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KKU Engineering Journal
ISSN 0125-8273 · Khon Kaen University · 126 articles in the index
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Journal Article
Ant colony system (ACS) with hybrid local search to solve vehicle routing problems
This research applied an Ant Colony System algorithm with a Hybrid Local Search to solve Vehicle Routing Problems (VRP) from a single depot when the customers’ requirements are known. VRP is an NP-hard optimization problem and has usually been successfully solved optimum by heuristics. A fleet of…
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Continuous quality inspection in hard disc drive manufacturing: A case study
This paper presents the continuous sampling plan CSP-100 that was developed from the continuous sampling plans CSP-1, CSP-4 and CSP-C. The objective of this paper is to apply the continuous sampling plan for the new CSP-100 plan proving a reduction in the delivery inspection time compared to the…
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Alternative modeling schemes for propositional calculus problem
The main objective of this paper is to discuss alternative approaches to convert a propositional logic problem into a 0-1 integer program. The substitution method proposed by Williams and CNF method is used for modeling and representation of logical inference problem. The similarity between the two…
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Improvement of solar ethanol distillation using ultrasonic waves
This report presents a study on the use of ultrasonic waves in solar ethanol distillation to investigate the performance of ultrasonic waves at a frequency of 30 kHz and at 100 Watts that were installed in the inlet area of a 10-litre distillation tank. Based on the non-continuous distillation…
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Structural comparison of anodic nanoporous-titania fabricated from single-step and three-step of anodization using two paralleled-electrodes anodizing cell
Anodization of Ti sheet in the ethylene glycol electrolyte containing 0.38wt% NH4F with the addition of 1.79wt% H2O at room temperature was studied. Applied potential of 10-60 V and anodizing time of 1-3 h were conducted by single-step and three-step of anodization within the two…
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Feasibility study of VLH hydro turbine installation at Nam Pung hydropower plant, Thailand
The aim of this research was to study the feasibility of installing a Very Low Head (VLH) hydro turbine at downstream of the Nam Pung hydropower plant by increasing the potential of renewable energy sources for the Electricity Generating Authority of Thailand (EGAT). Due to the constraints of the…
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Improvement of the auto wire feeder machine in a de-soldering process
This paper presents the methodology of the de-soldering process for rework of disk drive Head Stack Assembly (HSA) units. The auto wire feeder is a machine that generates Tin (Sn) on the product. This machine was determined to be one of the major sources of excess Sn on the HSA. The defect rate due…
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Analysis of criteria weights for the assessment of corporate sustainability: a case study in sugar manufacturing
The assessment of sustainability performance has become a topic widely discussed by business practitioners. The complexity of this issue is highlighted by the incorporation of a large number of criteria. Several methods under the context of Multiple Criteria Decision Analysis (MCDA) have been…
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Low frequency wireless power transfer using modified parallel resonance matching at a complex load
In the Impedance Matching (IM) condition of Wireless Power Transfer (WPT), series resonant and strong coupling structures have been widely studied which operate at an optimal parameter, a resistive load, and the high resonant frequency of greater than 1 MHz. However, i) The optimal parameter…
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Journal Article
Hydrological drought frequency analysis of the Yom River, Thailand
The Yom River is subjected to flood and drought annually each for half a year. Several works suggested storing water during the surplus season for use in the dry season. None of them, however, quantified the precise amounts of suggested storage along the river with acceptable risk. In an attempt to…
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Journal Article
Application of Taguchi-fuzzy approach to prediction of maintenance-production workforce parameters for manufacturing systems
Maintenance workforce evaluation has recently received an increased attention in industries due to the significant influence it has on successful manufacturing. Great efforts, from the viewpoints of theory and practice have been taken in the development of the subject. However, its optimisation…
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Preparation of platinum-free tubular dye-sensitized solar cells by electrophoretic deposition
Tubular dye-sensitized solar cells (DSSCs) were developed by replacing expensive materials with lower cost materials as follows: (1) replacing conductive glass electrodes with titanium (Ti) wires and (2) replacing platinum (Pt) catalyst with the mixture of multi-walled carbon nanotubes, MWCNTs and…
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Determination of trace elements in mine soil samples using portable X-ray fluorescence spectrometer: A comparative study with ICP-OES
Lead (Pb), Zinc (Zn) and Cadmium (Cd) levels on soils surrounding of Lakhouat mine (North-West of Tunisia) were measured. The total concentration of these elements in the soil samples was determined by portable X-ray fluorescence (XRF) in situ and compared to the traditional digestion method using…
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Capillary rise simulation of saline waters of different concentrations in sandy soils
Soil salinity causes corrosion of engineering structures worldwide. The main cause of soil salinization is capillary rise of saline groundwater. Soil salinity can be mitigated once the capillary rise of saline groundwater in soils is understood. The objective of this paper is to present…
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Journal Article
The effect of vortex finder heights on separation efficiency of dust cyclone
The effect of vortex finder heights on separation efficiency of dust cyclone has been experimentally investigated in this present study. The separation efficiency of three cyclones with different vortex finder heights was measured as a function of particle size of dust and velocity of air. Husk ash…
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Enhancing indoor positioning based on filter partitioning cascade machine learning models
This paper proposes the method, called the Filter Partitioning Machine Learning Classifier (FPMLC). It can enhance an accuracy of indoor positioning based on fingerprinting by using machine learning algorithms and prominent access points (APs). FPMLC selects limited information of groups of the…
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The effects of energizer and carburizing temperature and time on mechanical properties of hardened big knives in the pack carburizing process
The purpose of this research is to study the effects of energizer and carburizing temperature and time on the mechanical properties of hardened big knives in the pack carburizing process. The mechanical properties of carburized and hardened big knives were compared to those of commercial hardened…
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Early detection of Parkinson’s diseases by using the relation between time response and movement characteristics of human’s arms
Parkinson’s and stroke diseases are closely linked to the brain of the elderly. This study was to investigate the early detecting method of Parkinson’s disease by using the relation between the brain time response and the arm movement characteristics. 120 Healthy people were examined and classified…
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Mathematical aspects for electrical network connections
In this paper, we survey the role of mathematics in electrical network connections. We discuss the behavior of current flows, voltages and impedances mainly for series-parallel networks. In both one-port and multiport electrical networks, the currents through these networks are governed by…
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Participation level of water users in irrigated water management: A case study of Ban Vern Kham Pumping irrigation project, Xaithani district, Vientiane capital, Lao PDR
The objective of this research was to study the participation of water user group in irrigated water management in Ban Vern Kham Pumping Irrigation Project, Xaithani District, Vientiane Capital, Lao PDR, through the analysis of variables and the formulation of participation equation. The study…