• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 춘계학술대회 논문집
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• pp.40-40
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• 2010

CdSe nanocrystals (NCs) have been decorated on singlewalled carbon nanotubes (SWCNTs) by combining a method of chemically modified substrate along with gate-bias control. CdSe/ZnS core/shell quantum dots were negatively charged by adding mercaptoacetic acid (MAA). The silicon oxide substrate was decorated by octadecyltrichlorosilane (OTS) and converted to hydrophobic surface. The negatively charged CdSe NCs were adsorbed on the SWCNT surface by applying the negative gate bias. The selective adsorption of CdSe quantum dots on SWCNTs was confirmed by confocal laser scanning microscope. The measured photocurrent clearly demonstrates that CdSe NCs decorated SWCNT can be used for photodetector and solar cell that are operable over a wide range of wavelengths.

• 한국기록관리학회지
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• 제9권1호
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• pp.5-32
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• 2009

이 논문은 병무청의 업무수행 과정에서 산출된 행정기록물을 보완할 수 있는 역사적, 문화적, 정보적 가치를 지닌 매뉴스크립트 수집정책을 수립하는 데 목적이 있다. 연구의 대상이 되는 병무행정 매뉴스크립트의 수집은 병무청 개청 40주년 기념사업의 일환으로 병무행정기록관 설치에 그 목적이 있으며 병무행정기록관 설치사업과 연계하여 수집정책을 수립하고자 한다. 이를 위하여 이 연구에서는 사명문 개발, 수집범주 및 대상, 수집방법 및 절차를 제안하였다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2023년도 제68차 하계학술대회논문집 31권2호
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• pp.195-196
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• 2023

코로나19로 인한 비대면 사회의 발전으로 일반인들의 IT이용이 증가하였고, 우크라이나 전쟁이 장기화됨에 따라 주요 기반시설 및 글로벌 기업을 대상으로 대규모 사이버 공격 시도가 증가할 것으로 전망된다. 사이버 공격에는 대부분 악성코드가 활용이 된다. 본 논문에서는 2022년 및 2023년 1분기 중 사이버공격에 많이 활용된 악성코드들의 특징과 동향을 파악한다.

• 디지털융복합연구
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• 제20권5호
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• pp.463-476
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• 2022

과거 산업화 이후 자동차 산업은 내연기관 중심의 지속적인 성장을 하였으나, 최근 4차 산업혁명으로 큰 변화를 맞이하고 있다. 대다수의 기업들이 전기 자동차, 자율주행으로의 전환을 준비하고 있으며, 현시점에서 국내와 국외의 미래 자동차 연구동향을 비교 분석할 필요가 있다. 이에 본 연구에서는 미래 자동차 트렌드를 대표하는 CASE(Connectivity, Autonomous, Sharing, Electrification)와 관련된 키워드가 포함된 국내 4,002건, 국외 68,372건 논문을 수집하여 LDA 알고리즘 기반의 토픽모델링을 수행하였으며, 국내외 미래 자동차 연구동향을 비교 분석하여 정책적 시사점을 제시하였다. 분석 결과 국내의 경우 교통 인프라, 도시 내 교통효율, 교통정책 등과 같은 거시적인 측면에서의 연구가 주를 이루는 것으로 나타났으며, 국외는 객체인식, 사물인터넷, 전기자동차 소음 등의 차량기술과 관련된 연구가 활성화되고 있음을 확인할 수 있었다. 이를 통해 국내 공유자동차 부문에 있어 MaaS(Mobility-as-a-Service)와 관련한 정부의 기술지원이 필요하고 교통수단별 데이터 개방 필요성 등에 대하여 제시하였고, 이러한 분석결과는 미래 자동차 산업을 위한 기초자료로 활용될 수 있을 것으로 판단된다.

• 한국재료학회지
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• 제19권1호
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• pp.44-49
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• 2009

Conjugated nanocrystals using CdSe/ZnS core/shell nanocrystal quantum dots modified by organic linkers and glucose oxidase (GOx) were prepared for use as biosensors. The trioctylphophine oxide (TOPO)-capped QDs were first modified to give them water-solubility by terminal carboxyl groups that were bonded to the amino groups of GOx through an EDC/NHS coupling reaction. As the glucose concentration increased, the photoluminescence intensity was enhanced linearly due to the electron transfer during the enzymatic reaction. The UV-visible spectra of the as-prepared QDs are identical to that of QDs-MAA. This shows that these QDs do not become agglomerated during ligand exchanges. A photoluminescence (PL) spectroscopic study showed that the PL intensity of the QDs-GOx bioconjugates was increased in the presence of glucose. These glucose sensors showed linearity up to approximately 15 mM and became gradually saturated above 15 mM because the excess glucose did not affect the enzymatic oxidation reaction past that amount. These biosensors show highly sensitive variation in terms of their photoluminescence depending on the glucose concentration.

• 대한전자공학회논문지SD
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• 제41권9호
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• pp.19-24
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• 2004

우리는 3층 구조의 레지스터와 이중 노광 방법을 이용하여 유전체 지지대를 사용하지 않은 새로운 방법으로 게이트 길이가 70 nm인 T-게이트를 갖는 InGaAs/InAlAs/GaAs metamorphic HEMT 제작 하였다. 게이트 길이가 70 nm이고 게이트 단위폭이 70 ㎛인 2개의 게이트를 가지고 있는 MHEMT는 최대 포화 전류밀도가 최대 포화 전류밀도가 228.6 mA/mm, 상호전달 컨덕턴스는 645 mS/mm, 전류이득차단주파수가 255 GHz인 특성을 보였다.

• 한국응용과학기술학회지
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• 제25권4호
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• pp.525-532
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• 2008

To prepare a solution type acrylic pressure-sensitive adhesive, quarter polymers were synthesized from butyl acrylate(BA), 2-ethylhexylacrylate(2-EHA) as a base monomer, methyl methacrylate(MMA) as a comonomer, each of methacrylic acid(MAA), acrylic acid(AA) as a functional monomer. Acrylic solution type pressure-sensitive adhesives(PSA's) of isocyanate derivative crosslinking PSA's were prepared by crosslinking of BEMM, BEMA with toluene-2,4-diisocyanate. The structure of adhesive was identified by FT-IR. The viscosity was measured by using Brookfield DV-III and molecular weight was measured by using gel permeation chromatography. The physical properties of polyethylene film coated with BEMMT, BEMAT were measured as a function of the concentration. As the result, BEMMT(0.6, 0.8), BEMAT(0.6) showed peel adhesion of $160{\sim}180\;g_f$/25 mm width and shear adhesion of more than 24 hours, and tackiness of $4/32{\sim}6/32$ which was relevant to commercial usage.

• Transactions on Electrical and Electronic Materials
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• 제9권1호
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• pp.38-43
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• 2008

Using an arterial pressure-volume (APV) model, we performed an analysis of the conventional blood pressure estimation method using an oscillometric sphygmomanometer with computer simulation. Traditionally, the maximum amplitude algorithm (MAA) has been applied to the oscillation waveforms of the APV model to obtain the mean arterial pressure and the characteristic ratio. The estimation of mean arterial pressure and characteristic ratio was significantly affected by the shape of the blood pressure waveforms and the cutoff frequency of high-pass filter (HPF) circuitry. Experimental errors result from these effects when estimating blood pressure. To determine an algorithm independent of the influence of waveform shapes and parameters of HPF, the volume oscillation of the APV model and the phase shift of the oscillation with fast Fourier transform (FFT) were tested while increasing the cuff pressure from 1 mmHg to 200 mmHg (1 mmHg/s). The phase shift between ranges of volume oscillation was then only observed between the systolic and the diastolic blood pressures. The same results were obtained from simulations performed on two different arterial blood pressure waveforms and one hyperthermia waveform.

• Earthquakes and Structures
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• 제23권1호
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• pp.87-100
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• 2022

Limiting the displacement of seismic isolators causes a pounding phenomenon under severe earthquakes. Therefore, the ASCE 7-16 has provided minimum criteria for the design of the isolated building. In this research the seismic response of isolated buildings by Triple Friction Pendulum Isolator (TFPI) under the impact, expected, and unexpected mass eccentricity was evaluated. Also, the effect of different design parameters on the seismic behavior of structural and nonstructural elements was found. For this, a special steel moment frame structure with a surrounding moat wall was designed according to the criteria, by considering different response modification coefficients (RI), and 20% mass eccentricity in one direction. Then, different values of these parameters and the damping of the base isolation were evaluated. The results show that the structural elements have acceptable behavior after impact, but the nonstructural components are placed in a moderate damage range after impact and the used improved methods could not ameliorate the level of damage. The reduction in the RI and the enhancement of the isolator's damping are beneficial up to a certain point for improving the seismic response after impact. The moat wall reduces torque and maximum absolute acceleration (MAA) due to unexpected enhancement of mass eccentricity. However, drifts of some stories increase. Also, the difference between the response of story drift by expected and unexpected mass eccentricity is less. This indicates that the minimum requirement displacement according to ASCE 7-16 criteria lead to acceptable results under the unexpected enhancement of mass eccentricity.

• 대한핵의학회지
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• 제20권2호
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• pp.73-78
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• 1986

Of 18 patients with Takayasu's arteritis who underwent $^{99m}Tc-MAA$ (macroaggregated albumin) perfusion luing scanning, 9 (50%) showed perfusion defects. Chest X-rays of them were nonspecific. One patient underwent $^{99m}Tc-DTPA$ radio aerosol inhalation lung scanning simultaneously, which revealed normal. So routine screening radioisotope perfusion lung scanning is helpful to evaluate pulmonary arterial involnmement in Takayasu's arteritis patients. And Takayasu's arteritis should be included in differential diagnosis of pulmonary embolism.