정성훈 교수

This paper presents a simple and large area wet chemical preparation route for molybdenum diselenide (MoSe2) atomic layers. MoSe2 was synthesized onto fluorine doped tin oxide substrates and could be directly used as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The role of deposition time on the growth of MoSe2 CE was elaborately discussed using Raman, X-ray diffraction and photoluminescence studies. Influence of wet chemical growth time on the surface modification of MoSe2 C

Silver nanoparticles were prepared by a polyol process of silver nitrate in the presence of Polyvinylpyrrolidone (PVP) with sodium carbonate as a reducing agent. The effect of the Na2CO3/AgNO3 molar ratio and the PVP concentrations on the reduction rate of the silver ions and the particle size of the silver particles were investigated. The mean particle size decreases with increasing PVP in the solution, but increases with increasing molar ratio between Na2CO3 and AgNO3. To understand the silver

The color depth of PET fabrics treated with colloidal silver and black disperse dye were investigated in this study. Five different add-on levels of the colloidal silver were applied to a polyester microfiber fabric and a polyester regular fiber fabric. Results showed that lightness(L*) and reflectance(%) of PET fabric treated with colloidal silver were lower than those of untreated PET fabrics. Also, we investigated the effect of added colloidal silver on washing, sublimation, rubbing, perspira

본 연구는 2000～2006년의 기간 동안 발생한 코스닥기업 인수합병결정의 성과를 측정하고 그 성과에 대한 횡단면분석을 통해 기업지배구조가 합병성과를 설명할 수 있는지 검토하였다. 본 연구를 통해 지분변수 등 기업지배구조 변수들이 합병성과의 횡단면 차이에 대해 상당한 설명력을 지니고 있음을 알 수 있었다. 본 연구의 시사점을 좀 더 구체적으로 서술하면 아래와 같다. 첫째, 지분변수 중에서 임원 지분이 대주주 지분변수, 지분 5% 이상 대량보유자의 지분과 기관투자자의 지분 등 외부 투자자의 지분보다 합병성과에 긍정적으로 영향을 미치는 결과로 나타났다. 둘째, 임원 지분 이외에 중요한 외부 투자자로 인식되는 외국인 지분의 경우, 그 자체로서는 기업합병의 성과에 큰 영향을 미치지 않은 것으로 나타났다. 이것은 선행연구와 달리(김희석ㆍ조경식 2006), 코스닥시장에서 외국인지분의 경우, 합병성과에 영향력이 없음을 알 수 있다. 또한, 소액투자자들도 내부지분과 같이 영향력이 큰 것으로 나타났

In this study, we prepared Pt nanoparticles through the reduction of H2PtCl6 solutions containing poly(vinylpyrrolidone) (PVP) as a capping agent and investigated the effects of several reaction parameters, such as the reducing agent-to-Pt molar ratio and the concentration and molecular weight (MW) of PVP, on the size, size distribution, and stability of the particles in the resulting Pt colloids. When PVP (MW 10,000) was added at a PVP-to-Pt molar ratio of 0.38 in the presence of NaOH, we obtai

Composite materials offer a number of distinct advantages in a wide range of low and high technology engineering applications. Considering the fact, in this study, a facile fabrication method of highly cut resistant composite fabrics using Kevlar and polyethylene is reported. 100% Kevlar, 100% Polyethylene and 50% Kevlar/50% Polyethylene composite fabrics are fabricated by weaving and knitting techniques. These fabrics were tested for cut index, abrasion, and puncture resistance for comparative

Bag filter media were prepared by a combination of needle punching and thermal bonding processes and treated with polytetraflouoroethylene(PTFE) aqueous solution. The air permeability of the prepared filter media increased with increasing needle strokes. As needling strokes increased, the pore size distribution became narrow and the tensile strength in the machine and cross direction approached an intermediate value suggesting isotropic nature. From the result of air filter performance test, the

When glyoxal was used as a crosslinking agent and aluminium ammonium sulfate as a catalyst for durable-press finishing, coreactants and additives to minimize the decrease of physical properties of durable-press finished cotton fabrics were studied. Also, optimum conditions such as coreactant/glyoxal mole ratio, the concentration of additives and the effects of one-bath and two-bath were investigated. Under the optimum concentration of DEG, the whiteness and strength retention of the fabrics trea

근래 한국경제의 최우선 과제인 스타트업 활성화는 창업 초기의 실패확률을 줄이고 기창업 성공률을 높이는 것이 무엇보다 중요하다. 이를 위해서는 스타트업들이 참고할 수 있는 방법과 가이드라인이 요구되어지며, 그것의 한 방편으로 ‘스타트업을 위한 디자인 개발 방법’에 대한 체계적인 연구가 필요하다. 이에 본 연구에서는 스타트업에 최적화된 프로토타이핑 방법론이 무엇이고, 이를 어떻게 활용할 수 있는지 가이드라인을 제시하였으며, 그 과정에서 고려해야 할 상황과 발생할 수 있는 문제점 등을 자세히 살펴보고자 하였다. 본 연구는 초기 창업기업의 제품개발에 적용 가능한 실행 전략뿐만 아니라 스타트업 과정의 이론과 실습을 가르치는 교육자, 그리고 스타트업에 멘토링을 제공하는 전문가들에게 효과적인 프레임웍이 될 수 있는 방법과 적용 프로세스의 기초연구로써 그 의의를 가진다.

Beyond extreme ultraviolet lithography (BEUVL) is considered to be a future patterning technology using light source with wavelength of 6.7 nm. However, it is difficult to optimize the material system for BEUV mask consisting of reflector and absorber design with an optimized multilayer mirror and absorber layer of the reflective mask. In this study, we propose a lanthanum nitride/boron (LaN-/B) Bragg reflector for 6.7nm through optical simulation. Instead of BEUV absorber, we propose 6% attenua