• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.264-267
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• 2000

본 논문에서는 이동국의 안테나로부터 방사되는 전파의 일부가 인체에 흡수되므로써 기지국에서 수신되는 E$_{b}$ N$_{t}$의 감소에 대해 조사하였고, 감소된 E$_{b}$ N$_{t}$를 기준으로 하여 전파의 인체 흡수가 DS/CDMA BPSK 시스템의 성능에 미치는 영향을 분석하였다. 분석 결과, 인체에서의 흡수가 30[%]에서 40[%]로 증가할 때 기지국에서의 E$_{b}$ N$_{t}$, 값이 약 0.5 [dB] 정도 감소함을 알 수 있으며, 40 [%]에서 50[%]로 중가할 때에는 약 0.6 [dB] 정도 감소함을 알 수 있었다. 또한 시뮬레이션을 통해 사용자 수가 15 명일 때 약 2.5 [dB]의 E$_{b}$ N$_{t}$ 값에서 음성 서비스가 가능하다는 것을 알 수 있었다. 그리고 이러한 E$_{b}$ N$_{t}$ 값을 만족시키려면, 흡수율이 10 [%] 증가 할 때마다 안테나 방사 전력을 약 20 [mW] 이상 증가시켜야 한다는 것도 알아내었다. 것도 알아내었다.

• Journal of Magnetics
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• v.3 no.4
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• pp.116-119
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• 1998

Influence of small additions ($\leq$2.0 at.%) of Al, Ti, Co, and Ni on the microstructural development and the magnetic properties of melt-spun Fe-Bd-C alloys was investigated. Addition of these elements tended to stabilize the crystallization of as-spun ribbons. Especially, Al and Ti preferred to stabilize$ Fe_{17}Nd_2C_x.$ The average grain size of Fe17Nd2Cx (0.1~0.3 ${\mu}{\textrm}{m}$), obtained by a proper annealing, in the ribbon treated with 0.5 at.% additive was much smaller than that of additive-free ribbons, which would be the major source of large increase in coercivity. Among the additives, Ni was very effective to increase the coercivity whereas Co had beneficial effect on $T_c.$ By adding 0.5 at.% Ni, intrinsic coercivities of more than 1.4 T, 40~50% higher than that (~1.0T) of additive-free ribbons, can be obtained after annealing at 750~80$0^{\circ}C$.

• Fashion & Textile Research Journal
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• v.2 no.3
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• pp.234-238
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• 2000

In this study it was measured seam strength of T/C which has the different processing methods and density. Also it was measured seam strength by the change of angle in the pattern and the kinds of threads. The results of this study are as follows; The seam strength is stronger in order of $90^{\circ}/90^{\circ}$ > $0^{\circ}/0^{\circ}$ > $70^{\circ}/-70^{\circ}$ > $70^{\circ}/70^{\circ}$ > $60^{\circ}/60^{\circ}$ > $60^{\circ}/-60^{\circ}$ > $30^{\circ}/30^{\circ}$ > $30^{\circ}/-30^{\circ}$ > $45^{\circ}/-45^{\circ}$ > $45^{\circ}/45^{\circ}$ by the cutting directions, in order of T/C3>T/C1>T/C4>T/C2 by the samples and in order of 60's/3>40's/2>60's/2>50's/2 by the threads.

• Korean Journal of Microbiology
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• v.7 no.2
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• pp.57-62
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• 1969

The experiments attempted to basic studies on the atmospheric dioxide in Korea and on the elimination of sulfur in oil Thiobacilli in order to control of atmospheric sulfur dioxide. The results of experiments are following as : 1) Content of atmospheric sulfur dioxide in industrial zone which used kerosene for fuel was 0.092 ppm(average) and 0.16ppm(maximum). 2) Content of sulfur dioxide at room air which used briquet for stove fire was 0.44ppm (average) adn 0.50 pp,(maximum). 3) Thirteen strains of thiobacilli were isolated from Korean soil and sewage and they were identified with T. thiooxidans (5strains), T. thioparus(3strains), T.ferrooxidans 3 man's observation and the description in Bergey's manual. 4) Two promising strains, one of T. thiooxidans and one of T. ferooxidans. were selected for elimieation of in kerosene.

• Membrane and Water Treatment
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• v.10 no.5
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• pp.321-330
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• 2019

The objective of this study was to examine the recovery of the power plant cooling tower blowdown water (CTBD) by membrane distillation. The experiments were carried out using a flat plate poly vinylidene fluoride (PVDF) membrane with a pore diameter of $0.22{\mu}m$ by a direct contact membrane distillation unit (DCMD). The effects of operating parameters such as transmembrane temperature difference (${\Delta}T$), circulation rate and operating time on permeate flux and membrane fouling have been investigated. The results indicated that permeate flux increased with increasing ${\Delta}T$ and circulation rate. Whereas maximum permeate flux was determined as $47.4L/m^2{\cdot}h$ at ${\Delta}T$ of $50^{\circ}C$ for all short term experiments, minimum permeate flux was determined as $7.7L/m^2{\cdot}h$ at ${\Delta}T$ of $20^{\circ}C$. While $40^{\circ}C$ was determined as the optimum ${\Delta}T$ in long term experiments. Inorganic and non-volatile substances caused fouling in the membranes.

• Korean Journal of Clinical Laboratory Science
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• v.37 no.2
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• pp.118-122
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• 2005

An epidemiological study was performed on zoophilic dermatophytes. The number of patients with zoophilic dermatophytes diagnosed on clinical findings and culture at the Catholic Dermatological Clinic in Daegu City were 1,339 for 10 years from January 1995 to December 2004. Species of zoophilic dermatophytes isolated from 47,925 patients with dermatophytes were as follows; Trichophyton(T.) rubrum was isolated from 43,702 (91.2%), T. interdigitale 2,660 (5.6%), Epidermophyton(E.) floccosum 43 (0.1%), T. tonsurans 131 (0.3%), T. mentagrophytes 625 (1.3%), T. verrucosum 56 (0.2%), Microsporum(M.) canis 658 (1.4%), and M. gypseum 50 (0.1%). Zoophilic dermatophytes infections were chiefly Tinea facial in the cases of T. mentagrphytes and Tinea corporis in the cases of T. verrucosum, but Tinea capitis in the cases of M. canis. Number of patients with zoophilic dermatophytes by site and age were as follows; Most patients with infected scalps were young people under 15 years old. Infection of the trunk area (neck,chest,back) and extremities (arms, legs, hands, feet) were relatively high in those patients over 15 years old. M. canis were most frequently isolated in autumn and winter, and T. mentagrophyts and T. verrucosum were mostly in spring and winter.

• The Journal of the Korean Society for Microbiology
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• v.15 no.1
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• pp.71-75
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• 1980

Antisera to ox red blood cell were prepared by intraperitoneal hypermultiple injections without adjuvant in outbred white rabits. Purified IgG fraction from these rabbits anti-ox red blood cell antiserum for T subset assay was obtained by precipitation with 50% saturated ammonium sulphate followed by DEAE-cellulose chromatography and Sephadex G-150 gel filtration. These purified IgG fraction was compared with Cappel company standard IgG fraction for $T_G$ subpopulation assay. We used home-made IgG fraction and obtained favorable results in $T_G$ subopulation assay as Cappel company standard IgG fraction.

• Solar Energy
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• v.8 no.2
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• pp.46-56
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• 1988

This investigation concerns thermal stratification of the water due to the temperature difference (${\Delta}T=T_{\infty}-T_i$) between the mean temperature of the water in the test tank (1m wide, 1m high, 2.1m long) and the temperature of the inflow water into the tank; flow rate of circulating water and height of the sink diffuser in the test tank. The additional objectives was to observe a stratification phenomena near an interface by measuring the velosities and the temperature difference and investigate an availabilities of the better effective hot water through establishing thermocline near an interface around the bottom of the tank. Following results were obtained through the experiments. 1. When the flow rate was constant and the temperature difference (${\Delta}T=T_{\infty}-T_i$) between the mean temperature of the flow in the test tank and the temperature of the inflow water increased by 5.6, 9.5, 13.5($^{\circ}C$), obtained the better effective advantage of hot water and the stress near an interface increased gradually. 2. When the ${\Delta}T=T_{\infty}-T_i$ was constant and flow rate increased by 4.0, 4.8, 6.4, 8.0 (LPM), obtained the better effective advent age of hot water and the mean stress near an interface increased gradually. 3. When the height of the sink diffuser was 25cm from tank bottom in comparison with 50cm, obtained the better effective advantage of hot water and the mean stress near an interface increased.

• Journal of Nutrition and Health
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• v.35 no.10
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• pp.1045-1052
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• 2002

Hyperhomocysteinemia, resulted from an interaction between the mutation of MTHFR gene and B vitamin deficiency, is suggested as a possible cause for complications and adverse outcomes of pregnancy. The purpose of the present study was to investigate the relationship between the intakes of B vitamins and serum homocysteine concentrations with the C677T mutation in the MTHFR genotypes in 135 normal pregnant women of 24-28 weeks of gestation. Dietary intake of B vitamins did not differ among the three genotypes, but the negative correlation between dietary folate intake and the serum homocysteine level was the strongest in the T/T type (r ＝ -0.249) than in other genotypes (C/T: r＝ -0.040, C/C:r＝ 0.126, p＜0.05). Among the subject with the T/T type, the pregnant women who consumed folate less than 50% of the RDA had higher serum homocysteine levels than those who consumed folate greater than 125% of the RDA (10.4$\pm$5.9 vs 7.0$\pm$1.5 $\mu$mol/L, p＜0.05). Serum homocysteine levels were higher in the women with micronutrient supplements than those with no supplements in the T/T type, but such relation was not present in the C/C or the C/T type. In conclusion, serum homocysteine concentrations were influenced by the interrelationship between the MTHFR polymorphisms and dietary folate intake or micronutrient supplementation.

• Journal of the Korean Mathematical Society
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• v.50 no.5
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• pp.991-1008
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• 2013

In this paper, we mainly discuss Gorenstein Dedekind do-mains (G-Dedekind domains for short) and their overrings. Let R be a one-dimensional Noetherian domain with quotient field K and integral closure T. Then it is proved that R is a G-Dedekind domain if and only if for any prime ideal P of R which contains ($R\;:_K\;T$), P is Gorenstein projective. We also give not only an example to show that G-Dedekind domains are not necessarily Noetherian Warfield domains, but also a definition for a special kind of domain: a 2-DVR. As an application, we prove that a Noetherian domain R is a Warfield domain if and only if for any maximal ideal M of R, $R_M$ is a 2-DVR.