Due to changes in the form factor of display panels and touch screen panels in various devices, capacitive touch systems have evolved to address various issues such as low power consumption, noise immunity, and small chip size. Furthermore, some devices have applications that use a stylus. Since the stylus operates similarly to a finger touch, it encounters similar issues. Recent research trends focus on addressing key issues such as noise, which is primarily caused by the self-capacitor formed between the display cathode and the touch screen panel. In this paper, Various research papers discussing methods to eliminate external noise will be reviewed. These advancements enhance noise immunity in touch systems, making it easier to use thinner and more flexible panels. These progress make touch technology more versatile and reliable in various applications.
We investigated a SiC-based hydrogen gas sensor with MIS (metal-insulator-semiconductor) structure for high temperature applications. The sensor was fabricated by Pd/TiO2/SiC structure, and a thin titanium dioxide (TiO2) layer was exploited for sensitivity improvement. In the experiment, dependences of I-V characteristics and capacitance response properties on hydrogen gas concentrations from 0 to 2,000 ppm were analyzed at room temperature to 400℃. As the result, our sensor using TiO2 dielectric layer showed possibilities with regard to use in hydrogen gas sensors for high-temperature applications.
Electrode pattern effects on the capacitive humidity sensor were investigated. The fabrication of the capacitive humidity sensor was formed with three steps. The bottom electrode was formed on the silicon substrate with Pt/Ti thin layer by using shadow mask and e-beam evaporator. The photosensitive polyimide was formed on the bottom electrode by using photolithography process as a humidity sensitive thin film. The upper electrode was formed on the polyimide thin film with Pt/Ti thin layer by using e-beam evaporator and lift-off method. Three electrode patterns, such as circle, square, and triangle pattern, were used and changed the sizes to investigate the effects. The capacitances of the sensors were decreased 622 to 584 pF with the area decreament of patterns 250,000 to 196,250 μm2. From these results, a capacitive humidity sensor with photo sensitive polyimide is expected to be applied to a high sensitive humidity sensor.
We investigated a SiC-based hydrogen gas sensor with metal-insulator-semiconductor (MIS)structure for high temperature process monitoring and leak detection applications. The sensor was fabricated by Pd/Ta2O5/SiC structure, and a thin tantalum oxide (Ta2O5) layer was exploited with the purpose of sensitivity improvement, because tantalum oxide has good stability at high temperature as well as high permeability for hydrogen gas. In the experiment, dependence of I-V characteristics and capacitance response properties on hydrogen gas concentrations from 0 to 2,000 ppm was analyzed at room temperature to 500℃. As the result, our sensor exploiting a Ta2O5 dielectric layer showed possibilities with regard to use in hydrogen gas sensors for high-temperature applications.
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A novel NO2 gas sensor based on Hall effect operating at room temperature J. Y. Lin, W. M. Xie, X. L. He, H. C. Wang Applied Physics A.2016;[Epub] CrossRef
A study on capacitive characteristics of stylus pen for touch panel are progressed in this paper. Also the main factors for capacitive sensitivity are studied. Namely, highly sensitive stylus pen which can be applied to capacitive touch panel are studied based on the analysis of materials and process conditions regardless of pattern shapes. Stylus pen was made of PDMS(Poly-Di-Methyl-Siloxane) and conductive metal powders which does not damage the touch panel surface. We tried to get the advantages of both the properties of soft PDMS and conductive metal powders. We found that potential difference of capacitance change with conductivity of the composite materials(PDMS + metal powders) it implies that during touch process, large voltage difference can be caused by the high conductive materials of stylus pen. Stylus pen made by PDMS with mixed with Ag powders which has large conductivity shows more capacitance change of 1 pF than PDMS with other materials of Ni or C powders.
This paper dealt with a partial discharge (PD) detection method for insulation diagnosis in cast-resin transformers. To detect PD pulse, a planar-capacitive probe was designed and fabricated. The probe has no insulation problem and can be installed on cast-resin transformers even in operation since it does not connect with high voltage conductor. The PD measurement system consists of the capacitive probe, a coupling network of 100 [kHz] low-cutoff frequency, and an amplifier with a gain of 40 [dB] and a frequency bandwidth of 500 [Hz]∼45 [MHz]. A plane-needle and a plane-plane electrode system were fabricated to simulate insulation defects in a cast-resin transformer. Sensitivity of the PD measurement system, which is evaluated by a standard calibrator was 0.35 [mV/pC] for positive and 0.45 [mV/pC] for negative, respectively. The PD detection by the capacitive probe was less sensitive than that by a coupling capacitor according to IEC 60270, but we could analyze the magnitude and the phase distribution of PD pulse.
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Machine Learning-Based Partial Discharge Recognition in Cast-resin transformers Using Phase-Synchronized Partial Discharge Detection Technique Gyeong-Yeol Lee, Gyung-Suk Kil Journal of Electrical Engineering & Technology.2026; 21(6): 5147. CrossRef
Nb-embedded Janus WSSe monolayer as a resistive or Schottky gas sensor upon CO, HCHO and C2H3Cl in dry transformers: a first-principles investigation Dan He, Guangming Li, Wen Cao, Hao Cui Physics Letters A.2025; 553: 130669. CrossRef
DFT simulations of Al-doped MoTe
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monolayer as an HCHO and C
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H
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Cl gas sensor for status evaluation of a dry-type reactor in the HVDC converter station
Pei Guo, Chao Xiao, Meng Yao, Yao Liu, Jing Hu, Jian Hu, Tai Li Molecular Physics.2025;[Epub] CrossRef
Fault signature gas sensing by the Ni-dispersed SnS
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monolayer for operation status evaluation of dry-type transformer: a first-principles study
Zhigang Chen, Chaoliang Qi, Xin Chen, YuZhe Bao, Yanan Yang, Fan Zhou Molecular Physics.2025;[Epub] CrossRef
Single Ni Atom-Dispersed WSe2 Monolayer for Sensing Typical Fault Gases in Dry-Type Transformers: A First-Principles Study Yan Liu, Jianben Liu, Zhuo Wei, Tian Yuan, Hao Cui ACS Omega.2023; 8(49): 47067. CrossRef
Implementation of Prediction Program for Deterioration Judgment on Substation Power Systems in Urban Railway Ho-Sung Jung, Young Park, Hyun-Il Kang The Transactions of The Korean Institute of Electrical Engineers.2013; 62(6): 881. CrossRef
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