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김덕현,김수진,Kim, Duk-Hyun,Kim, Su-Jin 한국공업화학회 1999 공업화학 Vol.10 No.2
9-methyl-2,3,6,7-tetramethoxyfluorene이 $CH_3CN$과 $CH_2Cl_2$/TFA/TFAn-혼합용매계에서 갖는 전기화학적 특성을 CV측정을 통해 조사하였다. 이 화합물은 $CH_3CN$용매계에서 첫 번째 전자이동은 준가역 (quasi-reversible)반응, 두 번째 전자이동은 비가역 반응이었다. 그러나 TFA가 포함된 혼합용매 ($CH_2Cl_2$/TFA/TFAn)-계에서는 첫 번째, 두 번째 전자이동단계 모두 가역반응을 나타냈다. 진한 청색을 띄는 전해생성물은 혼합용매계에서 안전한 상태로 존재할 수 있어 향후 전기발색소자로서 사용이 가능하다. The electrochemical properties of 9-methyl-2,3,6,7-tetramethoxyfluorene have been investigated by cyclic voltammetry in acetonitrile, dichloromethane, trifluoroacetic acid (TFA) and trifluoroacetic acid anhydride (TFAn). The first charge transfer for the compound in $CH_3CN$ appeared to be a quasi-reversible one-electron step. The second oxidation step from cation to dication was irreversible. However, the oxdition of the compound in a mixture of solvents containing $CH_2Cl_2$, TFA and TFAn was reversible for both the first and second charge transfer reactions. Since the electrolytic products display a darkblue color and can be stabilized in the solvent mixture, they may be used as an electrochromic material.
특별직교 이방성 판이론에 의한 단순지지된 샌드위치 슬래브교의 해석
김덕현 ( Kim Duk-hyun ),한봉구 ( Han Bong-koo ),남정훈 ( Nam Jung-hoon ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
복철근으로 배근된 단순지지된 철근 콘크리트 슬래브에 프리스트레스를 도입할 경우 특별직교 이방성 판이론에 의한 해석 결과는 김덕현 박사등에 의해 발표되었는데, 이 방법은 일반 기술자 들에게는 너무 어려워서 실용 가치가 적다. 본 논문에서는 일반 기술자들이 사용할 수 있는 보 이론을 사용하여 프리스트레스를 지점 모멘트와 축하중으로 변환하여 해석하고 특별직교 이방성 판이론에 의한 결과와 비교 검토하여 정확성을 검증하고 실무에 적용할 수 있는 자료를 제시하고자 하였다. Results of Analysis by the Special othotropic plate theory in case of pre-stressing to double reinforced concrete slab are announced by D.H Kim and many engineer. This method is difficult to general engineers and it is of little value. This paper use a beam theory - easy to general engineers, and analyzing transferred pre-stress to a moment and a vertical load and presenting compared the result of using the Special othotropic plate theory with a former result and verified accuracy and presented a data apply to a practical affair.
양단 단순지지 다른 양단 자유단인 변단면을 가진 복합재료 판의 진동해석
김덕현 ( Duk-hyun Kim ),한봉구 ( Bong Koo Han ),임태호 ( Tae-ho Lim ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
The problem of deteriorated highway concrete slabs and other structural elements is very serious all over the world. Before making any decision on repair work, reliable nondestructive evaluation is necessary. One of the dependable methods is to evaluate the in―situ stiffness of the structural member by means of obtaining the natural frequency. By comparing the in―situ stiffness with the one obtained at the design stage, the degree of damage can be estimated rather accurately. A method of calculating the natural frequency corresponding to the first mode of vibration of beam and tower structures, with irregular cross-section and with arbitrary boundary condition was developed and reported by D. H. Kim in 1974. This method has been developed for two-dimensional problems including the laminated composite plates and was proved to be very effective for the plates with arbitrary boundary conditions and irregular sections. In this paper, the result of application of this simple method of vibration analysis developed by the senior auther, to the special orthotropic plates with variable cross-section, and with a pair of opposite edges simple supported and the other pair of opposite edges free is presented. This problem represents the simple-supported single span bridge system without effective longitudinal edge beams. The effect of concentrated point mass/masses is also studied.