Advances in Non-Interference Sensing for Wearable Sensors: Selectively Detecting Multi-Signals from Pressure, Strain, and Temperature

정병구,양윤지,오승주 한국센서학회 2023 센서학회지 Vol.32 No.6

Wearable sensors designed for strain, pressure, and temperature measurements are essential for monitoring human movements, healthstatus, physiological data, and responses to external stimuli. Notably, recent research has led to the development of high-performancewearable sensors using innovative materials and device structures that exhibit ultra-high sensitivity compared with their commercialcounterparts. However, the quest for accurate sensing has identified a critical challenge. Specifically, the mechanical flexibility of thesubstrates in wearable sensors can introduce interference signals, particularly when subjected to varying external stimuli and environmentalconditions, potentially resulting in signal crosstalk and compromised data fidelity. Consequently, the pursuit of non-interferencesensing technology is pivotal for enabling independent measurements of concurrent input signals related to strain, pressure, andtemperature, ensuring precise signal acquisition. In this comprehensive review, we present an overview of the recent advances in noninterferencesensing strategies. We explore various fabrication methods for sensing strain, pressure, and temperature, emphasizing theuse of hybrid composite materials with distinct mechanical properties. This review contributes to the understanding of critical developmentsin wearable sensor technology that are vital for their ongoing application and evolution in numerous fields.

農村의 놀이文化

鄭柄九 농촌진흥청 1994 농촌생활과학 Vol.15 No.4

Schiff Base에 의한 구리 부식 억제

정병구,이현석,장영학,문채주 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-

The inhibiting action of copper in 5% hydrochloric acid(HCI) solutions with or without Schiff base, 1,2-bis(naphthylideneimine)ethane(NET), 1,3-bis(naphthylideneimine) propane(NPR), 1,4-bis(naphthylideneimine)butane(NBU), and 1,5-bis(naphthylideneimine) pentane(NPE), has been studied by the Tafel method and AC impedance technique. The corrosion parameters were obtained at different inhibitor concentrations and the temperature effect was also investigated. The inhibiting efficiency increases with a decrease in temperature or increase in concentration of the Schiff base. NPE is the best inhibitor in this series and the maximum inhibition efficiency at a concentration of 5×10^-4 M at 298 K approached 90.07%. Schiff base with longer-chain are superior to shorter-chained analogues in inhibition efficiency.

남녀 성별인식을 위한 음성 특징벡터의 비교

정병구,최재승,Jeong, Byeong-Goo,Choi, Jae-Seung 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.7

본 논문에서는 남성화자 혹은 여성화자인지를 구분하는 성별인식 알고리즘을 제안한다. 본 논문에서는 남성화자와 여성화자의 특징벡터를 분석하며, 이러한 남녀의 특징벡터를 이용하여 신경회로망에 의한 제안한 성별인식에 대한 인식실험을 수행한다. 신경회로망의 입력신호로 사용한 특징벡터로는 10차의 LPC 켑스트럼 계수, 12차의 LPC 켑스트럼 계수, 12차의 FFT 켑스트럼 및 1차의 RMS, 12차의 LPC 켑스트럼 및 8차의 FFT 스펙트럼들이다. 본 실험에서는 특히 12차의 LPC 켑스트럼 및 8차의 저역 FFT 스펙트럼의 특징벡터를 사용하여 20-20-2의 네트워크에 의하여 신경회로망이 학습되었다. 실험결과, 남성화자에 대하여 학습 시에는 평균 99.8%, 여성화자에 대해서는 평균 96.5%의 성별인식률이 구해졌다. This paper proposes a gender recognition algorithm which classifies a male or female speaker. In this paper, characteristic vectors for the male and female speaker are analyzed, and recognition experiments for the proposed gender recognition by a neural network are performed using these characteristic vectors for the male and female. Input characteristic vectors of the proposed neural network are 10 LPC (Linear Predictive Coding) cepstrum coefficients, 12 LPC cepstrum coefficients, 12 FFT (Fast Fourier Transform) cepstrum coefficients and 1 RMS (Root Mean Square), and 12 LPC cepstrum coefficients and 8 FFT spectrum. The proposed neural network trained by 20-20-2 network are especially used in this experiment, using 12 LPC cepstrum coefficients and 8 FFT spectrum. From the experiment results, the average recognition rates obtained by the gender recognition algorithm is 99.8% for the male speaker and 96.5% for the female speaker.

Schift Base에 의한 구리 부식 억제

정병구,이현석,장영학,문채주 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

The inhibiting action of copper in 5 % hydrochloric acid(HCl) solutions with or without Schiff base, l,2-bis(naphthylideneimine)ethane(NET), l,3-bis(naphthylideneimine)propane (NPR), l,4-bis(naphthylideneimine)butane(NBU), and l,5-bis(naphthylideneimine)pentane(NPE), has been studied by the Tafel method and AC impedance technique. The corrosion parameters were obtained at different inhibitor concentrations and the temperature effect was also investigated. The inhibiting efficiency increases with a decrease in temperature or increase in concentration of the Schiff base. NPE is the best inhibitor in this series and the maximum inhibition efficiency at a concentration of 5 × 10 exp (-4) M at 298 K approached 90.07%. Schiff base with longer-chain are superior to shorter-chained analogues in inhibition efficiency.

승인받지 못한 法의 고찰<문제점>

정병구 수원대학교 교지편집위원회 1992 水原大文化 Vol.8 No.-

적응형 전송속도를 갖는 Ku-대역 모노펄스 수신기 설계

정병구,이대홍,주태환 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.7

본 논문에서는 유․무인항공기 추적 등에 사용이 가능하며, 전송속도가 최대 274 Mbps에서도 추적이 가능한 3채널RF 모노펄스 수신기에 대해 설계하였다. 통신용 신호를 이용한 모노펄스 수신기는 Ku-대역으로 설계되었으며, 하향 변환모듈, 신호 처리 모듈로 구성된다. 제안된 RF 모노펄스 수신기의 성능을 만족시키기 위해 전송속도에 따른 전송속도별수신감도의 신호처리 기능이 구현되었고, 이를 위해 다양한 대역폭의 신호 수신 및 상호 주파수 간섭을 최소화하기 위하여 2종의 RF 필터로 구성된 수신기 구조를 적용하였다. 시스템 요구사항의 만족 여부를 확인하기 위해 AWR 시뮬레이션툴을 이용하였다.

셀룰러용 단말기의 포락선 추적 증폭기의 효율 개선회로에 관한 연구

鄭秉九,강인호,심준환,박동국,金柱淵 대한전자공학회 2002 電子工學會論文誌-TC (Telecommunications) Vol.39 No.9

Recently, a envelope tracking(ET) amplifier that improves efficiency by changing of the bias according to the RF input level is presented to use for a high power amplifier of cellular radio handset using CDMA. The input and the output impedances of the ET amplifier may be varied by changing of the bias of the amplifier, and it makes the amplifier having low gain, low efficiency, and high input and output VSWR. In order to improve the input and the output mismatch of the amplifier, in this paper, two types of ET amplifier are suggested. In case of an ET amplifier using varactor diode, in experimentation, gain is improved about 7dB and the power consumption of the amplifier is better about 60% than that of the conventional amplifier. In case of a base voltage controlled ET amplifier, the gain and power consumption of the amplifier is improved about 9dB and 40% than those of the conventional amplifier, respectively. 최근 RF 입력레벨의 크기에 따라 공급되는 바이어스를 변화시켜 효율을 개선하는 포락선 추적 증폭기를 CDMA방식을 채택하는 단말기의 전력증폭기로 사용하려고 시도되고 있다. 그러나 포락선 추적 증폭기는 바이어스가 변함에 따라 증폭기의 입력과 출력 임피던스가 변화되어 이득이 감소하고 효율이 떨어지며 VSWR특성이 악화되는 본질적인 문제가 발생한다. 본 논문에서는 이러한 부정합 문제와 증폭기에서의 이득 및 효율을 개선한 2가지 형태의 포락선 추적증폭기를 제안하였다. 실험적으로 바렉터 다이오드를 이용한 포락선 증폭기의 경우 이득은 약 7dB 개선되었으며, 전력소모는 일반 전력 증폭기에 비해 약 60%개선되었고, 베이스 전압 변화형 포락선 추적 증폭기의 경우 전력 소모는 40%, 이득은 9dB의 개선 효과가 있었다.

생활체육의 시대사적 변화와 전망

정병구 한국체육사학회 1998 체육사학회지 Vol.3 No.-

The main purpose of this study was to consider change of mass sport according to social change. To carry out this purpose the following subsequent questions were studied 1) social change and mass sport 2) mass sport on modern society, 3) future and sport 4) perspetives of mass sport according to periodic differences. Starting from the middle of 1990's, Modern people's concern and intrerests in mass sport along with gradual development of related to sport have been apreading. Especially people's concern and intrerests in mass sport have grown steadily and have been changing according to the social change to the coming 21th century. Social change in modern society find their roots in modernization from social mobility and the disintegration of traditional social values and norms. Accordingly the welfare of the modern people mass sport increasingly become an important aspect of social culture and social institution and research into the relationships between the social change and mass sport has increased. Mass sports is the means of providing a sub cultural foundation to effectively cope with the fast social change to the 21th century, as well as a social means of contributing to the goal of an improved quality of life. On the basis of the literature review, the researcher suggested sport service expansion for the elderly, more opportunities for mass sport participation more accessibility in the community sport facilities, development of mass sport information network, commercialization of mass sport, and environment prevention through sport participation. There is no doubt that coming 21st century will be an information era. Along with this social trend, the individual and social needs for the mass sport will increase. This study reviewed the mass sport trends as shown by contemporary society and substantiate the need for the long-term planning and strategy for the mass sport demands and supplies.

1% SLS 음이온 계면활성제를 함유한 샴푸가 모발의 손상에 미치는 영향

정병구(Byeong-Goo Jeong),전정애(Jeong-Ae Jeon),전선복(Seon-Bok Jeon) 한국인체미용예술학회 2012 한국인체미용예술학회지 Vol.13 No.2

Anion surfactant, sodium lauryl sulfate (SLS) has been used in shampoo for cleaning. Virgin hair which was not chemically treated was collected from the scalp at the back of the head of an 18-year-old woman. The hair damage of the sample hair was measured by putting the sample in the 1% SLS shampoo solution. The measuring areas were chromaticity, tensile strength and activation energy in protein isothermal curve. The brightness L of the sample hair was (22.2±0.51) before being put in the 1% SLS shampoo solution. But after being in the solution, the figure became significantly higher at (23.5±0.54), (p<0.05). This implies that anion surfactant SLS causes hair damage and influences brightness L. The tensile strength of the sample hair was (137.5±4.36 g) before being in the 1% SLS shampoo solution. But the figure became low, (148.3±3.16 g), after being in the solution (p<0.05). This indicates that anion surfactant SLS causes modification in keratin protein and lowers tensile strength. Finally, the activation energy of the sample hair in the 1% SLS shampoo solution was (59.2±4.61 kJ/㏖) 21% lower than that of the sample in the aqueous solution (55.5±3.40 kJ/㏖), (p<0.05). By measuring brightness, tensile strength and activation energy of the sample hair in the 1% shampoo solution to check hair damage, it has been determined that anion surfactant SLS causes damage to virgin hair. Rinsing hair thoroughly after shampooing, not leaving any residue on hair and using hair protection products including rinses and treatments are recommended.