NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY

Editorial Note

Kiatkulchai Jitt-Aer — 2023-12-15

Real-Time Weed Location Estimation in Cassava Field Using an Aerial Multispectral Camera

Pongsakon Bamrungthai — 2023-12-15

This research presents a real-time weed location estimation system for precision agriculture in cassava planting. The widely employed vegetation index known as the normalized difference vegetation index (NDVI) was applied to identify and estimate the locations of the weed. The multispectral camera mounted on an unmanned aerial vehicle (UAV) with nadir orientation was used to capture the field images. The NDVI values were calculated in real-time using an onboard microcomputer and streamed weed locations in latitude/longitude format to the ground control station. The UAV with the attached camera was controlled to follow a predefined flight path using user-specified coordinates based on the configuration of the planting area. The flight altitude was set at 10 m above ground level. Experimental flight tests were conducted over a cassava field covering an approximate area of 2,500 m2. The results demonstrated that detected weed locations exhibited errors within the precision bounds of the GPS system. In the future, a spraying system could be implemented on the UAV to eliminate weeds and perform other planting operations.

Automatic Classification and Tracking of Surface Ships

Pisanu Kumeechai — 2023-12-15

In surface-based autonomous driving technology, cameras are essential for routing and object detection. to avoid obstacles or avoid boat collisions. The important thing is to track known ship movements. In this paper, the Thai maritime data set is used. and data visualization for the training model. Next, object recognition is presented using the AlexNet method by simulating and evaluating its performance in different maritime environments. It then proposes a tracking algorithm to track specific objects, especially in high-motion video evaluations. The experimental results show that the tracking algorithm outperforms online and real-time tracking in terms of object tracking accuracy.

Investigating the use of the Siamese network for face sketch – photo recognition

Thiansiri Luangwilai — 2023-12-15

Nowadays, there is an increase in the number of CCTV everywhere. However, there are still many cases when CCTV cannot capture criminal activities and officers have to rely heavily on the eyewitness report. The eyewitness report is used as a piece of evidence and creates forensic face sketches of the criminals. The accuracy of a forensic face sketch is normally low depending on the memory of the eyewitness and the ability of the eyewitness to explain. Therefore, identifying persons from forensic face sketches is very challenging. Moreover, manually searching for the suspected photo from a large database by using a forensic face sketch as input is rather impossible.

As a result, in this research, we propose an algorithm to match a forensic face sketch to a suspected photo in a database. The model used is the Siamese network with a twin convolution neural network. The performance of this proposed network is investigated by using the dataset from the Chinese University of Hong Kong (CUHK).

การออกแบบเฟอร์นิเจอร์ไม้จากเศษวัสดุในอุตสาหกรรมการขนส่งเพื่อต่อยอด แนวทางการออกแบบสู่วิสาหกิจชุมชน

DAN AUTTARAPONG — 2023-12-15

This research aims to study the efficiency of wooden packaging materials and to analyze the design of wooden furniture from waste materials in the logistic industry using a sustainable approach in order to extend the design guidelines to community enterprises. The researcher has studied the related literature reviews in these areas, which are engineering, materials, and industrial product design. This analyzes the attributes of wooden pallet packaging to compare them with the standard of wooden furniture loading performance values from the American Library Association, whose strength is set at 45.37-286.34 kg/cm2. The results found that 3 types of wood were able to demonstrate the strength for the area at 272.16-453.59 kg/cm2, elastic strength at 145.16-333.00 kg/cm2 and toughness at 389.92 - 655.49 kg/cm2, showing all 3 types of wood meet the standard. The statistics used in the data analysis of this research were 1) mean 2) standard deviation 3) IOC analysis. The index of item objective congruence was 1.00 and content validity was equal to 0.58. In terms of the design, it was found that model 1 had the highest level of satisfaction at ( = 4.00) and the design responded to cost-effectiveness at the highest level ( = 4.67) showing that the satisfaction in the design of wooden furniture from waste materials in the logistic industry had the highest level to very good level of satisfaction.

Investigation and Optimization of Printing Parameters of 3D-Printed ABS-Based parts

NAT TANUMONTHON — 2023-12-15

Recently, 3D printers have rapidly expanded and played an important role in the fabrication of composite materials because they are able to design complex and durable aerospace component structures. The objective of this research is to study the effects of printing or processing parameters on 3D printers and find the most appropriate values that provide the best properties for three-dimensional modeling. In this work, the ABS filament was used as a precursor for the 3D printing process, and a study on the effect of nozzle temperature (240°C, 250°C, and 260°C) and infill density (25%, 50%, 75%, and 100%) on morphology, crystallinity index, mechanical properties, and thermal properties was performed. The 3D-printed parts were then characterized using scanning electron microscopes (SEM), universal testing machines (UTM), X-ray diffraction analyzers (XRD), thermal mechanical analyzers (DMA), and thermogravimetric analyzers (TGA). The experimental results showed that at higher nozzle temperatures, the adhesion between the layers improved and the air voids were smaller. These led to an increment in the crystallinity index. In addition, the higher printing temperature can enhance the storage modulus, which makes the part harder to dislocate. The results also indicated that the tensile strength of 3D-printed parts increased with increasing infill density. Nevertheless, these two parameters had no effect on thermal stability since the decomposition temperature did not change even when the processing condition was adjusted.

The Most Efficient Route Analysis Using 3D Maps for Assistance to Aircraft Accident Victims

kriengkrai thana — 2023-12-15

The purposes of this study were to 1) create and design programs by using 3D maps from unmanned aerial vehicles for the most efficient route analysis and 2) support the program for assistance to aircraft accident victims of the Royal Thai Air Force Special Operations Regiment. The researcher analyzed the route from 3D maps which collected data on Khaomakok hill in the area of Navaminda Kasatriyadhiraj Royal Air Force Academy, Muak Lek District, Saraburi Province. The researcher applied the Greedy Algorithm that to analyzed and avoid slope route greater than 60 degrees. The results of the study revealed that: The program was able to analyze and find the most effective route for assistance to aircraft accident victims, the program can display avoidance of routes with a slope of more than 60 degrees which to solve problems the limitations of search and rescue units aircraft accident, reduces team planning time and reduce the delay in saving lives.

The feasibility study of value-added a chicken fat layer from the chicken evisceration process

Yossapol Pongkaew — 2023-12-15

This research aims to study and analyze the feasibility of value-added a chicken fat layer from the chicken evisceration and chicken meat process. The objective is to study ways and compare methods to value-added to chicken fat, then guide the selected experiments and analyze the possibility of value-added to chicken fat by analyzing the process of dissecting chicken meat and chicken fat, prepare flow diagrams, analyze and compare methods of value-added to chicken fat by the Analysis Hierarchy Process (AHP) method. And feasibility to marketing, technical, and economics.

The results showed that the fat acquisition site is in the C production line and LDE production line.
The options for value-added chicken fat include omelet oil for consumption, omelet oil for animal feed, biodiesel production, and soap production. By leading such selections to analyze decision factors through the analytical hierarchy process (AHP), resulting in an alternative to value-added chicken fat. It was found that the number 1 choice was an omelet for consumption, number 2 was an omelet oil for mixing in animal feed, number 3
was soap, and number 4 was biodiesel. The experimental model is accurate and has the appropriate equation
to predict the polar value of chicken oil. Finally, make calculations and compare costs before and after value-added in the adoption of alternative approaches. After the value-added of chicken fat, the company was able to increase its income from 1,665,938.00 baht to 2,229,025.79 baht and increase its income by 563,087.80 baht.

Comparisons of Achievement of Statistics using Applications

Supavadee Leelayut — 2023-12-15

The purpose of this research is to compare the study Navaminda Kasatriyadhiraj Royal Air Force Academy students from teaching by the traditional lecture method in the academic year 2020/2021 with the application of an application for learning in the academic year 2021/2022. The samples used in this research were 18 air cadets studying engineering statistics, academic year 2021/2022. Statistical analysis was done in terms of mean, standard deviation, and t-test. The results showed that air cadets who used the application to study received higher test scores than air cadets who received the traditional lecture method. at a statistically significant level.