유리 기판에서 RF 마그네트론 스퍼터링법으로 증착한 비정질 투명전극 스트론튬 루세네이트 박막 두께에 따른 광학 및 전기적 특성

방효진(Hyo Jin Bang),김현민(Hyun Min Kim),이종훈(Jong Hoon Lee),안지훈(Ji-Hoon Ahn),김홍승(Hong Seung Kim) 한국물리학회 2022 새물리 Vol.72 No.10

스트론튬 루세네이트 (SrRuO₃)의 전극은 페로브스케이트 구조 유전체의 유전 특성을 향상시킬 수 있어 DRAM(Dynamic Random-Access Memory) 에 가장 적합한 전극 재료로 사용되고 있다. 이러한 장점들을 가지고 있는 스트론튬 루세네이트 (SrRuO₃) 박막이 투명 전극(Transparent Conductive Oxide; TCO) 으로의 사용 가능성을 확인해 보기 위해 연구하였다. 본 연구에서, 스트론튬 루세네이트(SrRuO₃) 박막을 유리 기판 위에 RF 마그네트론 스퍼터링 법으로 상온에서 증착 하였다. 박막의 두께에 따른 광학적 특성과 전기적 특성을 관찰하기 위하여 증착 시간을 5분과 50분으로 설정하여 실험을 진행하였다. 증착 시간이 증가할수록 박막 두께가 5nm에서 68nm로 증가하였고 광 투과율이 80%에서 40%로 감소하였다. 전기적 특성인 비저항은 박막 두께가 증가 하면서 1.99 mΩ·cm 에서 26.3 mΩ·cm 로 증가하였다. 결과적으로, 스트론튬 루세네이트(SrRuO₃) 박막을 유리 기판 위에 5분 증착 하였을 때, 약 80%이상의 투과율과 4.57eV의 밴드 갭, 그리고 1.99 mΩ·cm의 비저항을 보여주었다. The SrRuO₃ electrode can improve the dielectric properties of the perovskite structure. Thus, it is the most suitable electrode material for Dynamic Random-Access Memory (DRAM). This study was conducted to investigate the possibility of the SrRuO₃ thin film as a transparent conductive oxide (TCO). In this study, an SrRuO₃ thin film was deposited on the glass substrates by the RF magnetron sputtering method at room temperature. To observe the difference in optical and electrical properties as per the thin film thickness, the deposition times were set to 5 and 50 min. As the deposition time increased, the film thickness increased from 5 to 68 nm, the optical transmittance decreased from 80% to 40%, and the resistivity (an electrical property) increased from 1.99 to 26.3 mΩ·cm. Consequently, when the SrRuO₃ thin films were deposited on the glass substrates for 5 min, a transmittance of about 80% or more, a band gap of 4.57 eV, and a resistivity of 1.99 mΩ·cm were observed, thus verifying that an SrRuO₃ electrode can improve the dielectric properties of perovskite.

동종 탈회골의 크기가 유도골 형성에 미치는 영향에 관한 실험적 연구

엄인웅,이동근,민승기,방만혁 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.4

As early as 1889, treatment of ostemyelitis was reported using xenogeneic demineralized bone. In 1965, Urist discovered that demineralized long bone fragment, even when implanted in nonskeletal tissue, would stimulate osteogenesis. The clinical use of demineralized bone of Oral and Maxillofacial surgery is not new. The demineralized bone implants were used for 1) interposition within osteotomy gaps, cystic detects, alveolar clefts ; 2) augmentation, over intact bone surfaces ; 3) construction of new bone within soft tissue. Demineralized bone grafts invokes a induced osteogenesis which is transformation of host cells into osteoblasts. Demineralized bone has identified several factors that modulate the osteogeneic response : sterilization method, recipient age, particle size etc. Especially, pulverization of bone matrix may enhance its osteoinductive properties, to allow rapid, efficient bridging of large defects. the purpose of the present report was to describe the potential efficacy of demineralized allogeneic bone powder of skull of rabbits as a particle size ; 212 ㎛, 710㎛, 1 mm each other. Microscopic finding in our experimental studies shown that 710㎛ demineralized bone powder is the most potent osteogenic response, and then 212㎛, 1mm size. Densitometric analysis shown that density of all group was continue to increase until 4 weeks after operation, and then continue to decrease.

健康한 韓國人의 動脈血液 가스 및 酸一鹽基 平衡値에 對한 觀察

崔震守,曺方煥,朴喜淑,金顯承,金瑛,白正敏,徐錫助 순천향의과대학 1979 Journal of Soonchunhyang Medical Science Vol.2 No.3

The purpose of this paper is to make an attempt in this investigation to determine normal adult values of arterial blood gas and acid-base balance in 53 healthy Korean male and female subjects of varying age and then compare with the data obtained by others. Determinations of the acid-base status of the arterial blood were performed at 37℃ by the Astrup method using a radiometer instruments, consisted of BGA2A/3-MK 2 system. The mean and standard errors of each component were as follows: pH 7.42±0.043, oxygen saturation 96.96±0.089%, pO?? 97.66±0.91mmHg, pCO?? 37.08±0.68mmHg, CO?? content 24.29±0.43mM/L, bicarbonate 23.26±0.68mM/L, buffer base 46.56±0.66mEg/L, and base excess -0.024±0.001mEg/S. Compared with normal adult values in literatures, all the components of the data appear to be in the same range without any significant difference.

치면열구전색제의 조건에 따른 법랑질 결합강도에 관한 연구

이용근,이흥수,이성재,방기숙,최정민,류승호,강민석 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1

In this study, the shear bond strengths and accompanying elastic modulus ratio, displacement at bond failure and work up to fracture of pit and fissure sealants to toothe enamel were analyzed by the following variables, those were acid etching, moisture content of the surface of enamel, dentin bonding agent(species and method), thermocycling, saliva contamination. One kind of chemically cured resin based pit and fissure sealant, two kinds of light cured resin based pit and fissure sealants and one kind of glass ionomer based pit and fissure sealant, and two kinds of dentin bonding agents were studied. The buccal surface of extracted premolars were ground flat with # 600 silicone carbide papers, and the ground surface was treated depending on the experimental conditions. After each treatment, each pit and fissure sealant was filled into plastic tube of 3mm diameter, which were laid on the surface of ground enamel surface, and were cured. Sealant bonded teeth specimens were immersed in 37℃ distilled water form 24 hours. The shear bond strength of sealant to enamel surface was measured with Universal testing machine with the cross head speed of 1mm/min. From the obtained load-deflection curves, modulus ratio, bond strength, displacement at bond failure and work up to fracture were analyzed. From this experiment, the following results were obtained : 1. Comparing the results of standard condition(i. e. acid etching, dry surface, no dentin bonding agent and 300 thermocyling), the elastic modulus ratio of chemically cured resinbased pit and fissure sealant was significantly higher than those of other materials(P<0.05), and the bond strength, displacement at bond failure and work up to fracture of glass ionomer based pit and fissure sealant were significantly lower than those of other materials(P<0.05). 2. The results of ANOVA with the variables of type of material, acid etching, moisture condition of the enamel surface, dentin bonding agents were as follows ; 1) variables showed significant main effect on the shear bond strength of pit and fissure sealant to enamel(P<0.01), 2) type of material, acid etching and moisture condition of enamel influenced the bond strength significantly(P<0.01), 3) type and application methods of dentin bonding agents influenced on the bond strength significantly(P<0.05). 3. There were statistically significant correlation between the work up to fracture and the bond strength, and between the work up to fracture and the displacement at bond failure(P<0.01), and in these cases the correlation coefficient was 0.87.

감자 Polyphenol Oxidase의 열안정성

김나영(Na-Young Kim),이민경(Min-Kyung Lee),박인식(Inshik Park),방극승(Keuk-Seung Bang),김석환(Seok-Hwan Kim) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.5

감자로부터 polyphenol oxidase를 추출하여 열안정성에 영향을 주는 요인을 식품의 제조공정에 유용한 정보를 제공하기 위해 연구를 하였다. 감자의 PPO는 pH 7.0에서 가장 안정하였고, 이 효소는 80℃에서 1분간의 열처리로 효소 활성이 70% 저해되었다. 감자 PPO의 열안정성에 대한 z-value는 12.17±0.58℃이고, 이 효소의 열안정성은 sodium chloride의 첨가로 감소되었으며, 2-mercaptoethanol과 dithiothreitol과 같은 환원제의 첨가로 역시 효소활성이 저해되었다. Factors affecting thermostability of polyphenol oxidase (PPO) from potato were studied for the purpose of providing useful information for food processing operations. The enzyme was most stable at pH 7.0 and it was inhibited to 70% after heat treatment at 80℃ for 1 min. The z-value for the thermal inactivation of the PPO was 12.17±0.58℃. The thermostability of the enzyme was reduced by addition of sodium chloride. And the activity was inhibited by addition of reducing reagents such as 2-mercaptoethanol and dithiothreitol.

하악 우악부 골절의 구내접근법에 대한 임상적 평가

진국범,박경옥,이동근,장동호,민승기,방만혁 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

Recently, we have used internal fixation with titanium miniplate which introduced by Champy in 1976 in facial bone fractures. In cases of mandibular fractures, particulary mandibular angle fractures, we usually underwent the open reduction extraorally. But extraoral approaches may leave scars and put the facial nerve at greater risk. So, we had undergone the intraoral approaches in 31 patients of mandibular angle fractures (male : 29, female : 2)> These patients visited in Wonkwang university hospital from October 1991 to June 1993. We got easy operation time as average 20 minutes than extraoral approach. And reduced the postoperative nerve injury(14.2%), but postoperative infection is 6.1% nearly as same as extraoral approach. TMJ problems after intraoral open reduction was similar to extraoral approaches.

Free Paper Session : Lower Gastrointestinal Tract 1 ; Clinical Trial Of The "MiRO" Capsule Endoscope For The Evaluation Of Safety And Diagnostic Efficacy In Gastrointestinal Diseases

( Seung Min Bang ),( Jung Youp Park ),( Suck Chung ),( Don Haeng Lee ),( Si Young Song ) 대한소화기학회 2007 SIDDS Vol.9 No.-

Background/Aims: From 2000, we have developed new concepted-base mode capsule endoscope as a Frontier 21 Project of Korea. With the base band mode, bidirectional telemetry can be possible, which seems to be needed for real-time inspection and locomtion controllable capsule. So, we performed multicenter clinical trial for the evaluation of safety and diagnostic feasibility of MiRO. Methods: 49 healthy volunteers were enrolled in two hospitals. For the evaluation of diagnostic efficacy of MiRO, we analysed transmission rate of captured images, and the inspection rate of entire small bowel, and the quality of the transmitted image. The quality of transmitted images was graded as outstanding, excellent, good at average, below average, and poor. Results: Among the 49 volunteers, 45 were included in the clinical trials and the remaining 4 excluded due to abnormalities on base-line study. In the aspect of safety, any abnormalities in the cardiac conduction system were not founded in 24-hour holter and ECG. Only one volunteer complained of chest discomfort during the passage of MiRO on distal jejunum. No one reported gastrointestinal abnormalities, and any adverse effects of neuromuscular system such as involuntary movement. All test capsules were expelled through the anus within 3 days. In the aspect of diagnostic feasibility, the entire small bowel could be explored in all cases. The transmission rate of captured image in stomach, small bowel and colon were more than 97% (99.5%, 99.6% and 97.2%, respectively). The mean total duration of image transmission was 8 hour and 7 minute. The mean transit time of entire small bowel was 4 hour and 33 minute. In the 41 cases (91.1%), the quality of he images was graded more than the level of good at average. And abnormal findings of small bowel were found in 13 cases (4 of lymphangiectasia, 4 of lymphoid hyperplasin and 4 of polyps). Conclusions: In this human trial, we find that the base band moded capsule endoscope-MiRO is very safe and effective for exploring the entire small bowel.

Screening and Selection of Acaropathogenic Fungi Against Rhizoglyphus echinopus (Acari: Acaridae)

Seung-Hyun Ko,Tae-Young Shin,Sung-Min Bae,Jae-Bang Choi,Won-Woo Lee,Soo-Dong Woo 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05

The bulb mite (Rhizoglyphus echinopus) is damage garlic, shallot, onion in the bulbs, corms, tubers. It has recently become a serious problem because of the continuous use of acaricides resulting in resistance among bulb mite population. Thus, there is need to find alternative control measures to suppress bulb mite population. Initial screenings were performed using 352 isolates of pathogenic fungi from Korea soils. As results, 9 strains of acaropathogenic fungi were cadavers of bulb mite supporting fungal conidiation. These isolated were identified as 8 strains of Metarhizium anisopliae (4-1, 4-3-1, 4-3-2, 4-8-1, 4-4-1, 4-14-2, 4-16-1,and 4-31-2), 2 strains of Beauveria bassiana (4-4-2) by microscopic examination and genetic sequencing of the ITS region. However, ITS sequence analysis was consistent with the Metarhizium anisopliae (4-1, 4-3-1, 4-4-1, 4-31-2; a, 4-8-1, 4-14-2, 4-16-1; b, 4-3-2; c). Therefore, genetic diversity of selected in vitro isolates was characterized by Universally Primed (UP) PCR. The divided with Metarhizium anisopliae 4strain by UP-PCR. Of the 5stain isolation tested, 5stain resulted in mortality rates ≥20% within 6 days and all fungal treatment was detected mycosis. Thus these species of acaropathogenic fungi can be considered promising for biological control of bulb mite.

Structural Topology Design Considering Reliability

Min, Seung Jae,Bang, Seung Hyun Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.297 No.-

<P>In the design optimization process design variables are selected in the deterministic way though those have uncertainties in nature. To consider variances in design variables reliability-based design optimization problem is formulated by introducing the probability distribution function. The concept of reliability has been applied to the topology optimization based on a reliability index approach or a performance measure approach. Since these approaches, called double-loop singlevariable approach, requires the nested optimization problem to obtain the most probable point in the probabilistic design domain, the time for the entire process makes the practical use infeasible. In this work, new reliability-based topology optimization method is proposed by utilizing single-loop singlevariable approach, which approximates searching the most probable point analytically, to reduce the time cost and dealing with several constraints to handle practical design requirements. The density method in topology optimization including SLP (Sequential Linear Programming) algorithm is implemented with object-oriented programming. To examine uncertainties in the topology design of a structure, the modulus of elasticity of the material and applied loadings are considered as probabilistic design variables. The results of a design example show that the proposed method provides efficiency curtailing the time for the optimization process and accuracy satisfying the specified reliability.</P>

Occurrence and Prevalence of Honeybee Disease in Apis mellifera and Apis cerana in Korea

Seung-Won Kang,Mi-Sun Yoo,Jin-Hyeong Noh,Hyo Seon Park,il Min,Dong-Min Jeon,Su Chin Park,Mi Seong Lee,Young Un Hong,Sang Young Bang,Eun Hee Jang,Min Kwon Lee,Jong Sik Park,Myeong-Ho Jeong,Kwang Jung,M 한국양봉학회 2012 韓國養蜂學會誌 Vol.27 No.3