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전도성 재료를 사용한 도로결빙방지 포장시스템 개발을 위한 기초연구
이강휘(Lee, Kanghwi),이재준(Lee, Jaejun) 한국도로학회 2015 한국도로학회논문집 Vol.17 No.5
PURPOSES : The purpose of this study is to develop a deicing pavement system using carbon fiber or graphite with high electrical conductivity and thermal conductivity. METHODS: Based on literature reviews, in general, conventional concrete does not exhibit electrical and thermal conductivity. In order to achieve a new physical property, experiments were conducted by adding graphite and carbon fiber to a mortar specimen. RESULTS: The result of the laboratory experiment indicates that the addition of graphite can significantly reduce the compressive strength and improve the thermal conductivity of concrete. In the case of carbon fiber, however, the compressive strength of the concrete is slightly increased, whereas, the thermal conductivity is slightly decreased against the plain mortar irrespective of the length of the carbon fiber. In addition, a mixture of the graphite and carbon fiber can greatly improve the degree of heating test. CONCLUSIONS : Various properties of cement mortar change with the use of carbon fiber or graphite. To enhance the conductivity of concrete for deicing during winter, both carbon fiber and graphite are required to be used simultaneously.
생체 신호 측정을 위한 섬유전극의 형태에 따른 전기적 특성 분석 및 비교
이영재(Youngjae Lee),이강휘(Kanghwi Lee),이정환(JeongWhan Lee),강다혜(Dahye Kang),조하경(Hakyung Cho),조현승(Hyunseung Cho),이주현(Joohyeon Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
Many kinds of electrodes have been developed in various forms and shapes for measurement of bio potential signal. Textile electrode has benefit of collect long term data monitoring because of it is non consciousness, convenient and do not occur skin irritation. However, It is very difficult to acquire available data due to high impedance of electrode and unstable skin-electrode contact which generate motion artifact. Also snap button which usually used as mediator between textile and measurement device cause change of electrical characteristics. In this paper, we inflated textile electrode to stabilize contact and add conductive silver paste between textile and snap button to improve conductance. To compare the performance of two methods, flat or inflated and add conductive paste or not, four types of electrodes are tested on each impedance and SNR by ECG measurement. In result, the first type electrode which flat and non-conductive paste showed the worst performance and the last type electrode which is inflated shape and contain conductive paste show the best performance.
Supervised learning에 기반한 돼지 발성음 분류에 관한 연구
민경진(KyoungJin Min),이혁재(HyeokJae Lee),황현진(HyunJin Hwang),이상엽(SangYeob Lee),이강휘(KangHwi Lee),문상호(SangHo Moon),이정은(JungEun Lee),이정환(Jeong Whan Lee) 대한전기학회 2021 전기학회논문지 Vol.70 No.5
This study categorizes the current situation of the pig as supervised learning through the analysis of the pig’s sound. Audio data were obtained from video data obtained by recording at a barn. Speech data was preprocessed to extract features in the time domain and frequency domain, and formants and MFCC were extracted in the frequency domain. Decision Tree, K-Nearest Neighbors, and Support Vector Machine were used for classification, and linear and RBF kernels were used for SVM. The experiment was conducted two times: classifying using features used in Praat and MDVP, which are speech analysis programs, and classifying using MFCC used in speech recognition. After classification, k-fold verification was performed. As a result of the experiment, it can be seen that there is a difference in classification according to the characteristics of using the same voice, and in the case of a situation in which the sound is unified, such as ‘cough,’ the judgment of any classifier is clear. However, in other situations, it is considered necessary to consider the characteristics of pigs by further observing their socialization behavior.