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玄蔘의 Saponin 成分 檢索 : on the Saponin of the Radix
남인숙,배병숙,최보향,최인수,최태수,김동언,김언주,정미영,조규옥 曉星女子大學校 藥學大學 學生會 1988 曉星藥誌 Vol.4 No.-
Crude saponin(100g) were obtained by extracting the radix(5kg) of Scrophalariae koraiensis Nakai. Crude saponin were positive in the Liebermann-Burchard test. We observed 5 sports by TLC using BuOH saturated with H_2O : ethyl acetate : water(4:1:5, upper phase) as solvent and 1% Ce(SO_4)_2 in 10% H_2SO_4 as a color former. We divided into 3 fractions by common column chromatography using BuOH saturated with H_2O : ethylacetate : water(4:1:5, upper phase) as solvent.
김민주,이승수,전언찬 동아대학교 2001 大學院論文集 Vol.26 No.-
As high-precision parts are needed with manufacturing techniques improved, the demand of high-precision machine tools has been increasing. They are made to develope the precision measuring skill to maintenance the accuracy of themselves as a matter of course. We on the paper measured straightness and squareness of the square to verify that it is possible for CT(circular test) method by 2-dimensional probe and the square to measure squareness. Furthermore, we compared the result of the study with the computer simulation's to prove its possibility, and made an improvement of measuring method.
김순경,전언찬,이승수,김문경 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2
Work rolls used in cold rolling mills must have outstanding wear resistance and very little plastic deformation. Thus, these rolls require a higher surface hardness and hardening to a greater depth. To meet these requrements, the rolls, in general, have basic chemical composition of 0.7 to 1.0% carbon and 1.0 to 5.0% chromium(Cr), plus a small amounts of special elements, and are subjected to intensive water quenching and tempering at low temperature to provide a surface hardness of over 90 shore. This test results are as follows. Deflection and fracture load of 5% Cr material are than those of 3% Cr material and show flat curve from surface to subsurface. It will be clear that 5% Cr work roll has a superior resistibility against wear and abrasion comparing with 3% Cr work roll. The improvement of wear and abration in 5% Cr work roll will be achieved by the large amount of spheroidal carbide. In grindability and polish, 5% Cr work roll will be a little inferior comparing with 3% Cr work roll.
레이저를 이용한 머시닝 센터의 테이블과 지지축의 휨에 관한 연구
김민주,이승수,김순경,전언찬 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
The acceleration of the performance of machine tools influences the deveopment of the semiconductor and optical technology as the development of NC and measurement technology. We can mention that a traction role of the acceleration for the development like that depends on the development of the measurement technics Stylus instrument method, STM, SEM, Laser interferometer method which are used for measuring the movement accuracy of machine tools. The movement error factors in movement accuracy are expressed as yaw, roll, and pitch etc. Machining center has 21 movement error factors including of 3 axies joint errors because that has 3 axies and has been measured as the standard of the unloaded condition until now inspite of getting static, dynamic, and servo-gain errors in the case of expending the error range. Therefore, this study tries to measure deflection value according to loading on the X-Y table of the machining center after compensation of straightness. And the equipment used for this study is HP 5529A laser measurement.
원호검사법을 이용한 진원도 측정 방법의 개선에 관한 연구
이승수,김민주,전언찬 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
A study for the circularity of machine tool is classified into two ways. One is to measure the circularity of machine tool by a existing measuring device. The other is to measure the circularity by remodeling the existing measuring device. We will improve on measurement of circularity using circular test method by a two-dimensional probe and a master ring for machining tools and investigate influence of trigger method, acceleration, data sampling.
鄭守泰,金康彦,柳志久 釜山工業大學校 1994 論文集 Vol.36 No.-
Vertical Hall devices to dectect a horizontal magnetic field on a chip surface are produced using a bipolar technology. A type B sample is about 1.2 times as sensitive as a type A sample and both samples have good linearity on the Hall voltage in respect to a magnetic fields. A magneto-operational amplifiler(MOP0 is implemented using vertical Hall device, which shows good linearity and switching characteristics. Also we showed that magnetic detections with multifunctions can be accomplished by inserting feedback elements in the MOP.
Pb(Ni₁/₃ Nb₂/₃)O₃ 세라믹스에 있어서 페롭스카이트상의 생성과 유전특성
정수태,류지구,김강언 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2
The reaction sequences of the 3PbO-NiO-Nb?O? [PNN1] and 3PbO-NiNb₂O? [PNN2] system and their dielectric properties were investigated. The pyrochlore phase of PNN1 formed in the order of Pb₃Nb₂O?, Pb?Nb₄O₁?? and Pb₃Nb₄O₁₃ according to increasing of a reaction temperature, and that of PNN2 formed only a Pb₃Nb₄O₁₃. The perovskite phase of Pb(Ni₁/₃Nb₂/₃)O₃[PNN] formed at 920℃ through the diffusion of NiO into the pyrochlore phase of Pb₃Nb₄O₁₃ on both PNN1 and PNN2, but PNN1 showed about 40% of the pyrochlore phase and PNN2 showed about 10% of it.When the samples sintered for 1 hour at 920℃ after calined for 1 hour at 850℃, the PNN1 sample showed yet about 18% of pyrochlore phase, While the PNN2 sample showed 100% of perovskite phase. The PNN2 sample(pyrochlore phase free) had a 1.5 times of maximum dielectric constant and a 0.1 times of dissipation loss(room temperature) compared to the PNN1 sample(pyrochlore phase not free)
16S rRNA와 16S-23S rRNA Gene Sequence Analysis을 이용한 물김치와 동치미 유산균의 분리 동정
설수연,김태운,김성언,김해영 경희대학교식량자원개발연구소 2007 硏究論文集 Vol.26 No.1
This study was carried out to identify lactic acid bacteria in Mul-Kimchi and Dongchimi using by 16S rRNA and 16S-23S gene sequence analysis. Diluted Mul-Kimchi and Dongchimi soup were plated on the MRS agar media and colonies obtained were used for 16S rRNA and 16S-23S rRNA gene sequence analysis. Genomic DNAs were extracted from the isolated lactic acid bacteria and used as a template for PCR amplification. Universal primer sets based on the 16S rRNA and 16S-23S intergenic spacer region genes were used for amplification. From the sequencing of PCR products, Weissella kimchii, Weissella cibaria, Leuconostoc lactis, Leuconostoc citreum and Leuconostoc garlicum were identified.
국산 다이아몬드 리머를 사용한 호닝 가공에서 구멍의 정밀도 측정을 통한 공구 성능에 관한 연구
이승수,김민주,전언찬 동아대학교 2001 大學院論文集 Vol.26 No.-
Manufactured goods, is a complicated form, little capicity and many kind, usually is cut by a simple tool which has high work efficiency. The tool for cutting work is generally necessary for 3∼4 times higher hardness than normal cutting material but a tool for cutting a cemented carbide doesn't exist except a diamond or CBN tool. Especially, a diamond tool has a specific property that wearing resistance is decreased by high-tempareture carbonization and the price of diamond or CBN tool is so expensive that to find the cutting condition for cuffing a cemented carbide is very important. The most hydraulic valve, multi-stage hole work, require the exact circularity and surface roughness in honing. The movement to make a importing tool in korea is getting up due to the high cost.
복합 페롭스카이트 화합물을 고용한 PZT-PNN계 세라믹스의 전계유기압전변위특성
류지구,김강언,정수태 釜山工業大學校 1994 論文集 Vol.36 No.-
The piezoelectric properties and the electric field dependences of a electric field induced strain constant(D??(E)) are investigated as a variation of PE(PE=PFN, PFW, PZN or PMN) in 0.5[Pb(Ti??Zr??)O₃]-0.45PNN-0.05PE system ceramics. The Curie temperature of samples with PFN or PZN were same, ie, 157[℃] which were higher than those of other samples, and piezoelectric strain constant[d??] of samples with PMN or PZN were more than 320×10??[m/V]. Electric field dependences of D??(E) increased as the coercive field decreased, the order of electric field dependence of D??(E) is PMN > PZN > PFN > PFW. D??(E=0) of samples with PMN or PZN were more than about 520×10??[m/V]. D??(E) of all the samples with excepted PMN increased linearly up to 3[kV/cm]. But D??(E) of sample with PMN rapidly increased at about 2.2[kV/cm], since the sample had the lowest coercive field(3.493[kV/cm]) in the other samples. The sample with PZN showed a higher Curie temperature and D??(E) and a good linearty of D??(E), which are considered to be well suited for a piezoelectric actuator materials.