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Liquid Crystal Display용 Spacer Particle로서 Monodisperse Polymer Particle의 活用
김기식 대진대학교 1996 大眞論叢 Vol.4 No.-
Aromatic liquid crystalline polymers consisted of cyclohexyl and pyridine unit, with bromobenzene, chlorobenzene or naphthalene unit were synthesized and characterized. Utilization of monodisperse polymer particles, which were prepared by "accelerated molecular diffusion" seeding polymerization, as spacer particles was investigated. Compressive behavior was measured with a micro-compressive instrument on each particle. The cell thickness of liquid crystal display(LCD) panel was simulated on the basis of particle size distribution, elastic modulus, and the number of spacer particles. As a result, ever when spacer particles in the liquid crystal display panel fluctuated, spacer particles having narrow particle size distribution keep the minute cell thickness constant and monodisperse spacer particles having a high compessive modulus keep the constancy of cell thickness. These simulation results were in good agreement with the experimental results on Liquid Crystal Display panel assembly.
김기식,최진수,김보성 동국대학교 의학연구소 2009 東國醫學 Vol.15 No.2
중이강에 발생하는 선천성 진주종은 매우 드문 질환이나, 최근 이에 대한 관심의 증가, 신생아 선별 검사, 진단 장비의 발달 등으로 인해 보고되는 빈도가 높아지고 있으며, 발견 시기도 빨라지는 경향을 보인다. 선천성 중이 진주종의 발생 기전은 아직 명확하게 밝혀져 있지 않으나, 표피양 형성으로 인한 가설이 가장 대표적이다. 이학적 검사상 정상적인 고막의 내측에 존재하는 백색 종물의 소견을 보이며, 주로 고막의 전상부 혹은 후상부에서 발견된다. 증상이 없는 경우가 많으며, 병변의 침범 부위 및 진행 정도에 따라 다양한 증상을 보이나, 전음성 난청이 가장 흔하다. 안면 신경관이나 세 반고리관을 침범한 경우 안면 마비 혹은 어지럼을 동반할 수 있다. 치료는 병변의 위치 및 침범 정도를 잘 평가하여 적절한 수술 방법을 선택하여 병변을 남기지 않고 완전히 제거하고, 합병증의 발생을 예방하고, 청력을 최대한 보존하는 것을 목적으로 한다. 선천성 중이 진주종의 발생 빈도, 발생 기전, 진단 및 분류, 치료 및 예후 등을 문헌고찰을 통해 알아보고자 하였다. Congenital cholesteatomas of the middle ear have been consisdered a rare disease. However, a review of the literature reveals a dramatic increase in the number of reported cases during the past 30 years, together with a trend toward detection at an early age. Their cause remains controversial; however, the epithelial rest theory is most commonly accepted. Congenital cholesteatoma is classically visualized as a white mass medial to an intact tympanic membrane, and the most common sites of presentation on physical examination are the anterior-superior and posterior superior quadrants of the tympanic membrane. Conductive hearing loss is probably the most common presenting symptom. Vertigo and facial palsy are rare complications and may indicate erosion into the semicircular canals or the fallopian canal. Treatment of congenital cholesteatoma is still surgical and it's main goals are complete eradication of disease, preservation and optimization of hearing results and a trouble free ear. This article summarizes the incidence, pathogenesis, general diagnostic criteria, their usual presenting symptoms and findings, staging system, surgical treatment, and recidivism rates.
김기식 대진대학교 1995 大眞論叢 Vol.3 No.-
Aromatic liquid crystalline polymers consisted of cyclohexyl and pyridine unit, with bromobenzene, chlorobenzene or naphthalene unit were synthesized and characterized. The structures of polymers are as follows ; All of the polymers showed thermotropic behaviour. A homopolymers(NA/O) consisted of naphthalene and pyridine unit, and a copolymer(NA/0.5) containing naphthalene. pyridine and cyclohexyl unit of which mole fraction is 0.5 were not found the typical liquid crystalline behaviour. But all of the polymers, with the exception of the two polymers above, formed enantiotripic nematic phase. Thermal transitions of the polymers were dependent on thermal history noticeably and the thermal transition temperatures of the copolymers were lower than those of homopolymers. Thermal stabilities of the polymers based on the initial decomposition temperature were in the order of chloro-polymer(polymer Ⅱ)〉 bromo-polymer(polymer I)〉 naphthalen-polymer(polymer Ⅲ)〉.