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Determination of the Crystalline x-Axis of Quartz by Second-Harmonic Phase Measurement
전윤남,Doeok Kim,민해식 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
Second-harmonic phase measurement was used to determine the x-axis (including the direction) of y-cut quartz crystal by measuring the phase of the secondharmonic signal. The reference secondharmonic signal for the determination of the phase was generated from 50-μm-thick reference quartz (z-cut quartz) in the beam path after the sample. Clear interference fringes were observed by changing the relative phase between the second-harmonic electric field from the sample and the reference by rotating the fused quartz plate in between. The second-harmonic signal with input field parallel to the x-axis became different from that with input field antiparallel to the x-axis in the presence of an interfering reference field, thus allowing us to etermine the direction of the crystalline axis of quartz.
전윤남(Yoonnam Jeon),김상준(Sangjun Kim),박지현(Jihyun Park),정나겸(Nagyeom Jeong) 한국표면공학회 2019 한국표면공학회지 Vol.52 No.5
Anodization is widely used to enhance the properties of aluminum, such as hardness, electric resistance, abrasion resistance, corrosion resistance etc. But these properties can be enhanced with additional process. According to the partial crystallization of oxide layer with post heat treatment, enhanced hardness can be expected with partial crystallization. In this study, post heat treatments were applied to the anodized aluminum alloys of Al6061 to achieve the partial crystallization, and crystallizations were evaluated with the reduced breakdown voltages. Interestingly, remarkable enhanced hardness (21~29%), abrasion resistance (26~62%), and reduced breakdown voltage (24~44%) were observed for the sulfuric acid anodized samples when we annealed the anodized samples with 1hour post heat treatment at 360℃. For the Al5052 alloys, a lot of cracks were observed when we applied the post heat treatment.
蘇鮮燮,全閏南,申弘烈 공주대학교 사범대학 과학교육연구소 1996 과학교육연구 Vol.27 No.1
안개는 수증기의 供給源인 바다, 호수, 강, 인공댐 및 태양 에너지의 입사량 변화로 發生하게 된다. 목포지방은 三面이 바다로 둘러 싸여 있으며, 주변의 造成된 영산강 댐과 2개의 人工 호수 때문에 안개 發生에 좋은 조건을 갖추고 있다. 본 硏究는 목포지방의 안개 發生 特性을 밝히기 위하여 안개 發生日數, 特續時間, 風向, 風速, 氣溫과 水溫의 偏差를 비교 分析하였다. 또한 안개의 發生 및 消散시각의 분포에 따라 4가지 Case로 분류하고 氣象要素의 變化에 따른 안개의 視程 변화를 分析해 본 결과 夏節期에는 따뜻하고 수증기를 많이 포함한 空氣가 찬 바다 위로 이동하면서 移流안개가 발생하고 봄·가을에는 氣溫의 日較差에 의해 輻射안개와 ??發안개가 複合的으로 나타난다. A fog is variously induced by the sea, the lake, the river, the artificial dam and the solar energy which originate the vapor. The Mokpo area is surrounded by the sea, the Youngsan river and the artificial lakes which naturally tend to cause a dense fog. This research shows the analogy and comparison to prove the traits of what made a fog in the Mokpo area; how many days a month the fog originates; how many hours it lasts, both the direction and the velocity of the wind, and the anomaly between atmos-pheric temperature and the sea-water temperature. The types of the fog occurrence and the dstribution of the fog-clearing time are classified into four cases. This research also tells that as a result, the change of the fogcl-earing speed brings those facts as follows: (i) when the air, warm and vaporous, is d-rifted away over the cold sea-water in the summertime; (ii) it makes the advection fog and in the season of spring and fall, it makes both the evaporation fog and the radiati-on fog at the same time, due to the great daily temperature difference. The fog in Mokpo area has high occurrence-frequency both when the velocity of the wind runs below 3 m/s and when the direction of the wind indicates NNW,NW,SSW,SSE, etc...
Second Harmonic Generation from Bi3.75La0.25Ti3O12 Thin Films Grown by Sol-gel Method
민해식,전윤남,Sungmin Park,Hyosang Kwon,Jaemoon Pak,Doyoung Park,Sanghoon Song,정현식,박광서,김현정,김도석 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
Ferroelectric Bi3.75La0.25Ti3O12 (BLT) thin films were grown on Pt(111)/Ti/SiO2/Si substrates by repeatedly using the sol-gel method at an 800 C annealing temperature. Varying the film thickness via the number of applied sol-gel processes hardly changed the bulk structure as verified by X-ray diffraction and Raman spectroscopy. The optical second-harmonic signal showed no appreciable change either while the phase of the generated second-harmonic signal increased gradually with the film’s thickness, suggesting that the second-harmonic signal originated from the buried, bottom BLT layer.