• Journal of Periodontal and Implant Science
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• 제38권4호
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• pp.691-698
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• 2008

Purpose: Periodontal pathogens can invade the host tissue. Morphologic studies have revealed bacteria within the pocket epithelium, gingival connective tissues, alveolar bone, and oral epithelium. The objective of this study was to visualize and evaluate presence of Porphyromonas gingivalis and Tannerella forsythia in crevicular epithelial cells of periodontally healthy subjects and chronic periodontitis patients. Materials and Methods: A total of 666 crevicular epithelial cells in the samples obtained from 27 chronic periodontitis patients and 9 healthy volunteers were examined. Specific probes for P. gingivalis and T. forsythia and a universal probe for detection of all eubacteria targeting 168 rRNA for fluorescence in situ hybridization was used in conjunction with confocal laser scanning microscopy. Results: 98.99% of sulcular epithelial cells from healthy volunteers and 84.40% of pocket epithelial cells from periodontitis patients were found to harbor bacteria. P. gingivalis and T. forsythia were discovered more often in crevicular epithelial cells from periodontitis patients. Conclusion: P. gingivalis and T. forsythia can invade crevicular epithelial cells and intracellular bacteria may act as a source of bacteria for persistent infection.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 추계학술대회 논문집
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• pp.126-130
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• 1995

$CdS_{1-x}Te_{1-x}$ polycrystalline thin films were fabricated from CdS and CdTe powder by co-evaporation method at $10^{-6}$ Torr. The Optimum evaporation condition was substrate temperature $T_{s}$=$150^{\circ}C$, evaporation time t=30 min. XRD spectrums indicated that the crystal structure chanced from zinc blonde (x$\leq$0.22) to wurtzite (x$\geq$0.96) through mixed structure (0.22$\leq$0.74) as composition value x increase to CdS. Conductive type was n-type by hot point probe method. van der Pauw method was not applicable for x<0,5 due to high hall voltages, Electrical resistivity and Hall carrier mobility were decreased as x increase, while Hall carrier concentration was increased. The optical bandgap of $CdS_{1-x}Te_{1-x}$ polycrystalline thin films measure d at R.T. had quardratic form and the bowing parameter was fitted as 1.98eV for theoretical value of 2.0eV. I-V characteristics of In/CdTe/$CdS_{x}Te_{1-x}$Au Schottky diodes showed that CdS-rich one had better forward characteristics than CdTe-rich one.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 하계종합학술대회 논문집
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• pp.287-290
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• 1989

Single-phase $YBa_2Cu_3O_{j-g}$ (YBC) ceramic samples were annealed at $700^{\circ}C$ under a flowing $O_2$ atmosphere for 0, 18, 36, 54 and 72. hours after sintering. The resistivities(p) and the critical current densities($J_c$) of the samples were measured in a temperature range 77 to 300 K by a four probe method, using silver paint contacts. The variations of the electrical properties with annealing time are explained in terms of flux pinning, percolation probability and randomness, and alignment of grains and twins.The anomalous increases in $J_c$ and $T_c$ observed in sample annealed for a relatively long time possibly due to alignment of grains and twins, may imply the occurrence of superconducting glass state in high-$T_c$ superconducting ceramic.

• 한국식품과학회지
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• 제26권1호
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• pp.1-5
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• 1994

쌀전분의 열전도도를 probe method로 측정하였다. 수분함량이 0에서 28.2%로 증가함에 따라 열전도는 약 $0.065{\sim}0.09W/mK$에서 $0.13{\sim}0.23W/mK$로 약 $2{\sim}2.5$배의 큰 증가를 보였다. 밀도가 일정할 때 온도가 $25^{\circ}C$에서 $70^{\circ}C$로 증가함에 따른 열전도는 수분함량이 증가할수록 뚜렷하게 증가하였다. DSC의 측정결과 수분함량 7.2% 이하인 경우는 endothermic peak가 전혀 보이지 않았으며, 그 이상의 수분함량$(7.2{\sim}33.6%)$에서도 매우 완만한 peak를 보여 주었다. 따라서 열전도도에 대한 수분함량-온도의 교호작용은 전분의 호화에 의한 간접적인 영향이라기 보다는 물의 열전도도의 온도의존성에 기인하는 것으로 추측된다. 쌀전분의 열전도도(Ke)는 수분함량 $(M.C.,\;0{\sim}28.2%)$, 충진밀도$(P_{b},\;650{\sim}800\;kg/m^{3})$ 및 온도$(T,\;25{\sim}70^{\circ}C)$와 Ke=-0.111+0.000203 T+0.00173 M.C.+0.000247 $P_{b}+0.000035$ M.C. T의 관계식을 얻어졌다.

• Preventive Nutrition and Food Science
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• 제17권4호
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• pp.274-279
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• 2012

For the quantitative analysis of genetically modified (GM) maize in processed foods, primer sets and probes based on the 35S promoter (p35S), nopaline synthase terminator (tNOS), p35S-hsp70 intron, and zSSIIb gene encoding starch synthase II for intrinsic control were designed. Polymerase chain reaction (PCR) products (80~101 bp) were specifically amplified and the primer sets targeting the smaller regions (80 or 81 bp) were more sensitive than those targeting the larger regions (94 or 101 bp). Particularly, the primer set 35F1-R1 for p35S targeting 81 bp of sequence was even more sensitive than that targeting 101 bp of sequence by a 3-log scale. The target DNA fragments were also specifically amplified from all GM labeled food samples except for one item we tested when 35F1-R1 primer set was applied. A reference plasmid pGMmaize (3 kb) including the smaller PCR products for p35S, tNOS, p35S-hsp70 intron, and the zSSIIb gene was constructed for real-time PCR (RT-PCR). The linearity of standard curves was confirmed by using diluents ranging from $2{\times}10^1{\sim}10^5$ copies of pGMmaize and the $R^2$ values ranged from 0.999~1.000. In the RT-PCR, the detection limit using the novel primer/probe sets was 5 pg of genomic DNA from MON810 line indicating that the primer sets targeting the smaller regions (80 or 81 bp) could be used for highly sensitive detection of foreign DNA fragments from GM maize in processed foods.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.138-138
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• 2009

Al, Ga and In doped ZnO thin film were prepared by faing targets sputtering as a function of oxygen gas contents at R.T. Base pressure was $2{\times}10^{-6}torr$, and working pressure was 1mTorr. The properties of thin films on the electrical and optical properties of the deposited films were investigated by using a four-point probe (Chang-min), a Hall Effect measurement (Ecopia) and an UV/VIS spectrometer (HP). The minimum resistivities of AZO, GZO and IZO thin film were $6.5{times}10^{-4}[{\Omega}-cm],5.5{\times}10^{-4}[{\Omega}-cm]$ and $4.29{\times}10^{-4}[{\Omega}-cm]$. The average transmittance of over 80% was seen in the visible range.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1478-1480
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• 2001

ZnO : Al transparent conductive thin films were prepared by facing targets sputtering system with a DC power supply which can deposit a high quality thin films and control deposition condition in all range of $O_2$ gas ratio using ZnO target containing 8 at% of Al. Sputtering was carried out at a substrate temperature of R T with a DC current of 0.6 A and $O_2$ flow rate of 0 $\sim$ 0.9. The characteristics of ZnO : Al thin films was investigated by $\alpha$-step, four point probe, X-ray diffraction and UV/VIS spectrometer.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 학술대회
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• pp.256-261
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• 2008

A CFD analysis of helicopter flowfield in forward flight is considered as non-trivial issue because of the complexity of vorticity-dominated flowfield. In this work, a study on the selection of the proper location for the installation of the Pitot probe is conducted using a CFD code which can deal with the interaction of rotor blade vortex and body. To describe the flow patterns for rotating rotor blades and body, the sliding mesh scheme is utilized. Pressure distributions and flow patterns are also analyzed to identify regions free from the interaction of body and wake induced from rotor blades.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년 추계학술대회논문집
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• pp.256-261
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• 2008

A CFD analysis of helicopter flowfield in forward flight is considered as non-trivial issue because of the complexity of vorticity-dominated flowfield. In this work, a study on the selection of the proper location for the installation of the Pitot probe is conducted using a CFD code which can deal with the interaction of rotor blade vortex and body. To describe the flow patterns for rotating rotor blades and body, the sliding mesh scheme is utilized. Pressure distributions and flow patterns are also analyzed to identify regions free from the interaction of body and wake induced from rotor blades.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.509-512
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• 2008

본 논문에서는 원전 증기발생기세관 진단을 위한 와전류탐상의 전자기 수치해석을 수행하였다. 전자기적 특성을 해석하기 위하여 맥스웰 방정식을 이용하여 지배방정식을 유도하였고, 3차원 전자기 유한요소 프로그램인 OPERA 3D를 이용하여 전자기 수치 해석을 수행하였다. 신호해석을 위해 사용된 프로브의 종류는 배열와전류프로브이며, FBH 결함의 신호를 해석하였다. 결함의 깊이는 세관 두께의 40[%], 60[%] 및 100[%]로 하였다. 시험주파수는 100[kHz], 300[kHz], 400[kHz]를 사용하였고, 각각의 결함 및 시험주파수에 대한 결과를 비교 분석하였다. 본 논문의 결과는 앞으로 배열와전류프로브를 이용하여 원전 증기발생기세관 진단을 할 경우 신호 해석에 도움이 될 것으로 사료된다.