Earticle

Background/Objectives: The focus of this paper is to develop an Adjustable Drawing Table and T-square Rack with Lock that can secure the t-squares, triangles and other drawing materials that draftsman, architects, and engineers used in making plates and plans. Methods/Statistical analysis: The rack’s structure consists of 40 sets of bended plain sheet panels. The first 20 panels have a length of 0.80m while the remaining 20 has a length of 0.50m. All panels have the same width which is 0.20m. It has a frame with length of 2.30m. The T-square rack can be converted into a table. The table is made up of ply board with a thickness of ¾ and 1.10x0.78m in size. There are two tables located behind the rack. Findings: It has two drawers that can accommodate 40 pcs. triangle. It has a wing nut that serves as a lock when rotating the table at different angle. Improvements/Applications: A removable table top when it is not needed and detachable second rack from its main rack.

Background/Objectives: Drones were originally developed for military use, and as their technology evolves, they can be said to be the new industrial sector of the 4th Industrial Revolution, which has unlimited possibilities. Methods/Statistical analysis: The first was a hot air balloon, which was actually used in the Battle of Austria in 1849 and subsequently as an important combat weapon in World Wars I and II. On the top of that, drone is unmanned, remote-controlled flight systems. Findings: It's widely used as an entertainment tool, but actually it's not only used for military purposes such as reconnaissance and surveillance, but also for transportation like Amazon Prime Air. Drones are vulnerable to hacking like GPS spoofing, control extortion, and jamming because they're wirelessly controlled. There are these various anti-drones technologies and there are grave risks to drone security. Improvements/Applications: Therefore, it is necessary to protect privacy from unwanted drone to use anti-drones technology.

Background/Objectives: In recent years studies were done to determine the relationship of water content of the soil and its electrical resistivity, devices of different application can be construct using these relationship. The following applications benefitted from these findings like automatic water irrigation, soil moisture test for construction and watering system using soil moisture sensor. Methods/Statistical analysis: This study took advantage of the feature of microcontroller to sense varying resistance and controlling the solenoid water valve. The device is equipped with soil moisture sensor that varies its resistance depending on the conductivity of the soil. When the weather is to hot and the soil is dry, the resistance of the soil increases, if the soil is moist resistance of the soil decreases. Findings: The specific value of resistance was set in the microcontroller that signifies the need to water the plant using solenoid water valve. The controller will automatically open the gate valve of the water source, if the set resistance for watering was reached by the sensor. Improvements/Applications: Since water continuously enters the soil, it changes the resistivity of the soil. When the sensor reaches a resistance set in the microcontroller this will trigger the gate valve to close and signifies wet condition of the soil.

Background/Objectives: A resonator plays a significant part in harnessing sound waves. An idea to use a resonator that only resonates on a specific frequency is hypothesized to harness sound efficiently. The primary objective of this study is to investigate the noise present in the boat engine room and be able to classify its resonant frequency and to know which of these frequencies occur most often. Methods/Statistical analysis: By using a sound recorder and a sound pressure level meter, the sound recorded from the idle state of the boat to disembarking and upon reaching the destination. Findings: Fast Fourier transform is applied to extract the frequencies of the recorded sound. Then the frequencies are evaluated using the Davies-Bouldin index to estimate the number of clusters and K-means clustering to classify the frequencies. Improvements/Applications: There are 2 clusters found and that Cluster 1 frequencies are from 17 Hz to 3295 Hz. Cluster 2 frequencies are from 6291 Hz to 8279 Hz. Among the available frequencies, 47 Hz, 155 Hz, and 186 Hz out weight all of the frequencies in terms of their occurrence, and among the three frequencies, 186 Hz has the highest amplitude.