Jafri Rohani - Profile on Academia.edu (original) (raw)
Papers by Jafri Rohani
Application of Six Sigma DMAIC methodology in plain yogurt production process
International Journal of Lean Six Sigma, Jun 26, 2018
Purpose This study aims to concentrate on quality improvement in plain yogurt production process ... more Purpose This study aims to concentrate on quality improvement in plain yogurt production process at company A through adjusting the factors affecting the acidity of the yogurt and determining the optimal level of these factors. Design/methodology/approach Six Sigma-based framework using define-measure-analyze-improve-control (DMAIC) methodology is adopted through the application of design of experiments tool to focus on customer’s requirements to improve the quality characteristic of plain yogurt production process in dairy products manufacturing company (company A) in Iran. Findings The results showed that incubation time and fat percentage were significant factors on pH values of yogurt and the optimum settings for these factors were defined as 12 h for the incubation time and 1.5 per cent for the fat percentage. Research limitations/implications This study focused solely on the plain yogurt production process in dairy products manufacturing company. Practical implications Simplicity of Six Sigma plays a leading role for enabling any dairy manufacturer to determine the problem and minimize its cause through a systematic approach. Social implications Six Sigma has been considered to be a systematic, powerful technique to continuously improve the processes and develop the new products by using effective analytical and statistical tools and methods. This paper presents a Six Sigma-based framework using DMAIC methodology to improve the quality characteristic of plain yogurt production process in dairy products manufacturing company. Originality/value This study contributes to show a potential area in which Six Sigma DMAIC approach can promote to improve the quality of yogurt production process. This case can prompt managers of the company to apply Six Sigma method to address complicated problems in other processes, where causes particularly are not clear.
International journal of engineering & technology, Aug 10, 2018
Prolonged standing is one of the common activities in electronic industry as the task requirement... more Prolonged standing is one of the common activities in electronic industry as the task requirement. Prolonged standing can cause discomfort on the body of the workers and can lead to injury and occupational disease. The purpose of this study is to investigate standing workers perception on the fatigue and the discomfort on their respective body region for 12 hours working time. The subjects are the 80 workers with a good health condition and at least 6 months tenure. The subject data are collected via questionnaires and Likert scale to define the discomfort, pain, and fatigue. The workers were interviewed regarding their job and perceived fatigue discomfort. The results show the domination of the lower body region with the higher mean at the lower back, legs, and foot ankle. No statistically significant differences were found between the job tenure and body part discomfort pain and fatigue. There is a significant relation between gender and discomfort pain on legs and foot ankle. The result also shows a strong relation between age and the discomfort body parts of thigh and foot ankle. The perceptions of the workers towards discomfort pain and fatigue cause by prolonged standing during performing the task. The results from this study will provide a view for industrial consultants or ergonomist with evidence to support for ergonomic interventions for prolonged standing activity such as job rotation and work-rest schedule.
Jurnal Mekanikal, 2015
The purpose of this study is to analyze and compare two costing method, namely, Traditional Costi... more The purpose of this study is to analyze and compare two costing method, namely, Traditional Costing and Activity-based Costing (ABC) costing in a selected manufacturing company. ABC is better, more accurate way of allocating overhead cost. Several steps such as identify the cost object, identify the direct costs associated with the cost object, identify overhead costs, select the cost allocation base for assigning overhead costs to the cost object and develop the overhead rate per unit. A case study was conducted to compare the benefits, advantages and disadvantages of both costing method. Step by step calculation for both traditional and ABC method was analyzed by choosing three selected products from the case study. The products selected were based from low, medium and high range of its product value. The overhead cost performance for three products were determined using ABC costing and the results were compared with traditional costing method. It was discovered that ABC method is better and more accurate in term of overhead costs.
Procedia Manufacturing, 2015
Machining companies can implement sustainable manufacturing using steps to improving the performa... more Machining companies can implement sustainable manufacturing using steps to improving the performance of economic, environmental and social. One of the steps is to perform the efficiency of energy consumption (mainly electricity) in machining. This paper describes a case study which investigates the effect of cutting parameters on power consumption and surface roughness by applying design of experiments. Dry turning of treated Al-11%Si alloy using coated carbide tool at different cutting speed (70, 130 and 250 m/min) and feed (0.05, 0.10 and 0.15 mm) was investigated. The results showed an optimum effect of cutting parameters that was obtained at low feed rate and high cutting speed, as shown by the model solutions.
Characterization of a wave soldering process using Taguchi method
This paper outlines the Taguchi methodology as an approach to identify the" optimal" wa... more This paper outlines the Taguchi methodology as an approach to identify the" optimal" wave soldering machine parameter setting that has significant effect on a key quality characteristic of interest, namely, soldering defects per units (SDPU). The method is briefly discussed ...
Comparison of Different Scenarios Using Computer Simulation to Improve the Manufacturing System Productivity: Case Study
Advanced Materials Research, Dec 1, 2013
In the manufacturing industry, managers and engineers are seeking to find methods in order to eli... more In the manufacturing industry, managers and engineers are seeking to find methods in order to eliminate the common problems in manufacturing systems such as bottlenecks and waiting times. This is because that all of these kinds of problems impose extra cost to the companies. In addition, manufacturing companies are striving to sustain their competitiveness by improving productivity, efficiency and quality of manufacturing industry for instance high throughput and high resource utilization. The paper concentrates on the application of computer simulation to analysis manufacturing system in order to improve the productivity. Therefore, this study introduces a color manufacturing line as a case study and the basic application of arena 13.9 software. The goal of this paper is to improve the productivity and efficiency of the production line by using computer simulation. To achieve this goal, first the basic model of the current situation of production line was simulated. Second, three different alternatives were simulated and modified to find the best scenario based on the maximum productivity and minimum total cost.
Jurnal teknologi, Jan 20, 2012
In order to survive in a competitive market, improving quality and productivity of product or pro... more In order to survive in a competitive market, improving quality and productivity of product or process is a must for any company. Some simple techniques like the "seven basic quality control(QC) tools" provide a very valuable and cost effective way to meet these objectives. This paper presents a case study in which a local plastic injection moulding company deployed some part of the "seven basic quality control(QC) tools" to significantly improved the monthly defect quality from 13.49% to 7.4%. However, to make them successful as cost effective and problem solving tools, strong commitment from top management is required.
Applied Mechanics and Materials, Aug 1, 2014
TiO 2 nanoparticles (NPs) were synthesized by hydrothermal (HT) assisted sol-gel technique. The p... more TiO 2 nanoparticles (NPs) were synthesized by hydrothermal (HT) assisted sol-gel technique. The preparation parameters including pH value, the amount of water, titanium tetra isopropoxide (TTIP) content, temperature and time of HT hydrothermal process were investigated by Taguchi statistical experiments to determine the influence of synthesizing variables on the optimal conditions and to realize the highest degree of crystallinity (HDC) or smallest crystallite size (SCS). X-ray diffraction (XRD) analysis and direct band gap energy (E g ) values, measured via diffuse reflectance spectra (DRS), proved that HDC and SCS all the samples consist of anatase as a unique phase. Transmission electron microscopy (TEM) and specific surface areas (SSA) values showed that SCS the sample with the smallest crystallite size could exert more effective photoactivity confirmed by
Implementation of Lean Manufacturing Process to Reduce Waste: A Case Study
IOP conference series, Mar 1, 2021
Excessive waste production is often happening in the inefficient use of resources in manufacturin... more Excessive waste production is often happening in the inefficient use of resources in manufacturing. There is still some excessive waste found in the electronic components company as a case study. It resulted from the careless use of resources and indirectly weakness their market positioning. The purpose of this paper is to present an implementation of a lean manufacturing process to reduce waste. This study aims to analyze and reduce the waste that occurs using lean manufacturing approaches. The value stream mapping (VSM) and waste relationship matrix (WRM) were applied to describe and to analyze the production flow of waste. Then, a waste assessment questionnaire (WAQ) is used to determine the percentage of waste that occurs. Value Stream Analysis Tools (VALSAT) is used for complete mapping tools. Three methods are considered for determining the feasibility, namely, net present value, internal rate of return, and profitability index. Base on analysis, we choose on the 3rd largest waste to be improved. According to the data analysis, it is found that increasing the number of production machines, carrying out appropriate maintenance activities, increasing training and supervision, and adding work facilities are recommendations for the improved production process. The proposed guidance seems to help the company reduce the seven waste and increase unit production. It is expected that the production process will be more effective and efficient.
Risk estimation of construction activities of buildings
Nucleation and Atmospheric Aerosols, 2020
Building construction work is one of the most dangerous activities among all industries. These wo... more Building construction work is one of the most dangerous activities among all industries. These works are often associated with different types of risks, which if not eliminated or minimized during design stages would cause fatal accidents and severe injuries during the construction stages. Risk elimination or reduction cannot be achieved without recognizing hazards and assessing risk through evaluation techniques. Risk may not be directly quantifiable, and the presence of confounding variables, ongoing interventions and uncertainty makes generalization of findings to the overall population a suspect. It is difficult to measure risk because it often assumes ordinal scales and data related to it is scarce. This paper presents a risk estimation technique that evaluates risk and produce data that can be used in response decisions to aid risk elimination or reduction in building construction processes. The technique to be presented in this paper will be based on experts’ opinion and will depend on experts’ knowledge and working experience in the construction industry. The study will conduct a risk assessment survey where experts will be asked to assign risk values to 25 construction activities of five structural elements (footing and foundation, column, wall, beam and roof). The objective is to estimate unit safety risk for each activity and determine the overall risk of the project. A questionnaire with all five components and their corresponding construction activities was used to evaluate risk severity levels and time of exposure for each activity. Data collected was analysed with SPSS descriptive statistics and one-way ANOVA. The findings show that construction field personnel perceive roof, beam and foundation as the most risky design elements to construct. Also excavation, shuttering and anchoring/welding are the most risky activities in the construction process. No significant differences were found between the perceptions of the three groups of construction field personnel (engineers, superintendents and HSEs) regarding risk perception.
International journal of engineering & technology, Aug 10, 2018
This study aims to investigate the potential hazards and accidents that might occur at batik prin... more This study aims to investigate the potential hazards and accidents that might occur at batik printing PT. Batik Merak Manis and recommends practical solutions to enhance safety and health at the workplace. This research adopts Hazard Identification Risk Assessment (HIRA) and Hazard and Operability Studies (HAZOP) to perform risk identification and assessment in the workplace. There are 17 findings of potential hazards in the production areas of batik printing which can be categorized into five types of hazards including: workers attitude, work posture, work procedure, workstation, and physical work environment. Of the risk assessment, the obtained value of 34% in the category of extreme hazard, 24% hazard in the high and medium category respectively, and 18% lower hazard category. Proposed improvements are made based HAZOP analysis worksheet. The proposed practical solutions include improvements in work attitude, work posture, and physical work environment.
Journal of King Saud University: Engineering Sciences, Jul 1, 2018
This study focused solely on a paint manufacturing industry in Iran that will help managers to ef... more This study focused solely on a paint manufacturing industry in Iran that will help managers to effectively manage their enterprise. The goal of this paper is to integrate simulation modeling along with response surface methodology (RSM) and design of experiments (DOE) in order to analyze and improve the productivity in a selected continuous paint manufacturing industry. Computer simulation is developed to propose different scenarios as the inputs of DOE. Based on the final results, the optimum productivity was achieved at the point of 93.5, that is relevant to the number of labor (B) = 26 and failure time of lifter (C) = 56.01 min. Moreover, the other two factors, A (service rate of delpak mixer) and D (number of permil) should be located at a low level. Quality and production managers, engineers as well as academicians can implement the results of the current study in other case studies. This approach can be generalized to other manufacturing systems to improve their productivity in a timely and cost-effective manner.
Modelling and Control Analysis of Bamboo-based Gasification: Towards the Modern Renewable Energy
DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2021
Asian Journal of Engineering and Technology, Jun 15, 2014
Keywords ---Driving hazard, driver's distraction, driving risk, fatigue and bus accident.
This paper presents discussion on bus accident data for period of 2003 -2012 retrieved from Malay... more This paper presents discussion on bus accident data for period of 2003 -2012 retrieved from Malaysian Institute of Road Safety (MIROS). A statistical analysis was conducted to gain insight into the trend, factors affecting accident occurrence and severity of commercial buses. 47% of cases investigated by MIROS between 2007 and 2010 resulted in fatalities, with fatality rate of 1-3 persons being the most frequent while accident with minor injuries having at least 22%. Understanding these factors can help to bring forth realistic strategies to improve the safety of these bus services. Express and stage buses have the highest rate of accident and causalities by road. Express roads record more accident compared to other categories of road. The major cause of mechanical failure among all types of buses was identified to be brake failure with about 56% of the total mechanical failure, and about 52% of all commercial buses were involved in traffic accident with a yearly means of 3.8 accidents per commercial bus (based on commercial bus involved in accident). This knowledge is useful for stake holders and policy makers in transportation industries to improve road safety and reduce accidents.
Control Analysis of Biomass Gasification with Combined Heat and Power System
Lecture notes in mechanical engineering, Sep 22, 2022
Knowledge, attitude and practice of MSD injuries from Malaysian employer perspective
This study aims to assess the level of Knowledge, Attitude and Practices (KAP) on Musculoskeletal... more This study aims to assess the level of Knowledge, Attitude and Practices (KAP) on Musculoskeletal disorders (MSDs) from employer perspectives in Malaysia industries. A newly developed KAP questionnaire was distributed and answered by 45 employers. Most employers show good scores to the majority of items in Knowledge, Attitude and Practices sections. Pearson correlation is used in order to test the relationship between KAP scores and demographic profile and also KAP variables. It was found that knowledge has strong correlation r=0.291, p>0.05 with gender. The attitude component has a strong correlation (r=0.344, p>0.05) with age group. Whereas the practices component has good correlation with education level (r=0.249, p>0.05). However, the KAP variables show only knowledge and practices have a strong correlation(r=0.271, p>0.05).MSDs cases are increasing hence understanding the underlying KAP factors are crucial in order to tackle the problem.
The development and analysis of quality control adjustment schemes for process regulation
Jurnal teknologi, Dec 20, 2015
To understand the risk of slipping accidents in the industry, it is imperative to measure the coe... more To understand the risk of slipping accidents in the industry, it is imperative to measure the coefficient of friction (COF) between footwear and floor. In this study, COF values were measured for four types of floor with five surface conditions that represent dry conditions and four liquid spillage conditions. A portable skid-resistance tester was used to measure the COF with three footwear materials attached on the slider. The results show that the interaction between floor type, footwear material, and surface conditions was significant (p< 0.0001). Variation of COF value was found due to different footwear materials and floors involved during the interaction. The friction loss results also conclude that the COF became reduced significantly in all footwear-floor conditions (in the range of 17% to 78%) in the presence of spillage on the floor.
Feasibility Study on Biomass Bamboo Renewable Energy in Malaysia, Indonesia, Vietnam and Japan
DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2021
Application of Six Sigma DMAIC methodology in plain yogurt production process
International Journal of Lean Six Sigma, Jun 26, 2018
Purpose This study aims to concentrate on quality improvement in plain yogurt production process ... more Purpose This study aims to concentrate on quality improvement in plain yogurt production process at company A through adjusting the factors affecting the acidity of the yogurt and determining the optimal level of these factors. Design/methodology/approach Six Sigma-based framework using define-measure-analyze-improve-control (DMAIC) methodology is adopted through the application of design of experiments tool to focus on customer’s requirements to improve the quality characteristic of plain yogurt production process in dairy products manufacturing company (company A) in Iran. Findings The results showed that incubation time and fat percentage were significant factors on pH values of yogurt and the optimum settings for these factors were defined as 12 h for the incubation time and 1.5 per cent for the fat percentage. Research limitations/implications This study focused solely on the plain yogurt production process in dairy products manufacturing company. Practical implications Simplicity of Six Sigma plays a leading role for enabling any dairy manufacturer to determine the problem and minimize its cause through a systematic approach. Social implications Six Sigma has been considered to be a systematic, powerful technique to continuously improve the processes and develop the new products by using effective analytical and statistical tools and methods. This paper presents a Six Sigma-based framework using DMAIC methodology to improve the quality characteristic of plain yogurt production process in dairy products manufacturing company. Originality/value This study contributes to show a potential area in which Six Sigma DMAIC approach can promote to improve the quality of yogurt production process. This case can prompt managers of the company to apply Six Sigma method to address complicated problems in other processes, where causes particularly are not clear.
International journal of engineering & technology, Aug 10, 2018
Prolonged standing is one of the common activities in electronic industry as the task requirement... more Prolonged standing is one of the common activities in electronic industry as the task requirement. Prolonged standing can cause discomfort on the body of the workers and can lead to injury and occupational disease. The purpose of this study is to investigate standing workers perception on the fatigue and the discomfort on their respective body region for 12 hours working time. The subjects are the 80 workers with a good health condition and at least 6 months tenure. The subject data are collected via questionnaires and Likert scale to define the discomfort, pain, and fatigue. The workers were interviewed regarding their job and perceived fatigue discomfort. The results show the domination of the lower body region with the higher mean at the lower back, legs, and foot ankle. No statistically significant differences were found between the job tenure and body part discomfort pain and fatigue. There is a significant relation between gender and discomfort pain on legs and foot ankle. The result also shows a strong relation between age and the discomfort body parts of thigh and foot ankle. The perceptions of the workers towards discomfort pain and fatigue cause by prolonged standing during performing the task. The results from this study will provide a view for industrial consultants or ergonomist with evidence to support for ergonomic interventions for prolonged standing activity such as job rotation and work-rest schedule.
Jurnal Mekanikal, 2015
The purpose of this study is to analyze and compare two costing method, namely, Traditional Costi... more The purpose of this study is to analyze and compare two costing method, namely, Traditional Costing and Activity-based Costing (ABC) costing in a selected manufacturing company. ABC is better, more accurate way of allocating overhead cost. Several steps such as identify the cost object, identify the direct costs associated with the cost object, identify overhead costs, select the cost allocation base for assigning overhead costs to the cost object and develop the overhead rate per unit. A case study was conducted to compare the benefits, advantages and disadvantages of both costing method. Step by step calculation for both traditional and ABC method was analyzed by choosing three selected products from the case study. The products selected were based from low, medium and high range of its product value. The overhead cost performance for three products were determined using ABC costing and the results were compared with traditional costing method. It was discovered that ABC method is better and more accurate in term of overhead costs.
Procedia Manufacturing, 2015
Machining companies can implement sustainable manufacturing using steps to improving the performa... more Machining companies can implement sustainable manufacturing using steps to improving the performance of economic, environmental and social. One of the steps is to perform the efficiency of energy consumption (mainly electricity) in machining. This paper describes a case study which investigates the effect of cutting parameters on power consumption and surface roughness by applying design of experiments. Dry turning of treated Al-11%Si alloy using coated carbide tool at different cutting speed (70, 130 and 250 m/min) and feed (0.05, 0.10 and 0.15 mm) was investigated. The results showed an optimum effect of cutting parameters that was obtained at low feed rate and high cutting speed, as shown by the model solutions.
Characterization of a wave soldering process using Taguchi method
This paper outlines the Taguchi methodology as an approach to identify the" optimal" wa... more This paper outlines the Taguchi methodology as an approach to identify the" optimal" wave soldering machine parameter setting that has significant effect on a key quality characteristic of interest, namely, soldering defects per units (SDPU). The method is briefly discussed ...
Comparison of Different Scenarios Using Computer Simulation to Improve the Manufacturing System Productivity: Case Study
Advanced Materials Research, Dec 1, 2013
In the manufacturing industry, managers and engineers are seeking to find methods in order to eli... more In the manufacturing industry, managers and engineers are seeking to find methods in order to eliminate the common problems in manufacturing systems such as bottlenecks and waiting times. This is because that all of these kinds of problems impose extra cost to the companies. In addition, manufacturing companies are striving to sustain their competitiveness by improving productivity, efficiency and quality of manufacturing industry for instance high throughput and high resource utilization. The paper concentrates on the application of computer simulation to analysis manufacturing system in order to improve the productivity. Therefore, this study introduces a color manufacturing line as a case study and the basic application of arena 13.9 software. The goal of this paper is to improve the productivity and efficiency of the production line by using computer simulation. To achieve this goal, first the basic model of the current situation of production line was simulated. Second, three different alternatives were simulated and modified to find the best scenario based on the maximum productivity and minimum total cost.
Jurnal teknologi, Jan 20, 2012
In order to survive in a competitive market, improving quality and productivity of product or pro... more In order to survive in a competitive market, improving quality and productivity of product or process is a must for any company. Some simple techniques like the "seven basic quality control(QC) tools" provide a very valuable and cost effective way to meet these objectives. This paper presents a case study in which a local plastic injection moulding company deployed some part of the "seven basic quality control(QC) tools" to significantly improved the monthly defect quality from 13.49% to 7.4%. However, to make them successful as cost effective and problem solving tools, strong commitment from top management is required.
Applied Mechanics and Materials, Aug 1, 2014
TiO 2 nanoparticles (NPs) were synthesized by hydrothermal (HT) assisted sol-gel technique. The p... more TiO 2 nanoparticles (NPs) were synthesized by hydrothermal (HT) assisted sol-gel technique. The preparation parameters including pH value, the amount of water, titanium tetra isopropoxide (TTIP) content, temperature and time of HT hydrothermal process were investigated by Taguchi statistical experiments to determine the influence of synthesizing variables on the optimal conditions and to realize the highest degree of crystallinity (HDC) or smallest crystallite size (SCS). X-ray diffraction (XRD) analysis and direct band gap energy (E g ) values, measured via diffuse reflectance spectra (DRS), proved that HDC and SCS all the samples consist of anatase as a unique phase. Transmission electron microscopy (TEM) and specific surface areas (SSA) values showed that SCS the sample with the smallest crystallite size could exert more effective photoactivity confirmed by
Implementation of Lean Manufacturing Process to Reduce Waste: A Case Study
IOP conference series, Mar 1, 2021
Excessive waste production is often happening in the inefficient use of resources in manufacturin... more Excessive waste production is often happening in the inefficient use of resources in manufacturing. There is still some excessive waste found in the electronic components company as a case study. It resulted from the careless use of resources and indirectly weakness their market positioning. The purpose of this paper is to present an implementation of a lean manufacturing process to reduce waste. This study aims to analyze and reduce the waste that occurs using lean manufacturing approaches. The value stream mapping (VSM) and waste relationship matrix (WRM) were applied to describe and to analyze the production flow of waste. Then, a waste assessment questionnaire (WAQ) is used to determine the percentage of waste that occurs. Value Stream Analysis Tools (VALSAT) is used for complete mapping tools. Three methods are considered for determining the feasibility, namely, net present value, internal rate of return, and profitability index. Base on analysis, we choose on the 3rd largest waste to be improved. According to the data analysis, it is found that increasing the number of production machines, carrying out appropriate maintenance activities, increasing training and supervision, and adding work facilities are recommendations for the improved production process. The proposed guidance seems to help the company reduce the seven waste and increase unit production. It is expected that the production process will be more effective and efficient.
Risk estimation of construction activities of buildings
Nucleation and Atmospheric Aerosols, 2020
Building construction work is one of the most dangerous activities among all industries. These wo... more Building construction work is one of the most dangerous activities among all industries. These works are often associated with different types of risks, which if not eliminated or minimized during design stages would cause fatal accidents and severe injuries during the construction stages. Risk elimination or reduction cannot be achieved without recognizing hazards and assessing risk through evaluation techniques. Risk may not be directly quantifiable, and the presence of confounding variables, ongoing interventions and uncertainty makes generalization of findings to the overall population a suspect. It is difficult to measure risk because it often assumes ordinal scales and data related to it is scarce. This paper presents a risk estimation technique that evaluates risk and produce data that can be used in response decisions to aid risk elimination or reduction in building construction processes. The technique to be presented in this paper will be based on experts’ opinion and will depend on experts’ knowledge and working experience in the construction industry. The study will conduct a risk assessment survey where experts will be asked to assign risk values to 25 construction activities of five structural elements (footing and foundation, column, wall, beam and roof). The objective is to estimate unit safety risk for each activity and determine the overall risk of the project. A questionnaire with all five components and their corresponding construction activities was used to evaluate risk severity levels and time of exposure for each activity. Data collected was analysed with SPSS descriptive statistics and one-way ANOVA. The findings show that construction field personnel perceive roof, beam and foundation as the most risky design elements to construct. Also excavation, shuttering and anchoring/welding are the most risky activities in the construction process. No significant differences were found between the perceptions of the three groups of construction field personnel (engineers, superintendents and HSEs) regarding risk perception.
International journal of engineering & technology, Aug 10, 2018
This study aims to investigate the potential hazards and accidents that might occur at batik prin... more This study aims to investigate the potential hazards and accidents that might occur at batik printing PT. Batik Merak Manis and recommends practical solutions to enhance safety and health at the workplace. This research adopts Hazard Identification Risk Assessment (HIRA) and Hazard and Operability Studies (HAZOP) to perform risk identification and assessment in the workplace. There are 17 findings of potential hazards in the production areas of batik printing which can be categorized into five types of hazards including: workers attitude, work posture, work procedure, workstation, and physical work environment. Of the risk assessment, the obtained value of 34% in the category of extreme hazard, 24% hazard in the high and medium category respectively, and 18% lower hazard category. Proposed improvements are made based HAZOP analysis worksheet. The proposed practical solutions include improvements in work attitude, work posture, and physical work environment.
Journal of King Saud University: Engineering Sciences, Jul 1, 2018
This study focused solely on a paint manufacturing industry in Iran that will help managers to ef... more This study focused solely on a paint manufacturing industry in Iran that will help managers to effectively manage their enterprise. The goal of this paper is to integrate simulation modeling along with response surface methodology (RSM) and design of experiments (DOE) in order to analyze and improve the productivity in a selected continuous paint manufacturing industry. Computer simulation is developed to propose different scenarios as the inputs of DOE. Based on the final results, the optimum productivity was achieved at the point of 93.5, that is relevant to the number of labor (B) = 26 and failure time of lifter (C) = 56.01 min. Moreover, the other two factors, A (service rate of delpak mixer) and D (number of permil) should be located at a low level. Quality and production managers, engineers as well as academicians can implement the results of the current study in other case studies. This approach can be generalized to other manufacturing systems to improve their productivity in a timely and cost-effective manner.
Modelling and Control Analysis of Bamboo-based Gasification: Towards the Modern Renewable Energy
DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2021
Asian Journal of Engineering and Technology, Jun 15, 2014
Keywords ---Driving hazard, driver's distraction, driving risk, fatigue and bus accident.
This paper presents discussion on bus accident data for period of 2003 -2012 retrieved from Malay... more This paper presents discussion on bus accident data for period of 2003 -2012 retrieved from Malaysian Institute of Road Safety (MIROS). A statistical analysis was conducted to gain insight into the trend, factors affecting accident occurrence and severity of commercial buses. 47% of cases investigated by MIROS between 2007 and 2010 resulted in fatalities, with fatality rate of 1-3 persons being the most frequent while accident with minor injuries having at least 22%. Understanding these factors can help to bring forth realistic strategies to improve the safety of these bus services. Express and stage buses have the highest rate of accident and causalities by road. Express roads record more accident compared to other categories of road. The major cause of mechanical failure among all types of buses was identified to be brake failure with about 56% of the total mechanical failure, and about 52% of all commercial buses were involved in traffic accident with a yearly means of 3.8 accidents per commercial bus (based on commercial bus involved in accident). This knowledge is useful for stake holders and policy makers in transportation industries to improve road safety and reduce accidents.
Control Analysis of Biomass Gasification with Combined Heat and Power System
Lecture notes in mechanical engineering, Sep 22, 2022
Knowledge, attitude and practice of MSD injuries from Malaysian employer perspective
This study aims to assess the level of Knowledge, Attitude and Practices (KAP) on Musculoskeletal... more This study aims to assess the level of Knowledge, Attitude and Practices (KAP) on Musculoskeletal disorders (MSDs) from employer perspectives in Malaysia industries. A newly developed KAP questionnaire was distributed and answered by 45 employers. Most employers show good scores to the majority of items in Knowledge, Attitude and Practices sections. Pearson correlation is used in order to test the relationship between KAP scores and demographic profile and also KAP variables. It was found that knowledge has strong correlation r=0.291, p>0.05 with gender. The attitude component has a strong correlation (r=0.344, p>0.05) with age group. Whereas the practices component has good correlation with education level (r=0.249, p>0.05). However, the KAP variables show only knowledge and practices have a strong correlation(r=0.271, p>0.05).MSDs cases are increasing hence understanding the underlying KAP factors are crucial in order to tackle the problem.
The development and analysis of quality control adjustment schemes for process regulation
Jurnal teknologi, Dec 20, 2015
To understand the risk of slipping accidents in the industry, it is imperative to measure the coe... more To understand the risk of slipping accidents in the industry, it is imperative to measure the coefficient of friction (COF) between footwear and floor. In this study, COF values were measured for four types of floor with five surface conditions that represent dry conditions and four liquid spillage conditions. A portable skid-resistance tester was used to measure the COF with three footwear materials attached on the slider. The results show that the interaction between floor type, footwear material, and surface conditions was significant (p< 0.0001). Variation of COF value was found due to different footwear materials and floors involved during the interaction. The friction loss results also conclude that the COF became reduced significantly in all footwear-floor conditions (in the range of 17% to 78%) in the presence of spillage on the floor.
Feasibility Study on Biomass Bamboo Renewable Energy in Malaysia, Indonesia, Vietnam and Japan
DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2021