중국 靑島의 한국 산업 이전 유치효과 향상방안 연구 : 靑島 진출 한국 기업의 투자동기 분석을 중심으로

徐永輝,全冬梅 신라대학교 경제경영연구소 2007 경제경영연구 Vol.8 No.-

This study analyzed the main motive of Korean firm's FDI into Qingdao of China in order to improve the effects of attracting Korean firm's FDI to Qingdao. This study first researched the literatures and studies on FDI motive systematically. Then classified it into two groups(low product's costs and Chinese domestic market) and measured Korean firm's features of real motive using survey data of (Korean) firm-level in Qingdao. Finally discussed and showed suggestions for Improving effects of attracting Korean firm's FDI to Qingdao.

마그네슘 풍부 해양미네랄 용액이 hairless 마우스의 아토피성 피부염에 미치는 영향

김동희,이규재,최주봉,이영미,윤양숙,김정례,장병수,양용석 韓國電子顯微鏡學會 2008 Applied microscopy Vol.38 No.3

Atopic dermatitis (AD) is a chronically relapsing inflammatory skin disease that often has asthma and allergic rhinitis. Magnesium salts, the important component of minerals in Dead Sea water, are known to exhibit beneficial effects in inflammatory disease. Favorable effects of magnesium ions and sea water treated to the skin of patients with contact dermatitis have been reported. But histological and immunological investigations are insufficient. This study was performed to examine the inhibitory effect of magnesium-rich sea mineral water on the development of AD-like skin lesions in hairless mice. AD-like skin lesions are induced by the repeated application of 2,4-dinitrochlorobenzene (DNCB). Local application of magnesium-rich sea mineral water on hairless mice skin applied with DNCB inhibited the development of AD-like skin lesions as exemplified by a significant increase in skin hydration (p<0.01), and a decrease in epidermal water loss (p<0.01). Serum IgE level was also significantly decreased (p<0.01). These results suggest that magnesiumrich sea mineral water inhibits the development of DNCB-induced AD-like skin lesions in hairless mice. These observations indicate that magnesium-rich sea mineral water may be alternative and assistant substances for the management of AD. 아토피성 피부염은 주로 천식과 비염 등을 동반하는, 주위에서 흔히 볼 수 있는 만성 염증성 피부질환으로 유전학적, 환경적, 면역학적 요인이 복잡하게 연관되어 발병한다. 해수에 포함된 마그네슘염은 피부에 작용하여 피부장벽을 보호하는 것으로 알려지고 그에 대한 면역학적인 연구와 조직학적 연구는 아직 부족한 실정이다. 이번 연구에서는 피부염을 인위적으로 일으키는 hapten 형성물질인 DNCB를 hairless mice에 도포하여 아토피 피부염 동물 모델로 만든 후, 마그네슘이 다량 함유된 해양 미네랄수를 처리한 후 피부장벽에 미치는 영향을 관찰하였다. DNCB로 피부염을 유발한 hairless mice에 해양미네랄수를 국소적으로 도포하였을 때 유의한 피부수분함량이 증가와 경피수분손실의 감소를 확인하였다 (p<0.01). 피부측정에서 피부거칠기(skin roughness, p<0.05)와 스케일생성 (skin scaliness, p<0.01)은 실험군에서 유의한 개선효과를 나타내었으며 조직학적 검사에서도 피부손상지수의 유의한 감소 (p<0.01)와 비만세포와 (p<0.01) 호산구의 감소(p<0.05) 소견을 보였고 또한 혈청 IgE의 감소를 관찰할 수 있었다(p<0.01). 이상과 같이 마그네슘이 다량 함유된 해양 미네랄수 도포는 피부장벽의 손상을 줄이고 피부수분손실을 효과적으로 줄임으로 아토피성 피부염 증상 유발을 억제할수 있음을 확인하였다. 현재까지 아토피성 피부염의 관리를 위하여 세라마이드나 식물성 오일의 보습제가 주로 활용되고 있는 상황에서 부가적인 피부장벽의 보호를 위하여 탈염 해양 미네랄수의 활용이 가능할 것으로 판단되며 장기적으로 아토피 피부염치료의 대체, 혹은 보조적 물질로 활용될 수 있을 것으로 기대된다.

On the Origin of Improved Charge Transport in Double-Gate In–Ga–Zn–O Thin-Film Transistors: A Low-Frequency Noise Perspective

Yong Xu,Chuan Liu,Amegadez, Paul Seyram K.,Gi-Seong Ryu,Huaixin Wei,Balestra, Francis,Ghibaudo, Gerard,Yong-Young Noh IEEE 2015 IEEE electron device letters Vol.36 No.10

<P>Low-frequency noise (LFN) in double-gate (DG) In-Ga-Zn-O (IGZO) thin-film transistors (TFTs) is studied to investigate the origin of performance improvement. We found that thinning down the IGZO film enhances such improvements. With 7-nm IGZO, the mobility is raised by a factor of 3.77, and the subthreshold slope is reduced to 0.17 V/decade from single-gate to DG mode. Device simulations show that bulk transport inside IGZO film emerges as the two gates field effects get coupled. The LFN results reveal a transport transition from surface to bulk and disclose the superior bulk transport that experiences slight phonon scattering with a small Hooge parameter alpha(H) = 4.44 x 10(-3), whereas the surface transport undergoes serious charge trapping with surface trap densities about 2 x 10(11) eV(-1)cm(-2).</P>

녹차와 녹차폴리페놀의 담배에 의해 유발되는 폐암발생 억제효과

Yong Xu,Chi-Tang Ho,Chi Han,Fung-Lung Chung 한국식품과학회 1997 심포지엄 Vol.1997 No.1

Watermelon and Melon Breeding and Genomics in China

Yong Xu 한국원예학회 2008 한국원예학회 기타간행물 Vol.- No.-

Ultrasensitive artificial synapse based on conjugated polyelectrolyte

Xu, Wentao,Nguyen, Thanh Luan,Kim, Young-Tae,Wolf, Christoph,Pfattner, Raphael,Lopez, Jeffrey,Chae, Byeong-Gyu,Kim, Sung-Il,Lee, Moo Yeol,Shin, Eul-Yong,Noh, Yong-Young,Oh, Joon Hak,Hwang, Hyunsang,Pa Elsevier 2018 Nano energy Vol.48 No.-

<P><B>Abstract</B></P> <P>Emulating essential synaptic working principles using a single electronic device has been an important research field in recent years. However, achieving sensitivity and energy consumption comparable to biological synapses in these electronic devices is still a difficult challenge. Here, we report the fabrication of conjugated polyelectrolyte (CPE)-based artificial synapse, which emulates important synaptic functions such as paired-pulse facilitation (PPF), spike-timing dependent plasticity (STDP) and spiking rate dependent plasticity (SRDP). The device exhibits superior sensitivity to external stimuli andlow-energy consumption. Ultrahigh sensitivity and low-energy consumption are key requirements for building up brain-inspired artificial systems and efficient electronic-biological interface. The excellent synaptic performance originated from (i) a hybrid working mechanism that ensured the realization of both short-term and long-term plasticity in the same device, and (ii) the mobile-ion rich CPE thin film that mediate migration of abundant ions analogous to a synaptic cleft. Development of this type of artificial synapse is both scientifically and technologically important for construction of ultrasensitive highly-energy efficient and soft neuromorphic electronics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conjugated polyelectrolyte (CPE)-based artificial synapse was fabricated. </LI> <LI> Important working principles of a biological synapse are emulated. </LI> <LI> The artificial synapse potentially exhibited ultrahigh sensitivity and low energy consumption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>An artificial synapse is fabricated to emulate biological functions with high sensitivity and low-energy consumption</P> <P>[DISPLAY OMISSION]</P>

Facile Synthesis of Ag/AgCl Grafted AgBi(MoO4)2 with Enhanced Photocatalytic Performance Under Visible Light

Xu Yan,Ziyang Wu,Yong Zhao,Biao Liu,Yong Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08

Silver nanoparticles (NPs) and related semiconductors are a family of very important and widely applied photocatalysts. However, the preparation of high stability and activity of this photocatalyst is still a challenge. In this work, we report a stable Ag/AgCl/AgBi(MoO4)2 heterojunction photocatalyst fabricated via a simple in situ anion-exchange reaction followed by the photoreduction treatment. In the treatment of tetracycline (TC) wastewater under visible light, the AC-0.4 sample (prepared with 0.4 mmol KCl) exhibits the significantly improved activity (degradation ratio, DR of 71.3%) compared with the pristine AgBi(MoO4)2 (30% DR) and Ag/AgCl sample (synthesized by the photoreduction of AgCl) (37% DR) under identical experimental conditions. This activity promotion is from the fast interfacial electron transfer between the heterojunction phases of AgCl/AgBi(MoO4)2 and the SPR effect of Ag NPs. After five successive recycles, the AC-0.4 sample still maintains good stability and activity for TC degradation, which shows a great potential to be used in practical application. Through the ESR and controlled scavenged experiments, we found the · OH and · O- 2 are the major reactive intermediate species in the TC photodegradation reaction. Our work provides a new insight into the synthesis of stable and high efficient Ag-based heterojunction photocatalysts for the application of wastewater treatment.

녹차와 녹차 플리폐놀의 담배에 의해 유발되는 폐암발생 억제효과

Yong Xu,Chi Tang Ho,Chi Han,Fung Lung Chung 한국식품과학회 1997 국제녹차심포지엄 Vol.1997 No.1

Schottky Barrier in Organic Transistors

Xu, Yong,Sun, Huabin,Noh, Yong-Young Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electron devices Vol.64 No.5

<P>Organic FETs (OFETs) are essential devices in future flexible electronics. Yet, a crucial issue associated with electronic contact is still unsolved and our fundamental understanding remains very limited. Unlike many other previous reports talking about the contact resistance, in this paper, we specifically discuss its major root: the Schottky barrier, by comparison of the conventional metal-silicon contacts, and the unconventional metal-organic contacts, where the special features in OFETs are underlined. We not only examine the basics of the Schottky barrier but also the extrinsic effects as well as the characterization methods. The key factors in device fabrication are also reviewed in order to minimize the detrimental impacts of the Schottky barrier for obtaining optimum device performance.</P>

Regulating Charge Injection in Ambipolar Organic Field-Effect Transistors by Mixed Self-Assembled Monolayers

Xu, Yong,Baeg, Kang-Jun,Park, Won-Tae,Cho, Ara,Choi, Eun-Young,Noh, Yong-Young American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16

<P>We report on a technique using mixed self-assembled monolayers (SAMs) to finely regulate ambipolar charge injection in polymer organic field-effect transistors. Differing from the other works that employ single SAM specifically for efficient charge injection in <I>p</I>-type and <I>n</I>-type transistors, we blend two different SAMs of alkyl- and perfluoroalkyl thiols at different ratios and apply them to ambipolar OFETs and inverter. Thanks to the utilization of ambipolar semiconductor and one SAM mixture, the device and circuit fabrications are facile with only one step for semiconductor deposition and another for SAM treatment. This is much simpler with respect to the conventional scheme for the unipolar-device-based complementary circuitry that demands separate deposition and processing for individual <I>p</I>-channel and <I>n</I>-channel transistors. Our results show that the mixed-SAM treatments not only improve ambipolar charge injection manifesting as higher hole- and electron-mobility and smaller threshold voltage but also gradually tune the device characteristics to reach a desired condition for circuit application. Therefore, this simple but useful approach is promising for ambipolar electronics.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-16/am5037862/production/images/medium/am-2014-037862_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5037862'>ACS Electronic Supporting Info</A></P>