.

Details

Internet Research, vol. 25 no. 5
Type: Research Article
ISSN: 1066-2243

Keywords

Article
Publication date: 27 April 2020

Ken Yiu Kwan Fan, Patrick Lo, Kevin K.W. Ho, Stuart So, Dickson K.W. Chiu and Eddie H.T. Ko

This paper aims to study the information needs and online information-seeking behaviors on mobile platforms of performing arts students at a college level.

Abstract

Purpose

This paper aims to study the information needs and online information-seeking behaviors on mobile platforms of performing arts students at a college level.

Design/methodology/approach

Survey instruments were used to collect data from performing arts students at the Hong Kong Academy of Performing Arts (HKAPA), a metropolitan’s major performing arts tertiary institution. Data collected were analyzed through descriptive statistics and other statistical methods, and the music-related students were compared with the production-related students.

Findings

The result reveals that performing arts students all owned their mobile devices and often used mobile apps for non-academic purposes, but they did not often use mobile library services or read online academic contents with their mobile devices. The participants considered inadequate signal coverage, slow loading time, difficulty in reading on a mobile device and the lack of specialized mobile apps as more significant barriers affecting their usage. There are some significant differences between the music-related and production-related student groups in that music-related students watched lectures on the library websites and used electronic music scores more often than the production-related students.

Practical implications

This study contributes to the input for enhancements and policies to future mobile services and facilities of performing art libraries.

Originality/value

There have been scant studies on the mobile learning needs of performing arts students, especially in Asia.

Article
Publication date: 26 March 2021

Eshan Agrawal and Vinod Tungikar

Aluminium matrix composites are subjected to wear as well as higher temperature applications such as pistons, cylinder heads and blocks for car engines. Therefore, it is…

Abstract

Purpose

Aluminium matrix composites are subjected to wear as well as higher temperature applications such as pistons, cylinder heads and blocks for car engines. Therefore, it is important to evaluate the performance of aluminium metal matrix composite at elevated temperature.

Design/methodology/approach

In the present work wear performance of Al-TiC composite with 7.5% reinforcement of TiC powder is carried out at elevated temperature. The composite specimens are prepared with the help of centrifugal casting method to get the large segregation of reinforcement on the outer layer of the composite which is subjected to wear. Taguchi method is used for preparing design of experiments.

Findings

The wear test is performed on DUCOM pin on disc setup having the heating chamber facility. The results of wear test are analysed with the help of MINITAB 19 software. The results show that temperature has dominant effect on the wear rate. The mathematical model through regression is predicted for wear rate and coefficient of friction. The study of worn-out surface is performed with the help of scanning electron microscope. The micrographs show that the type of wear is changes from abrasive to severe wear and some delamination.

Originality/value

The experiments are conducted as per ASTM standards. The results give the mathematical equation for wear rate and coefficient of friction at elevated temperatures.

Details

World Journal of Engineering, vol. 19 no. 3
Type: Research Article
ISSN: 1708-5284

Keywords

Article
Publication date: 12 September 2016

Ferit Ficici

The paper aims to describe the Taguchi design method-based abrasive wear modeling of in situ AlB2 flake reinforced Al-4Cu matrix alloy composites.

Abstract

Purpose

The paper aims to describe the Taguchi design method-based abrasive wear modeling of in situ AlB2 flake reinforced Al-4Cu matrix alloy composites.

Design/methodology/approach

The abrasive wear behaviors of the composite samples were investigated using pin-on-disk method where the samples slid against different sizes of SiC abrasive grits under various testing conditions. The orthogonal array, signal-to-noise (S/N) ratio and analysis of variance were used to study the optimal testing parameters on composite samples.

Findings

The weight loss of composites decreased with increasing grit size and percentage reinforcement and increased with increasing sliding speed. The optimum test condition, at which the minimum weight loss is obtained, has been determined to be A3B3C1 levels of the control factors. Deviations between the actual and the predicted S/N ratios for abrasive weight losses are negligibly small with 99.5 per cent confidence level.

Originality/value

This paper fulfils an identification of Taguchi method-based abrasive wear behavior of AlB2/Al-4Cu metal matrix composites produced by squeeze casting under various testing conditions.

Details

Industrial Lubrication and Tribology, vol. 68 no. 6
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 9 February 2015

Necat Altinkök, Ferit Ficici and Aslan Coban

The purpose of this study is to optimize input parameters of particle size and applied load to determine minimum weight loss and friction coefficient for Al2O3/SiC…

Abstract

Purpose

The purpose of this study is to optimize input parameters of particle size and applied load to determine minimum weight loss and friction coefficient for Al2O3/SiC particles-reinforced hybrid composites by using Taguchi’s design methodology.

Design/methodology/approach

The experimental results demonstrate that the applied size is the major parameter influencing the weight loss for all samples, followed by particle size. The applied load, however, was found to have a negligible effect on the friction coefficient. Moreover, the optimal combination of the testing parameters was predicted. The predicted weight loss and friction coefficient for all the test samples were found to lie close to those of the experimentally observed ones.

Findings

The optimum levels of the control factors to obtain better weight loss and friction coefficient were A8 (particle size, 60 μm) and B1 (applied load, 20 N), respectively. Taguchi’s orthogonal design was developed to predict the quality characteristics (weight loss and friction coefficient) within the selected range of process parameters (particle size and applied load). The results were validated through ANOVA.

Originality/value

Firstly, hybrid MMCs ceramic powders were produced and then mechanical tests and optimization were performed.

Details

Industrial Lubrication and Tribology, vol. 67 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 12 June 2020

Anubhuti Saxena, Naval Garg, B.K. Punia and Asha Prasad

The primary objective of the present study is to explore the relationship between workplace spirituality and work stress among offshore and onshore employees of the Indian…

Abstract

Purpose

The primary objective of the present study is to explore the relationship between workplace spirituality and work stress among offshore and onshore employees of the Indian oil and gas industry. The present study also tends to study the difference in the stress level of offshore and onshore employees of the Oil and Gas Industry.

Design/methodology/approach

The size of the sample for the present study was 202 respondents. It includes 128 onshore employees and 74 offshore employees of oil and gas companies. Respondents were mainly managers and supervisors working in various departments of Oil and Natural Gas Corporation (ONGC), Cairn India, Reliance India Ltd (RIL), Bharat Petroleum Corporation Ltd (BPCL) and Indian Oil and Gas Ltd (IOCL). Since the different level of stress is experienced by employees at different stages of the organizational structure, thus study selected population comprising of managers and supervisors since they are believed to face similar work stressors. A variety of statistical tools like mean, t-test, correlation and multi-regression is used for the analysis of collected data.

Findings

Results show that all six dimensions of workplace spirituality are significantly negatively correlated with stress for onshore employees. However, the sense of community and gratitude are found insignificantly associated with stress for offshore employees. Stressful offshore conditions and excessive specialization might not allow offshore employees to cherish the community at the workplace and also the virtue of gratefulness. The offshore employees might have a certain level of gratitude and community system, but it is not sufficient for the employees to perceive a lower level of work relates to stress. The result gives the impression that the normal working conditions (onshore workplace) provide adequate opportunity to workplace spirituality to transcend its impact on work stress.

Originality/value

This is one of the pioneer studies that examined the role of workplace spirituality and stress in stress management of offshore and onshore employees of Indian Oil and gas companies.

Details

Journal of Organizational Change Management, vol. 33 no. 5
Type: Research Article
ISSN: 0953-4814

Keywords

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