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Glasses removal from facial image using recursive error compensation
Park, Jeong-Seon,Oh, You Hwa,Ahn, Sang Chul,Lee, Seong-Whan IEEE Comput. Soc 2005 IEEE transactions on pattern analysis and machine Vol.27 No.5
In this paper, we propose a new method of removing glasses from a human frontal facial image. We first detect the regions occluded by the glasses and generate a natural looking facial image without glasses by recursive error compensation using PCA reconstruction. The resulting image has no trace of the glasses frame or of the reflection and shade caused by the glasses. The experimental results show that the proposed method provides an effective solution to the problem of glasses occlusion and we believe that this method can also be used to enhance the performance of face recognition systems.
Equilibria and Dynamics of Toluene and Trichloroethylene onto Activated Carbon Fiber
Park, Jee-Won,Lee, Young-Whan,Choi, Dae-Ki,Lee, Sang-Soon The Korean Society of Clean Technology 2002 청정기술 Vol.8 No.2
Adsorption dynamics for toluene and trichloroethylene with an isothermal fixed bed of activated carbon fiber were investigated. Equilibrium isotherms were measured by a static method for toluene and trichloroethylene onto activated carbon fiber at temperatures of 298, 323, and 348 K and pressure up to 3 kPa for toluene and 6 kPa for trichloroethylene, respectively. These results were correlated by the Toth equation. And dynamic experiments in an isothermal condition of 298 K were examined. Breakthrough curves reflected the effects of the experimental variables such as partial pressures for adsorbate and interstitial bulk velocities of gas flow. To present the column dynamics, a dynamic model based on the linear driving force (LDF) mass transfer model was applied.
Hybrid Self Organizing Map using Monte Carlo Computing
Sung-Hee Jun(전성해),Minjae Park(박민재),Kyung-Whan Oh(오경환) 한국지능시스템학회 2006 한국지능시스템학회 학술발표 논문집 Vol.16 No.1
Self Organizing Map(SOM) is a powerful neural network model for unsupervised learning. In many clustering works with exploratory data analysis, it has been popularly used. But it has a weakness which is the poorly theoretical base. A lot more researches for settling the problem have been published. Also, our paper proposes a method to overcome the drawback of SOM. As compared with the presented researches, our method has a different approach to solve the problem. So, a hybrid SOM is proposed in this paper. Using Monte Carlo computing, a hybrid SOM improves the performance of clustering. We verify the improved performance of a hybrid SOM according to the experimental results using UCI machine learning repository. In addition to, the number of clusters is determined by our hybrid SOM.
Park, Tai-Hyun,Yoon, Sung-Kwan,Kang, Whan-Koo The Korean Society for Biotechnology and Bioengine 1996 Biotechnology and Bioprocess Engineering Vol.1 No.1
An Exponetial feeding strategy has been frequently used in fed-batch fermentation of recombinant E. coli. In this feeding scheme, growth yield and initial cell concentration, which can be erroneously determined, are needed to calculate the feed rate for controlling specific growth rate at the set point. The effect of the incorrect growth yield and initial cell concentration on the control of the specific growth rate was theoretically analyzed. Insignificance of the correctness of those parameters for the control of the specific growth rate was shown theoretically and experimentally.
Trial of everolimus-eluting stents or bypass surgery for coronary disease.
Park, Seung-Jung,Ahn, Jung-Min,Kim, Young-Hak,Park, Duk-Woo,Yun, Sung-Cheol,Lee, Jong-Young,Kang, Soo-Jin,Lee, Seung-Whan,Lee, Cheol Whan,Park, Seong-Wook,Choo, Suk Jung,Chung, Cheol Hyun,Lee, Jae Won Massachusetts Medical Society 2015 The New England journal of medicine Vol.372 No.13
<P>Most trials comparing percutaneous coronary intervention (PCI) with coronary-artery bypass grafting (CABG) have not made use of second-generation drug-eluting stents.</P>
Amino Acid Sequence Homology of Hybrid Poplar O-methyltransferuse Involved in Lignin Biosynthesis
Park, Young-Goo,Sul, Ill-Whan,Shin, Dong-Ill,Park, Jang-Won,Park, Hee-Sung The Korean Society of Plant Biotechnology 2001 Plant molecular biology and biotechnology research Vol.3 No.3
In $\lambda$-Zap II vector system, a cDNA library was constructed for the developing secondary xylem mRNA from hybrid poplar, Populus nigra x maximowiczii. A cDNA clone of 1.5 kb in size, pOMTB1.4 encoding a lignin-bispecific O-methyltransferase was screened by plaque hybridization using a probe of 540 bp cDNA amplified by polymerase chain reaction from the cDNA library and identified by nucleotide sequencing. Its nucleotide sequence contains one open reading frame of 366 amino acids. The deduced amino acid sequence in comparison with that of Populus tremuloides showed the differences of 9 amino acids and revealed 85-99% homology among alfalfa, poplar and aspen.
Park, Kyu-Sang,Kong, In-Deok,Lee, Joong-Woo,Rhim, Hye-Whon,Kim, Young-Chul,So, In-Suk,Kim, Ki-Whan The Korean Society of Pharmacology 2002 The Korean Journal of Physiology & Pharmacology Vol.6 No.5
The effects of intracellular and extracellular pH on the inwardly rectifying $K^+$ (IRK) channel of the bovine aortic endothelial cells (BAECs) were examined using whole-cell patch-clamp technique. The IRK current, efficiently blocked by $Ba^{2+}\;(200{\mu}M),$ is the most prominent membrane current in BAECs, which mainly determines the resting membrane potential. The expression of Kir2.1 was observed in BAECs using reverse transcriptase-polymerase chain reaction (RT-PCR) analysis. Intracellular alkalinization, elicited by the extracellular substitution of NaCl with $NH_4Cl$ (30 mM), significantly augmented the amplitude of IRK current. On the contrary, the amplitude of IRK current was attenuated by the Na-acetate (30 mM)-induced intracellular acidification. The changes in extracellular pH also closely modulated the amplitude of IRK current, which was decreased to $40.2{\pm}1.3%$ of control upon switching the extracellular pH to 4.0 from 7.4. The extracellular pH value for half-maximal inhibition (pK) of IRK current was 5.11. These results demonstrate that the activity of IRK channel in BAECs, probably Kir2.1, was suppressed by proton at both sides of plasma membrane.