• Journal of Life Science
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• v.19 no.3
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• pp.327-333
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• 2009

Psoriasis is a well known disorder of keratinization. In this disease, several reports revealed that dermal micro vessels are increased and angiogenic factors such as vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) are over-expressed. Angiogenesis may play an important role in the progression of psoriasis. Acitretin is widely used as an anti-psoriatic drug because of its potent action on keratinocyte growth and differentiation, but its effects on angiogenesis are uncertain. The goal of this immunohistochemical study was to investigate the effects of acitretin on the expression of VEGF in psoriatic lesions of the skin. We compared the expression levels of VEGF between pre- and post-acitretin treated skin - 10 psoriatic skin lesions and 3 normal (control) skins. The expressions of VEGF in psoriatic skin lesions were significantly higher than in normal control skin. The expressions of VEGF in psoriatic skin lesions post-treatment were lower than those pre-treatment. Acitretin revealed inhibitory effects on angiogenesis by reducing the expression of angiogenic factors such as VEGF in psoriatic skin lesions. We suggest that acitretin may be useful in therapeutic approaches to psoriasis management, possibly related to angiogenesis.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.5
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• pp.12-19
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• 2016

An average of 20 million individual transit unit activities per day on the Seoul-Gyeonggi-Incheon public transportation network are provided as transportation card analysis data by the metropolitan district (99.02% by 2014 standard, Humanlive, 2015.4). The metropolitan transportation card data can be employed in a comprehensive analysis of public transportation users' current transit patterns and by means of this, an effective use plan can be explored. In enhancing the existing information on the bus and rail integrated network of the metropolis with public transportation card data, the constraints in the existing methodology of metropolitan transit analysis, which functions on a zone unit origin and destination basis, can be overcome. Framework for metropolitan public transportation card data based integrated public transportation analysis, which consists of bus and rail integrated transport modes, is constructed, and through this, a single passenger's transit behavior transit volume can be approximated. This research proposes that in the use of metropolitan public transportation card data, integrated public transportation usage, as a part of individual passenger spatial movements, can be analyzed. Furthermore, metropolitan public transportation card usage data can provide insights into understanding not only movements of populations taking on transit activities, but also, characteristics of metropolitan local space.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.2
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• pp.471-492
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• 2017

The demand and interest in big data analytics are increasing rapidly. The concepts around big data include not only existing structured data, but also various kinds of unstructured data such as text, images, videos, and logs. Among the various types of unstructured data, text data have gained particular attention because it is the most representative method to describe and deliver information. Text analysis is generally performed in the following order: document collection, parsing and filtering, structuring, frequency analysis, and similarity analysis. The results of the analysis can be displayed through word cloud, word network, topic modeling, document classification, and semantic analysis. Notably, there is an increasing demand to identify trending topics from the rapidly increasing text data generated through various social media. Thus, research on and applications of topic modeling have been actively carried out in various fields since topic modeling is able to extract the core topics from a huge amount of unstructured text documents and provide the document groups for each different topic. In this paper, we review the major techniques and research trends of text analysis. Further, we also introduce some cases of applications that solve the problems in various fields by using topic modeling.

• Culinary science and hospitality research
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• v.18 no.3
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• pp.1-17
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• 2012

This study was planned for an empirical review of foodservice operation in expressway rest areas for a menu strategy targeting staff and customers. The results were as follows. Main foodservice category included 10-30 items of Korean dishes. The needs for having branded foodservice menu in rest areas were high in fusion/fast foods, snack/ready-made and beverages. Employment of professional cooks in rest areas was low (10-30%), and the most important factor was 'taste' when cooking Korean foods. Foreigners preferred fusion/fast foods and snack/ready-made foods to Korean food, beverages and Japanese/Chinese foods, and most of the foreigners ordered food with 'no question'(55.5%) or 'some questions'(34.8%). Rest area staff prepared some photos/pictures of foods (80-100%) for menu comprehension, but the accuracy of menu transcription was very low. Customers used a rest area once or twice, stayed for 10-20 min(43.6%)/20-30 min(38.6%), visited by car(77.7%) to relax and use toilets(61.6%) on average. Favorite food and snacks were Korean(32.7%) and ready made/snacks(33.0%), and they spent 5,000-10,000 won(51.3%), 3,000-5,000 won(25.8%) on them. Customer satisfaction with rest areas was 'average' regardless of gender, age, education levels and jobs. With this analysis, we should prepare an efficient menu strategy for customer satisfaction and plans for analyzing problems along with alternatives.

• Journal of Korean Society of Forest Science
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• v.107 no.2
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• pp.218-228
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• 2018

This study was carried out to investigate the recognition and requirements of mountain eco-tourism by surveying mountain villages'visitors. As a feasibility study to introduce new eco-tourism policies, the individual interview survey was conducted from June 17, 2015 to September 17, 2015 targeting 439 visitors in 57 mountain villages, where the Korea Forest Service designated them as mountain eco-villages and the Ministry of Agriculture, Food and Rural Affairs has been operating the rural experience and recreation village business. As a result of the major analysis, the respondents'intention to participate in mountain eco-tourism was 3.65 by Likert 5-point-scale and the respondent's most preferred the number of visits was once a year(44.6%) or twice a year(30.1%). Also, the most preferred region was Gangwon-do(44.8%) and the average amount of expense willing to pay was 153,320 won. Lastly, the respondents said they expect development of regional tourism product(M=3.99) and mountain eco-tourism program(M=3.96) by requirements for mountain eco-tourism. This result shows that it is necessary to inspire public awareness regarding the value of mountain eco-tourism and to develop new policies or programs making people more attracted to mountain villages. Thus, it means that mountain eco-tourism can be utilized as a way to steer sustainable mountain village.

• Korean Journal of Social Welfare
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• v.54
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• pp.177-201
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• 2003

Gambling is prevailing in our society and the family problems of gamblers are also serious. In order to reduce the problems of gamblers and their families, the basic research on gambling would be the first step. In light of this, this study is a survey which has two objectives: to grasp the overall conditions of gambling and the proportion of pathological gamblers; to find the differences between the pathological gamblers' group and the general group in terms of various aspects of family relations in Choongchung area. The findings of this study is as follows, The respondents tend to gamble most with korean playing cards, either in winter or regardless of seasons. They tend to gamble most with family members, relatives, or friends. About 20% of them gamble more often than once a month, and 60% started gambling in their twenties or thirties. The proportion of pathological gamblers was found to be 11.6% of the sample of this study, with men and rural area residents to be significantly more than women and urban area residents. In the various aspects of family lives, such as marital satisfaction, family relations, family violence, family history of addiction, how to spend leisure time with family, it was found that the pathological gamblers' group has significantly more problems than the general group. On the basis of the above findings, the suggestions were made as follows. Firstly, the counter plan to gambling is necessary in the rural area, especially in winter time. secondly, positive leisure activities which substitute gambling needs to be developed, especially for men. Thirdly, family education and family therapy Program is required for the pathological gamblers and their families. Fourthly, governmental policy is necessary for the budget to prevent and treat gambling problems.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.1D
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• pp.7-15
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• 2011

The travel time value is important factor for the evaluation of feasibility the transportation facility investment. The existing method for calculation of the travel time for each mode uses daily average trip purpose. So the value of travel time is constant because it is estimated with only daily average proportion. This daily constant time value can distort the results of future demands of toll roads or economic appraisals for the projects. The proportion of the trip purpose varies by time periods. Accordingly the value of travel time also varies by time periods. In this study, times periods are classified as morning peak, evening peak, business time off-peak, and non-business time off-peak. And trip purpose proportions are sorted by each time period from raw data of Seoul household trip study, then the value of travel time for each time period is estimated with these sorted purpose proportions. A case study of Seoul Jung-gu and Yongsan-gu performed with newly estimated time value by time periods. The result of benefit calculation with the daily constant time value is overestimated approximately annual 2.5 billion Won compared by time values by time periods. The demands of toll roads are also overestimated with the existing daily constant time value by daily 3,500 vehicles and total revenue of toll roads are overestimated by annually 1 billion Won. In conclusion, the value of travel time by each time period enables the more precise economic evaluation of the transportation facility investment projects, mode choice behavior, and route choice behavior especially for toll roads.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.2
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• pp.69-73
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• 2016

Recently, automotive engineers have paid much attention to waste heat recovery technology as a possible means to improve the thermal efficiency of an automotive engine. A large displacement gasoline engine is generally a V-type engine. It is not cost effective to install two superheaters at each exhaust manifold for the heat recovery purposes. A single superheater could be installed as close to the exhaust manifold as possible for the higher recovery efficiency; however, only half of exhaust gas can be used for heat recovery. On the contrary, the exhaust temperature is decreased for the case where the superheater is installed at a junction of two exhaust tail pipes. With the fact in mind, the optimum position of a single superheater was investigated using simulation models developed from a commercial software package (i.e. AMESim). It was found that installing the superheater near the exhaust manifold could recover 3.8 kW more from the engine exhaust despite utilizing only half of the exhaust mass flow. Based on this result, the optimum layout of an automotive waste heat recovery system was developed and proposed in this paper.

• Journal of Bio-Environment Control
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• v.18 no.3
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• pp.266-272
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• 2009

This study was conducted survey on fruit and vegetables farms (FM), consulting companies (CC), and the consultants (CT) to investigation actual conditions and improvements in consulting part of horticulture. In results of survey on FM, FM chose 'necessity' on consulting for learning of production skill and 'field visit' in means of consulting. FM had a low trust on experience and knowledge of CT and answered that FM had not enough time for consulting by reason of over-work of CT, chose 'necessity' on crop registration system. In results of common questions among FM, CC, and CT, same answer of questions were term of contract (answer: yearly contract), means of consulting (answer: visit), consulting time per a visit (answer: $2{\sim}3$hours). Different answer between supplier (CC, CT) and consumer of consulting were decision method of contract price (answer: provisional contract$\neq$contents and the quality of consulting), percentage of government subsidy (answer: propriety$\neq$step-up).

• Communications of Mathematical Education
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• v.27 no.3
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• pp.283-299
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• 2013

Mathematics textbooks based on storytelling in elementary schools started to apply a new method of teaching math to the first and second grade students from this year. By surveying the actual responses of both in-service and pre-service teachers, this study aimed to find out critical opinions to assist future math teachers. The survey was conducted among 124 in-service teachers and 112 pre-service teachers, asking what they needed for the understanding of the storytelling theory and for the preparation of actual lessons. After analyzing data, we concluded that in-service teachers have more positive opinion about the efficiency of teaching and learning mathematics based on storytelling, but more negative opinion about the appropriateness of storytelling as a means for teaching and learning mathematics than the pre-service teachers in elementary school. The in-service elementary teachers also want to have well-organized teaching resources for storytelling and development. Through a lot of training, more and more creative ways of applying the storytelling method can be learned and concrete presentations of real lessons need to be shared. Approximately 87% of pre-service teachers believe the storytelling method is a necessity in teaching math.