• The Transactions of the Korea Information Processing Society
• /
• v.7 no.4
• /
• pp.1217-1226
• /
• 2000

Traditionally, Mobile Teletraffic model consists of two sub-models, i.e. the network traffic model and the traffic source model. In this paper, we present the traffic source model by developing MobCall (Mobile Call Simulator) which analyses various mobile wireless environments based on regional characteristics that the base stations are located. User mobility is presented by regional average vehicle speeds and the transportation share rate. Moreover, the user mobility on subway, which is increasing in urban area, is considered in MobCall. And also, user's movements on highway are considered in MobCall. The object-oriented simulation platform, C++SIM, is used to implement MobCall. Using MobCall, the accumulated number of calls in residential and commercial regions, the handoff rate with respect to traffic sources of Seoul, the handoff rate on highway, and the handoff rate according to the call duration are presented. MobCall enables the simulation of dynamic handoff buffering and functional entity control of one base station according to the changes in user's calling pattern at the design phase. Also, when a new town is under construction by a detailed plan, MobCall is used to design the mobile network with regional characteristics and user mobility considered.

• Journal of Korean Society on Water Environment
• /
• v.23 no.6
• /
• pp.973-984
• /
• 2007

This study developed and calculated alternative evaluation index (AEI) from the effectiveness analyses of alternatives for rehabilitation of distorted hydrologic cycle. The feasible alternatives for the poor-conditioned region in the Anyangcheon watershed were proposed and quantitatively analyzed using continuous water quantity/quality simulation model, Hydrological Simulation Program-Fortran (HSPF). The effectiveness analyses include 355th flow and 275th flow of flow duration curve and number of increased days to satisfy the target monthly flow for water quantity and BOD average concentration, total daily loads and number of increased days to satisfy the target concentration and total daily loads. The feasible alternatives are restoration of covered stream, prevention of streamflow loss through sewers, redevelopment of existing reservoir, reuse of treated wastewater, use of groundwater collected by subway stations and construction of small wastewater treatment plant. Therefore, alternative priority ranking was derived from AEIs. It will be effective to make an integrated watershed management for sustainable development.

• Proceedings of the KOSOMBE Conference
• /
• v.1995 no.05
• /
• pp.179-182
• /
• 1995

Although air, water, and noise pollutions have been widely recognized, electromagnetic forces(EMF) hazard has been rarely recognized as a pollution and very little studies has been done in this country. Thus, in this study electromagnetic forces radiated by various home appliances, once machines, and communication equipments were measured and so were several places radiating strong EMF such as subway stations and electric substations. Among the home appliances microwave oven senates lots of magnetic field and microwaves, and electric mattress does strong magnetic field. In video game room strong magnetic and considerable electric fields were measured. It was observed strong magnetic field inside of electric powered train and very strong magnetic and electric fields on some platforms. Hand-phone and car-phone radiate very hazardous level of microwaves to brain and that they rapidly come into wide use. In this study data base for various electric machines and places radiating strong EMFs were constructed and could be used for future epidemiological studies.

• Journal of Korean Public Health Nursing
• /
• v.20 no.1
• /
• pp.28-38
• /
• 2006

Purpose: To explore the level of health status and health promotion lifestyle, and the group differences in health promotion lifestyle among Seoul citizens who participated in free hypertension screening. Methods: This study was a cross sectional descriptive design. The administered questionnaire included the Health-Promoting Lifestyle Profile II (HPLP II), perceived health status scale, and demographic questions. Blood pressure was measured by researcher teams. Data were collected from July 2 to 6, 2004 in the waiting area of subway stations 7 in Seoul. The study subjects were 168 adults. Results: The average age of the respondents was 55.45 years and 38.7% of them perceived themselves as healthy, while 44% did not know their own blood pressure. Among the participants, 44.6% were classified as 'prehypertensive', and 36.9% as having high blood pressure. The mean score of health promotion lifestyle was 2.62 and the order of subcategories of health promotion lifestyle was interpersonal relationship, spiritual growth, nutrition, stress management, physical activities, and health responsibilities. The subcategories of health promotion lifestyle differed significantly by age, sex, job, and smoking. Conclusions: It is important to encourage adults to participate actively in health promotion. In addition, health promotion programs should be developed and implemented based on group differences.

• Culinary science and hospitality research
• /
• v.12 no.4 s.31
• /
• pp.1-17
• /
• 2006

The purpose of this study was to find out the impact of a selection attribute on customer satisfaction and customer loyalty in the coffee house industry. Through the preceding research, author chose coffee quality, price value, interior and employee service quality as selection attributes as well as customer loyalty as intent to recommend and to revisit. For this study, data were collected from the pedestrians around Kangnam, Samsung, Seoul national university of education subway stations from July 12 to August 4, 2005. Questionnaires were distributed and, of 314 papers, only 300 were suitable for the statistical analysis. The findings of the research were as follows: First, four selections had an effect on customer satisfaction which influenced customer loyalty. Coffee quality was the most influential variable among the selection attributes, and came price value, and interior and employee service quality in that order. Second, intent to revisit was influenced directly by not only customer satisfaction but also intent to recommend. However, this study had such limitations that data used in this study were limited to relatively narrow area and four attributes were not enough to explain all situations of choosing coffee houses. Consequently, further studies are needed to include more variables and coffee houses' brand images.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.25 no.1
• /
• pp.1-8
• /
• 2007

People tend to spend more time in indoor spaces than before such as shopping malls and subway stations. As buildings become larger and more complex, people feel difficulty in finding their ways to destinations. Consequently, a means to provide better paths can aid people in reducing time for finding ways. Routing information in large indoor spaces is especially required in emergency cases as fire, power failure and terror. This study suggests to compute optimal paths using $A^*$ algorithm based on raster GIS data structure. The suggested method can be used either in daily lives for path provision or in emergency cases for evacuation, and is illustrated on a campus building.

• Journal of the Korea Convergence Society
• /
• v.10 no.4
• /
• pp.147-151
• /
• 2019

Modern people spend most of their daily lives in their homes, schools, or workplaces, hospitals, shopping malls, subway stations, rooms, and parking lots. According to the survey, air quality management at the multi-use facility is less than 50% satisfied. In this study, a photocatalytic filtration system is developed by utilizing a broadband-to-active photocatalyst that utilizes a media photocatalyst filter that removes airborne germs from indoor air as well as indoor air quality and operates on visible light as well as ultraviolet light.

• Journal of the Architectural Institute of Korea Planning & Design
• /
• v.33 no.12
• /
• pp.73-83
• /
• 2017

Due to the changes in the contemporary society, small-scale traditional markets have declined and lost their functions as the center of neighborhood commercial and cultural affairs. While most traditional markets are deteriorating, there exist rare cases of neighborhood small-scale traditional markets that continuously maintain their vitality and popularity. This paper examines urban spatial characteristics of those markets. As for the cases, this paper inventoried eighteen such markets in Gwanak-gu, Seoul. The research methods include literature reviews, on-site investigation of total 18 such markets, and participant observations. The findings of this paper are as follows: There are distinctive differences in the urban-spatial characteristics of physical environmental factors between the revitalized markets and declining markets. In terms of neighborhood and commercial environment, the franchised super-markets are not necessarily in competition with small-scale traditional markets. The former often has symbiotic relationship the latter, if the small scale traditional markets are strategically located in between residential areas and subway stations, providing active pedestrian networks. There are many outdoor display stands in the revitalized markets, while the declining markets rarely have them. The market improvement projects such as transforming the open space into arcade space, hardly have effects on revitalization of the small-scale traditional markets.

• Journal of Korea Multimedia Society
• /
• v.24 no.2
• /
• pp.312-319
• /
• 2021

This study aims to help users to have a more satisfying encounter based on the problems found by comparing and analyzing similar applications. That is, an application that derives intermediate points through the subway, which is a public transportation means, and provides information on nearby convenience facilities was proposed. The middle point calculation process uses the dijkstra algorithm, which stores the minimum number of nodes in the stored path from the first input location to the last location. The stack and arraylist are used to search all paths from the first input position to the last position, and then the path with the smallest number of nodes is selected. After that, the number of stations in the route is divided in half and the resulting station is output. In addition, this study provides information on convenience facilities near intermediate points in order to have differences from similar applications. It categorizes within a 1km radius of the point and provides a function that helps to conveniently identify only facilities around the middle point. In particular, by visualizing the number of convenience facilities with radar charts and numbers, it is possible to grasp the commercial district around the midpoint at a glance.

• Journal of Wellbeing Management and Applied Psychology
• /
• v.6 no.2
• /
• pp.1-7
• /
• 2023

Purpose: The purpose of this study is to investigate the characteristics of airborne radon concentration by season in public-use facilities in South Korea. Research design, data and methodology: The data is provided by the public data portal, and public-use facilities nationwide where radon in the air is measured are specialized sanatorium for senior citizens, libraries, childcare facilities, postpartum care centers, medical institutions, funeral halls, underground shopping malls, and underground subway stations. Results: The facility with the highest radon concentration in public-use facilities was childcare facilities with an average of 50.2 ± 21.7 Bq/m³, while the average of medical institutions was the lowest at 24.8 ± 5.7 Bq/m³. The season with the largest difference in average radon concentration between childcare facilities and medical institutions was in the order of fall (28.6 Bq/m³), followed by winter (28.1 Bq/m³), spring (23.0 Bq/m³), and summer (22.0 Bq/m³). Conclusions: The main concentration levels of each public-use facility shown in this study are all below domestic and international standards, but there is a significant concentration difference between facilities. By season, winter showed the highest average concentration (40.6 ± 21.3 Bq/m³) and summer showed the lowest average concentration (23.8 ± 14.0 Bq/m³).