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ZnSe 단결정에 대한 열자극 발광과 열자극 전류의 동시측정
전경남,유승철,고석룡,신용규,김택성,이춘호 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-
두 종류의 ZnSe 분말을 사용하여 sublimation 방법으로 성장한 ZnSe 단결정(as grown)에 대하여 TSC와 TSL을 동시 측정하였으며, PL과 DLTS를 측정하였다. PL 측정으로 I_1, I_2와 DAP 발광을 관측하였으며 DLTS에 의한 깊은준위를 관측하였다. TSL과 TSC의 동시 측정으로부터 얻은 그로우 곡선을 점근 해법으로 분해하여 세개의 준위를 얻었으며 그들의 활성화에너지값은 0.22 eV, 0.30 eV, 0.39 eV이었다. PL spectrum과 열자극 완화과정의 동시 측정 결과로부터 0.22 eV 근방에 impurity에 의한 주게준위와 native defect에 의한 받게준위가 각각 전도대의 아래와 가전자대의 위에 존재하는 것으로 판명되었다. DLTS 측정과 동시측정 결과로부터 0.30 eV와 0.39 eV의 준위는 V_se vacancy와 관련되는 주게 준위임을 알았다. Simultaneous measurements of TSL were carried out on ZnSe single crystals grown by high pressure Bridgman technique and the PL and DLTS signals were observed. Photoluminescence spectrum at 10 K on the ZnSe crystal reveals I_1 and I_2 lines, as well as DAP emission line. DLTS spectrum on the ZnSe crystal show electron trap at 0.33 eV. Two TSC and TSL peaks were observed near 215 K and 230 K, which are identified as having originated from two donor trap levels at 0.30 eV and 0.39 eV, respectively, below the bottom of the conduction band. We also observed single TSL and TSC peaks at 150 K which were identified as having originated from a donor and acceptor trap levels at about 0.22 eV below the conduction band and over the top of the valence band, respectively.
플라즈마 산화 처리된 65/35황동의 산소 분압별 부식특성에 관한 연구
박창규,안승호,김정구,정윤모,한전건 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.4
Brasses are the most widely used copper-based alloys because of the good corrosion resistance, formability, high strength and excellent hot-working properties. However, dezincification occurs when one or more components of an alloy are more susceptible to corrosion than the rest and, as a result, are preferentially dissolved. In order to enhance the corrosion resistance, the oxide film was deposited on the 65/35 brass by pulsed dc plasma oxidation with various pressure. The corrosion behavior of plasma oxidized brasses with various oxygen pressure was investigated by electrochemical methods (potentiodynamic polarization test, potentiostatic test, electrochemical impedance spectroscopy) and surface analyses (x-ray diffraction, scanning electron microscopy, auger electron spectroscopy, electron probe micro analyzer). Particular attention was paid to the effects of oxygen pressure and oxide thickness on the coating properties related to the corrosion behavior. From the results of electrochemical test, it was found that the oxidized brass under condition of 1.5 Torr oxygen pressure was effective in improving corrosion resistance. It was attributed to the protective oxidized layer (ZnO). Finally, an optimized oxidation condition for corrosion protection was found to be 1.5 Torr oxygen pressure and 1 pun thickness. (Received September 3, 2004)
Jeon, Seung Gyu,Choi, Eun Joo,Lee, Pyung Bok,Lee, Young Jae,Kim, Min Soo,Seo, Joung Hwa,Nahm, Francis Sahngun The Korean Pain Society 2014 The Korean Journal of Pain Vol.27 No.4
Background: The diagnostic criteria of complex regional pain syndrome (CRPS) have mainly focused on dichotomous (yes/no) categorization, which makes it difficult to compare the inter-patient's condition and to evaluate the intra-patient's subtle severity over the course of time. To overcome this limitation, many efforts have been made to create laboratory methods or scoring systems to reflect the severity of CRPS; measurement of the skin temperature asymmetry is one of the former, and the CRPS severity score (CSS) is one of the latter. However, there has been no study on the correlations among the CSS, temperature asymmetry and subjective pain score. The purpose of this study was to evaluate whether there is any correlation between the CSS, skin temperature asymmetry and subjective pain score. Methods: Patients affected with CRPS in a unilateral limb were included in this study. After making a diagnosis of CRPS according to the Budapest criteria, the CSS and skin temperature difference between the affected and unaffected limb (${\Delta}T$) was measured in each patient. Finally, we conducted a correlation analysis among the CSS, ${\Delta}T$ and visual analogue scale (VAS) score of the patients. Results: A total of 42 patients were included in this study. There was no significant correlation between the ${\Delta}T$ and VAS score (Spearman's rho = 0.066, P = 0.677). Also, the CSS and VAS score showed no significant correlation (Spearman's rho = 0.163, P = 0.303). Conclusions: The ${\Delta}T$ and CSS do not seem to reflect the degree of subjective pain in CRPS patients.
( Seung Gyu Jeon ),( Eun Joo Choi ),( Pyung Bok Lee ),( Young Jae Lee ),( Min Soo Kim ),( Joung Hwa Seo ),( Francis Sahngun Nahm ) 대한통증학회 2014 The Korean Journal of Pain Vol.27 No.4
Background:The diagnostic criteria of complex regional pain syndrome (CRPS) have mainly focused on dichotomous (yes/no) categorization, which makes it difficult to compare the inter-patient`s condition and to evaluate the intra-patient``s subtle severity over the course of time. To overcome this limitation, many efforts have been made to create laboratory methods or scoring systems to reflect the severity of CRPS; measurement of the skin temperature asymmetry is one of the former, and the CRPS severity score (CSS) is one of the latter. However, there has been no study on the correlations among the CSS, temperature asymmetry and subjective pain score. The purpose of this study was to evaluate whether there is any correlation between the CSS, skin temperature asymmetry and subjective pain score.Methods:Patients affected with CRPS in a unilateral limb were included in this study. After making a diagnosis of CRPS according to the Budapest criteria, the CSS and skin temperature difference between the affected and unaffected limb (ΔT) was measured in each patient. Finally, we conducted a correlation analysis among the CSS, ΔT and visual analogue scale (VAS) score of the patients.Results:A total of 42 patients were included in this study. There was no significant correlation between the ΔT and VAS score (Spearman`s rho = 0.066, P = 0.677). Also, the CSS and VAS score showed no significant correlation (Spearman`s rho = 0.163, P = 0.303).Conclusions:The ΔT and CSS do not seem to reflect the degree of subjective pain in CRPS patients. (Korean J Pain 2014; 27: 339-344)
전승규 ( Seung Gyu Jeon ),유병훈 ( Byung Hoon Yoo ),임윤희 ( Yun Hee Lim ),이상석 ( Sang Seok Lee ),홍기혁 ( Ki Hyuk Hong ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.1
An 11-year-old boy underwent thoracolumbar surgery to correct a deformity caused by congenital kyphoscoliosis from the 6th thoracic vertebra to the 2nd lumbar vertebra. During a screw insertion, some tore and cerebro-spinal fluid (CSF) leaked. After CSF leakage, the amplitude of the motor evoked potential in the left lower extremity was reduced by 90% compared to baseline value, but there was no nerve damage at the surgical site. His post-surgical mental status did not recover completely. Brain computed tomography revealed a subdural hemorrhage in the inter-hemispheric fissure, with both tentorium and right frontotemporooccipital and diffuse brain edema. On the 4th postoperative day, mental status recovered to near alertness, but upper motor strength was grade II, right lower motor strength was grade II and left lower motor strength was grade I. Right hemifacial palsy was also noted. At 2.5 months after surgery, right facial palsy remained, but motor function recovered to near normal levels with conservative care. (Korean J Anesthesiol 2009;56:116~9)