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Exploratory Research on Muscle Activity by Using fNIRS
( Jaewook Jin ),( Dahee Yoon ),( Sun-mi Choi ),( Woun-shik Kim ),( Jaeuk U. Kim ) 한국감성과학회 2023 한국감성과학회 국제학술대회(ICES) Vol.2023 No.-
Functional Near-Infrared Spectroscopy (fNIRS) is a valuable tool for real-time emotion detection. This study explores the role of the Prefrontal Cortex, with a focus on blood flow changes induced by eye blinking in the Fp1 and Fp2 areas. Using Artinis Brite, four optodes were positioned based on the International 10-20 system. Participants executed left and right eye blinks, revealing distinct patterns of oxyhemoglobin. Fp1 exhibited increased activation during left blinks, while Fp2 demonstrated higher activation during right blinks. These findings challenge previous cognitive-centric fNIRS studies by highlighting responses related to facial muscles. Detecting emotions through eye movements provides efficient, non-intrusive emotional analysis, which is crucial for human-AI interactions and metaverse experiences. This innovative approach demonstrates real-time emotional monitoring using minimal sensors. This breakthrough enables accurate emotion detection without intrusive measures, advancing the field of emotional neuroscience.
Jaewook Lee,Sungwoo Jun,Jaeman Jang,Hagyoul Bae,Hyeongjung Kim,Jong Won Chung,Sung-Jin Choi,Dae Hwan Kim,Jiyoul Lee,Dong Myong Kim IEEE 2013 IEEE electron device letters Vol.34 No.12
<P>We report a fully subthreshold current-based technique for characterization of subgap density of states [DOS:g(E)] with consistent mapping of the surface potential (ψ<SUB>S</SUB>) in p-channel polymer-based thin-film transistors (PTFTS). Initially, we propose a technique for extraction of the DOS over the bandgap using the gate voltage (V<SUB>GS</SUB>)-dependent ideality factor [m(V<SUB>GS</SUB>)] from the transfer characteristics of the PTFTs under subthreshold operation. We also propose a technique for a consistent nonlinear mapping of V<SUB>GS</SUB> to the subgap energy level by converting m(V<SUB>GS</SUB>) to ψ<SUB>S</SUB>. Through combining the two methods, the exponential tail and deep g(E) are obtained to be N<SUB>TD</SUB>=1·1×10<SUP>17</SUP> [eV<SUP>-1</SUP>·cm<SUP>-3</SUP>], kT<SUB>TD</SUB>=0·035 [eV], N<SUB>DD</SUB>=9·8×10<SUP>16</SUP> [eV<SUP>-1</SUP>·cm<SUP>-3</SUP>], and kT<SUB>DD</SUB>=0·80 [eV] over the bandgap.</P>
Development of Performance Demonstration Laboratory for Engineered Barrier System in KAERI
Jaewook Ahn,Taehyun Kim,Chang-Ho Hong,Jin-Seop Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
The engineered barrier system (EBS), composed of spent nuclear fuel, canister, buffer and backfill material, and near-field rock, plays a crucial role in the deep geological repository for high-level radioactive waste. Understanding the interactions between components in a thermo-hydro-mechanical -chemical (THMC) environment is necessary for ensuring the long-term performance of a disposal facility. Alongside the research project at KAERI, a comprehensive experimental facility has been established to elucidate the comprehensive performance of EBS components. The EBS performance demonstration laboratory, which installed in a 1,000 m2, consists of nine experimental modules pertaining to rock mechanics, gas migration, THMC characteristics, buffer-rock interaction, buffer & backfill development, canister corrosion, canister welding, canister performance, and structure monitoring & diagnostics. This facility is still conducting research on the engineering properties and complex interactions of EBS components under coupled THMC condition. It is expected to serve as an important laboratory for the development of the key technologies for assessing the long-term stability of engineered barriers
Jaewook Lee,Jaeman Jang,Hyeongjung Kim,Jiyoul Lee,Bang-Lin Lee,Sung-Jin Choi,Dong Myong Kim,Dae Hwan Kim,Kyung Rok Kim IEEE 2014 IEEE electron device letters Vol.35 No.3
<P>The physical origins of the negative-bias stress (NBS) instability in polymer-based thin-film transistors have been characterized. Through the quantitative analysis by TCAD simulation for the NBS time-dependent experimental results, the threshold voltage (V<SUB>T</SUB>)-shift by sub-bandgap density-of-states redistribution forms 70% and 78% for the measured total V<SUB>T</SUB>-shift while V<SUB>T</SUB>-shift by gate oxide charge trapping only takes 30% and 22% at NBS time of 3000 and 7000 s, respectively. In addition, the increase of source/drain Schottky contact resistance (R<SUB>SD</SUB>) is the main reason for NBS-induced on -current (I<SUB>ON</SUB>) degradation.</P>
MOSFET-Like Behavior of a-InGaZnO Thin-Film Transistors With Plasma-Exposed Source–Drain Bulk Region
Jaewook Jeong,Yongtaek Hong,Jae Kyeong Jeong,Jin-Seong Park,Yeon-Gon Mo IEEE 2009 Journal of display technology Vol.5 No.12
<P>In this paper, we analyzed electrical characteristics of amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistor (TFT) with plasma-exposed source-drain (S/D) bulk region. The parasitic resistance and effective channel length characteristics exhibit similar behavior with that of crystalline silicon metal oxide-semiconductor field effect transistor (c-Si MOSFET) that has doped S/D bulk region. The transfer curves little changed with gate overlap variation, and the width-normalized parasitic resistance obtained from transmission line method was as low as 3 to 6 Omegamiddotcm. The effective channel length was shorter than the mask channel length and showed gate-to-source (V<SUB>GS</SUB>) voltage dependency that is frequently observed for lightly doped drain (LDD) MOSFET. Experimental and simulation results showed that the plasma exposure caused an LDD-like doping effect in the S/D bulk region by inducing oxygen vacancy in the a-IGZO layer.</P>
Transfer-printable micropatterned fluoropolymer-based triboelectric nanogenerator
Ha, Jaewook,Chung, Jihoon,Kim, SeongMin,Kim, Jong Hun,Shin, Seungmin,Park, Jeong Young,Lee, Sangmin,Kim, Jin-Baek Elsevier 2017 Nano energy Vol.36 No.-
<P><B>Abstract</B></P> <P>Triboelectric nanogenerators (TENG) are increasingly considered as a promising energy harvesting system due to high output performance from various wasted energy sources. Numerous studies addressing the TENG configuration improve the performance of these devices by optimizing the paired triboelectric materials and structural geometry. Here, poly(1<I>H</I>,1<I>H</I>,2<I>H</I>,2<I>H</I>-perfluorodecyl methacrylate) (PFDMA) fluoropolymer is adopted as a novel negative tribo-material for application to a TENG, as it is at the topmost negative position of the triboelectric series and it is possible to tune the surface roughness under mild conditions. The intrinsic properties are examined and systematic measurements are carried out with the goal of applying the material to a TENG. PFDMA is suitable for application to a TENG, because PFDMA-TENG exhibits a high voltage, current, and power density of 68V, 6.68μA, and 150μW, respectively, under a load of 500MΩ. Moreover, a PFDMA film offers two distinctive advantages making it ideal for application to a TENG: transmittance higher than 98% even with a relatively high surface roughness, and transfer printing on diverse substrates. The results indicate that PFDMA is a novel negative tribo-material candidate for the fabrication of a TENG with superior triboelectric performance by controlling the surface charge density and morphology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The new PFDMA shows strategy of fabricating roughened surface under mild condition.. </LI> <LI> This is the first analysis on effective work function and electrical output of PFDMA. </LI> <LI> The super-hydrophobic surface of PFDMA shows energy harvesting from water drops. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee Jaewook,Ahn Jin Hwan,Lee Ingyu,Cho Yongun 대한정형외과 스포츠의학회 2020 Arthroscopy and Orthopedic Sports Medicine Vol.7 No.1
We report a case of pathologic bilateral impingement of the posterior cruciate ligament (PCL) synovial folds referred to PCL plicae. A 40-year-old female was admitted to the hospital with vague bilateral knee pain along the medial side of both knees just below each patella. She reported that standing for long periods of time increased the pain and that it has been more than 10 years since the vague pain occurred. On magnetic resonance imaging, medial synovial folds of the PCL were identified and therefore knee arthroscopy was performed under general anesthesia. The arthroscopic findings revelated entrapped folds within the medial tibiofemoral joints when the knees were in passive extension. The entrapped tissue of the synovial folds was resected by punch forceps and debrided by a shaver. After eight months of surgery, the patient’s symptoms completely resolved, and she regained full range of motion. The long medial synovial folds around the PCL can be a cause of knee pain due to entrapment between the femoral and tibial condyles. Plicae pathologies can therefore be considered one of the differential diagnosis of vague knee pain.