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Adhesion Change of AZO/PET Film by ZrCu Insertion Layer
Sang-Won Ko,Jong-Gook Jung,Kyeong-Soon Park,Sil-Mook Lim 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
In order to form an aluminum-doped zinc oxide (AZO) transparent electrode film on a polyethylene terephthalate (PET) substrate used for a flexible display substrate, the AZO transparent electrode was produced at low temperature without substrate heating. Even though the produced electrode showed characteristic optical transmittance of 90 % (at 550 nm) and sheet resistance within 100 Ω/sq, cracks occurred 10 minutes after loading applied 2 mm radius of curvature, and the sheet resistance increased linearly. An insertion layer of ZrCu was formed between the AZO film and the PET substrate to suppress the generation of cracks on the AZO film. It was verified that the crack was not generated 30 minutes after the loading of 2 mm radius of curvature, and no increase in sheet resistance was recorded. There was also not cracks in the dynamic bending test of 4 mm radius, but surface resistance was slightly increased. As a result, the ZrCu insertion film improved the interfacial adhesion between the substrate and AZO film layer without increasing sheet resistance and decreasing transmittance.
Sang Bum Kim,Jin Woo Lim,Jeong Gook Seo,Jeong Ku Ha 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.1
Many complications have been reported during or after anterior cruciate ligament (ACL) reconstruction, including infection, bleeding, tibial tunnel widening, arthrofibrosis, and graft failure. However, arterial injury has been rarely reported. This paper reports a case of an anterior tibial arterial injury during bicortical tibial drilling in arthroscopic ACL reconstruction, associated with an asymptomatic occlusion of the popliteal artery. The patient had a vague pain which led to delayed diagnosis of compartment syndrome and delayed treatment with fasciotomy. All surgeons should be aware of these rare but critical complications because the results may be disastrous like muscle necrosis as in this case.
Synaptic device using a floating fin-body MOSFET with memory functionality for neural network
Woo, Sung Yun,Choi, Kyu-Bong,Lim, Suhwan,Lee, Sung-Tae,Kim, Chul-Heung,Kang, Won-Mook,Kwon, Dongseok,Bae, Jong-Ho,Park, Byung-Gook,Lee, Jong-Ho Pergamon Press 2019 Solid-state electronics Vol.156 No.-
<P><B>Abstract</B></P> <P>We fabricate a floating fin-body MOSFET with charge trap layer on p-type (1 0 0) Si wafer and investigate the characteristics of the fabricated device as a synaptic device. To implement the long-term potentiation (LTP) and long-term depression (LTD), the change in conductance of the proposed device is investigated by adjusting the amount of charge in charge trap layer. A pair of synaptic device with these LTP and LTD is suggested to express the synaptic weight update in a multi-layer neural network. In addition, we show suitable weight-updating method using the proposed devices for implementing multi-layer neural networks. A 3-layer perceptron network consisted of 784 input, 200 hidden, and 10 output neurons was simulated using the conductance response of the proposed devices. In pattern recognition for 28 × 28 MNIST handwritten patterns, high learning performance with a classification accuracy of 95.74% is obtained when the unidirectional weight update method (B) is used.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricated a floating fin-body MOSFET with charge trap layer and investigated the characteristics of the fabricated device as a synaptic device. </LI> <LI> To implement the LTP and LTD, the change in conductance of the proposed device is investigated by adjusting the amount of charge in charge trap layer. </LI> <LI> A pair of synaptic device with these LTP and LTD is suggested to express the synaptic weight update for on-chip training neural network. </LI> </UL> </P>
데이터마이닝을 활용한 기업 R&D역량 특성에 관한 탐색 연구
김상국(Sang-Gook Kim),임정선(Jung-Sun Lim),박완(Wan Park) 한국지능정보시스템학회 2021 지능정보연구 Vol.27 No.1
As the global business environment changes, uncertainties in technology development and market needs increase, and competition among companies intensifies, interests and demands for R&D activities of individual companies are increasing. In order to cope with these environmental changes, R&D companies are strengthening R&D investment as one of the means to enhance the qualitative competitiveness of R&D while paying more attention to facility investment. As a result, facilities or R&D investment elements are inevitably a burden for R&D companies to bear future uncertainties. It is true that the management strategy of increasing investment in R&D as a means of enhancing R&D capability is highly uncertain in terms of corporate performance. In this study, the structural factors that influence the R&D capabilities of companies are explored in terms of technology management capabilities, R&D capabilities, and corporate classification attributes by utilizing data mining techniques, and the characteristics these individual factors present according to the level of R&D capabilities are analyzed. This study also showed cluster analysis and experimental results based on evidence data for all domestic R&D companies, and is expected to provide important implications for corporate management strategies to enhance R&D capabilities of individual companies. For each of the three viewpoints, detailed evaluation indexes were composed of 7, 2, and 4, respectively, to quantitatively measure individual levels in the corresponding area. In the case of technology management capability and R&D capability, the sub-item evaluation indexes that are being used by current domestic technology evaluation agencies were referenced, and the final detailed evaluation index was newly constructed in consideration of whether data could be obtained quantitatively. In the case of corporate classification attributes, the most basic corporate classification profile information is considered. In particular, in order to grasp the homogeneity of the R&D competency level, a comprehensive score for each company was given using detailed evaluation indicators of technology management capability and R&D capability, and the competency level was classified into five grades and compared with the cluster analysis results. In order to give the meaning according to the comparative evaluation between the analyzed cluster and the competency level grade, the clusters with high and low trends in R&D competency level were searched for each cluster. Afterwards, characteristics according to detailed evaluation indicators were analyzed in the cluster. Through this method of conducting research, two groups with high R&D competency and one with low level of R&D competency were analyzed, and the remaining two clusters were similar with almost high incidence. As a result, in this study, individual characteristics according to detailed evaluation indexes were analyzed for two clusters with high competency level and one cluster with low competency level. The implications of the results of this study are that the faster the replacement cycle of professional managers who can effectively respond to changes in technology and market demand, the more likely they will contribute to enhancing R&D capabilities. In the case of a private company, it is necessary to increase the intensity of input of R&D capabilities by enhancing the sense of belonging of R&D personnel to the company through conversion to a corporate company, and to provide the accuracy of responsibility and authority through the organization of the team unit. Since the number of technical commercialization achievements and technology certifications are occurring both in the case of contributing to capacity improvement and in case of not, it was confirmed that there is a limit in reviewing it as an important factor for enhancing R&D capacity from the p
최상욱(Sang Uk Choi),강병관(Byung Kwan Kang),강희석(Hee Seok Kang),선명실(Myung Sil Seon),임국빈(Gook Bin Lim),김청균(Chung Kyun Kim) 한국가스학회 2016 한국가스학회 학술대회논문집 Vol.2016 No.6
본 연구에서는 가스 충전건의 주요 Part인 Long Cylinder와 Valve Body의 두께변화에 따른 강도 안정성 해석을 유한요소해석 프로그램인 NX Nastran을 통해 분석하였다. Long Cylinder의 경우, 두께를 3.5mm부터 0.3mm간격으로 감소시켜 1.7mm까지 3.5MPa의 가스압력으로 측정한 결과, 11.74MPa부터 23.7MPa까지의 Von Mises의 최대응력이 걸리는 것으로 나타났다. Valve Body의 경우, 두께를 3.5mm부터 0.3mm간격으로 감소시켜 1.7mm까지 3.5MPa의 가스압력으로 측정한 결과, 11.62MPa부터 25.42MPa까지의 Von Mises의 최대응력이 걸리는 것으로 나타났다. 이러한 FEM 해석결과는 가스 충전건의 주요 Part인 Long Cylinder, Valve Body에 작용하는 Von Mises의 최대응력 모두가 황동소재의 항복강도인 300MPa 대비 Long Cylinder의 경우 3.91%~7.9% 수준으로 낮은 값을 나타내고 있다. Valve Body의 경우 3.87%~8.47% 수준으로 낮은 값을 나타내고 있다. 이것은 기존의 가스 충전건의 두께가 지나치게 과도하게 설계됨을 의미한다. 따라서 가스 충전건의 경량화 설계를 위해 주요 Part인 Long Cylinder, Valve Body의 두께를 얇게 설계하는 것이 바람직하다.