• Korean Journal of Head & Neck Oncology
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• v.34 no.2
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• pp.47-51
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• 2018

Thyroglossal duct cyst is most common type of congenital cervical tumor. The suprahyoid thyroglossal duct cyst is a subtype of thyroglossal duct cyst and has different clinical characteristics. This subtype shows recurrent submental swelling and no tumor movement during swallowing or tongue protrusion. Because of these clinical differences, it is important to consider the possibility of thyroglossal duct cyst of in diagnosis and surgery of submental tumor. Recently, we have experienced two cases of suprahyoid type thyroglossal duct cyst with submental swelling and treated successfully by Sistrunk's operation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.6
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• pp.1775-1781
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• 2008

The effects of the type of curing agent on the swelling of the natural rubber(NR) sponge applicable to the self-sealing layer of a helicopter fuel tank were investigated. The curing systems employed were peroxide and mixed ones of sulfur and peroxide. The NR compounds were prepared in a kneader and a roll-mill. The compounds were partially cured in a press at high pressure and subsequently cured fully with expansion in another press at atmospheric pressure. The apparent density of the NR sponge was measured and the cell structure was observed with scanning electron microscopy. The swelling experiments were performed at room temperature using toluene, iso-octane, and an aircraft fuel as a solvent. More rapid volume swelling of the NR sponge cured by peroxide was achieved than cured by sulfur and peroxide with similar amount of curing agent added in rubber compounds. The apparent density and cell structure of the sponge were extremely sensitive to the amount of peroxide, which influences again the swelling behavior of the NR sponge. It is important to control properly two reactions of decomposition of foaming agent and crosslinking of NR in the mold to obtain rapid swelling of the NR sponge on contact of the fuel.

• Journal of the Korean Society of Safety
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• v.21 no.1 s.73
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• pp.86-91
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• 2006

Oil spills caused by the accidents have been occurred from house and factory waste, grounded tanker, the rupture of storage tank and oil pipelines, the deterioration of various industrial facilities, etc. Many oil spills result in contamination of shorelines and workplace. Fire and explosion may happen from these spills. There are several technologies used for clean-up application, which include use of oil dispersing agents, absorbents, solidifiers, booms and skimmers by physical, chemical, and biological methods. Methods for oil spill clean-up operation are classified into the absorption type, gel type and self-swelling type. Porous materials with oil absorptive properties are classified into micropore, mesopore, and macropore depending on their pore sizes. Recently, new porous materials with smaller size have been developed, but the selective oil absorption in water-in-oil interface demonstrates the macro pore size. In this study oil absorption effects were evaluated using the organic porous materials with a complex function of gel type and swelling type. Samples were subjected to analysis by FT-IR spectroscopy and were characterized in terms of gel formation and morphologies. Oil sorption capacity, pressure retention force and gel strength were also measured. From these results, the physicochemical reactivity before and after gelation was verified and the industrial applications of clean-up operation were suggested.

• Macromolecular Research
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• v.17 no.4
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• pp.250-258
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• 2009

One-step seeded polymerization was used to prepare $7{\sim}10{\mu}m$ of crosslinked monodisperse spheres with four crosslinking agents using $4.68{\mu}m$ poly(methyl methacrylate)(PMMA) seed particles in aqueous-alcoholic media in the absence of the swelling process. The crosslinking agents used were ethylene glycol dimethacrylate(EGDMA), allyl methacrylate(AMA), 1,6-hexanediol diacrylate(HDDA) and trimethylolpropane trimethacrylate(TMPTMA). The effects of the type and concentration of the crosslinking agents on the swelling, pore size, thermal property of the networks and morphology of the particles were studied. The chemical structures and concentrations of the crosslinking agents affected both the swelling ratio and the porosity of the networks. In addition, the chemistry of the reactive vinyl group and chain length of the crosslinking agents affected the stability of the monodisperse particles of the ultimate morphology.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.623-624
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• 2007

This work examines the effects of swelling MI type HVDC cable oil on the semiconductive silicone rubber and silicone rubber as used in accessories for application on outdoor termination (EBA) slip on sleeve. The behavior of volume resistivity is monitored as a function of the amount of cable oil diffused into the material. Resistivities of semiconductive silicone samples up to the typical insulator range (${\sim}10^{10}{\Omega}-cm$) are observed as a consequence of swelling due to the presence of the diffused oil. The measured volume resistivities of the oil-impregnated semiconductive silicone rubber are compared to desired value as function of stress relief cone.

• Journal of Trauma and Injury
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• v.19 no.1
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• pp.8-13
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• 2006

Purpose: Traumatic head injury is very common in the emergency room. Early diagnosis and treatment can significantly reduce mortality and morbidity. When diagnosis is delayed, however, it could be critical to the patients. In reality, it is difficult to take a brain CT for all patients with head trauma, so this study examined the relationship between type and size of scalp injury and intracranial injury. Methods: This prospective study was conducted from May 2005 to July 2005. The participants were 193 patients who had had a brain CT. Head trauma included obvious external injury or was based on reports of witnesses to the accident. Children under three years of age were also included if there was a witness to the accident. The size of the injury was measured based on the maximum diameter. Results: Out of the total of 193 patients, patients with scalp bleeding totaled 126 (65.2%), and patients without scalp bleeding totaled 67 (34.8%). Among patients with scalp bleeding, patients with intracranial injuries numbered nine, and among patients without scalp bleeding, patients with intracranial injuries numbered 17 (P=0.001). Among patients who showed evidence of scalp swelling with no scalp bleeding, the relationship between the size of the scalp swelling and intracranial injury was statistically significant when the size of the scalp swelling was between 2 cm and 5 cm. Conclusion: Among patients who visit an emergency medical center due to traumatic head injury, patients with no scalp bleeding, but with scalp swelling between 2 cm and 5 cm, should undergone more accurate and careful examination, as well as as a brain CT.

• Applied Biological Chemistry
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• v.28 no.3
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• pp.156-161
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• 1985

Physicochemical properties and characteristics on lintnerization of sweet potato starches from Wouki(the dry type), Shinmi(the intermediate type) ana Chunmi(the moist type) were investigated. Swelling and gelatinization curves of these starches showed a two-stage process. Swelling powers of starches were higher in order of Shinmi, Chunmi and Wonki over a range of temperatures. Amylose content of Wonki was higher than those of other two. Hydrolytic patterns of three starches with 2.2 N HCI at $35^{\circ}C$ showed two distinct stages. Hydrolysis extents of Wonki starch were lower than those of Shinmi and Chunmi starches. X-ray diffraction patterns of native and lintnerized starches were the Ca crystalline type. The relative crystallinities of these starches were higher in order of Worki, Chunmi and Shinmi.

• Journal of the Korean Society of Food Culture
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• v.36 no.5
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• pp.484-491
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• 2021

This study investigated the effect of dry heat treatment (DHT) on the physicochemical properties of hard type (HR) and floury type (FR) rice to improve the processing aptitude of rice flour. The rice flour was heated at 130℃ for 0, 2 and 4 hours, and the color value, water absorption index (WAI), water soluble index (WSI), swelling power, solubility, pasting properties, particle shape and the X-ray diffraction were measured. After DHT, the L value of rice flour decreased, and the b value increased. The WAI, WSI, swelling power and solubility of HR and FR increased with the increase of treatment time. The cold viscosity and setback increased, while breakdown decreased. Cracks and lumps formed with fine particles were observed. The X-ray diffraction pattern was A-type, while the diffraction intensity decreased. According to the results of the two-way analysis of variance (ANOVA) test, the hydration and pasting properties were significantly different between HR and FR and were affected by DHT time. The results suggest that the properties of modified rice flour by DHT can be used in the food industry.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.23 no.1
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• pp.115-124
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• 1993

The purpose of this study was to evaluate the clinical and radiographic features of 35 cases of nasopalatine duct cyst by means of the analysis of periapical and/or occlusal radiograms in 35 persons visited the Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University and Chonbuk National University. The obtained results were as follows: 1. The incidence of nasopalatine duct cysts was higher in males(74.3%) than in females(25.7%). 2. The nasopalatine duct cysts were the most frequently occurred in the 4th decades(34.3%). The 6th and 7th decades(17.1%, 17.1%) were next in order to frequency followed by the 5th decades(14.3%), the 3rd decades(8.6%), the 2nd decades(5.7%), and 8th decades(2.9%). 3. In the signs and symptoms of nasoplatine duct cysts, 25.7% were swelling, 17.1% were swelling and tenderness, 20.0% were swelling and pain, and 37.2% were asymptom. 4. In the shape of nasopalatine duct cysts, 40.0% were round type, 48.6% were oval type, and 11.8% were heart type. In symmetry of the nasopalatine duct cysts to the median palatine surture, 85.7% were symmetry, 14.3% were asymmetry. 5. In the width of nasopalatine duct cysts, 11.4% were 6-l0㎜, 48.6% were 11-20㎜, 25.7% were 21-30㎜, and 14.3% were 31-40㎜. 6. In the periphery of nasopalatine duct cysts, 82.9% were distinct, 17.1% were relatively distinct. 7. In the change of root, 51.5% were intact, 17.1% were root divergence, 20.0% were root resorption, and 11.4% were root divergence and resorption.

• Resources Recycling
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• v.20 no.6
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• pp.50-55
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• 2011

Using ultrasonic irradiation, the separation and recovery of PV cell, made of silicon wafer, from PV module was carried out through selective decomposition of EVA used as an interlaminated binder. The ultrasonic cleaner of bath-type (Output: 130 W, Frequency: 40 kHz) was used as an ultrasonic apparatus in this research. With the fixed distance of 2 cm, from ultrasonic generator to PV cell, the experiment of EVA decomposition was performed in various organic solvents such as Toluene, Trichloroethylene, O-dichlorobenzene, Benzene. And also their concentrations and temperature was changed to survey the optimum conditions. However EVA can be decomposed perfectly at $55^{\circ}C$ within 160 min in 5 M of all kinds of solvent, PV cell may be recovered with being damaged or broken severely. This damage may be resulted from the swelling of EVA in the process of decomposition. Whereas, at the condition of 5 M at $65^{\circ}C$, PV cell can be recovered with the state of minor damage or crack. This implies that the decomposition rate of EVA increases with an increase of temperature, thereby EVA can be decomposed before the swelling of EVA layer. Conclusively, it is possible for PV cell to be recovered within 40 min, at $65^{\circ}C$ in 5 M, with less damage.