• Journal of the Korean Society for Industrial and Applied Mathematics
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• v.11 no.1
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• pp.71-83
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• 2007

The double diffusive convection of cold water in the vicinity of its density maximum in a rectangular partitioned enclosure of aspect ratio 5 with isothermal side walls and insulated top and bottom is studied numerically. A thin partition is attached to the hot wall. The species diffusivity of the fluid is assumed to vary linearly with concentration. The governing equations are solved by finite difference scheme. The effects of position and height of the partition, variable species diffusivity and enclosure width are analyzed for various hot wall temperatures. It has been found that adding partition on the hot wall reduces the heat transfer. The density inversion of the water has a great influence on the natural convection. When increasing species diffusivity parameter heat and mass transfer rate is decreased.

• Bulletin of the Korean Space Science Society
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• 2009.10a
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• pp.48.3-49
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• 2009

The purpose of this paper is to introduce the KOMPSAT-2 Direct Receiving and Processing System, hereafter DRS, located in Svalbard, Tromso and Toulouse. The KOMPSAT-2 from KOMPSAT-2 satellite and generating preprocessed image data that is a kind of raw image data for standard image production. The products generate from this system are comprised of 1R and 1G product upon having a geographic coordinates. In the following paragraph, it is described that DRS configuration, data processing procedure and product characteristics and then, the value-added image production test such orthoimage is introduced.

• Textile Coloration and Finishing
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• v.4 no.4
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• pp.104-109
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• 1992

양모의 반응성 방염처리제(DRB, DRM, DRS, DRN)를 합성하고 이들과 sulphamic acid(SA)를 방염(dye resist) mechanism을 이용하여 방오처리에 응용, 그 효과를 검토하였다. 방오효과는 SA>DRB>DRM>DRS>DRN의 순으로 우수하였다. DCCA처리 양모의 경우는 SA처리 양모만이 방오효과를 나타내었다. 4종류의 합성된 반응성 방염처리제는 DCCA 처리 앙모에 dye assist 효과를 나타내었다. 80% 이상의 방오효과만이 시각적으로 오염을 구분할 수 없었으므로 SA 처리방법은 방오가공에 응용 가능하나, DRB 처리법은 약간의 개선이 필요했다. 이러한 방염처리방법을 방오가공에 응용할 때에 양모 carpet 등의 습윤오염(커피나 쥬스 등 색소성 오염)의 감소효과가 기대 되어 진다.

• Membrane Journal
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• v.27 no.2
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• pp.138-146
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• 2017

The new types of phenoxy-carboxylatophenoxy cosubstituted polyphosphazene were synthesized with various substitution rates. Diabetic diagnostic membranes were prepapared with these types of polyphosphazenes and final absorbances at 680 nm through these membranes were measured at various concentrations of glucose in blood. Basically, the end-point results of varying absorbance values according to time (K/S) had a linear relationship to the glucose concentration. The effects of substitution rates with hydrophilic carboxylatophenoxy groups and hydrophobic phenoxy groups on the glucose concentration measurements were examined. It was very difficult to measure glucose concentration in less than 10% of the hydrophilic substitution rates, because the glucose penetration rate was too slow. But dose-response slope (DRS) values between glucose concentration and K/S values increased as the hydrophilic substitution rates increased in more than 10% of the hydrophilic substitution rates. However, in more than 30% of the hydrophilic substitution rates, DRS value was too rapidly increased, because glucose penetration rate was too fast.

• Proceedings of the Korea Society of Design Studies Conference
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• 2004.10a
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• pp.248-249
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• 2004

• Journal of Nutrition and Health
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• v.43 no.6
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• pp.638-652
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• 2010

A valid food or dish frequency questionnaire needs to be developed in Korea for accurate dietary assessment because the dietary practices of Koreans are very different from those of other countries. This study was conducted to evaluate the accuracy of the newly developed, semi-quantitative, dish-based frequency questionnaire (Semi-DFQ) with 12-day dietary records (12-DRs) as a gold standard. The study subjects were 115 men and 173 women aged 30-65 years old. We calibrated the frequency, portion size and daily intake of 112 dish items reported in Semi-DFQ with those in 12-DRs by Spearman rank correlation coefficients (SCCs). The consumption frequency and portion size reported in Semi-DFQ were higher than those in 12-DRs. The SCCs for the consumption frequency of various dishes ranged from -0.07 (fried seaweed) to 0.70 (instant coffee), the portion size ranged from -0.09 (cold seaweed soup) to 0.68 (soju), and the daily intake ranged from -0.07 (fried seaweed) to 0.71 (soju). The SCCs were higher for dishes consumed daily, such as steamed rice,milk, coffee and alcohol, than those of foods eaten rarely. The overall agreements between the Semi-DFQ and 12-DRs were low for categories of consumption frequency and portion size, even though some dishes showed high SCCs. The SCCs of the two methods in consumption frequency and amount were higher among the women and younger subject. The results revealed the limitation of the Semi-DFQ for evaluating the status of usual individual intake. Therefore, the Semi-DFQ can be used in addition as dietary records and 24-hour recall depending on the research aims.

• Language and Information
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• v.3 no.2
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• pp.67-83
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• 1999

This paper attempts to provide an account for the problems of intensional opacity of referring expressions and the presupposition inheritance in the belief contexts from the discourse perspective. I discuss Jaszczolt's discourse model based on DRT to account for the belief reports. Jaszczolt analyzes referring expressions in terms of the three readings(de re, de $dicto_1$ and de $dicto_2$) and attempts to represent the differences between them in the DRS's via different anchoring modes; external anchoring, formal anchoring and nonanchoring. I propose an extended model to account for the presupposition inheritance in the belief contexts and attempt to analyze the data in Korean based on this model. The differences in the PI and in the representations of DRS's which are induced by the different complement types, ${\ldots}ko(mitta)\;and\;{\ldots}kesul(mitta)$, are discussed.

• Korean Journal of Psychosomatic Medicine
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• v.26 no.2
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• pp.112-118
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• 2018

Objectives : Delirium is one of the most common mental illnesses that can affect cognitive function. Melatonin has been shown to be effective in the treatment of insomnia, and recent studies have shown a protective effect to prevent delirium. This study was conducted to investigate the efficacy of melatonin in delirium patients. Methods : All patients were referred to psychiatric department for insomnia and symptoms of delirium, and were diagnosed delirium by the DSM-5 diagnostic criteria. We compared base line severity of delirium with K-DRS-R-98-R (Korean version of Delirium Rating Scale revised 98) and after taking 2mg of melatonin, retrospectively. The side effects were also identified by referring to the medical records. Results : A total 21 patients had taken melatonin for insomnia and delirious symptoms. The K-DRS-R-98 scores were decreased from $15.24{\pm}2.64$ before treatment to $6.57{\pm}5.42$ after treatment. And CGI-S scores were also decreased from $4.14{\pm}0.48$ before treatment to $2.81{\pm}0.93$ after treatment (p<0.05). Conclusions : This study illustrates the possibility of melatonin as an effective treatment option for delirious symptoms such as disorientation, motor agitation, lability of affect and hallucinations as well as insomnia, with less concerns of drug side effect. Further study with a larger sample and prospective design will be required to confirm these results.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.11
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• pp.1019-1024
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• 2009

Visible-light-active $TiO_2-_xN_x$ nanoparticles with a homogeneous anatase crystalline structure were successfully prepared through a hydrolysis of $TiCl_4$ with ammonia solution. The samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), $N_2$-sorption, and UV-vis diffuse reflectance spectra (DRS) techniques. The light absorption onset shifted from 390 nm on pure $TiO_2$ to the visible region at 530 nm on nitrogen-doped $TiO_2$. A clear decrease in the band gap was deduced from the DRS results. The photocatalytic activity was evaluated from the photodegradation of congo red solution under visible light irradiation. The photocatalyst showed the highest photocatalytic activity at an optimal value of nitrogen doping concentration. This was suggested that the nitrogen doping should have an important effects on the improvement of photocatalytic activity.

• Journal of Oriental Neuropsychiatry
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• v.18 no.3
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• pp.289-298
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• 2007

Delirium is a acute syndrome of disorientation caused by disfunction of brain tissue and has a variety of symptomes. It is characterized by disturbance of consciousness and attention, cognition, and perception for a brief period of time and tends to fluctuate during the course of the day. We experienced a 56 year-old woman who had a hypertension as well as Delirium caused by cranial contusion and whose condition was improved by Oriental medical treatment. this case study illustrates what the manifestation of Delirium caused by cranial contusion. This study shows more objective mecical pregress by grading Korean version of Delirium Rating Scale(K-DRS) and Korean version of Mini-Mental State Examination(K-MMSE). After our treatments, Delirium and some other symptoms were improved.