http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
何山 경성대학교 한국한자연구소 2018 한자연구 Vol.0 No.20
The existence of the similar Chinese characters is a special phenomenon which is determined by the rule of Chinese character formation law and the characteristic of configuration for expressive meaning. Traditional understanding located the similar Chinese characters in static similar shape category only according to the standard Chinese characters, it virtually ignored the dynamic adjustment and change of the relationship of handwriting and font in the historical evolution of Chinese character system, it also covered the deep-seated contradictions and the problems of the font between seeking for the simplicity and the difference in the process of Chinese characters system development. Chinese characters as symbols of recording and writing are often static and dynamic use of the organic unity, the similar Chinese characters will be accompanied by the two characteristics of static and dynamic similar shape. The effect between the two levels of static and dynamic interaction made the similar Chinese characters phenomenon presenting similar shape law of absolute and relative, direct and indirect, and so on. The rules and characteristics reflect similar shaped characters not only for seeking common ground, reflecting the character system and the inheritance of structural elements, but also for focusing in difference, reflecting distinction between characters and the different ways of richness, flexibility and subtlety to Chinese characters configuration system. The existence of the similar Chinese characters is essentially the result of the comprehensive function of the internal contradiction of the Chinese character system.
하산,정일두 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Polymers with high mechanical strength have attracted much interest, because of numerous potential applications. Nonetheless, the synthesis of highly stretchable polymers is still a challenge. In this study, movable slide-ring polymer gel was synthesized by crosslinking with diisocyanate and end-capped beta cyclodextrin (CD) based polyrotaxane. The polymer was characterized by HNMR and FTIR spectroscopy. Disappearing of the NCO groups suggest the formation the polymer and successful end capping. The formation of polyurea polypropylene glycol (PPG) also confirmed by GPC. This low covered crosslinked polyrotaxane can be stretched without deformation because of the slide ring movement of crosslinked CD on PPG polyurea urethane backbone. The tensile strength of the polymer gel was increased significantly with compared to non-crosslinked polyrotaxane. These unique properties of the resulting gels potentially act as flexible materials and create new opportunities for biomedical applications.
염수 환경에서 탄소강의 피리디늄 이온 액체에 대한 부식 억제 평가 연구
하산르가즈 ( Hassane Lgaz ),이한승 ( Lee Han Seung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
This study investigates the anti-corrosion properties of two eco-friendly pyridinium ionic liquids; 4DMN and 4DMP, in a 3.5% NaCl solution. Utilizing weight loss tests, EIS, PDP, quantum chemical calculations, and molecular dynamics simulations, the study demonstrates concentration-dependent inhibition efficiencies of 94% and 92% for 4DMN and 4DMP, respectively. The compounds modulate both anodic and cathodic reactions without altering the corrosion mechanism. EIS data suggest that a protective layer forms, supported by FE-SEM and AFM surface analyses, which reveal improved morphology and reduced roughness. Computational validations corroborate these empirical findings, highlighting the feasibility of these ionic liquids for effective, sustainable corrosion mitigation.
Fe(110) 표면의 피리딘 옥심 결합 메커니즘 및 전자 구조 해명: 전산 연구
하산르가즈 ( Hassane Lgaz ),이한승 ( Lee Han-seung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
The development of corrosion inhibitors with outstanding performance is a never-ending and complex process engaged in by researchers, engineers and practitioners. Computational assessment of organic corrosion inhibitors performance is a crucial step towards the design of new task-pecific materials. Herein, electronic features, adsorption characteristics and bonding mechanisms of two pyridine oximes, namely 2-pyridylaldoxime (2POH) and 3-pyridylaldoxime (3POH) with the iron surface were investigated using molecular dynamics (MD), and self-consistent-charge density-unctional tight-binding (SCC-DFTB) simulations. SCC-DFTB simulations revealed that 3POH molecule can form covalent bonds with iron atoms in its neutral and protonated states, while 2POH molecule can only bond with iron through its protonated form, resulting in interaction energies of -2.534, -2.007, -1.897, and -0.007 eV for 3POH, 3POH+, 2POH+, and 2POH, respectively. Projected density of states (PDOSs) analysis of pyridines-Fe(110) interactions indicated that pyridine molecules chemically adsorbed on the iron surface.
3.5 중량% NaCl 매질에서 구리에 대한 새로운 티아졸리딘디온 유도체의 부식 억제 특성
하산르가즈 ( Lgaz¸ Hassane ),이한승 ( Lee¸ Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
The search for new corrosion inhibitors for different corrosive mediums is a never-ending task. In the present work, the corrosion inhibition behavior and adsorption mechanism of two novel synthetic thiazolidinedione derivatives noted MTZD and ATZD in 3.5 wt.% NaCl solution on copper were investigated. Electrochemical, scanning electron microscope (SEM), atomic force microscopy (AFM) techniques were used along with first-principles DFT calculations. At maximum inhibitor concentration i.e., 300 ppm corrosion inhibition efficiency reached maximum up to 90% and 96% for MTZD and ATZD, respectively, and thereby followed the order of ATZD > MTZD. The inhibition efficiency increased up to 24 h of immersion, and then decreased after 48h immersion. The potentiodynamic curves suggested that the inhibition action of tested compounds is a mixed type of inhibitor. The first-principles DFT calculations suggested that compounds under investigation formed covalent bonds with Cu(111) surface via reactive sites. SEM and AFM results confirmed the formation of protective barrier that prevent corrosion attack.
새로운 히드라존에 의한 염화물 오염 합성 콘크리트 공극 솔루션에서 철근의 부식 억제에 대한 통찰력
하산르가즈 ( Lgaz Hassane ),이한승 ( Lee Han-seung ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
A new hydrazone derivatives namely (E)-N'-(4-(dimethylamino)benzylidene)-2-(5-methoxy-2-methyl-1H-indol-3-yl)acetohydrazide (HIND) has been confirmed for mitigating the corrosion of the steel rebar exposed to chloride contaminated synthetic concrete pore solution (ClSCPS). The mitigation of corrosion properties has been characterized by weight loss and electrochemical methods (Electrochemical impedance, Potentiodynamic polarization studies) as well as surface observations. The presence of HIND in the ClSCPS decreased the corrosion of steel rebar by adsorption of HIND molecules on the surface of the steel rebar. The optimal HIND concentration was 0.5 mmol/L, corresponding to an inhibition efficiency of 88.4%. The use of HIND enables the corrosion process to have a higher energy barrier. X-ray photo electron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscopyenergy- dispersive spectroscopy (SEM-EDS), and X-ray diffraction (XRD) spectroscopy interpretations confirmed that HIND mitigates the corrosion attack on the surface steel rebar.