• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.05a
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• pp.321-327
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• 2008

Performance characteristics of the axi-symmetric supersonic exhaust diffuser (SED) with a second throat are numerically investigated. Computational strategy repeats those for a straight exhaust diffuser with zero-secondary flows. Renolds-Average Navier-Stokes equations with a standard ${\kappa}-{\varepsilon}$ turbulence model incorporated with standard wall function are solved to simulate the diffusing evolutions of the nozzle plume. The methodology is validated with accuracy. To predict the improvement of starting performance by second throat diffuser, diffuser characteristic curve due to the SED equipped with the second throat is speculated with respect to that of a straight area type as a function of nozzle stagnation pressure. Principal physics caused by the of the second throst is also addressed in terms of a second throat area ratio.

• Archives of Plastic Surgery
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• v.38 no.1
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• pp.63-68
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• 2011

Purpose: Mastectomy is one of the operative procedures of female to male transsexuals. It is aimed to excise all of breast tissues and to reconstruct male chest wall, areola, and nipple. Breast sizes are varied by developmental status and their hormonal therapy. There are several approaches for mastectomy. This study is aimed to suggest appropriate mastectomy methods according to breast size in the female to male transgenders. Methods: We retrospectively analysed 46 patients of female to male transgenders. Breast size was categorized by their inner wear size. In A cup size, mastectomy was done with periareolar approach. In C cup size, inframammary fold approach subcutaneous mastectomy was performed. In B cup size, periareolar approach was used for grade A or B ptosis patient, and inframammary fold approach was choosen for the patient with grade C ptosis. Results: Subcutaneous mastectomy was done through semicircular periareolar approach for 26 patients. There were 2 cases of major complications that should be corrected by hematoma evacuation. Circumareolar approach was used for 5 patients, and a case of nipple-areolar complex necrosis was observed. Two cases of another complications which were irregularity of breast and wound disruption could be corrected. Inframammary fold approach was selected for 15 patients. There was a case of wound disruption, so revision surgery whould be done. Four cases of breast irregularity was corrected spontaneously, and 2 cases of partial necrosis of nipple-areolar complex were corrected with secondary healing. Patient satisfaction score for periareolar, cicumareolar, and inframmammary fold approach were 4.5, 4.2 and 4.1, respectively. Some major and minor complications were observed, but satisfactory results could be secured. Conclusion: Semicircular periareolar incision looked adequate for A cup size patient, circumareolar incision was suitable for B cup size with grade A or B ptosis. In B cup size with grade C ptosis patient and C cup patients, inframammary fold incision looked suitable for optimal results.

• Journal of architectural history
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• v.21 no.6
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• pp.7-18
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• 2012

This study was aimed at analyzing the location and topology of the 'Gungmyo(宮廟)' and in Hanyang Doseong(漢陽都城) during 18th and 19th century. Based on the changes of royal processions(行幸) which had been done between the Gungmyo and the Palace, the Gungmyo can be a barometer of cognition where the city center was. Hanyang Doseong was the the capital of Joseon(朝鮮) which had established by king Taejo(太祖). The city had been organized with Gyeongbok-gung(景福宮) as the center. However, after the Imjin War(1592), Gyeongbok-gung was destroyed and urban space was reorganized with Changduk-gung(昌德宮) which reconstructed first. As most kings in late Joseon dynasty had mainly stayed in Changduk-gung, lots of Gungmyos where a memorial service for king's relatives had been held were established in and around the palace and the frequency of visiting the Gungmyo varied by political purpose. Therefore, the location of the Gungmyo and the rounte of parade were important to impress on the center of urban space. In 18th century, lots of King's procession had been done with Changduk-gung as departure point. The king used to start from Donwha-mun(敦化門), and the routes included main street around Changduk-gung. It shows that the urban center focused on the east of the city. On the other hand, when the king lived in Kyeonghee-gung(慶熙宮), a secondary palace in late Joseon dynasty, the parade started from Hungwha-mun(興化門) and the urban center was expended to the west. Since Gyeongbok-gung had reconstructed in 1865, recognition scheme of urban space had changed from Changduk-gung to Gyeongbok-gung as the center. When the Gungmyo relocated western side of Gyeongbok-gung, spatial proximity of the palace and relation with facilities around downtown fed into changing the route of king's parade.

• Archives of Plastic Surgery
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• v.33 no.2
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• pp.237-240
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• 2006

The simultaneous correction of the hypertelorism and exophthalmos combined with craniosynostosis is very rarely performed operative procedures in the world. The craniosynostosis is the congenital anomaly that designates premature fusion of one or more sutures in either cranial vault or cranial base. Hypertelorism is not a distinct clinical syndrome in itself, but is a physical finding secondary to facial and cranial maldevelopment and it is defined as a increase in the distance between the medial orbital walls. Exophthalmos can occur following the decrease in the size of the orbit in patients with developmental skeletal disorders such as craniofacial synostosis. The authors experienced 9-year-old male patient, who has complex cranio-facial abnormality. The craniosynostosis was oxycephaly type and primary fronto-orbital advancement surgery had been performed in other hospital. The abnormal cranial vault combined with hypertelorism and exophthalmos due to maldeveloped both orbital walls. Surgical correction was obtained by various cranio-fronto-orbital remodeling technique such as calvarial bone craniotomy, fronto-orbital advancement, paramedian resection, medial canthopexy, Tessier-Wolfe three wall orbital expansions. We achieved a quite satisfactory result both functionally and aesthetically in a complex cranio-facial deformity patient by combination and modification of previously developed various cranio-facial plasty technique and hereby report the case with brief discussion and review of literature.

• Tuberculosis and Respiratory Diseases
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• v.62 no.6
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• pp.531-535
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• 2007

The esophagus is a rate site for rarely involved site of tuberculosis. The most common cause of esophageal tuberculosis is secondary involvement from adjacent tuberculous lymphadenitis. Esophago-nodal or esophagobronchial fistulas may be formed when tuberculous lymph nodes erode the adjacent esophageal or bronchial wall. We report a patient diagnosed with esophageal tuberculosis, which was complicated by an esophago-mediastinal fistula, by endoscopy, sputum acid fast bacilli (AFB) stain, chest computed tomography (CT), and an esophagogram. The patient was treated with antituberculous agents and chest CT and endoscopy showed that the fistula had closed completely.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.32 no.4
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• pp.283-289
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• 2008

An experimental investigation was conducted to investigate the heat/mass transfer for impingement/effusion cooling system with inclined jet. Jets with inclined angle of 60 are applied to impingement/effusion cooling. At the jet Reynolds number of 10,000, the experiments were carried out for blowing ratios ranging from 0.0 to 1.5. The local heat/mass transfer coefficients on the effusion plate are measured using a naphthalene sublimation method. The result indicates that the inclined jet causes the non-uniform and low heat/mass transfer compared to the vertical jet. At stagnation region, the peak position is shifted from the geometrical center of injection hole due to Coanda effect and its level is higher than that of vertical jet due to increase in turbulence intensity by steep velocity gradient near the stagnation region. Further, the secondary peak region disappears because the interaction between adjacent wall jets weakens. When the initial crossflow occurs, the distorted heat/mass transfer pattern appears. As the blowing ratio (crossflow rate) increases, the heat/mass transfer distributions become similar to those of the vertical jet. This is because the effect of crossflow is dominant compared to that of inclined jet under high blowing ratio $(M{\geq}1.0)$. At low blowing ratio $(M{\leq}0.5)$, averaged Sh value is 10% lower than that of vertical jet, whereas its value at high blowing ratio $(M{\geq}1.0)$ is similar to that of vertical jet.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.05a
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• pp.59-62
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• 1996

Plasma displays (PDP) as a large area wall-hanging display device are rabidly developed with flat CRT, TPT LCD and etc. Especially, AC Plasma Display Panels(AC PDPs) have the inherent memory function which is effective for large area displays. The memory function in AC PDPs is caused by the accumulation of the electrical charge on the protecting layer formed on the dielectric layer. This MgO protective layer prevents the dielectric layer from sputtering by ion in discharge plasma and also has the additional important roll in lowering the firing voltage due to the large secondary electron emission coefficient). Until now, the MgO Protective layer is mainly formed by E-Beam evaporation. With increasing the panel size, this process is difficult to attain cost reduction, and are not suitable for large quantity of production. To the contrary, the methode of shuttering are easy to apply on mass production and to enlarge the size of the panel and shows the superior adhesion and uniformity of thin film. In this study, we have prepared MgO protective layer on AC PDP Cell by reactive magnetron sputtering and studied the effect of MgO layer on the surface discharge characteristics of ac PDP.

• The Plant Pathology Journal
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• v.28 no.4
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• pp.401-408
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• 2012

Initial subcellular responses in susceptible (PI 274420) and resistant (cv. Hartwig) soybeans infected with the soybean cyst nematode (SCN) were examined 2 and 4 days after inoculation (DAI). Subcellular features common to both soybeans at 2 DAI included hypertrophied initial syncytial cells (ISCs) and syncytium-component cells (SCs) with a dense cytoplasm containing proliferated rough and smooth endoplasmic reticulum (RER and SER), a hypertrophied nucleolus, and reduced vacuoles, suggesting that the nematode-infected cells were dedifferentiated. In the resistant soybean, a striking initial subcellular difference from the susceptible soybean was the dilation of the RER, indicating ER dysfunction and leading to cell death. This disturbed nematode feeding, as evidenced by disrupted feeding tubes. In PI 274420, the ISC cytoplasm was depleted, with the exception of ER membranes, at 4 DAI, while the SC cytoplasm was dense with proliferation of starch-containing plastids around multiple nuclei that might be derived from the congregation of nuclei in the neighboring SCs and in part by nuclear division without cytokinesis. In cv. Hartwig, syncytia were necrotized with secondary cell wall thickening outside the plasma membrane and an extremely dense cytoplasm containing a nucleus with an electron-lucent nucleolus, accompanied by the proliferation of closely stacked parallel RER and ribosomes. These results suggest that syncytia develop continuously in PI 274420 to produce and store nutritional substances in SCs, providing for the nematode through ISC until maturation, but in cv. Hartwig, syncytia degenerate early due to excessive metabolism, blocking nematode feeding and cytoplasmic connections with adjacent intact cells.

• The Plant Pathology Journal
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• v.20 no.2
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• pp.81-84
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• 2004

Branched broomrape (Orobanche ramosa) is a holo-parasitic flowering plant that attaches to the root of its host, green plant, by means of a specialized structure known as haustorium. Following successful contact and penetration on susceptible plant root, complex tissue of Orobanche cells is formed which is known as the tubercle. Newly formed tubercles contain high activity ofindole-3-acetic acid (IAA). Triiodobenzoic acid (TIBA), as an inhibitor of IAA polar transport, was utilized to investigate the supply and requirement of auxin to the developing O. ramosa on tomato plant. There was no significant reduction in the incidence of O. ramosa per pot of different TIBA treatments. However, infection severity in terms of the number of O. ramosa shoots that emerged per plant and number of attachments per plant root system were significantly reduced by 60 % and 45 % on TIBA treated plants, respectively. Histo-logical studies revealed conspicuous delay in the initiation of xylem vessel differentiation inside tubercles of the TIBA treated tomato plants. Also, differentiated vessels showed thinner secondary wall deposition, and improper alignment within bundles inside those tubercles. They were wider and shorter in diameter in comparison to those of untreated plants. These findings were attri-buted to the short supply of IAA required for normal development, and to the xylem vessel differentiation of O. ramosa tubercles on infected tomato. Hence, this parasitic flowering plant seems to depend upon its host in its requirements for IAA, in a source to sink relation-ship.

• Archives of Plastic Surgery
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• v.42 no.1
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• pp.46-51
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• 2015

Background In all branches of medicine, it is the surgeon's responsibility to provide the patient with accurate information before surgery. This is especially important in cosmetic surgery because the surgeon must focus on the aesthetic results desired by the patient. Methods An experimental protocol was developed based on an original questionnaire given to 72 patients. The nature of the responses, the patients' motivation and expectations, the degree of patient awareness regarding the planned operation, and the patients' perceptions of the purpose of the required consent for cosmetic surgery were all analyzed using Fisher's exact test. Results Candidates for abdominal wall surgery had significantly more preoperative psychological problems than their counterparts did (P=0.035). A significantly different percentage of patients under 40 years of age compared to those over 40 years of age searched for additional sources of information prior to the operation (P=0.046). Only 30% of patients with a lower educational background stated that the preoperative information had been adequate, whereas 92% of subjects with secondary schooling or a postsecondary degree felt that the information was sufficient (P=0.001). A statistically significant difference was also present between patients according to their educational background regarding expected improvements in their quality of life postoperatively (P=0.008). Conclusions This study suggests that patients require more attention in presurgical consultations and that clear communication should be prioritized to ensure that the surgeon understands the patient's expectations.