Open Access Original Research Article

Process Optimization to Eliminate Automatic Alignment Failures on the Scalable Device

A. Sumagpang Jr., F. R. Gomez, R. Rodriguez

Journal of Engineering Research and Reports, Page 1-7
DOI: 10.9734/jerr/2020/v18i117197

The paper focused in addressing the auto align defect at in-strip testing of a semiconductor scalable device in a leadframe technology. Pareto diagram and potential risk analysis were completed to identify the top reject contributors and eventually come-up with the robust solution. Reverse flow was employed to eliminate the alignment issues. The reverse flow, which is testing prior singulation process, eventually resolved the auto align and other singulation related defects as testing is done on a strip form. Ultimately, the error-proofing or Poka-Yoke approach by reverse flow lead to the elimination of auto align failures at final test. For future   works, the parameters and learnings could be used on devices with similar assembly defect occurrence.

Open Access Original Research Article

Comparative Analysis of Optimum Maintenance Cost for Water Boreholes in South-Eastern Nigeria

S. C. Ezekafor, J. C. Agunwamba

Journal of Engineering Research and Reports, Page 22-30
DOI: 10.9734/jerr/2020/v18i117199

Aims: This study considered the optimal maintenance cost of water boreholes for a multiple pumping scenario in South-East Nigeria. The objective of the study was to determine the optimal maintenance cost of water boreholes for the Southeastern region of Nigeria.

Place and Duration of Study: The data used in this study is secondary data obtained from selected community and commercial boreholes in the Abia State, Anambra State, Ebonyi State, Enugu State and Imo State.

Methodology: The linear model and the quadratic model were used to determine the cost parameters for the optimization of the maintenance cost of the water boreholes.

Results: The result of the study showed that the maintenance cost obtained for Anambra State is more adequate than the other states since it recorded a higher coefficient of determination value using the linear and quadratic model. Also, it was found the quadratic model was better than the linear model for the estimation of cost parameters used for determining the optimum maintenance cost of water boreholes in South-East Nigeria. The findings showed that the quadratic model recorded the best net savings for Abia, Anambra, and Enugu with the corresponding cost of ₦4,079,246.817, ₦5,198,716.141, and ₦4,767,680.392 respectively. It was found that the linear model recorded the best net savings for Ebonyi and Imo with the corresponding cost of ₦1,593,013.72 and ₦8,692,452.91 respectively. Hence, the quadratic models was identified as the best model for the estimation of cost parameters and enhance the performance of the optimal total operating cost of the water borehole model in South-East Nigeria.

Conclusion: The study concludes by recommending the quadratic model for the estimation of cost parameters for the optimization of maintenance cost of water boreholes until further studies prove otherwise.

Open Access Original Research Article

Alternative Method for Estimating the Maintenance Cost of Roads in Anambra State, Nigeria

Godspower Onyekachukwu Ekwueme, John Obatarhe Emunefe, Nkechi Udochukwu Otty, Charles Okechukwu Aronu

Journal of Engineering Research and Reports, Page 31-38
DOI: 10.9734/jerr/2020/v18i117200

Aims: This study proposed an alternative method for the estimation of maintenance cost of roads in Anambra State, Nigeria. The proposed method referred to as the permuted quadratic model (PQM) involves permuting of the dependent variable of the quadratic model.

Place and Duration of Study: The data used in this study was secondary data sourced from the records department of consolidated construction company asphalt plant Anambra state, Nigeria from 2004 to 2019.

Methodology: The linear regression model and the permuted quadratic model were used to analyze the data for the study.

Results: The result found that 74.0% correlation exists between the observed maintenance cost of roads and the predicted maintenance cost of roads using the linear model while the predicted maintenance cost of roads using the permuted quadratic model has 75.8% correlation with the observed maintenance cost of roads. This result indicates that the proposed permuted quadratic model performed better than the linear model for the estimation of the maintenance cost of roads in Anambra State.

Conclusion: The study recommends the proposed model for the estimation of maintenance cost of roads in Anambra State until future studies prove otherwise.

Open Access Original Research Article

Optimization of Dispensing Parameter to Speed up the Die Attach Throughput

Michael D. Capili

Journal of Engineering Research and Reports, Page 39-44
DOI: 10.9734/jerr/2020/v18i117201

Driven by the company vision to become a high-volume manufacturing (HVM), increasing throughput in the manufacturing line is critical to meeting market demands. The ever-growing demand for integrated circuits in part requires additional capital investment to purchase new equipment such as die bonders to support the new requirement. Making the best of existing resources is often the most common approach to deal with this challenge. Defining the correct method and making the most of the secondary parameters necessary to increase the bonding speed by means of a creative analysis that made this article interesting. The objective of this project is to boost productivity by maximizing UPH to improve the epoxy writing process at Attach, which is a bottleneck area. Optimization of the dispensing sequence and the dispensing direction to improve and speed up the epoxy dispensing process unit per hour.

Open Access Review Article

Noise Pollution in Nigeria’s Institutions of Higher Learning: A Review

Cornelius Ogbodo Anayo Agbo

Journal of Engineering Research and Reports, Page 8-21
DOI: 10.9734/jerr/2020/v18i117198

Education is the cradle of development and must be properly guarded. Higher institutions are citadels of learning engaging in high intellectual discourse that require quiet ambience. The high noise level in Nigeria’s institutions of higher learning has become a growing concern. This paper reviewed the studies done concerning noise pollution vis-à-vis the noise sources, its effects and abatement measures put in place if any. Modular mini electric generators, road traffics and religious organization’s activities were found culpable to the majority of noises produced both inside the institutions and their neighbourhoods. More than 90% of the institutions' community are exposed to disturbing noise levels. The review showed that most of the institutions’ measured noise levels range between 50 dB(A) and 110 dB(A). Also, the majority of the exposed persons feels helpless while hoping to habituate with the conditions. There is a need, therefore, for the school management to collaborate with the government to ensure that sustainable noise mitigation measures are put in place in the institutions to avert its negatives consequences on students’ performance and staff output.