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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.
Lee, Jungryun,Song, Kiyeong,Lee, Kyoobin,Hong, Joohyeon,Lee, Hyojung,Chae, Sangmi,Cheong, Eunji,Shin, Hee-Sup National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.50
<P>T-type Ca<SUP>2+</SUP> channels in thalamocortical (TC) neurons have long been considered to play a critical role in the genesis of sleep spindles, one of several TC oscillations. A classical model for TC oscillations states that reciprocal interaction between synaptically connected GABAergic thalamic reticular nucleus (TRN) neurons and glutamatergic TC neurons generates oscillations through T-type channel-mediated low-threshold burst firings of neurons in the two nuclei. These oscillations are then transmitted from TC neurons to cortical neurons, contributing to the network of TC oscillations. Unexpectedly, however, we found that both WT and KO mice for <I>Ca<SUB>V</SUB>3.1</I>, the gene for T-type Ca<SUP>2+</SUP> channels in TC neurons, exhibit typical waxing-and-waning sleep spindle waves at a similar occurrence and with similar amplitudes and episode durations during non-rapid eye movement sleep. Single-unit recording in parallel with electroencephalography in vivo confirmed a complete lack of burst firing in the mutant TC neurons. Of particular interest, the tonic spike frequency in TC neurons was significantly increased during spindle periods compared with nonspindle periods in both genotypes. In contrast, no significant change in burst firing frequency between spindle and nonspindle periods was noted in the WT mice. Furthermore, spindle-like oscillations were readily generated within intrathalamic circuits composed solely of TRN and TC neurons in vitro in both the KO mutant and WT mice. Our findings call into question the essential role of low-threshold burst firings in TC neurons and suggest that tonic firing is important for the generation and propagation of spindle oscillations in the TC circuit.</P>
Lee, Joohyeon,Im, Jeong Hyuk,Huh, Kang Moo,Lee, Yong-kyu,Shin, Heungsoo American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>The final goal of this study is to develop multi-functional organic/inorganic hybrid nanoparticles, which can be utilized as biomedical imaging probes and drug delivery carriers. As an initial step toward this goal, we encapsulated CdSe/ZnS quantum dots (QDs) into poly(ethylene glycol)-b-poly(D,L-lactide) (PEG-PLA) micelles using a solid dispersion method. The size and fluorescent intensity of QDs encapsulated in PEG-PLA micelles depended on the amount of incorporated QDs. For example, when the amount of QDs increased from 0.1 to 1.0 microg, the mean diameter increased from 24.2 +/- 6.0 to 211.2 +/- 6.5 nm and the fluorescent intensity changed from 10.2 +/- 1.0 to 469.9 +/- 15.6 (RFU). Stability studies showed that the size and zeta-potential (ZP) of QDs encapsulated in PEG-PLA micelles (QEMs) did not change significantly in response to a change in pH conditions or under a 10% serum condition. We also tested the cytotoxicity and cellular uptake of the QEMs. The viability of HeLa cells treated with micelles for 24 h was 80-100% in various concentration ranges of micelles. Confocal laser scanning microscopic images showed that the QEMs penetrated into the cells, particularly into the cytosolic compartments. Our results suggest that the QEMs may be a promising multi-functional nanocarrier for biomedical imaging and drug delivery.</P>
이영진(Lee youngjin),이주현(Lee joohyeon) 한국색채학회 2011 한국색채학회 논문집 Vol.25 No.3
디지털 컨버젼스 환경이 급속히 발달하면서 관련 기술을 사용하여 인간의 삶을 보다 편리하게 하면서 감성적인 만족을 추구하는 경향이 의식주 분야 전반에 걸쳐 나타나고 있다. 이러한 흐름의 예로 의류 분야에서는 디지털 기능을 의복에 포함시킨 스마트 의류의 발달을 들 수 있다. 스마트의류는 디지털 환경과 소통하면서 인간에게 편의를 제공하는 신 기능성 의류로 선진국을 중심으로 다양한 애플리케이션의 의류들이 개발되고 있다. 스마트 의류의 다양한 애플리케이션 중 디지털 컬러 의류는 인간의 즐거움에 관한 감성을 충족시키며 동시에 패션 제품의 심미성을 높여 착용자의 만족도를 높을 수 있는 새로운 표현의 장르이다. 또한, 의류가 가지는 패션성의 속성과 가장 합치하므로 디지털 컬러 의류의 발전 가능성은 충분하다고 볼 수 있을 것이다. 따라서 패션과 디지털 컬러 의류에 관한 구현 방법과 접목은 매우 필요하다고 하겠다. 본 연구에서는 디지털 컬러 의류를 정의하고 디지털 컬러 의류의 연구 동향과 디자인 프로세스 모형 및 프로토타입을 제시하고 관련 섬유 기술 및 전자 패키징 기술을 고찰하여 상용화를 위한 기반이 되고자 하였다. 본 연구에서는 디지털 컬러 의류의 현재까지 개발된 프로토타입을 제시하고 앞으로의 발전 방향에 대하여 논하고자 한다. 현재 디지털 컬러 의류는 독자적인 응용 프로토타입부터 다양한 어플리케이션에 부분적인 적용에 이르기까지 그 영역이 점차 넓어지고 있으며 그에 수반한 다양한 기술이 개발되고 있어 그에 따른 적용방안과 제반 연구가 요구되어진다. As the rapid development of digital convergence environment, throughout our lives, the lives of human-related technology easier to use and tend to seek emotional satisfaction, are appearing. An example of this trend, the digital features clothing apparel sector was included in the development of smart clothing can be. Smart clothing with the digital environment to provide convenience to humans when communicating new functional clothing, and a variety of applications in developed countries, mainly garments are being developed. Of various applications of smart clothing clothing digital color is the new genre. Because of the enjoyment of human emotion meets the aesthetic of fashion products at the same time increase the wearer’s satisfaction, because the increase. In addition, the kinds of clothing and fashion, because of the properties and the most consistent growth potential of digital color clothing will be considered sufficient. Therefore, the digital color clothes on fashion and how to implement and apply its will be very necessary. In this study, the definition digital color garment and its trends, and design process models and prototypes were presented. And, related to study textile technology and electronics packaging technologies has become the foundation for the commercialization. In this paper, digital color clothing so far developed a prototype of the proposed future direction of development will be discussed. Current digital color clothing from their own application prototype for a variety of applications ranging from partial effect gradually widen the area and it entailed a variety of techniques have been developed and applied accordingly, and various research methods is needed.