• Korean Journal of Head & Neck Oncology
• /
• v.26 no.2
• /
• pp.259-261
• /
• 2010

The meningiomas are slowly growing tumors arising from meningoepithelial cells and they generally occur in the intracranial space. Tumor extension to the extracranial structures occurred in about 20 percent of intracranial meningiomas. Meningiomas extending to the cervical area are uncommom. Beacuse these patients complain of localized symptoms, sometimes those tumors have been operated as cervical tumors. In this report, we incidentally found a meningioma in the left parapharyngeal space in a 63-year-old female, who was confirmed by histopathologic diagnosis to have meningioma. We report herewith this case with the review of literatures.

• Journal of the Korean Society for Precision Engineering
• /
• v.30 no.12
• /
• pp.1335-1340
• /
• 2013

Herein the water film was introduced to the hydrophilic area on the line patterned surface to solve the contradiction caused by surface roughness (high different wettability has advantage to control the droplet but high roughness for that high wettability difference causes obstruction of droplet moving). Thus the droplet on the water film could not be hindered to line direction but restricted to orthogonal direction, effectively. In addition, droplet behaviors according to droplet volume and line thickness were studied. Droplet fell off the line with narrowing the interface between the droplet and the water film on the line. When the droplet fell off the line, the plate angle was designated as a critical plate angle and it used as an indicator of surface capability to control the droplet. As a result critical plate angle increases as droplet volume decreases and line thickness increases.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.25 no.12
• /
• pp.1766-1775
• /
• 2001

A theoretical analysis on the heat and mass transfer in an evaporative cooler is presented in this work. The evaporative cooler is modeled as a channel filled with porous media the interstitial surface of which is covered by thin water film. Assuming that the Lewis number is unity and the water vapor saturation curve is linear, exact solutions to the energy and vapor concentration equations are obtained. Based on the exact solutions, the characteristics of the heat and mass transfer in the evaporative cooler are investigated. The comparison of the cooling performance between the evaporative cooler and the usual sensible heat exchanger is also carried out. Obviously, the evaporative heat exchanger shows better cooling performance than the sensible heat exchanger. This is due to the latent heat of water vaporization, which results in apparent increases both in the interstitial heat transfer coefficient and the specific heat of the air stream in the evaporative cooler.

• Journal of the Korean Solar Energy Society
• /
• v.35 no.4
• /
• pp.9-15
• /
• 2015

Black cobalt solar selective coatings were prepared by using an electroplating method. The changes in the optical properties of the black cobalt selective coating due to thermal degradation were analyzed by using the Auger electron spectroscopy (AES) and spectrophotometer. The black cobalt selective coating was prepared on a copper substrate by using a synthesized electrolyte with $CoCl_2$ and KSCN at a current density of ${\sim}0.5A/dm^2$ for 45s ~ 60s. Its optical properties were a solar absorptance (${\alpha}$) of the order of 0.80 ~ 0.84 and a thermal emittance (${\epsilon}$) of 0.01. From the AES depth profile analysis of heated sample, thermal degradation of the black cobalt selective coating heated for 33 hours at temperature of $350^{\circ}C$ occurred primarily due to interdiffusion at interface of cobalt and copper substrate. This results were predictable that the ${\alpha}$ decreases due to the thermal oxidation and diffusion.

• Journal of the Korean Solar Energy Society
• /
• v.28 no.1
• /
• pp.33-42
• /
• 2008

Zr-O ($Zr-ZrO_2$) cermets solar selective coatings with a double cermets layer film structure were prepared using a DC (direct current) magnetron sputtering method. The typical film structure from surface to bottom substrate were an $Al_2O_3$ anti-reflection layer on a double Zr-O cermets layer on an Al metal infrared reflection layer. Optical properties of optimized Zr-O cermets solar selective coating had an absorptance of ${\alpha}\;=\;0.95$ and thermal omittance of ${\epsilon}\;=\;0.10\;(100^{\circ}C)$. The absorbing layer of Zr-O cermets coatings on glass and silicon substrate was identified as being amorphous by using XRD. AFM showed that ZF-O cermets layers were very smooth and their surface roughness were approximately $0.1{\sim}0.2 nm$. The chemical analysis of the cermets coatings were determined by using XPS. Chemical shift of photoelectron binding energy was occurred due to the change of Zr-O cermets coating structure deposited with increase in oxygen flow rate. The result of thermal stability test showed that the Zr-O cermets solar selective coating was stable for use at temperature below $350^{\circ}C$.

• Pediatric Infection and Vaccine
• /
• v.9 no.1
• /
• pp.117-121
• /
• 2002

Although the incidence of intracranial tuberculosis in children have been decreased with development of antituberculous therapy, mortality rate is still high as formerly if the diagnosis and treatment was not performed early. Authors report a case of a 5-month old male with multiple intracranial tuberculoma who have been accompanied by miliary tuberculosis and tuberculous meningitis. He was hospitalized at the pediatric department of Wonkwang University Hospital with mild fever and persistent cough. The brain MRI was performed and showed that there were multiple intracranial micronodular densities, perinodular edema and diffuse leptomeningeal enhancement which were disappeared completely after antituberculosis chemotherapy for 12 months and he had completely recovered without sequale.

• Journal of the Korean Solar Energy Society
• /
• v.31 no.4
• /
• pp.48-56
• /
• 2011

Black cobalt solar selective coatings were prepared by thermal oxidation of electroplated cobalt metal on copper and nickel substrates. The optical properties and structure of the black cobalt selective coating for solar energy utilizations were characterized by glow discharge spectrometry (GDS), ultraviolet-visible-near infrared (UV-VIS-NIR) spectrometer, atom force microscopy(AFM) and X-ray photoelectron spectroscopy(XPS). The optical properties of optimum black cobalt selective coating prepared on copper substrate were a solar absorptance of 0.82 and a thermal emittance of 0.01. From the GDS depth profile analysis of these coatings, the concentration of cobalt particles near the interface was higher than at the surface, but oxygen concentration at the surface was higher than at the interface. These results suggest that the selective absorption was dominated by this chemical composition variation in the coating. The surface of this film exhibited morphology with root-mean-square(rms) roughness of about 144.3nm. XPS measurements data showed that several phases of Co coexist($Co_3O_4$,CoO) in the film.

• Journal of the Korean Society of Radiology
• /
• v.81 no.2
• /
• pp.453-458
• /
• 2020

Hashimoto's encephalopathy (HE) is a rare autoimmune disease characterized by a high serum concentration of antithyroid antibodies without evidence of cerebral disease. Magnetic resonance imaging (MRI) findings in HE patients are nonspecific, although diffuse or focal white matter changes have been reported in several cases. We present a rare case involving a 79-year-old woman with elevated antithyroid antibody levels and abnormal imaging findings similar to meningoencephalitis. Serial MRI initially showed multiple T2 hyperintense lesions with diffuse leptomeningeal enhancement that disappeared after steroid therapy.

• Pediatric Infection and Vaccine
• /
• v.14 no.1
• /
• pp.43-46
• /
• 2007

Purpose : Neonatal bacterial meningitis has been known that its mortality and morbidity is high and its neurologic complications are common. This study was performed to review of the etiology of neonatal bacterial meningitis in Busan, Korea. Methods : We retrospectively analyzed 21 medical records of patients who were diagnosed neonatal bacterial meningitis in four university hospitals in Busan from January 1997 to December 2005. We analyzed age at onset of symptoms, symptoms at admission, causative organisms, and complications. Results : There were 11 male patients and 10 female patients. One premature neonate was included. 7 patients had symptoms at 2-3 weeks after birth and 6 patients at 1-2 weeks after birth. 18 cases had fever, 8 cases had seizure and some had poor feeding, lethargy and irritability. The most common organism causing neonatal bacterial meningitis was Group B streptococcus (GBS). 11 cases were due to GBS, 3 cases due to E. coli, 3 cases were due to Klebsiella pneumoniae, and 2 cases due to Streptococcus pneumoniae. one Listeria monocytogenes and one Enterobacter cloacae were included. 18 patients were alive and 3 patients died. Mental retardation, developmental delay and epilepsy occurred in a living patient. Conclusions : Although this was a retrospective study, we found that Group B streptococcus (GBS) was the most common organism causing neonatal bacterial meningitis and this data is nearly same as others in the world.

• Economic and Environmental Geology
• /
• v.48 no.5
• /
• pp.409-420
• /
• 2015

The Sangdae-ri riverside around Musimcheon stream, flowing through Gadeok-myon of Cheongju City, is one of the representative strawberry fields employing water curtain cultivation (WCC) in Korea. In this area, annual groundwater use for WCC has been calculated by a few methods. On the assumption that all the water flowing through the final ditch may be mostly composed of groundwater, the discharge rate in it can be used as a good proxy for assessing the groundwater use. However, in the study area, the final ditch was set up in an unpaved state near and parallel to Musimcheon stream. Under such circumstances, the drainwater is likely to be influenced by infiltration and/or inflow of nearby stream. Hence, we examined whether or not stream water has influenced water flowing out through the final ditch in respect of ion concentrations or field parameters such as T, pH and electrical conductivity (EC) values. The period of measuring field parameters and sample collection was from February 2012 through February 2015. The drainwater in the final ditch did not show the average quality of groundwater, but similar quality of stream water in respect of pH, EC, ion contents and water type. From this, it is suggested that measuring the flow rate of the final ditch should not be directly used for assessing groundwater use in the study area. In addition, because of its sensitivity to ambient temperature, water temperature proved not to be appropriate for estimating the interaction between ditch and stream. For accuracy, additional methods will be needed to calculate mixing ratios between stream and ground water within drainage system.