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Schottky Barrier Tunnel Field-Effect Transistor using Spacer Technique
Kim, Hyun Woo,Kim, Jong Pil,Kim, Sang Wan,Sun, Min-Chul,Kim, Garam,Kim, Jang Hyun,Park, Euyhwan,Kim, Hyungjin,Park, Byung-Gook The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.5
In order to overcome small current drivability of a tunneling field-effect transistor (TFET), a TFET using Schottky barrier (SBTFET) is proposed. The proposed device has a metal source region unlike the conventional TFET. In addition, dopant segregation technology between the source and channel region is applied to reduce tunneling resistance. For TFET fabrication, spacer technique is adopted to enable self-aligned process because the SBTFET consists of source and drain with different types. Also the control device which has a doped source region is made to compare the electrical characteristics with those of the SBTFET. From the measured results, the SBTFET shows better on/off switching property than the control device. The observed drive current is larger than those of the previously reported TFET. Also, short-channel effects (SCEs) are investigated through the comparison of electrical characteristics between the long- and short-channel SBTFET.
Schottky Barrier Tunnel Field-Effect Transistor using Spacer Technique
Hyun Woo Kim,Jong Pil Kim,Sang Wan Kim,Min-Chul Sun,Garam Kim,Jang Hyun Kim,Euyhwan Park,Hyungjin Kim,Byung-Gook Park 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.5
In order to overcome small current drivability of a tunneling field-effect transistor (TFET), a TFET using Schottky barrier (SBTFET) is proposed. The proposed device has a metal source region unlike the conventional TFET. In addition, dopant segregation technology between the source and channel region is applied to reduce tunneling resistance. For TFET fabrication, spacer technique is adopted to enable self-aligned process because the SBTFET consists of source and drain with different types. Also the control device which has a doped source region is made to compare the electrical characteristics with those of the SBTFET. From the measured results, the SBTFET shows better on/off switching property than the control device. The observed drive current is larger than those of the previously reported TFET. Also, short-channel effects (SCEs) are investigated through the comparison of electrical characteristics between the long- and shortchannel SBTFET .
Kim, Tae-Hyeon,Kim, Sungjun,Kim, Hyungjin,Kim, Min-Hwi,Bang, Suhyun,Cho, Seongjae,Park, Byung-Gook Elsevier 2018 Solid-State Electronics Vol.140 No.-
<P><B>Abstract</B></P> <P>In this paper, we investigate the resistive switching behavior of a bipolar resistive random-access memory (RRAM) in a Ni/WO<SUB>x</SUB>/p<SUP>+</SUP>-Si RRAM with CMOS compatibility. Highly unifrom and reliable bipolar resistive switching characteristics are observed by a DC voltage sweeping and its switching mechanism can be explained by SCLC model. As a result, the possibility of metal-insulator-silicon (MIS) structural WO<SUB>x</SUB>-based RRAM’s application to Si-based 1D (diode)–1R (RRAM) or 1T (transistor)–1R (RRAM) structure is demonstrated.</P>
Kim, Sungjun,Lin, Chih-Yang,Kim, Min-Hwi,Kim, Tae-Hyeon,Kim, Hyungjin,Chen, Ying-Chen,Chang, Yao-Feng,Park, Byung-Gook Springer US 2018 NANOSCALE RESEARCH LETTERS Vol.13 No.1
<P>This letter presents dual functions including selector and memory switching in a V/SiO<SUB><I>x</I></SUB>/AlO<SUB><I>y</I></SUB>/p<SUP>++</SUP>Si resistive memory device by simply controlling compliance current limit (CCL). Unidirectional threshold switching is observed after a positive forming with low CCL of 1 μA. The shifts to the V-electrode side of the oxygen form the VO<SUB><I>x</I></SUB> layer, where the threshold switching can be explained by the metal-insulation-transition phenomenon. For higher CCL (30 μA) applied to the device, a bipolar memory switching is obtained, which is attributed to formation and rupture of the conducting filament in SiO<SUB><I>y</I></SUB> layer. 1.5-nm-thick AlO<SUB><I>y</I></SUB> layer with high thermal conductivity plays an important role in lowering the off-current for memory and threshold switching. Through the temperature dependence, high-energy barrier (0.463 eV) in the LRS is confirmed, which can cause nonlinearity in a low-resistance state. The smaller the CCL, the higher the nonlinearity, which provides a larger array size in the cross-point array. The coexistence of memory and threshold switching in accordance with the CCL provides the flexibility to control the device for its intended use.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1186/s11671-018-2660-9) contains supplementary material, which is available to authorized users.</P>
비정상 신호를 가진 연료 펌프의 상태 진단에서 Conv1D 모델의 시간 간격 별 예측 정확성 비교
김형진(Hyungjin Kim),황세윤(Seyun Hwang),김교순(Gyosoon Kim),김경미(Kyungmi Kim),이장현(Jang Hyun Lee) (사)한국CDE학회 2022 한국CDE학회 논문집 Vol.27 No.4
This study deals with the condition detection of centrifugal pump supplying liquid to marine engines. The purpose is to detect the anomaly and the failure modes of the pump by applying the vibration signals from the simulated failures on the experimental bed. Since the pump rarely experiences faults as well as used to degradation experiments, the vibration signal was gathered from an experimental bed simulating the bearings and lubricant failures. Considering the non-stationarity of variable speed, the convolution is applied to extract the feature of time series rather than the frequency feature. The advantage of CNN implicitly extracting features from a non-stationary signal is used to extract the features applied to Conv1D. After learning the features, a multi-layer perceptron (MLP) was connected to failure classification to identify the operation state. Finally, it is suggested that the time series-based feature extraction can be applied to the condition monitoring of a centrifugal pump with variable speed and non-stationarity.
비디오 감시 카메라 내 사물 추적을 통한 골목길 교차로 사고 예방 시스템
김형진 ( Hyungjin Kim ),김준영 ( Juneyoung Kim ),박주홍 ( Juhong Park ),심재욱 ( Jaeuk Shim ),고석주 ( Seokju Ko ),김정석 ( Jeongseok Kim ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.1
길이 좁고 차도와 인도의 구분이 없는 골목길의 특성상 사각지대가 많고 보행자의 동선을 예측하기 힘들어 교통사고가 많이 발생하고 있다. 따라서 본 논문에서는 AI 를 활용, 영상 내 사물을 추적하여 골목길에서의 사고를 예방하는 시스템을 제안한다. 해당 시스템은 Object - Detection & Tracking 을 사용하여 보행자 및 차량을 식별ㆍ추적하여 두 개 이상의 사물이 동시에 교차로에 접근 시 사고 예방 알람을 발생시킨다. 이 시스템을 전국에 설치되어 있는 CCTV 에 활용하면 추가적인 비용과 설치 시간에 제한받지 않고 전국적으로 응용할 수 있을 것으로 기대된다.
( Haeryoung Kim ),( Young-joo Kim ),( Hyungjin Rhee ),( Jeong Eun Yoo ),( Venancio A. F. Alves ),( Gi Jeong Kim ),( Hye Min Kim ),( Paulo Herman ),( Aline Chagas ),( Young Nyun Park ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: The scirrhous variant of hepatocellular carcinoma (S-HCC) and fibrolamellar HCC (FL-HCC) are less common subtypes of HCC that are characterised by abundant fibrous stroma. Here, we aimed to investigate differences in the tumour microenvironment and the tumour epithelial cell characteristics of S-HCC and FL-HCC. Methods: Whole tissue sections of 17 S-HCCs and 9 FL-HCCs were subjected to immunohistochemical stains for K7, K19, EpCAM, CD56/NCAM, CD163, CD68, pSTAT3, FAP, CCN2 and Ki-67. Results: FL-HCC patients were younger than S-HCC patients (p<0.001), and chronic liver disease was seen in the background of 88.2% of S-HCC and in none of the FL-HCC. CD68 and CD163-positive tumour-infiltrating macrophages and FAP-positive cancer-associated fibroblasts (CAFs) were more abundant in the stroma of S-HCCs compared to FL-HCCs (p<0.05, all). Tumour epithelial K19 expression was more frequent in S-HCCs compared to FL-HCCs (p=0.023). Significant positive correlations were seen between pSTAT3 expression status in tumour epithelial cells and CAFs, the extent of stromal CAF and macrophage infiltration and K19 expression status. No significant differences were seen for K7, EpCAM, CD56/NCAM, CCN2 expression and Ki-67 labelling index between S-HCCs and FL-HCCs. Conclusions: S-HCC and FL-HCC are subtypes of HCC with extensive fibrosis, and the nature of the fibrous stroma differs between them. While the stroma of FL-HCC is composed of dense lamellated collage nous bands with sparse cellular components, S-HCC demonstrates more abundant CAF and tumour-infiltrating macrophages, and stemness- related marker expression, suggesting the presence of a complex tumour microenvironment that may influence the aggressive behaviour of these tumours.