• Korean Journal of Mathematics
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• v.30 no.3
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• pp.467-474
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• 2022

In this article, we consider the integral operator 𝓒^b,c, which is defined as follows: $${\mathcal{C}}^{b,c}(f)(z)={\displaystyle\smashmargin{2}{\int\nolimits_{0}}^z}{\frac{f(w)*F(1,1;c;w)}{w(1-w)^{b+1-c}}}dw,$$ where * denotes the Hadamard/ convolution product of power series, F(a, b; c; z) is the classical hypergeometric function with b, c > 0, b + 1 > c and f(0) = 0. We investigate the boundedness of the 𝓒^b,c operators on Bloch spaces.

• Bulletin of the Korean Mathematical Society
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• v.60 no.2
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• pp.281-291
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• 2023

A normalized analytic function f is parabolic starlike if w(z) := zf' (z)/f(z) maps the unit disk into the parabolic region {w : Re w > |w - 1|}. Sharp estimates on the third Hermitian-Toeplitz determinant are obtained for parabolic starlike functions. In addition, upper bounds on the third Hankel determinants are also determined.

• Journal of Astronomy and Space Sciences
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• v.22 no.2
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• pp.147-174
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• 2005

To understand the physical processes that control the high-latitude lower thermospheric dynamics, we quantify the forces that are mainly responsible for maintaining the high-latitude lower thermospheric wind system with the aid of the National Center for Atmospheric Research Thermosphere-Ionosphere Electrodynamics General Circulation Model (NCAR-TIEGCM). Momentum forcing is statistically analyzed in magnetic coordinates, and its behavior with respect to the magnitude and orientation of the interplanetary magnetic field (IMF) is further examined. By subtracting the values with zero IMF from those with non-zero IMF, we obtained the difference winds and forces in the high-latitude 1ower thermosphere(<180 km). They show a simple structure over the polar cap and auroral regions for positive($B_y$ > 0.8|$\overline{B}_z$ |) or negative($B_y$ < -0.8|$\overline{B}_z$|) IMF-$\overline{B}_y$ conditions, with maximum values appearing around -80$^{\circ}$ magnetic latitude. Difference winds and difference forces for negative and positive $\overline{B}_y$ have an opposite sign and similar strength each other. For positive($B_z$ > 0.3125|$\overline{B}_y$|) or negative($B_z$ < -0.3125|$\overline{B}_y$|) IMF-$\overline{B}_z$ conditions the difference winds and difference forces are noted to subauroral latitudes. Difference winds and difference forces for negative $\overline{B}_z$ have an opposite sign to positive $\overline{B}_z$ condition. Those for negative $\overline{B}_z$ are stronger than those for positive indicating that negative $\overline{B}_z$ has a stronger effect on the winds and momentum forces than does positive $\overline{B}_z$ At higher altitudes(>125 km) the primary forces that determine the variations of tile neutral winds are the pressure gradient, Coriolis and rotational Pedersen ion drag forces; however, at various locations and times significant contributions can be made by the horizontal advection force. On the other hand, at lower altitudes(108-125 km) the pressure gradient, Coriolis and non-rotational Hall ion drag forces determine the variations of the neutral winds. At lower altitudes(<108 km) it tends to generate a geostrophic motion with the balance between the pressure gradient and Coriolis forces. The northward component of IMF By-dependent average momentum forces act more significantly on the neutral motion except for the ion drag. At lower altitudes(108-425 km) for negative IMF-$\overline{B}_y$ condition the ion drag force tends to generate a warm clockwise circulation with downward vertical motion associated with the adiabatic compress heating in the polar cap region. For positive IMF-$\overline{B}_y$ condition it tends to generate a cold anticlockwise circulation with upward vertical motion associated with the adiabatic expansion cooling in the polar cap region. For negative IMF-$\overline{B}_z$ the ion drag force tends to generate a cold anticlockwise circulation with upward vertical motion in the dawn sector. For positive IMF-$\overline{B}_z$ it tends to generate a warm clockwise circulation with downward vertical motion in the dawn sector.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.38 no.4
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• pp.293-299
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• 2002

The anchovy scoop net fishery is one of the important in the South sea and coastal of Jeju of Korea. They are using incandescent lamp as a fishing lamp at night to gather anchovy shoals in the water surface. Fishing lamp (AC 100 V 500 W$\times$2~3 or AC 100 V 1 ㎾$\times$1) was installed at 1 m ahead of the prow and 1.5 m height from the water surface. The fishing lamp let anchovy shoals rise to the water surface and are attracted to bag net. On this study, the distribution of submarine illumination of 1㎾ and 2 ㎾ incandescent lamp were analyzed and discussed to investigate the ability of fishing lamp which can gather anchovy shoals effectively. The submarine illumination of incandescent lamp showed peak in wave length 690 nm. The relationship between submarine illumination (L) and water depth (Z) of 1 ㎾ and 2 ㎾ incandescent lamp in vertical light is 1 ㎾ : L = 3851. 9 $e^{-1.4587Z}$ $R^2$=0.9952 2 ㎾ : L= 8211.9 $e^{-1.2852Z}$ $R^2$=0.9977 The submarine illumination of 2 ㎾ incandescent lamp of 0～4 m layers appeared to be 3 to 4 times higher than 1 ㎾ incandescent lamp, and in more deep layers than 6 m appeared to be equal value of each lamp. The light of incandescent lamp (1 ㎾) pass through much better into vertical direction than horizontal, and submarine illumination of 20 m layers was 1.0 l$\chi$. Therefore, fishing lamp power is thought that 1 ㎾ incandescent lamp is more efficient than 2 ㎾ to gather anchovy shoals in depth of 15~20 m to water surface.

• Korean Journal of Environmental Biology
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• v.18 no.3
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• pp.307-313
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• 2000

Aromatic hydrocarbons are known to be recalcitrant, so that they have been concerned as pollutant chemicals. Microorganisms play a major role in the breakdown and mineralization of these compounds. However, the kinetics of the biodegradation process may be much slower than desired from environmental consideration. The biodegradation of aromatic hydrocarbons is conducted by oxidation to produce catechol as a common intermediate which is metabolized for carbon and energy sources. In this study, a bacterial isolate capable of degrading several aromatic hydrocarbons was isolated from the contaminated wastewater of Yeocheon industrial complex. On the basis of biochemical characteristics and major cellular fatty acids, the isolate was identified as Pseudomonas putida Z104. The strain Z104 can utilize benzoate and catechol as the sole carbon and energy sources via a serial degradative pathway. The strain degraded actively 0.5 mM catechol in MM2 medium at pH 7.0 and 3$0^{\circ}C$.

• The Journal of Korean Academic Society of Nursing Education
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• v.17 no.1
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• pp.14-24
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• 2011

Purpose: The purpose of this study was to investigate the learning effect of a standardized patient managed instruction program for a clinical maternity nursing course. Methods: The SP managed instruction was made for clinical cases in intrapartum and postpartum nursing care. The SP managed instruction was evaluated by using a quasi-experimental, nonequivalent control group post-test design with separate classes of students attending clinical maternity nursing classes at a nursing school in Incheon. Control groups were taught by traditional lecture/model method and experimental groups were taught by SP managed instruction. Data was collected from September 2009 to February 2010. Results: 1. There was no significant difference between the experimental group and control group in identifying relevant data (z=-1.418, p=.156) and necessary nursing skills performance (z=-.643, p=.520) for intrapartum nursing care. In addition, there was no significant difference between the two groups in identifying relevant data (z=-.264, p=.782) and necessary nursing skill (z=-.342, p=.732) for postpartum nursing care. 2. In clinical nursing skill performances the total score was statistically significantly higher in the experimental group than the control group (intrapartum care z=-4.181, p=.000, postpartum care z=-4.279, p=.000). 3. There was a statistically significant difference between the two groups (intrapartum care z=-3.731, p=.000, postpartum care z=-4.066, p=.000). Conclusion: In conclusion, the SP methodis effective in teaching clinical maternity nursing for student nurses and it is necessary to develop SP instruction courses for many areas in the clinical nursing education field.

• Journal of Environmental Science International
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• v.29 no.12
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• pp.1261-1274
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• 2020

The characteristics of ammonia-nitrogen (NH4+-N) adsorption by a zeolitic material synthesized from Jeju scoria using the fusion and hydrothermal method was studied. The synthetic zeolitic material (Z-SA) was identified as a Na-A zeolite by X-ray diffraction, X-ray fluorescence analysis and scanning electron microscopy images. The adsorption of NH4+-N using Jeju scoria and different types of zeolite such as the Z-SA, natural zeolite, and commercial pure zeolite (Na-A zeolite, Z-CS) was compared. The equilibrium of NH4+-N adsorption was reached within 30 min for Z-SA and Z-CS, and after 60 min for Jeju scoria and natural zeolite. The adsorption capacity of NH4+-N increased with approaching to neutral when pH was in the range of 3-7, but decreased above 7. The removal efficiency of NH4+-N increased with increasing Z-SA dosage, however, its adsorption capacity decreased. For initial NH4+-N concentrations of 10-200 mg/L at pH 7, the adsorption rate of NH4+-N was well described by the pseudo second-order kinetic model than the pseudo first-order kinetic model. The adsorption isotherm was well fitted by the Langmuir model. The maximum uptake of NH4+-N obtained from the Langmuir model decreased in the order of Z-CS (46.8 mg/g) > Z-SA (31.3 mg/g) > natural zeolite (5.6 mg/g) > Jeju scoria (0.2 mg/g).

• Journal of muscle and joint health
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• v.19 no.2
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• pp.210-222
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• 2012

Purpose: This study examined the effects of taekwondo exercise program on the physical function, fitness and quality of life in women with osteoarthritis. Methods: With nonequivalent control group quasi-experimental design, 17 outpatients with osteoarthritis were recruited from June to August, 2010. The subjects were divided into 14 in experimental group and 13 in control group. The taekwondo exercise program was consisted of public taekwondo gymnastics with stretching movement and carried out every 60 minutes, 2 times a week for 12 weeks. Physical fitness of sit up, sit and reach, and agility, KWOMAC, and quality of life were measured. Data were analyzed by t-test and Mann-Whitney test using SPSS program. Results: After the intervention, the physical fitness for muscle endurance (Z=-4.40, p<.001), flexibility (Z=-2.75, p=.006), and agility (Z=-1.95, p=.050) were significantly improved in the experimental group. The mean scores of KWOMAC in the experimental group were significantly decreased (Z=-2.94, p=.003) and the mean difference of quality of life in the experimental group was also significantly increased than that of the control group (Z=-3.50, p<.001). Conclusion: The taekwondo exercise program may have affirmative effects on physical fitness, physical function, and quality of life in women with osteoarthritis.

• The Plant Pathology Journal
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• v.26 no.2
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• pp.139-148
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• 2010

A virus causing stunt, yellowing, severe mosaic, malformation symptoms on leaves and uneven development and malformation on fruits of zucchini was prevalent around Goseong, Gyeongsangnam-do, Korea. A survey conducted (2004) in the Goseong area revealed about 20% virus infection rate. The disease causative identified as Cucumber mosaic virus (CMV-Z1) was further characterized. The isolate induces mosaic symptoms on Cucumis sativus, while severe mosaic, stunt and malformation on C. pepo. Thin section analyses have shown that virus inclusions are formed in the cuticle layers as well as epidermal, parenchyma and collenchymas cells in virus-infected Nicotiana tabacum. CMV-Z1 isolate induced specific cytoplasmic inclusion bodies such as irregular clumps (IC), crystal (Cr) and irregular chloroplasts (ICh). IC was made up of virus particles interspersed with a darkly stained amorphous material and found both in the cytoplasm and vacuoles, whereas ICh and Cr were rarely found in the vacuoles. The genome of CMV-Z1 RNA-1 consists of 3359 nucleotide (nt) encoding 1a protein of 993 amino acids (aa). The CMV-Z1 RNA-2 was 3050 nt in length containing 2a (857 aa) and 2b (110 aa), while RNA-3 encoding 3a movement protein (279 aa) and coat protein (218 aa) was 2215 nt in length. Phylogenetic analyses of nucleotide sequences of CMV-Z1 isolate appeared it is more closely related to subgroup IA than to subgroup IB or II.

• The Journal of Korean Medicine
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• v.41 no.3
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• pp.205-220
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• 2020

Objectives: The aim of this review is to assess the clinical benefit of chuna for managing symptoms in chronic fatigue syndrome (CFS) Methods: We searched eligible studies from the following 11 databases with no language restriction: Pubmed, CENTRAL, Embase, CNKI, CQVIP, Wanfang, CiNii, OASIS, RISS and Koreamed. We selected randomized controlled trial (RCT), quasi-randomized controlled trial (Quasi-RCT) and controlled clinical trial (CCT) in which patients with chronic fatigue syndrome were treated with chuna. The results of the included studies were synthesized through meta-analysis, and their risk of bias were also assessed. Results: We searched 914 potentially relevant studies, and only 20 studies were selected for this systematic review. Meta-analysis showed that chuna was more effective in improving general symptoms (n=291, RR 0.19 [95% CI 0.11 to 0.32], Z=6.08, p<0.00001, I2=0%), fatigue (n=487, SMD -0.95 [95% CI -1.19 to -0.71], Z=7.76, p<0.00001, I2=37%) and sleep disorder (n=139, SMD -0.58 [95% CI -0.92 to -0.24], Z=3.36, p=0.0008, I2=0%) compared to health supplements or usual care. When chuna was used as an added intervention, it was more effective in improving general symptoms(n=729, RR 0.25 [95% CI 0.15 to 0.42], Z=5.19, p<0.00001, I2=0%) and fatigue severity alone(n=217, SMD -1.21 [95% CI -1.53 to -0.89], Z=7.45, p<0.00001, I2=15%) compared to control. Conclusion: We found that chuna was beneficial for improving severity of general symptoms and fatigue at post treatment in CFS patients.