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A 0.5-2.0 GHz Dual-Loop SAR-controlled Duty-Cycle Corrector Using a Mixed Search Algorithm
Han, Sangwoo,Kim, Jongsun The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.2
This paper presents a fast-lock dual-loop successive approximation register-controlled duty-cycle corrector (SARDCC) circuit using a mixed (binary+sequential) search algorithm. A wider duty-cycle correction range, higher operating frequency, and higher duty-cycle correction accuracy have been achieved by utilizing the dual-loop architecture and the binary search SAR that achieves the fast duty-cycle correcting property. By transforming the binary search SAR into a sequential search counter after the first DCC lock-in, the proposed dual-loop SARDCC keeps the closed-loop characteristic and tracks variations in process, voltage, and temperature (PVT). The measured duty cycle error is less than ${\pm}0.86%$ for a wide input duty-cycle range of 15-85 % over a wide frequency range of 0.5-2.0 GHz. The proposed dual-loop SARDCC is fabricated in a 0.18-${\mu}m$, 1.8-V CMOS process and occupies an active area of $0.075mm^2$.
In-Service Monitoring of Stator-Slot Magnetic Wedge Condition for Induction Motors
Han, Sangwoo,Jung, Junyeong,Lee, Kun Wang,Lee, Sang Bin,Nandi, Subhasis,Kim, Byunghwan,Kang, Byunghee [Institute of Electrical and Electronic Engineers] 2016 IEEE transactions on industry applications Vol.52 No.4
<P>Stator-slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high-output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly reported. Although missing wedges can deteriorate motor performance and reliability, there is currently no test method accepted in the field for wedge quality assessment other than offline, disassembled visual inspection. In this paper, a new in-service method for monitoring the magnetic wedge condition in induction motors based on the negative-sequence information is proposed. The new method is developed based on the analysis of the dynamic model of the induction motor with missing magnetic slot wedges, derived in this paper. The proposed method is verified on a finite-element (FE) model of a 6.6-kV, 1850-kW induction motor. It is also verified experimentally on a 6.6-kV, 220-kW induction motor operating in the field with missing wedges (before and after rewedging), and on a 380-V, 5.5-kW induction motor with custom-built, removable magnetic wedges. It is shown that the proposed method can provide online detection of missing magnetic wedges, which can help reduce maintenance costs and risk of degradation in motor performance.</P>
Sangwoo Han,Joohee Choung,Juho Kim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In this paper, the power gating using a cluster-based MTCMOS(Multi-Threshold CMOS) technique is proposed. MTCMOS can efficiently reduce the leakage current when a circuit is in the standby state. The proposed method considers the transition frequency of gates which represents how frequently a part of circuit is used and the path information of gates to optimize the size of sleep transistor. The method is experimented with Nangate freePDK 45nm model library on various circuits. The results were compared with ST-free design which does not use the sleep transistor and the previous method which does not consider the path information and transition frequency of circuit. The result shows that the new method in this thesis was 75% more effective than ST-free structure and 5.3% more effective than previous method on the average for reduction of leakage power. In addition, the reduction of sleep transistor area was 28.3%.
A 0.5–2.0 GHz Dual-Loop SAR-controlled Duty-Cycle Corrector Using a Mixed Search Algorithm
Sangwoo Han,Jongsun Kim 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.2
This paper presents a fast-lock dual-loop successive approximation register-controlled dutycycle corrector (SARDCC) circuit using a mixed (binary+sequential) search algorithm. A wider dutycycle correction range, higher operating frequency, and higher duty-cycle correction accuracy have been achieved by utilizing the dual-loop architecture and the binary search SAR that achieves the fast dutycycle correcting property. By transforming the binary search SAR into a sequential search counter after the first DCC lock-in, the proposed dual-loop SARDCC keeps the closed-loop characteristic and tracks variations in process, voltage, and temperature (PVT). The measured duty cycle error is less than ±0.86 % for a wide input duty-cycle range of 15?85 % over a wide frequency range of 0.5?2.0 GHz. The proposed dual-loop SARDCC is fabricated in a 0.18-μm, 1.8-V CMOS process and occupies an active area of 0.075 mm².
Self-assembly of tumor-targeting RNA nanoball for carrier-free delivery of therapeutic RNA
Han, Sangwoo,Lee, Jong Bum Elsevier 2018 Journal of industrial and engineering chemistry Vol.64 No.-
<P><B>Abstract</B></P> <P>Rolling circle transcription (RCT) has been studied for enhancing the delivery efficiency of therapeutic RNA by densely packing RNA strands with particle formation. This facile fabrication method has been successfully employed to generate RNA nanoballs containing functional short interference RNA. In addition, the nanoballs produced by RCT showed high stability from the nuclease degradation. With these advantages, using biotin-labeled ribonucleoside triphosphate (rNTP), target specific and non-toxic bubble RNA nanoball (BNB) was synthesized. To achieve tumor-targeting, epidermal growth factor receptor antibody (EGFR Ab) was used to target the tumor cells by labeling the target ligands with biotin–avidin interaction. Target gene silencing by EGFR Ab-labeled RNA nanoball was confirmed <I>in vitro</I>. Therefore, RNA nanoball can be utilized for tumor cell-targeting delivery of therapeutic RNA.</P> <P><B>Graphical abstract</B></P> <P>Novel tumor-targeted siRNA delivery system was developed with rolling circle transcription (RCT) and biotin–streptavidin interaction for target gene suppressing effect.</P> <P>[DISPLAY OMISSION]</P>
SangWoo Han,Inha Hwang,Seung Min Kim,Young Soon Yang,SangWon Ha,Jeong Ho Han,Tae Hwan Park 대한직업환경의학회 2016 대한직업환경의학회지 Vol.28 No.-
Background: Agent Orange (AO) is the code name for one of the herbicides and defoliants used in the Vietnam War. Studies conducted thus far show a significant correlation between AO and the occurrence of cardiovascular diseases. But there is little data on the association between AO and stroke, and limited studies have targeted patient groups exposed to AO. Method: Bohun medical center Institutional Review Board (IRB) approved the study. (ID: 341) We studied patients with acute ischemic stroke within 7 days of onset in VHS medical center and 4 other general hospitals. Among them, 91 consecutive patients with previous exposure to AO were evaluated. For controlled group, 288 patients with no history of AO exposure were chosen. Result: There were 49 (44.0 %) DM patient with a higher frequency in the exposure group (93 (32.3 %) in control P = 0.045). There were 6 (6.6 %) hyperlipidemia in exposure group and 69 (24.0 %) in control. (P < 0.002). Small vessel occlusion was the most common subtype (36, 39.6 %) in exposure group but in control group, the large artery atherosclesosis was (120, 41.7 %) (P = 0.014). The NIHSS of the exposure group on admission showed lower scores (median values, 2 and 4, respectively; P = 0. 003). The median mRS was 1 for the exposure group and 2 for the control group, at discharge and after 3 months. After 3 months of discharge, 55 (60.4 %) in the exposure group and 171 (59.4 %) in the control group showed below mRS 1 (P = 0.001). Conclusion: This study targeted patients who are Vietnam veteran. There is some difference in vascular risk factors and clinical manifestations suggest AO exposure has contributed to a certain extent to the stroke.
An Accurate Gate-level Stress Estimation for NBTI
Han, Sangwoo,Lee, Junho,Kim, Byung-Su,Kim, Juho The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.2
Negative bias temperature instability (NBTI) has become a major factor determining circuit reliability. The effect of the NBTI on the circuit performance depends on the duty cycle which represents the stress and recovery conditions of each device in a circuit. In this paper, we propose an analytical model to perform more accurate duty cycle estimation at the gate-level. The proposed model allows accurate (average error rate: 3%) computation of the duty cycle without the need for expensive transistor-level simulations Furthermore, our model estimates the waveforms at each node, allowing various aging effects to be applied for a reliable gate-level circuit aging analysis framework.