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Min-Seok Oh,Sang-Guei Lee,Ju-Hyun Jeon,Hoi-Seon Lee 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
To response evaluation of high power light emitting diodes (HPLEDs) as potential attractants to the Spodoptera exigua adults, we investigated the attractiveness of specific wavelength, illuminance intensity and light-exposure time, and compared them to the fluorescent. The all light treatments with the 40 lux intensity attracted the significantly highest number of S. exigua. The optimal light-exposure time exhibited the highest attraction rate at the 60 min. When the attraction and repellent rate in the optimal conditions to the S. exigua was surveyed, the white HPLED exhibited the highest attraction rate (91.1%), whereas the red HPLED exhibited the most repellent rate (33.3%). When evatuated of illuminance efficiency with fluorescent as control, white and red HPLED were found to be 9.14 and 10.34 times more efficient than fluorescent. These data clearly show that both the 40 lux intensity and the 60 min light-exposure time by using the white HPLED was the most suitable for attraction of the S. exigua.
( Min Seok Oh ),( Chi Hoon Lee ),( Sang Guei Lee ),( Hoi Seon Lee ) 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.3
To evaluate high-power light-emitting diodes (HPLEDs) as potential attractants for Spodoptera exigua adults, attractiveness of specific wavelengths, illuminance intensity, and light-exposure times were investigated and compared to that of fluorescent light. The white light (40 lux treatment) attracted significantly more S. exigua than other attractants. The optimal light-exposure time, based on the highest attraction rate, was 60 min. Evaluation of attraction and repellent rates under optimal conditions showed the white HPLED had the highest attraction rate (91.1%), and the red HPLED had the highest repellence rate (33.3%). Based on relative efficiency values, the white HPLED was about 9.14 times as efficient as the fluorescent light. These data clearly showed that S. exigua showed the greatest attraction to the white HPLED at 40 lux intensity and 60 min light-exposure time.
三相誘導電動機 固定子捲線의 溫度上昇測定에 對한 硏究 (Ⅰ)
金玟會 영남이공대학 1980 論文集 Vol.9 No.-
In order to measure temperature rising in the stator winding of 3phase induction motor, it is necessary to normal loading (brake or generator). If it is utilize to new test method that two indentical mcchines are connentcd electrically (only) together and their losses are supplied externally, rate loading do not have to be mechanically coupled either to each other or to a third machine. In this principle, we can be temperature rising test in the stator winding of induction motors on the operating condition.
산성안개가 내후성강재의 녹형성 및 피로강도에 미치는 영향
김민건,구은희 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.B
The purpose of this study is to investigate the effect of acid fog on the rust formation behavior of weathering steel (SMA50) which is used in uncoated bridges. Weathering steel didn't form the passive film under the environment of acid fog(pH5,6), whereas the environment of distilled water formed the protective oxide film. Therefore, the construction of weathering steel under the environment extremely exposed to SOx and NOx which are the main compositions of acid fog is not adequate. Fatigue limits of weathering steel under acid fog environment are remarkably decreased as compared with environment of distilled water. The corrosive constituents in acid fog has piled up the corrosion products on specimen surface and generated the corrosion pits. Because of the high stress concentration arising at this corrosion pit, relatively low fatigue limits were obtained for acid fog specimens.
티타늄 임플랜트의 표면 마무리 상태 및 NaOH 수용액 침적이 유사체액 중에서의 인산칼슘 석출에 미치는 영향
정회웅,최규형,이민호,배태성 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.3
The purpose of this study was to examine whether the precipitation of calcium phosphate on titanium implant are affected by surface modification. To improve the bone conductivity of the Cheil implant(Cheil Pharma & Instrument Inc), samples were divided into 3 groups. Group 1 was untreated, group 2 was immersed in 5M-NaOH solution at 60℃ for 24 hours, and group 3 was immersed in 5M-NaOH solution at 60℃ for 24 hours and heat-treated at 600℃ for 1 hour. And then, all specimens were immersed in the MEM Eagle's medium whose composition was similar to that of extracellular fluid for 30 days. After immersion, the surfaces were observed with scanning electron microscope. The results obtained were summarized as follows; 1. The surface of Branemark implant showed more regular and smooth machined surface than that of Cheil implant. 2. The precipitation of the calcium phosphate on implant surface was increased by the immersion in the NaOH solution, and more highly accelerated by heat treatment. 3. The precipitation of the calcium phosphate on titanium implant was lower than that on the polished titanium surface.
티타늄 임플란트의 수산화칼륨 처리가 인산칼슘의 석출 및 조직적합성에 미치는 영향
정회웅,원대희,배태성,이민호 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.3
This study was performed to examine whether the precipitation of calcium phosphate and tissue compatibility of titanium implant are affected by the surface modification of potassium hydroxide treatment. Titanium plates of 10×10×1 mm in dimensions were polished sequentially from #600 to #2,000 emery paper and one surface of each specimen was received an additional polioshing sequence through 0.1㎛ alumina paste. Specimens were soaked in 0.1∼10.0 M KOH solutions at 60℃ for 24 hours and 5.0 M KOH-treated group was heated at 400∼800℃ for 1 hour. All specimens were soaked in the Hanks' solution with pH 7.4 at 36.5℃ for 30 days, and the surfaces were examined with X-ray diffractometer, scanning electron microscope (SEM) and X-ray photoemission spectroscopy (XPS). To evaluate the tissue compatibility of KOH-treated titanium, STS316L, untreated titanium and KOH-treated titanium were implanted into abdominal connective tissue sites of rats for 3 months. After removing the implants, abdominal tissue sites were fixed and prepared histologically for microscopic observation. It was characterized by the presence of connective tissue with fibrous capsule surrounding the implant and macrophages. Potassium titanate hydrogel layer, which can accelerate the formation of bonelike apatite layer on titanium surface, was obtained with the immersion in KOH solution. Precipitation of calcium phosphate on titanium surface was densified with the immersion in 5.0M KOH solution and heat treatment at 600℃. Number of macrophages in connective tissue site of 0.95 mm2, which is known to increase with the inflammation reaction proceeds, was significantly decreased as the alkali & heat treatment of titanium surface (p<0.01). The thickness of the fibrous capsule formed around the implant body was significantly decreased with the alkali and heat treatment of titanium surface (p<0.01).
수종의 구강위생 방법에 따른 인공 초기 우식법랑질의 재석회화에 관한 비교 생체연구
정희민,김용기 大韓小兒齒科學會 1991 大韓小兒齒科學會誌 Vol.18 No.1
With a view to evaluating the effect og topical fluoride application in vivo,enamel slabs taken from artificial carious lesion produced by Hydroxuethylcellulose system were mounted in acrylic mandibular removable appliances and worn by 4 male subjects for two weeks.Control subjects brushed 4 times a day with non-fluoridated dentifrice.Experimental subjects also brushed 4 time a day but wash MFP dentifrice(G2),plus 0.05% NaF mouthrinsing(G3) or with MFP dentifrice plus 0.05% NaF mouthrinsing.After performing different oral hygiene regimen,surface morphology and histological profile in depth along with Ca,P content in layers were studies using SEM,polarizing light microscope,EPMA,EDX and WDX. The results were as follows: 1.Remineralized lesion in all groups showed smoother and less porous surface than original carious enamel lesion. 2.Under polarzing light microscope,artificial carious lesion showed typical subsurface demineralization; The lesion body showed positive birefringence,and the inner sound enamel and intact surface layer showed negative birefringence.When compared to the original lesions,remineralized artificial carious lesion showed decresed lesion depth with increased thickness of intact surface.This features were more distinct in the case of topical fluoride application group(group 2,3,4).The body of remineralized lesion in group 1,2 revealed continuous pattern,whereas group 3 and 4 showed interruped charicter. 3.From Ca & P profile analyzed by WDX,maximum mineral loss of most lesions was showen to be detected at around the area of 80㎛ from surface roughly.The intergroup rank of remineralizing rate besed on WDX data in descending order was group 4,3,2 and 1.
X-band 주파수대역에서 동작하는 다이오드 주파수 혼합기 설계 및 제작
정민규,서영석,안창회 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
In this paper reports on the design and performance of microstrip single balanced diode mixer, using GaAs Schottky diode, at X-band. A single balanced diode mixer is designed and implemented using Harmonic balance simulation(MW-office). The diode model parameters are extracted by SPICE model of diode. The diode impedances for the LO, RF, and IF frequencies and Powers are calculated for diode matching network design. The mixer consists of branch line coupler, Low pass filter and RF&LO choke for bias circuit. The Passive circuits are simulated for accuracy by EM-simulation of MW-office. The Mixer requires 10dBm local oscillator(LO) power without dc bias and achieves a conversion loss of about 7.5dB, 17dB LO-to-RF isolation, 40dB LO-to-IF isolation, 30dB RF-to-IF isolation, and 1.16 LO VSWR.
수종의 구강위생 방법에 따른 인공 초기 우식법랑질의 재석회화에 관한 비교 생체연구
정회민,김용기 단국대학교 치의학연구소 1991 논문집 Vol.3 No.-
With a view to evaluating the effect of topical fluoride application in vivo, enamel slabs taken from artificial carious lesion produced by Hydroxyethylcellulose system were mounted in acrylic mandibular removalbe appliances and worn by 4 male subjects for two weeks. Control subjects brushed 4 times a day with non-fluoridated dentifrice. Experimental subjects also brushed 4 times a day but wash MFP dentifrice(G2), plus 0.05% NaF mouthrinsing(G3) or with MFP dentifrice plus 0.05% NaF mouthrinsing. After performing different oral hygiene regimen, surface morphology and histological profile in depth along with Ca, P content in layers were studies using SEM, polarizing light microscope, EPMA, EDX and WDX. The results were as follows ; 1. Remineralized lesion in all groups showed smoother and less porous surface than original carious enamel lesion. 2. Under polarizing light microscope, artificial carious lesions showed typical subsurface demineralization; The lesion body showed positive birefringence, and the inner sound enamel and intact surface layer showed negative birefringence. When compared to the original lesions, remineralized artificial carious lesion showed decreased lesion depth with increased thickness of intact surface. This features were more distinct in the case of topical fluoride application groups(group 2, 3, 4). The body of remineralized lesion in group 1, 2 revealed continuous pattern, whereas group 3 and 4 showed interrupted charicter. 3. From Ca & P profile analyzed by WDX, maximum mineral loss of most lesions was shown to be detected at around the area of 80㎛ from surface roughly. The intergroup rank of remineralizing rate based on WDX data in descending order was group 4, 3, 2 and 1.