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Seunghak Han,Ji Hyung Kim,Yoon Seok Chae,Huu Luong Quach,Yong Soo Yoon,Ho Min Kim 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.4
The low normal zone propagation velocity (NZPV) of high-temperature superconducting (HTS) tape leads to a quench protection problem in HTS magnet applications. To overcome this limitation, various studies were conducted on HTS coils without turn-toturn insulation (NI coils) that can achieve self-protection. On the other hand, NI coils have some disadvantages such as slow charging and discharging time. Previously, the HTS coils with turn-to-turn insulation (INS coils) were operated in power supply (PS) driven mode, which requires physical contact with the external PS at room-temperature, not in persistent current mode. When a quench occurs in INS coils, the low NZPV delays quench detection and protection, thereby damaging the coils. However, the rotary HTS flux pump supplies the DC voltage to the superconducting circuit with INS coils in a non-contact manner, which causes the INS coils to operate in a persistent current mode, while enabling quench protection. In this paper, a new protection characteristic of HTS coils is investigated with INS coils charging through the rotary HTS flux pump. To experimentally verify the quench protection characteristic of the INS coil, we investigated the current magnitude of the superconducting circuit through a quench, which was intentionally generated by thermal disturbances in the INS coil under charging or steady state. Our results confirmed the protection characteristic of INS coils using a rotary HTS flux pump.
Seunghak Lee,Eunjeong Seok,Haeun Kang,Dohyub Park,Minjun Kim,Dayoung Kam,Minsu Choi,Hyung-Seok Kim,Wonchang Choi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Molybdenum sulfide (MoS2) has a 2-D open framework structure and provide delocalized sodium ion diffusionand intercalation within the MoS2 structure. The structure exhibits a high theoretical capacity dueto its wide interlayer spacing (6.2 Å). Therefore, MoS2 has recently been used as an anode material insodium-ion batteries (SIBs). However, it exhibits inferior cycle performance and rate characteristicsdue to its low electronic conductivity and volume change during continuous operation, which restrictits use as an anode material in SIBs. Herein, a MoS2 surface modified with hydrophobic reduced grapheneoxide (rGO-MoS2) was dispersed in silicone oil, which is the starting material for silicon oxycarbide(SiOC), and subsequently used to prepare a MoS2 composite with a SiOC coating-layer surface modifiedwith rGO (rGO-MoS2@SiOC) via single pyrolysis reaction. rGO expands the interlayer spacing of MoS2,improving the electronic conductivity, and the SiOC layer capable of accommodating the volume expansionof MoS2 supports the insufficient buffer layer provided by rGO alone to form a conductive pathwaythat suppressed any adverse reactions at the electrode and electrolyte interface. The rGO-MoS2@SiOCcomposite exhibits a high reversible capacity of 532.5 mAh g1, no capacity fading even after 100 cycles,and superior rate characteristics.
Seunghak Han,Ji Hyung Kim,Yoon Seok Chae,Huu Luong Quach,Yong Soo Yoon,Ho Min Kim 한국초전도저온학회 2021 한국초전도저온공학회논문지 Vol.23 No.4
The low normal zone propagation velocity (NZPV) of high-temperature superconducting (HTS) tape leads to a quench protectionproblem in HTS magnet applications. To overcome this limitation, various studies were conducted on HTS coils without turn-toturn insulation (NI coils) that can achieve self-protection. On the other hand, NI coils have some disadvantages such as slowcharging and discharging time. Previously, the HTS coils with turn-to-turn insulation (INS coils) were operated in power supply(PS) driven mode, which requires physical contact with the external PS at room-temperature, not in persistent current mode. Whena quench occurs in INS coils, the low NZPV delays quench detection and protection, thereby damaging the coils. However, therotary HTS flux pump supplies the DC voltage to the superconducting circuit with INS coils in a non-contact manner, which causesthe INS coils to operate in a persistent current mode, while enabling quench protection. In this paper, a new protection characteristicof HTS coils is investigated with INS coils charging through the rotary HTS flux pump. To experimentally verify the quenchprotection characteristic of the INS coil, we investigated the current magnitude of the superconducting circuit through a quench,which was intentionally generated by thermal disturbances in the INS coil under charging or steady state. Our results confirmedthe protection characteristic of INS coils using a rotary HTS flux pump.
유승학 ( Seunghak Yu ),최민석,윤성로 ( Sungroh Yoon ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
High Throughput Sequencing (HTS) 기술의 발달로 인해 시퀀싱 비용이 감소함에 따라 다양한 분야에서 이를 활용한 융합 연구가 활발하게 진행되고 있다. HTS 기술에서 가장 중요한 부분은 수백만개의 shot read 들을 표준유전체 (reference genome)에 정렬시키는 것인데 RNA 시퀀싱 (RNA-Seq)의 경우 RNA splicing 으로 인해 일반적인 aligner 로 처리가 불가능하다[1]. 복잡한 RNA-Seq 정렬 문제를 해결하기 위해 그동안 다양한 알고리즘들이 제안되어 왔다. 본 논문에서는 RNA-seq 정렬분야에서 잘 알려진 알고리즘들과 최신 알고리즘들을 살펴봄으로써 RNA-seq 정렬 알고리즘의 동향을 살펴보고자 한다.
Geometry Guided Three-Dimensional Propagation for Depth From Small Motion
Shin, Seunghak,Im, Sunghoon,Shim, Inwook,Jeon, Hae-Gon,Kweon, In So IEEE 2017 IEEE signal processing letters Vol.24 No.12
<P>In this letter, we present an accurate Depth from Small Motion approach, which reconstructs three-dimensional (3-D) depth from image sequences with extremely narrow baselines. We start with estimating sparse 3-D points and camera poses via the structure from motion method. For dense depth reconstruction, we propose a novel depth propagation using a geometric guidance term that considers not only the geometric constraint from the surface normal, but also color consistency. In addition, we propose an accurate surface normal estimation method with a multiple range search so that the normal vector can guide the direction of the depth propagation precisely. The major benefit of our depth propagation method is that it obtains detailed structures of a scene without fronto-parallel bias. We validate our method using various indoor and outdoor datasets, and both qualitative and quantitative experimental results show that our new algorithm consistently generates better 3-D depth information than the results of existing state-of-the-art methods.</P>