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Article
Publication date: 11 October 2022

Mazwan Mansor, Syamsul M., Yusnizam Yusuf and Mohd Nazri Abdul Rahman

This study aims to present a numerical study of atomic structure for aluminium nitride (AlN) when the crystal was assumed grown on different orientation of sapphire…

Abstract

Purpose

This study aims to present a numerical study of atomic structure for aluminium nitride (AlN) when the crystal was assumed grown on different orientation of sapphire substrate. The change of the AlN atomic structure with sapphire orientation was associated to the interface between the AlN and the sapphire. The results from this study would provide a guideline in selecting suitable orientation of sapphire for obtaining desirable AlN crystals, in particular, for reducing threading dislocation density in the AlN/sapphire templates for developing UV LEDs.

Design/methodology/approach

The approach of atomic structure by visualization for electronic and structural analysis numerical method to develop shape of atomic geometry to evaluate which plane are more suitable for the AlGaN technology UV-LED based.

Findings

The calculation based on ratio on first and second layers can be done by introduction of lattice constant.

Research limitations/implications

With plane’s color of cutting plane on bulky materials, all the shape looks the same.

Practical implications

By implementing this method, the authors can save time to find the most suitable plane on the growth structure.

Originality/value

All authors of this research paper have directly participated in the planning, execution or analysis of the study; all authors of this paper have read and approved the final version submitted; the contents of this manuscript have not been copyrighted or published previously; the contents of this manuscript are not now under consideration for publication elsewhere; the contents of this manuscript will not be copyrighted, submitted or published elsewhere, whereas acceptance by the journal is under consideration.

Details

Microelectronics International, vol. 40 no. 1
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 15 July 2022

Khairul Mohd Arshad, Muhamad Mat Noor, Asrulnizam Abd Manaf, Kawarada H., Falina S. and Syamsul M.

Vertical-cavity surface-emitting laser (VCSEL) is a high-performance semiconductor device made of unique epitaxial layers grown on n-type GaAs or InP substrates. The…

Abstract

Purpose

Vertical-cavity surface-emitting laser (VCSEL) is a high-performance semiconductor device made of unique epitaxial layers grown on n-type GaAs or InP substrates. The VCSEL’s thermal resistance, Rth, is an essential metric that reflects its thermal properties and dependability. The purpose of this paper is to develop packaging for 1 mm2 VCSEL chips made of a variety of materials, such as ceramic, lead frame and printed circuit board (PCB)-based packaging, as well as provide an idea or design that can withstand and perform well in terms of Rth and heat dissipation during operation. SolidWorks 2017 and AutoCAD Mechanical 2017 software were used to publish all thoughts and ideas, including the size dimensions (x, y and z) and material choices for each package.

Design/methodology/approach

Following the modelling and material selection, the next step is to use the Ansys Mechanical Structural FEA Analysis software to simulate all packaging for Rth and determine which packaging produced the best result, therefore, determining the heat dissipation for each packing. All parameters were used based on the standard cleanroom requirement for the industrial manufacturing backend process, where the cleanroom classification is 10,000 particles (ISO 7). The results demonstrated that the ceramic and lead frame provided good Rth values of 7.3 and 7.0 K/W, respectively, when compared to the PCB, which provided more than 80 K/W; thus, the heat dissipation for PCB packaging also increased.

Findings

As a result of the research, it was determined that ceramic and lead frame packaging are appropriate and capable of delivering good Rth and heat dissipation values when compared to PCB. In comparison to PCB, which requires numerous modifications, such as adding via holes and a thermal bar in an attempt to lower the Rth value, neither packaging requires improvement. Ceramic was chosen for development based on Rth's highest performance, with the actual device consisting of a lead frame and PCB. The Zth measurement test was carried out on a ceramic package, and the Rth result was comparable to the simulation result of 7.6 K/W, indicating that simulation was already proved for research and development.

Originality/value

The purpose of this study is to determine which proposed packaging design would give the highest Rth performance of a 1 mm2 chip as well as the best heat dissipation. In comparison to other studies, VCSEL packaging used the header and window cap as package components with a wavelength of 850 nm, and other VCSEL packaging developments used the sub mount on ceramic package with an output power ranging from 500 mW to 2 W, whereas this study used a huge wavelength and an output power of 4 W.

Details

Microelectronics International, vol. 40 no. 1
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 11 October 2022

Naeemul Islam, Nur Syahadah Yusof, Mohamed Fauzi Packeer Mohamed, Syamsul M., Muhammad Firdaus Akbar Jalaludin Khan, Nor Azlin Ghazali and Mohd Hendra Hairi

The purpose of this study is to demonstrate a pseudomorphic High Electron Mobility Transistor (pHEMT) cutoff frequency (fT) and maximum oscillation frequency (fmax) are…

Abstract

Purpose

The purpose of this study is to demonstrate a pseudomorphic High Electron Mobility Transistor (pHEMT) cutoff frequency (fT) and maximum oscillation frequency (fmax) are determined by the role of its gate length (Lg). Theoretically, to obtain an Lg of 1 µm, the gate’s resist opening must be 1 µm wide. However, after the coat-expose-develop (C-E-D) process, the Lg became 13% larger after metal evaporation. This enlargement is due to both resist thickness and its profile.

Design/methodology/approach

This research aims to optimize the 1-µm Lg InGaAs-InAlAs pHEMT C-E-D process, where the diluted AZ®nLOF™ 2070 resist with AZ® EBR solvent technique has been used to solve the Lg enlargement problem. The dilution theoretically allows the changing of a resist thickness to different film thickness using the same coating parameters. Here, for getting a new resist, which is simply called AZ 0.5 µm, the experiment’s important parameters such as the coater’s spin speed of 3,000 rpm and soft bake at 110°C for 5 min are executed.

Findings

The newly mixed AZ 0.5 µm resist has presented a high resolution and undercut profile rather than standard AZ 1 µm resist. Hence, the Lg metallization after using AZ 0.5 µm optimized process showed better results than AZ 1 µm which used the standard process.

Originality/value

The outcome of the optimization has reached that it is possible to get a nearly sub-µm range gate’s opening using a diluted resist, and at the same time retaining a high resolution and undercut profile.

Details

Microelectronics International, vol. 40 no. 1
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 27 April 2022

Animesh Singh and Rashi Banerji

The purpose of this paper is to investigate the relationship between employee happiness at work and organizational citizenship behaviour in Indian private sector banks. In…

Abstract

Purpose

The purpose of this paper is to investigate the relationship between employee happiness at work and organizational citizenship behaviour in Indian private sector banks. In this study, happiness at work is represented by three constructs: job satisfaction, affective commitment and work engagement. The study also investigates whether employees’ perception of diversity management practices mediates the relationship between happiness at work and organizational citizenship behaviour.

Design/methodology/approach

A total of 498 responses from employees of three major private sector banks in the Delhi-NCR region were analysed to investigate relationships between dependent, independent and mediating variables by using structural equation modelling.

Findings

Happiness at work has a significant positive impact on organizational citizenship behaviour, and employees’ perception of diversity management plays a strong mediating role between the relationship of happiness at work and organizational citizenship behaviour.

Practical implications

Happiness at work and perception of diversity management have a significant influence on organizational citizenship behaviour of banking employees. Private sector banks in India need to make strategies for workplace happiness and diversity management so that the employees work as citizens of the bank and willingly take responsibility for extra-role behaviour along with their assigned roles.

Originality/value

The findings of this paper reveal that although employees may experience happiness at work represented by job satisfaction, affective commitment and work engagement, their happiness is less likely to be reflected in their organizational citizenship behaviour until they have a positive perception of the workforce diversity management practices. To the best of the authors’ knowledge, this study is unique in terms of its emphasis on the mediating role of diversity management on employees’ happiness and organizational citizenship behaviour in Indian private sector banks.

Article
Publication date: 23 August 2013

Syamsul Herman bin Mohammad Afandi, Zaiton Samdin and Ahmad bin Shuib

The study aims to conduct a critical analysis of available economic tools to value non‐market rural tourism products and services, and assess the strengths and weaknesses…

Abstract

Purpose

The study aims to conduct a critical analysis of available economic tools to value non‐market rural tourism products and services, and assess the strengths and weaknesses of these tools.

Design/methodology/approach

The paper reviews existing valuation methods to better understand how estimates of rural tourism products and services are conducted. The paper also critically evaluates the applicability of these methods.

Findings

The study concludes that the selection of a method is mainly based on applicability of the approach. In assessing the non‐market value of rural tourism products and services, a method is selected by identifying its strengths and weaknesses. A review of previous studies suggests the evaluation of the practicality of each method according to the topic studied.

Originality/value

The paper contributes to a better understanding of available valuation approaches that give reliable estimates on non‐market rural tourism products and services.

Details

Worldwide Hospitality and Tourism Themes, vol. 5 no. 4
Type: Research Article
ISSN: 1755-4217

Keywords

Article
Publication date: 3 February 2020

Yaser Gamil, Majid A. Abdullah, Ismail Abd Rahman and Muhammad Mujtaba Asad

In this advanced era of Industrial Revolution 4.0, as an element of cyber physical systems, the Internet of Things (IoT) has been applied in many different industries;…

1981

Abstract

Purpose

In this advanced era of Industrial Revolution 4.0, as an element of cyber physical systems, the Internet of Things (IoT) has been applied in many different industries; however, its adoption in the construction industry is still limited to a few applications. This study uncovers, identifies and assesses the challenges of adopting IOT in construction projects. The challenges have been identified through the briefed literature review and a survey instrument from construction industries in Malaysia.

Design/methodology/approach

In this study, the quantitative research approach has been used and data have been collected through a questionnaire survey for construction practitioners. Whereas, respondents to the questionnaire are practitioners from the Malaysian construction industry. The method of sampling implied is random sampling technique whereby the final sample size is 132 participants. Moreover, the gathered data has been analysed using univariate approach via standard deviation and average index in SPSS Software 22.0.

Findings

The results of this study indicated the most dominant challenges are lack of safety and security, lack of documented standards, lack of benefit awareness, improper introduction of IOT and lack of robustness in connectivity. This study also examined that the awareness of construction practitioners toward the understanding of IOT and its possibility to be applied and extended in construction projects and determined that construction practitioners are aware of IOT benefits to improve the efficiency of construction projects.

Practical implications

The study presents a better understanding of IOT in the construction industry and their potential challenges, which helps the construction policymakers to avoid encounters related to challenges and provide education-based campaigns to educate construction practitioners on the concept and importance of using IOT in the construction sector.

Originality/value

This is a unique study because of its nature in this advance era of industry 4.0. Furthermore, it is specifying the latest trend associated with IOT in the construction industry and addressing the challenges of implementation, which is crucial to exploit and take advantage of the full potential of IoT benefits.

Details

Journal of Engineering, Design and Technology , vol. 18 no. 5
Type: Research Article
ISSN: 1726-0531

Keywords

Article
Publication date: 7 February 2022

Ernest Kissi, Clinton Aigbavboa and Ewald Kuoribo

The momentous contribution of innovative technologies has made a significant impact in several sectors globally. However, the construction industry is undoubtedly lagging…

Abstract

Purpose

The momentous contribution of innovative technologies has made a significant impact in several sectors globally. However, the construction industry is undoubtedly lagging when it comes to technology usage. Thus, this study aims to explore the various emerging technologies in the construction industry while noticing stakeholders’ challenges and strategies in its use.

Design/methodology/approach

The study used a pragmatism research philosophy together with a quantitative research strategy in determining emerging technologies in the construction industry while noticing stakeholder challenges and strategies. Data were obtained from a total of 80 construction stakeholders through a structured questionnaire survey. The analysis was done with descriptive statistics using mean score ranking and a one-sample t-test.

Findings

Each emerging technology challenge was analysed and compared to see how pressing the challenges were as well as the aligned strategies. A key indication of this study is that the familiarity of the various emerging technologies was based on how many occasions one had an encounter with the technology.

Practical implications

The discussion’s findings contribute to a better knowledge to construction stakeholders on the challenges and strategies for rising technology adoption and implementation competencies.

Originality/value

The study reckoned stakeholders’ challenges on the emerging technologies in the construction industry context and recommended strategies to balloon the adoption of these emerging technologies in a developing country setting.

Details

Construction Innovation , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1471-4175

Keywords

Article
Publication date: 9 September 2021

Syamsul Anwar, Taufik Djatna, Sukardi and Prayoga Suryadarma

Supply chain risks (SCRs) have uncertainty and interdependency characteristics that must be incorporated into the risk assessment stage of the SCR management framework…

Abstract

Purpose

Supply chain risks (SCRs) have uncertainty and interdependency characteristics that must be incorporated into the risk assessment stage of the SCR management framework. This study aims to develop SCR networks and determine the major risk drivers that impact the performance of the sago starch agro-industry (SSA).

Design/methodology/approach

The risk and performance variables were collected from the relevant literature and expert consultations. The Bayesian network (BN) approach was used to model the uncertain and interdependent SCRs. A hybrid method was used to develop the BN structure through the expert’s knowledge acquisitions and the learning algorithm application. Sensitivity analyses were performed to examine the significant risk driver and their related paths.

Findings

The analyses of model indicated several significant risk drivers that could affect the performance of the SSA. These SCR including both operational and disruption risks across sourcing, processing and delivery stage.

Research limitations/implications

The implementation of the methodology was only applied to the Indonesian small-medium size sago starch agro-industry. The generalization of findings is limited to industry characteristics. The modelled system is restricted to inbound, processing and outbound logistics with the risk perspective from the industry point of view.

Practical implications

The results of this study assist the related actors of the sago starch agro-industry in recognizing the major risk drivers and their related paths in impacting the performance measures.

Originality/value

This study proposes the use of a hybrid method in developing SCR networks. This study found the significant risk drivers that impact the performance of the sago starch agro-industry.

Details

International Journal of Productivity and Performance Management, vol. 71 no. 6
Type: Research Article
ISSN: 1741-0401

Keywords

Article
Publication date: 25 November 2019

Fiona Jane Francis, Azman Hassan, Syamsul Herman Mohd Afandi and Alias Radam

This study aims to incorporate visitors’ preferences for sustainable development into the policy framework of Rainforest Discovery Centre (RDC), Sabah, Malaysia.

Abstract

Purpose

This study aims to incorporate visitors’ preferences for sustainable development into the policy framework of Rainforest Discovery Centre (RDC), Sabah, Malaysia.

Design/methodology/approach

A stated preference technique known as choice experiment (CE) method is used in this study. Four management attributes, namely, information provision (IP), protection level (PL), guided tour (GT) and entrance fee (FEE), were identified as the most relevant aspects of the RDC in Sabah. Two econometrics models which are conditional logit and random parameter logit were estimated to achieve the purpose of the study.

Findings

This study finds that visitors support the proposed development of RDC. The alteration of protection level (i.e. improvement of “PL” attribute) is the most concerning matter among visitors. Since the random parameter logit model revealed that PL is specified as random, the individual heterogeneity exists for PL.

Practical implications

The current issues in ecotourism were studied and integrated into the methodology. A unique and comprehensive policy structure was developed, and enables to respond with any contemporary issues linked to protected areas (PA) without neglecting the natural and cultural endowments.

Originality/value

This study presents an in-depth understanding of visitors’ preferences in the ecotourism industry and used CE as a mechanism tool to explore visitors’ preferences. This study incorporates the conceptualisation of visitors’ preferences and sustainable tourism development into the PA framework structure.

目的

这项研究的目标是将游客的偏好纳入马来西亚沙巴的热带雨林探索中心(RDC)的政策框架中以促进可持续性发展。

设计/方法/方法

种陈述偏好的技术称为选择实验(CE)的方法被采用在本文。,其中四个管理属性; 包括资讯供应(IP) 、 保护水平(PL) 、导游陪同的旅游(GT) 和入门收费(FEE), 视为沙巴RDC最相关的方面。,另外两项計量經濟模型有条件Logit和随机参数Logit模型也被用以估计来达到研究目的。

结果

这项研究发掘游客是支持RDC的拟开发。,保护级别的改造(即“ PL”属性的改进)也是访客中最关注的事。,由于随机参数Logit模型被指定为随机, 因此PL是存在个别异质性。

实际含义

此项研究研证了生态旅游中的当前问题, 并且将其综合到方法论中。,研发了独特而全面的政策结构, 以便能应对任何与受保护区域相关的当前问题, 同时非忽视自然和文化禀赋。

独创性/价值

这项研究使用了CE作为一种机制来探索游客的偏好, 及深入了解生态旅游业中游客的偏好。,此项研结合游客偏好和可持续旅游业发展的概念并纳入了PA框架结构。

Objetivo

Este estudio tiene como objetivo incorporar las preferencias de los visitantes por el desarrollo sostenible en el marco de políticas de Rainforest Discovery Centre (RDC), Sabah, Malasia.

Diseño/metodología/enfoque

En este estudio se utiliza una técnica de preferencia declarada que se conoce como método del experimento de elección (CE). Cuatro atributos de gestión, a saber, suministro de información (PI), protección nivel (PL), visita guiada (GT) y tarifa de entrada (FEE) fueron identificados como los aspectos más relevantes de la RDC en Sabah. Dos modelos econométricos que son logit condicional y logit de parámetro aleatorio fueron estimado para lograr el propósito del estudio.

Resultados

Este estudio encuentra que los visitantes apoyan el desarrollo propuesto de RDC. La alteración de El nivel de protección (es decir, la mejora del atributo "PL") es el asunto más preocupante entre los visitantes. Ya que El modelo logit de parámetros aleatorios reveló que PL se especifica como aleatorio, la heterogeneidad individual existe para PL.

Implicaciones practicas

Los temas actuales en ecoturismo fueron estudiados e integrados en la metodología. Se desarrolló una estructura de política única y completa que permite responder con los temas contemporáneos vinculados a las áreas protegidas (AP) sin descuidar los aspectos naturales y culturales dotaciones.

Originalidad/valor

Este estudio presenta una comprensión profunda de las preferencias de los visitantes en el industria del ecoturismo y utilizó CE como una herramienta de mecanismo para explorar las preferencias de los visitantes. Este estudio incorpora la conceptualización de las preferencias de los visitantes y el desarrollo del turismo sostenible en el Estructura del Marco PA.

Article
Publication date: 15 June 2020

Dandun Mahesa Prabowoputra, Aditya Rio Prabowo, Syamsul Hadi and Jung Min Sohn

In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future…

Abstract

Purpose

In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future energy-related crises. This study, therefore, aims to determine the variations effects in geometry and the geometrical factors on turbine performance.

Design/methodology/approach

The developed aspects are selected to determine the blade shape, its number and multistage requirements. The study was conducted in 3D simulation, with Ansys software used to calculate a series of computational fluid dynamic problems. The aspect ratio applied in this study utilized the ratio of the overall diameter of the rotor height (D / H), which is 1.

Findings

The results showed that the highest Cp-max value, number of blades and stages were 0.2, two and three, respectively. Furthermore, these attributes combined to improve the performance of hydroturbines.

Research limitations/implications

The research was fully conducted using numerical simulation, which requires sustainable research in the form of laboratory experiments. Also, pioneer experiments were conducted using benchmarking to ensure the results obtained are reliable.

Practical implications

Hydropower is one of the best renewable energy sources in Indonesia with a large potential in the archipelago and tropical countries due to rivers and various water sources. The current generated is a useful reference for Savonius design.

Originality/value

The originality of this study is to examine the three aspects of the geometry of the rotor, such as the number and shape of blades, as well as the stages in the same boundary conditions. Therefore, the comparison of the effects of changes in geometry on turbine performance is more acceptable and complete compared to the pioneer works, which focused on a parameter. This research combines several aspects to determine the effect of rivers and various water sources on the hydroturbine.

Details

Multidiscipline Modeling in Materials and Structures, vol. 17 no. 1
Type: Research Article
ISSN: 1573-6105

Keywords

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