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Papers by Muhammad Zaly Shah

Research paper thumbnail of Reverse Logistics Activities for Household E-Waste Management: A Review

International Journal of Supply Chain Management, 2020

Recently, with the advancement of technologies in all fields of life, the competition has increas... more Recently, with the advancement of technologies in all fields of life, the competition has increased among manufacturing companies and industries. Reverse logistics is one of the significant and well-known activities to improve the business processes from the point of origin to destination. Reverse logistics activities have implemented in different business operations in which one of the significant areas is household e-waste management. With the passage of time, different types of household products have been piling up and cause for environment and waste issues. In order to tackle these mounting waste issues, reverse logistics activities are promoting product recovery and strategies for e-waste management. This review points out the fundamental of reverse logistics and looks into the existing activities for e-waste management. The main objective of this paper is to highlight the recent growing concern to controlling rising global pollution by household waste. The added value of this...

Research paper thumbnail of Evaluating the Sustainability of Traffic Growth in Malaysia

Journal of Traffic and Logistics Engineering, 2015

Research paper thumbnail of Pedestrian infrastructures and sustainable mobility in developing countries: the cases of Brazil and Malaysia

The objective of this paper is to compare two methods for assessing the quality of pedestrian inf... more The objective of this paper is to compare two methods for assessing the quality of pedestrian infrastructures, one developed in Brazil and another one in Malaysia. The analysis shows that the two cases differ in how they view pedestrian paths. The Brazilian case focuses more on the walkability aspects of the pedestrian path, while the Malaysian case view the pathway as purely an infrastructure for pedestrians to walk. In a different context, the Brazilian case analyzes the “soft” components, while the Malaysian case chooses to focus more on the “hard” components of a pedestrian path. In summary, the similarities and differences in the two cases present enormous opportunity for implementation and/or application. Depending on the needs of the analysts, the Brazilian case may be more suitable especially if walkability is an issue. However, if adequacy of pedestrian facilities is of importance, than the Malaysian case is more appropriate for application.

Research paper thumbnail of Evaluating the capability of walkability audit tools for assessing sidewalks

Sustainable Cities and Society, 2018

Abstract Even though assessing sidewalks is an integral component of walkability assessment tools... more Abstract Even though assessing sidewalks is an integral component of walkability assessment tools, no single study exists that adequately covers the relevance of existing walkability audits for sidewalk assessment. In this paper, an in-depth review of walkability audit tools is conducted. The primary objective of this study is to determine whether the existing tools consider factors such as safety, attractiveness, disability issues and path conditions that are essential for sidewalk assessment. This review shows that a limited number of audit tools consider disability issues, safety, and attractiveness. The tools reviewed mainly use path condition factors. In conclusion, recommendations are made for future walkability audits that focus on accessibility factors, as well as micro-scale design factors.

Research paper thumbnail of Proposing a New Score to Measure Personal happiness by Identifying the Contributing Factors

Measurement, 2019

Abstract Different assessment tools and questionnaires have been developed to measure happiness. ... more Abstract Different assessment tools and questionnaires have been developed to measure happiness. The Oxford Happiness Questionnaire (OHQ), that has 29 items, has been used widely to estimate personal happiness. The OHQ is used to quantify personal happiness based on an equal effectiveness assumption for all 29 items. Although the OHQ has been used by several studies, very few studies assess the contribution of the individual OHQ items in explaining personal happiness. The current study attempts to fill this gap by assessing the contribution of the individual OHQ items in explaining personal happiness as a latent variable. Structural Equation Modeling (SEM) is used to assess the relationship of the individual OHQ items in explaining personal happiness in Skudai, Johor, Malaysia. The significant OHQ items that are extracted from SEM results, are used to develop a new personal happiness measurement score. The SEM factor loading values are used to weight the extracted items. All usual clustering methods are used in this study and the most suitable one based on the higher silhouette value is chosen to cluster the proposed personal happiness index. Finally, the relationships between socio demographic factors and the proposed personal happiness index clusters are tested by Gamm and Pearson Chi-Square tests. The SEM results show that 16 out of the 29 OHQ items have poor associations with personal happiness and can be excluded from the model. Most of the non-significant items (items with low level of association) are negatively worded items and the majority of the significant items are related to personal attitudes. The proposed personal happiness index can help to save time and avoid confusion.

Research paper thumbnail of Investigating the Use of Active Transportation Modes Among University Employees Through an Advanced Decision Tree Algorithm

Civil and Sustainable Urban Engineering

Now more than ever, the health and economic benefits of active transportation (AT) are evident an... more Now more than ever, the health and economic benefits of active transportation (AT) are evident and several planning efforts and programs are particularly targeted at improving active transportation options for different populations, such as students and seniors. Administrative employees at universities received less attention in the literature than other population groups.This population spends a lot of time doing sedentary activities and behaviors during their working time. Thus, the present study used a C5 decision tree to examine the usage of university employees’ AT modes when they are out of campus to get to work, shopping, and leisure. The effects of the sociodemographic and living environment of employees on their AT mode choice were also examined. According to the results, walking was the most frequently used mode to get to work and leisure and public transport was the most frequently used mode to get to shopping. Transit station conditions (25), sidewalk availability and co...

Research paper thumbnail of A pedestrian level of service method for evaluating and promoting walking facilities on campus streets

ABSTRACT Modern universities seek policies to sustain the streets on their campuses by making cam... more ABSTRACT Modern universities seek policies to sustain the streets on their campuses by making campus streets pedestrian-friendly. To maintain inclusive streets, campus designers and planners should consider all users. Currently, there are efforts to evaluate street conditions for pedestrians. However, a limited range of pedestrian facilities and abilities make the results of previous studies insufficient to evaluate and promote inclusive walking facilities. This study attempts to create a foundation for evaluating and improving campus streets for pedestrians. This research presents pedestrian design indicators based on different guidelines that consider various pedestrian needs. This paper also introduces the pedestrian level of service (PLOS) for campuses, which is a measure to evaluate campus street facilities and infrastructure for pedestrians. An analytical point system comparing existing pedestrian facilities to a standard is proposed to estimate this PLOS. Although this method can be utilized on campuses around the world, this research uses it to assess streets on the campus of Universiti Teknologi Malaysia (UTM). This method can identify existing street problems for pedestrians and can be used to propose improvements to existing campus streets. Since this study tries to serve all requirements of pedestrians, specifically vulnerable users whether old or disabled, designers have room to implement accessible routes for pedestrians in campus streets.

Research paper thumbnail of Reverse Logistics Activities for Household E-Waste Management: A Review

International Journal of Supply Chain Management, 2020

Recently, with the advancement of technologies in all fields of life, the competition has increas... more Recently, with the advancement of technologies in all fields of life, the competition has increased among manufacturing companies and industries. Reverse logistics is one of the significant and well-known activities to improve the business processes from the point of origin to destination. Reverse logistics activities have implemented in different business operations in which one of the significant areas is household e-waste management. With the passage of time, different types of household products have been piling up and cause for environment and waste issues. In order to tackle these mounting waste issues, reverse logistics activities are promoting product recovery and strategies for e-waste management. This review points out the fundamental of reverse logistics and looks into the existing activities for e-waste management. The main objective of this paper is to highlight the recent growing concern to controlling rising global pollution by household waste. The added value of this...

Research paper thumbnail of Evaluating the Sustainability of Traffic Growth in Malaysia

Journal of Traffic and Logistics Engineering, 2015

Research paper thumbnail of Pedestrian infrastructures and sustainable mobility in developing countries: the cases of Brazil and Malaysia

The objective of this paper is to compare two methods for assessing the quality of pedestrian inf... more The objective of this paper is to compare two methods for assessing the quality of pedestrian infrastructures, one developed in Brazil and another one in Malaysia. The analysis shows that the two cases differ in how they view pedestrian paths. The Brazilian case focuses more on the walkability aspects of the pedestrian path, while the Malaysian case view the pathway as purely an infrastructure for pedestrians to walk. In a different context, the Brazilian case analyzes the “soft” components, while the Malaysian case chooses to focus more on the “hard” components of a pedestrian path. In summary, the similarities and differences in the two cases present enormous opportunity for implementation and/or application. Depending on the needs of the analysts, the Brazilian case may be more suitable especially if walkability is an issue. However, if adequacy of pedestrian facilities is of importance, than the Malaysian case is more appropriate for application.

Research paper thumbnail of Evaluating the capability of walkability audit tools for assessing sidewalks

Sustainable Cities and Society, 2018

Abstract Even though assessing sidewalks is an integral component of walkability assessment tools... more Abstract Even though assessing sidewalks is an integral component of walkability assessment tools, no single study exists that adequately covers the relevance of existing walkability audits for sidewalk assessment. In this paper, an in-depth review of walkability audit tools is conducted. The primary objective of this study is to determine whether the existing tools consider factors such as safety, attractiveness, disability issues and path conditions that are essential for sidewalk assessment. This review shows that a limited number of audit tools consider disability issues, safety, and attractiveness. The tools reviewed mainly use path condition factors. In conclusion, recommendations are made for future walkability audits that focus on accessibility factors, as well as micro-scale design factors.

Research paper thumbnail of Proposing a New Score to Measure Personal happiness by Identifying the Contributing Factors

Measurement, 2019

Abstract Different assessment tools and questionnaires have been developed to measure happiness. ... more Abstract Different assessment tools and questionnaires have been developed to measure happiness. The Oxford Happiness Questionnaire (OHQ), that has 29 items, has been used widely to estimate personal happiness. The OHQ is used to quantify personal happiness based on an equal effectiveness assumption for all 29 items. Although the OHQ has been used by several studies, very few studies assess the contribution of the individual OHQ items in explaining personal happiness. The current study attempts to fill this gap by assessing the contribution of the individual OHQ items in explaining personal happiness as a latent variable. Structural Equation Modeling (SEM) is used to assess the relationship of the individual OHQ items in explaining personal happiness in Skudai, Johor, Malaysia. The significant OHQ items that are extracted from SEM results, are used to develop a new personal happiness measurement score. The SEM factor loading values are used to weight the extracted items. All usual clustering methods are used in this study and the most suitable one based on the higher silhouette value is chosen to cluster the proposed personal happiness index. Finally, the relationships between socio demographic factors and the proposed personal happiness index clusters are tested by Gamm and Pearson Chi-Square tests. The SEM results show that 16 out of the 29 OHQ items have poor associations with personal happiness and can be excluded from the model. Most of the non-significant items (items with low level of association) are negatively worded items and the majority of the significant items are related to personal attitudes. The proposed personal happiness index can help to save time and avoid confusion.

Research paper thumbnail of Investigating the Use of Active Transportation Modes Among University Employees Through an Advanced Decision Tree Algorithm

Civil and Sustainable Urban Engineering

Now more than ever, the health and economic benefits of active transportation (AT) are evident an... more Now more than ever, the health and economic benefits of active transportation (AT) are evident and several planning efforts and programs are particularly targeted at improving active transportation options for different populations, such as students and seniors. Administrative employees at universities received less attention in the literature than other population groups.This population spends a lot of time doing sedentary activities and behaviors during their working time. Thus, the present study used a C5 decision tree to examine the usage of university employees’ AT modes when they are out of campus to get to work, shopping, and leisure. The effects of the sociodemographic and living environment of employees on their AT mode choice were also examined. According to the results, walking was the most frequently used mode to get to work and leisure and public transport was the most frequently used mode to get to shopping. Transit station conditions (25), sidewalk availability and co...

Research paper thumbnail of A pedestrian level of service method for evaluating and promoting walking facilities on campus streets

ABSTRACT Modern universities seek policies to sustain the streets on their campuses by making cam... more ABSTRACT Modern universities seek policies to sustain the streets on their campuses by making campus streets pedestrian-friendly. To maintain inclusive streets, campus designers and planners should consider all users. Currently, there are efforts to evaluate street conditions for pedestrians. However, a limited range of pedestrian facilities and abilities make the results of previous studies insufficient to evaluate and promote inclusive walking facilities. This study attempts to create a foundation for evaluating and improving campus streets for pedestrians. This research presents pedestrian design indicators based on different guidelines that consider various pedestrian needs. This paper also introduces the pedestrian level of service (PLOS) for campuses, which is a measure to evaluate campus street facilities and infrastructure for pedestrians. An analytical point system comparing existing pedestrian facilities to a standard is proposed to estimate this PLOS. Although this method can be utilized on campuses around the world, this research uses it to assess streets on the campus of Universiti Teknologi Malaysia (UTM). This method can identify existing street problems for pedestrians and can be used to propose improvements to existing campus streets. Since this study tries to serve all requirements of pedestrians, specifically vulnerable users whether old or disabled, designers have room to implement accessible routes for pedestrians in campus streets.