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자동제어 측정 시스템을 이용한 생체 조직의 임피던스 평가
길상형(Sang-Hyeong Kil),이무석(Moo-Seok Lee),김상식(Sang-Sik Kim),신동훈(Dong-Hoon Shin),이성모(Seong-Mo Lee),김군도(Gun-do Kim),이종규(Jong-Kyu Lee) 한국비파괴검사학회 2015 한국비파괴검사학회지 Vol.35 No.4
생체 조직은 세포 배열이나 조직 형태 등 다양한 차이에 의해 각각 고유의 전기적 특성을 가지며, 생물학적 변화가 일어나면 고유의 전기적 특성이 변한다. 본 연구는 방사선 피폭에 따른 생체 조직의 전기적 특성 변화를 측정하기 위한 선행연구로 측정 과정에서 방사선 피폭 우려가 있으므로, 실험자의 방사선 장애를 방지하기 위해 LabVIEW를 이용하여 자동제어 측정 시스템을 개발한 후 생체 조직의 특성을 평가하고자 하였다. 생체 조직의 전기적 특성 측정전·후 형태학적 변화를 관찰한 결과 조직 변화는 관찰되지 않았으며, 유사한 양상이었다. Impedance/Gain-phase analyzer로 생체 조직의 임피던스를 반복 측정한 결과 변동계수가 10% 미만으로 측정값은 재현성이 있었다. 주파수 변화에 따른 생체 조직의 전기적 특성 중에서 위상차 변화는 거의 없었으며, 조직은 저항성을 나타내었고, 임피던스 크기는 주파수에 비례하여 일정하게 감소하였다. 본 연구를 통해 생체 조직의 전기적 특성 변화를 측정할 수 있는 자동제어 시스템을 개발하였으며, 생체 조직의 전기적 특성을 이해할 수 있었다. Each biological tissue has endemic electrical characteristics owing to various differences such as those in cellular arrangement or organization form. The endemic electrical characteristics change when any biological change occurs. This work is a preliminary study surveying the changes in the electrical characteristics of biological tissue caused by radiation exposure. For protection aganinst radiation hazards, therefore the electrical characteristics of living tissue were evaluated after development of the automatic control measurement system using LabVIEW. No alteration of biological tissues was observed before and after measurement of the electrical characteristics, and the biblogical tissues exhibited similar patterns. Through repeated measurements using the impedance/gain-phase analyzer, the coefficient of variation was determined as within 10%. The reproducibility impedance phase difference in electrical characteristics of the biological tissue did not change, and the tissue had resistance. The absolute value of impedance decreased constantly in proportion to the frequency. It has become possible to understand the electrical characteristics of biological tissues through the measurements made possible by the use of the developed. automatic control system.
Effect of V Addition on Hardness and Electrical Conductivity in Cu-Ni-Si Alloys
한승전,J. H. Gu,이재현,Z. P. Que,J. H. Shin,임성환,김상식 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
The effect of vanadium (V) addition on the microstructure, the hardness and the electrical conductivity of Cu-2.8Ni-0.7Si alloys was investigated. The V-free, the 0.1 wt% V-added, the 0.2 wt% V-added Cu base alloys were exposed to the same experimental conditions. After the cold rolling of the studied alloys, the matrix was recrystallized during the solution heat treatment at 950 °C for 2 h. However, small amounts of vanadium substantially suppressed the recrystallization and retarded the grain growth of the Cu base alloys. The added vanadium accelerated the precipitation of Ni2Si intermetallic compounds during aging and therefore it contributed positively to the resultant hardness and electrical conductivity. It was found that the hardness and the electrical conductivity increased simultaneously with increasing aging temperature and time with accelerated precipitation kinetics by the addition of vanadium. In the present study, the Cu-2.8Ni-0.7Si alloy with 0.1 wt%V was found to have an excellent combination of the hardness and the electrical conductivity when it was aged at 500 °C.
민통선,비무장지대(DMZ)일대의 식생에 관한 연구 -동해 북부선 지역을 중심으로-
김창환 ( Chang Hwan Kim ),김귀곤 ( Kwi Gon Kim ),최영은 ( Young Eun Choi ),김상식 ( Sang Sik Kim ),신중열 ( Jung Ryeul Shin ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.6
In this study, wetlands and forest vegetation surrounding rail, road of DMZ area and Civilian Control Line were studied as follows: Plant communities hierarchical system of forest vegetation classified according to the results of phytosociological methods of Braun-Blanquet (1964) as; Quercus mongolica community, Quercus mongolica-Quercus variabilis community and Quercus acutissima-Quercus mongolica community. Wetland vegetation major communities; Scirpus wichurae community, Scirpus fluviatilis community, Juncus effusus var. decipiens community, Typha orientalis community, Typha angustata community, Juncus alatus community, Miscanthus sacchariflorus community, Phragmites communis-Miscanthus sacchariflorus community, Hragmites communis community, Phragmites communis-Alnus japonica community, Alnus japonica community, Phragmites japonica community, Salix koreensis community, Prunus padus community, Alnus japonica community, Zizania latifolia community and Amorpha fruticosa community were surveyed. Coastal sand dune vegetation in a DMZ area and the Civilian Control Line was mainly characterized by; Carex pumila, Elymus mollis, Carex kobomugi, Rosa rugosa, Calystegia soldanella, Lathyrus japonica and Aster hispidus, species that are of typically sand dune vegetation.
미세 플라스틱 측정을 위한 MEMS 기반 미세유체 구조와 고주파 전송특성을 이용한 전극이 결합된 센서 연구
김진형(JinHyoung Kim),이권홍(Kwonhong Lee),신규식(Kyusik Shin),김상식(Sangsik Kim),구승현(Seunghyeon Koo),최자인(Jain Choi),차철웅(Cheolung Cha) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Recently, as environmental problems have grown, and among them, fine particles such as fine dust/fine plastic have become a problem, research on fine particle sensors is being actively conducted. In previous studies, the form of simply concentrating fine particles at a high concentration and putting them into a trapping space for measurement was used, and sensors with a structure of reading changes in S-parameters, especially reflection coefficient (S11), at a specific frequency using LC resonance were proposed. This form is not favorable for measuring fine particles that exist in extremely low concentrations in real-life environments. While the structure of reading reflection coefficient (S11) may be convenient for reading with commercial measurement equipment such as a Network Analyzer, it is advantageous to read transmission coefficient (S21) for commercialization. In this study, we captured lowconcentration fine particles dispersed in liquid using MEMS-based microfluidics and filter structures, thereby improving the sensitivity. Additionally, we designed the sensor to read transmission coefficient (S21) instead of reflection coefficient (S11) to increase commercial feasibility. As a result, we designed a fine particle measurement sensor with a center frequency of 1.2 GHz, and confirmed that the frequency shifted from 1.2028 GHz to 1.1929 GHz by inputting microplastics (PE).