Jitthammapirom, Piya
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Preferred name
Jitthammapirom, Piya
Main Affiliation
Email
piya.ji@kmitl.ac.th
3 results
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Item type:Publication, Development of Remote Laboratory for Feedback Control System Class(2021-01-01); ; This research presents a low cost web-based remote laboratory system for a feedback control system class. The system is created by an inexpensive single-board computer (Raspberry Pi 3B+) as laboratory server, an edge of extinct Lego Mindstorms set as a controlled plant, and an IP camera system. The laboratory server based on Ubuntu, which is a free and open-source software and the web application is written with JavaScript based on a MEAN stack platform. The proposed laboratory is used for verifying a design project of the angle control system using Proportional-Integral-Derivative (PID) control. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Toward MLS database system with write downs(2010-12-01); Chittayasothorn, SuphamitMultilevel secure (MLS) database systems are database systems that provide several clearance security levels for users. The clearance levels are attached to each attribute and also attached to tuples. According to current literatures, users whose clearance level is equal to or higher than the clearance level of the data items can read them. Users may write facts and the facts are then accessed by users whose clearance level is higher than or equal to the one who writes. These read and write properties are according to the classic simple security properties proposed by Bell and La Padula. At present, most MLS research works are based on the relational database model. This work intends to create an MLS database system for an intelligence organization. There are many user levels range from Top to Public. Top officers not only would like to see facts entered by lower-level officers but also would like to enter facts to users with different clearance levels under them. Thus write down operations must be allowed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of Grain Size and Film Thickness on the Thermoelectric Properties of Flexible Sb2Te3 Thin Films(2019-01-01); ; In this work, stoichiometric Sb<inf>2</inf>Te<inf>3</inf> thin films with various thicknesses were deposited on a flexible substrate using RF magnetron sputtering. The grain size and thickness effects on the thermoelectric properties, such as the Seebeck coefficient (S), electrical conductivity (σ), power factor (PF), and thermal conductivity (k), were investigated. The results show that the grain size was directly related to film thickness. As the film thickness increased, the grain size also increased. The Seebeck coefficient and electrical conductivity corresponded to the grain size of the films. The mean free path of carriers increases as the grain size increases, resulting in a decrease in the Seebeck coefficient and increase in electrical conductivity. Electrical conductivity strongly affects the temperature dependence of PF which results in the highest value of 7.5 × 10<sup>-4</sup> W/m·K<sup>2</sup> at 250°C for film thickness thicker than 1 μm. In the thermal conductivity mechanism, film thickness affects the dominance of phonons or carriers. For film thicknesses less than 1 μm, the behaviour of the phonons is dominant, while both are dominant for film thicknesses greater than 1 μm. Control of the grain size and film thickness is thus critical for controlling the performance of Sb<inf>2</inf>Te<inf>3</inf> thin films.