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Jehwan Hwang,Jiyeon Jeon,Sujin Yoon,Byung Soo Kang,Deok-Kee Kim,Ha Sul Kim,Sang-Woo Kang,Jun Oh Kim,Woo-Yong Jang,Urbas, Augustine,Zahyun Ku,Sang Jun Lee IET 2015 Electronics letters Vol.51 No.15
<P>In previous work, the present authors discovered the resonant splitting phenomenon of a plasmonic perforated gold film (PGF), as the incident light comes in the polar angle. However, in reality, the light through the imaging lens could be incident on the PGF not only in the polar angle but also in the azimuth angle. The transmission of a PGF against the incident light is analysed in both polar and azimuth angles in spherical coordinates. To mimic the incidence through the lens, a PGF sample is rotated by simultaneously varying both types of angles as normal incidence arrives. For the measurement, the sample has been fabricated with a PGF on a semi-insulating gallium arsenide (GaAs) substrate. The measured transmission spectra show both resonant splitting and merging under TM and TE polarisations as the azimuth angle is increased. Results drawn from this work will pave the way to fully understanding the interaction between the imaging lens and the plasmonic structure (PGF).</P>
Electric field-assisted patterning of few-layer MoTe2 by scanning probe lithography
Gu Min Seok,Ku JiYeon,Jang Won-Jun,Lee Chan Young,Kim Seong Heon,Kim Hyo Won 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.3
Transition metal dichalcogenides (TMDs) have been widely studied as attractive two-dimensional (2D) materials. In particular, specifc TMD materials have attracted increasing attention because of their intriguing features as 2D topological insulators (TIs), which have a metallic edge state and bulk band gap. To realize next-generation devices that employ the metallic edge states of 2D TI materials, precise patterning of the edges is essential. In this study, we demonstrate a simple nanopatterning technique for 1 T’-MoTe2, which is known to be a 2D TI material, using atomic force microscopy (AFM)-based scanning probe lithography (SPL). Our AFM-based SPL method entails delicately scratching a few-layer 1 T’-MoTe2 sample while applying an electric feld using a conductive AFM tip. The proposed method enables nanoscale lines, holes, and letters to be reliably patterned on the 1 T’-MoTe2 sample. This study results in the development of a clean method that is compatible with existing mass-production facilities to fabricate various TMD materials for realizing next-generation electronic devices and for studying the underlying physics of these materials.
이동 호스트를 위한 신뢰성 있는 멀티캐스트 프로토콜 구현
원유재(Yoojae Won),손지연(Jiyeon Son),신현산(Hyun-san Shin),황승구(Seung-Ku Hwang),유관종(Kwan-Jong Yoo) 한국정보과학회 1998 정보과학회 컴퓨팅의 실제 논문지 Vol.4 No.6
This paper presents the protocol architecture for reliable multicast in mobile environments. We also evaluated the throughput analytically. In the proposed proxy-based reliable multicast, the proxy set up reliable multicast backbone network so that hosts can use the reliable multicast services by connecting the nearest proxies through the reliable point-La-point protocol. Because the proxy-based model makes the proxy instead of the host be a member of the host group, the host can participate in the reliable group communication independently for the host mobility and the multicast capability. Our analytical results show that the proposed proxy-based model has better throughput compared to the known mobility-supporting reliable multicast protocol. 본 논문은 이동 컴퓨팅 환경에서 신뢰성 있는 멀티캐스트 통신을 위한 프로토콜 구조를 정의하여 구현하고 패킷 처리량을 기준으로 성능을 분석하였다. 본 논문에서 제안하는 대리자 모델에 의한 신뢰성 있는 멀티캐스트는 대리자들이 신뢰성 있는 멀티캐스트 백본 네트워크를 구성하여 신뢰성 있는 멀티캐스트 통신을 하고, 사용자는 자신에게 인접한 대리자와 일대일 통신을 통하여 대리자가 제공하는 신뢰성 있는 멀티캐스트 서비스를 이용한다. 대리자 모델은 이동 컴퓨팅 환경에서 유선망에 위치하는 대리자가 멀티캐스트 데이타그램의 송신자가 되도록 함으로써 이동 호스트에서도 이동성에 무관하게 멀티캐스트 데이타그램을 송수신할 수 있도록 하며, 멀티캐스트 기능을 제공하지 않는 네트워크의 호스트도 신뢰성 있는 멀티캐스트 서비스를 이용할 수 있도록 한다. 성능 분석 결과에 따르면, 기존의 이동성을 지원하는 신뢰성 있는 멀티캐스트 프로토콜 보다 패킷 처리량 관점에서 좋은 결과를 보였다.
Role of microRNAs on the regulating of receptivity in NHP model
( Yoon Young Kim ),( Jiyeon Han ),( Sungwoo Kim ),( Hoon Kim ),( Seung-yup Ku ),( Chang Suk Suh ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: Decidualization of the endometrium is a prerequisite for the successful embryonic implantation process. Its regulating mechanism is important to develop the strategy for endometrial receptivity-related infertility, e.g. recurrent implantation failure. The importance of microRNAs (miRs) in reproductive medicine has been known and their regulating role in fertility gains attention. In this study, we analyzed the expression of miRs and endometrial receptivity-related genes on decidualized EMs of mice and Rhesus monkey endometrium. Methods: The endometrium of mouse and Rhesus monkey was isolated from the uteri using mechanical and enzymatic dissociation. Decidualization of the retrieved endometrium was induced using the following different conditions. The degree of decidualization was evaluated using immunocytochemistry and the expression of mRNAs and miRs was analyzed using qRT-PCR. Results: The decidualization yields of mouse endometrium and rhesus endometrium were highest when treated with P4 and P4+cAMP, respectively. The expression of Vimentin, Desmin, FOXO1, PRL, and IGFBP-1 varied according to the inducing conditions. The expression of miR-21a, -181, -183, -200, and -542-3-p were enhanced in non-decidualized and decidualized endometrium. Conclusion: In conclusion, microRNAs involved in the decidualization process of mice and Rhesus monkeys were demonstrated. Analysis of expression profile demonstrated the roles of miRs, which suggests their potential use as non-invasive markers of uterus-related infertility (2020R1F1A1076286). * Part of this study was presented at the 2022 Cold Spring Harbor meeting.
Kim, Bongjoong,Jeon, Jiyeon,Zhang, Yue,Wie, Dae Seung,Hwang, Jehwan,Lee, Sang Jun,Walker, Dennis E.,Abeysinghe, Don C.,Urbas, Augustine,Xu, Baoxing,Ku, Zahyun,Lee, Chi Hwan American Chemical Society 2019 Nano letters Vol.19 No.8
<P>Guided manipulation of light through periodic nanoarrays of three-dimensional (3D) metal-dielectric patterns provides remarkable opportunities to harness light in a way that cannot be obtained with conventional optics yet its practical implementation remains hindered by a lack of effective methodology. Here we report a novel 3D nanoassembly method that enables deterministic integration of quasi-3D plasmonic nanoarrays with a foreign substrate composed of arbitrary materials and structures. This method is versatile to arrange a variety of types of metal-dielectric composite nanoarrays in lateral and vertical configurations, providing a route to generate heterogeneous material compositions, complex device layouts, and tailored functionalities. Experimental, computational, and theoretical studies reveal the essential design features of this approach and, taken together with implementation of automated equipment, provide a technical guidance for large-scale manufacturability. Pilot assembly of specifically engineered quasi-3D plasmonic nanoarrays with a model hybrid pixel detector for deterministic enhancement of the detection performances demonstrates the utility of this method.</P> [FIG OMISSION]</BR>
( Sung Jay Choe ),( Jiyeon Yoo ),( Seung Phil Hong ),( Sung Ku Ahn ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.2
Background: The various beneficial effects of moisturizer have been well established. However, it remains still unknown whether daily-used moisturizer can affect the photoaging process over a long period or not. Objectives: To investigate the effect of long-term use of moisturizer on the skin changes induced by long-term repeated exposure to suberythemal UV radiation. Methods: Hairless mice were divided into 4 groups according to the application time of moisturizer and UV exposure status: untreated control, UV exposure only (UV only), application of moisturizer 2 hour before UV radiation (Before), and application 1 hour after UV radiation (After) group. TEWL and SC hydration weremeasured every 6 weeks. After 18 weeks, Epidermal thickness (ET) and dermal thickness (DT), density of dermal fibrous components (DD) was measured from skin biopsy samples. Also, mRNA expression of MMP-13 and procollagen was quantified by real time RT-PCR. Results: After 18 weeks, all UV exposed groups showed increased ET and TEWL. The Before group had a lower margin of increase in ET and TEWL. DT and DD in the Before group was similar to the control group, whereas that of the UV only group was most reduced. Also, UV induced reduction of type 1 procollagen and rise of MMP-13 expression were alleviated in the Before group. Conclusion: Long-term application of moisturizer before UV exposure may have another beneficial role in the prevention against photo-aging, aside from its protective effect on the barrier function.
( Sung Jay Choe ),( Jiyeon Yoo ),( Seung Phil Hong ),( Se Kyoo Jeong ),( Sung Ku Ahn ) 한국피부장벽학회 2015 한국피부장벽학회지 Vol.17 No.2
The various beneficial effects of moisturizer have been well established. However, it remains still unknown whether daily-used moisturizer can affect the photoaging process over a long period or not. To investigate the effect of long-term use of moisturizer on the skin changes induced by long-term repeated exposure to suberythemal UV radiation, particularly focusing on the skin barrier properties and dermal components. Hairless mice were divided into 4 groups according to the application time of moisturizer and UV exposure status: untreated control, UV exposure only (UV only), application of moisturizer 2 hour before UV irradiation (Before), and application 1 hour after UV radiation (After) group. Each group was irradiated with 30mJ of UVB and 3J of UVA three times weekly for 18 weeks. Transepidermal water loss (TEWL) and stratum corneum(SC) hydration were measured every 6 weeks for evaluation of barrier properties. After 18 weeks of UV irradiation, Epidermal and dermal thickness, density of dermal fibrous components (collagen and elastic fiber) was measured from skin biopsy samples. Also, mRNA expression of matrix metalloprotease-13 and procollagen was quantified by real time reverse transcriptase-polymerase chain reaction. After 18 weeks of experimental period, all UV exposed groups showed increased epidermal thickness and TEWL. The Before group had a lower margin of increase in epidermal thickness and TEWL compared to the UV only and the After group. Dermis thickness and density of the dermal fibrous components in the Before group was similar to the control group, whereas that of the UV only group was most reduced. Also, UV induced reduction of type 1 procollagen and rise of MMP13 expression were alleviated in the Before group. Long-term application of moisturizer before UV exposure may have another beneficial role in the prevention against photo-aging, aside from its protective effect on the skin barrier function.