icmrp13

MI-BEST Proceedings

 

 

 

Copyright © Global Illuminators. All rights reserved

MI-BEST Proceeding
Volume 4, Pages 1-205
2018 MI-BEST Conference on “MULTIDISCIPLINARY INNOVATION IN BUSINESS ENGINEERING SCIENCE & TECHNOLOGY” (MI-BEST 2018)
April 05-06, 2018 Bangkok, Thailand
Edited by Dr. Ahmed Saddam

 

Volume 1
pp. 1-200 (2015)
2015 MI-BEST Conference on “MULTIDISCIPLINARY INNOVATION IN BUSINESS ENGINEERING SCIENCE & TECHNOLOGY” (MI-BEST 2015)
Volume 2
pp. 1-68 (2016)
2016 MI-BEST Conference on “MULTIDISCIPLINARY INNOVATION IN BUSINESS ENGINEERING SCIENCE & TECHNOLOGY” (MI-BEST 2016)
Volume 3
pp. 1-59 (2017)
2017 MI-BEST Conference on “MULTIDISCIPLINARY INNOVATION IN BUSINESS ENGINEERING SCIENCE & TECHNOLOGY” (MI-BEST 2017)
Volume 4
pp. 1-205 (2018)
2018 MI-BEST Conference on “MULTIDISCIPLINARY INNOVATION IN BUSINESS ENGINEERING SCIENCE & TECHNOLOGY” (MI-BEST 2018)

adobe-pdf-icon
Preface of proceeding


Track: Business Management & Economic Studies

Quality of Work Life of Food Chain Employees in Region XI: A Causal Model

2

Pages 1-17
Lywylyn Santamarina Mendoza, Gloria P. Gempes

Abstract
The study was conducted with the following objectives: to identify the level of cultural value orientation, organizational commitment, personality dimension and quality of work life; to determine the significant relationship between the exogenous cultural value orientation, organizational commitment and personality dimension to the endogenous quality of work life; to determine the influence of the exogenous variables towards the endogenous quality of work life; and to recognize the best fit model that predicts quality of work life. Quantitative research design was employed in this study specifically the causal comparative. The study was conducted in the Davao Region, which was participated by 412 respondents. Primary data was utilized in gathering information. The survey questionnaire utilized in the study were sourced from various related researches. The data gathered was subjected to analysis and interpretation using the fundamental statistical tools, Pearson Product Moment Correlation, multiple regression and structural equation modelling (SEM). Findings of the study revealed that quality of work life, cultural value orientation, organizational commitment and personality dimension is high which means that it is oftentimes observed by the respondents. Cultural value orientation, organizational commitment and personality dimension has a significant relationship to quality of work life. Moreover, overall regression results shows that cultural value orientation, organizational commitment and personality dimension has a significant influence on quality of work life. Furthermore, there is a best fit model that predicts quality of work life of food chain employees in Region Xl. This study may be utilized by food chain companies specifically the human resource department in instigating programs and activities that will boost the desire of employees to stay in the organization.

The Mediating Effect of Risk Management Strategies on the Relationship between Attitude Constructs and Sustainability of Banana Production in Southern Philippines

2

Pages 18-26
Edren M. Panti, Gloria P. Gempes

Abstract

This study determined the mediating effect of risk management practices on the relationship between attitude of farmers and sustainability of banana production in Southern Philippines particularly on direct provincial players which include Davao Region, Bukidnon, Digos, North Cotabato, and ARMM area. The research design used in this study was the descriptive-correlation that involved 400 banana growers as respondents. The purposive random sampling technique was done in selecting the respondents. Sets of adapted survey questionnaires were used in obtaining data from the respondents which were subjected for content validity and reliability analysis. The data were analyzed using the Mean, Pearson-r, Multiple Regression Analysis, and Medgraph using Sobel z-test. The results revealed that the levels of attitude constructs, sustainable production, and risk management strategies of banana growers are evident most of the time. Moreover, significant relationship existed between these variables. A significant partial mediation of risk management strategies on the relationship between attitude and sustainable production of farmers in Southern Mindanao was proven in the study. Moreover, the results of the study may contribute to a more comprehensive problem structuring and theory development in confronting the issues in sustainable agriculture.


The Moderating Effect of Intellectual Capital on the Relationship between Corporate Reputation and Knowledge Sharing of Commercial Banks

2

Pages 27-36
Romel C. Nemiño, Gloria P. Gempes

Abstract

The ultimate aim of this study is to determine the moderating effect of intellectual capital on the relationship between corporate reputation and knowledge sharing of commercial banks in Caraga Region, Philippines. Its objectives are to determine the levels of corporate reputation, knowledge sharing and intellectual capital. Also, correlations between corporate reputation on knowledge sharing and intellectual capital on knowledge sharing were also studied. Adapted survey questionnaires were given to a sample of 400 bank employees of various commercial banks in the region using stratified sampling technique. Results uncovered that the three constructs have very high level as perceived by the bank personnel. Findings revealed that corporate reputation is significantly related to knowledge sharing. Intellectual capital also showed a significant positive relationship towards knowledge sharing. To determine the moderating effect of intellectual capital, a logistic hierarchical regression was employed in this study. Results revealed that intellectual capital demonstrates a significant moderating effect on the relationship between corporate reputation and knowledge sharing. Employees who have higher intellectual capital have also higher level of corporate reputation towards knowledge sharing. Having said this, the proposed research model in this study may be considered by the business enterprises, in general, by revisiting their current platforms and policy formulations and reviews on corporate reputation towards knowledge sharing with the complementary effect of intellectual capital. With these three constructs as support system, superior performance and competitiveness among commercial banks and other business organizations may be expected. With the growing economic activities nowadays especially that ASEAN development is already taking place in the ASEAN member countries where Philippines is a member of, commercial banks have to sustain its competitive position amidst the challenging competition in the banking industry.


A Path Analysis of Customer Loyalty of Homegrown Coffee Shops in Davao Region

2

Pages 37-42
Hinlayagan, Kymwell Recamadas

Abstract

The main purpose of the study is to determine the factors that lead to customer loyalty of homegrown coffee shops. This study was also conducted to investigate the relationship of marketing mix, customer expectation, customer experience, customer satisfaction and customer loyalty among homegrown coffee shops. Descriptive correlational design was utilized in this study. The data were obtained from the 580 homegrown coffee shop customers in Davao Region, Philippines. Sets of questionnaires were used as instruments. Pearson product moment correlation was used to determine the interrelationships between the marketing mix, customer expectation, customer experience, and customer satisfaction to customer loyalty. Multiple linear regression was performed to determine the significant predictor of customer loyalty. Path analysis was utilized in order to analyze the path relationships among the variables. The findings of the study revealed that the level of marketing mix, the level of customer expectation, the level of customer experience, the level of customer satisfaction, and the level of customer loyalty as perceived by the customers of homegrown coffee shops were all rated high. Moreover, marketing mix, customer expectation, customer experience, and customer satisfaction were highly correlated to customer loyalty. Meanwhile, all exogenous variables have significant direct influence to customer loyalty. Furthermore, the final model passed all the goodness of fit indices criteria.


A Structural Model of Millennial Tourist Behavior towards Tourism in Davao Region

2

Pages 43-49
Hazel Princess M. Rebollo

Abstract

This study was conducted to theoretically develop and empirically test to explore the best fit model of millennial tourist behavior towards tourism in Davao Region, Philippines. Structural equation was utilized in this study to test the casual relationships between variables. A total of 553 survey questionnaires were collected from selected millennial in Davao Region. The data were obtained at the pre-departure area of Davao City Airport. Descriptive statistics, Pearson R, Stepwise Regression and Goodness of Fit Test were used to analyze the data. The results revealed that tourist attitude, tourist motivation, social media, tourist visit intention and tourist behavior were all rated as moderately high. Furthermore, tourist attitude, tourist motivation, social media and tourist visit intention were highly correlated to tourist behavior. Meanwhile, tourist visit intention and tourist attitude were the best predictor of tourist behavior while tourist motivation and social media were the least predictor. Furthermore, the final model passed all the goodness of the fit indices criteria. The implication of these findings can be applied to the enhancement of tourism destination competitiveness.


Organizational Values, Interpersonal Skills, and Community Image: Basis for an Enhanced School Improvement Plan

2

Pages 50-59
Margie R. Nuñez, Sylvia J. Pidor

Abstract

This study aimed to determine how significant the influences are of the organizational values and interpersonal skills on the public image of school heads in Region XI. The respondents were the 775 public secondary school teachers who were chosen through purposive sampling. This study used the descriptive correlation approach. The researcher used the mean, Pearson r and multiple regression as statistical tools. A modified research instrument was developed, validated, and pilot tested. Findings revealed that the organizational values and interpersonal skills were rated high levels. These results implied that the organizational values were observed in most occasions, while the interpersonal skills of the school heads were often manifested. Further, there was also a high level of public image of the public secondary school heads. This showed that the school heads met the expectations oftentime. Moreover, the organizational values and interpersonal skills jointly influenced the community image of school heads. Both the organizational values and interpersonal skills showed significant influences on community image. Further, the combined influence of organizational values and interpersonal skills was significant. This result implied that the community image of the secondary school heads was affected by their organizational values and interpersonal skills.


Bank Service of Switching Traditional Web Platform to Mobile APP Platform

2

Pages 60-69
Shui-Lien Chen1, Sheng Chen Ke

Abstract

Mobile application, or “mobile apps”, are transforming the consumer behavior. In this new environment, “unless conventional merchants adopt an entirely new perspective omnichannel experience- they are likely to swept away (Rigby, 2011). A recent study finds that Apple IOS users had average of 48 apps, while Android users had, on average, only 35 (Nielenwire, 2011). Moreover, another study indicates IOS users average 105.3 minutes each month using mobile commerce apps, while Android users averaged only 87.6 minutes (Arbitron, 2013). This study aims to examine the influential factors of Performance expectancy, Effort expectancy, Social influence, Facilitating conditions of UTAUT theory, and Information quality, System quality, Service quality of design quality on mobile application. This research used survey technique to collect the data from 300 respondents who used mobile banking application. Multiple Linear Regression were statistical design. The researchers found Performance expectancy, Facilitating conditions, Information quality, Service quality, was influenced on consumer’s usage intention


Bank Service of Switching Traditional Web Platform to Mobile APP Platform

2

Pages 60-69
Shui-Lien Chen1, Sheng Chen Ke

Abstract

Mobile application, or “mobile apps”, are transforming the consumer behavior. In this new environment, “unless conventional merchants adopt an entirely new perspective omnichannel experience- they are likely to swept away (Rigby, 2011). A recent study finds that Apple IOS users had average of 48 apps, while Android users had, on average, only 35 (Nielenwire, 2011). Moreover, another study indicates IOS users average 105.3 minutes each month using mobile commerce apps, while Android users averaged only 87.6 minutes (Arbitron, 2013). This study aims to examine the influential factors of Performance expectancy, Effort expectancy, Social influence, Facilitating conditions of UTAUT theory, and Information quality, System quality, Service quality of design quality on mobile application. This research used survey technique to collect the data from 300 respondents who used mobile banking application. Multiple Linear Regression were statistical design. The researchers found Performance expectancy, Facilitating conditions, Information quality, Service quality, was influenced on consumer’s usage intention


Business Managament Control and Risk of the Cost Cutting Function in Shipping

2

Pages 70-77
Ratko Božić, Sandro Božić, Frane Mitrović

Abstract

In real business management of shipping companies, the managers often use various models to select tracing control and methods for risk management which are inevitable in maritime activities. Due to tracing such data it is easily to analyze the risks that are present in maritime markets. Therefore, modern business imposes indispensability of acknowledging the risk factor and there is no business activity that is not under the influence of risk. Thus, the obligation of business people is to take care of that and to learn how to manage the risk. Research work on the risk problem area in shipping industry is a subject of interest for many scientists and experts. However, a single systematic approach to the problem is missing. Our economic organizations usually do not have the right methodology by which risk of running business is estimated, nor do they have manager approach to the problem of its management. Only banking, where management developed very good methods of risk measuring, and which manages risk very successfully, can be excluded from that assessment. Risk management is not a new discipline. However, shipping agencies have to broaden their understanding of the risk management, to understand that risk can also be a business initiator. When a risk is managed strategically, the organization can balance its exposure to the risk and have more security in accepting risks, which are necessary for creating new products, services, business models and new ways of competing on the world market. The project and its risks are directly connected with project aims: the more ready shipping company is to take over the risks in the project, the more business benefit will they have. On the other hand, a shipping company which plays safe will lower its possible benefits. The risk should not be afraid of because most of them can be managed.


Track: Social Science & Humanities

Untold Stories of Teachers with Multiple Ancillary Functions: A Phenomenology of Fortitude

2

Pages 78-87
Into, Cherry Ann D, Gempes, Gloria P

Abstract
The purpose of this study was to describe the experiences of teachers in Davao City, Philippines with multiple ancillary functions. Employing phenomenological approach among 18 teachers respondents, in-depth interview and focus group discussion were conducted. Results revealed that most of the participants experienced positive gains from their experiences which challenged them to aspire more advancement for themselves. Themes generated were endurance, perseverance, risk taking competence and determination. Coping mechanisms of the participants included proper planning and time management, optimism and positivity, achieving life – work balance, and inspiration and support system. Despite the rigors of life as teachers with multiple ancillary functions, they shared positive insights about their experiences on commitment and dedication, being positive, prospects for growth and development and as a testament of faith and trust in one’s abilities.

The Level of Readiness in Mathematics of First Year High School Students of Cluster 6 Tugbok Secondary Schools: Basis for Intervention Program

2

Pages 88-98
Galabo, Norman, Raotraot, Abellanosa, Gaudencio, Gorgonia, Gempes, Gloria, Pacifico

Abstract
The purpose of the study was to determine the level of readiness in Mathematics of First Year High School students of Cluster 6 Tugbok Secondary Schools, Division of Davao City, Philippines. The test contained Mathematics learning competencies namely: Whole Numbers, Fractions, Decimals, Percentage, Geometry, Measurement and Graphs. It used descriptive quantitative method of research where means and standard deviations were computed to determine the level of mathematical readiness. Respondents were chosen through random sampling technique. Mean ratings based on the three achievement tests administered were very low for Grade 6, moderate for Grade 5 and high for Grade 4. Results showed that the respondents are prepared for Grade 5 level. Based on the t-test results on the significant difference in terms of mathematical readiness when analyzed by sex, it was established that female students were more prepared than male students. The results suggest an intervention program to be formulated in order to improve the level of Mathematical readiness of freshman students.

Invaluable Narratives on Long Life: A Multiple Case Study

2

Pages 99-106
Gloria P. Gempes

Abstract
This qualitative multiple case study contains longevity practices of octogenarians gathered through in-depth interview involving two women and one man with ages 82, 85 and 88. What enabled these animated octogenarians lived so long is an invaluable lesson in life to be profoundly considered. Seven themes common to the three cases and three case-distinct themes were generated from the study. The result of the study is beneficial to the succeeding generations, especially the retiring sexagenarians (aged 60-69) in the academe, who are beset with stressful pedagogical activities

Metacognitive Strategies and Reading Comprehension of Pupils in South Glan District- Elementary Schools

2

Pages 107-111
Farrah Princess D. Restauro

Abstract
Metacognitive strategies are higher order executive skills that are essential for planning, for monitoring or evaluating the learners’ comprehension while reading. Thus, these strategies decreased reading difficulties, developed reading performances and actively increase pupil’s comprehension of a text. The present study determined the extent of use of the metacognitive strategies and the level of the reading comprehension of the pupils. This study also conceptualized if there is a significant relationship between the two variables. The needed data for this study were gathered using two instruments, a survey type questionnaire and a reading comprehension test. The Ebel’s Criteria was used to determine the level of reading comprehension of the pupils and a five -point scale was used to describe the extent of use of metacognitive strategies of the pupils. Using the data gathered from the survey and PHIL-IRI test scores of one hundred ninety-two (192) accessible Grade VI pupils, ninety-seven (97) boys and ninety-five (95) girls. This study found out that the pupils used their metacognitive strategies to a high extent and their reading comprehension is at moderate level. Using the Pearson Product Moment Correlation Coefficient analysis, the relationship between the extent of use of metacognitive strategies and the reading comprehension level of pupils is very low but statistical analysis computed that they are not statistically significant. This further recommends that learners should apply other strategies that may help them to easily comprehend what they read.

A Critical Discourse Analysis of Headlines in Online News Portals

2

Pages 112-123
Glorilyn M. Montejo, Teresita Q. Adriano

Abstract
This study aimed to determine the discursive devices used in the news headlines, unravel the ideologies of the media practitioners, and reveal the insights that can be generated from the findings. Thirty headlines were gathered from five major online news portals in the Philippines namely: ABS-CBN, CNN Philippines, GMA, Interaksyon, and Rappler. This study is seen through the standpoint of Critical Discourse Analysis (CDA) by Fairclough (1995). Results showed ten discursive devices used in the headlines by media practitioners to attract attention from readers that may direct them to not just read the headline but read the entire article. These are evaluative language, vocabulary, intensification and quantification, immediacy, reference to emotion, reference to elite people, role labels, institutional agency, country, and events. It was also found out that these devices brought out media practitioners‟ ideologies. It was further found out that writers or editors were objective or neutral, subjective or biased and misleading. They were shown through the use of direct and indirect quotation, numbers and figures, and choice of words in writing the headlines. The selection of the language used in headlines showed the political inclinations of the news writers or editors who intentionally choose only those news or speeches which may create sensational feelings among the readers. To put it simply, the writer or editor‟s angle of judgment reflected how he or she wanted the readers to perceive the issue.

What Do South African Teacher Education Students Say About Multicultural Education? An Explorative Study

2

Pages 124-129
Gregory Alexander

Abstract
The aims of multicultural teacher education encompass the following: enabling teachers to develop positive attitudes and behavior towards learners of diverse backgrounds, which includes maintaining high expectations for their academic success; imparting skills to support their cultural and emotional well-being; developing economic equity and promoting social justice in schools and the broader community. Noting these aims, evidence from numerous research studies, however suggest that Teacher Education students ( pre-service teachers) enter classrooms culturally, socially, racially and ethnically incompetent. This study therefore reports on the views of 3rd year Teacher Education students, taking the course IRM12AS (Introduction to Research). Via a qualitative content analysis research method, the assignments of 89 students were studied as to ascertain Teacher Education students’ views on issues relating to multicultural education and schooling. Findings further revealed that Teacher Education students hold different conceptions of diversity, quality education, multiculturalism, teaching and learning. This study suggests that university initiatives around multicultural education shouldn’t be treated as once-off attempts, but should be integrated in the curricula of clearly identified courses.

Diversifying Livelihoods in the Reduction of Extreme Poverty: A Case Study of Household Beneficiaries of Public Works Program in Rwanda

2

Pages 130-140
Justine Mukandakebuka

Abstract
The government of Rwanda has since 2008 initiated a pro-poor growth program known as Public works as part of the national poverty reduction efforts. The public works’ activities provide labor work in infrastructure development projects to extremely poor household beneficiaries in the rural areas, who are the public works’ main target. This research is located in Gihango sector in Rwanda Western Province’s Rutsiro District which has experienced high poverty and extreme poverty incidence. This study aims to assess ways in which physical and economic capitals generated through different activities under public works’ program, contribute to an enhancement of both beneficiaries’ livelihoods, and those of their communities. It aims also to investigate diverse strategies that the household beneficiaries employ to make use of economic and physical capitals obtained through public works’ program to sustain their livelihood security, and in the long term, to achieve the graduating from extreme poverty conditions. Through in-depth interview, research questionnaire, and participant observation approaches, a case study was used with regards to assessing the relationship between public works’ benefits and household beneficiaries’ livelihood diversification in improving living conditions and ensuring livelihood security. Both quantitative and qualitative data were collected from 32 household beneficiaries and five local authorities in November 2017. Through ethnographic approach and analysis, the research reveals the social-economic benefits of public works program in improving living conditions of beneficiaries while also enabling their social integration in the community’s activities. Among these benefits were job creation, the reduction of school dropout, access to health services, increasing opportunities in other economic activities, gender inclusion, and social integration. The study find out the benefit of economic capital from the program to play an important role in solving everyday needs and ensuring livelihoods security of beneficiaries. Indeed, nutrition, education, health, as well as asset accumulation were the areas in which economic capital from public works was most helpful. The study documented the diversification of livelihood activities by beneficiaries based on their choice, capabilities, and availability of opportunities in their areas. Examples varied from participation in community savings groups, investment in small animals farming, trade in foods and other commodities, and access to bank credit to support self-reliant economic activities as among the strategies to expand livelihoods activities. The research argues that livelihood diversification enhances livelihood security, thus highlighting enabling roles of socio-economic and physical capitals made available under public works’ activities.

Stakeholders’ Involvement in an Organic Food Network Under Actor-Network Theory Perspective

2

Pages 141-148
Nguyen Thuy Dung

Abstract
This research aims to explore in what way an organic food network is formed and maintained in Hoi An and how this network involves different stakeholders to encourage social control for food safety and ensure trusty certification of local organic food. Through theoretical lens of Actor-network theory, I could identify human and non-human stakeholders as well as their roles in the network, and explain the network formation process. By conducting qualitative research, I did in-depth interview and participation observation, and figured out two main results of this research. Firstly, the process of network formation and maintenance is a translation process through four stages: problematization, interessement, enrollment and mobilization. Various stakeholders are translated and enrolled as actors into the network such as farmers, consumers, local authorities, NGO, experts, certification system and environment conditions. In which, local NGO and local authority, as focal actors, play key roles in this translation process. Secondly, a non-human actor, Participatory Guarantee Systems (PGS) certification, plays as a mechanism of operating organic food network. Through an organized structure which has different levels including individual farm families, producer group, inter-group and coordination group, PGS certification enhances the involvement of various stakeholders and equal power relation among them as well as contributes to social cohesion and empowerment of the local.

Using Activity Oriented Design Method (Aodm) to Understand the Use of Gmail and Wechat A Case Study of Bhutan

2

Pages 149-161
Kesang Choden, Thippaya Chintakovid

Abstract
This research presents a case study of Land Sector (LS) of a particular Bhutanese organization to understand roles played by different communication technologies to accomplish tasks. The LS’ primary function is to quickly solve land dispute cases efficiently. LS staff are constantly on the move to visit disputed lands. Although Gmail is the main communication technology, it is more suitable in offices. While on the move, accessing emails through mobile devices cannot fully support the staff. Thus, they have incorporated WeChat as an alternate means. This practice requires them to switch their attention between the two media, resulting in distributed information and inefficiency. Using Activity-Oriented Design Method (AODM), this paper’s objective was to understand the use of Gmail and WeChat to solve land dispute cases. Twenty-five interviewees and forty-two questionnaire respondents were selected based on their role in land related activities. Data analysis was performed using AODM, qualitative content analysis and descriptive statistics. Findings revealed that to comply with regulations to close dispute cases on time, LS staff and relevant stakeholders were required to coordinate several meetings and proactively discuss the cases. Gmail was mainly used to send large attachments and label messages according to ongoing activities. File storage and synchronization services of Gmail were also considered valuable features. For WeChat, voice messages and in-app voice calls were mainly used to share information, discuss, and clarify doubts in local dialects. Small-sized files were frequently sent via WeChat. These findings will offer insights and implications for designing future communication technology.

Track: Engineering and Technology Studies

Investigation of effects of Cutting Speed on Tool Wear with Optimum Temperature MQL Aerosol

2

Pages 162-170
S. W. M. A. I. Senevirathne1, R. K. P. S. Ranaweera

Abstract
This study is focused on evaluating newly developed chilled-emulsion Minimum Quantity Lubrication (MQL) method on machining hard-to-cut metals. Previous research work revealed that, aerosol at 15 °C provides the optimal tool life and generates the least surface roughness when machining AISI P20 and D2 tool steels at a given cutting speed. In that context, the influence of varying cutting speeds with MQL aerosol at 15 °C is further studied in this paper. Three cutting speeds were used as per the tool manufacturer‘s recommendations. For the aforementioned cutting conditions, tool nose wear were measured and topologies of worn cutting edges were observed and compared. The experimental results revealed that tool wear rate and other forms of damages such as chipping and plastic deformation for different work material have contrasting responses. This indicates that MQL aerosol performance is notably sensitive to work material properties and its benefits as a cutting fluid should be further investigated over wider range of materials.

Flow Past Porous Cylinder/Sphere With/Without Blowing

2

Pages 171-184
Hsing-Sheng Chai, Hui-Zhen Chen2, Chiun-Hsun Chen

Abstract

Flow characteristics around/behind a porous circular cylinder and porous sphere in a wind tunnel are studied. The parameters are incoming flow velocity (Uin), air ejection velocity (Vw) from the surface of cylinder/sphere, and dimension/shape of cylinder/sphere. This study is divided into dual parts. First part deals with flowfield with no air ejection from the surface of cylinder/sphere, and the second one deals with the flowfield for air ejection from cylinder/sphere surface. Finally, for each cylinder/sphere, Vw and critical Uin that causes the wake returns to the rear of cylinder/sphere are correlated into equations, respectively.


Effect of Settling Time and PH on the Treatment of Domestic Grey Water using Custard Apple Seeds as Natural Coagulant

2

Pages 185-192
Rathore Kavish, Nautiyal Roopika, Raj Ishant, Uliana Shivangi, Shah Brij, T S Anantha Singh

Abstract

Water scarcity along with climate change, population growth and urbanization pose challenges for the present water supply systems. Today, 2.1 billion people worldwide are living without a safe water supply close to home. Hence, domestic wastewater treatment along with its reuse is becoming a significant topic for research. Grey water is all wastewater generated in households, public or commercial properties without fecal contamination. Treating and reusing grey water reduces the amount of freshwater needed and also reduces the amount of wastewater entering sewer system. The grey water sample was collected from a residential society in Ahmedabad and the natural coagulant used was freely and locally available Custard Apple (Annona Reticulata) seeds. The initial characteristics of the grey water were accessed based on the parameters pH, TS, TDS, Turbidity and COD and measured as 7.79, 780 mg/L, 590 mg/L, 276 NTU and 625 mg/L respectively. Turbidity and COD were analysed for different concentrations of Coagulant Dosage and also by varying the Settling Time and pH. The settling time was varied from 10 to 30 minutes considering the removal of micro-flocs and pH was varied from 4 to 9. The optimum results were obtained at settling time of 30 minutes, pH 9 and 10 mg/L coagulant dosage giving 85% turbidity removal and 82% COD removal. It was observed that adding organic coagulant beyond the optimum level contributes to COD. The study focuses on investigating the effect of natural coagulant on treatment of domestic grey water along with factors affecting the removal efficiency.


A Review on Cement and Fine Aggregate Replacement in Micro Concrete Roofing Tiles

2

Pages 193-200
Joshi Jatan, Kapadia Drashti, Dhananjaya H R

Abstract

This review paper emphasizes on various suitable replacements of cement and fine aggregate in concrete tiles, so as to reduce problems of global warming and to create sustainable environment. Proper roofing is a major issue in rural and sub-urban areas as they suffer immensely due to the high cost of present day concrete tile roofing technique and adverse weather conditions. The conventional roofing system in rural areas is made of thatch or fired clay tiles which cannot perform well under adverse weather conditions while in urban areas, Asbestos-cement tiles are used which suffice in terms of strength and permeability but cannot perform thermally. Micro Concrete Roofing Technology in India is a potential alternative of a common industrial concrete tile which is much thicker and heavier. Concrete tiles comprise of cement (30-50%), fine aggregate (50-70%), admixtures along with water. In 2017, India consumed 270 million metric tons of cement. The production of Portland cement is not only costly and energy intensive, but it also produces large amounts of carbon emissions. Fly ash is commonly used in concrete in replacement ranging from 0% to 30% by weight of the total cementitious material. Large quantities of fly ash and quarry dust are available around the world at low cost and their use in high volume seems to offer the best solution to rising cement and fine aggregate demands, respectively. According to a study, replacing cement by fly ash up to 65% gives about 46.77% cost beneficial to that of original mix cost. Various factors such as strength, durability, reuse and problem solution has been compared with previous investigations and approaches to most suitable replacement for cement concerning all parameters. The study focuses on partially or fully replacing cement by fly ash and fine aggregate by quarry dust thereby increasing the overall strength by 50% and reducing the cost reasonably.


A Study on Finite Element Analysis of Seat Cushion Frame with Carbon Fiber Composite

2

Pages 201-205
Kang, Hee Yong, Shin, Hyeon Ho, Yoo, Jung Cheol, Lee, Il Taek, Yang, Sung Mo

Abstract

The light weight design of the seat cushion frame using carbon fiber composite was performed. Additionally, the safety of the seat cushion frame with carbon fiber composite that is attached to the pipe was analyzed through the finite element analysis. The seat cushion frame with the carbon fiber composite was divided into front part frame, left side frame and right side frame after considering the manufacturing process and compression molding characteristics. In order to analyze how the pipe that supports the seat cushion part has effect on the safety of the seat cushion frame, modeling of the carbon fiber composite seat cushion frame according to the reinforcement of the pipe was performed. AFT moment load, vertical load and lateral load based on the FMVSS 207 seating system test procedure were applied to the seat frame. Boundary conditions were considered as the carbon fiber composite seat cushion frame was fastened on both sides and one side of the vehicle floor respectively. Since the stress and displacement of carbon fiber composite seat cushion frame were analyzed by the finite element analysis according to each boundary, the load condition and the pipe reinforcement variables, as well as the design conditions of the carbon fiber composite seat cushion frame suitable for the vehicle were confirmed.