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김지대,서호성,이동주 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
This study is for the stable optical source in order to get the precision measurement, which contributes to help the laser frequency and the output to be settled. The laser optical frequency is changed by the length of resonance cavity. The length variation of the laser resonance amplitude is affected by the thermal expansion of that system. So, we try not only to adjust the temperature of the laser tube using the heater for fine length of resonance cavity, but also to maintain the fixed temperature of the resonance cavity for outputting the safe laser optical frequency. Therefore, we must take materials with the thermal expansion of the supporting system, which is closer to it of the laser resonance cavity. Using the materials, we can promote to stabilize the temperature of it. In advance, we also plan to get the settlement of the laser frequency and the output in the long term, optimizing and stabilizing the system.
몰리브덴이 첨가된 Stellite 6 합금의 마모와 부식특성
申種喆,金在洙,李德悅,梁在雄,尹珍國,盧大虎,李種權 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10
Hardfacing layers of Stellite 6 with different molybdenum content are deposited on AISI 1045-carbon steel using Plasma Transferred Arc welding(PTA) machine. The microstructures, wear and corrosion resistances of the hardfacing layer are investigated in order to clarify the effect of molybdenum in Stellite 6 alloys. The microstructural characterizations of the hardfacing layers are performed using X-ray diffraction, back scattered electron images, and scanning electron microscopy. With an increase of Mo contents, M_6C type carbide are formed instead of Cr-rich type carbides, and so this microstructural change enhanced the mechanical properties such as wear and corrosion resistance of a Mo-modified Stellite 6 alloy.
Lee, Dea Uk,Yun, Dong Yeol,No, Young Soo,Hwang, Jun Ho,Lee, Chang Hun,Kim, Tae Whan American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>SnO2 nanostuctures were formed on indium-tin-oxide (ITO)-coated glass substrates by using an electrochemical deposition (ECD) method. X-ray photoelectron spectroscopy (XPS) spectra showed the existence of elemental Sn and O in the samples, indicative of the formation of SnO2 materials. An XPS spectrum showing the O 1s peak at a binding energy of 531.5 eV indicated that the oxygen atoms were bonded to the SnO2. Field-emission scanning electron microscopy (FE-SEM) images showed that the samples formed by using the ECD method had SnO2 nanostructures with a size between 280 and 350 nm. FE-SEM images showed that the size of the SnO2 nanostructures formed at 65 degrees C for 30 min increased with decreasing applied voltage. X-ray diffraction (XRD) patterns showed that the SnO2 nanostrucures had tetragonal structures with cell parameters of a = 4.738 A and c = 3.187 A. XRD results showed that the peak intensity of the (110) plane increased with decreasing applied voltage, indicative of a preferencial orientation of the (110) plane.</P>
System Software for a Flexible DSP Core
Lee,Jong Yeol,Lee,Dea Hyun,Kim,Jong Sun,Yoon,Hyun Dhong,Kyung,Chong Min,Park,Kyu Ho,Lee,Yong Hoon,Hwang,Seung Ho 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
MetaCore is a flexible DSP core in that the architecture of MetaCore can be modified easily by changing the hardware parameters. To fully exploit the merits of a flexible core, the system software must be reconfigurable when the target architecture changes. In this paper, we present a re-configurable system software for a flexible DSP core and the architecture selection procedure called $quot;compile-simulate-refine$quot; cycle using the re-configurable system software. The $quot;compile-simulate-refine$quot; cycle can make it possible to select the best architecture for a given application by exploring the possible candidate architectures in short time.
Park, Chul Ho,Bae, Harim,Choi, Wook,Lee, Kangwon,Oh, Dea-gyun,Lee, Jonghwi,Lee, Jung-Hyun THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.59 No.-
<P><B>Abstract</B></P> <P>For extracting the salinity gradient energy, membrane is a key material with a high power density. For this purpose, thin film composite (TFC) membranes were synthesized by interfacial polymerization using various acyl chloride and amine monomers. TFC membranes were characterized by FT-IR, SEM, XPS, and AFM. Among the range of TFC, the best candidate was prepared by combining 3,5-diaminebenzonic acid (0.5wt% with distilled water) and 1,3,5-benzenetricarbonyl trichloride (0.2wt% with n-hexane). The TFC membrane (thickness=0.02mm) generated a power density of 7.2W/m<SUP>2</SUP> at salinity gradient between 0.005 and 0.5M KCl solutions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thin film composite (TFC) membranes were studied for salinity gradient power (SGP). </LI> <LI> Interfacial polymerization mechanisms was understood using partition coefficient values. </LI> <LI> Through screening the combinations among aqueous and organic monomers, DBA-TMC TFC membranes were found for the best performance for SGP. </LI> <LI> The DBA-TMC TFC membrane has a higher normalized power density (7.2W/m<SUP>2</SUP>) than the other membranes (e.g., Nafion). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
콘텐츠 기반 캡차를 이용한 인터넷 뱅킹 서비스의 보안성 향상 기법
이상호(Sang-ho Lee),김성호(Sung-ho Kim),강전일(Jeon-il Kang),변제성(Je-sung Byun),양대현(Dea-hun Nyang),이경희(Kyung-hee Lee) 한국정보보호학회 2013 정보보호학회논문지 Vol.23 No.4
인터넷 뱅킹은 시간에 얽매이지 않는 편리성 때문에 널리 사용되고 있다. 하지만 인터넷 뱅킹 서비스가 자동화 프로그램에 의해 공격이 가능해 진다면 수많은 계좌가 공격의 위험에 노출될 것이며, 그로 인한 피해는 천문학적인 금액이 될 것으로 예상된다. 이와 같은 공격에 대응하기 위하여 Arcot사와 MS사는 각각 VPS와 MS 워터마크를 고안하였고, 이는 계좌 이체 정보를 이용하여 문자열 기반 캡차를 생성하고 있다. 이 논문에서는 위 기술들이 국내 인터넷뱅킹 서비스에 적용되었을 시 발생할 수 있는 취약점을 살펴보고, 기존의 기술을 개선시킨 대응방법과 사용자와 서버사이에 알려진 계좌 이체 정보를 이용하는 콘텐츠 기반 캡차 생성을 통해 인터넷 뱅킹의 안전성을 강화하는 기법을 제안한다. Internet banking service has a advantage that is unrestricted by time. If automated programs are able to attack Internet banking services, a number of accounts can be attacked at the same time and as a result, damage will be considerably increased. To cope with such attacks, two methods, VPS and MS watermark, were introduced by Arcot and MS respectively. The methods use text-based CAPTCHAs in the process of transfer approval to distinguish automated programs from legal human users. In this paper, we point out the security threats of the methods when those are applied to Internet banking services. Especially, we consider the attack that are performed by extract specific string from text-based CAPTCHAs and it"s countermeasure. Also we suggest a method of enhancing security of internet banking services. Our method is based on contents-based CAPTCHAs that are consist of known transfer information between user and server.