http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Double Walker Breakdown of Ultrathin Magnetic Double Layers
Jaesung Yoon,Joon Moon,Kitae Kim,Seong-Hyub Lee,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
There are a lot of studies that have been proceeded about domain wall dynamics at magnetic thin films to make better magnetic memory devices. Particularly, many people largely focus on how to make the domain wall move effectively using perpendicular magnetic anisotropy (PMA), Dzyaloshinskii-Moriya interaction (DMI), spin-orbit coupling effect, etc. Since these phenomena are mostly generated at the interfaces adjacent to the magnetic layers, the magnetic multilayered structures which have multiple interfaces have drawn great attention. For this study, we make magnetic double layers (Ta (5nm) / Pt (2.5nm) / Co (Xnm) / Pt (Ynm) / Co (Znm) / Pt (1.5nm)) using DC magnetron sputtering. And then, we measure the field-driven domain wall dynamics by means of magneto-optical Kerr effect (MOKE) microscope. In contrast to the magnetic single layer which shows single minimum conventionally, the magnetic double layers show double minima. The results are shown in Fig. 1. The micromagnetic simulation results reveal that each magnetic layer has different internal dipolar magnetic field and thus, the domain wall in each magnetic layer feels different magnetic field. Consequently, each layer has different Walker breakdown field for each domain wall, the domain wall velocity exhibits double minima with respect to in-plane field.
Simulation of Multiple Walker Breakdowns
Jaesung Yoon,Joon Moon,Kitae Kim,Seong-Hyub Lee,Dae-Yun Kim,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Recently, magnetic thin films have drawn great technological attention due to their prospects for use in next-generation memory and logic devices. Particular focuses are given on their domain wall dynamics, which means how to move them effectively. The domain wall dynamics and its characteristics are usually determined by magnetic properties, such as perpendicular magnetic anisotropy (PMA), Dzyaloshinskii-Moriya interaction (DMI), and the spin-orbit coupling effect (SOC), etc. As these properties mostly depend on the interfaces adjacent to the magnetic layers, the magnetic multilayered structures which have multiple interfaces are highlighted. For this study, we did micromagnetic simulation using so-called OOMMF. For the case of in-plane field - domain wall velocity plot, in contrast to the magnetic single layer which shows single minimum conventionally, double minima are observed in magnetic double layers. The results reveal that each magnetic layer has different internal dipolar magnetic field and thus, the domain wall in each magnetic layer feels different magnetic field. Consequently, each layer has different Walker breakdown field for each domain wall, the domain wall can go through multiple Walker breakdowns assisted by the in-plane field. 〈그림 본문참조〉
Junhyuck Yoon,Hyeoncheol Shin,Sumin Choi,Jaesung Yun,Kyoungok Choi 전북대학교 휴양및경관계획연구소 2015 휴양및경관연구 (J East Asian Landscape Studies) Vol.9 No.1
This study examined the preparations carried out to establish indoor garden areas in Seoul metropolitan subway stations and in 5 other metropolitan cities subway stations in order to present findings on how these preparations might be improved. The preparation ratio for indoor garden areas among Seoul metropolitan subway stations was 6.9%, 38 places, and the ratio overall for 5 metropolitan cities was 21.6%, 54 places. Among the 5 metropolitan cities, the ratio was 26.7% in Busan metropolitan city, 20.0% in Gwangju metropolitan city, 11.6% in Daegu metropolitan city, 18.2% in Daejeon metropolitan city, and 10.3% in Incheon metropolitan city. With regard to the results comparing the decoration ratio with natural flowers and artificial flowers among the prepared stations with indoor gardens, in the case of Seoul metropolitan area, places decorated with natural flowers numbered 23, and the ratio was 60.5%, but, in case of the 5 metropolitan cities, places decorated with natural flowers numbered just 6, and the ratio was just 11.1%. In the case of garden ornaments as material introduced in Seoul metropolitan area subway stations decorated with natural flowers and the 5 metropolitan cities subway stations, one to three kinds of ornament were introduced per each place, and the ornament items included rocks, garden lanterns, ponds, stone mortars, stone lamps, fountains, sculptures, mini water mills, and windmills. The introduced trees at subway stations in Korea that were decorated with natural flowers included 93 species of 70 genera of 45 families. The introduced trees included 87 species of 67 genera of 42 families in Seoul metropolitan area subway stations, and the introduced trees included 28 species of 16 genera of 11 families in the 5 metropolitan cities subway stations. Native trees included 21 species of 20 genera of 17 families. As for scenery formation elements according to the height of trees, in the case of Seoul metropolitan area, the introduced trees included 22 species of upper trees, 15 species of middle trees, and 46 species of lower trees. In the case of the 5 metropolitan cities, the introduced trees included 1 species of upper trees, 5 species of middle trees, and 18 species of lower trees. Therefore, volume and visual diversity in Seoul metropolitan area was provided by the height and bulk of trees, but the volume of scenery and diversity in the 5 metropolitan cities was insufficient. In the case of Seoul metropolitan area, using indoor garden spaces is necessary to connect with mini libraries, resting spaces, and snack bars, and various using types are necessary. In the case of the 5 metropolitan cities, only the visual image was provided, and therefore an activation plan for using spaces is necessary.
Inhibition of Wntless/GPR177 suppresses gastric tumorigenesis
( Jaesung Seo ),( Hyun Jung Kee ),( Hye Ji Choi ),( Jae Eun Lee ),( Soo-yeon Park ),( Seung-hyun Lee ),( Mi-hyeon Jeong ),( Garam Guk ),( Sooyeon Lee ),( Kyung-chul Choi ),( Yoon Young Choi ),( Hyunki 생화학분자생물학회(구 한국생화학분자생물학회) 2018 BMB Reports Vol.51 No.5
Wntless/GPR177 functions as WNT ligand carrier protein and activator of WNT/β-catenin signaling, however, its molecular role in gastric cancer (GC) has remained elusive. We investigated the role of GPR177 in gastric tumorigenesis and provided the therapeutic potential of a clinical development of anti-GPR177 monoclonal antibodies. GPR177 mRNA expression was assessed in GC transcriptome data sets (GSE15459, n = 184; GSE66229, n = 300); protein expression was assessed in independent patient tumor tissues (Yonsei TMA, n = 909). GPR177 expression were associated with unfavorable prognosis [log-rank test, GSE15459 (P = 0.00736), GSE66229 (P = 0.0142), and Yonsei TMA (P = 0.0334)] and identified as an independent risk predictor of clinical outcomes: GSE15459 [hazard ratio (HR) 1.731 (95% confidence interval; CI; 1.103- 2.715), P = 0.017], GSE66229 [HR 1.54 (95% CI, 1.10-2.151), P = 0.011], and Yonsei TMA [HR 1.254 (95% CI, 1.049- 1.500), P = 0.013]. Either antibody treatment or GPR177 knockdown suppressed proliferation of GC cells and sensitized cells to apoptosis. And also inhibition of GPR177 suppresses in vitro and in vivo tumorogenesis in GC cells and inhibits WNT/β-catenin signaling. Finally, targeting and inhibition of GPR177 with antibody suppressed tumorigenesis in PDX model. Together, these results suggest GPR177 as a novel candidate for prognostic marker as well as a promising target for treatment of GC patients. [BMB Reports 2018; 51(5): 255-260]
Report Timing Control Method for Monitoring WSN Applications
Jaesung Park,Changyong Yoon 한국지능시스템학회 2020 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.20 No.2
Wireless sensor network (WSN)-based monitoring application services frequently involve random installation of multiple sensor nodes in the monitoring area, allowing the nodes to transmit data periodically. However, this generates unnecessary and redundant data, causing an increase in data packet collision. This is because multiple sensors installed at similar locations will transmit the same data. Thus, this study proposes a method that enables each sensor node to autonomously determine data transmission time using only its local information. Through simulations, we verified that the proposed technique could control both unnecessary and redundant data transmission and data collision.
Distributed Medium Access Control Method through Inductive Reasoning
Jaesung Park,Changyong Yoon 한국지능시스템학회 2021 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.21 No.2
Wireless local area network (WLAN) uses a medium access control method based on the carrier sense multiple access with collision avoidance (CSMA/CA). In CSMA/CA, each station maintains a contention window by adjusting its size according to the perceived contention level. By making a station autonomously choose a waiting time randomly, using its current contention window size, CSMA/CA resolves the channel contention problem among a set of stations in a distributed manner. However, because the contention window size is limited, the packet collision probability increases sharply as the number of stations, with data to send, increases. To resolve this problem, we propose a novel medium access control method using a minority game. In the proposed method, each station learns the current contention level in a distributed manner and decides whether to send a packet using the acquired knowledge to decrease its packet collision probability. Through simulation studies, we show that compared with CSMA/CA and random selection methods, the proposed method decreases both the packet collision probability and the time interval between successful packet transmissions.