비율의 표시법과 세가지 용법

변낙문 한국수학교육학회 1966 수학교육 Vol.5 No.1

유자차 부산물을 이용한 유자 과편의 최적화 연구

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.

KFL learners’ acquisition of Korean locative particles : A corpus-based contrastive interlanguage analysis

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.

Poems and Essays

Pyun Yung-ro The Academy of Korean Studies 1965 Korea Journal Vol.5 No.5

AN OVERVIEW OF THE HEALTH INSURANCE DEMONSTRATION PROGRAMS IN KOREA

Moon, Ok Pyun,M. D. 대한보건협회 1977 대한보건연구 Vol.3 No.1

Resource Allocation Scheme for Multihop Cellular Networks Using Directional Transmission

Pyun, S. Y.,Lee, Woongsup,Cho, Dong-Ho Springer Science + Business Media 2017 Wireless personal communications Vol.94 No.4

<P>Multihop cellular networks offer a cost-effective solution to the problem of achieving higher capacity and extending coverage by using relay stations (RSs) deployed within the coverage area of a base station (BS). We herein consider directional transmission based on adaptive beamforming in which multiple users are served at the same time using multiple directional beams; this represents one promising technology that could improve the capacity of multihop cellular network. In directional transmission, severe intra-BS/RS, inter-BS-RS, and inter-RS interferences can occur due to the concurrent transmission and accordingly, system performance can be degraded severely. In this paper, we propose resource allocation to maximize the system capacity of multihop cellular networks by taking into account these severe interferences caused in multihop cellular network using directional transmission. To alleviate the problem of high computational complexity, we propose a sub-optimal scheme. A heuristic scheme is also proposed which can be performed in distributed manner with lower computational complexity. Through simulation results, we show that the use of our proposed schemes increases system capacity.</P>

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.

Quantitative estimation of reversibility of the discharge process undergone by nickel hydroxide film cathodically deposited on pure nickel as a positive supercapacitor electrode using cyclic voltammetry and potential drop method

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.

In vivo protective effects of dietary curcumin and capsaicin against alcohol-induced oxidative stress.

Pyun, Chang-Won,Kim, Ji-Han,Han, Kyu-Ho,Hong, Go-Eun,Lee, Chi-Ho Published for International Union of Biochemistry 2014 Biofactors Vol.40 No.5

<P>BALB/c mice were exposed to chronic alcohol-induced oxidative stress by intragastric administration of excessive ethanol (5 g/kg body weight) during the 24-week period. Curcumin (0.016%) or capsaicin (0.014%) containing diets were fed with or without ethanol treatment in four groups. There was no statistically significant difference in the behavioral test between all groups during the experimental period. Only one alcohol-treated mouse fed a normal diet showed a behavioral disorder and died before the raising period was completed. There were no effects on the activity of catalase and superoxide dismutase in the brain. However, curcumin or capsaicin treatment prevented alcohol-induced decline in brain weight. Furthermore, the levels of malondialdehyde and phosphatidylcholine hydroperoxide were significantly reduced in the brain tissue extract. The findings of this study demonstrated and confirmed the antioxidant effect of curcumin and capsaicin against alcohol-induced oxidative stress, and they suggest a direction for further studies.</P>

Paraproteinemic neuropathy

Pyun, So Young,Kim, Byung-Jo The Korean Society of Clinical Neurophysiology 2017 Annals of Clinical Neurophysiology Vol.19 No.2

Paraproteinemia is caused by a proliferation of monoclonal plasma cells or B lymphocytes. Approximately 10% of idiopathic neuropathies are associated with paraproteinemia, where a certain paraprotein acts like an antibody targeted at constituents of myelin or axolemma in peripheral nerves. The relationship between paraproteinemia and peripheral neuropathy remains unclear despite this being of interest for a long time. Neurologists frequently find paraproteinemia during laboratory examinations of patients presenting with peripheral neuropathy, especially in the elderly. The possibility of a relationship with paraproteinemia should be considered in cases without an explainable cause. We review the causal association between paraproteinemia and neuropathy as well as clinical, laboratory, and electrophysiologic features, and the treatment options for paraproteinemic neuropathy.