Eum H.,Yonsei University |
Yoon C.,Suwon Science College
Transactions of the Korean Institute of Electrical Engineers | Year: 2016
In this paper, a method is proposed to recognize human actions as nonverbal expression; the proposed method is composed of two steps which are action representation and action recognition. First, MHI(Motion History Image) is used in the action representation step. This method includes segmentation based on depth information and generates spatio-temporal templates to describe actions. Second, CNN(Convolution Neural Network) which includes feature extraction and classification is employed in the action recognition step. It extracts convolution feature vectors and then uses a classifier to recognize actions. The recognition performance of the proposed method is demonstrated by comparing other action recognition methods in experimental results. © The Korean Institute of Electrical Engineers.
Lee K.,Suwon Science College |
Yim J.,Dongguk University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2015
The first step of accessing computer systems is typing in a user ID and a password. The user management system of the computer system then authenticates the user. Only after authentication is the user allowed to access the computer system. In addition to authentication, authorization is also performed by user management systems. For Internet TV systems, authorization is extremely important because Internet TV channels and videos should only be accessed by authorized users. Furthermore, user management systems record who accessed which TV channels and videos when and how long. This information is used by the billing system. Therefore, we develop a user management system for Internet TV systems. Our user management system controls accessing resources based on the roles of the user. © 2015 SERSC.
Lee H.-S.,Korea University |
Kim S.-H.,Suwon Science College
Journal of the Korean Society of Food Science and Nutrition | Year: 2010
We evaluated the anti-aging potential and safety of black garlic extract for cosmeceutical ingredient. Black garlic was made by spontaneous fermentation for 40 days at 60~70°C, 85~95% RH without any additives. The 10% black garlic extract had sweet odor, antioxidant activities and inhibitory activities of skin againg enzymes such as tyrosinase and elastase. The skin safety was performed to evaluate of potential toxicity using the primary irritation test and skin sensitization test. The black garlic extract did not show any adverse reactions such as erythema and edema on intact skin sites at primary irritation test, but on abraded sites, some experimental animals showed very slight erythema. So, the black garlic extract was classified as a practically non-irritating material based on the score 0.23 of primary irritation index. The skin sensitization study was tested by the guinea pig maximization test (GPMT) and Freund's complete adjuvant (FCA) with intradermal injection of 10% black garlic extract. The skin sensitization test showed no skin sensitization. The allergic sensitization depends on tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6). The concentration of IL-6 on challenged tissue of treated with black garlic extract was not significantly different with negative control group (saline treated group). Based on this study, the potential for black garlic as a cosmeceutical ingredient was proven.
Kim D.W.,Yonsei University |
Chung Y.D.,Suwon Science College |
Kang H.K.,Korea University |
Yoon Y.S.,Shin Ansan University |
Ko T.K.,Yonsei University
IEEE Transactions on Applied Superconductivity | Year: 2012
This paper describes a operating characteristics of contactless power transfer (CPT) system from normal conducting coil to HTS coil based on the electromagnet resonance coupling. The basic principle is that two separate coils with same resonance frequency are possible to form a resonant system based on high frequency magnetic coupling and exchange energy in a high efficiency. The CPT technique with the electromagnetic resonance coupling has been expected as a useful option for contactless charge and storage devices. Since the CPT technology using normal conducting coils is sensitive to tune impedance matching, the transfer power efficiency is limited. From this reason, we proposed the combination CPT technology with superconducting receiver coils, it is called as, superconducting contactless power transfer (SUCPT). The SUCPT system can reduce joint loss of superconducting connection and increase the portability of the superconducting system. In this study, as a fundamental step, the optimal power transfer conditions needed to generate inductive power transfer between normal conducting coils and superconducting coil were experimentally examined. The power transfer profile for coupled resonance coils with high frequency power was investigated in order to minimize operating power. © 2002-2011 IEEE.
Kim E.-K.,Suwon Science College |
Choo J.,Korea University
International Journal of Environmental Research and Public Health | Year: 2012
To explore the prevalence of secondhand tobacco smoke (SHS) exposure of college students at two locations, i.e., on campus and in the home, and to identify factors associated with SHS exposure at each location, a preliminary cross-sectional study was conducted on 1754 nonsmoking students from two universities in Korea. In total, 83.1% were exposed to SHS at least once a week on campus or at home; the average SHS exposure was 3.4 times per week. Specifically, 79.7% and 23.5% were exposed to SHS on campus and in the home, respectively. On campus, SHS exposure was significantly more prevalent in freshmen and sophomore students. In the home, SHS exposure was significantly more prevalent among females, those with smokers in their families, and those who rated their health as poor. SHS exposure was common among nonsmoking college students, with more than two-thirds exposed on campus. The prevalence of SHS exposure was greater on campus than in the home; the factors associated with SHS exposure were location-specific. © 2012 by the authors.
Chung Y.D.,Suwon Science College |
Lee C.Y.,Korea Railroad Institute
9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia | Year: 2015
Recently, the wireless power transfer (WPT) systems have started to be applied to the wireless charging for electrical vehicles and trains because of their advantages compared with the wired counterparts, such as convenience, safety, and fearless transmission of power. However, it has obstacles to commercialize to large power deliver and efficiency in WPT technology. This paper presents the feasibility of technical fusion between wireless power transfer (WPT) system and superconducting magnet technology to enable to charge large power into very low temperature circumstance of superconducting magnet for high speed magnetic levitation (MAGLEV) train without any connector or wire. The superconducting magnet in high speed MAGLEV train system maintains keeps stronger magnetic field that plays a role to sustain stable levitation gap. Generally, the superconducting magnet has been supplied by conventional electric power persistently to keep fixed levitation gap and low irregularity tolerance. However, a large thermal loss is indispensably caused by power transfer wires. Fortunately, since superconducting wires have a higher Q-value intrinsically, transfer selectivity and distance between antenna and receiver coils can be improved easily. Thus, the superconducting receiver (Rx) coil for superconducting magnet can be expected as a reasonable option to deliver large power with high efficiency. In this paper, we designed and investigated wireless power transfer system for the wireless power charging system for superconducting Maglev (WPC4SM) using high temperature superconducting (HTS) receiver. To confirm the capacity of HTS Rx coil, we compared with operating efficiency using normal conducting Rx coil. As a result of investigation, the transfer efficiency with HTS receiver could be successfully improved over 30 % compared with copper receiver at laboratory scale with a purpose built test stand. © 2015 Korean Institute of Power Electronics.
Kim D.-H.,Suwon Science College
Advances in Electrical and Computer Engineering | Year: 2014
In this paper, two new addressing modes are introduced to the 16-bit Thumb instruction set architecture to improve performance of the ARM/Thumb processors. Contrary to previous approaches, the proposed approach focuses on the addressing mode of the instruction set architecture. It adopts scaled register offset addressing mode and post-indexed addressing mode from the 32-bit ARM architecture, which is the superset of the 16-bit Thumb architecture. To provide the encoding space for the new addressing modes, the register fields in the LDM and STM instructions are reduced, which are not frequently executed. Experiments show the proposed extension achieves an average of 7.0% performance improvement for the seven benchmark programs when compared to the 16-bit Thumb instruction set architecture.
Baek S.H.,Hyundai Engineering |
Kim H.J.,Suwon Science College
Biotechnology and Bioprocess Engineering | Year: 2013
Activated Sludge Model no. 1 (ASM1) was modified and applied to Simultaneous Nitrification and Denitrification (SND) in oxygen-limited MBR. In order to calibrate the model correctly, the parametric sensitivity was performed using AQUASIM 2.0 to find the most important coefficients. The most sensitive coefficients in the model of oxygen-limited MBR were related to the growth of heterotrophic biomass. While the total autotrophic biomass concentration (X BA) was decreased by decreasing DO concentration, there was an increase in the nitrite-oxidizing biomass concentration by a small amount. This model also showed that over 97% of permeate Soluble Chemical Oxygen Demand (SCOD) was the Soluble Inert (SI). The model showed the change in the ammonia-oxidizing and nitrite-oxidizing biomass was decreased by decreasing DO concentration. However, there was an increase in the nitrite-oxidizing biomass concentration by a small amount due to the biomass retained in the bioreactor with membrane. It is contradictory to the reported observations for conventional activated sludge process. © 2013 The Korean Society for Biotechnology and Bioengineering and Springer-Verlag Berlin Heidelberg.
Yoon C.,Suwon Science College |
Cheon M.,Yonsei University |
Park M.,Yonsei University
Information Sciences | Year: 2013
Abstract This paper describes a vision-based system for tracking objects from image sequences. The proposed system has the standard architecture with a particle filter which is a popular algorithm to track objects in real time. Many tracking algorithms have a great difficulty in tracking objects robustly by reason of complex background and rapid changes under a real complex environment such as a traffic road. To make a robust algorithm for object tracking, we propose the method that uses the adaptive autoregressive model as a state transition model and the adaptive appearance mixture model as an observation model. But, in case of changing the state of a tracked object suddenly, the adaptive models may not make the optimal parameters for accurate states at current time. Because the noise variance of the adaptive models in this case is larger than that in normal case, it has an effect on the accuracy of an object tracking algorithm. Thus, we propose a fuzzy particle filter to overcome problems from the occurrence of the unexpected improper variances due to several causes. In this paper, as the process noises and the observation noises in a fuzzy particle filter are considered as fuzzy variables by using the possibility theory, a fuzzy particle filter with fuzzy noises is used to manage uncertainty in various noise models. Also, we make possibility measure as using the fuzzy relation equation which is defined by these fuzzy variables. And then, the states are estimated by using a fuzzy expected value operator. Also, because the proposed algorithm applies several functions to improve the accuracy of tracking an object, the performance of tracking speed deteriorates. To resolve this problem to some extent, we consider the fact that a fuzzy particle filter has a little bit of an effect on the number of particles. Consequently, we propose the method which can adjust the number of particles by using the result from a measurement step in order to improve the speed for an object tracking in the proposed algorithm. The experiments of this paper show that the proposed method is efficient and has many advantages for an object tracking in real environments. © 2013 Elsevier Inc. All rights reserved.
Baek S.H.,Hyundai Engineering |
Pagilla K.R.,Illinois Institute of Technology |
Kim H.-J.,Suwon Science College
Biotechnology and Bioprocess Engineering | Year: 2010
Anaerobic bioreactors supplemented with membrane technology have become quite popular, owing to their favorable energy recovery characteristics. In this study, a lab-scale anaerobic Membrane Bioreactor (AnMBR) was assessed in experimental treatments of pre-settled dilute municipal wastewater obtained from a full-scaled wastewater treatment plant. The MBR system was operated in continuous flow mode for 440 days. To evaluate the performance of the AnMBR under various loading rates, the hydraulic retention time (HRT) was reduced in a stepwise manner (from 2 to 0.5 days). Afterward, the mixed liquor suspended solids (MLSS) were reduced from 7,000 to 3,000 mg/L in increments of 1,000 mg/L, resulting in a decrease in solids retention time (SRT) at a constant HRT of 1.0 day. The soluble chemical oxygen demand (SCOD) concentration in the feed varied between 38 and 131 mg/L, whereas the average permeate SCOD ranged between 18 and 37 mg/L, reflecting excellent effluent quality. The AnMBR performance in terms of COD removal proved stable, despite variations in influent characteristics and HRT and SRT changes. The concentration of extracellular polymeric substance (EPS) was reduced with decreases in HRT from 42 to 22 mg VS/mg of MLSS, thereby indicating that the increased biomass concentration biodegraded the EPS at lower HRTs. AnMBR is, therefore, demonstrably a feasible option for the treatment of dilute wastewater with separate stage nitrogen and phosphorus removal processes. © The Korean Society for Biotechnology and Bioengineering and Springer 2010.