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남혜원,현영희,변진원 동아시아식생활학회 2004 동아시아식생활학회지 Vol.14 No.6
This study was performed to develop a standardized recipe for yuza pyun made of citron juice that is by-product of citron tea, to increase the utilization of citron. The effects of mungbean starch(15%, 18%) and dilution ratio of yuza extract(100%, 75%, 50%) on the quality characteristics were evaluated. The quality characteristics of the samples were estimated in terms of sweetness, color difference, texture profile analysis and sensory evaluation. Sweetness of the 18% mungbean groups were higher than 15% groups(p<0.001). The values of Hunter color system indicated that higher content of yuza extract tended to increase yellowness significantly(p<0.001). Texture profiles of hardness, adhesiveness, springiness, cohesiveness, gumminess of yuzapyun showed no significant differences among samples. For sensory evaluation, color and sourness were decreased as yuza extract was diluted, whereas elasticity and sweetness were increased. Yuza pyun containing 18% of mungbean starch with 50% diluted extract was the most preferred in overall acceptability. According to multiple regression analysis, color, sweetness, elasticity and sourness(in order) were important control factors in overall acceptability.
Danielle Ooyoung Pyun,Miri K. Chung,Ho Jung Choi 고려대학교 언어정보연구소 2013 언어정보 Vol.17 No.-
Pyun, Danielle O., Chung, Miri K. & Choi, Ho Jung. 2013. KFL learners’ acquisition of Korean locative particles: A corpus-based contrastive interlanguage analysis. Language Information. Volume 17. 23-46. Adopting the contrastive interlanguage analysis methodology, this study investigates KFL (Korean as a Foreign Language) learners’ acquisition of Korean locative case particles. A learner corpus compiled from eighty-seven intermediate learners of Korean was compared with a native speaker corpus on the frequency distribution of the five semantic categories of the Korean locative case (i.e, static location, dynamic location, time, goal, and source). In addition, learner errors on the use of locative case particles were quantified and examined according to the five semantic categories. The results of this study showed that KFL learners’ use of locative case particles substantially deviated from native speakers’ usage in frequency. Learners’ inaccurate and limited use of locative case particles were attributed to such factors as L1 transfer, overgeneralization, prior input, and interlanguage development.
Pyun Su-Il,Moon Sung-Mo The Korean Electrochemical Society 1998 한국전기화학회지 Vol.1 No.1
This work presents the way how to evaluate the degree of reversibility of the discharging process undergone by the nickel hydroxide film cathodically deposited on pure nickel as a positive electrode for electrochemical capacitor using the combined cyclic voltammetry and potential drop method, supplemented by galvanostatic discharge and open-circuit potential transient methods. The time interval necessary just to establish the current reversal of anodic to cathodic direction from the moment just after applying the potential inversion of anodic to cathodic direction, was obtained on cyclic voltammogram. The cathodic charge density passed upon dropping the applied potential, was calculated on potentiostatic current density-time curve. Both the time interval and the cathodic charge density in magnitude can be regarded as being measures of the degree of reversibility of the discharging process undergone by the positive active material for supercapacitor, i.e. , the longer the time interval is, the lower is the degree of reversibility and the greater the cathodic charge density is, the higher is the degree of reversibility. From the applied potential dependences of the time interval and cathodic charge density, discharge at $0.42 V_{SCE}$ was determined to be the most reversible.
Pyun, Y.S,Jang, Y.D.,Cho, I.H.,Park, J.H.,Combs, A.,Lee, Y.C. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.7
A No Spin Differential (NSD) design has been improved from evaluation of two NSD models utilizing the axiomatic approach. New design parameters of the second level are developed to satisfy the independence axiom. The design matrices are determined to decouple the relationship between design parameters and process parameters. The values of process parameters are then determined to optimize and improve the NSD design. Consequently a unique and evolutionary NSD design is achieved with the aid of the axiomatic approach.
Pyun Jung-Hoon,Ahn Byeong-Yun,Vuong Tuan Anh,Kim Su Woo,조윤주,Jeon Jaehyung,Baek Seung Ho,Kim Jaewon,Park Sungsu,배규운,Choi Jun-Hyuk,Kim Jae-Ryong,Ryu Dongryeol,Lee Sang-Jin,강종순 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Vascular smooth muscle cells (VSMCs) have remarkable plasticity in response to diverse environmental cues. Although these cells are versatile, chronic stress can trigger VSMC dysfunction, which ultimately leads to vascular diseases such as aortic aneurysm and atherosclerosis. Protein arginine methyltransferase 1 (Prmt1) is a major enzyme catalyzing asymmetric arginine dimethylation of proteins that are sources of asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase. Although a potential role of Prmt1 in vascular pathogenesis has been proposed, its role in vascular function has yet to be clarified. Here, we investigated the role and underlying mechanism of Prmt1 in vascular smooth muscle contractility and function. The expression of PRMT1 and contractile-related genes was significantly decreased in the aortas of elderly humans and patients with aortic aneurysms. Mice with VSMC-specific Prmt1 ablation (smKO) exhibited partial lethality, low blood pressure and aortic dilation. The Prmt1-ablated aortas showed aortic dissection with elastic fiber degeneration and cell death. Ex vivo and in vitro analyses indicated that Prmt1 ablation significantly decreased the contractility of the aorta and traction forces of VSMCs. Prmt1 ablation downregulated the expression of contractile genes such as myocardin while upregulating the expression of synthetic genes, thus causing the contractile to synthetic phenotypic switch of VSMCs. In addition, mechanistic studies demonstrated that Prmt1 directly regulates myocardin gene activation by modulating epigenetic histone modifications in the myocardin promoter region. Thus, our study demonstrates that VSMC Prmt1 is essential for vascular homeostasis and that its ablation causes aortic dilation/dissection through impaired myocardin expression.
Lithium intercalation into a plasma-enhanced-chemical-vapour-deposited carbon film electrode
Pyun Su-II The Korean Electrochemical Society 1999 한국전기화학회지 Vol.2 No.1
Electrochemical lithium intercalation into a PECVD (plasma enhanced chemical vapour deposited) carbon film electrode was investigated in 1 M $LiPF_6-EC$ (ethylene carbonate) and DEC (diethyl carbonate) solution during lithium intercalation and deintercalation, by using cyclic voltammetry supplemented with ac-impedance spectroscopy. The size of the graphitic crystallite in the a- and c-axis directions obtained from the carbon film electrode was much smaller than those of the graphite one, indicating less-developed crystalline structure with hydrogen bonded to carbon, from the results of AES (Auger electron spectroscopy), powder XRD (X-ray diffraction) method, and FTIR(Fourier transform infra-red) spectroscopy. It was shown from the cyclic voltammograms and ac-impedance spectra of carbon film electrode that a threshold overpotential was needed to overcome an activation barrier to entrance of lithium into the carbon film electrode, such as the poor crystalline structure of the carbon film electrode showing disordered carbon and the presence of residual hydrogen in its structure. The experimental results were discussed in terms of the effect of host carbon structure on the lithium intercalation capability.