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김병현 대한건축학회 1967 建築 Vol.11 No.2
과학자는 믿을 수 없을 정도의 정교한 기기에 둘러 싸여 있을 수 있는가 하면 단신 창을 마주 보고 앉아서 가끔 흑판에 방정식이나 긁적 거릴수도 있다. 문제는 언제 이 과학자가 흑판을 버리고 기기조립에 몰두 하기 시작 할 것인가에 있다. 연구생활이란 그 본질에 있어서 그 활동의 성격과 내용의 변화에서 - 미래를 예측할 수가 없다. 따라서 연구시설 또한 미래를 예측 할 수 없을 것이다. 이 예측할 수 없는 요소는 여러가지 점에서 연구소 건축에 영향을 주고 있다. 이하에서 연구활동이라는 그 성격을 중심으로 하여 연구시설을 계획 설계하는데 일어날 수 있는 여러 문제를 편의상 다섯 절로 나누어 분석 고찰해 본다.
김병현 대한건축학회 1996 建築 Vol.40 No.10
요즘 우리 주위의 중요한 화제 중의 하나가 시장개방에 따른 우리 건축계의 경쟁력이다 급성장한 우리 경제와 국제적 위치는 사회의 모든 분야에서 개방을 가져오고 있고 이는 오래전부터 예측하고 있던 사실이다. 국내 건축시장의 완전한 개방도 바로 목전에 다가왔다 이에대한 당위성 또한 우려를 이야기 하기에 앞서 과연 이 개방이 국제관계에서 할 수 없이 짊어지게 된 우리의 짐이냐. 그렇지 않으면 우리가 선택한 역사적 과정이나를 생각해 볼 필요가 있다.
김병현,박성찬 한국광학회 2016 Current Optics and Photonics Vol.20 No.4
This study presents a new optical system for a combiner-type head-up display (HUD) with a cylindricallens as an asymmetrical aberration corrector, instead of a freeform mirror. In the initial design processbased on off-axial aberration analysis, we obtain an off-axis two-mirror system corrected for linearastigmatism and spherical aberration by adding a conic secondary mirror to an off-axis paraboloidal mirror. Thus, since the starting optical system for an HUD is corrected for dominant aberrations, it enables usto balance the residual asymmetrical aberrations with a simple optical surface such as a cylinder, not acomplex freeform surface. From this design process, an optical system for an HUD having goodperformance is finally obtained. The size of the virtual image is 10 inches at 2 meters away from acombiner, and the area of the eye box is 130×50 mm2.
김병현,권혁춘 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1
The physical properties of polymer are greatly influenced by the extent to which resin cures. The presence of unreacted monomer can have a plasticizing effect on the polymer, thereby altering the physical and mechanical properties of dentin bonding agent(DBA). If the DBA does not polymerize sufficiently, it will leave a weak bonding layer and lead to lower bond strength. The purpose of this study was to evaluate te shear bond strengths(SBS) and the degree of conversion(DC) of 4 commercialy avilable dentin bonding systems which are composed of 2 multi-bottle systems [Scotchbond Multi-Purpose(SMP), AeliteBond(AB)] and 2 one-bottle systems [SingleBond(SB), One-Step(OS)]. For shear bond strength measurement, labial surfaces of freshly extracted bovine incisors were ground with #600 grit SiC paper to expose dentin. Four different groups of samples were formed, with 10 samples being made for each of the 4 commercial DBA in each group according to the curing sequences of DBA and overlayer thickness of composites:Group Ⅰ (standard cure and 1㎜ thick composites):The DBA was light cured and the composites of 1㎜ thickness was applied;Group Ⅱ (standard cure and 2㎜ thick composites):The DBA was light cured and the composites of 2㎜ thickness was applied;Group Ⅲ(simultaneous cure and 1㎜ thick composites):The DBA was not light-cured and simultaneously cured with composites of 1㎜ thickness;Group Ⅳ(simultaneous cure and 2㎜ thick composites):The DBA was not light-cured and simultaneously cured with composites of 2㎜ thickness. The SBS was measured immediately after the composites was bonded to the bovine dentin using an Instron machine. The DC of the DBA as examined in a thin film under simulated conditions of the experimental groups according to the curing sequences and overlayer thickness of composites in the SBS test. using a Fourier transform Infrared(FTIR) spectrometer. The following results were obtained from SBS tests and DC measurements 1. In SBS tests, the multi-bottle DBA(SMP, AB) had a generally higher bond strength values than the one bottle DBA(SB, OS). In DC measurements, the one bottle DBA(SB, OS) had a significantly higher DC than the multi-bottle DBA(SMP, AB). 2. In all DBAs except OS, there was no significant difference between the bond strength of group Ⅰ(standad cure and 1㎜ thick composites) and that of group Ⅲ(simultaneous cure and 1㎜ thick composites). SMP, SB in Group Ⅰ had a significantly higher DC than those in group Ⅲ, but AB, OS in group Ⅰ had a significantly lower DC than those in group Ⅲ 3. All DBAs in Goup Ⅱ(standard cure and 2㎜ thick composites) had significantly higher bond strength and DC than those in Group Ⅳ(simultaneous cure and 2㎜ thick composites). 4. In all DBAs, there was no significantly different SBS and DC between Group Ⅰ and Group Ⅱ, but all DBAs in Group Ⅲ had significantly higher SBS and DC than those in Group Ⅳ.