In this study, an unbraced five-story steel-framed structure was designed in accordance with KBC2005 to understand the features of structural behavior for the arrangement of semi-rigid connections. An inelastic time history analysis of structural models was performed, wherein all the connections were idealized as fully rigid and semi-rigid. Additionally, horizontal and vertical arrangements of semi-rigid connections were used for the models. A fiber model was utilized for the moment-curvature relationship of a steel beam and a column, a three-parameter power model for the moment-rotation angle of the semi-rigid connection, and a three-parameter model for the hysteretic behavior of a steel beam, column, and connection. The base-shear force, top displacement, story drift, required ductility for the connection, maximum bending moment of the column, beam, and connection, and distribution of the plastic hinge were investigated using four earthquake excitations with peak ground acceleration for a mean return period of 2,400 years and for the maximum base-shear force in the pushover analysis of a 5% story drift. The maximum base-shear force and story drift decreased with the outer vertical distribution of the semi-rigid connection, and the required ductility for the connection decreased with the higher horizontal distribution of the semi-rigid connection. The location of the maximum story drift differed in the pushover analysis and the time history analysis, and the magnitude was overestimated in the pushover analysis. The outer vertical distribution of the semi-rigid connection was recommended for the base-shear force, story drift, and required ductility for the connection.
The ameloblastoma is the most common form of the odontogenic tumors exhibiting minimal inductive change in connective tissue, it comprising 1% of all tumor and cysts of the jaws. It is a true neoplasm, generally considered to be a benign but persistent or, locally malignant lesion. The tumor occurs most commonly in persons between the age of 20 and 50 years. 80% and 90% of all lesions are in the mandible. The presenting clinical signs and symptoms of the ameloblastoma very from patient to patient, but most common symptom was swelling, followed by pain, draining sinuses, and superficial ulcerations. It is slow-growing lesion, and the radiographic features of the ameloblastoma depend large one the nature and the local bone reaction to the particular tumor. Recurrence rate is about 33%, but this is probably due to incommplete initial removal of lesion. We had operated a patient ; 29-year-old female immediate reconstruction combined with autocompression plate and iliac bone graft and screw fixation after hemimandibulaectomy with recurred ameloblastoma involving from premolar to ascending ramus at right side mandible. We obtained favorable results of good function, short intermaxillary fixation periods and easy operation precedure than the other reconstruction methods.
Purpose: This study was designed for identification of the main clinicopathological features of cysts in the oral and maxillofacial regions. Methods: A retrospective observational study was conducted on 164 patients who had been diagnosed with cyst of the jaw, from the database of 168 histopathological diagnoses at the Department of Oral and Maxillofacial Surgery of Busan Paik Hospital at Inje University, from January 2009 to December 2011. The subjects were treated and the following variables were recorded: gender, age, clinical signs and symptoms, histopathological distribution, treatment methods, and complications. A descriptive analysis of the study variables was performed using a chi-square test. Results: Among the 164 patients, there were more male than female patients (male-female ratio: 1.7:1). The most predominant ages were the 20s and 40s. Among the classes of pathological cysts, radicular cysts and dentigerous cysts were the most common, with incidences of 56.0% and 35.1%. Thirty-six percent of the patients had no symptoms; and of those who had symptoms, the main signs and symptoms were swelling (24.4%) and pain (17.1%). The most frequent management method was the combination operation, such as enucleation with or without extraction and apicoectomy of the causative teeth. Of the 164 patients, 13 had complications; and one patient who had been treated with enucleation with apicoectomy had a recurrent cyst. Conclusion: Using a chi-square test, no significant differences in prevalence were observed in relation to gender according to age. Comparative analysis of radicular and dentigerous cysts showed a significant difference in their prevalence according to their anatomical location, however, no significant differences in were observed in their incidence rates according to age.
Kim, Jong-Yub;Kim, Kyung-Wook;Lee, Jae-Hoon;Kim, Chang-Jin
Maxillofacial Plastic and Reconstructive Surgery
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v.21
no.2
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pp.139-148
/
1999
Oral cancer is a common neoplasm in humans and etiologic mechanism is not well known, so treatment and evaluation of oral cancer is difficult problem. Traditional TNM classification between prognosis of tumors and classification of histopathologic differentiation has problem like lack of objectivity through operators. In molecular biology, cancer is developed by alteration of activation of oncogene and/or inactivation of tumor suppressor gene. The p53 gene, one of the tumor suppresor genes, is believed to play an important role through mutation and overexpression in the progression of human cancers. The p53 mutation is most frequent genetic disorder in humans. The Cyclin D1 has tumor suppresion activity by regulation of cell cycle. The Cyclin D1 regulate activity of Rb tumor suppresor gene by stimulation of CDK4 The purpose of this study was to observe the expression of p53 protein and Cyclin D1 in oral squamous cell carcinoma, and to get expectation of the malignancy and prognosis of oral squamous cell carcinoma. Using the 15 cases of squamous cell carcinoma and the microscopic H&E and immunohistochemical stain. We divided it into 3 groups according to the stain extent, clinical stage and histologic differentiation. The results were as follows1.In the features of immunohistochemical stain of 15 cases of squamous cell carcinoma, positive reaction of p53 was identified in 8 cases (53.3%) and positive reaction of cyclin D1 was identified in 3 cases (20%). Both positive reaction of p53 protein and Cyclin D1 was show in only one case. 2.8 of p53 positive cases were linked in 87.5% of the end stage tumor, 62.5% of neck node involvement, 87.5% of poorly and moderately histopathplogic differentiation. 3. All 3 of Cyclin D1 positive cases were linked in the end stage tumor, neck node involvement, poorly and moderately histopathologic differentiation. From above results, expression of p53 protein was identified in 53.3% of 15 cases and these results mean oral squamous cell carcinoma was drived by mutation of p53 protein. Especially, highly positive reaction of p53 protein and Cyclin D1 was identified in cases that involvement of neck lymph node and the end stage tumors and it means that the evaluation of p53 protein and Cyclin D1 was useful for evaluation of malignant tumor as specific tumor marker.
Angiogenesis is important for the growth and metastasis of solid tumors. Some growth factors, inflammatory cytokines, and angiogenin are known to promote tumor angiogenesis. Among them, Vascular endothelial growth factor (VEGF) is the most intriguing factor in regard to tumor angiogenesis. Inhibition of VEGF activity by neutralizing antibodies or by the introduction of dominant negative VEGF receptors into endothelial cells of tumor-associated blood vessels resulted in the inhibition of tumor growth and in tumor regression, indicating that VEGF is a major initiator of tumor angiogenesis. VEGF promotes angiogenesis through their receptors, Flt-1 and Flk-1/KDR. on vascular endothelial cells. These two receptors were usually believed to be expressed specifically on vascular endothelial cell. Several reports have now shown that VEGF is not only significantly associated with microvessel density but also has prognostic value in both node-negative and node-positive oral squamous cell carcinoma. For many years several histologic features of the neoplasms are being considered when assessing the influence of malignancy grading on recurrence and prognosis. Among the characteristics investigated, degree of keratinization, nuclear pleomorphism, mode of invasion, microscopic depth of invasion, intravascular invasion, lymphocyte infiltration, and number of mitoses have been considered as important prognostic factors. So, this study was conducted to evaluate the correlation of vascular endothelial growth factor expression with malignancy in paraffin-embedded biopsy specimens from 11 patients with tongue cancers. Our results showed that high immunoreactivity specimens of VEGF expression were significantly lower keratinization degree and more pronounced nuclear pleomorphism than in low immunoreactivity specimens. Thus, VEGF expression could be used as a prognostic marker in tongue cancer.
Oral squamous cell carcinoma is the most prevalent oral cancer, which is characterized by its high metastasis and recurrent rates and poor prognosis. Taxol is an anticancer agent which is microbial products extracted from jew tree. It combines with the tubulin and induces apoptosis by inhibiting mitosis of cell with microtubule stabilization. Recently, it was reported to be effective in various solid tumors, but only very slight effect has been seen in oral squamous cell carcinomas due to its cell-specific potencies. Cyclosporin A is used as immune suppressant and is being applied in anticancer therapy as its mechanism of induction of change of apoptotic process in various cells have been known. In this study, oral squamous cell carcinoma HN22 cell line was used for in vitro experiment and as for the experimental group taxol and cyclosporin A were applied alone and to observe the synergistic effect of apoptosis, Taxol and cyclosporin A were coadministered with different concentration of taxol for comparison. The results were obtained as follow: 1. There was no difference in Bcl-2, Bax, caspase 3, 8, 9 mRNA expression when cyclosprin A or taxol was applied alone to HN 22 cell line. 2. Caspase 3, 9 mRNA expression was prominently increased when cyclosprin A and taxol were applied together to cancer cell. 3. No significant difference was observed when cyclosporin A and taxol($1{\mu}g/ml$ and $3{\mu}g/ml$) were applied together to cancer cell line. 4. No significant difference was seen in Bcl-2, Bax, and caspase 8 mRNA expression in all the groups of in vitro experiments. 5. When cyclosporin A was applied alone in vivo study on the nude mice, histopathologi cal findings was similar to those of the control group. Oral squamous cell carcinoma induced by inoculation of HN 22 cell line was not reduced after treatment of cyclosporin A. 6. When taxol was applied alone, the islands of squamous cell carcinoma still remained, which meant insignificant healing effect. There was a lesser volume increase compared with the cyclosporin A alone. 7. When taxol and cyclosporin A were applied together, the connective tissue and calcification were seen in the histopathologic findings. Oral squamous cell carcinoma was decreased and cancer cell was disappeared. In observing the tumor mass change with time, there was a gradual decreased size and healing features. As the results of the in vitro experiment, it could conclud that only when the two agents are applied together, mitochondria-mediated apoptosis occurred by considerable increase of caspase 3, 9 mRNA expression, irrespectable of the concentration of taxol. In vivo experiment, there was a discrete synergistic effect when the two agents were applied together. But single use of cyclosporin A was not effective in this study. Based on the results of this experiment, if further clinical studies are done, taxol and cyclosporin A could be effectively used in treatment of oral squamous cell carcinomas.
The objectives of this study was to explore the growth pattern of the oral squamous cell carcinoma when overexpressed COX was inhibited, explore the pathway that COX inhibitors suppressed the proliferation of cancer cells, and then hereafter investigate the potential of COX as chemopreventive target for oral squamous cell carcinoma. For confirming the COX-dependent effect and mechanisms on growth of the oral cancer cells, we treated the nonselective NSAID, Mefenamic acid and COX-2 selective inhibitor, Celecoxib in HN4 cell line. And then the cell line was evaluated with MTT assay and growth curve, the production of PGE2, total RNA extraction and RT-PCR analysis, and TEM The results were obtained as follows: 1. After administration of medication, in the result of MTT assay, Celecoxib inoculated group inhibit the cell growth rather than Mefenamic acid inoculated group. 2. The growth curve of cell line showed as time passes by there was a dramatic cell growth in the control group, and gradual growth inhibition was found in medication inoculated group and, in Celecoxib inoculated group there was more inhibition of cell growth. 3. After the administration of medication, Celecoxib tend to inhibit the synthesis of PGE2 more than Mefenamic acid. Mefenamic acid inhibit the synthesis of PGE2 more as the concentration gets high, but Celecoxib inhibited the synthesis of PGE2 even in low concentration. 4. After the administration of medication, the revelation of COX mRNA in cell line, there was a 50% decrease in COX-1, 60% decrease in COX-2 as in $50{\mu}M$ Mefenamic acid, and in Celecoxib $50{\mu}M$ there was not much difference in COX-1 and 90% decrease in COX-2 was found. 5. HN4 cell line showed broken nucleus and tangled cytoskeleton bundles in cytoplasm which meant apoptotic features after the treatment of Celecoxib in TEM view. Depending on the above results, we estimate that the inhibition of the expression of COX-2 cause the growth suppression of the oral squamous cell carcinoma, and it get achieved through pathway of reduced PGE2 production and increased apoptosis. In addition to, because COX-2 selective inhibitor specifically act to COX-2, it is considered that COX-2 selective inhibitor has the adequate potential as chemopreventive agent for oral squamous cell carcinoma.
Journal of the Korean Society of Marine Environment & Safety
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v.18
no.2
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pp.167-174
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2012
Transport of marine debris between countries is a potential source of diplomatic conflicts. U-i Island in Shinan County, Jeonnam Province has been reported by media as being damaged by marine debris from foreign countries. However, scientific researches on those marine debris have not been published. So, the features of foreign marine debris on Seongchon Beach in U-i Island were surveyed on Feb. 2012. The ratio of marine debris from foreign countries was 34.7% by number of items, 56.3% by weight, and 48.5% by volume in $200m^2$ transacts. Most of them, 98.9% in number, were inferred to be originated from China. The most abundant items were plastic beverage bottles and black floats. The total number of black floats was 539 within the 1,100m beach. Fifteen of them had information on manufactured locations, of which 87.6% were Liaoning Province in northern China. As domestic policy cannot prevent the inflow of the marine debris from foreign countries, countermeasures should be sought out from the international cooperation with the neighboring countries. For the black floats, recycling method should be developed as lots of the same types of black floats are drifted ashore in winter. And, as the U-i Island is a National Park with its valuable natural heritages, methods should be designed to minimize impacts on dune topography and ecology.
Journal of the korean academy of Pediatric Dentistry
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v.29
no.1
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pp.44-50
/
2002
Apert syndrome is a kind of congenital-acrocephalosyndactyly syndrome which was first reported by Apert in 1906 and characterized by its acrocephaly and syndactyly. Clinical characteristic features are cone-shaped skull morphology due to early fusion of coronal suture, fusion of fingers of hands and toes of feet. It is an autosomal dominant-heritable syndrome. Due to hypo-development of midface region, Apert syndrome patients have a tendency to have ocular proptosis, hypertelorism, maxillary deficiency. High palate and soft palate cleft are common findings in these patients. In general, mandibular growth pattern is normal, but relative maxillary deficiency exaggerates mandibular forward position, so relative mandibular prognathism is inevitable. Narrow maxillary and mandibular dental arch worsen teeth alignment and crowding. Skeletal malocclusion and open bite are also common. This is a case report of a Korean 3 year 1 month male Apert syndrome child referred by department of plastic surgeon for the possibility of orthodontic treatment. General features of Apert syndrome, patient's medical history, radiographic evaluation, clinical examination, orthodontic and surgical treatment planning are discussed in this report.
Journal of the Korean Institute of Electrical and Electronic Material Engineers
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v.28
no.5
/
pp.344-349
/
2015
A new information society of late has arrived by the rapid development of various information & communications technologies. Accordingly, mobile devices which are light and thin, easy and convenient to carry on the market. Also, the requirements for the larger television sets such as fast response speed, low-cost electric power, wider visual angle display are sufficiently satisfied. The currently most widely studied display material, the Organic Light-emitting Diodes(OLEDs) overwhelms the Liquid Crystal Display(LCD), the main occupier of the market. This new material features a response speed of more than a thousand times faster, no need of backlight, a low driving voltage, and no limit of view angle. And the OLEDs has high luminance efficiency and excellent durability and environment resistance, quite different from the inorganic LED light source. The OLEDs with simple device structure and easy produce can be manufactured in various shapes such as a point light source, a linear light source, a surface light source. This will surely dominate the market for the next generation lighting and display device. The new display utilizes not the glass substrate but the plastic one, resulting in the thin and flexible substrate that can be curved and flattened out as needed. In this paper, OLEDs device was produced by changing thickness of Teflon-AF of hole injection material layer. And as for the electrical properties, the four layer device of ITO/TPD/$Alq_3$/BCP/LiF/Al and the five layer device of ITO/Teflon AF/TPD/$Alq_3$/BCP/Lif/Al were studied experimentally.
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