• Electrical & Electronic Materials
• /
• v.8 no.1
• /
• pp.48-55
• /
• 1995

A surface acoustic wave (SAW) sensor for the detection of odorants has been constructed by depositing various phospholipids and fatty acids onto the surface of the SAW device. The characteristics of a SAW device operating at 310 MHz deposited with silicon monoxide were analyzed. Menthone, amylacetate, acetoin, and other organic gases show different affinities to the coated lipids. An explanation is given for different odorant affinities based on the monolayer properties of phospholipids. The identification of odorants depending on the tkpe of lipid used for coating is discussed in terms of the similarity of their normalized resonant frequency shift patterns. Using a number of different lipid-coated SAW devices, odorants can be identified by a computerized pattern recognition algorithm.

• The Journal of Korean Society of Virology
• /
• v.26 no.1
• /
• pp.107-114
• /
• 1996

본 연구는 인간면역결핍바이러스의 입자를 비이온성 계면활성제로 처리할 때 바이러스 입자구조에서 분리되어 방출되는 바이러스 구조단백질들의 분포를 sucrose gradient로 분석하여, 바이러스 입자를 구성하는 바이러스 구조단백질과 바이러스입자의 생물리학적 특성을 연구하였다. 바이러스입자들을 0.16% NP40 (Nonidet P-40)으로 처리할 때, 바이러스 capsid 단백질과 바이러스 막 단백질 (membrance protein)들은 다른 바이러스 구성성분들과 잘 분리되었다. 계면활성제처리에서 방출되지 않은 구성 성분들은 matrix 단백질, nucleocapsid 단백질, reverse transcriptase, integrase 및 바이러스 RNA genome로써, 이들은 subviral 구조를 형성한다. 이러한 결과는 상대적으로 다른 바이러스들의 capsid 단백질과 면역 결핍 바이러스의 capsid 단백질 (p24)를 비교할 때, 면역결핍바이러스의 capsid 단백질은 바이러스핵을 형성할 때, capsid 단백질 사이의 결합력이 매우 약한 것으로 추정된다. 또한 바이러스 조절단백질의 하나인 vpr 단백질을 함유하는 바이러스입자를 NP40 처리하여 분석하였을 때, vpr 단백질은 subviral 구조에 존재하는 것으로 나타났다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.04a
• /
• pp.549-554
• /
• 2000

In this study, using linear and nonlinear deformation theories and by closed-form analysis and finite difference energy methods, respectively, various buckling load factors are obtained for stiffened laminated composite cylindrical panels with rectangular type longitudinal stiffeners and various longitudinal length to radius ratios, which are made from Carbon/Epoxy USN150 prepreg and are simply-supported on four edges under uniaxial compression, and then for them, buckling behavior design analyses are carried out by the nonlinear search optimizer, ADS

• Microbiology and Biotechnology Letters
• /
• v.21 no.5
• /
• pp.414-420
• /
• 1993

Escherichia coli mrdAts and mrdBts mutants forming spherical cells at 42C, were employed to investigate the possible role of both inner and outer membrance structures in the determination of cell shape of gram-negative cells. Spherical cells, but not rod-shaped wild types, were specifically killed by anionic detergents, such as sarkosyl, sodium dodecylsulfate and sodium deoxycholate. From the spherical intact cells grown overnight at 42C, much more proteins were released by sakosyl.

• Journal of Life Science
• /
• v.6 no.3
• /
• pp.165-170
• /
• 1996

The action of phospholipid on the rhodotorucine A(RH.A) acceptance by heterbasidiomyceteous yeast Rhodosporidium toruloides mating type a cells and the effect of medium composition during sexual differentiation were investigated. Activation of trigger peptidase(TPase)was very sensitive to the originated phospholipid from R. toruloides and was more sensitive to phospholipid liposome made up of phospholipi. Phospholopod present on the membrance of mating type a cells consists of phospatidylglycerol(PG), phosphatidylethanolamine(PE), phospatidylcholine(PC), phospatidylinositol(PI), and phosphatidylserine(PS) of 12.9, suprisingly 45.4, 11.0, and 13.9%, respectively. As the result of using C-1 and N-1 mediums which limited C and N sources capable of inhibiting the synthesis of phospholipid, it resulted inhibiting sexual dlfferentiation and production of Rh.A from mating type Acells.

• The Transactions of the Korean Institute of Electrical Engineers
• /
• v.40 no.9
• /
• pp.913-919
• /
• 1991

For an elementary study of the molecular electronic devices, in this study, N-alkylpyridinium(TCNQ) (1:1) and (1:2) complexed were synthesized. These complexes were verified by the UV, IR and the elemental analysis. Deposition of the LB films were verified by the reciprocal capacitance, UV absorbance and decresement area of Langmuir fims as functions of number of layers. The internal voltage of LB membrane devices fabricated with Y-type resides in 100-300mV. Finally, it seemed that self-polarization of LB membrance generates internal voltage.

• The Korean Journal of Ceramics
• /
• v.1 no.4
• /
• pp.219-223
• /
• 1995

Ceramic membranes of the supported $TiO_2-CeO_2$ were prepared by dip-coating method on an $\alpha-Al_2O_3$ porous substrate. The mean pore diameter of an alumina support was 0.125 um. The mean particle diameter of $TiO_2-CeO_2$ top layer varied with firing temperature and ranged from 20 to 85 nm. The thermal stability of the composite membranes was studied from their surface microstructure after calcination at $600-900^{\circ}C$. The supported $TiO_2-CeO_2$ composite membranes exhibited much higher heat resistance than the $TiO_2$ membrane.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.11 no.8
• /
• pp.628-636
• /
• 1998

LB layers L-$\alpha$-DLPC deposited by LB method were deposited onto n-type silicon wafer as Z-type film. Films made up of 8, 16 layers of lipid with long alkyl chain and the thickness of monolayer and multiayers was determined by ellipsometry. Ut was deposited Ag and Al onto LB layers and silicon wafer for electrode and small electrode exhibit high capacitiance and low lekage current. The C-V curves of the MLS capacitor shows very high saturation value of capacitance. And cross-sectional SEM image of MLD capacitor indicated the presence of pore with Al electrode and we found that the Ag is good for electrode metal.

• The Transactions of the Korean Institute of Electrical Engineers C
• /
• v.50 no.6
• /
• pp.307-313
• /
• 2001

A micro syringe which can be attached to the end of a micro intravascular endoscope for drug injection is fabricated and its characteristic is tested. The syringe consists of a drug chamber and an actuator chamber which are separated by a silicone rubber membrane. The drug chamber is filled with liquid drug by the membrance actuation caused by the vaporization and condensation of the working liquid in the actuator chamber. The liquid drug is ejected by the electrolysis of the working liquid. The membrane deflection by each actuation method has been measured. The liquid ejection image has been captured during the electrolysis of the electrolyte. Also, the successful operation of the micro syringe under the normal blood pressure was verified.

• Journal of the Korean Society of Safety
• /
• v.3 no.2
• /
• pp.25-34
• /
• 1988

The stress concentration phenomena due to the structural incontinuty are studied by finite element method. In this study, a circular cylinder is treated. Under the axial load, the membrance action is dominate and the 24 D.O.F. cylindrical membrane finite element is used. The assembly of this element can successfully represent the original structure geometrically. The internal displacement function is such organized that the inter element compatibility condition is fully satisfied. In this study, the stress concentration factors due to the presence of a hole on the cylinder wall are obtained, and the factors versus the location of the hole is computed and plotted. It is found that the hole effect on the stress concentration disappears beyond the neighboring region of the hole size form the edge of the hole. Those results are useful for practical design in determining the region where the re-inforcing is necessary.