• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2000년도 제18회 학술발표회 논문개요집
• /
• pp.162-162
• /
• 2000

We have studied magnetic properties of Co/Pt multilayered films which have attracted great interest as high-density magneto-optical (MO) recording media due to their good MO properties. For this study, [Pt(45 )/Co(35 )]$\times$8 films were deposited with a Pt buffer layer of 60 on Si(100) substrate by alternating electron-beam evaporation in a high vacuum and were ion beam mixed by using 80keV Ar+ at 25$0^{\circ}C$. Especially, an external magnetic field was added to help changing magnetic property during ion beam mixing (IBM). The intermixing of Co and Pt layers after IBM was confirmed with Rutherford Backscattering Spectroscopy (RBS) and Transmission Electron Microscopy (TEM). The MO property of the film was measured with magneto-optical Kerr spectrometer and the change of magnetic easy axis in the film plane was observed from Ker loop data. This anomalous result might be correlated with the change of atomic structure due to the intermixing effect.

• 한국건축시공학회지
• /
• 제22권3호
• /
• pp.229-237
• /
• 2022

초고성능 콘크리트(UHPC)는 낮은 물-바인더비(W/B), 고성능 감수제(SP), 혼화재 및 강섬유(Steel Fiber)의 혼입으로 일반 콘크리트보다 유동성, 강도 등에서 월등히 우수한 성능을 지닌 건설 재료이다. 본 연구에서는 UHPC를 활용하여 기존의 석재 패널을 대체할 수 있는 건축용 외장 패널을 제작하였다. 또한, UHPC의 W/B비 배합별 동일한 혼화제 투입량, 충전재의 혼입량, 소포제 및 강섬유 혼입 유무의 차이로 변수를 가지고 실험을 진행하였다. 평가 항목으로는 콘크리트 압축강도, 휨강도, 충격강도, 흡수율, 내동해성 등 물성 및 내구성 테스트를 진행하였다. 실험결과, 압축강도 최대 115.5MPa, 휨강도 20.3MPa을 확보하였으며 흡수율 1%이내, 충격강도 및 내동해성 평가는 규격 내 겉보기 관찰 결과 이상 없음 결과를 만족하였다.

• 반도체디스플레이기술학회지
• /
• 제21권1호
• /
• pp.148-154
• /
• 2022

As the 4th industrial age approaches, the demand for semiconductors is increasing enough to be used in all electronic devices. At the same time, semiconductor technology is also developing day by day, leading to ultraprecision and low power consumption. Semiconductors that keep getting smaller generate heat because the energy density increases, and the generated heat changes the shape of the semiconductor package, so it is important to manage. The temperature change is not only self-heating of the semiconductor package, but also heat generated by external damage. If the package is deformed, it is necessary to manage it because functional problems and performance degradation such as damage occur. The package burn in test in the post-process of semiconductor production is a process that tests the durability and function of the package in a high-temperature environment, and heat dissipation performance can be evaluated. In this paper, we intend to review a new material formulation that can improve the performance of the adapter, which is one of the parts of the test socket used in the burn-in test. It was confirmed what characteristics the basic base showed when polyamide, a high-molecular material, and alumina, which had high thermal conductivity, were mixed for each magnification. In this study, functional evaluation was also carried out by injecting an adapter, a part of the test socket, at the same time as the specimen was manufactured. Verification of stiffness such as tensile strength and flexural strength by mixing ratio, performance evaluation such as thermal conductivity, and manufacturing of a dummy device also confirmed warpage. As a result, it was confirmed that the thermal stability was excellent. Through this study, it is thought that it can be used as basic data for the development of materials for burn-in sockets in the future.

• 한국분말재료학회지
• /
• 제29권6호
• /
• pp.492-498
• /
• 2022

N-doped Na₂Ti₆O₁₃@TiO₂ (denoted as N-NTO@TiO₂) composites are successfully synthesized using a simple two-step process: 1) ball-milling of TiO₂ with Na₂CO₃ followed by heat treatment at 900℃; 2) mixing of the prepared Na₂Ti₆O₁₃ with titanium isopropoxide and calcining with urea at 500℃. The prepared composites are characterized using XRD, SEM, TEM, FTIR, and BET. The N-NTO@TiO₂ composites exhibit well-defined crystalline and anatase TiO₂ with exposed {101} facets on the external surface. Moreover, dopant N atoms are uniformly distributed over a relatively large area in the lattice of the composites. Under visible light irradiation, ~51% of the aqueous methylene blue is photodegraded by N-NTO@TiO₂ composites, which is higher than the values shown by other samples because of the coupling effects of the hybridization of NTO and TiO₂, N-doping, and presence of anatase TiO₂ with exposed {101} facets.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2022년도 가을 학술논문 발표대회
• /
• pp.241-242
• /
• 2022

Recently, related studies on the application of bacterial spores to self-healing concrete have been widely reported. Using the self-healing method of bacterial spores as a kind of pro-environment, the green method is very attractive, but because the living environment of bacterial spores is relatively harsh, it is necessary to have a way to separate the living environment of bacterial spores from the harsh external environment, And release bacterial spores when needed. Therefore, capsules are widely used in self-healing concrete. To enhance the self-healing effect, the capsules need to be evenly distributed in the concrete. Furthermore, we develop a CIP-based smart capsule with controllability. We determined the magnetic force of each capsule by mixing CIP in resin, then mass-fabricating the capsules for self-healing by a microfluidic method, and by measuring the kinetic distance of the capsules containing different amounts of cip under the action of a magnetic field strength. The results show that with the increase of the amount of cip, the active distance of the capsule also increases. When the cip is 8wt%, the active distance reaches 1.75cm. We believe this research can provide momentum for the development of self-healing capsule applications.

• Advances in materials Research
• /
• 제13권3호
• /
• pp.221-232
• /
• 2024

Waste tire management and recycling have grown to be significant issues because they bring up a global environmental concern. Thus, turning recycled waste tires into useful products may help tackle the environmental issue. This research aims to study and compare the effect of recycled carbon black (rCB) and commercial carbon black (CB) at certain 15 vol. % of filler loading on the mechanical, thermal, morphology and electrical properties of epoxy/CB composites. For this project, epoxy resin, diethyltoluenediamine (DETDA), recovered carbon black (rCB) and commercial carbon black (CB) graded N330, N550, N660 and N774 were mixed and compared accordingly to the formulation determined. The CB content was dispersed in the epoxy matrix using the mechanical mixing technique. The distribution and dispersion of CB in the epoxy matrix affect the characteristics of the conductive composites. rCB content at 15 vol% was selected at fixed content for comparison purposes due to the optimum value in electrical conductivity results. The flexural strength results followed the sequence of rCB>N774>N660>N550>N330. As for electrical conductivity results, epoxy/N330 exhibited the highest conductivity value, while the others achieved a magnitude of X10^-3 due to the highest external surface area of N330. In terms of thermal stability, epoxy/N330 and epoxy/N774 were slightly more stable than epoxy/rCB.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
• /
• pp.200.2-200.2
• /
• 2010

This study was carried out in order to reduce the amount of underground water which is used in the water curtain system for retaining heat. To proceed to the research, two plastic green houses of water curtain system were installed. One was equipped of internal small tunnel for keeping warm air in the interior of the house. Then the internal small tunnel for keeping warm air was fitted with PVC duct of 50cm in diameter filled with subsurface water. Storing surplus solar energy in the water filled in PVC duct was the method used to this house. Another was installed with FCU in the middle of the house, and was fitted a circulation motor in water tank for heat storage which was operated from 10 a.m. to 4 p.m. in order to interchange heat with FCU. The latter was installed with four FCUs which has a capacity of 8000kcal per hour. Consequently about 5 degrees celsius could be maintained in the interior of the internal small tunnel for keeping warm air with the external temperature of more than minus 5 degrees celsius. It appeared that the alteration of an internal temperature of the house was flexible depending on the sunlight during daytime. It happened that to prevent the water from freezing, mixing antifreezing liquid in the flowing water of FCU or changing the operating method of FCU was a suitable measure. Also, in order to use the surplus solar thermal energy on plastic green house of water curtain system efficiently, storing the surplus heat during daytime simultaneously finding a method of using water curtain systematic underground water happened to be important. As a result of this research, when the house's interior temperature is below zero the operation of FCU appeared to be impossible. Therefore when supposed that the amount of water used in the house is 150~200ton for stable operation of FCU, using the system mentioned in the above research happened to be appropriate of reducing the amount of subsurface water from 80% to 100% when maintaining the interior of internal small tunnel's temperature for keeping warm air of 5 degrees celsius at the extreme temperature of minus 5 degrees celsius.

• 디자인학연구
• /
• 제17권2호
• /
• pp.403-412
• /
• 2004

애니메이션은 끈임 없는 리얼리티의 변형을 시도하며 발전해 왔다. 애니메이션의 그러한 시도가 사회문화현상 중 하나인 포스트모더니즘이란 문화적 특징 속에서 어떻게 리얼리티를 표현하고 변화되며 발전되었는가를 연구하게 될 필요가 있었다. 그 연구를 위해 애니메이션 매체의 특성과 포스트모더니즘의 특징을 알아보고자 하였다. 또한, 그것을 근거로 포스트 모더니즘의 특징이 애니메이션에 나타난 리얼리티와 어떻게 연관되는지를 알아보고 그 특징을 애니메이션작품을 통해 분석하고 적절히 표현되어지고 있는지를 연구하였다. 그리하여, 자연스럽게 포스트모더니즘의 영향을 받은 애니메이션은 리얼리티를 표현하기 위해서 다음과 같은 특징을 유추할 수 있었다. 첫째, 장 보드리야르의 이론을 바탕으로 한 애니메이션에 나타난 시뮬라시옹 이론이다. 둘째와 셋째는 포스트모더니즘의 일반적 특징을 바탕으로 한 마스터 나레이션의 붕괴에 의한 절대적인 선과 악의 관계에 대한 이분법적 결말의 해체이다. 그리고 장르의 통합으로 인한 기술적 리얼리티의 극사실주의(Hyper-Reality)이다. 이러한 이론적 바탕과 특징을 가지고 본 연구는 극장용 애니메이션 중 애니매트릭스의 작품분석을 통해 어떻게 포스트모던 리얼리티가 표현되어지고 재해석되어지는지를 논의해보고자 한다.

• 한국근적외분광분석학회:학술대회논문집
• /
• 한국근적외분광분석학회 2001년도 NIR-2001
• /
• pp.2111-2111
• /
• 2001

A chemoinfometrical method for evaluating the quantitative determination of crystallinity one polymorphs based on fourie-transformed near-infrared (FT-NIR) spectroscopy was established. A direct comparison of the data with the ones collected from using the and compared with the conventional powder X-ray diffraction method was performed. [Method] The pPure a and g forms of indomethacin (IMC) were prepared by reportedusing published methods. Six kinds of standard samples obtained by physically mixing of a and g forms. After the powder X-ray diffraction profiles of samples have been measured, the intensity values were normalized to against the intensity of silicon powder as the as an external standard. The calibration curves for quantification of crystal content were based upon the total relative intensity of four diffraction peaks from of the form g crystal. FT-NIR spectra of six calibration sample sets were recorded 5 times with the NIR spectrometer (BRAN+LUEBBE). Chemoinfometric analysis was performed on the NIR spectral data sets by applying the principal component regression (PCR). [Results] The relation between the actual and predicted polymorphic contents of form g IMC measured using by the X-ray diffraction method shows a good straight linen linear relation., and it has slope of 0.023, an intercept of 0.131 and a correlation coefficient of 0.986. PCR analyses wereis was performed based on normalized NIR spectra sets offer standard samples of known content of IMC g form. IMC. A calibration equation was determined to minimize the root mean square error of the predictionthe prediction. Figure 1 shows a plot of the calibration data obtained by NIR method between the actual and predicted contents of form g IMC. The predicted values were reproducible and had a smaller standard deviation. Figure 2 shows that the plot for the predicted transformation rate (%) of form a IMC to form g as measured by X-ray diffractomeoy against to those as measured by NIR method. The plot has a slope of 1.296, an intercept of 1,109, and a correlation coefficient of 0.992. The line represents a satisfactory correlation between the two predicted values of form g IMC content. Thus NIR spectroscopy is an effective method for the evaluation to the pharmaceutical products of quantitative of polymorph.

• 만화애니메이션 연구
• /
• 통권19호
• /
• pp.145-159
• /
• 2010

캐릭터 산업은 여타의 문화콘텐츠 산업과 같이 창작된 콘텐츠와 더불어 미디어라는 기술적 환경을 토대로 한다. 즉, 창작 캐릭터가 미디어를 통해 수용2자에게 도달되고 이를 기반으로 시장에서 형성된 캐릭터의 브랜드 가치를 바탕으로 라이선싱을 통해 이루어지는 산업이라 할 수 있다. 캐릭터의 생명력을 연장시키고 브랜드로서의 가치를 높이기 위해서는 효율적인 미디어의 선택과 활용이 필요하다. 웹툰 역시 웹툰 캐릭터가 브랜드로서 발전하기 위해 인터넷 미디어를 활용한 마케팅 수단 중 하나로 볼 수 있다. 또한 타 미디어에 비해 짧은 기간에 적은 비용으로 제작하여 시간, 장소에 구애 받지 않고 콘텐츠의 전달이 가능하다. 그리고 쌍방향 소통, 미디어 확산이 용이한 디자인적 형태와 매체적 특성을 가지고 있다. 국내 웹툰 캐릭터의 사례를 분석한 결과, 인터넷 미디어를 중심으로 한 캐릭터 마케팅이 가장 효율적이었다. 또 캐릭터 브랜드화를 위해서는 전략적인 미디어믹스 전개가 필요한 것으로 나타났다. 아울러 웹툰 캐릭터의 외형적, 매체적 특성이 일관된 아이덴티티를 유지해야 효과적인 미디어믹스가 가능하다. 캐릭터가 수용자에게 도달되는 과정에서 미디어믹스가 실질적으로 어떤 작용을 하는지 알기 위해 캐릭터 '하마탱'을 개발하였다. 더불어 자체 제작한 웹툰과 기타 콘텐츠를 활용한 마케팅 과정과 캐릭터 브랜드 구축방안, 그리고 타 미디어로의 변경과 확장을 위한 미디어믹스 전략을 제시하였다.