Despite optimal local therapy such as surgery and/or radiotherapy, the long term outcome is poor for patients with advanced squamous cell carcinomma of head and neck, due to frequent loco-regional recurrence and distant metastases. We studied to determine whether the combination chemotherapy, especially as an adjuvant chemotherapy, would improve the survival of these patients. Between January, 1986 and December, 1992, 57 patients with previously untreated, locally advanced squamous cell arcinoma of head and neck were assigned to receive 2-3 cycles of induction chemotherapy consisting of 5-fluorouracil(F) and cisplatin(P) every 3 weeks and standard local therapy such as surgery and/or radiotherapy followed by adjuvant chemotherapy with the same FP regimens. Of the 57 enroled patients, 45 patients were evaluable. The obtained results were as following: 1) Among 45 evaluable patients, 18 patients finished all treatment protocol including adjuvant chemotherapy and 27 patients had no adjuvant chemotherapy. The difference of age, sex, performance status, disease stage, and tumor differentiation was not significant statistically between adjuvant chemotherapy group and no-adjuvant chemotherapy group. 2) After induction chemotherapy, 7/45(15.4%), 30/45(67%) achieved complete remission and partial remission respectively with 82.4% overall response rates in entire patients. 3) The 4year progression free survival was 43.3% in adjuvant chemotherapy group and 24.1% in no-adjuvant chemotherapy group(p>0.05). The 4year overall survival was 56.9% and 25.5% respectively(p>0.05). There was no significant different in the patterns of local recurrence and distant metastasis between the two groups. 4) Adverse reactions from combination chemotherapy included nausea, vomiting, mucositis, diarrhea and hematologic bone marrow depression. These were mild and tolerated by patients, and these was no episode of any life threatening toxicities. In conclusion, adjuvant chemotherapy after induction chemotherapy and local therapy did not show statistically significant survival improvement, but there was trend of prolongation of survival when compared to no adjuvant chemotherapy. Thus, large scale phase III randomized controlled studies are strongly recommended.
Park, Bong-Wook;Byun, June-Ho;Choi, Mun-Jeoung;Hah, Young-Sool;Kim, Deok-Ryong;Cho, Yeong-Cheol;Sung, Iel-Yong;Kim, Jong-Ryoul
Maxillofacial Plastic and Reconstructive Surgery
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v.29
no.4
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pp.279-288
/
2007
In the present study, we focused on stem cells in the dental papilla of the tooth germ. The tooth germ, sometimes called the tooth bud, is the primordial structure from which a tooth is formed. The tooth germ consists of the enamel organ, the dental papilla, and the dental follicle. The dental papilla lies below a cellular aggregation of the enamel organ. Mesenchymal cells within the dental papilla are responsible for formation of dentin and pulp of a tooth. Tooth germ disappears as a tooth is formed, but that of a third molar stays in the jawbone of a human until the age of 10 to 16, because third molars grow slowly. Impacted third molar tooth germs from young adults are sometimes extracted for orthodontic treatment. In the present study, we evaluated the osteogenic activity and mineralization of cultured human dental papilla-derived cells. Dental papillas were harvested from mandible during surgical extraction of lower impacted third molar from 3 patients aged 13-15 years. After passage 3, the dental papilla-derived cells were trypsinized and subsequently suspended in the osteogenic induction DMEM medium supplemented with 10% fetal bovine serum, 50 g/ml L-ascorbic acid 2-phosphate, 10 nM dexamethasone and 10 mM -glycerophosphate at a density of $1\;{\times}10^6\;cells/dish$ in a 100-mm culture dish. The dental papilla-derived cells were then cultured for 6 weeks and the medium was changes every 3 days during the incubation period. Dental papilla-derived cells showed positive alkaline phosphatase (ALP) staining during 42 days of culture period. The formation of ALP stain showed its maximal manifestation at day 7 of culture period, then decreased in intensity during the culture period. ALP mRNA level was largely elevated at 1 weeks and gradually decreased with culture time. Osteocalcin mRNA expression appeared at day 14 in culture, after that its expression continuously increased in a time-dependent manner up to day 28. The expression remained constant thereafter. Runx2 expression appeared at day 7 with no detection thereafter. Von Kossa-positive mineralization nodules were first present at day 14 in culture followed by an increased number of positive nodules during the entire duration of the culture period. Osteocalcin secretion was detectable in the culture medium from 1 week. The secretion of osteocalcin from dental papilla-derived cells into the medium greatly increased after 3 weeks although it showed a shallow increase by then. In conclusion, our study showed that cultured human dental papilla-derived cells differentiated into active osteoblastic cells that were involved in synthesis of bone matrix and the subsequent mineralization of the matrix.
With the advanced localization followed by the settlement of the local autonomous systems, every city has faced new realities that it is inevitable to change its environment and image designs which have been uniformly made without consideration of its characteristics. Accordingly, they have failed to effectively achieve the development goal which make them distinctive.. The identity of a city means an image rather than its attribute. It can be drawn only when the city has its own municipality as well as the superiority to others. For Corporate Identity(CI) to function effectively as a comprehensive medium of communication, We should take into consideration all the situations which surround the city. It should be emphasized on the culture and environment oriented image. To do so we first of all have to analyze in detail the current situations and characteristics of the city. Hence, this paper tried to propose the strategies of making the CI which expresses the unique identity and communication of the city applying the CI program which have been used as the way of business management. The creation of the CI of the city takes the following steps. First, find the potentials for the image of the city through the survey of its resources. Second, provide the motive for citizens to actively participate in making plans with a dear vision for the improvement of the city image, physical development and so on. Third, provide with the events and the projects for specialized goods of the city to strengthen the ability of delivering the information, to design the city image and the street environment of the city. Fourth, apply the communication design system to use actively the administration organization, to enhance the citizenship, and to differentiate the city image. To do so, a variety of efforts should be followed to integrate and promote the regional culture, develope the structure and the facility functions of the city connecting those factors effectively. The establishment of the city identity is required a variety of activities to make the environment of the city, and the agreeable residential environment for a better life by differentiating the characteristics the city has.
Journal of the Economic Geographical Society of Korea
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v.17
no.3
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pp.502-516
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2014
This study has decomposed the Gini coefficient using Korean Labor & Income Panel Study data and empirically analyzed the impact of demographic characteristics and source-specific income of householder on the household income gap using panel analysis. The scope of areas were divided into 'nationwide,' 'metropolitan areas,' and 'non-metropolitan areas,' and the period before and after the global financial crisis was examined. The analysis findings are as follows. First, when the entire period was examined by income source using Gini decomposition with division of areas into 'nationwide,' 'metropolitan areas,' and 'non-metropolitan areas', the following results were revealed. The absolute and relative contribution level of property income to the gross income was the largest in the category of 'nationwide' and 'metropolitan areas,' while the contribution level of earned income was the largest in the category of 'non-metropolitan areas'. In addition, property income worsened the household income gap the most in the category of 'nationwide' and 'metropolitan areas.' Second, property income worsened the household income gap less after the financial crisis than before the crisis. It is probably because the price of real estate skyrocketed before the global financial crisis, worsening the household income gap, whereas the price drop after the crisis temporarily alleviated the gap. Third, a correlation analysis revealed that households with older householders whose education is high school graduation or below had relatively low gross income, and households with higher source-specific income, especially earned income, had relatively high gross income. Fourth, when the household income determinants were compared through panel analysis with division of areas into 'nationwide,' 'metropolitan areas,' and 'non-metropolitan areas,' the following results were obtained. While the impact of earned income, financial income, and other incomes was greater in non-metropolitan areas than in metropolitan areas, the impact of property income was greater in metropolitan areas than in non-metropolitan areas. To reduce the income gap, the government should impose higher taxes on the high-income class and provide tax benefits to the low-income class, with efforts to create a wide variety of jobs. In addition, since income inequality gets worse as the proportion of incomes generated through asset holdings becomes higher, the government should focus on stabilizing property prices while paying attention to the regional differentiation when carrying out related policies.
The aim of this study was to evaluate a usefulness of serum SCC antigen in diagnosis or evaluation of therapeutic effect of lung cancer by investigation of the differences of SCC antigen concentration in lung mass according to TNM staging, and mass size of lung cancer. And the other aim was to know whether SCC antigen plays a role in infiltrative growth of lung cancer or not, comparing with concentration of epidermal growth factor receptor(EGFr) in tissue which is related with growth and differentiation of tumor cell. The results of this study were as follows. The concentration of SCC antigen in squamous cell carcinoma of lung(69${\pm}$25ng/ml) was higher than in unaffected lung tissue(34${\pm}$7ng /ml).(p<0.05). The concentration of SCC antigen was higher in squamous cell carcinoma (69${\pm}$25ng/ml) than in adenocarcinoma (35${\pm}$25ng/ml) (p<0.05), but the concentration of EGFr showed no any significant difference in both histological types. In small sized mass(<3cm in diameter) the concentration of SCC antigen in central portion of tumor was higher than that of peripheral portion, whereas in large sized mass($\geq$5cm in diameter), the concentration of SCC antigen in peripheral portion of tumor was higher than that of central portion.(p<0.05). The concentration of EGFr according to tumor size was not significantly different in central and peripheral portion of tumor. The concentration of SCC antigen according to TNM staging of lung cancer was that from central portion was higher in stage I, II, but that from peripheral portion was higher in stage III, IV (p<0.05). The concentration of EGFr from central portion was higher in higher TNM stage(not significant) but that from peripheral portion shows no significant changes. In conclusion, the concentration of SCC antigen in tissue was higher in squamous cell carcinoma than in unaffected lung tissue or adenocarcinoma, and the concentration of SCC antigen increased according to tumor size or TNM staging like in serum level. so, serum SCC antigen is a useful tumor marker to diagnose or evaluate therapeutic effect of squamous cell carcinoma of lung. But further studies are necessary to confirm the relation of infiltrative growth in lung cancer and concentration of SCC antigen because there was a different pattern of regional tissue concentration of SCC antigen and EGFr
This thesis pursued exchanges of Hwangsang with Chusa Family, who existed in the 19th century. What was Chusa to Hwangsang and what was Hwangsang to Chusa? The answer is concluded to the question of which existence Chusa was to Hwangsang but not of which existence Hwangsang was to Chusa. However, disregarding social positions of the nobles and the commoners, brothers of Chusa also cherished Hwangsang and respectfully treated him as a poet at all times. Chusa was a critic who recognized Hwangsang as a successor to Dasan poetics and became a patron of the literary circles on the other hand. Hwangsang's Chinese poems related to Chusa Family are counted as 45 JE 52 SU in total which consist of 31 JE 34 SU in "CHIWONYUGO" and 14 JE 18 SU in "CHIWONSOGO", On the other hand, Chinese poems which Chusa wrote for Hwangsang are only a few pieces shown in "WANDANGJEONJIP". Hwangsang first met three brothers including Chusa in September 1853 when he came up to the capital for the 4th time. Jeong Hak-yeon, the oldest son of Dasan Jeang Yak-yong, played an important role in the whole process that Hwangsang met Chusa's three brothers and was recognized as a poet. As the oldest son of Dasan Family, Jeong Hak-yeon made efforts in various ways for Hwangsang. Hwangsang tried his efforts to exhibit his ability as a poet to Chusa and to get Chusa's introduction of his poetical works. Considering Chusa's importance in then literary circles, the introduction seemed to reflect recognition by the literary circles in the metropolis and it also showed that Hwangsang was no more than an obscure poet in the provincial area. Poetical composition of Hwangsang for Chusa three brothers commonly contained friendship, intimacy and special respect at all times. Seeing from exchange process between Hwangsang and Dasan Family or Chusa Family, it is found that mutual exchanges were actively made in the mid-nineteenth century overcoming regional differentiation between capital and province, or feudalism class distinction of social positions of the nobles and the commoners.
This study tried to propose a smart farm technology strategy suitable for the domestic situation, focusing on the differentiation suitable for the domestic situation of ICT technology. In the case of advanced countries in the overseas agricultural industry, it was confirmed that they focused on the development of a specific stage that reflected the geographical characteristics of each country, the characteristics of the agricultural industry, and the characteristics of the people's demand. Confirmed that no enemy development is being performed. Therefore, in response to problems such as a rapid decrease in the domestic rural population, aging population, loss of agricultural price competitiveness, increase in fallow land, and decrease in use rate of arable land, this study aims to develop smart farm ICT technology in the future to create quality agricultural products and have price competitiveness. It was suggested that the smart farm should be promoted by paying attention to the excellent performance, ease of use due to the aging of the labor force, and economic feasibility suitable for a small business scale. First, in terms of economic feasibility, the ICT technology is configured by selecting only the functions necessary for the small farm household (primary) business environment, and the smooth communication system with these is applied to the ICT technology to gradually update the functions required by the actual farmhouse. suggested that it may contribute to the reduction. Second, in terms of performance, it is suggested that the operation accuracy can be increased if attention is paid to improving the communication function of ICT, such as adjusting the difficulty of big data suitable for the aging population in Korea, using a language suitable for them, and setting an algorithm that reflects their prediction tendencies. Third, the level of ease of use. Smart farms based on ICT technology for the development of the Industry6.0 (1.0(Agriculture, Forestry) + 2.0(Agricultural and Water & Water Processing) + 3.0 (Service, Rural Experience, SCM)) perform operations according to specific commands, finally suggested that ease of use can be promoted by presetting and standardizing devices based on big data configuration customized for each regional environment.
The field of Management of Technology(MOT) emerged in response to the need for research management within U.S. public research institutions during the 1960s. Since its inception, it has proliferated significantly, being practiced in more than 809 institutions globally and over 19 institutions in Korea, encompassing both research and educational endeavors. Particularly noteworthy is the substantial investment of government resources, primarily channeled through the Ministry of Industry since 2007, which has expeditiously established a comprehensive framework for cultivating graduate-level MOT expertise, marked by both quantitative and qualitative advancements. The educational curriculum in the realm of Korean MOT deviates from foreign counterparts through distinctive pathways, exemplified by its emphasis on industry practice-oriented educational programs, standardization and isomorphism across different schools, as well as its interconnectedness with proximate academic disciplines. This research systematically undertakes an analysis of the curriculum in Korean MOT graduate schools, thereby ascertaining its intrinsic identity and distinct attributes. In this endeavor, a comprehensive examination of eleven principal MOT textbooks(three in Korean and eight in English) is conducted to delineate the primary content of the curriculum across seven thematic domains. Moreover, the study deliberates on its differentiation from neighboring academic disciplines and the definitional attributes of MOT. Subsequently, this analysis also encompasses nine Korean MOT graduate programs, projecting the seven thematic domains onto their respective curricula. The findings illuminate that within the context of Korean graduate programs, a substantial proportion of the curriculum, amounting to 62.5%, is dedicated to facets encompassing the operational aspects of technology management within corporate contexts, technology management specific to varying industries and technologies, and collaborative endeavors between academia and industry in the form of projects and seminars. Evidently, the Korean approach to technology management education is notably geared towards the cultivation of adept practitioners capable of executing technology management functions at a mid-tier managerial level, aligned with the exigencies of regional industries. Grounded in the analysis of technology management curricula, this study extrapolates implications for the future trajectory of MOT education in Korea, encompassing a consideration of the stages of industrial development. It underscores the necessity to augment the educational curricula pertaining conceptual foundation of technology and innovation, strategic perspectives of technology and innovation, and the socio-economic context of technology management.
Purpose: The aim of this study was to evaluate the results of postoperative radiotherapy in a case of perihilar cholagiocarcinoma by analyzing overall survival rate, patterns of failure, prognostic factors for overall survival, and toxicity. Materials and Methods: Between January 1998 and March 2008, 38 patients with perihilar cholangiocarcinoma underwent a surgical resection and adjuvant radiotherapy. The median patient age was 59 years (range, 28 to 72 years), which included 23 men and 15 women. The extent of surgery was complete resection in 9 patients, microscopically positive margins in 25 patients, and a subtotal resection in 4 patients. The tumor bed and regional lymphatics initially received 45 Gy or 50 Gy, but was subsequently boosted to a total dose of 59.4 Gy or 60 Gy in incompletely resected patients. The median radiotherapy dose was 59.4 Gy. Concurrent chemotherapy was administered in 30 patients. The median follow-up period was 14 months (range, 6 to 45 months). Results: The 3-year overall survival and 3-year progression free survival rates were 30% and 8%, respectively. The median survival time was 28 months. A multivariate analysis showed that differentiation was the only significant factor for overall survival. The 3-year overall survival was 34% in R0 patients and 20% in R1 patients. No statistically significant differences in survival were found between the 2 groups (p=0.3067). The first site of failure was local in 18 patients (47%). No patient experienced grade 3 or higher acute toxicity and duodenal bleeding developed in 2 patients. Conclusion: Our results suggest that adjuvant RT might be a significant factor in patients with a positive margin following a radical resection. However, there was still a high locoregional recurrence rate following surgery and postoperative radiotherapy. Further study is necessary to enhance the effect of the adjuvant radiotherapy.
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