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Gi‑Su Ham,Young‑Kyun Kim,Young Sang Na,Kee‑Ahn Lee 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
This study investigated the effect of Ti addition on microstructure and high-temperature oxidation property of AlCoCrFeNihigh-entropy alloy. Ti content was controlled at 0 at% and 1 at%. The two alloys were found to have BCC single phase, andthe average grain sizes of Ti0.0 and Ti1.0 were 47.3 μm and 49.7 μm, respectively, showing similarity. The EDS mappingof the inside of grains found that both alloys were characterized to be divided into Al-Ni element rich region and Cr–Feelement rich region. As a result of high-temperature oxidation test at 1100 °C, oxidation weight gains were measured atTi0.0: 0.75 mg/cm2 and Ti1.0: 0.17 mg/cm2, respectively. The results indicate that Ti addition largely improved high temperatureoxidation resistance of AlCoCrFeNi HEA. Ti1.0 alloy, in particular, showed remarkably more excellent 1100 °Chigh-temperature oxidation resistance than other previously reported major ones such as NiCrAl and FeCrAl. In the surfaceand cross-section observations after oxidation tests, both alloys were found to have Al2O3oxides mostly. While the Ti0.0material was observed to have Al2O3spallation macroscopically, the Ti1.0 alloy showed Al2O3spallation only in some localareas. In addition, a unique result was found in AlCoCrFeNiTix(x=0,1) alloy that BCC → FCC phase transformation was accelerated,and FCC phase layer was formed in the surficial area where Al element had been depleted due to high-temperatureoxidation. Moreover, as Ti was added, the thickness of FCC layer induced by high-temperature oxidation decreased. Basedon the results, it was also discussed on how to improve the high-temperature oxidation resistance of AlCoCrFeNiTixHEA.
Lee,Sang Gi,Lee,Hi Deok,Lee,Young Jong,Jeong,Ju Young,Kwon,Oh Kyong,Lee,Chang Hyo 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
We investigate the effects of various ILD structures on device performance. The ILD films' property of electron trap generation rate and mobile ion were measured by constant current FN stress method and BTS(Bias Temperature Stress). The electron trap generation rate analysis shows that the HLD/BPSG and PETEOS/BPSG structure have more negative trap charges inside the gate oxide than the PETEOS/USG structure. The BTS results for the metal gate structure shows that PETEOS/USG results more mobile ions in the oxide than the HLD/BPSG. Also, the PETEOS/USG structure shows better gate oxide lifetime but more device degradation.
Lee, Sujin,Shin, Ju Yeon,Lee, Sang-gi Wiley-VCH 2013 Chemistry, an Asian journal Vol.8 No.9
<P>NP and tuck: Two different catalysts, a Ru-carbene complex and palladium nanoparticles, were immobilized onto the same imidazolium-salt-functionalized ionic CNTs. These supported dual-function catalysts showed excellent catalytic activity in tandem metathesis/hydrogenation reactions in an ionic liquid and could be recovered and reused four times. RCM = ring-closing metathesis.</P>
FUNCTION POINT ANALYSIS TO MEASURE DEVELOPMENT COST OF SOFTWARE SYSTEMS
Sang-Gi Park,So-Young Lee,Man-Gon Park 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
Software Development Effort and Cost Estimation are carried out by Software Size Estimation. The recent trend of Software Cost Estimation method is focused on the user's value. Function Point (FP) is one of the most frequently cited measures which are based on the economic value of the focus of user. Function Point Analysis (FPA) measures software size decided by the factors of information process size and technical complexity. It is independent of language and tool to be used for project development. It is possible for Software Size to be estimated at the early stage of development life cycle. This paper estimates Software Size Estimation by using FPA. We estimates the development cost based on the criterion of software measurement. In this study, we compare the estimated development cost with actual development cost. It analyze the cause occurred by the difference between two development cost and propose new way to reduce their gap.
Lee, Seul-Gi,Park, Ki-Min,Habata, Yoichi,Lee, Shim Sung American Chemical Society 2013 Inorganic chemistry Vol.52 No.15
<P>A 20-membered N<SUB>2</SUB>O<SUB>2</SUB>S<SUB>2</SUB> macrocycle (<B>L</B><SUP><B>1</B></SUP>) and a 40-membered N<SUB>4</SUB>O<SUB>4</SUB>S<SUB>4</SUB> macrocycle (<B>L</B><SUP><B>2</B></SUP>) obtained from the mixed products via respective [1:1] and [2:2] cyclization are employed, and a comparative investigation of the coordination behavior of these macrocyclic ligands with nickel(II), cadmium(II), and silver(I) is reported. The X-ray structures of seven complexes (<B>1</B>–<B>7</B>) have been determined, and a range of structural types and coordination modes, including mono- to multinuclear and endo- to exocyclic coordination, is presented. The cation-dependent endocyclic 1:1 (metal-to-ligand) complex [Ag(<B>L</B><SUP><B>1</B></SUP>)]NO<SUB>3</SUB> (<B>1</B>) and a sandwich-like 1:2 [Cd(<B>L</B><SUP><B>1</B></SUP>)<SUB>2</SUB>](NO<SUB>3</SUB>)<SUB>2</SUB> (<B>2</B>) complex exhibiting different stoichiometries and metal positions in the complexes were obtained by the reactions of the smaller macrocycle <B>L</B><SUP><B>1</B></SUP> with AgNO<SUB>3</SUB> and Cd(NO<SUB>3</SUB>)<SUB>2</SUB>, respectively. Meanwhile, the reactions of <B>L</B><SUP><B>1</B></SUP> with Ni(ClO<SUB>4</SUB>)<SUB>2</SUB>·6H<SUB>2</SUB>O and Ni(NO<SUB>3</SUB>)<SUB>2</SUB>·6H<SUB>2</SUB>O afforded the anion-dependent perching-type mononuclear solvato-complex [Ni(<B>L</B><SUP><B>1</B></SUP>)(CH<SUB>3</SUB>CN)<SUB>3</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>·2CH<SUB>3</SUB>CN (<B>3</B>) and the sandwich-like complex [Ni(<B>L</B><SUP><B>1</B></SUP>)<SUB>2</SUB>(NO<SUB>3</SUB>)<SUB>2</SUB>] (<B>4</B>), respectively. In the complexations of the larger macrocycle <B>L</B><SUP><B>2</B></SUP> with AgNO<SUB>3</SUB>, two endocyclic dinuclear complexes [Ag<SUB>2</SUB>(<B>L</B><SUP><B>2</B></SUP>)(CH<SUB>3</SUB>CN)<SUB>2</SUB>](NO<SUB>3</SUB>)<SUB>2</SUB> (<B>5</B>) and [Ag<SUB>2</SUB>(<B>L</B><SUP><B>2</B></SUP>)](NO<SUB>3</SUB>)<SUB>2</SUB> (<B>6</B>) with different coordination environments were isolated as a kinetic (<B>5</B>) and thermodynamic controlled (<B>6</B>) products in neutral condition. The identical reaction in acidic condition afforded a stairtype one-dimensional (1-D) coordination polymer {[Ag<SUB>2</SUB>(H<SUB>4</SUB><B>L</B><SUP><B>2</B></SUP>)(μ<SUB>2</SUB>-NO<SUB>3</SUB>)(NO<SUB>3</SUB>)<SUB>2</SUB>](NO<SUB>3</SUB>)<SUB>3</SUB>·CH<SUB>3</SUB>CN·3H<SUB>2</SUB>O}<SUB><I>n</I></SUB> (<B>7</B>) in which the disilver(I) complex cation units are connected by nitrate ions. From these results, the effects of the cation, anion, and size ratio on the topologies of the resulting solid complexes are discussed. NMR titrations of <B>L</B><SUP><B>1</B></SUP> and <B>L</B><SUP><B>2</B></SUP> with silver(I) nitrate were also carried out to explore their complexation behaviors in solution and for comparison with the solid state structures.</P><P>In complexation of a 40-membered N<SUB>4</SUB>O<SUB>4</SUB>S<SUB>4</SUB> macrocycle <B>L</B><SUP><B>2</B></SUP> with AgNO<SUB>3</SUB>, two endocyclic dinuclear complexes [Ag<SUB>2</SUB>(<B>L</B><SUP><B>2</B></SUP>)(CH<SUB>3</SUB>CN)<SUB>2</SUB>](NO<SUB>3</SUB>)<SUB>2</SUB> and [Ag<SUB>2</SUB>(<B>L</B><SUP><B>2</B></SUP>)](NO<SUB>3</SUB>)<SUB>2</SUB> with different coordination environments were isolated as kinetic and thermodynamic controlled products, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2013/inocaj.2013.52.issue-15/ic400247q/production/images/medium/ic-2013-00247q_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic400247q'>ACS Electronic Supporting Info</A></P>