• Korean Journal of Construction Engineering and Management
• /
• v.13 no.4
• /
• pp.48-59
• /
• 2012

Gangform, compared to the traditional forms, is a systemized form which can reduce construction duration and cost by the advantage of using it repeatedly. However, transportation and climbing process of the Gangform is highly dependant on the performance of tower crane. Gangform climbing process takes one day out of six to seven days of a structural work cycle. Tower cranes can not be used in other lifting works when they lift the Gangform during the structural work cycle, causing the delay in the construction project. Numerous efforts and researches have been done in domestic and international industry to solve such limitations of Gangform climbing process. Especially, "A Study on the Development of Automatic Gangform Climbing System for Apartment Housing Construction"has suggested a conceptual model which can climb the Gangform system without a tower crane. In this paper, the technical and economical feasibilities of previously proposed Automatic Gangform climbing system are examined by evaluating its structural stability and lifting load reduction effect.

• Journal of Korea Water Resources Association
• /
• v.40 no.5
• /
• pp.383-396
• /
• 2007

The studies on efficiency of flood control reservoir has been introduced into four categories including direct flood control contribution by reservoir, flow-duration change and environmental-ecological change in downstream of dam and flood damage estimation of flood plain. In spite of all the previous approaches, the quantification of the effect of reservoir on the flood control in planning stage is quite complex due to lack of a standard for quantifying feasibility of project. In this study, we develop a methodology that can clearly and accurately quantify the flood damage reduction together with the existing flood level reduction at downstream. The proposed approach uses three appraisal standards of flood control: 'potential safety', 'relative risk' and 'absolute risk' according to the risk by stage. The developed methodology was applied to the Namhan river basin with the storm event of July, 2006. The result shows the damage reduction of 4,189 billion won was estimated. The economic benefits for the flood control effect by dam will greatly contribute to the public understanding of the importance and the effect of the flood control by dam.

• Journal of Korea Water Resources Association
• /
• v.42 no.4
• /
• pp.343-353
• /
• 2009

The objective of this study is to evaluate the effect of the water quality improvement by water discharge through dams and to provide a benefit estimation methodology, taking domestic situation into consideration, by the replacement cost approach analyzed with a sewage treatment plant instead of an alternative dam. To this end, facility that alternates a dam must have same functions of the discharged water from the dam and the two facilities must be able to be compared objectively. To estimate the benefit, estimation methodology of alternative facility's cost is established and criteria of cost.benefit analysis that are duration period and ratio of large scale repairing expense was presented. As a case study, the water quality improvement benefit of Song-Li-Won dam was evaluated, which is planned to be built on Nae-Sung stream in Nak-Dong River system. The results of applying this methodology to Song-Li-Won dam are 644,006 million won of the annual average discharge and 1,351,526 million won of maximum discharge. The usage of the framework in this study is expected for estimation of water quality improvement benefit in case water quality improvement project is performed.

• Journal of the Korea Convergence Society
• /
• v.11 no.10
• /
• pp.369-376
• /
• 2020

This study was to investigate the predictors of suicidal thoughts in the subjects who received the support for depression drug costs at a local public health center. The subjects were 156 depressed patients aged 18 and over. Data analysis was conducted by descriptive statistics, χ²-test, t-test and logistic regression analysis. The results of the analysis showed that the suicidal thoughts rate of the subjects was 25%, and the subjects showed significant differences in suicidal thoughts as the duration of antidepressant use was longer (t=-2.19, p<.05), the perceived physical health(t=3.03, p<.01) and the perceived mental health (t=5.21, p<.001) were lower, and the depression(x²=41.11, p<.001) were higher. The predictors of suicidal thoughts were perceived mental health(OR=0.97, p<.05) and depression(OR=8.44, p<.001). The regression equation of this study explained 42.4% of the suicidal thoughts of the subjects. Continued assessment and convergent mental health promotion programs are required for depression patients living in the community.

• Journal of agricultural medicine and community health
• /
• v.30 no.3
• /
• pp.293-303
• /
• 2005

Objectives: Yearly, annual report of cancer patients in Korea is released by National Cancer Center. But, this report is focused in all of the patients in nation. So, there is needed to modify and analyze this report to be used properly for local resident. In Ulleung island, local county and Ulleung medical center don't have cancer occurrence data of local resident until now. The aim of this analysis is to know characteristics and data of cancer patients occurrence in Ulleung island for 10 years. Methods: We are offered data of cancer patients occurrence in Ulleung island for 10 years from National Cancer Center. This data was composed of sex, address (only town level), diagnosed date, diagnosis. So, we analyze this data and compare to Korea data for same duration. Results: There were 268 patients for 10 years (1993-2002). Man were 175 about 65% and women were 93 about 35%. There were 163 in Ulleungeup about 60%, 39 in Seomyun about 14.5% and 48 in Bukmyun about 18%. There were 19 patients in unknown residence. After 1998, above 30 patients were occurred, but before 1998, below 27 patients were occurred. Diagnosed date was concentrated in June, 33 patients were occurred about 12%, but least occurred month was December. Most occurred age were from 60 to 69, there were 80 patients about 30%. Most occurred cancer was gastric cancer, there were 54 patients about 20%. Hepatic cancer was second and third was lung cancer. In man, most occurred cancers were gastric cancer and hepatic cancer, both was 38 patients. In woman, gastric cancer and uterine cervix cancer were occurred mostly. After 2001, in Korea most occurred female cancer was breast, but in Ulleung island, most occurred cancer was stomach. Conclusions: Researcher should demand and analyze cancer data from National Cancer Center that cancer management project in local county and public health education of cancer could focus on local resident because annually released cancer data from National Cancer Center focus on a nation. In Ulleung island, cancer incidence was more than incidence in Korea and breast cancer was occurred less than in Korea. So, more study should be needed to confirm why more cancer were occurred than Korea and breast cancer was less occurred.

• Journal of Technology Innovation
• /
• v.20 no.2
• /
• pp.29-48
• /
• 2012

As the complexity and uncertainty of social and economic systems increase, the strategic foresight that actively and effectively responds to the environmental changes becomes important. A wide range of future forecasting methods are available for strategic foresight. Selecting one of the methods depends on several factors such as availability of time and financial resources and the objectives of the exercise. Although trend extrapolation analysis has been used for many years, scenario planning is being widely used by government and corporate as a tool for strategic decision making in recent years. Generally, scenario planning is carried out through workshop, in which experts with diverse backgrounds exchange information, views, and insights and integrate the diverse viewpoints. However, only a small number of experts can participate in a workshop and citizen opinion is not easily transformed into the policy for the scenario exercise due to the limitation of budget and short duration of a project. It is also much harder to develop creative ideas in the workshop because of the limited time and space. In this study, a new scenario process combining scenario workshop and wiki is proposed to overcome the limitation of scenario workshop. This combined approach can be more productive than using scenario workshop alone when developing new ideas. In this study, we applied the combined approach to develop scenarios for the strategic foresight of future media and present suggestions for improving the process.

• Land and Housing Review
• /
• v.3 no.4
• /
• pp.315-322
• /
• 2012

Recently multifaceted advantages of urban agriculture are emerging in civil society and related policy arena such as food safety, environment, and social welfare. This study tried an estimation of residents' willingness-to-pay for urban farming to examine feasibility of using part of urban green infrastructure as urban farm (e.g. allotment garden). A survey targeting Bundang and Dontan new-town residents was carried out and willingness-to-pay for urban farm rental was estimated by contingent valuation method (CVM). The estimated rent was cross-checked with the rental cost and travel cost paid by hobby farm users in the outskirt of metropolitan area. The result of this study showed that the potential demand for urban farming is ample if urban farms or allotment gardens are planned within new development areas. That is, 72.6 percent of new-town residents questioned had intention of using allotment garden within urban parks and green spaces. Estimated willingness-to-pay for renting a plot, $16.5m^2$ of urban farm, was about 236,000 won(KRW), which is higher than rent for a plot of allotment garden which is located out of city. Variables which were statistically significant to estimated willingness-to-pay for urban farming were sex, age, and occupation of respondents, among other explanatory socio-demographic variables, while expected frequency and duration of visit to urban farm were insignificant.

• The Journal of Korean Obstetrics and Gynecology
• /
• v.31 no.4
• /
• pp.147-164
• /
• 2018

Objectives: This study was performed to analyze the pattern identification in infertile women who participated in infertility support program of Cheongju-city. Methods: The project proceeded from October, 2016 to June 2017. Participants filled in the questionnaire which is composed of 33 symptoms before korean medical treatments. Data were collected from 17 participants. We classified symptoms into six pattern identifications based on previous research and rated each answer to score. Results: Throughout the study, the average age of 26 patients was $34.88{\pm}3.19$ years old, the average height was $162.51{\pm}4.99cm$, and average weight was $58.41{\pm}7.88kg$. The average duration of acupuncture treatment was $121.03{\pm}52.73$ days and the average times of acupuncture treatment was $27.42{\pm}10.77$ times. The average number of herbal medicine treatment was $2.65{\pm}0.69$, the majority of it was Chokyungjongok-tang. After the treatment, 3 patients of infertility became pregnant (11.54%) in twenty six patients. By analyzing pattern identification survey papers, We can classify infertile women into 6 pattern identification based on previous research. The majority of participants was identified as Blood deficiency and the other participants were identified as Kidney deficiency, Liver depression, Dampness-phlegm, Qi deficiency and Static blood in order of priority. Most of patients' pattern identification were combined with two kind of pattern identification. In terms of priority, Liver depression combined with Kidney deficiency, Blood deficiency combined with Kidney deficiency, Liver depression combined with Qi deficiency, Liver depression combined with Dampness-phlegm. Conclusions: After the study we confirmed that Korean traditional medicine is a safe treatment for infertile women. Further clinical study about herbal medicines of patients who have combined pattern identification is needed.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.5C
• /
• pp.527-539
• /
• 2009

In this paper, we propose an asynchonous ICI (Inter-Cell Interference) mitigation techniques for 3GPP LTE MIMO-OFDMA down-link receiver. An increasing in symbol timing misalignments may occur relative to sychronous network as the result of BS (Base Station) timing differences. Such symbol synchronization errors that exceed the guard interval or the cyclic prefix duration may result in MAI (Multiple Access Interference) for other carriers. In particular, at the cell boundary, this MAI becomes a critical factor, leading to degraded channel throughput and severe asynchronous ICI. Hence, many researchers have investigated the interference mitigation method in the presence of asynchronous ICI and it appears that the knowledge of the SCM (Spatial Covariance Matrix) of the asynchronous ICI plus background noise is an important issue. Generally, it is assumed that the SCM estimated by using training symbols. However, it is difficult to measure the interference statistics for a long time and training symbol is also not appropriate for MIMO-OFDMA system such as LTE. Therefore, a noise reduction method is required to improve the estimation accuracy. Although the conventional time-domain low-pass type weighting method can be effective for noise reduction, it causes significant estimation error due to the spectral leakage in practical OFDM system. Therefore, we propose a time-domain sinc type weighing method which can not only reduce the noise effectively minimizing estimation error caused by the spectral leakage but also implement frequency-domain moving average filter easily. By using computer simulation, we show that the proposed method can provide up to 3dB SIR gain compared with the conventional method.

• Journal of the Korea Institute of Building Construction
• /
• v.10 no.6
• /
• pp.127-135
• /
• 2010

As logistics facilities have a high ceiling height, simple structure, and the need for a quick return on investment, it is usually essential to advance the construction schedule of such facilities. Accordingly, PC structures, which require less labor, cost and schedule, can be more competitive than RC structures. However, most construction companies in Korea are familiar with RC structure design, have negative perceptions regarding PC structures, and do not sufficiently adopt new construction techniques. The structure that this research features has 110 columns that are 14 m high and are built to the same specification, and applying an RC design to the structure will lead to issues related to constructibility, economic viability, project duration and safety. Therefore, this study intends to feature PC design as an alternative to the RC warehouse design, and perform a comparative analysis of the reduction in labor, cost and construction schedule to highlight benefits. The research outcomes herein will provide inputs to subsequent studies on new construction strategies to advance the construction schedule, improve quality and constructibility, enhance safety and save costs.