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심규한,김복기,김봉주,송경숙,조진형 한국물리학회 2007 새물리 Vol.54 No.2
We present an electrostatic force microscopy (EFM) and Kelvin force microscopy (KFM) study on PZT thin films. The EFM and KFM has been used as a nano-scale characterization tool for ferroelectric thin films. The contact mode is used for the writing process and the non-contact mode for the reading process. The interaction between the tip and the surface of the sample should be carefully analyzed to get useful information from the experimental results. Moreover, surface charging and the depolarization field are very important for understanding the imaging process. We have done the KFM and the EFM experiments on both sol-gel processed thin films of PZT and on the off-axis sputtered PZT thin films. The imaging processes of the KFM and the EFM are analyzed and carefully compared for both types of thin films. 우리는 본 논문에서 강유전체 물질인 PZT 박막에 대한 KFM 과 EFM 의 비교 연구 결과를 논의 하고자 한다. KFM 과 EFM 은 변형 SPM 기법으로 나노미터 영역에서 강유전체 박막의 분극반전 연구 수행에 이용되고 있다. 분극을 쓰는 과정은 AFM 상의 contact 모드에서 수행되었으며, 쓰여진 분극 정보를 읽는 과정은 non-contact 모드에서 수행되었다. 분극 쓰기와 읽기 과정에서는 상부 전극이 없는 상태에서 수행되기 때문에, 이 과정에서 일어나는 팁과 박막 표면 사이의 상호 작용은 주의 깊게 다루어 져야만 한다. 대표적인 예로 표면 전하 충전 (charging effect)과 편극소거장 (depolarization field)이 미치는 영향을 고려하여야 실험적인 사실을 올바르게 해석할 수 있다. 본 실험에서는 위와 같은 사실을 알아보기 위해 KFM 과 EFM 을 동시에 측정하였으며, 그 결과로부터 두 실험 결과의 차이점 및 공통점에 관해 논의할 것이다. 한편 박막의 방향성, 크기 등에 대해 알아보기 위해 두 가지 다른 방법으로 제작된 시료 (Sol-gel 방법 및 off-axis 증착 방법)에 관해 비교 연구도 수행하였다.
성상신경절 차단술과 상완신경총 차단술의 상지 피부온에 미치는 영향
심규호(Kyu Ho Sim),태일산(Il San tae),류지환(Ji Ha 대한통증학회 1996 The Korean Journal of Pain Vol.9 No.2
N/A Background: In our hospital, stellate ganglion block(SGB) has been performed for the prevention and treatment of vasospasm after microscopic reimplantation of finger(s). If brachial plexus blcok(BPB) has the same effect of sympathetic block on the upper extrem- ity as SGB, it may be preferable to the SGB because it povides postoperative analgesia and is administered continuously. So we measured and compared the change of skin temperature on the forearm as the parameter of sympathetic blockade after SGB and BPB. Methods: The forty-two patients, belonged to ASA class 1-2, were received BPB for hand surgery. The skin temperature was measured before and after BPB on the forearm with patient monitor(LN 6199, YSI 400 Series Temperature Probe, Hellige, Germany). After 24 hours, ipsilateral SGB was performed and skin temperature was recorded before and after SGB. Results: The increase of skin temperature after procedures was 1.1±0.5℃(from 34.5±0.7℃ to 35.6±0.5℃) in BPB and 0.6±0.3℃ (from 34.9±0.5℃ to 35.5±0.5℃) in SGB. The changes of skin temperature in both blocks were statistically significant(p<0.01), and the skin temper- atures after each procedure were revealed no significant difference(p=0.62). Conclusion: We thought that BPB produced sympathetic blockade on the upper extremi- ty as much as SGB. Moreover, it provides postoperative pain relief and may be employed as continuous method. So we suggest that continuous BPB could be used for hand surgery with many advantages.
Development of Thin and Lightweight Bulletproof Windows Using Strengthened SLS Glass by Ion Exchange
심규인,박중구,김성환,안덕래,최세영 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.2
Soda-lime silicate (SLS) glass was strengthened by ion exchange for application of thin and lightweight bulletproof windows. The optimal conditions for ion exchanged SLS glass (thickness of 3 and 10 mm) at 480oC were 10 and 17 min, respectively. TheVickers hardness values of the strengthened SLS glass samples with thicknesses of 3 and 10 mm were 5.9 ± 0.22 and 6.7 ± 0.17GPa, respectively, which values were about 22% higher than those of parent SLS glass. By laminating a multilayer defense filmand polycarbonate sheet with ion exchanged SLS glass, we were able to make a thin and lightweight bulletproof window (24.25mm, 4.57 kg, 50.06 kg/m2, V50 901.8 m/s). As a result, the thickness of the bulletproof window was decreased by about 39% from40 to 24.25 mm. The light transmittance in the visible range satisfied the standard (over 76%) for bulletproof windows.