• Korean Chemical Engineering Research
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• 제57권4호
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• pp.475-483
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• 2019

화학적 무기 중 혈액작용제는 전자전달계 내 효소의 철 이온과 반응하고 세포호흡을 정지시켜 사망을 초래한다. 혈액작용제는 활성탄의 미세공보다 분자크기가 작아 화학적 흡착이 유일한 제독방법이다. 본 연구는 SG 생활안전에서 개발한 SG-1 가스 여과기를 이용하여 혈액작용제 시아노겐 클로라이드(CK) 가스의 유입에 따른 유동해석을 수행하였다. 구리, 은, 아연 및 몰리브데늄 이온이 첨착된 ASZM TEDA 활성탄을 적용하여 가스 여과기 제작 시험 규정에 따라 화학적 흡착 모사를 수행하였으며 흡착 Kinetic을 적용하기 위해 선 수행된 흡착 베드에서 CK 가스 흡착 실험 결과를 분석하였다. 화학적 흡착을 통해 발생되는 가스 여과기 내부 압력강하 및 가스 흡착 질량 등 주요 변수의 동적거동을 예측하였다. CFD에서 다공성 물질을 적용할 때 사용하는 Ergun 방정식 대신 Granular와 Packed bed를 사용하여 활성탄 적용 가능 결과를 확인하였으며 시간에 따른 흡착 및 유속에 따른 흡착의 유동 해석에 대한 동적 모사를 수행하였다.

• 융합신호처리학회논문지
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• 제5권2호
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• pp.119-125
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• 2004

방향 성분은 소벨(sobel)과 FFT 방법 등을 주로 사용한다. 소벨을 이용한 방법은 소벨 마스크의 복잡한 처리 과정과 대표 방향 성분을 추출하고자 할 때 픽셀별로 단위 벡터를 만들어 누적시킬 경우 낮은 대비 영상이나 높은 대비 영상이나 같은 값이 나오므로 기울기 크기를 누적할 수 없어 대표 방향을 설정하기 어렵다. FFT를 변환을 이용한 방법은 융선이 정확한 방향 성분을 가지는 경우에만 방향성 추출이 가능하며 별도의 방향 필터를 사용해야 한다. 본 논문에서는 위의 단점을 보완하기 위하여 이진화 된 영상을 세선화 한 후 픽셀 단위로 방향 성분을 추출하며, 8${\times}$8 픽셀크기의 블록 내에 존재하는 픽셀이 가지는 방향 성분 중 가장 많은 방향 성분을 융선의 대표 방향으로 추출하는 새로운 방법을 제안한다.

• Journal of information and communication convergence engineering
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• 제12권4호
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• pp.237-245
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• 2014

In this study, software-based countermeasures against a side-channel cryptanalysis of the Rabbit stream cipher were developed using Moteiv's Tmote Sky, a popular wireless sensor mote based on the Berkeley TelosB, as the target platform. The countermeasures build upon previous work by improving mask generation, masking and hiding other components of the algorithm, and introducing a key refreshment scheme. Our contribution brings improvements to previous countermeasures making the implementation resistant to higher-order attacks. Four functional metrics, namely resiliency, robustness, resistance, and scalability, were used for the assessment. Finally, performance costs were measured using memory usage and execution time. In this work, it was demonstrated that although attacks can be feasibly carried out on unprotected systems, the proposed countermeasures can also be feasibly developed and deployed on resource-constrained devices, such as wireless sensors.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.792-797
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• 2002

In the following paper two algorithms, suitable for the analysis of panchromatic data as provided by KOMPSAT-1 will be presented. One is a texture analysis which will be used to create a settlement mask based on the variations of gray values. The other is a fusion algorithm which allows the combination of high resolution panchromatic data with medium resolution multispectral data. The procedure developed for this purpose uses the spatial information present in the high resolution image to spatially enhance the low resolution image, while keeping the distortion of the multispectral information to a minimum. This makes it possible to use the fusion results for standard multispecatral classification routines. The procedures presented here can be automated to large extent, making them suitable for a standard processing routine of satellite data.

• 보건행정학회지
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• 제30권2호
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• pp.139-141
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• 2020

Coronavirus disease 2019 (COVID-19) is currently in progress. Although it is difficult to predict the end of currently increasing COVID-19, it is expected to last for a long time. The COVID-19 is making a lot of changes. Due to physical distancing and living distancing, non-contacts such as wearing facial masks, online lectures, online medical services, telecommuting, and telemarketing are becoming common. In the era of post-COVID-19, online and offline will coexist. Many countries following China's lockdown strategy, which is agreed with the World Health Organization, should be changed to Taiwan's facial mask strategy for reducing the economic problems. The prolonging COVID-19 will add to the economic difficulties, and the US-China confrontation will be difficult to rebound the global economy. COVID-19, such as plaque, smallpox, and Spanish influenza, will be a historical momentum. How to respond to the crisis of COVID-19 and post-COVID-19 will determine the future of the world and Korea.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1272-1273
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• 2009

We demonstrate conformal phosphor coating and patterning methods on light emitting diodes (LEDs) using image processing based optofluidic maskless lithography (IP-OFML) system in microfluidic channels. IP-OFML allows a real-time detection and dynamic mask generation for packaging of randomly dispersed microchips. Our system detects each chip by considering rotation of the chip through image processing regardless of their arrangement error. Therefore, it precisely packages the chip making conformal polymer layer.

• Archives of Plastic Surgery
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• 제50권2호
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• pp.220-221
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• 2023

Microsurgical peripheral nerve repair is a technical and challenging procedure that requires thorough training prior to a real-life operating theater scenario. While the gold standard in training remains training on biological living peripheral nerve specimen, various inanimate models of nerve repair simulation have been described in the past years. The textile elastic band (TEB) obtained from a surgical mask was either covered with a fine silicone sheath or was left bare and was used afterward for end-to-end coaptation. The average diameter of the TEB was 2 mm, similar with the nerves in the distal hand and can be easily crafted out of accessiblematerials such as a surgicalmask and silicone sealant. The silicone that covers the TEB offers more fidelity to the simulation for microsurgical nerve coaptation. The TEB model offers an affordable, available, and easy-to-craft alternative to the existing models for peripheral nerve repair simulation and serves as a good initiation tool before moving on to biological specimens.

• 대한화학회지
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• 제11권4호
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• pp.132-137
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• 1967

8-Hydroxy-Quinoline(Qxine)에 依한 高純度 Antimony中 不純物(鐵 및 銅)의 吸光光度 定量法을 檢討하였다. 試料의 黃酸溶液에 안티몬을 Masking하기 위하여 必要한 酒石酸의 影響을 調査한 結果, 0.5M-酒石酸溶液 10ml로서 600mg 까지의 안티몬을 Masking할 수 있었다. pH 範圍는 鐵은 5.0-5.7, 銅은 3.5-4.0이었다. 鐵은 580$m{\mu}$ 에서 吸光度를 測定하면 되나, 銅은 15%苛性소오다溶液으로 逆抽出하고, 남은 鐵을 580$m{\mu}$, 410$m{\mu}$ 에서 測定하여 補正할 必要가 있다. 500mg 안티몬에 對하여 鐵은 150${\mu}g$(0.005~0.03%)까지, 銅은 100${\mu}g$(0.005~0.016%)까지 定量이 可能했다.

• Archives of Pharmacal Research
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• 제23권1호
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• pp.66-71
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• 2000

Peonjahwan, an oriental traditional medicine composed of crude herbal drugs and animal tissues is bitter and poorly water-soluble. To mask the bitterness of peonjahwan and enhance the release of bilirubin, one of the crude active ingredients of peonjahwan, peonja dry elixir (PDE), was prepared using a spray-dryer after extracting the crude materials in ethanol-water solution. coated peonja dry elixir (CPDE) was then prepared by coating the PDE with Eudragit acrylic resin. Panel assessed bitterness and release test of bilirubin from PDE and CPDE were carried out and compared with peonjahwan alone. PDE was found to have little effect upon the reduction of the bitterness of peonjahwan. However, the bitterness of CPDE was found to reduce to 1/4 of that of peonjahwan due to the encapsulation of crude active ingredients by the dextrin and Eudragit shell (P<0.05). The release rate of bilirubin from PDE and CPDE for 60 min increased about 3.5- and 2.5-fold, respectively, compared to peonjahwan at pH 1.2. It is concluded that CPDE, which masked the bitterness of peonjahwan and enhanced the release of bilirubin, is a preferable delivery system for peonjahwan.

• 대한전자공학회논문지SD
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• 제38권12호
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• pp.75-84
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• 2001

오늘날 집적회로의 집적도가 증가되고 있기 때문에 회로 소자는 기생성분의 영향을 최소화하고 회로의 성능을 감소시키는 요인을 최소화하도록 설계되어야 한다. 그래서 칩을 제작하기 전에 레이아웃으로부터 추출한 회로가 정확한가를 검증하고 시뮬레이션으로 추출된 회로가 설계사양을 만족하는지를 확인해야 한다. 본 논문에서는 스택 구조의 MOSFET의 기하학적인 파라미터와 레이아웃 배선 블록의 분산 RC를 추출할 수 있는 새로운 블록 분할 기법을 제안한다. 폴디드 캐스코드 CMOS 연산 증폭기의 레이아웃에 이 기법을 작용하여 회로를 추출하고, Hspice로 시뮬레이션을 수행하여 전기적 연결관계와 이들 소자의 영향을 검증하였다.