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27,404 Article Results

An Optimal Replenishment Policy for the EPQ Model with Permissible Delay in Payments

10.11591/ijaas.v5.i1.pp13-20
Shih-Ming Ou , Kuo-Kuang Chang
Most of the past researches on economic replenishment quantity did not consider the trade credit period. In practice, however, companies in Taiwan have shown that taking the trade credit period into account when they are making inventory decisions decreases costs substantially. The aim of this paper is to develop an inventory model that incorporates a delay in payments to minimize the total inventory-relevant cost. The optimal replenishment policy of the proposed model is identified by utilizing the global optimum conditions and non-constrained quadratic nonlinear programming. The results show that the existence of global optimal inventory cycle under the condition of total cost function is convex. Accordingly, the proposed model can assist managers in effectively addressing EPQ issue under competitive market.
Volume: 5
Issue: 1
Page: 13-20
Publish at: 2016-03-01

The Retention of Women in Science, Technology, Engineering, and Mathematics: A Framework for Persistence

10.11591/ijere.v5i1.4515
Jeffry L. White , G.H. Massiha
Women make up 47% of the total U.S. workforce, but are less represented in engineering, computer sciences, and the physical sciences. In addition, race and ethnicity are salient factors and minority women comprise fewer than 1 in 10 scientist or engineer. In this paper, a review of the literature is under taken that explores the many challenges women encounter when pursing a career in the sciences. It includes a review of the national landscape and discussion of the guiding general retention theories. Finally it proposes a conceptual framework for persistence and proffers a number of research questions designed to delve deeper into the under representation phenomenon.
Volume: 5
Issue: 1
Page: 1-8
Publish at: 2016-03-01

The Roles of Teachers’ Work Motivation and Teachers’ Job Satisfaction in the Organizational Commitment in Extraordinary Schools

10.11591/ijere.v5i1.4520
Fatwa Tentama , Dessy Pranungsari
Teachers’ work motivation and teachers’ job satisfaction are the factors influencing the organizational commitment. This research is aimed to empirically examine the roles of teachers’ work motivation and teachers’ job satisfaction in the commitment of the organization in extraordinary schools. The subjects of the research are the teachers in Extraordinary School 1 Bantul Yogyakarta. The sample was taken by employing non-randomized technique. The scales of work motivation, job satisfaction and organizational commitment are used in collecting the data. The data were analyzed by using multiple linear regression technique. The results of the research show that 1) simultaneously, teachers’ work motivation and teachers’ job satisfaction are highly significant positive correlated with organizational commitment, by reaching the score of Rx1x2v=0,621 with the probability p=0,002 (p<0,01); 2) teachers’ work motivation are highly significant correlated with the organizational commitment, by reaching the score of (rx1v))=0,614 and the probability p=0,000 (p<0,01); 3) teachers’ job satisfaction is highly significant positive correlated with organizational commitment, by reaching the score of (rx2v))=0,570 and probability p=0,001 (p<0,01). Teachers’ job motivation more dominantly influence organizational commitment compared to teachers’ job satisfaction
Volume: 5
Issue: 1
Page: 39-45
Publish at: 2016-03-01

An Experimental Study of the Unbalance Compensation by Voltage Source Inverter Based STATCOM

10.11591/ijpeds.v7.i1.pp45-55
Anas Benslimane , Jamal Bouchnaif , Mohamed Azizi , Khalid Grari
This work presents an experimental study of the unbalance compensation caused by the high speed railway substations in the high-voltage power grid with a shunt voltage source inverter based STATCOM. This experimental study is realized on a reduced scale prototype. The Control of inverter is implemented in a DSP card. The practical results presented in this paper are shown the performance of unbalance compensation by VSI_STATCOM in static and dynamic regime.
Volume: 7
Issue: 1
Page: 45-55
Publish at: 2016-03-01

The Potential Impact of Online/Distance Education for Students with Disabilities in Higher Education: Results from a Meta-Analytic Investigation and Existing Research

10.11591/ijere.v5i1.4525
Matthew J. Erickson , Karen H. Larwin
The current investigation sought to understand if online and distance course offerings were providing a needed bridge to a post-secondary degree for students with disabilities.  The results of this investigation suggest that there is an absence of empirical research on this topic in the existing published research.  Results presented include findings from the K-12 data examining this impact, and the results from federal investigations on the prevalence of individuals with disabilities attending post-secondary institutions.  
Volume: 5
Issue: 1
Page: 76-81
Publish at: 2016-03-01

The Correlation between Sex, Age, Educational Background, and Hours of Service on Vigilance Level of ATC Officers in Air Nav Surabaya, Indonesia

10.11591/ijere.v5i1.4516
Lalu Muhammad Saleh , Tjipto Suwandi , Hamidah Hamidah
The vigilance of an Air Traffic Control (ATC) officer determines aviation safety. The number of aviation accidents tends to be increasing in recent years. Aviation accidents may be caused by human errors (i.e. errors made by pilot or ATC officer) or unsafe work condition. Sex, age, educational background, and hours of service might affect vigilance level of an ATC officer. This study was conducted to analyze the effect of sex, age, educational background and hours of service on ATC officers in Air Nav Surabaya vigilance level. This study applied cross-sectional study design with the number of samples was 41 staffs at Air Nav Surabaya. The obtained data were analyzed by using chi-square test. The results of data analysis indicated that sex, age, and educational background variables did not significantly affect vigilance level of ATC officers in Air Nav Surabaya as indicated by chi-square values of sex variable (p= 0.790), age variable (p= 0.241), and educational background variable (p= 0.335). Meanwhile, hours of service variable significantly affected ATC officer vigilance level as indicated by chi-square value (p) as much as 0.035. Based on these findings, it can be concluded that sex, age, and educational background variables did not correlate with ATC officers’ vigilance level while hours of service variable significantly correlated with ATC officers’ vigilance level.
Volume: 5
Issue: 1
Page: 9-13
Publish at: 2016-03-01

Technical and Economic Evaluation of Hybrid wind/PV/Battery Systems for Off-Grid Areas using HOMER Software

10.11591/ijpeds.v7.i1.pp134-143
Alireza Gheiratmand , Reza Effatnejad , Mahdi Hedayati
Incremental consumption of electrical energy, reduction of fossil fuel resources and environmental pollution problems caused by them are the main reasons, which tend the managers and officials in countries energy sector to develop use of renewable systems. In the not-too-distant future the use of renewable energy such as wind and solar will be very important and will play predominant role in economic indices of power systems. In recent years, technological advances in renewable energy and increasing price of petroleum products promote system managers to use low-cost and low-emission energy resources in form of hybrid systems and widespread propagation of electricity generation have been developed in remote areas. In Hybrid systems two or more sources of renewable energy is typically adopted, which increases the reliability of these systems. In this paper, the technical and economical consideration of a wind and solar hybrid system to supply electrical energy for a number of remote users (aid and medical emergency Shelter in Yazd) is provided. In order to investigate optimization and economic analysis of the proposed hybrid system, the HOMER software is used.  The results of Simulation in HOMER software show that Solar cells and wind systems with average generation power of 896 kWh/yr. and 343 kWh/yr., consist proportion of 72 and 28 percent of the total generated energy respectively, which are dedicated to satisfy the loads
Volume: 7
Issue: 1
Page: 134-143
Publish at: 2016-03-01

Formulating Employability Skills for Graduates of Public Health Study Program

10.11591/ijere.v5i1.4518
Nurul Qomariyah , Titi Savitri , Tridjoko Hadianto , Mora Claramita
Employability skills as non technical skills are important for effective and successful individual participation in the workplace. The main aims of the research were to identify important employability skills needed by graduates of Public Health Study Program Universitas Ahmad Dahlan (PHSP UAD) and to assess the achievement of the employability skills development that has been carried out by PHSP UAD. This study used a mixed method research with convergent design. Quantitative research was conducted with survey to graduates. Qualitative research was conducted with structured interviews to employers. Both data were analyzed separately and interpreted concurrently. Graduates and employers of PHSP UAD in broad outline were in line on the important employability skills needed in the workplace and the assessment of the achievement. Several employability skills consistently were considered important. The achievement of employability skills that were related to public health knowledge and its application was high, meanwhile the achievement of several important employability skills which are needed in the work place in the 21st were low. Employability skills needed for graduates of PHSP UAD were formulated. Curriculum revision is recommended to integrate employability skills into core activities to promote the development of employability skills of PHSP UAD graduates. 
Volume: 5
Issue: 1
Page: 22-31
Publish at: 2016-03-01

Augmented Diffuser for Horizontal Axis Marine Current Turbine

10.11591/ijpeds.v7.i1.pp235-245
Aly Hassan Elbatran , Omar Yaakob , Yasser Ahmed , Firdaus Abdallah
The potential of renewable energy sources is enormous as they can make a major contribution to the future of energy needs. The ocean has a great potential to become a practical and predictable energy source compared to other energy resources such as solar, wind, and nuclear. It offers different sources of energy which can be utilized namely wave, tidal, offshore wind, thermal, and tidal current. Among these sources, marine tidal current has major advantages such as higher power availability and predictability. The main objective of this research work is to design and develop a horizontal axis marine current turbine (HAMCT) that suitable for operating within Malaysian ocean, which has low speed current (0.5 – 1 m/s average). A prototype of augmented diffuser 4-bladed HAMCT applying NACA 0014 was proposed in the current study. The turbine model has 0.666 m diameter, and it was designed to produce as much as power from flowing water current. Model was constructed and tested at Marine Technology Center (MTC) in three conditions, namely, free tow testing, ducted tow testing, and ducted diffuser tow testing in order to predict the power and efficiency of the turbine system. The results showed that the application of duct was significant to concentrate the flow and diffuser arrangement was effective when it was placed behind of the rotor in this condition of low water current speed. The maximum efficiency Cp obtained in the current system was 0.58.
Volume: 7
Issue: 1
Page: 235-245
Publish at: 2016-03-01

Development of Web-Based Learning Application for Generation Z

10.11591/ijere.v5i1.4523
Bambang Hariadi , M.J. Dewiyani Sunarto , Pantjawati Sudarmaningtyas
This study aims to develop a web-based learning application as a form of learning revolution. The form of learning revolution includes the provision of unlimited teaching materials, real time class organization, and is not limited by time or place. The implementation of this application is in the form of hybrid learning by using Google Apps for Education (GAfE), called Brilian. Steps being taken in the study are: (1) requirements analysis, (2) interface design, (3) construction performance, and (4) testing and implementation. The subjects of this study were students of class 2014 and course lecturers for the student of class 2014. After the system testing that was conducted in the second semester of 2014, the collected data suggest that out of 1153 students who used this application, 79% of them were comfortable in using it. As for the lecturers, the data was obtained from 70 lecturers, 82% of them stated that this application helped their teaching process. From the evaluation results, it requires universities to further improve the network infrastructure, and applications must be developed to be more user friendly, including access to mobile learning.
Volume: 5
Issue: 1
Page: 60-68
Publish at: 2016-03-01

A New 6 DOF Robotic Arm with Linkage Motion Mechanism and Actuators Placed in Base

10.11591/ijra.v5i1.pp35-48
Mohsen Shahhosseini , Rambod Rastegari , Roozbeh Abbasi
We examined mechanism design and kinematic simulation of a new six degrees of freedom (DOF) robotic arm with rotational joints and a linkage motion mechanism. In the design, a parallel linkage mechanism, accompanied by an additional set of bevel gears, was used to create the desired motion for all six links along with transfer of all actuators to the robot’s base to reduce the mass of most of the arms. These changes resulted in reduction of the torque required for joints 1, 2, and 3. Using this parallel mechanism ensures dependence to motion links and creates a special case for the control of the robot and more rigidity against unwanted movement. Initially, we examined mechanism design methods for a parallel linkage mechanism and considered methods for application in an operational robot. In the next step, we determined the kinematic relationships that were established between the robot’s actuators and joints spaces due to the use of this mechanism. Then, we developed an example of the robot’s function in a performance simulation. The simulation results indicated that the mechanism and controller performance were acceptable.
Volume: 5
Issue: 1
Page: 35-48
Publish at: 2016-03-01

A Study of the Apology Strategies Used by Iraqi EFL University Students

10.11591/ijere.v5i1.4519
Raed Latif Ugla , Mohamad Jafre Zainol Abidin
This study was aimed at exploring apology strategies of English used by Iraqi EFL students, apology strategies in Iraqi Arabic and the pragmatic strategies of Iraqi EFL students in relation to the use of apology as a speech act. The data analyzed in this study were collected in Al-Yarmouk University College and University of Diyala. The study was mixed method in nature using a questionnaire and an interview adapted from previous studies. The quantitative data was obtained from fifty-five Iraqi EFL students using Discourse Completion Task Questionnaires (DCTQ) while the qualitative data obtained from individual interviews carried out with twelve Iraqi EFL students. The results were showed different kinds of apology strategies used by Iraqi EFL students. A new classification of apology strategies was provided in this study. Results of the study showed that Iraqi EFL students used a variation of apology strategies, they were well aware of how to use adequate apology forms to meet the requirements of specific situations and relationships, and they felt the need for explaining and avoiding interpretation of their response as an apology.
Volume: 5
Issue: 1
Page: 32-38
Publish at: 2016-03-01

Automation in the unloading and loading process of hot rolled coil using workspace simulation software : A Review

10.11591/ijra.v5i1.pp49-53
Kunal Abhay Patil , Santosh Jaju , Babu Achmare
The aim of this paper is to confirm the importance of unloading and loading process of hot rolled coil and automation in manufacturing industry.  This paper describes about the different systems which are used in various ISPAT industries for material handling purpose or lifting the heavy coils. There are six main systems which are used in industries for material handling purpose. After studying all these systems, we will propose one system which is more beneficial than other systems. Later in this paper we will also study the introductory part of the workspace simulation software, its features, benefits and applications. The objective of this project is to overcome the problems at industry by designing and simulating a robot arm to perform the task. By simulating, the process of unloading and loading of hot rolled coil can perform more effectively. Workspace LT is the software used in this project.
Volume: 5
Issue: 1
Page: 49-53
Publish at: 2016-03-01

Path Analysis: Health Promotion Information Access of Parent Caretaking Pattern through Parenting Education

10.11591/ijere.v5i1.4524
Tri Sunarsih , Bhisma Murti , Sapja Anantanyu , Mahendra Wijaya
Parents often inhibit learning process organized by education, due to their ignorance about how to educate child well. Incapability of dealing with those changes leads to dysfunctional families, and problematic children. This research aimed: to analyzed the health promotion information access pattern of parent caretaking pattern through parenting education. This study was taken place in Karanganyar Regency area, Central Java. As a survey research with cross-sectional design, this study built on questionnaire as a main instrument of collecting primary data, while secondary data was obtained from recording in the related institutions in Karanganyar Regency. The sample consisted of 108 parents, taken using purposive sampling technique. To address the objective, multiple linear regression and path analyses were used. Its important finding was that interactions with other students’ parent, with other members of family, and with media simultaneously affected significantly the parenting pattern holistically, either directly or indirectly. The largest effect on parenting was exerted by interaction between parent and media. From those findings, the author recommended that the appropriate parenting education strategies were to provide adequate information such as reading books for parent, to facilitate parent discussion to generate interaction between parents so that they shared information more frequently.
Volume: 5
Issue: 1
Page: 69-75
Publish at: 2016-03-01

System Thinking Scales and Learning Environment of Family Planning Field Workers in East Java

10.11591/ijere.v5i1.4521
Dwi Listyawardani , Iswari Hariastuti
Systems thinking is needed due to the growing complexity of the problems faced family planning field workers in the external environment that is constantly changing. System thinking ability could not be separated from efforts to develop learning for the workers, both learning at the individual, group, or organization level. The design of the study was quantitative study using cross-sectional study. There is a relationship between the scale of field worker’s system thinking with the learning environment at organization level (p 0.017<α). The characteristic factors; individual, team/group learning environment; are unrelated to the system thinking scales. There are also relationship among learning environments. Individuals learning on systems thinking for field workers are highly needed as a basic capital in the development of human resources. The training/learning done so far needs to be revitalized, that is reconstructing the learning materials or modules taught so as learning can be run more effectively and leads to increase the ability of systems thinking. Organizationrelated to the implementation of field worker tasks lies in the central, provincial and districts/municipalities level, need to facilitate the learning; both at the individual, group/team, and organizational level itself. Learning and guidance need to be developed into a useful integrated mechanism, not only for individuals but also for the organization.
Volume: 5
Issue: 1
Page: 46-54
Publish at: 2016-03-01
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