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시멘트 제조사 및 W/C 변화에 따른 콘크리트의 초기 강도발현 특성
金光華,裵正烈,김규도,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This study is to investigate the influence of cement manufacturing company and W/C on the properties of fresh concrete, strength of hardened concrete and rebound value of P type Schmidt hammer. According to the result, setting time of concrete is shortened with and increase of W/C, and when cement made in A and B corporation is used in concrete, the final setting time is measured at about 10 hours and 13 hours. Compressive strength increases with elapse of time and decrease of W/C, and concrete using cement made in A corporation shows higher compressive strength and rebound value until 24 hours, but from 3rd day, the contrary tendency is shown. As for the properties of early strength, the strength develop fast with decrease of W/C, and the time when compressive strength of 5MPa is gained and the form can be removed, is about 15, 18, 21 hours and 20, 22, 27 hours at the W/C 40, 45, 50% in concrete using cement made in A and B Co. respectively. The correlativity between compressive strength and the rebound value, which a coefficient of correlation is over 0.97, is very favorable. Therefore this method is effective to estimate the strength of removing the form.
A Study on the Realization of Virtual Simulation Face Based on Artificial Intelligence
Zheng-Dong Hou,Ki-Hong Kim,Gao-He Zhang,Peng-Hui Li The Korea Institute of Information and Commucation 2023 Journal of information and communication convergen Vol.21 No.2
In recent years, as computer-generated imagery has been applied to more industries, realistic facial animation is one of the important research topics. The current solution for realistic facial animation is to create realistic rendered 3D characters, but the 3D characters created by traditional methods are always different from the actual characters and require high cost in terms of staff and time. Deepfake technology can achieve the effect of realistic faces and replicate facial animation. The facial details and animations are automatically done by the computer after the AI model is trained, and the AI model can be reused, thus reducing the human and time costs of realistic face animation. In addition, this study summarizes the way human face information is captured and proposes a new workflow for video to image conversion and demonstrates that the new work scheme can obtain higher quality images and exchange effects by evaluating the quality of No Reference Image Quality Assessment.
AlGaN/GaN heterostructure pH sensor with multi-sensing segments
Dong, Yan,Son, Dong-hyeok,Dai, Quan,Lee, Jun-Hyeok,Won, Chul-Ho,Kim, Jeong-Gil,Kang, Seung-Hyeon,Lee, Jung-Hee,Chen, Dunjun,Lu, Hai,Zhang, Rong,Zheng, Youdou Elsevier 2018 Sensors and actuators. B, Chemical Vol.260 No.-
<P><B>Abstract</B></P> <P>pH sensor is very important in various fields, and has triggered many types of devices based on different materials and mechanisms. How to improve the performances of the sensors is one of major challenges now. In the present paper, we developed an idea to improve the sensitivity of pH sensors based on AlGaN/GaN high-electron-mobility transistors (HEMTs) by introducing multi-sensing segments, and experimentally fabricated prototype devicesand then investigated their responses to aqueous solutions under different pH values. The optimized sensor exhibits a very high linear sensitivity of 1.35 mA/pH at drain-source voltage of 1.5 V, which is much higher than those of conventional pH sensors with single open gate sensing area. This indicates that the multi-sensing segments is very effective in increasing the sensitivity of the pH sensor, rather than simply increasing the sensing area. The sensors degrade after measurement in solution for a long working time, but they can recover to their initial states in a certain duration after washing, typically ∼24 h. Our finding paves new strategy for the future design of high sensitive and stable pH sensors based on HEMTs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel multi-sensing segments pH sensor is designed and fabricated by using AlGaN/GaN high electron mobility transistor. </LI> <LI> Realizing very high sensitivity on the multi-sensing sensor, which is much higher than that of conventional geometric pH sensor. </LI> <LI> Achieved excellent performance stability with good recovery feature on the multi-sensing sensor. </LI> </UL> </P>
Dong Wook Lee,Zheng-Dong Ma,Noboru Kikuchi 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.37 No.6
A concept of crash energy absorbing (CEA) lattice structure for an inflatable morphing vehicle body (Lee et al. 2008) has been investigated as a method of providing rigidity and energy absorption capability during a vehicular collision (Lee et al. 2007). A modified analytical model for the CEA lattice structure design is described in this paper. The modification of the analytic model was made with a stiffness approach for the elastic region and updated plastic limit analysis with a pure plastic bending deformation concept and amended elongation factors for the plastic region. The proposed CEA structure is composed of a morphing lattice structure with movable thin-walled members for morphing purposes, members that will be locked in designated positions either before or during the crash. What will be described here is how to model the CEA structure analytically based on the energy absorbed by the CEA structure.
정동매 ( Dong-mei Zheng ),김학철 ( He-zhe Jin ) 중국어문연구회 2015 中國語文論叢 Vol.0 No.72
There are two similar features about Jin Yingxia, a writer from South Korea and Yu Hua from China. Both of them explore the thing of death in aesthetic style, and they also get the critical consciousness to fathers. This paper takes their novels as sample to study the features and differences of patricide consciousness in these works, to analyze the patricide impulsion and perplexity of these young writes who grew in cultural atmosphere of patriarchal system and matured in industrialized society of great change, and then reveals their introspection and seeking on social order. The two writers both grew in East Asian society with background of traditional Confucian culture, but because of different social system and culture, there are profound differences in their understanding on fathers. Jin Yingxia denied the capitalistic New Order based on interest relationship, but he still hovered in imaginative reconstruction of ideal society, while Yu Hua focused on history by revealing tininess of individual. The figure of fathers are ridiculed and deleted in Jin’s novels, while investigated and blamed in Yu’s work. As contemporary writers, they both took themselves in a contradiction of patricide impulsion and fear of lost their fathers. That is, when they attempted the new possibility of patricide consciousness, it’s hard to hide their restlessness and anxiety, and then showed their intention to do redemption for their fathers.