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서태석 ( Seo¸ Tae-seok ),김강민 ( Kim¸ Kang-min ),이현승 ( Lee¸ Hyun-seunh ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
In Japan, ultra-low shrinkage concrete has been developed and commercialized to control drying shrinkage cracks to the limit. However, in the case of South Korea, the study on this technology has not yet been conducted in earnest. Therefore, the study was conducted for the development of ultra-low shrinkage concrete to control the drying shrinkage crack of concrete to the limit, and in this study, after determining the mixture of ultra-low shrinkage concrete, a wall type mock-up specimen was produced to observe the shrinkage behavior of ultra-low shrinkage concrete.
Path Following Control of Mobile Robot Using Lyapunov Techniques and PID Cntroller
TaeSeok Jin,Han-Ho Tack 한국지능시스템학회 2011 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.11 No.1
Path following of the mobile robot is one research hot for the mobile robot navigation. For the control system of the wheeled mobile robot(WMR) being in nonhonolomic system and the complex relations among the control parameters, it is difficult to solve the problem based on traditional mathematics model. In this paper, we presents a simple and effective way of implementing an adaptive following controller based on the PID for mobile robot path following. The method uses a non-linear model of mobile robot kinematics and thus allows an accurate prediction of the future trajectories. The proposed controller has a parallel structure that consists of PID controller with a fixed gain. The control law is constructed on the basis of Lyapunov stability theory. Computer simulation for a differentially driven nonholonomic mobile robot is carried out in the velocity and orientation tracking control of the nonholonomic WMR. The simulation results of wheel type mobile robot platform are given to show the effectiveness of the proposed algorithm.
3D Walking Human Detection and Tracking based on the IMPRESARIO Framework
TaeSeok Jin,Hideki Hashimoto 한국지능시스템학회 2008 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.8 No.3
In this paper, we propose a real-time people tracking system with multiple CCD cameras for security inside the building. The camera is mounted from the ceiling of the laboratory so that the image data of the passing people are fully overlapped. The implemented system recognizes people movement along various directions. To track people even when their images are partially overlapped, the proposed system estimates and tracks a bounding box enclosing each person in the tracking region. The approximated convex hull of each individual in the tracking area is obtained to provide more accurate tracking information. To achieve this goal, we propose a method for 3D walking human tracking based on the IMPRESARJO framework incorporating cascaded classifiers into hypothesis evaluation. The efficiency of adaptive selection of cascaded classifiers have been also presented. We have shown the improvement of reliability for likelihood calculation by using cascaded classifiers. Experimental results show that the proposed method can smoothly and effectively detect and track walking humans through environments such as dense forests.
Dielectric properties of ZrTiO₄ thin films deposited by DC magnetron reactive sputtering
Taeseok Kim,Byungwoo Park,Kug Sun Hong 한국진공학회(ASCT) 1999 Journal of Korean Vacuum Science & Technology Vol.3 No.2
Paraelectric ZrTiO₄ thin films were synthesized on a Si (100) substrate using DC magnetron reactive sputtering. Films deposited above 400℃ exhibited crystalline characteristics. The dielectric constants (ε) and dielectric losses (tan δ) of as-deposited and annealed films were measured in the 1 ㎒ range using a Pt upper electrode and a phosphorous-doped Si bottom electrode. Preliminary data showed that as the deposition temperature increased, the dielectric losses decreased while the dielectric constants did not change significantly. Similar trends for dielectric losses were observed when the as-deposited samples were annealed at 800℃. The reduction of dielectric losses at high-deposition temperatures and post annealing correlated well with the x-ray diffraction peak widths.
Utilization of Cofactor Regeneration for Acceleration of Fatty Acid Overproduction
Taeseok KIM,Sungkuk LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Oleochemicals, the substitute of petrochemicals, are on the rise as sustainable and bio-based chemicals as recognizing importance of environment costs. Among them, fatty acids and their chemical derivatives abound in our living environment. Here, we have developed engineered fatty acid overproducing strain by enhance of mainstream of fatty acid synthesis pathway. NADH and NADPH are cofactors which significantly involve in metabolic pathway. In Escherichia coli fatty acid synthesis pathway, both NADH and NADPH are essential factors. In E. coli fatty acid synthesis pathway, a NADH and NADPH each are accompanied in fatty acid chain elongation. Therefore, utilizing both cofactors NADH and NADPH have an advantage in overproduction of fatty acid. Especially, in the elongation step, beta keto-ACP reductases (FabG) in E. coli only use NADPH for its reaction. Moreover, it is obvious that NADPH regeneration is less than NADH regeneration in cellular metabolism. It means that NADPH could be limiting factor in fatty acid production. Existing fatty acid overproducing strain could be expected to further increase its fatty acid production by introducing NADPH regeneration system.
DIND Data Fusion with Covariance Intersection in Intelligent Space with Networked Sensors
TaeSeok Jin,Hideki Hashimoto 한국지능시스템학회 2007 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.7 No.1
Latest advances in network sensor technology and state of the art of mobile robot, and artificial intelligence research can be employed to develop autonomous and distributed monitoring systems. In this study, as the preliminary step for developing a multi-purpose “Intelligent Space” platform to implement advanced technologies easily to realize smart services to human. We will give an explanation for the ISpace system architecture designed and implemented in this study and a short review of existing techniques, since there exist several recent thorough books and review paper on this paper. Instead we will focus on the main results with relevance to the DIND data fusion with CI of Intelligent Space. We will conclude by discussing some possible future extensions of ISpace. It is first dealt with the general principle of the navigation and guidance architecture, then the detailed functions tracking multiple objects, human detection and motion assessment, with the results from the simulations run.
TaeSeok Jin,MinJung Lee,Hideki Hashimoto 한국지능시스템학회 2006 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.6 No.4
In this paper, a sensor fusion based robot navigation method for the autonomous control of a miniature human interaction robot is presented. The method of navigation blends the optimality of the Fuzzy Neural Network(FNN) based control algorithm with the capabilities in expressing knowledge and learning of the networked Intelligent Robotic Space(IRS). States of robot and IR space, for examples, the distance between the mobile robot and obstacles and the velocity of mobile robot, are used as the inputs of fuzzy logic controller. The navigation strategy is based on the combination of fuzzy rules tuned for both goal-approach and obstacle-avoidance. To identify the environments, a sensor fusion technique is introduced, where the sensory data of ultrasonic sensors and a vision sensor are fused into the identification process. Preliminary experiment and results are shown to demonstrate the merit of the introduced navigation control algorithm.