Ali Keyvanfar | Kennesaw State University (original) (raw)

Papers by Ali Keyvanfar

The existent research investigates the ability of Bacillus bacteria species to improve the streng... more The existent research investigates the ability of Bacillus bacteria species to improve the strength of Geo-polymer concrete based on bio-mineralization mechanism. The appropriate cell concentration of bacteria was introduced in ordinary and Geo-polymer concrete by way of the mixing water to compare their strength and durability. In this research, it was found that the compressive strength growth in Geo-polymer bacterial concrete was the highest in comparison to ordinary bacterial concrete at 90 th day. For durability study, the specimens were immersed in 5% H2SO4 solution and the result showed that Geo-polymer bacterial concrete had the least weight and strength losses than ordinary bacterial concrete at different ages. This improvement was due to the temperature condition of Geo-polymer bacterial concrete to survive more bacteria for purpose of calcite precipitation. The density and uniformity of concrete were also examined by ultrasonic pulse velocity (UPV) test. The result showed...

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Sustainability, 2018

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Sustainability, 2018

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Sustainability, 2017

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Desalination and Water Treatment, 2016

ABSTRACT Indigenous microalgae were isolated from agro-industrial wastewater in Johor, Malaysia a... more ABSTRACT Indigenous microalgae were isolated from agro-industrial wastewater in Johor, Malaysia and were screened for the greatest goal of mass cultivation in IPASA, UTM Skudai in order to determine their potential as biomass and biodiesel sources. Bold’s Basal Medium nutrient media recipes were used to isolate the largest number of colonies from each field sample. These nutrient instructions were altered in order to optimize the isolation and growth dynamics of particular colonies. The isolates were classified based on the morphological appearance of the culture and the microscopic cellular appearance of the isolated colonies. Isolates comprised several common green microalgae and cyanobacteria, in which one of the ideal candidates was nominated for further investigation. Lipid content was determined for particular strains that illustrated relatively quick growth. The results revealed that Chlamydomonas incerta achieved the highest lipid content of 42.6% of biomass after 2 days, as well as the highest lipid productivity of 0.197mg/L.d-1 when the initial COD concentration was 500 mg/L. C. incerta that showed the high growth rate, resistance to invasion, and contained adequate amount of lipid was examined for its potential as a sustainable biomass and biodiesel feedstock.

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Jurnal Teknologi, 2015

Risk management is one of the most essential and significant part of construction projects due to... more Risk management is one of the most essential and significant part of construction projects due to assuring the attainment of project goals. Because of increasing global energy, more attention is needed to be paid towards risk management in oil and gas companies. The aim of this study is to improve the implementation of risk management within contractor companies in the oil and gas construction project through the evaluation of the most import risk groups and the barriers of implementing risk management in this part of industry. The current study is carried out in Iran and the scope of study includes only the construction project in oil and gas companies. A total of 48 questionnaires were distributed to the respondents and only 35 were obtained duly answered. The data was analyzed using SPSS software during the preliminary stage of this study, a variety of risk groups have been studied, six of it were identified to be the most probable in oil and gas construction projects which inc...

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ABSTRACT Self-healing concretes are being widely recognized as a remedial technique to improve th... more ABSTRACT Self-healing concretes are being widely recognized as a remedial technique to improve the durability of concrete. Although, few review papers on self-healing concrete were published, a strong review on all aspects of self-healing concrete cannot be found. In this paper, natural, chemical and biological processes of self-healing concrete technologies were completely reviewed. The main focus of the study is for the biological processes. The review presents a new insight into the research for the treatment of unexpected cracking of concrete. The information presented in this paper can be considered significant for biotechnologists and bioprocess engineers to have comprehensive updates on the current status-quo of self-healing concrete.

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Biological self-healing concrete is a new idea to ha ve concrete structures with more durability.... more Biological self-healing concrete is a new idea to ha ve concrete structures with more durability. Althou gh, several papers have been published on biological self-healing conc rete, a suitable instruction to conduct this type o f studies is not reported. Aim of this paper is collecting comprehensive infor mation about conducting a study on self-healing con cretes based on previous studies. This paper present many new ideas that have not been completely study. Some idea suc h as application of fungi, thermopiles bacteria, mix culture of microor ganisms or using of aerobic or anaerobic bacteria t o design biological selfhealing concrete are suggested in this paper. Ideas of this paper can help researchers to find a suita ble and novel subject in biological self-healing area to conduct a strong re search.

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Desalination and Water Treatment, 2013

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Desalination and Water Treatment, 2013

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Jurnal Teknologi, 2014

Sustainable office building indoor environment design is a challengeable issue for professionals ... more Sustainable office building indoor environment design is a challengeable issue for professionals in thermal comfort, satisfaction, health, and energy fields of research. The professionals intensively need a comprehensive list of office indoor environment design features to promote the level of performance and productivity of staff. One of the most effective factors dealing with staff performance and productivity is physical and psychological health which has not yet been investigated in depth is open-plan office design. In this regard, the current research aimed at establishing a comprehensive list of Open Plan Offices Design (OPOD) features affecting physical and psychological health and well-being of the staff at office buildings. Research methodology engaged two phases corresponding to two objectives. Phase one was to investigate OPOD features and sub-features through a critical literature review using fishbone cause-and-effect analysis technique. Phase one has clustered the OPOD...

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Jurnal Teknologi, 2014

Preliminary research shows the shortcoming of Building Performance field of research to measure o... more Preliminary research shows the shortcoming of Building Performance field of research to measure outdoor performance of building mainly EETP factors. Accordingly, this research aimed at proposing a future building performance towards Energy Efficient Travel Plan (EETP) based on user friendly EETP factors. The research methodology engaged three research phases. Phase 1 was to identify user friendly EETP factors. In this phase after a literature review, fix-format self reporting interview survey was conducted among experts in Travel Plan implementation in Malaysia. ‘Phase II’ was to investigate effective Building performance factors on user friendly EETP, within the literature review conducted on building performances followed by brainstorming with 5 experts in building management field of research. Final phase was to validate the proposed building performance towards EETP in a futuristic cross-impact scenario study. In summary, this research introduced three main outcomes, first: a li...

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Sadhana, 2014

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Advanced Science Letters, 2013

ABSTRACT The importance of enhancing group decision making and involving different professionals ... more ABSTRACT The importance of enhancing group decision making and involving different professionals in decision making process is obvious. The current research has been carried out to develop a integrative group decision-making method. It is to meet the requirement of integrative and consensus-value-based approach in group decision making. Literature review highlights the basic needs of integrative group decision making. In this regards, the research presents a new group decision making Model called ‘Grounded-Group Decision Making (GGDM)’ Model. It specifically considers decision makers' justification during a decision making process. The research addresses two objectives. First, it is to investigate the current body of knowledge in group decision making methods and, to extract constrains faced by previous researchers. Secondly, it is to develop a new multiple criteria group decision making method which considerably reduces constrains and shortcomings of existing methods and models. GGDM was developed based on four (4) investigated group decision making assumptions. To validate the GGDM model, a pilot study was conducted. Four consecutive rounds of close-group discussion with field professionals were held to validate a specific research proposal as the case study. In conclusion, GGDM model provided considerably more accurate, integrative, and consensus-value-based results, in comparison with, traditional methods of group decision making.

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Renewable and Sustainable Energy Reviews, 2014

ABSTRACT Many techniques for managing sustainability including sustainable building assessment to... more ABSTRACT Many techniques for managing sustainability including sustainable building assessment tools and standards have been developed globally. The sustainable building assessment tools measure the user satisfaction dependent to environmental and economic aspects of energy efficient building practices. However, these tools have not yet measure energy efficiency index by involving user satisfaction from adaptive behaviors dependently, which can determine the actual energy consumption versus the planed energy consumption of the building. Hence, this research aimed at providing a comprehensive list of adaptive behaviors for assessing energy efficient building indoor environment in design phase of building lifecycle. The study focused on identifying and establishing adaptive behaviors that are in response to indoor conditions provided by Cooling and Lighting systems in energy efficient office buildings. This research involves adaptations across Technological and Personal. The research was conducted in two phases. Phase one identified the list of user satisfaction adaptive behaviors through a systematic approach. Next, an expert input study was conducted to validate the findings of the literature review. Expert input data was collected using Delphi structured close group discussion method, and then analyzed through Grounded Group Decision Making (GGDM) method. Eight experts were involved in four sessions of the GGDM application procedure. The research established 18 adaptive behaviors relevant to cooling system in energy efficient indoor environments, and 18 adaptive behaviors relevant to the lighting system. The comprehensive list of user satisfaction adaptive behaviors can be applied in both current and future sustainable building assessment tools׳ energy efficiency indexes. This aids architects, engineers, facility managers, building owners, consultants, authorities, contractors, and academic researchers in accreditation of building users, building design and reduction of building׳s energy consumption.

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Background: Research on risk network analysis has not developed a simple method that is based on ... more Background: Research on risk network analysis has not developed a simple method that is based on the destructive network function of nodes. Objective: Hence, we propose loop destructive network analysis (LDNA), a method of identifying the most influential relation and node to break (destruct) a major number of loops. For this purpose, general connectivity is reduced with minimal effort. Case study: LDNA is applied in the connective network of construction corporate social responsibility (CSR) implementation risks. The process and result are showcased and discussed to deliver a clear understanding on LDNA. Significance: This method will aid the success of resource planning in systematic risk reduction.

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Background: From a stakeholder management perspective, construction plays a big role in applying ... more Background: From a stakeholder management perspective, construction plays a big role in applying mitigation or adaptation solutions to eliminate the societal risk of development projects. Construction neighbourhood is a basic construction stakeholder with major and direct effect on work progress. Generally, corporate social responsibility (CSR) is the main business approach employed to regulate such a risk. It is while construction CSR is not properly considered the neighbourhood to address the risk. Method: Using the structure of CSR elements in the literature as a basis, this study critically reviews and argues CSR direction. Findings: The argument is outlined observed issues on CSR role, objective, stakeholder, and activity setting as well as comprehensive integration and CSR direction, and highlighted that CSR directions should be reexamined. Significance: This work intends to shed light on the field to redirect the efforts for better construction CSR practices.

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Climate change is receiving increasing attention in recent years. The transportation sector contr... more Climate change is receiving increasing attention in recent years. The transportation sector contributes substantially to increased fuel consumption, greenhouse gas (GHG) emissions, and poor air quality, which imposes a serious respiratory health hazard. Road transport has made a significant contribution to this effect. Consequently, many countries have attempted to mitigate climate change using various strategies. This study analysed and compared the number of policies and other approaches necessary to achieve reduced fuel consumption and carbon emission. Frequency aggregation indicates that the mitigation policies associated with driving behaviours adopted to curtail this consumption and decrease hazardous emissions, as well as a safety enhancement. Furthermore, car-sharing/carpooling was the least investigated approach to establish its influence on mitigation of climate change. Additionally, the influence of such driving behaviours as acceleration/deceleration and the compliance to speed limits on each approach was discussed. Other driving behaviours, such as gear shifting, compliance to traffic laws, choice of route, and idling and braking style, were also discussed. Likewise, the influence of aggression, anxiety, and motivation on driving behaviour of motorists was highlighted. The research determined that driving behaviours can lead to new adaptive driving behaviours and, thus, cause a significant decrease of vehicle fuel consumption and CO 2 emissions.

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Transportation is the major contributor of ever-increasing CO 2 and Greenhouse Gas emissions in c... more Transportation is the major contributor of ever-increasing CO 2 and Greenhouse Gas emissions in cities. The ever-increasing hazardous emissions of transportation and energy consumption have persuaded transportation and urban planners to motivate people to non-motorized mode of travel, especially walking. Currently, there are several urban walkability assessment models; however, coping with a limited range of walkability assessment variables make these models not fully able to promote inclusive walkable urban neighborhoods. In this regard, this study develops the path walkability assessment (PWA) index model which evaluates and analyzes path walkability in association with the pedestrian's decision-tree-making (DTM). The model converts the pedestrian's DTM qualitative data to quantifiable values. This model involves ninety-two (92) physical and environmental walkability assessment variables clustered into three layers of DTM (Layer 1: features; Layer 2: Criteria; and Layer 3: Sub-Criteria), and scoped to shopping and retail type of walking. The PWA model as a global decision support tool can be applied in any neighborhood in the world, and this study implements it at Taman Universiti neighborhood in Skudai, Malaysia. The PWA model has established the walkability score index which determines the grading rate of walkability accomplishment for each walkability variable of the under-survey neighborhood. Using the PWA grading index enables urban designers to manage properly the financial resource allocation for inspiring walkability in the targeted neighborhood.

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Road transportation is the main energy consumer and major contributor of ever-increasing hazardou... more Road transportation is the main energy consumer and major contributor of ever-increasing hazardous emissions. Transportation professionals have raised the idea of applying the green concept in various areas of transportation, including green highways, green vehicles and transit-oriented designs, to tackle the negative impact of road transportation. This research generated a new dimension called the green driver to remediate urgently the existing driving assessment models that have intensified emissions and energy consumption. In this regard, this study aimed to establish the green driver's behaviors related to fuel saving and emission reduction. The study has two phases. Phase one involves investigating the driving behaviors influencing fuel saving and emission reduction through a systematic literature review and content analysis, which identified twenty-one variables classified into four clusters. These clusters included the following: (i) FE f1 , which is driving style; (ii) FE f2 , which is driving behavior associated with vehicle transmission; (iii) FE f3 , which is driving behavior associated with road design and traffic rules; and (iv) FE f4 , which is driving behavior associated with vehicle operational characteristics. The second phase involves validating phase one findings by applying the Grounded Group Decision Making (GGDM) method. The results of GGDM have established seventeen green driving behaviors. The study conducted the Green Value (GV) analysis for each green behavior on fuel saving and emission reduction. The study found that aggressive driving (GV = 0.16) interferes with the association between fuel consumption, emission and driver's personalities. The research concludes that driver's personalities (including physical, psychological and psychosocial characteristics) have to be integrated for advanced in-vehicle driver assistance system and particularly, for green driving accreditation.

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The existent research investigates the ability of Bacillus bacteria species to improve the streng... more The existent research investigates the ability of Bacillus bacteria species to improve the strength of Geo-polymer concrete based on bio-mineralization mechanism. The appropriate cell concentration of bacteria was introduced in ordinary and Geo-polymer concrete by way of the mixing water to compare their strength and durability. In this research, it was found that the compressive strength growth in Geo-polymer bacterial concrete was the highest in comparison to ordinary bacterial concrete at 90 th day. For durability study, the specimens were immersed in 5% H2SO4 solution and the result showed that Geo-polymer bacterial concrete had the least weight and strength losses than ordinary bacterial concrete at different ages. This improvement was due to the temperature condition of Geo-polymer bacterial concrete to survive more bacteria for purpose of calcite precipitation. The density and uniformity of concrete were also examined by ultrasonic pulse velocity (UPV) test. The result showed...

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Sustainability, 2018

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Sustainability, 2018

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Sustainability, 2017

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Desalination and Water Treatment, 2016

ABSTRACT Indigenous microalgae were isolated from agro-industrial wastewater in Johor, Malaysia a... more ABSTRACT Indigenous microalgae were isolated from agro-industrial wastewater in Johor, Malaysia and were screened for the greatest goal of mass cultivation in IPASA, UTM Skudai in order to determine their potential as biomass and biodiesel sources. Bold’s Basal Medium nutrient media recipes were used to isolate the largest number of colonies from each field sample. These nutrient instructions were altered in order to optimize the isolation and growth dynamics of particular colonies. The isolates were classified based on the morphological appearance of the culture and the microscopic cellular appearance of the isolated colonies. Isolates comprised several common green microalgae and cyanobacteria, in which one of the ideal candidates was nominated for further investigation. Lipid content was determined for particular strains that illustrated relatively quick growth. The results revealed that Chlamydomonas incerta achieved the highest lipid content of 42.6% of biomass after 2 days, as well as the highest lipid productivity of 0.197mg/L.d-1 when the initial COD concentration was 500 mg/L. C. incerta that showed the high growth rate, resistance to invasion, and contained adequate amount of lipid was examined for its potential as a sustainable biomass and biodiesel feedstock.

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Jurnal Teknologi, 2015

Risk management is one of the most essential and significant part of construction projects due to... more Risk management is one of the most essential and significant part of construction projects due to assuring the attainment of project goals. Because of increasing global energy, more attention is needed to be paid towards risk management in oil and gas companies. The aim of this study is to improve the implementation of risk management within contractor companies in the oil and gas construction project through the evaluation of the most import risk groups and the barriers of implementing risk management in this part of industry. The current study is carried out in Iran and the scope of study includes only the construction project in oil and gas companies. A total of 48 questionnaires were distributed to the respondents and only 35 were obtained duly answered. The data was analyzed using SPSS software during the preliminary stage of this study, a variety of risk groups have been studied, six of it were identified to be the most probable in oil and gas construction projects which inc...

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ABSTRACT Self-healing concretes are being widely recognized as a remedial technique to improve th... more ABSTRACT Self-healing concretes are being widely recognized as a remedial technique to improve the durability of concrete. Although, few review papers on self-healing concrete were published, a strong review on all aspects of self-healing concrete cannot be found. In this paper, natural, chemical and biological processes of self-healing concrete technologies were completely reviewed. The main focus of the study is for the biological processes. The review presents a new insight into the research for the treatment of unexpected cracking of concrete. The information presented in this paper can be considered significant for biotechnologists and bioprocess engineers to have comprehensive updates on the current status-quo of self-healing concrete.

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Biological self-healing concrete is a new idea to ha ve concrete structures with more durability.... more Biological self-healing concrete is a new idea to ha ve concrete structures with more durability. Althou gh, several papers have been published on biological self-healing conc rete, a suitable instruction to conduct this type o f studies is not reported. Aim of this paper is collecting comprehensive infor mation about conducting a study on self-healing con cretes based on previous studies. This paper present many new ideas that have not been completely study. Some idea suc h as application of fungi, thermopiles bacteria, mix culture of microor ganisms or using of aerobic or anaerobic bacteria t o design biological selfhealing concrete are suggested in this paper. Ideas of this paper can help researchers to find a suita ble and novel subject in biological self-healing area to conduct a strong re search.

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Desalination and Water Treatment, 2013

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Desalination and Water Treatment, 2013

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Jurnal Teknologi, 2014

Sustainable office building indoor environment design is a challengeable issue for professionals ... more Sustainable office building indoor environment design is a challengeable issue for professionals in thermal comfort, satisfaction, health, and energy fields of research. The professionals intensively need a comprehensive list of office indoor environment design features to promote the level of performance and productivity of staff. One of the most effective factors dealing with staff performance and productivity is physical and psychological health which has not yet been investigated in depth is open-plan office design. In this regard, the current research aimed at establishing a comprehensive list of Open Plan Offices Design (OPOD) features affecting physical and psychological health and well-being of the staff at office buildings. Research methodology engaged two phases corresponding to two objectives. Phase one was to investigate OPOD features and sub-features through a critical literature review using fishbone cause-and-effect analysis technique. Phase one has clustered the OPOD...

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Jurnal Teknologi, 2014

Preliminary research shows the shortcoming of Building Performance field of research to measure o... more Preliminary research shows the shortcoming of Building Performance field of research to measure outdoor performance of building mainly EETP factors. Accordingly, this research aimed at proposing a future building performance towards Energy Efficient Travel Plan (EETP) based on user friendly EETP factors. The research methodology engaged three research phases. Phase 1 was to identify user friendly EETP factors. In this phase after a literature review, fix-format self reporting interview survey was conducted among experts in Travel Plan implementation in Malaysia. ‘Phase II’ was to investigate effective Building performance factors on user friendly EETP, within the literature review conducted on building performances followed by brainstorming with 5 experts in building management field of research. Final phase was to validate the proposed building performance towards EETP in a futuristic cross-impact scenario study. In summary, this research introduced three main outcomes, first: a li...

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Sadhana, 2014

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Advanced Science Letters, 2013

ABSTRACT The importance of enhancing group decision making and involving different professionals ... more ABSTRACT The importance of enhancing group decision making and involving different professionals in decision making process is obvious. The current research has been carried out to develop a integrative group decision-making method. It is to meet the requirement of integrative and consensus-value-based approach in group decision making. Literature review highlights the basic needs of integrative group decision making. In this regards, the research presents a new group decision making Model called ‘Grounded-Group Decision Making (GGDM)’ Model. It specifically considers decision makers' justification during a decision making process. The research addresses two objectives. First, it is to investigate the current body of knowledge in group decision making methods and, to extract constrains faced by previous researchers. Secondly, it is to develop a new multiple criteria group decision making method which considerably reduces constrains and shortcomings of existing methods and models. GGDM was developed based on four (4) investigated group decision making assumptions. To validate the GGDM model, a pilot study was conducted. Four consecutive rounds of close-group discussion with field professionals were held to validate a specific research proposal as the case study. In conclusion, GGDM model provided considerably more accurate, integrative, and consensus-value-based results, in comparison with, traditional methods of group decision making.

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Renewable and Sustainable Energy Reviews, 2014

ABSTRACT Many techniques for managing sustainability including sustainable building assessment to... more ABSTRACT Many techniques for managing sustainability including sustainable building assessment tools and standards have been developed globally. The sustainable building assessment tools measure the user satisfaction dependent to environmental and economic aspects of energy efficient building practices. However, these tools have not yet measure energy efficiency index by involving user satisfaction from adaptive behaviors dependently, which can determine the actual energy consumption versus the planed energy consumption of the building. Hence, this research aimed at providing a comprehensive list of adaptive behaviors for assessing energy efficient building indoor environment in design phase of building lifecycle. The study focused on identifying and establishing adaptive behaviors that are in response to indoor conditions provided by Cooling and Lighting systems in energy efficient office buildings. This research involves adaptations across Technological and Personal. The research was conducted in two phases. Phase one identified the list of user satisfaction adaptive behaviors through a systematic approach. Next, an expert input study was conducted to validate the findings of the literature review. Expert input data was collected using Delphi structured close group discussion method, and then analyzed through Grounded Group Decision Making (GGDM) method. Eight experts were involved in four sessions of the GGDM application procedure. The research established 18 adaptive behaviors relevant to cooling system in energy efficient indoor environments, and 18 adaptive behaviors relevant to the lighting system. The comprehensive list of user satisfaction adaptive behaviors can be applied in both current and future sustainable building assessment tools׳ energy efficiency indexes. This aids architects, engineers, facility managers, building owners, consultants, authorities, contractors, and academic researchers in accreditation of building users, building design and reduction of building׳s energy consumption.

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Background: Research on risk network analysis has not developed a simple method that is based on ... more Background: Research on risk network analysis has not developed a simple method that is based on the destructive network function of nodes. Objective: Hence, we propose loop destructive network analysis (LDNA), a method of identifying the most influential relation and node to break (destruct) a major number of loops. For this purpose, general connectivity is reduced with minimal effort. Case study: LDNA is applied in the connective network of construction corporate social responsibility (CSR) implementation risks. The process and result are showcased and discussed to deliver a clear understanding on LDNA. Significance: This method will aid the success of resource planning in systematic risk reduction.

Bookmarks Related papers MentionsView impact

Background: From a stakeholder management perspective, construction plays a big role in applying ... more Background: From a stakeholder management perspective, construction plays a big role in applying mitigation or adaptation solutions to eliminate the societal risk of development projects. Construction neighbourhood is a basic construction stakeholder with major and direct effect on work progress. Generally, corporate social responsibility (CSR) is the main business approach employed to regulate such a risk. It is while construction CSR is not properly considered the neighbourhood to address the risk. Method: Using the structure of CSR elements in the literature as a basis, this study critically reviews and argues CSR direction. Findings: The argument is outlined observed issues on CSR role, objective, stakeholder, and activity setting as well as comprehensive integration and CSR direction, and highlighted that CSR directions should be reexamined. Significance: This work intends to shed light on the field to redirect the efforts for better construction CSR practices.

Bookmarks Related papers MentionsView impact

Climate change is receiving increasing attention in recent years. The transportation sector contr... more Climate change is receiving increasing attention in recent years. The transportation sector contributes substantially to increased fuel consumption, greenhouse gas (GHG) emissions, and poor air quality, which imposes a serious respiratory health hazard. Road transport has made a significant contribution to this effect. Consequently, many countries have attempted to mitigate climate change using various strategies. This study analysed and compared the number of policies and other approaches necessary to achieve reduced fuel consumption and carbon emission. Frequency aggregation indicates that the mitigation policies associated with driving behaviours adopted to curtail this consumption and decrease hazardous emissions, as well as a safety enhancement. Furthermore, car-sharing/carpooling was the least investigated approach to establish its influence on mitigation of climate change. Additionally, the influence of such driving behaviours as acceleration/deceleration and the compliance to speed limits on each approach was discussed. Other driving behaviours, such as gear shifting, compliance to traffic laws, choice of route, and idling and braking style, were also discussed. Likewise, the influence of aggression, anxiety, and motivation on driving behaviour of motorists was highlighted. The research determined that driving behaviours can lead to new adaptive driving behaviours and, thus, cause a significant decrease of vehicle fuel consumption and CO 2 emissions.

Bookmarks Related papers MentionsView impact

Transportation is the major contributor of ever-increasing CO 2 and Greenhouse Gas emissions in c... more Transportation is the major contributor of ever-increasing CO 2 and Greenhouse Gas emissions in cities. The ever-increasing hazardous emissions of transportation and energy consumption have persuaded transportation and urban planners to motivate people to non-motorized mode of travel, especially walking. Currently, there are several urban walkability assessment models; however, coping with a limited range of walkability assessment variables make these models not fully able to promote inclusive walkable urban neighborhoods. In this regard, this study develops the path walkability assessment (PWA) index model which evaluates and analyzes path walkability in association with the pedestrian's decision-tree-making (DTM). The model converts the pedestrian's DTM qualitative data to quantifiable values. This model involves ninety-two (92) physical and environmental walkability assessment variables clustered into three layers of DTM (Layer 1: features; Layer 2: Criteria; and Layer 3: Sub-Criteria), and scoped to shopping and retail type of walking. The PWA model as a global decision support tool can be applied in any neighborhood in the world, and this study implements it at Taman Universiti neighborhood in Skudai, Malaysia. The PWA model has established the walkability score index which determines the grading rate of walkability accomplishment for each walkability variable of the under-survey neighborhood. Using the PWA grading index enables urban designers to manage properly the financial resource allocation for inspiring walkability in the targeted neighborhood.

Bookmarks Related papers MentionsView impact

Road transportation is the main energy consumer and major contributor of ever-increasing hazardou... more Road transportation is the main energy consumer and major contributor of ever-increasing hazardous emissions. Transportation professionals have raised the idea of applying the green concept in various areas of transportation, including green highways, green vehicles and transit-oriented designs, to tackle the negative impact of road transportation. This research generated a new dimension called the green driver to remediate urgently the existing driving assessment models that have intensified emissions and energy consumption. In this regard, this study aimed to establish the green driver's behaviors related to fuel saving and emission reduction. The study has two phases. Phase one involves investigating the driving behaviors influencing fuel saving and emission reduction through a systematic literature review and content analysis, which identified twenty-one variables classified into four clusters. These clusters included the following: (i) FE f1 , which is driving style; (ii) FE f2 , which is driving behavior associated with vehicle transmission; (iii) FE f3 , which is driving behavior associated with road design and traffic rules; and (iv) FE f4 , which is driving behavior associated with vehicle operational characteristics. The second phase involves validating phase one findings by applying the Grounded Group Decision Making (GGDM) method. The results of GGDM have established seventeen green driving behaviors. The study conducted the Green Value (GV) analysis for each green behavior on fuel saving and emission reduction. The study found that aggressive driving (GV = 0.16) interferes with the association between fuel consumption, emission and driver's personalities. The research concludes that driver's personalities (including physical, psychological and psychosocial characteristics) have to be integrated for advanced in-vehicle driver assistance system and particularly, for green driving accreditation.

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