• Journal of Korean Tunnelling and Underground Space Association
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• v.20 no.5
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• pp.823-837
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• 2018

Congestion of the city with the rapid industrial development was accelerated to build complex social infrastructure. And numerous structures have been designed and constructed in accordance with these requirements. Recently, to solve complex urban traffic, many researches of large-diameter tunnel under construction downtown are in progress. The large-diameter tunnel has been developed with a versatile double-deck of deep depth tunnel. For the safe tunnel construction, ground reinforcement methods have been developed in the weakened pillar section like as junction of tunnel. This paper focuses on evaluation of the effects of new developed ground reinforcement methods in double-deck junction. The values of reinforcement determined from the existing and developed methods were compared to each other by numerical simulation.

• The Korean Journal of Financial Management
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• v.12 no.1
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• pp.93-108
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• 1995

본 연구에서는 첫째로 전환사채의 발행이 주주들의 부에 미치는 어떤 영향을 미치며, 둘째로 어떤 원천으로부터 이와 같은 영향이 나타나는가를 실증분석하였다. 실증분석을 통하여 다음과 같은 사실을 발견하였다. 첫째로 기존의 국내 연구결과와 달리 전환 사채의 발행이 주주들의 부에 부(-)의 영향을 미치는 것으로 나타났다. 둘째로 전환사채의 발행이 최초로 증권시장지에 공시되는 (0일, +1일)의 공시기간에서 관찰되는 부(-)의 비정상수익률이 기존의 이론적 틀에서 암시하는 가설로서 설명될 수 없었으며, 전환가격이 과소책정됨에 따라서 주주들의 부가 전환사채소유자들의 부로 이전되는 부의 이전효과가 부(-)의 비정상수익률을 가장 잘 설명하고 있는 것으로 나타났다. 이와 같은 결과는 우리나라의 경우 부의 이전현상에 기인하여 전환사채의 발행이 주주들의 부에 부(-)의 영향을 미친다는 실증적 증거로 보인다.

• Journal of Korean Society of Steel Construction
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• v.14 no.1
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• pp.79-85
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• 2002

Recently, prestressed H-Beam bridges with external unbonded Tendons are increasingly built. The mechanical behavior of prestressed steel H-beams is different from that of normal bonded PSC beams in a point of the slip of tendons at deviators and the change of tendon eccentricity that occurs, when service load are applied in external unbonded steel H-beams. The concept of prestressing steel structures has been widely considered, in spite of long and successful history of prestressing concrete members. In the study, The flexural test on prestressed steel H-beams has been performed in the various aspects of prestressed H-beam including the tendon type and profile. The load was plotted against the deflection and the strain respectively in the steel beam and prestressing bars. The value expected with the equation of internal force equilibrium and compatibility between the deflection of the bars and the H-beam was found to correlate well with the measured data.

• The Journal of the Korea Contents Association
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• v.21 no.2
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• pp.280-289
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• 2021

The purpose of this study is to examine the effect of self-esteem on relationships between experience of discrimination and school life maladjustment. This study utilized 648 elementary school students who participated in Community Child Center Children's Panel Survey. Collected data was analyzed through correlation analysis and regression analysis using SPSS Win 21.0 statistical program. First, the experience of being discriminated and discriminating against others were positively related school life maladjustment but were negatively related self-esteem. Second, self-esteem had partially mediated school life maladjustment during discriminating against others. And self-esteem had totally mediated school life maladjustment during being discriminated. Based on these results, this study discusses practical implications for preventing discrimination of children attending community child center.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.2
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• pp.555-566
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• 2018

The aim of the study was to explore the mediating effect of meaning in life on the relationship between meaning making about process of achieving long term goals and happiness. 180 college students completed the open questionnaire about personal long life goal, also rated the scales of meaning making, meaning in life and subjective well-being. The correlation analysis, hierarchical regression analysis, and sobel test were examined. The results as followed. First, meaning making, meaning in life and happiness were positive correlated. Second, the relationship between meaning making about process achieving long term goals and happiness was completely mediated by meaning in life. The finding suggested that meaning making and meaning in life can help to enhance happiness in college students. Also the results supported that meaning in life was important factor that affects subjective well-being in Koran college students. Finally, the limitations were suggested for future research.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.3D
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• pp.287-293
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• 2008

Density is used as the measure of effectiveness within the ramp junction influence area suggested in the KHCM 2005 in the LOS analysis of the ramp junction, and also density predictive models suggested in the KHCM 2005 is constructed based on the expressway with the speed limit of 100km/h or 110km/h in Korea. So, the density predictive models suggested in the KHCM 2005 are needed to verify if the models could be applied to the urban freeway with the speed limit of 80km/h or less, because the speed limits on most of the urban freeways in Korea are 80km/h or less. The purpose in this study is to construct and verify the appropriate density predictive model within the on-ramp merge influence area of the urban freeway by comparing with the USHCM 2000 and KHCM 2005 models.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.7B
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• pp.1226-1235
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• 2000

신호망에서의 지연은 망관리 행위의 응답시간에 직접적인 영향을 미치기 때문에 모든 제어정보는 가장 효과적으로 전송되어야 한다. 신호망이 효율적으로 운용되는지 뿐만 아니라 신호망의효과적인 설계를 위해서 신호시스템의 성능을 아는 것이 매우 중요하다. 본 논문에서는 공통선 신호 시스템의 신호망 기능부의 지연 성능을 분석하였다. 분석은 ITU-T 규격을 기반으로 다른 계층의 프로토콜에 독립적인 큐잉모델을 만들어 대기체계분석을 통하여 이루어졌다. 또한 신호망 기능부가 신호 메시지 처리부와 신호망 관리부로 나누어져 구성되는 것도 고려하여 모델링하였다.

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.113-113
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2019.09a
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• pp.71-71
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• 2019

• Journal of the Korean Society of Hazard Mitigation
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• v.4 no.3 s.14
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• pp.61-72
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• 2004

In this research, multi reservoir operation methods for reservoirs in Han River are proposed based on the single dam operation models using fuzzy control techniques. The result of fuzzy controled single dam operation has shown that it can improve flood controllability at the downstream of dams. Among the many control rules of fuzzy operation, a rule that shows the most effective flood control rate at the downstream has been selected as Ike operation rule. The simulated results for 1990 and 1995 flood events are compared with historical ones. As the results, it is founded that suggested models can reduce the inundation of upstream and keep the water elevation lower at downstream, which make the proposed models as the effective methods in multi reservoir operation.