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Effect of Surface Oxidation Layer on Tensile Strength of Cu-Ni Alloy in Friction Stir Welding
Taejin Yoon,Sangwon Park,Sungwook Chung,Joongsuk Noh,Kwangho Kim,Chungyun Kang 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.3
Friction stir welding (FSW) of thick Cu-Ni plate was successfully completed. The fracture position after tensile testing was located at the weld nugget zone (WNZ), where surface oxidation occurred. The oxidation morphologies on the surface of the base metal were analyzed by SEM, EPMA and XRD, with the oxide layer being obtained by simple and useful way to analyze the oxide products, namely, collecting oxide powders after immersing of the oxidized specimen into HNO3 solution. The results highlighted that an oxide layer of 30 μm thickness consists of a mixture of two phases, Cu2O and NiO, on the surface of the base metal. After FSW, the thickness of the oxide layer on the surface was decreased to approximately 5 μm, and broken oxide particles, which is NiO, penetrated into the WNZ by the rotating tool. NiO was preferentially formed at the surface after FSW because it has a lower Gibbs free energy value at 950 °C, which is the peak temperature measured during FSW. Oxide layer of Cu-Ni plate was clearly only removed by mechanical method grinding with 1200-grit SiC paper. The removal of oxide layer results in improved mechanical strength.
A Multifactorial Analysis of Can and May in Korean EFL Learners Writings
윤태진(TaeJin Yoon),이용훈(Yonghun Lee) 한국영어학학회 2016 영어학연구 Vol.22 No.1
It is well known that can and may have similar meanings and that the choice of the modal auxiliary in the English sentences is not arbitrary in native speakers' writings. This paper compares the distributions of these two modal auxiliaries in the EFL learners' writings with those of native speakers and examines which factor made the Korean EFL learners' writings non-native. For this purpose, this study took the Competition Model (CM; Bates and MacWhitney, 1982, 1989) as a theoretical framework. We used two corpora (the Korean component of TOEFL11 corpus and the ICE-USA) and extracted all the sentences with can and may. Then, twenty factors were encoded in the extracted sentences, which were subsequently analyzed with R. The encoded data were statistically analyzed with (binary) logistic regression and Behavioral Profile. Through the analysis, the following facts were observed: (i) the uses and distributions of can and may in the Korean EFL learners' writings are similar to those of (American) native speakers' counterpart, (ii) three factors (SubjMorph, SubjPers, and Mood) make the Korean EFL learners' English non-native, and (iii) the L1 effects were also observed in spite of similarities in the use of the modal auxiliaries between Korean learners of English and native speakers of American English.
Selective homocysteine turn-on fluorescent probes and their bioimaging applications
Lee, Hye Yeon,Choi, Yoon Pyo,Kim, Sunkyung,Yoon, Taejin,Guo, Zhiqian,Lee, Songyi,Swamy, K. M. K.,Kim, Gyoungmi,Lee, Jin Yong,Shin, Injae,Yoon, Juyoung unknown 2014 Chemical Communications Vol. No.
<P>The design and development of new pyrene-based fluorescent probes, <B>P-Hcy-1</B> and <B>P-Hcy-2</B>, which display selective fluorescence enhancements in response to homocysteine (Hcy), are described. The distinctly different fluorescence responses of <B>P-Hcy-1</B> and <B>P-Hcy-2</B> to Hcy <I>vs.</I> Cys are explained by theoretical calculations. Finally, the results of cell experiments show that these probes can be used to selectively detect Hcy in mammalian cells.</P> <P>Graphic Abstract</P><P>The design and development of new pyrene-based fluorescent probes, <B>P-Hcy-1</B> and <B>P-Hcy-2</B>, which display selective fluorescence enhancements in response to homocysteine (Hcy), are described. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc00243a'> </P>
Scalable Traffic Sampling Using Centrality Measure on Software-Defined Networks
Yoon, Seunghyun,Ha, Taejin,Kim, Sunghwan,Lim, Hyuk Institute of Electrical and Electronics Engineers 2017 IEEE communications magazine Vol.55 No.7
<P>With regard to cyber security, pervasive traffic visibility is one of the most essential functionalities for complex network systems. A traditional network system has limited access to core and edge switches on the network; on the other hand, SDN technology can provide flexible and programmable network management operations. In this article, we consider the practical problem concerning how to achieve scalable traffic measurement using SDN functionalities. Less intrusive traffic monitoring can be achieved by using a packet sampling technique that probabilistically captures data packets at switches, and the sampled traffic is steered toward a traffic analyzer such as an IDS on SDN. We propose the use of a centrality measure in graph theory for deciding the traffic sampling points among the switches. In addition, we discuss how to decide the traffic sampling rates at the selected switches. The results of the simulation and SDN testbed experiments indicate that the proposed sampling point and rate decision methods enhance the intrusion detection performance of an IDS in terms of malicious traffic flows in large-scale networks.</P>
Yoon, Taeho,Lee, Taejin,Soon, Jiyong,Jeong, Hyejeong,Jurng, Sunhyung,Ryu, Ji Heon,Oh, Seung M. The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.5
<P>High voltage positive electrodes for lithium ion batteries have suffered from continuous oxidation of the electrolyte during cycling, which largely offsets the benefits of high energy and power densities. In this work, the electrolyte oxidation and concomitant film deposition/dissolution behaviors were investigated on Pt electrode by using linear sweep voltammetry (LSV), electrochemical quartz crystal microbalance (EQCM), and X-ray photoelectron spectroscopy (XPS). Two characteristics were identified. First, film deposition is relatively unfavorable at higher potentials (>4.7 V vs. Li/Li+) because the oxidation products are mostly gaseous or soluble species. Second, the concentration of inorganic species decreases in the surface film as the potential increases, which is likely dissolved by HF or polar species. The dominance of gaseous or soluble products and the partial dissolution of the surface film, are two characteristics which hamper passivation of the electrode surface, leading to severe electrolyte oxidation at the high potentials. (C) 2018 The Electrochemical Society.</P>
A CMOS Hysteretic DC-DC Buck Converter with a Constant Switching Frequency
Taejin Jeong,Kwang S. Yoon 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.4
This paper describes a CMOS hysteretic DC-DC buck converter with a constant switching frequency for mobile applications. The inherent problems of a large output ripple voltage that the conventional hysteretic DC-DC buck converters has faced have been resolved by using the proposed DCDC buck converter which employed a ramp generator circuit to be able to increase a switching frequency. The proposed architecture enables the settling response time of charge pump circuit within the converter to become less than 6us suitable for mobile applications. The proposed DC-DC buck converter was implemented by using 0.35 um BCDMOS process and die size was 1.37 mm x 1.37 mm. The measurement results showed that the proposed circuit received the input of 3.7 V and generated output of 1.2 V with the output ripple voltages less than 20 mV under load currents of 100~400 mA at the fixed switching frequency of 2 MHz. The maximum efficiency of the proposed hysteretic buck converter was measured to be around 93%.
윤수현,김태진,이성열,이종석,황규왕 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.12
Dopamine is a catecholamine used in the treatrnent of circulatory shock of various etiologies. The usual dose range used is from 1 to 25 ug/㎏/min. When used at higher doses, the prominent effect of dopamine on the vasculature is vasoconstriction induced by stimulation of α-adrenergic receptors. We report a case of dopamine gangrene. The gangrene developed on the injection site in the right dorsum of foot in a 43-year-old man during infusion of dopamine for treatment of septic shock. The gangrenous lesion healded after change of injection site to subclavian vein. The dosage of dopamine was not higher, we think that the gangrene developed due to the local vasoconstriction caused by dopamine leakage from the vessels. (Korean J Dermatol 2003;41(12):1700~1702)