• 전기학회논문지
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• 제65권8호
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• pp.1369-1375
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• 2016

A rapid progress of the next-generation non-volatile memory device has been made in recent years. Metal/insulator/Metal multi-layer structure resistive RAM(ReRAM) has attracted a great deal of attention because it has advantages of simple fabrication, low cost, low power consumption, and low operating voltage. This paper describes the working principle of the ReRAM device, a review of fabrication techniques, and characteristics of flexible ReRAM devices using graphene oxide as an insulating layer and ReRAM devices using multi-layered insulator. The switching characteristics of the above ReRAM devices have been compared. The oxidized graphene could be employed as an insulator of next generation ReRAM devices.

• Journal of Advanced Marine Engineering and Technology
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• 제41권2호
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• pp.140-145
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• 2017

Newly designed vapor-injection heat pumps have been proposed and analyzed in the present study. An economizer-type vapor-injection (V-I) system has been employed as the standard system because of its reliability and simple control method. The V-I system has a re-cooler and re-heater for cooling and heating, respectively. Solar panels have been installed in the V-I heat pump as well as in the re-heater in order to enhance heating capacity and performance. R410A has been employed as a working fluid and performance analysis has been conducted under various conditions. Results are summarized as follows: (1) The V-I system with the re-cooler yielded a marginally higher coefficient of performance (COP) than the conventional V-I refrigeration system. (2) By increasing the re-cooler cooling capacity, enhanced system performance as compared to the conventional V-I system was observed. (3) The re-heater negatively affected the system performance; hence, the V-I heat pump with the re-heater yielded a lower COP than that of the conventional V-I heat pump used for heating. (4) Although the solar panels increased the system performance, this increase could not offset performance degradation by the re-heater.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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• pp.688-689
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• 2006

Ni-doped $CoSb_3$ was prepared by the encapsulated induction melting and hot pressing, and its doping effects on the thermoelectric properties were investigated. Single phase $\delta-CoSb_3$ was successfully obtained by the subsequent heat treatment at 773K for 24 hours. Nickel atoms acted as electron donors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by the appropriate doping.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 1999년도 추계학술발표회 초록집
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• pp.94-95
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• 1999

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.1198-1199
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• 2006

Type I clathrate $Ba_8Al_{16}Si_{30}$ was produced by arc melting and hot pressing and thermoelectric properties were investigated. Negative Seebeck coefficient at all temperatures measured, which means that the majority carriers are electrons. Electrical conductivity decreased by increasing temperature and thermal conductivity was 0.012 W/cmK at room temperature and dimensionless thermoelectric figure of merit (ZT) was 0.01 at 873K.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2009년도 춘계학술대회 논문집
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• pp.142-142
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• 2009

전자 소자 배선 재료로 이용되는 Cu의 확산 방지막으로서 170nm 두께의 전해 Ni-Re-P 합금 피막이 Cu substrate 위에 제조되었으며 피막특성 및 확산 거동을 연구하였다. 도금 피막내의 P와 Re의 조성분석은 WDXRF로 분석하였으며, 각 함량은 6wt.%와 10wt.%였다. DSC와 XRD는 Ni-Re-P 피막의 결정화 온도가 Ni-P 피막보다 높다는 것을 보여줬다. 이 결과는 Ni-Re-P 피막의 열적 안정성이 Ni-P피막보다 더 우수하다는 것을 나타낸다.

• 한국표면공학회지
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• 제41권3호
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• pp.88-93
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• 2008

Ir-Re thin films with Ti interlayer were deposited onto the tungsten carbide substrate by ion beam assisted DC magnetron sputtering. The Ir-Re films were prepared with targets of having two atomic percent of 7:3 and 5:5. The microstructure and surface analysis of the specimen were conducted by using SEM, XRD and AFM. Mechanical properties such as hardness and adhesion strength of Ir-Re thin film also were examined. The interlayer of pure titanium was formed with 100 nm thickness. The film growth of Ir-30at.%Re was faster than that of Ir-50at.%Re in the same deposition conditions. Ir-Re thin films consisted of dense and columnar structure irrespective of the different target compositions. The values of hardness and adhesion strength of Ir-30at.%Re thin film coated on WC substrate were higher than those of Ir-50at.%Re thin film.

• 공업화학
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• 제33권2호
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• pp.195-201
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• 2022

본 연구에서는 지황 추출물[Rehmannia glutinosa extract (RE)]이 함유된 chitosan (CH) 기반 바이오 소재를 제조하고, 물리·화학적 특성, RE 방출 특성, 멜라닌 합성 억제 효과, 항산화 효과, elastase 억제 효과를 조사하였다. RE 함유 CH기반 바이오 소재는 casting method와 UV 경화 공정을 통해 제조되었다. 제조된 바이오 소재의 표면 특성은 FE-SEM으로 분석하였고, 물리적 특성은 인장강도, 신축률을 통하여 조사하였다. 경피 약물 전달 시스템을 적용하기 위해 36.5 ℃에서 pH 4.5, pH 5.5, pH 6.5 용액에서와 인공피부를 이용해 제조된 바이오 소재에서 RE의 방출 특성을 조사하였으며, 그 결과, pH 6.5에서 가소제를 첨가하지 않은 바이오 소재와 가소제[glycerol (GL)와 citric acid (CA)]를 첨가하여 제조한 RE 함유 바이오 소재에서 RE의 방출이 pH 4.5에서 보다 약 1.10배 빠르게 일어남을 알 수 있었다. 또한, 인공 피부에서 RE의 방출은 약 6 h 동안 지속적으로 방출됨을 확인하였다. Tyrosinase assay, 2,2-diphenyl-1-picrylhydrazyl(DPPH) assay, elastase assay를 통해 기능성을 평가하였으며, 가소제로 CA를 첨가하고 RE가 함유된 바이오 소재에서 각각 45.12%의 tyrosinase 활성율, 89.40%의 DPPH 라디칼 소거능, 59.94%의 elastase 활성율을 나타내었다.

• Journal of Information Processing Systems
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• 제15권4호
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• pp.785-796
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• 2019

Due to the view point, illumination, personal gait and other background situation, person re-identification across cameras has been a challenging task in video surveillance area. In order to address the problem, a novel method called Joint Bayesian across different cameras for person re-identification (JBR) is proposed. Motivated by the superior measurement ability of Joint Bayesian, a set of Joint Bayesian matrices is obtained by learning with different camera pairs. With the global Joint Bayesian matrix, the proposed method combines the characteristics of multi-camera shooting and person re-identification. Then this method can improve the calculation precision of the similarity between two individuals by learning the transition between two cameras. For investigating the proposed method, it is implemented on two compare large-scale re-ID datasets, the Market-1501 and DukeMTMC-reID. The RANK-1 accuracy significantly increases about 3% and 4%, and the maximum a posterior (MAP) improves about 1% and 4%, respectively.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.935.1-935.1
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• 2006