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Effects of Conditions of Generation and Degree of Task Difficulty in Children's Recall (생성 조건과 과제의 난이도가 아동의 회상에 미치는 영향)

  • Kim, Jung Eun;Choi, Kyoung Sook
    • Korean Journal of Child Studies
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    • v.23 no.6
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    • pp.33-47
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    • 2002
  • This study examined the effects of conditions of generation(0, 1, or 2 cognitive operations) and task difficulty in children's recall. Subjects were 40 children in each age group, 8-year-olds and 10-year-olds. Each subject was shown 12 simple or difficult multiplication problems in one of the conditions of generation. After a buffer task, subjects were required to recall correct answers to the problems in random order. The data were analyzed by ANOVA and simple main effect analyses. Results showed that generation effect(GE) occurred among children younger than 12, and GE improved with age. Learning from cognitive operations was more effective than learning through simple repetition. Easier tasks led to greater GE, a phenomenon explained by procedures used in this study.

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A Simple and Analytical Design Approach for Input Power Matched On-chip CMOS LNA

  • Kim, Tae-Wook;Lee, Kwyro
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.2 no.1
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    • pp.19-29
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    • 2002
  • A simple and analytical design approach for input power matched CMOS RF LNA circuits and their scaling for lower power consumption, is introduced. In spite of the simplicity of our expressions, it gives excellent agreement with numerical simulation results using commercial CAD tools for several circuit examples performed at 2.4GHz using $0.18\mu\textrm{m}$ CMOS technology. These simple and analytical results are extremely useful in that they can provide enough insights not only for designing any CMOS LNA circuits, but also for characterizing and diagnosing them whether being prototyped or manufactured.

A Simple Method for Testing Freezing Resistance Based on Chlorophyll Fluorescence in Tea (Camellia sinensis L.)

  • Chun, Jong-Un;Jeong, In-Ho;Choi, Hyoung-Kog
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.45 no.5
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    • pp.322-327
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    • 2000
  • For the stable production of high quality tea, the freezing resistance is a very important character. Most of the farmers have planted out-pollinated seeds that are not genetically pure. So, with small sample, a quick and simple method is required to test freezing resistance of lots of germ-plasm and early generation of hybrids. The absorbances(A530 nm) of TTC reduction solution at -5$^{\circ}C$ were positively correlated with resistance to photoinhibition of PSII in 6 hour photoinhibitory treatments, being significantly fitted by simple linear regression ($R^2$=${0.64}^{**}$). Chlorophyll fluorescence measured by Fv/Fm was found to be very useful in evaluating the relative levels of freezing resistance in tea.

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SKEW CONSTACYCLIC CODES OVER FINITE COMMUTATIVE SEMI-SIMPLE RINGS

  • Dinh, Hai Q.;Nguyen, Bac Trong;Sriboonchitta, Songsak
    • Bulletin of the Korean Mathematical Society
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    • v.56 no.2
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    • pp.419-437
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    • 2019
  • This paper investigates skew ${\Theta}-{\lambda}$-constacyclic codes over $R=F_0{\oplus}F_1{\oplus}{\cdots}{\oplus}F_{k-1}$, where $F{_i}^{\prime}s$ are finite fields. The structures of skew ${\lambda}$-constacyclic codes over finite commutative semi-simple rings and their duals are provided. Moreover, skew ${\lambda}$-constacyclic codes of arbitrary length are studied under a new definition. We also show that a skew cyclic code of arbitrary length over finite commutative semi-simple rings is equivalent to either a cyclic code over R or a quasi-cyclic code over R.

Experimental study on the effects of stern bulb arrangement on the slamming load

  • Park, Jongyeol;Choi, Ju Hyuck;Lee, Hyun-ho;Rhee, Shin Hyung
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.12 no.1
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    • pp.518-530
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    • 2020
  • The present study concerns the stern slamming load of container carriers, with stern bulb arrangement variation. First, a series of wedge drop tests were conducted using simple wedge models with fixed deadrise angles, and tests with the cross-section models of practical container carrier sterns were followed. The deadrise angle of the simple wedge ranged from 0° to 10°. The pressure measurement results of the simple wedge drop tests were distributed between empirical formula and analytic solution, so the experimental setup was validated. In the cases of practical hull cross-sections, the water entry of the bulb prior to that of the transom resulted in characteristic water film generation and delayed pressure peak appearance. The trapped air between the bulbs damped the pressure in the twin skeg hull case, reducing the pressure peak and causing the pressure oscillation during water entry.

SIMPLE ZEROS OF L-FUNCTIONS AND THE WEYL-TYPE SUBCONVEXITY

  • Peter Jaehyun Cho;Gyeongwon Oh
    • Journal of the Korean Mathematical Society
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    • v.60 no.1
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    • pp.167-193
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    • 2023
  • Let f be a self-dual primitive Maass or modular forms for level 4. For such a form f, we define Nsf(T):=|{ρ ∈ ℂ : |𝕵(ρ)| ≤ T, ρ is a non-trivial simple zero of Lf(s)}|.. We establish an omega result for Nsf(T), which is $N^s_f(T) = \Omega(T^{\frac{1}{6}-{\epsilon}})$ for any ∊ > 0. For this purpose, we need to establish the Weyl-type subconvexity for L-functions attached to primitive Maass forms by following a recent work of Aggarwal, Holowinsky, Lin, and Qi.

The Concentrations of PCBs in the Serum and Theri Predictors of Exposure n Korean Women (일부 한국 성인 여성들의 혈중 PCBs 농도 및 그 노출요인의 연구)

  • 민선영;정문호;이강숙;노영만;구정환
    • Journal of Environmental Health Sciences
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    • v.26 no.2
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    • pp.97-107
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    • 2000
  • PCBs [Polychlorinated biphenyls] are halogenated aromatic compounds with the empirical formula C12H10-nCln(n=1~10), and are a mixture of possible 209 different chlorinated congeners. PCBs were widely used as dielectric fluids for capacitors, transformers, plasticizers, lubricant inks, and paint additives. once released into the environment, PCBs persist for years because they are so resistant to degradation. In addition to their high degree of lipophilicity. In 1970s, the worldwide production of PCBs seem to be still in use. The environmental load of PCBs was prohibited since 1983 in Korea. In spite of these actions, many PCBs seem to be still in use. The environmental load of PCBs will continue to be recycled through air, land, water, and the biosphere for decades to come. This study was conducted to measure the concentrations of PCBs I the serum samples of 112 women by GC/MSD(Hewlett Packard 5897 Gas Chromatography-Mass Chromatography Detector) and CG/ECD(Hewlett Packard 5890 series-II gas chromatography-Electron capture detector, U.S.A). The main results of this study were as follows; The mean and standard deviation of serum PCBs were 3.613, 0.759 ppb, respectively and median of it was 3.828 ppb. The correlation coefficients of the concentrations of 13 PCB congeners ranged from 0.7913 to 0..9985 and were significantly correlated between each items(p=0.0001). The PCB concentrations were positively associated with age(simple linear regression; R2=0.86, =0.08023, p<0.001) and with total lipids in serums(simple linear regression; R=0.7058, =0.00486, p<0.001). The age adjusted model (Y=$\beta$0+$\beta$1age+$\beta$2X) was applied for possible predictors of PCBs levels in serum. For BMI(Body Mass Index), major residential area, and fish, meat, and dairy consumption, there was no association with PCBs levels, Also there was negative association for the number of pregnancy and lactation period with PCBs levels.

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Empirical Correlation for the Estimation of Resilient Modulus of Cohesive Soils (점성토의 회복탄성계수 추정을 위한 경험식)

  • 이우진
    • Proceedings of the Korean Geotechical Society Conference
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    • 1994.09a
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    • pp.259-264
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    • 1994
  • The 1986 AASHTO Guide for the Design of Pavement Structures introduced the resilient modulus as a definitive material property to characterize roadbed soil. Although the incorporation of resilient modulus represents a significant acvance in pavement design practice, the test procedure for resilient modulus is complicated and time-consuming. Therefore, it is necessary to develop data base of resilient modulus for the soils frequently encountered; and to develop the reliable correlations between resilient properties and parameters from simple routine tests, In this study, resilient modulus tests were performed on five cohesive soils sampled from in-service subgrades. The stress at 1 percent axial strain in unconfined compression test(su1.0%) was found as a good indicator of the resilient modulus, and unique relationship between Mg and Su1.0% was obtained. A simple chart to estimate the resilient modulus at different levels of confining stress and deviator stress was also developed.

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Formation of Niobium Oxide Film with Duplex Layers by Galvanostatic Anodization

  • Kim, Hyun-Kee;Yoo, Jeong-Eun;Park, Ji-Young;Seo, Eul-Won;Choi, Jin-Sub
    • Bulletin of the Korean Chemical Society
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    • v.33 no.8
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    • pp.2675-2678
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    • 2012
  • Studies on niobium anodization in the mixture of 1 M $H_3PO_4$ and 1 wt % HF at galvanostatic anodization are described here in detail. Interestingly, duplex niobium oxide consisting of thick barrier oxide and correspondingly thick porous oxide was prepared at a constant current density of higher than 0.3 $mAcm^{-2}$, whereas simple porous type oxide was formed at a current density of lower than 0.3 $mAcm^{-2}$. In addition, simple barrier or porous type oxide was obtained by galvanostatic anodization at a single electrolyte of either 1 M $H_3PO_4$ or 1 wt % HF, respectively. The formation mechanism of duplex type structures was ascribed to different forming voltages required for moving anions.

SPECTRAL DUALITIES OF MV-ALGEBRAS

  • Choe, Tae-Ho;Kim, Eun-Sup;Park, Young-Soo
    • Journal of the Korean Mathematical Society
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    • v.42 no.6
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    • pp.1111-1120
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    • 2005
  • Hong and Nel in [8] obtained a number of spectral dualities between a cartesian closed topological category X and a category of algebras of suitable type in X in accordance with the original formalism of Porst and Wischnewsky[12]. In this paper, there arises a dual adjointness S $\vdash$ C between the category X = Lim of limit spaces and that A of MV-algebras in X. We firstly show that the spectral duality: $S(A)^{op}{\simeq}C(X^{op})$ holds for the dualizing object K = I = [0,1] or K = 2 = {0, 1}. Secondly, we study a duality between the category of Tychonoff spaces and the category of semi-simple MV-algebras. Furthermore, it is shown that for any $X\;\in\;Lim\;(X\;{\neq}\;{\emptyset})\;C(X,\;I)$ is densely embedded into a cube $I^/H/$, where H is a set.