Polyamine류와 Imidazole 유도체가 배위된 Cu(II)착물의 저해효과에 관한 ZINDO/1 연구

김정성,최진태,김창만,송영대 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2

The investigation of the inhibitory activity on some Cu(II) complexes with polyamines and imidazole derivatives is performed by ZINDO/1 calculations. It was found that good correlation between enthalpy of formation of the Cu(ll) complexes and experimental inhibitory activity(IA) and the weaker bond strength of between central metal and ligand appears, the higher IA becomes. These results showed that the Cu(II) complexes have weak bond strength with the exception of the following very stable compounds: square planar [Cu(N-Proplm)₂(NCS)₂](N-Proplm=N-propylimidazole), distorted octahedral [Cu(bipy)₂(NCS)₂](bipy=2,2'-bipyridine), and five coordinate [Cu(Me6tren)(NCS)]^(+)(Me_(6)tren=tri(2-dimethylaminoethyl)amine). The degree of bond strength of Cu(II) complexes will be related to the IoglA value experimental inhibitory activity coefficient(IA).

나루터 : 주객 (主客)의 전도 (顚倒)

김정성 한국해사문제연구소 1991 (月刊)海洋韓國 Vol.209 No.-

무인 헬리콥터의 자동비행 운용모드에 관한 연구

김정성,이길호,조성범,장세아,최기영 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.4

본 논문에서는 무인 헬리콥터의 특성을 반영한 자동비행 운용모드를 제시하였다. 무인 헬리콥터 연구에서 사용되는 비행 모드의 분석을 통해 종/횡 축의 속도 제어, 고도 제어, 방위각 제어를 포함하는 자동비행 기본구성요소를 정의하였다. 정의된 요소들을 이용하여 제자리비행모드, 전진비행모드와 경로점 비행모드로 정의되는 기본적인 자동비행 운용모드를 구성하였다. 자동비행 기본구성요소와 기본적인 자동비행 운용모드를 이용하여 선회비행모드와 경로점 비행모드의 발전된 자동비행 운용모드를 제시하였다. In this paper, we propose auto flight control modes for unmanned helicopter. We defined basic auto flight control components such as lateral, longitudinal velocity control, altitude control and heading control using auto flight control mode analysis of unmanned helicopter. Based on above-mentioned components we defined basic auto flight control mode as hovering, forward flight, waypoint navigation flight. Finally, we suggested advanced auto flight control mode of loitering mode, waypoint flight using basic auto flight control component and basic auto flight control mode.

초임계법을 이용한 난분해성 유해물질인 폴리염화비폐닐 (PCB) 의 무해화 처리에 관한 총설 (1)

김정성,박윤열,김성윤 한국환경과학회 2000 한국환경과학회지 Vol.9 No.6

Attempts have been made to use Supercritical fluids for industrial purpose in a variety of fields and some of them, are already in practice. However, basic chemical properties of supercritical fluids have not been understood well. The present paper presents the results of physicochemical studies on Supercritical fluids as well as the application of supercritical fluids to industry. The detail is as follows PCB and organic compounds.

酸素(17O) 同位元素 核磁氣共鳴 Spectra를 이용한 Uranyl Ion 關한 硏究

김정성,정우식 대구대학교 기초과학연구소 1985 基礎科學硏究 Vol.2 No.-

Oxovanadium(Ⅳ)錯物에 對한 速度論的 硏究

김정성 대구대학교 산업기술연구소 1984 産業技術硏究 Vol.3 No.-

The Kinetics of various reactions for Oxovanadium VO^(2+)(Ⅳ)-complexes, exchange, substitution and formation reaction has been studied. Using spectrophotometric and stopped-flow measurement, both the entering ligand and VO^(2+)(Ⅳ) complexes were found to be the first order in every case. The results obtained from the study were: in case the rate constants was Kobs=1.82×10³s^(-1) (pH=6.7, at 25℃), the activation parameters were ΔH^(≠)=10.21Kcal/mole and ΔS^(≠)=-8.79eu and in case the rate constants were Kobs=4.31×10³ s^(-1)(pH=1.57, at 25℃) the activation parament ers were ΔH^(≠)=12.7Kcal/mole and ΔS^(≠)=-4.1 eu for formation. Ligand-substitution reaction on oxovanadium(Ⅳ) complexes are essentially associative. Furthermore, the charge of the entering ligands-Hmal and Ox^(2-) -is of particular importance in determining the ligand-exchange reactions with VO(Ox)^(2-)₂ and the rate of complex formation for VO^(2+) (aq) to form VO(Ox)^(2-)₂.

팔면체형 Fe(Ⅱ)와 Ni(Ⅱ)착물의 실측 리간드화열에 관한 이론적 연구

김정성,최진태,송영대,조태섭,Kim, Jung Sung,Choi, Jin Tae,Song, Young Dae,Cho, Tae Sub 대한화학회 1999 대한화학회지 Vol.43 No.2

The correlation was investigated between the observed heat of ligation and calculated quantum chemical quantities for octahedral $[M(H_2O)_{6-x}(NH_3)_x]^{2+} (M=Fe(II),\;Ni(II))$ complexes by EHMO(Extended Huckel Molecular Orbital) and ZINDO/1(Zerner's Intermediate Neglected of Differential Overlap)method. The net charge of $Fe^{2+}$ and $Ni^{2+}$ ion of octahedral $[M(H_2O)_{6-x}(NH_3)_x]^{2+}(M=Fe(II),\;Ni(II))$ complexes(x=O, 1, …, 6) decreased with substituting $NH_3$ for $H_2O$ molecules. It has found that a good correlation exists between the observed heat of ligation and the calculated quantum chemical quantities such as net charge of central atom, enthalpy of formation, and total dissociation energy. From this finding, we have obtained the following semiempirical linear equation ${\Delta}H_{obs}=-0.2858_{qFe}+0.8813(r=0.97),\;{\Delta}H_{obs}=-0.8981_{qNi}+1.7929(r=0.95),\;{\Delta}H_{obs}=-0.0031H_{f(Fe)}+0.5725(r=0.97),\;{\Delta}H_{obs}=-0.0095H_{f(Ni)}+0.9193(r=0.97),\;{\Delta}H_{obs}=0.0476E_{diss(Fe)}+0.6434(r=0.94),\;{\Delta}H_{obs}=0.1401E_{diss(Ni)}+1.1393(r=0.93)$. Fe(II) 및 Ni(II) 이온에 $NH_3$ 리간드를 배위시켜 분자역학(MM2)법으로 최소에너지를 갖는 구조를 구한 후 확장분자궤도함수(EHMO)법 및 ZINDO/1법으로 양자화학적 양을 얻어 실험적 사실과 비교 검토하였다. 즉, 팔면체인 $[M(H_2O)_{6-x}(NH_3)_x]^{2+}(M=Fe(II),\;Ni(II)(x=0,\;1,\;…,\;6)에서 $NH_3$ 분자가 $H_2O$ 분자와 단계적으로 치환될 때에 따른 실측리간드화열이 MO 이론으로 계산한 팔면체형인 Fe(II)및 Ni(II)착물의 양자화학적 양인 중심금속의 알짜전하, 형성엔탈피, 총결합에너지로부터 실측 리간드화열$({\Delta}H_{obs})$을 이론적으로 예측할 수 있는 ${\Delta}H_{obs}=-0.2858_{qFe}+0.8813(r=0.97),\;{\Delta}H_{obs}=-0.8981_{qNi}+1.7929(r=0.95),\;{\Delta}H_{obs}=-0.0031H_{f(Fe)}+0.5725(r=0.97),\;{\Delta}H_{obs}=-0.0095H_{f(Ni)}+0.9193(r=0.97),\;{\Delta}H_{obs}=0.0476E_{diss(Fe)}+0.6434(r=0.94),\;{\Delta}H_{obs}=0.1401E_{diss(Ni)}+1.1393(r=0.93)$인 이론식을 각각 얻었다.

Effect of Electron Beam Irradiation on Load-displacement Responses of UHMWPE

김정성,Daegon Woo,Mi Hee Lee,Yong Sik Kim,임도형,한인호,박종철 한국생체재료학회 2009 생체재료학회지 Vol.13 No.1

Ultra-High Molecular Weight Polyethylene (UHMWPE) has been used successfully for articulating surfaces of joint endoprostheses, i.e. cup linear on acetabular component of total hip arthroplasty, in orthopaedics for over three decades. Although numerous attempts have been performed to characterize and to improve the polymeric material, i.e. to reduce the molecular degradation due to in vivo oxidation, the effect of electron beam irradiation on loaddisplacement characteristics of UHMWPE has not been reported clearly. The aim of the current study is to quantify the effect of the electron beam irradiation with alteration of the amount of irradiation on the mechanical characteristics of the polymeric material. In this work, monotonic uniaxial and small punch tests were conducted to examine the relative capabilities of four samples irradiated with electron beam at 0, 50, 100, and 150 kGy, based on a prediction of mechanical behavior of the UHMWPE materials. Load-displacement behaviors of UHMWPE were not changed significantly by electron beam irradiation less than 150 kGy although the stiffness of irradiated UHMWPE decreased gradually. Conclusively, changes of stiffness and deflection by irradiation were not significant. However, load characteristics were significantly changed by irradiation.

Kinetics of Ligand Substitution Reactions in Vanadium(III) Complexes with Multidentate Ligand

김정성,HIROSHI TOMIYASU 大邱大學校附設 基礎科學硏究所 1993 基礎科學硏究 Vol.10 No.-

The kinetics of ligand substitution reactions in V(Gly)3 (Gly = Glycine) with various multidentate ligands, nitrilotriacetate (NTA) and ethylendiaminetetraacetate (EOM) have been atudied spectre photometrically. The rates of EDTA and NTA substitutions depend on the entering species. The value of the second order rate constants are k11= 3.0 x 10-2 M-1 s-1(1 M = 1 mol dm 3) for H2edta, k21 = 0.24 M-1 s'1 for Hnta and 1.9 x 10-2 M-1 s-1 for H2nta as an entering ligand, respectively at 250C. Large negative values of activation entropies are interpreted by associative mechanism.

글로벌 금융위기 전후 무위험 이자율 평형조건의 동태성 변화 분석

김정성,강규호,Kim, Jung Sung,Kang, Kyu Ho 한국개발연구원 2014 韓國 開發 硏究 Vol.36 No.2

무위험 이자율 평형은 환율과 금리 간의 관계를 체계적으로 설명한 조건식으로서 개방거시분석 등에 널리 활용되고 있다. 그럼에도 불구하고 동 조건 성립 여부에 대한 검증은 국가별 거시경제 여건 등의 상이성 등으로 인해 뚜렷한 합의를 이루지 못하고 있다. 특히 글로벌 금융위기 전후 주요국의 정책대응은 국제금융시장에 큰 변화를 가져왔으며, 한국을 포함한 신흥국 시장에도 간접적으로 영향을 미쳤다. 이러한 관점에서 본고는 글로벌 금융위기 전후 우리나라 무위험 이자율 평형조건의 동태성을 국면전환모형으로 모델링하고 베이지안 MCMC 방식에 기반하여 추정한 다음, 추정 결과를 바탕으로 정책적 시사점을 제시하였다. 추정 결과, 세 개의 구조변화를 가정한 모형이 우리나라 이자율 평형조건의 동태성을 가장 잘 성명하는 것으로 나타났으며, 최근에는 평형조건의 불균형 정도가 크게 완화되고 변동성도 안정적인 상태에 진입한 것으로 분석되었다. 본고는 이러한 추정 결과를 얻은 주된 이유가 글로벌 유동성 증가에 따른 외국인 채권 차익거래와 단기 원화 및 외화 자금시장의 연계성 강화에 주로 기인한 것으로 판단하였다. 추정방식 측면에서 본고는 모형 내에 구조 변화를 가정하지 않는 기존 연구를 한층 더 정교하게 발전시켰다는 점에서 기존 연구와 차별화될 뿐만 아니라 추정 결과를 해석하는 과정에서 단기 원화 및 외화 자금시장의 성격 변화에 주목하였다는 점에서 기존에 시도하지 않은 무척 새로운 접근방식이라고 할 수 있을 것이다. 본고의 정책적 시사점은 이자율 평형조건의 동태성 등을 고려하여 정책당국이 시장모니터링을 더욱 강화하고 새로운 정책수단을 발굴할 필요가 있다는 점 등이다. The covered interest rate parity condition (CIRP) has been widely used in open macroeconomic analysis, risk management, exchange rate forecasts, and so forth. Due to the recent global financial crises, there have been remarkable changes in the financial markets of the emerging markets. These changes possibly influenced the dynamics of the covered interest rate parity condition. In this paper, we investigate whether the CIRP dynamics has changed, and what is the nature of the regime changes. To do this, we propose and estimate multiple-state Markov regime switching models using a Bayesian MCMC method. Our estimation results indicate that the default risk or the deviation from the CIRP has been decreased after the crisis. It seems to be associated with the more active interaction between the short-term bond market and the short-term foreign exchange market than before. The tightened relation of these two financial markets is caused by the arbitrage transaction of foreign investors.