• International Journal of High-Rise Buildings
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• v.1 no.1
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• pp.37-51
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• 2012

New generation of tall and complex buildings systems are now introduced that are reflective of the latest development in materials, design, sustainability, construction, and IT technologies. While the complexity in design is being overcome by the availability and advances in structural analysis tools and readily advanced software, the design of these buildings are still reliant on minimum code requirements that yet to be validated in full scale. The involvement of the author in the design and construction planning of Burj Khalifa since its inception until its completion prompted the author to conceptually develop an extensive survey and real-time structural health monitoring program to validate all the fundamental assumptions mad for the design and construction planning of the tower. The Burj Khalifa Project is the tallest structure ever built by man; the tower is 828 meters tall and comprises of 162 floors above grade and 3 basement levels. Early integration of aerodynamic shaping and wind engineering played a major role in the architectural massing and design of this multi-use tower, where mitigating and taming the dynamic wind effects was one of the most important design criteria established at the onset of the project design. Understanding the structural and foundation system behaviors of the tower are the key fundamental drivers for the development and execution of a state-of-the-art survey and structural health monitoring (SHM) programs. Therefore, the focus of this paper is to discuss the execution of the survey and real-time structural health monitoring programs to confirm the structural behavioral response of the tower during construction stage and during its service life; the monitoring programs included 1) monitoring the tower's foundation system, 2) monitoring the foundation settlement, 3) measuring the strains of the tower vertical elements, 4) measuring the wall and column vertical shortening due to elastic, shrinkage and creep effects, 5) measuring the lateral displacement of the tower under its own gravity loads (including asymmetrical effects) resulting from immediate elastic and long term creep effects, 6) measuring the building lateral movements and dynamic characteristic in real time during construction, 7) measuring the building displacements, accelerations, dynamic characteristics, and structural behavior in real time under building permanent conditions, 8) and monitoring the Pinnacle dynamic behavior and fatigue characteristics. This extensive SHM program has resulted in extensive insight into the structural response of the tower, allowed control the construction process, allowed for the evaluation of the structural response in effective and immediate manner and it allowed for immediate correlation between the measured and the predicted behavior. The survey and SHM programs developed for Burj Khalifa will with no doubt pioneer the use of new survey techniques and the execution of new SHM program concepts as part of the fundamental design of building structures. Moreover, this survey and SHM programs will be benchmarked as a model for the development of future generation of SHM programs for all critical and essential facilities, however, but with much improved devices and technologies, which are now being considered by the author for another tall and complex building development, that is presently under construction.

• Korean Journal of Agricultural Science
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• v.37 no.1
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• pp.151-160
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• 2010

Housing is one of the most important factors determining the quality of rural life. Housing condition in rural area has been deteriorating over the past years in spite of many rural development programs. Korean government formulated 'Rural Housing Environment Improving Plan' including rural rent-house program in 2006. This study aims to find the fundamental intension of rural people for adopting the rent-house system in rural area. To do this, background and current state of rural rent-house program are presented and the demand for rural rent-house is analyzed based on the survey results done by Korea Rural Community Corporation in 2005. Major findings from the survey analysis imply that the size/age/ownership of the current houses and the age of householders, motive and time period of current residing, and components of households are significant factors when considering whether they are willing to apply rural rent-house.

• Electronics and Telecommunications Trends
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• v.36 no.4
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• pp.61-71
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• 2021

Navigation satellite systems (GPS, GLONASS etc.) provide three main services, i.e., positioning for location based services, navigation for multi-modal transportation services, and timing for communication and critical infrastructure services. They were started as military systems but were extended to civil service. Navigation satellite navigation system began with GPS in the USA and GLONASS in Russia at nearly the same time. Indian NavIC and Chines BDS announced their FOCs in 2016 and 2020, respectively and European Galileo and Japanese QZSS are catching up others. In these days, Navigation Satellite System, Positioning, Navigation, and Timing services are part of our daily life very closely. They are required for autonomous driving car, Unmanned vehicles like UAV, UGV, and UMV, 5G/6G telecommunications, world financial system, power system, survey, agriculture, and so on. The services among navigation satellite systems are very competitive and also cooperative one another. This article describes the status of these systems and evolution in the technical and service senses, which may be helpful for planning korea positioning system(KPS).

• Journal of Forest and Environmental Science
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• v.34 no.3
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• pp.262-274
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• 2018

Spider fauna of Demilitarized Zone (DMZ) and adjacent areas in Korea was surveyed in 2001-2003, 2013-2015, and 2017. Total of 34 surveyed areas across 10 provinces were divided into four main regions (east coast, mid-east mountain, midland, and west coast areas) in accordance with administrative districts and topography. Total of 273 species of 145 genera in 32 families were identified from 10,886 collected spiders. In conclusion, the spider fauna in the DMZ is 281 species of 147 genera in 32 families with 162 species of 99 genera in 23 families in the previous reports. This corresponds to about 37.6% of the Korean spiders as of 2015. The species richness among surveyed localities was ranged 45 species to 92 species. The species richness of each taxon is high in Araneidae, Salticidae, Linyphiidae and Theridiidae. Habitat generalists were 22 species and habitat specialists were 69 species. The 143 species were web builders and 130 species were wanderers by the outlined life style. In DMZ spiders, only 7 species, Thymoites ulleungensis, Arcuphantes pennatus, Lycosa coreana, Allagelena koreana, Cybaeus mosanensis and Cybaeus triangulus, Kishidaia coreana, were recognized as Korean endemic. Five species, Scytodes thoracica, T. ulleungensis, Lycosa labialis, Takeoa nishimurai, and Phrynarachne katoi, are rare species with a trend of decreasing density in recent years. Araneus rotundicornis has been discovered for the first time since its first report. This study may be useful in the conservative management and will contribute to knowledge of the distribution and biogeography of DMZ areas in the future.

• Quality Improvement in Health Care
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• v.9 no.1
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• pp.6-17
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• 2002

Background : This study was conducted to investigate the current situation of medical supply purchasing and stock management at general hospitals having more than 150 beds in Korea and to find methods of effective purchasing and optimal stock management. Methods : Survey was done from staff at the purchasing departments of 229 general hospitals throughout Korea. Data collection was done using a structured questionnaire between January 3 to March 15, 2001. The survey form was returned from 88 hospitals (rate of return: 38.4%). Results : Firstly, 13.6% of the hospitals did not carry the optimal stock of medical supplies, the lead time optimal stock was 3 weeks or longer in 64.4% of the hospitals. Secondly, since 69.8% of the hospitals showed passive attitude toward training on purchasing management and stock management techniques. Thirdly, as for the question on the presence or absence of a deliberation committee for purchasing of new medical supplies, 60% of the hospitals with less than 300 beds did not have one, and 9.4% of the hospitals opened the deliberation committee less than twice a year. Conclusion : At the time of purchasing new medical supplies, purchasing should be done according to the decision by the deliberation committee so that no deduction is made at the time of claiming insurance, and by setting a certain period of time, purchasing of those medical supplies that were not purchased during this period needs to be done according to the decision by the deliberation committee.

• The Journal of the Korea Contents Association
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• v.19 no.1
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• pp.339-349
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• 2019

The purpose of this study is to analyze the influential factors on the change in life satisfaction of elderly households. In this study, single and couple elderly households were defined as elderly households and the 2nd, 3rd, and 4th data of the Korean Longitudinal Survey of Ageing (KLoSA) provided by the Korea Employment Information Service (KEIS) were used. And 677 respondents aged 65 and over who had replied to all 3 sessions were included in the final subjects. multinomial logistic regression analysis was conducted to examine the influential factors on life satisfaction by the type of elderly households according to consumption pattern and the result showed that there were common influential factors such as house owning status and subjective health status and the factors that influence specific types such as expectancy of standard of living. In addition, in the longitudinal analysis of life satisfaction of elderly households, individual satisfaction level was confirmed to reduce with time and the factors that influence the longitudinal change in the level of life satisfaction of elderly households was analyzed through the conditional model of a latent growth model. The analysis results showed that household type, house owning status, and subjective health status influenced the initial value of life satisfaction of elderly households while household type and expectancy of living standard influenced the change rate of life satisfaction of elderly households. Based on the results of this study, the followings are suggested. There is a need to improve the life satisfaction of old age by increasing the opportunity for self-realization of elderly households and also policy approach should be made selectively taking various types into consideration.

• Journal of Families and Better Life
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• v.28 no.2
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• pp.123-130
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• 2010

This longitudinal study investigated the mediating effects of self-control and self-esteem on the associations between parenting behaviors and middle school students' externalizing problems in single parent families. Participants were 174(2003-2004 panel 1 data of Korea Youth Panel Survey). The results of structural equation modeling indicated that self-control and self esteem did not mediate the associations between time 1 parenting behaviors and time 2 middle school students' externalizing problems, after accounting for the effects of time 1 middle school students' externalizing problems.

• Journal of Families and Better Life
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• v.31 no.4
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• pp.97-111
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• 2013

The purpose of this study was to explore the typology of child care, investigate the characteristics of child care types, and analyze the differences in time deficit as well as time satisfaction by the types of child care for dual-earner couples with preschool children. The data source for this research was the 2009 Time Use Survey conducted by the Korea National Statistical Office. Dual-earners aged 20 to 59 years completed 1,568 time diaries, which were analyzed using chi-square, cluster analysis, and ANOVA analysis. Child care time was classified into three types in the three categories of child care, household work sharing and leisure sharing for both males and females respectively. Three types for husbands were named "vulnerable", "household work child care predominant" and "leisure predominant". The three types for wives were named "vulnerable", "household work child care oriented" and "household work child care". The characteristics of each type depended on age, education, weekly working hours, gender role of husbands and age, weekly working hours of wives. The vulnerable type of wives showed the highest level of time deficit. Based on the results, implications for Public policy on child care and various types of education as well as programs were suggested.

• The Journal of the Korea Contents Association
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• v.16 no.9
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• pp.628-637
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• 2016

The purpose of this study was to explore factors influencing quality of life among cancer survivors in order to identify strategies for cancer survivors to go back to normal life and carry on stable and high quality life. This study used Korea National Health and Nutrition Examination Survey(2010-2014), conducted by Korea Centers for Disease Control and Prevention(KCDC). The sample of this study was 610 cancer survivors and their average time since diagnosis was about 11 years. The most powerful influencing factors for quality of life among cancer survivors were activity limitation(${\beta}$=.30, p<.001), followed by age(${\beta}$=-.20, p<.001), subjective health status(${\beta}$ =-.19, p<.001), and economic status(${\beta}$=.12, p=.004). According to the result, limitation on daily activities or social activities due to physical or mental debilitation was a strong factor that lowers quality of life among cancer survivors. Hence, there is a need for manpower and infrastructure that facilitates, supports, and manage daily activities of cancer survivors.

• Korean Journal of Ichthyology
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• v.24 no.1
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• pp.56-61
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• 2012

The distribution status and population size of the endangered species, $Cobitis$ $choii$, were investigated in the Guem River, Korea. From 1984~2004, this species occurred at 20 survey stations; however, their numbers have but rapidly decreased in recent years (2006~2011), during which time they were only observed at six stations. The area of their habitat is narrow and occurs in primarily downstream, sandy zones. Using the mark-recapture method, populations were estimated at 9,106 and 34,717 individuals for the main habitats of Baekgok and Ji Stream, respectively.