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Gayeong Lim,Shang Hun Shin,Tae Young Lee,Woon-Jung Kwon,Byeong-Su Park,Soon Chan Kwon 대한영상의학회 2022 대한영상의학회지 Vol.83 No.4
Purpose To evaluate the safety and efficacy of stent-assisted coil embolization (SAC) in acutely ruptured cerebral aneurysms without severe symptoms, and thus, the usefulness of the stent itself in patients with subarachnoid hemorrhages. Materials and Methods From January 2017 to June 2019, 118 patients were treated with coil embolization for acutely ruptured cerebral aneurysms without severe symptoms (Hunt & Hess grade ≤ 3). The periprocedural complications, six-month modified Rankin scores (mRS), and six-month radiologic outcomes were compared between 56 patients with SAC and 62 patients without SAC (non-SAC). Results The rate of good clinical outcomes (mRS ≤ 2), as well as the rate of hemorrhagic and ischemic complications, showed no significant difference between the SAC and non-SAC groups. Moreover, compared to the non-SAC group, the SAC group showed a lower recanalization rate on the six-month follow-up angiogram (20% vs. 39.3%, p = 0.001). Conclusion Although stent use was not significantly associated with clinical outcomes in coil embolization of ruptured cerebral aneurysms with non-severe symptoms (Hunt & Hess grade ≤ 3), it significantly decreased the rate of recanalization on follow-up cerebral angiograms.
무효전력 송전 손실을 고려한 tracing algorithm 개발
김가영(Gayeong Kim),서상수(Sangsoo Seo),최윤혁(Yun-Hyuk Choi),이병준(Byongjun Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
현재 우리나라는 매년 전력 수요가 증가하고 송전선의 장거리화 등으로 인하여 무효전력 손실이 증가하여 계통의 전압 안정도에 큰 영향을 미치고 있다. 따라서 계통의 전압 안정성을 높이기 위해서 무효전력의 효율적인 관리가 필요하며, 특히 발전기 무효전력 출력이 미치는 영향을 파악해야 한다. Reactive power tracing이란 특정 부하에서 소비하는 무효전력이 어느 발전원에서 얼마만큼을 공급받는지 무효전력의 흐름을 분석하여 분배량을 계산하는 방법이다. 이러한 사실에 기초하여 본 논문에서는 Reactive power tracing algorithm을 간단한 시험계통에 적용시켜 특정 부하에서 공급받는 무효전력이 어느 발전기로부터 공급받는 것인지 확인하고 Reactive power tracing algorithm의 효용성을 검토한다.
소비 전력 테이블 생성을 통한 부채널 분석의 성능 향상
고가영(Gayeong Ko),진성현(Sunghyun Jin),김한빛(Hanbit Kim),김희석(HeeSeok Kim),홍석희(Seokhie Hong) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.4
차분전력분석공격은 추측하는 비밀 정보 값에 따라 계산한 중간 값을 전력 소비 모델에 대입하여 전력 소비량을 구한 후 실제 발생한 전력 소비량과 함께 분석하여 암호화에 쓰인 비밀 정보 값을 복원한다. 이 때 흔히 쓰이는 전력 소비모델로는 해밍 웨이트 모델이나 해밍 디스턴스 모델이 있으며 좀 더 정확한 전력 소비 모델을 구하기 위해서 전력 모델링 기법을 이용한다. 하지만 공격 타켓이 되는 장비가 가정한 전력 소비 모델과 상이한 경우 중간 값에 해당하는 전력소비량을 옳게 반영하지 못하는 문제가 발생한다. 본 논문에서는 실제 공격 장비에서 측정한 소비 전력을 테이블 형태로 저장하여 전력 소비 모델로써 이용하는 방법을 제안한다. 제안하는 방법은 암호화 과정에서 활용 가능한 정보(평문, 암호문 등)가 쓰이는 시점에서의 소비 전력을 이용한다. 이 방법은 사전에 탬플릿 구성을 할 필요가 없으며 실제 공격장비에서 측정한 소비 전력을 이용하기 때문에 해당 장비의 소비 전력 모델을 정확하게 반영한다. 제안하는 방법의 성능을 확인하기 위해 시뮬레이션과 실험을 진행하였으며 제안하는 방법의 성능이 기존의 전력 모델링 기법보다 부채널공격 성능이 향상됨을 확인하였다. The differential power analysis calculates the intermediate value related to sensitive information and substitute into the power model to obtain (hypothesized) power consumption. After analyzing the calculated power consumption and measuring power consumption, the secret information value can be obtained. Hamming weight and hamming distance models are most commonly used power consumption model, and the power consumption model is obtained through the modeling technique. If the power consumption model assumed by the actual equipment differs from the power consumption of the actual equipment, the side channel analysis performance is declined. In this paper, we propose a method that records measured power consumption and exploits as power consumption model. The proposed method uses the power consumption at the time when the information (plain text, cipher text, etc.) available in the encryption process. The proposed method does not need template in advance and uses the power consumption measured by the actual equipment, so it accurately reflects the power consumption model of the equipment.. Simulation and experiments show that by using our proposed method, side channel analysis is improved on the existing power modeling method.
어포던스(Affordance) 개념을 기반으로 하는 현대가구디자인 연구
양가영(Gayeong Yang) 한국가구학회 2020 한국가구학회지 Vol.31 No.3
Contemporary design asks for inducing the interactive behaviors between things and users, taking the human being’s position into account, not just the technological part. The furniture that does not consider the user’s position may cause an error of action, and as a way of supplementing this, this study would propose the application of the concept of “affordance” to furniture. First, this study would investigate the potential of the philosophy of Bauhaus as the basis for the generation of affordance and would then examine what the modern flow is like and what concept affordance is through the major scholars’ views and examples. Also, this study would approach from the cognitive psychological aspect of affordance to propose a method for applying unconscious affordance to furniture. Through this, hopefully, this study would be helpful for a design by which designers can increase users’ satisfaction by promoting qualities, like the convenience and functionality of furniture in the future.
XPS 분석을 활용한 아민으로 개질된 Vinylbenzyl Chloride-Styrene-Divinylbenzene 삼원 공중합체의 NO<SUB>x</SUB> 가스 흡착 제거 평가
윤가영(Gayeong Yun),구권모(Kwon Mo Koo),이동엽(Dong Yeob Lee),김양수(Yangsoo Kim) 한국고분자학회 2020 폴리머 Vol.44 No.1
NOx 가스는 발생원이 다양하며 높은 독성을 갖는 산성가스 중 하나이다. 본 연구에서는 삼원 공중합체에 아민그룹을 개질시킨 EDA-VBC-S-DVB를 NOx 가스 흡착 제거 물질로 사용하였으며 가교반응에 따른 흡착성능을 비교분석하기 위해 가교제 첨가량을 변화시키면서 제조하였다. NOx 가스 공급용량을 변화시키며 흡착실험을 수행하였으며 XPS 정량분석을 통해 EDA-VBC-S-DVB의 NOx 가스 흡착용량을 평가하였다. 가교제 첨가량과 NOx 가스공급용량에 따라 NOx 가스 흡착용량이 증가하였으며 본 연구에서 제조한 EDA-VBC-S-DVB의 경우 NOx 가스 공급용량 임계치는 12.96 mL·h, NOx 가스 흡착용량 최대치는 1.2182 mmol/g, NOx 가스 상대 흡착용량은 392%를 보여주었다. Nitrogen oxide (NOx) is one of the highly toxic acid gases. In this study, EDA-VBC-S-DVB compound, which is an amine modified terpolymer, was used as a NOx gas adsorption removing material and it was prepared by changing the amount of crosslinking agent in order to evaluate the NOx gas adsorption capacity. Adsorption experiment was carried out with the variation of adsorption time and NOx gas supply capacity. The NOx gas adsorption capacity was quantitatively estimated by the application of XPS analysis and it increased with the amount of crosslinking agent and the NOx gas supply capacity. EDA-VBC-S-DVB compound prepared in this study showed 12.96 mL·h for the critical point of the NOx gas supply capacity, 1.2182 mmol/g for the maximum value of the NOx gas adsorption capacity, and 392% for the maximum value of the NOx gas relative adsorption capacity.
이가영 ( Gayeong Lee ),김나원 ( Nawon Kim ),김용진 ( Yong-jin Kim ) 한국폐기물자원순환학회 2023 한국폐기물자원순환학회지 Vol.40 No.1
The amounts of waste plastics continue to increase rapidly each year. Recycling, incineration, and landfilling are the main treatment and disposal processes of waste plastics. Indeed, although incineration has been used to decompose and remove plastic products, it is considered one of the main sources of microplastics (MPs). In recent years, various methods for extracting MPs from environmental media have been proposed by researchers. However, there is still no standardized method for the extraction of MPs. In this study, therefore, in order to efficiently extract MPs from incineration ash (i.e. bottom and fly ashes), separation solution, stirring method, and number of extraction were investigated. Except for the saturated NaCl saturated, good recovery rates were observed in the separation experiments with Oil + 5 g-NaCl/L and ZnCl<sub>2</sub> solutions, ranging from 63 to 80%. In addition, a good recovery rate was observed when using a magnetic stirrer, except for experiments with the ZnCl<sub>2</sub> solution. However, although the extraction was carried out three times in this study, MPs were still detectable, suggesting incomplete extraction of MPs. The obtained recovery rates were not higher than those reported in previous related studies, which might be due to the differences in the samples and the characteristics of MPs with different densities. During the separation process of supernatants, it is necessary to pay attention to the handling process of containers in contact with the samples, as MPs tend to stick to the container walls. Therefore, further related studies are required to develop effective methods for extracting MPs from incinerator ashes.