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      • KCI우수등재

        A Measure of Agreement for Multivariate Interval Observations by Different Sets of Raters

        Um, Yong-Hwan Korean Data and Information Science Society 2004 한국데이터정보과학회지 Vol.15 No.4

        A new agreement measure for multivariate interval data by different sets of raters is proposed. The proposed approach builds on Um's multivariate extension of Cohen's kappa. The proposed measure is compared with corresponding earlier measures based on Berry and Mielke's approach and Janson and Olsson approach, respectively. Application of the proposed measure is exemplified using hypothetical data set.

      • KCI우수등재

        A Joint Agreement Measure Between Multiple Raters and One Standard

        Um, Yong-Hwan The Korean Data and Information Science Society 2005 한국데이터정보과학회지 Vol.16 No.3

        This article addresses the problem of measuring a joint agreement between multiple raters and a standard set of responses. A new agreement measure based on Um's approach is proposed. The proposed agreement measure is used for multivariate interval responses. Comparison is made between the proposed measure and other corresponding agreement measures using hypothetical data set.

      • KCI등재

        Comparative Study of the Temperature-dependent Dielectric Properties of Au/PPy/n-Si (MPS)-type Schottky Barrier Diodes

        Ahmet G¨um¨us¸,G¨ul¸cin Ers¨oz,˙Ibrahim Y¨uceda˘g,S¨umeyye Bayrakdar,S¸ emsettin Altındal 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.5

        The dielectric properties of Au/PPy/n-Si metal-polymer-semiconductor (MPS)-type Schottky barrier diodes (SBDs) were investigated by using capacitance-voltage (C-V ) and conductancevoltage (G/!-V ) measurements at various temperatures and voltages at frequencies of 100 kHz and 500 kHz. Both the real and the imaginary parts of the complex dielectric constant and dielectric loss ("0, "00) and of the electric modulus (M0, M00), as well as the conductivity (ac), were found to depend strongly on the temperature and the voltage. Both the C and G/! values increased with increasing applied voltage and had inversion, depletion, and accumulation regions as with a metal-insulator-semiconductor (MIS) type behavior. Both the dielectric constant ("0) and the dielectric loss ("00) increased with increasing temperature and decreased with increasing frequency. The loss tangent (tan ) vs. temperature curve had a peak at about 200 K for both frequencies. The M0 and the M00 values decreased with increasing temperature and became independent of the frequency at high temperatures. The series resistance (Rs) of the diode decreased with increasing temperature for the two frequencies while the ac increased. Such behaviors of the dielectric properties with temperature were attributed to the restructuring and reordering of charges at interface states/traps due to the varying temperature, the interfacial polarization, and the interfacial polymer layer. ln(ac) vs. q/kT plots had two distinct linear regions with different slopes for the two frequencies. Such behaviors of these plots confirmed the existence of two different conduction mechanisms corresponding to low and high temperatures. The values of the activation energy (Ea) were obtained from the slopes of these plots, and its value at low temperatures was considerably lower than that at high temperatures.

      • SCOPUSKCI등재

        Chinese hamster 난소세포에서 DNA - 단백질 교차결합과 glutathione S - 전이효소의 발현에 대한 돌연변이원에 의해 유도된 교차적응반응

        이동욱,엄경일,오규선,장정현,문용석 한국유전학회 2001 Genes & Genomics Vol.23 No.2

        The present study has been undertaken to elucidate whether glutathione S-transferase (GST) is related to cross-adaptive response to DNA-protein crosslink (DPC) induced by ethyl methanesulfonate (EMS) or ultraviolet radiation (UV)-C in Chinese hamster ovary (CHO) cells. DPC was determined by SDS-K^+ precipitation method, and GST was measured by western blot analysis. 2,4-Dinitrophenol (DNP) that depletes cellular ATP and cycloheximide (CHM) that inhibits protein synthesis were used to find whether DNP and CHM affected the expression level of GST and cross-adaptive response to EMS or UV. There is a cross-adaptive response to DPC in cells pretreated with EMS or UV and subsequently treated with UV or EMS, respectively. In cells pretreated with 2 mM EMS and subsequently treated with 5J/㎡ UV, DNP and CHM did not affect cross-adaptive response to DPC and GST. And also, in cells pretreated with 1J/㎡ UV and subsequently treated with 8 mM EMS, CHM did not affect crass-adaptive response to DPC and the expression level of GST. But DNP increased the amount of DPC, and decreased the expression level of GST in UV-pretreated cells. These results suggest that GST are involved in the induction of cross-adaptive response to DPC in CHO cells.

      • 특발성 과호산구 증후군 2예

        김은순,엄태현,김준희,신보문,김예희 인제대학교 1999 仁濟醫學 Vol.20 No.1S

        특발성 과호산구 증후군은 지속적인 호산구의 과도 생산으로 여러 장기에 손상을 가져오는 백혈구 증가 질환이다. 가장 많이 침범 되는 장기인 심장의 침범여부가 이환율과 생존율의 중요한 요인이다. 폐 침범은 약 40%에서 나타나며 만성, 지속성, 비객담성 기침이 주된 증상이다. 치료는 스테로이드를 투여하는 것인데 스테로이드에 반응하지 않은 경우 세포 독성 약제를 이차적으로 사용할 수 있다. 저자들은 폐를 침범한 특발성 과호산구성 증후군에서 스테로이드에 반응하지 않아 세포독성 약제 및 면역 억제제로 증상의 호전이 있었던 1예와 심장을 침범한 특발성 과호산구성 증후군으로 스테로이드에 반응한 1예를 경험하였기에 보고하는 바이다. The idiopathic hypereosinophilic syndrome is a leukoproliferative disorder marked by a sustained overproduction of eosinophilia with evidence of organ involvement. In patients with organ involvement, initial therapy is prednisone. Cytotoxic agents have been used in patients who are not responsive to corticosteroid. We experienced a 40-year-old woman with lung in volvement who was treated with cytarabine, azathioprine, prednisolone and a 46-year-old man with heart failure who showed partial response.

      • KCI등재후보

        단량체 및 무기질 filler 조성 변화에 따른 복합레진의 유변학적 특성

        이인복,이종혁,조병훈,손호현,이상탁,엄정문 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.6

        Objectives. The aim of this study was to investigate the effect of monomer and filler compositions on the rheological properties related to the handling characteristics of resin composites. Methods. Resin matrices that Bis-GMA as base monomer was blended with TEGDMA as diluent at various ratio were mixed with the Barium glass (0.7 um and 1.0 um), 0.04 um fumed silica and 0.5 um round silica. All used fillers were silane treated. In order to vary the viscosity of experimental composites, the type and content of incorporated fillers were changed. Using a rheometer, a steady shear test and a dynamic oscillatory shear test were used to evaluate the viscosity (η) of resin matrix, and the storage shear modulus (G′), the loss shear modulus (G″), the loss tangent (tanδ) and the complex viscosity (η*) of the composites as a function of frequency ω= 0.1-100 rad/s. To investigate the effect of temperature on the viscosity of composites, a temperature sweep test was also undertaken. Results. Resin matrices were Newtonian fluid regardless of diluent concentration and all experimental composites exhibited pseudoplastic behavior with increasing shear rate. The viscosity of composites was exponentially increased with increasing filler volume%. In the same filler volume, the smaller the fillers were used, the higher the viscosities were. The effect of filler size on the viscosity was increased with increasing filler content. Increasing filler content reduced tanδby increasing the G′further than the G″. The viscosity of composites was decreased exponentially with increasing temperature.

      • KCI우수등재

        On Assessing Inter-observer Agreement Independent of Variables' Measuring Units

        Um, Yong-Hwan Korean Data and Information Science Society 2006 한국데이터정보과학회지 Vol.17 No.2

        Investigators use either Euclidean distance or volume of a simplex defined composed of data points as agreement index to measure chance-corrected agreement among observers for multivariate interval data. The agreement coefficient proposed by Um(2004) is based on a volume of a simplex and does not depend on the variables' measuring units. We consider a comparison of Um(2004)'s agreement coefficient with others based on two unit-free distance measures, Pearson distance and Mahalanobis distance. Comparison among them is made using hypothetical data set.

      • SCIE

        Search Design of Resolution III.3 for $3^4$Factorial

        Um, Jung-Koog 韓國統計學會 1990 Journal of the Korean Statistical Society Vol.19 No.1

        The basic conditions for a parallel flats fraction to be a search design of resolution III.2 have been developed in Um (1980, 1981, 1983, 1984). A series of resolution III.2 search design for $3^n, n=4, 5, 6$ are presented in Um (1988). In this paper a resoultion III.3 search design for $3^4$ is presented.

      • KCI등재
      • SCOPUSKCI등재

        Kinetic Study on Nucleophilic Displacement Reactions of 2-Chloro-4-Nitrophenyl X-Substituted-Benzoates with Primary Amines: Reaction Mechanism and Origin of the α-Effect

        Um, Tae-Il,Kim, Min-Young,Kim, Tae-Eun,Um, Ik-Hwan Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.2

        The ${\alpha}$-Effect; Ground state; Transition state; Intramolecular H-bonding; Yukawa-Tsuno plot; Second-order rate constants for aminolysis of 2-chloro-4-nitrophenyl X-substituted-benzoates (1a-h) have been measured spectrophotometrically in 80 mol % $H_2O/20$ mol % DMSO at $25.0^{\circ}C$. The Br${\emptyset}$nsted-type plot for the reactions of 2-chloro-4-nitrophenyl benzoate (1d) with a series of primary amines curves downward, which has been taken as evidence for a stepwise mechanism with a change in rate-determining step (RDS). The Hammett plots for the reactions of 1a-h with hydrazine and glycylglycine are nonlinear while the Yukawa-Tsuno plots exhibit excellent linearity with ${\rho}_X=1.22-1.35$ and ${\gamma}= 0.57-0.59$, indicating that the nonlinear Hammett plots are not due to a change in RDS but are caused by stabilization of substrates possessing an electron-donating group (EDG) through resonance interactions between the EDG and C=O bond of the substrates. The ${\alpha}$-effect exhibited by hydrazine increases as the substituent X changes from a strong EDG to a strong electron-withdrawing group (EWG). It has been concluded that destabilization of hydrazine through the electronic repulsion between the adjacent nonbonding electrons is not solely responsible for the substituent dependent ${\alpha}$-effect but stabilization of the transition state is also a plausible origin of the ${\alpha}$-effect.

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