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Development of a Novel Noncontact ECG Electrode by MEMS Fabrication Process
Yeun-Ho Joung,Dakurah Naangmenkpeong Mathias,Jaesoon Park,Eungbo Kim 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
Contact electrodes pose threats like inflammation, metal poisoning, and allergic reaction to the user during longterm ECG procedure. Therefore, we present a novel noncontact electrocardiographic electrode designed throughmicroelectromechanical systems (MEMS) process. The proposed ECG electrode consists of small inner and large outercircular copper plates separated by thin insulator. The inner plate enables capacitive transduction of bio-potentialvariations on a subject’s chest into a voltage that can be processed by a signal processing board, whereas the outerplate shields the inner plate from environmental electromagnetic noise. The electrode lead wires are also coaxiallydesigned to prevent cables from coupling to ground or electronic devices. A prototype ECG electrode has an area ofabout 2.324 cm2, is very flexible and does not require power to operate. The prototype ECG electrode could measureECG at about 500 um distance from the subject’s chest.
Kim, Ji Yeun,Park, Joung Ha,Kim, Min-Chul,Cha, Hye Hee,Jeon, Na-Young,Park, Seong Yeon,Kim, Min-Jae,Chong, Yong Pil,Lee, Sang-Oh,Choi, Sang-Ho,Kim, Yang Soo,Woo, Jun Hee,Kim, Sung-Han Elsevier 2018 The Journal of infection Vol.77 No.4
<P><B>Summary</B></P> <P><B>Objectives</B></P> <P>The IFN-γ-release assay (IGRA) cannot differentiate active tuberculosis (TB) from latent TB infection (LTBI). We hypothesized that the TNF-α-release assay (TARA) combined with IGRA might discriminate active TB from not active TB without LTBI.</P> <P><B>Methods</B></P> <P>Adult patients with suspected TB, and with unrelated diseases such as herpes zoster as controls, were enrolled in an intermediate TB-burden country. Patients with confirmed or probable TB were regarded as active TB, and patients with not active TB were further classified as those having not active TB with and without LTBI based on IGRA results. The IGRA and TARA by using ELISPOT assays were performed on peripheral mononuclear cells.</P> <P><B>Results</B></P> <P>Thirty six patients with active TB and 53 patients including 18 not active TB with LTBI and 35 not active TB without LTBI were finally included. The sensitivity and specificity of the IGRA for those patients found to have active TB were 94% (CI, 80-99) and 66% (CI 52-78), respectively. Combining the IGRA and the TARA substantially increased the specificity for active TB (93%, CI, 82-98; <I>P </I>= 0.001) compared with the IGRA only, without compromising sensitivity (89%, CI, 73-96; <I>P </I>= 0.67).</P> <P><B>Conclusions</B></P> <P>Combining the IGRA and TARA appears to be useful for diagnosing active TB.</P> <P><B>Highlights</B></P> <P> <UL> <LI> IFN-γ release assay (IGRA) cannot differentiate active TB from latent TB infection. </LI> <LI> Combination of IGRA and TNF-α releasing assay (TARA) substantially increased the specificity for active TB (93%). </LI> <LI> Combination assay did not compromise the sensitivity for active TB (89%). </LI> </UL> </P>
손호정 ( Son Ho-jung ),이정아 ( Lee Joung-ah ),한창평 ( Han Chang-pyung ),이성연 ( Lee Seong-yeun ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the heat resistant characteristics of high strength concrete by varied thicknesses of CFT steel plate for 300×300×600 mm RC column member, and has shown the following results. As for the characteristics of unhardened concrete, the air amount and slump flow did not show any difference whether fiber is mixed, however both were shown to satisfy the target range. On the characteristics of hardened concrete, the compression strength by the ages, which is over 83.9 MPa, showed high strength range, and the case where NY+PP(0.05) fiber is mixed in showed a tendency to increase minutely compared to plane where fiber is not mixed in. As for heat resistant characteristics, the cases of 3.0 mm, 4.5 mm and 6.0 mm CFT thicknesses where fiber is not mixed in showed slight improvement of heat resistance as steel plate became thicker, but showed fracture phenomenon, and 6.0 mm thickness CFT where NY+PP(0.05) fiber is mixed in maintained the original look of test body, implying sound condition, which in turn signifies the importance of organic fiber mix-in in CFT structure as well. At this time, main bar highest temperature, 520.8℃, showed relatively good temperature history.
The Effect of Deoxycholic Acid on Secretion and Motility in the Rat and Guinea Pig Large Intestine
( Nam Hee Kim ),( Jung Ho Park ),( Jae-soon Park ),( Yeun-ho Joung ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.4
Background/Aims Bile acid is an important luminal factor that affects gastrointestinal motility and secretion. We investigated the effect of bile acid on secretion in the proximal and distal rat colon and coordination of bowel movements in the guinea pig colon. Methods The short-circuit current from the mucosal strip of the proximal and distal rat colon was compared under control conditions after induction of secretion with deoxycholic acid (DCA) as well as after inhibition of secretion with indomethacin, 1,2-bis (o-aminophenoxy) ethane-N,N,N′,N′-tetra-acetic acid (an intracellular calcium chelator; BAPTA), and tetrodotoxin (TTX) using an Ussing chamber. Colonic pressure patterns were also evaluated in the extracted guinea pig colon during resting, DCA stimulation, and inhibition by TTX using a newly developed pressure-sensing artificial stool. Results The secretory response in the distal colon was proportionate to the concentration of DCA. Also, indomethacin, BAPTA, and TTX inhibited chloride secretion in response to DCA significantly (P < 0.05). However, these changes were not detected in the proximal colon. When we evaluated motility, we found that DCA induced an increase in luminal pressure at the proximal, middle, and distal sensors of an artificial stool simultaneously during the non-peristaltic period (P < 0.05). In contrast, during peristalsis, DCA induced an increase in luminal pressure at the proximal sensor and a decrease in pressure at the middle and distal sensors of the artificial stool (P < 0.05). Conclusions DCA induced a clear segmental difference in electrogenic secretion. Also, DCA induced a more powerful peristaltic contraction only during the peristaltic period. (J Neurogastroenterol Motil 2017;23:606-615)
정태화 ( Tae Hwa Joung ),장성운 ( Sung Woon Chang ),김현철 ( Hyeon Chul Kim ),강석호 ( Suk Ho Kang ),장우섭 ( Woo Sup Chang ),조성우 ( Sung Woo Cho ),이경미 ( Kyung Mi Lee ),박지현 ( Ji Hyeun Park ),오도연 ( Do Yeun Oh ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.4
These are natural inhibitors of coagulation, and deficiencies of any of these factors is referred to as thrombophilia. The identified main causes of thrombophilia are deficiencies of antithrombin Ⅲ, protein C, or protein S, resistance to actived protein C
A Cascaded Multilevel Inverter Using Bidirectional H-bridge Modules
Kang, Feel-Soon,Joung, Yeun-Ho Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.4
This paper presents a multilevel inverter configuration which is designed by insertion of a bidirectional switch between capacitive voltage sources and a conventional H-bridge module. The modified inverter can produce a better sinusoidal waveform by increasing the number of output voltage levels. By serial connection of two modified H-bridge modules, it is possible to produce 9 output voltage levels including zero. There are 24 basic switching patterns with the 9 output voltage levels. Among the patterns, we select the 2 most efficient switching patterns to get a lower switching loss and minimum dv/dt stress. We then analyze characteristics of Total Harmonic Distortion (THD) of the output voltage with variation of input voltage by computer-aided simulations and experiments.
Kim, Sung Yun,Joung, Yeun Ho,Choi, Won Seok Publication Board, Japanese Journal of Applied Phy 2014 Japanese journal of applied physics Vol.53 No.5
In this study, we investigated the low-temperature growth process of carbon nanowalls (CNWs). A microwave plasma-enhanced chemical vapor deposition (PECVD) system was used to grow CNWs on Si and glass substrates using methane (CH4) and hydrogen (H-2) gases. CNWs were synthesized at a substrate temperature of 500 degrees C, and their growth properties depending on their growth time were examined. The vertical and surficial conditions of the grown CNWs depending on the growth temperature were characterized via field-emission scanning electron microscopy (FE-SEM), and the Raman spectroscopy measurements showed structural variations. The optical properties of the CNWs that were synthesized on the glass substrate were analyzed using UV-vis spectroscopy, and it was found that the light transmittance was affected by the form and shape of the CNWs. Energy dispersive spectroscopy (EDS) showed that the CNWs consisted solely of carbon. (C) 2014 The Japan Society of Applied Physics