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SrTiO₃첨가에 따른 (x)BaTiO₃-(1-x)SrTiO₃의 유전적, 전기적 특성
정해덕,장동환,김덕근,홍경진,최창주 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-
In this paper, a ferroelectric material BaTiO3 was added to SrTiO3, then (x)BaTiO3-(1-x)SrTiO3(0.7≤x≤1) ceramics were fabricated with stable electrical properties in high voltage. Microstructures and electrical properties were investigated according to mixing conditions of addition material SrTiO3. As a result of the investigation of all experiments, the shrinkage was excellent in 0.9BaTioO3-0.1SrTiO3. The grain size was increased, the curie temperature was shifted low temperature. The 0.9BaTiO3-0.1SrTiO3 was appeared stable property in temperature vs. permittivity. Also, 0.9BaTiO3-0.1SrTiO3 was showed stable dielectric properties at 25~85[C]. V-I properties of specimen were observed in the temperature range of 21~143[C], were divided into three regions. the region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.
정전 열 접합을 이용한 Multi-Substrate Bonding
이덕중,주병권,최우범,한정인,조경익,이광배,장진,오명환 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
We performed silicon-to-glass bonding using silicon direct bonding followed by anodic bonding(SDAB). Initial bonding between glass and silicon was caused by the hydrophilic surfaces of silicon and glass ensemble using silicon direct bonding(SDB) method. We found that the bonded specimen using SDAB process had higher strength than one using anodic bonding process only. We performed multiple layer bonding by SDAB, which is glass- silicon -glass as sandwich structure. In the silicon wafer, the (1mm x 2mm x 500μm)-sized cavity was formed by the anisotropic etching of the silicon substrate in EPW(Ethylendiamin-Pyrocatechol-Water). And, the cavity was sealed with glass wafers by SDAB method.
원적외선 온열요법이 혈액투석 환자의 혈관통로 기능에 미치는 효과
최향미 ( Hyang Mi Choi ),최은덕 ( Eun Duck Choi ),장소형 ( So Hyeong Jang ),김은희 ( Eun Hee Kim ),최미정 ( Mi Jung Choi ),백송이 ( Song Yi Back ),한복희 ( Bok Hee Han ) 병원간호사회 2015 임상간호연구 Vol.21 No.2
Purpose: For hemodialysis, a vascular access which can maintain a certain speed for a long time is required. The prevention of the vascular access dysfunction is very important to decrease morbidity and to improvethe quality of life of patients receiving hemodialysis It is reported that far infrared heat increases the blood flow by expanding capillaries and micro-arteriovenouses. This study aimed to evaluate the effect of far infrared heat therapy as a new nursing intervention for maintaining vascular access function and improving the blood flow of patients receiving hemodialysis. Methods: The quasi-experimental research of nonequivalent control group pre-post test design was carried out for 59 patients receiving hemodialysis 3 times per week at K medical center. A far infrared heat was applied to the experimental group for 3 months. Results: The arteriovenous fistula blood flow of the experimental group (far infrared heat therapy group) increased significantly when compared to the control group (p=.047). However, static intra-access pressure ratio(SIAPR)was not different statistically (p=.101). Conclusion: The far infrared therapy could be considered as nursing intervention of choice as it demonstrated increase in the arteriovenous fistula blood flow in the patients receiving hemodialysis.
국내 유통 소금 중의 포타슘시아니이드와 페로시아나이드염의 분석에 관한 연구
허숙진,소유섭,최장덕,이화정,최선희,성준현,임무혁,김광수,최용훈,오해성,최정희,최정실,허옥순,이진하,신동우,신현수,문병우 식품의약품안전청 2001 식품의약품안전청 연보 Vol.5 No.-
본 연구는 국내 유통 소금중의 안전성을 규명하기 위하여 천일염 54건, 재제염 보건, 가공염 33건 등 총 143건에 대하여 숲행하였다. HPLC, ICP, Mercury Analyzer 등을 이용하여 KCN, 페로시아나이드 염, 납 등 6개 성분의 항량을 측정하였으며 그 결과는 다음과 같다. [rdn-max(mean) ; m곱3 ; f(CN : ND-ND(ND), 페로시아나이드염 : ND-ND(ND), Pb . ND-1.30 (0.331), Cd :ND-0.23(0.070), Hg ND-0.35(0,035), As :ND-1.52fo.062). 또한, 신속하고도 효율적이 면서 기존의 환경부 시안분석법의 단점을 보완할 수 있는 KCN과 페로시아나이드염의 분석 조건을 계시하였으며, 천일염, 재제염, 가공염 뿐만아니라 소금이 첨가된 식품까지도 적용하기 위한 기초 자료로 활용이 가능할 것으로 사료된다. This study was conducted to confirm the safety in a total of 143 samples of salts. The contents of potassium cyanide(KCN), potassium ferrocyanide(K_(4)Fe(CN)_(6)), lead(Pb), cadmium(Cd), mercury(Hg), and arsenic(As) were determined using a high performance liquid chromatograph(HPLC), inductively coupled plasma spectrometer(ICP), and mercury analyzer. The values of cyanide complexes and metal elements in salts were as follow [min-max(mean);mg/kg] ; KCN : ND-ND(ND), Ferrocyanide salt : ND-ND(ND), Pb : ND-1.30(0.331), Cd: ND-0.23(0.070), Hg : ND-0.35(0.035), As : ND-1.52(0.062). In this study, we established efficient
Choi, Ji-Young,Kim, Dong Ki,Kim, Yang-Wook,Yoo, Tae-Hyun,Lee, Jung Pyo,Chung, Hyun Chul,Cho, Kyu Hyang,An, Won Suk,Lee, Duk-Hyun,Jung, Hee-Yeon,Cho, Jang-Hee,Kim, Chan-Duck,Kim, Yong-Lim,Park, Sun-Hee The Korean Academy of Medical Sciences 2018 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.33 No.9
<P><B>Background</B></P><P>Appropriate immunosuppressive therapy for patients with idiopathic membranous nephropathy (MN) remains controversial. The effect of mycophenolate mofetil (MMF) versus cyclosporine (CsA) combined with low-dose corticosteroids was evaluated in patients with idiopathic MN in a multi-center randomized trial (NCT01282073).</P><P><B>Methods</B></P><P>A total of 39 biopsy-proven idiopathic MN patients with severe proteinuria were randomly assigned to receive MMF combined with low-dose corticosteroids (MMF group) versus CsA combined with low-dose corticosteroids (CsA group), respectively, and followed up for 48 weeks. Complete or partial remission rate of proteinuria and estimated glomerular filtration rate (eGFR) at 48 weeks were compared.</P><P><B>Results</B></P><P>The level of proteinuria at baseline and at 48 weeks was 8.9 ± 5.9 and 2.1 ± 3.1 g/day, respectively, in the MMF group compared to 8.4 ± 3.5 and 3.2 ± 5.7 g/day, respectively, in the CsA group. In total, 76.1% of the MMF group and 66.7% of the CsA group achieved remission at 48 weeks (95% confidence interval, −0.18 to 0.38). There was no difference in eGFR between the two groups. Anti-phospholipase A2 receptor Ab levels at baseline decreased at 48 weeks in the complete or partial remission group (<I>P</I> = 0.001), but were unchanged in the no-response group. There were no significant differences between the two groups in changes in the Gastrointestinal Symptom Rating Scale and Gastrointestinal Quality of Life Index scores from baseline to 48 weeks.</P><P><B>Conclusion</B></P><P>In combination with low-dose corticosteroids, the effect of MMF may not be inferior to that of CsA in patients with idiopathic MN, with similar adverse effects including gastrointestinal symptoms.</P><P><B>Trial Registration</B></P><P>ClinicalTrials.gov Identifier: NCT01282073</P>
장태식,민병국,석종식,최덕영 대한신경외과학회 1993 Journal of Korean neurosurgical society Vol.22 No.4
The anterior middle fossa is the most common location of benign intracranial arachnoid cysts. In the adult. headache. temporal bulging and mild proptosis are the usual presenting complaints, although seizures and contralateral weakness have been described Bitemporal hemianopsia associated with this lesion has not been noted previously. Herein we describe the patient with bitemporal hemianopsia associated with sylvian fissure arachnoid cyst Cystoperitoneal shunt was beneficial. The etiology, histology, and suggested therapy of other patient with arachnooid cyst are also discussed
장지수,석종식,최덕영,임광세 대한신경외과학회 1985 Journal of Korean neurosurgical society Vol.14 No.3
Fracture involving the sella turcica is a rare complication of head injury but draws attention of neurosurgeon because it can result in serious neurological, vascular and endocrine complications. Anatomically the sella being located central within the extensive basal dural attachments to the cranial vault, shearing force is transmitted directly to this structure and results in isolated compications. We recently experienced a case of fractured dorsum sellae complicated with cranial nerve palsy and report here with some references,
Fimasartan attenuates renal ischemia-reperfusion injury by modulating inflammation-related apoptosis
Jang-Hee Cho,Soon-Youn Choi,Hye-Myung Ryu,Eun-Joo Oh,Ju-Min Yook,Ji-Sun Ahn,Hee-Yeon Jung,Ji-Young Choi,Sun -Hee Park,Chan-Duck Kim,Yong-Lim Kim 대한생리학회-대한약리학회 2018 The Korean Journal of Physiology & Pharmacology Vol.22 No.6
Fimasartan, a new angiotensin II receptor antagonist, reduces myocyte damage and stabilizes atherosclerotic plaque through its anti-inflammatory effect in animal studies. We investigated the protective effects of pretreatment with fimasartan on ischemia-reperfusion injury (IRI) in a mouse model of ischemic renal damage. C57BL/6 mice were pretreated with or without 5 (IR-F5) or 10 (IR-F10) mg/kg/day fimasartan for 3 days. Renal ischemia was induced by clamping bilateral renal vascular pedicles for 30 min. Histology, pro-inflammatory cytokines, and apoptosis assays were evaluated 24 h after IRI. Compared to the untreated group, blood urea nitrogen and serum creatinine levels were significantly lower in the IR-F10 group. IR-F10 kidneys showed less tubular necrosis and interstitial fibrosis than untreated kidneys. The expression of F4/80, a macrophage infiltration marker, and tumor necrosis factor (TNF)-α, decreased in the IR-F10 group. High-dose fimasartan treatment attenuated the upregulation of TNF-α, interleukin (IL)-1β, and IL-6 in ischemic kidneys. Fewer TUNEL positive cells were observed in IR-F10 compared to control mice. Fimasartan caused a significant decrease in caspase-3 activity and the level of Bax, and increased the Bcl-2 level. Fimasartan preserved renal function and tubular architecture from IRI in a mouse ischemic renal injury model. Fimasartan also attenuated upregulation of inflammatory cytokines and decreased apoptosis of renal tubular cells. Our results suggest that fimasartan inhibited the process of tubular injury by preventing apoptosis induced by the inflammatory pathway.
Duck K. Choi,Sung Kwun Chough,Yi Kyun Kwon,Seung-Bae Lee,Jusun Woo,Imseong Kang,Hyun Suk Lee,Sang Min Lee,Jang Won Sohn,Young Jae Shinn,Dong-Jin Lee 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.2
The Taebaek Group (Cambrian-Ordovician) in theTaebaeksan Basin comprises mixed carbonate-siliciclastic sequenceand is exposed well in the Seokgaejae section located in the central-eastern part of the Korean Peninsula. The group in the Seokgaejaesection consists of in ascending order the Myeonsan, Myobong,and Duwibong formations. This study describes in detail the well-exposed outcrop sections of the Taebaek Group in the SeokgaejaePass in order to refine the lithostratigraphy of the lower Paleozoicstrata in the Taebaeksan Basin, Korea. The refined lithostratigra-phy delineates clearly the lithologic boundary between the Myobongand Daegi formations, the Hwajeol and Dongjeom formations, theDumugol and Makgol formations, and the Makgol and Jigunsanformations. The preliminary information on trilobite faunal asem-blages suggests that the Cambrian-Ordovician boundary can beplaced within the lowermost part of the Dongjeom Formation.