• 한국전자파학회논문지
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• 제18권1호
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• pp.76-81
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• 2007

본 논문에서는 PC 키보드의 누설 전자파에 의한 정보 누설 취약성을 분석하였다. 먼저 키보드 프로토콜과 하드웨어 구조를 살펴보고, 키보드에서 PC 본체로 전송되는 데이터 신호와 본체 전원선에 누설된 신호 사이의 상호 관계를 분석함으로써 키보드 전도성 방사의 원인을 파악하였다. 또한 키보드 누설 전자파의 크기를 계산하고 CTSPR 22 규격의 허용 레벨과 비교하였다. 간단한 실험을 통하여 PC본체 전원선의 신호를 분석하여 키보드 글쇠 내용을 얻을 수 있음을 보임으로써, PC 사용자의 중요 정보가 누설될 수 있음을 확인하였다.

• Transactions on Electrical and Electronic Materials
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• 제15권1호
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• pp.41-44
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• 2014

Emission properties of the organic light-emitting diodes were investigated with the use of a hole-injection layer of copper(II)-phthalocyanine (CuPc). The manufactured device structure is indium-tin-oxide (ITO) (180 nm)/CuPc (0~50 nm)/N,N'-Bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) (40 nm)/tris-(8-hydroxyquinoline) aluminum (III) ($Alq_3$) (60 nm)/Al(100 nm). We investigated the luminescence properties of $Alq_3$ which is affected by the CuPc hole-injection layer. Also, we studied the influence of light-emission properties in the structure of an ITO/CuPc/TPD/$Alq_3$/Al device depending on the several thicknesses of CuPc (0~50 nm) layer. As a result, it was found that the hole injection occurs smoothly in the device with 20 nm thick CuPc layer, and the properties become significantly worse in the device with a CuPc layer thickness higher than 40 nm. We studied the topography and external quantum efficiency depending on the layer thickness of CuPc. Also, we analyzed the electroluminescent characteristics in the low and high-voltage range.

• 한국결정성장학회지
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• 제9권6호
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• pp.553-557
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• 1999

MOCVD로 성장된 $A1_x$$Ga_{1-x}$N/GaN 박막의 광학적 특성을 이해하기 위하여 실온에서 광발광(PL), 광전류)PC), 광단속에 의한 광권도도(PPC) 측정하였다. PL과 PC로 결정된 $A1_x$$Ga_{1-x}$N/GaN 박막의 광학적 에너지 간격은 3.7eV 이었다. PC측정 시 빛을 시료의 위쪽에서 조사시켰을 때에는 3.70, 3.40eV의 peak와 2.2eV 근방에서 broad한 peak가 관측되었다. 그러나 기판 쪽에서 빛을 조사시켰을 때의 PC 스펙트럼은 2.2eV 근방에서 broad한 peak와 3.43eV peak 만을 볼 수 있었다. PPC실험에서 관측된 photocurrent quenching과 비정상적인 PPC현상은 GaN 띠간격내에 형성된 전위나 vacancy 등의 결정결함 준위내에 전자들이 포획되고 오랫동안 포화되어 있다가 다시 방전되는 현상으로 보인다.

• Natural Product Sciences
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• 제10권3호
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• pp.124-128
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• 2004

Previously, $(1R,9S)-{\beta}-Hydrastine$ hydrochloride has been found to lower dopamine content in PC12 cells (Kim et al., 20001). In this study, the effects of $(1R,9S)-{\beta}-Hydrastine$ hydrochloride on L-DOPA-induced cytotoxicity in PC12 cells were investigated. Treatment with $(1R,9S)-{\beta}-Hydrastine$ hydrochloride at concentrations higher than $500\;{\mu}M$ caused cytotoxicity in PC12 cells. In addition, $(1R,9S)-{\beta}-Hydrastine$ hydrochloride at non-cytotoxic or cytotoxic concentrations significantly enhanced L-DOPA-induced cytotoxicity (L-DOPA concentration, $50\;{\mu}M$). Treatment of PC12 cells with $750\;{\mu}M$ $-1R,9S)-{\beta}-Hydrastine$ hydrochloride and $50\;{\mu}M$ L-DOPA, alone or in combination, also induced cell death via a mechanism which exhibited morphological and biochemical characteristics of apoptosis, including chromatin condensation and membrane blebbing. Exposure of PC12 cells to $(1R,9S)-{\beta}-Hydrastine$ hydrochloride, L-DOPA and $(1R,9S)-{\beta}-Hydrastine$ hydrochloride plus L-DOPA for 48 h resulted in a marked increase in the cell loss and percentage of apoptotic cells compared with exposure for 24 h. These data indicate that $(1R,9S)-{\beta}-Hydrastine$hydrochloride at higher concentration ranges aggravates L-DOPA-induced neurotoxicity cytotoxicity in PC12 cells. Therefore, it is proposed that the long-term L-DOPA therapeutic patients with $(1R,9S)-{\beta}-Hydrastine$ hydrochloride could be checked for the adverse symptoms.

• Bulletin of the Korean Chemical Society
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• 제31권8호
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• pp.2247-2254
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• 2010

The surface structures of copper phthalocyanine (CuPc) thin films deposited on sulphur-passivated and plane perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA)-covered InAs(100) surfaces have been studied by low energy electron diffraction (LEED) and van der Waals (vdW) intermolecular interaction energy calculations. The annealing to $300^{\circ}C$ and $450^{\circ}C$ of $(NH_4)_2S_x$-treated InAs(100) substrates produces a ($1{\times}1$) and ($2{\times}1$) S-passivated surface respectively. The CuPc deposition onto the PTCDA-covered InAs(100) surface leads to a ring-like diffraction pattern, indicating that the 2D ordered overlayer exists and the structure is dominantly determined by the intermolecular interactions rather than substrate-molecule interactions. However, no ordered LEED patterns were observed for the CuPc on S-passivated InAs(100) surface. The intermolecular interaction energy calculations have been carried out to rationalise this structural difference. In the case of CuPc unit cells on PTCDA layer, the planar layered CuPc structure is more stable than the $\alpha$-herringbone structure, consistent with the experimental LEED results. For CuPc unit cells on a S-($1{\times}1$) layer, however, the $\alpha$-herringbone structure is more stable than the planar layered structure, consistent with the absence of diffraction pattern. The results show that the lattice structure during the initial stages of thin film growth is influenced strongly by the intermolecular interactions at the interface.

• 대한환경공학회지
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• 제22권10호
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• pp.1809-1816
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• 2000

본 연구는 상압유통식 반응장치를 이용하여 석유화학공단에서 주로 발생되는 휘발성 유기화합물(volatile organic compound: VOC) 인 methanol의 연소에 대한 다양한 금속-프탈로시아닌의 촉매활성에 관하여 연구하였다. Co-PC의 촉매활성은 air+methanol의 혼합물을 이용하여 전처리한 경우가 air만으로 전처리한 경우보다 더 높았으며, 금속-PC의 촉매활성은 metal free-PC < Zn-PC < Fe-PC < Cu($\alpha$)-PC < Co-PC의 순서 였다. TG/DTA 분석 결과, 금속-PC 의 열분해 용이 성은 metal free-PC < Zn-PC < Cu($\alpha$)-PC < Co-PC < Fe-PC의 순서로 나타었으며, 금속과 프탈로시아닌의 결합특성에 따른 차이로 판단된다. XRD 및 EA 분석결과, 전처리한 후의 Zn-PCS와 metal free-PC는 원래의 결정구조가 거의 유지되었지만, Co-PC, Cu($\alpha$)PC 및 Fe-PC는 원래의 결정구조가 파괴되는 것으로 나타났다. 전처리한 후의 Co-PC는 금속산화물인 $Co_3O_4$의 형태로 존재하였으며, Co-PC의 촉매활성이 가장 우수하였다. Co-PC 상에서 methanol의 촉매연소는 반응물의 농도가 높거나 접촉시간(W/F)이 짧을 경우, 중간생성물로서 HCHO 및 $HCOOCH_3$가 관찰되었다.

• 콘크리트학회논문집
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• 제28권2호
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• pp.129-139
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• 2016

대형 PC기둥의 양중부하를 줄이고 접합부의 구조일체성을 개선하기 위한 대안으로서, 중공 PC기둥이 사용될 수 있다. 본 연구에서는 PC부의 생산성과 구조일체성을 개선한 새로운 중공 PC기둥을 개발하였다. PC부를 제작하기 위하여 구조용 골형플레이트를 내부영구거푸집과 수평 관통철근을 사용하였다. 제안된 PC기둥의 내진성능을 검증하기 위하여, 1/2 스케일의 기둥 실험체 4개에 대하여 일정 축력에서 반복 횡가력실험을 수행하였다. 실험 변수로는 횡철근 간격, 강섬유 사용여부, 그리고 PC부의 두께가 고려되었다. 실험 결과, 제안된 PC기둥은 외곽 PC부의 취성적인 파괴 없이 우수한 하중재하능력과 변형능력을 보이는 것으로 나타났다. PC부에 횡철근을 촘촘히 배근하거나 강섬유를 사용할 경우, PC 콘크리트의 탈락을 제한하여 변형능력을 증가시킬 수 있었다.

• 정보학연구
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• 제4권1호
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• pp.9-22
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• 2001

본 논문에서는 웹브라우저를 이용하여 로봇을 원격 제어한다. 4대의 독립된 PC를 사용하여 자각의 기능을 분리하고 상호 연동하는 구조로 PC를 연결하였다. 조작자가 시간과 장소에 제약받지 않고 웹브라우저를 이용하여 제어값을 입력하면 제어값은 웹 서버를 거쳐 데이터베이스에 저장된다. 로봇과 연결된 PC는 데이터베이스에서 1ms 간격으로 제어값을 입력받아 제어값의 변화가 있을 경우만 제어값의 변화량으로 로봇이 동작한다. 스텝모터를 이용하여 간단한 로봇을 제작하고 이를 웹 브라우저를 이용하여 실제 동작시킨다. 조작자가 원하는 제어값이 최종 수신단의 로봇에 제대로 전달되어 동작하는지 확인하고 웹브라우저를 이용한 로봇제어의 가능성을 확인하였다

• 대한화장품학회지
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• 제27권1호
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• pp.3-15
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• 2001

The bilayer forming ability of pseudo-ceramide PC104 in octanoic acid/water/n-octyl $\beta$-D-glucoside mixtures was investigated through the phase diagram. Because of its low solubility in water and of its crystallization, pseudoceramide PC104 was dissolved in octanoic acid, which is nontoxic additive for foods and cosmetics. The mixtures formed four different phases (L1, L2, LC and two phases). Depending on the concentration of PC104 in octanoic acid, the region of each phase was extended or contracted. On the contrary to the region of L2, regions of lamellar phase and L1 phase were expanded. The bilayer-forming ability of PC104 was explained on the basis of concentration of PC104 at interface and interaction between PC104 and octanoic acid. From FT-IR results, it was found that the interactions of PC104’s polar head group with octanoic acid increased as the amount of PC104 in octanoic acid increased. Also emulsion size and size distribution have been studied depending upon the emulsification path. droplets of emulsion prepared from lamellar phase were smaller and more homogeneous compared to those of emulsions formed from L2 phase.

• Child Health Nursing Research
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• 제7권1호
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• pp.62-73
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• 2001

The purpose of the study is to identify the differences about knowledge and attitude between the subjects exposed to pc pornography and the control group not exposed to pc pornography. The study was executed from July 12 through July 16. The subjects were 423 middle school boys. The comparison points were their ethical sexual knowledges and sexual attitudes. The collected data was analysed by SPSS WIN(including multiplicand, percentage, χ²-test, revised Fisher and t-test). The results of their study were as follows ; 1. The pc-related characteristics of the subjects. The subjects exposed pc pornography showed 51.8％ rate of exposure to printed pornography. The control group showed the rate of 26.4％. The former group owned their pc(81.5％), however, the latter group showed 66.7％. The former group set their pc sets in their study rooms(66.1％) however, the latter group installed those in their study rooms(73.6％). The former group experienced internet pc communications(62.5％),however, the latter group showed 40.2％. The former group made use of their pc sets in recreation(entertainment) programs(77.0％), however, the latter group showed the rate of 67.8％. The former group showed that their school performance levelled up after their pc manipulation(80.0％), however, the latter group showed the rate of 86.2％. The former group replied that their pc manipulation contributed to their friendship(50.3％), however, the latter group showed the higher rate of 74.7％. The both groups replied that their family dialogs and contacts rather reduced (78.9％ and 78.2％ respectively). The both groups revealed that they reduced the TV watching the rate 76.5％ and 48.3％ respectively. The differences between two groups were surveyed in the level of 95％ significance and the items such as 'contacts to printed pornography, pc possession or none, pc use rate, friendship occasions and the reduced time of TV watching' showed the significant differences. 2. The differences of two groups' sexual knowledges. As to the sexual knowledges, the both groups showed 41.1 and 34.1 points against 100 points respectively. The statistical differences were significant(t=2.72, p=.007). The 5 items among 17 showed the significant differences between two groups. 'The concept of masturbation' was χ²=5.033, p=.025. 'The prejudice to masturbation' showed χ²=9.902, p=.002 'The difference between female and male as to sexual excitement' showed χ²=7.985, p=.005. 'The positiveness of masturbation' showed χ²=10.205, p=.001. 'The differences between two sexes as to sexual impulse and sexual desire' showed χ²=8.463, p=.004. In conclusion, The former group showed the higher knowledges than the latter group. 3. The differences of two groups' sexual attitudes. The 4 items such as 'the curiosity to the other sex'(t=2.22, p=.027), 'the attention to pornography'(t=3.39, p=.001), 'the permission to pre-marriage intercourse'(t=2.15, p=.032) and 'the preference to the female body exposure'(t=2.67, p=.008) showed the differences between two groups as to sexual attitudes.