• International Journal of Highway Engineering
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• v.19 no.6
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• pp.13-21
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• 2017

PURPOSES : In this research, an SB3-level roadside barrier for a highway transition zone that meets the newly established guide Installation and Management Guide for Roadside Safety Appurtenance is developed. Its performance is evaluated by a numerical simulation and real-scale vehicle impact test. METHODS : The commercial explicit dynamic software LS-DYNA is utilized for impact simulation. An FE model of a passenger vehicle developed and released by the National Crash Analysis Center (NCAC) at George Washington University and a heavy goods vehicle (HGV) model developed by the TC226/CM-E Work Group are utilized for impact simulation. The original vehicle models were modified to reflect the conditions of test vehicles. The impact positions of the passenger vehicle and truck to the transition guardrail were set as 1/2 and 3/4 of the transition region, respectively, according to the guide. RESULTS : Based on the numerical simulation results of the existing transition barrier, a new structural system with improved performance was suggested. According to the result of a numerical simulation of the suggested structural system, two sets of transition barriers were manufactured and installed for real-scale vehicle impact tests. The tests were performed at a test field for roadside safety hardware of the Korea Highway Corporation Research Institute. CONCLUSIONS : The results of both the real-vehicle impact tests and numerical simulations of the developed transition barrier satisfied the performance criteria, and the results of numerical simulation showed good correlation with the test results.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1583-1593
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• 2011

As we see the continuation of the increase in the speed of the High Speed railroad worldwide, there is a concern for a possible problem in the connecting transition zone in the railway infrastructure. Honam High Speed railroad's transition zone in the hub for the rotation structures and other supporting structures such as approach slab, sub slab, approach block, etc. Due to its increase in speed of the design speed, and its important role on the driving stability and credibility of the bearing ground performance, we must seek and fine a prevention plan for a cause of differential settlement, as well as the cause of the derailment. In this dissertation, domestic, as well as international design manuals and the applicability of the control standards are studied. Also through the study target, Honam High Speed railroad zone 4-1, we evaluated the connecting componant of the Yeon-Jeong bridge through the eigenvalue and weight transfer of the train when operated at 300km/h, 350km/h, 400km/h, 450km/h, and were able to achieve detailed assessment by checking track behaviors, looking at various components such as the rotation acceleration according to the inversion of the distance length, displace length, displacement and stress distribution. Through these studied, possibility of operating at 400km/h was evaluated based on the condition of the current design basis.

• Journal of the Korean association of regional geographers
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• v.17 no.6
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• pp.710-725
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• 2011

The purpose of this study is to analyze both residential conditions and the resident impressions of the transition zone of central Daegu. The results drawn from a questionnaire survey of the residents are summarized as follows: 1) The proportion of people over the age of 60 living on a low income is high and consists mostly of retired citizens who have lived in the transition zone, in their own homes, for an extended length of time 2) The condition of infrastructure in the transition zone is very poor, however, despite the housing deterioration, the internal repair and maintenance of houses is more satisfactory than their external appearance. 3) Residential satisfaction received high ratings in every category except pollution and housing price. This response appears to stem from the easy commute of residents as well as the ready availability of facilities in the city center. 4) In terms of residential satisfaction, the residents can be divided into two groups. The first, with a high satisfaction rate, consists mainly of senior citizens who possess both personal homes and a stable living, having resided in the city center for most of their lives. The second, with a lower satisfaction rate, is composed mostly of younger residents who have lived temporarily in inexpensive rental homes. As a results, the residential area in the transition zone of central Daegu does not appear to be a problematic area like the slum of the West, but instead a stable settlement for its residents.

• The Journal of the Korea Contents Association
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• v.15 no.3
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• pp.184-191
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• 2015

Prostate ultrasound is used to diagnose prostate cancer, BPH, prostatitis and biopsy of prostate cancer to determine the size of prostate. BPH is one of the common disease in elderly men. Prostate is divided into 4 blocks, peripheral zone, central zone, transition zone, anterior fibromuscular stroma. BPH is histologically transition zone urethra accompanying excessive nodular hyperplasia causes a lower urinary tract symptoms(LUTS) caused by urethral closure as causing the hyperplastic nodule characterized finding progressive ambient. Therefore, in this study normal transition zone image for hyperplasia prostate and normal transition zone image is analyzed quantitatively using a computer algorithm. We applied texture features of GLCM to set normal tissue 60 cases and BPH tissue 60cases setting analysis area $50{\times}50pixels$ which was analyzed by comparing the six parameters for each partial image. Consequently, Disease recognition detection efficiency of Autocorrelation, Cluster prominence, entropy, Sum average, parameter were high as 92~98%.This could be confirmed by quantitative image analysis to nodular hyperplasia change transition zone of the prostate. This is expected secondary means to diagnose BPH and the data base will be considered in various prostate examination.

• Computational Structural Engineering
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• v.8 no.2
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• pp.85-93
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• 1995

This study presents the formulation of beam transition elements and transition zone elements for the effective finite element analysis of the transition regions of coupled wall structures. Beam transition element can be described as the quasi beam element which is replaced by an equivalent plane stress element, keeping equally, the basic behavior of beam element, based on the kinematic and force constraints between beam and wall element. These beam transition elements solve the incompatibility related to different degrees of freedom between beam and wall element in transition regions. Also, the stiffness matrices of transition zone elements which are directly connected with beam transition elements in transition regions can be derived from the equivalent constraint conditions. These elements provide the reasonable mesh grading schemes for transition regions and can be usefully applied to the transition regions of all structures that the interactions of wall and beam element are considered.

• Magazine of the Korea Concrete Institute
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• v.10 no.2
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• pp.99-107
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• 1998

콘크리트는 일반적으로 수회시멘트풀과 골재로 이루어진 이상의 복합체이지만 미시적으로는 수화시멘트풀과 골재, 그리고 천이영역으로 이루어진 삼상의 복합체이다. 수화시멘트풀과 골재 사이에서 형성되는 천이영역은 국부적으로 공극률이 높으므로 콘크리트의 강성과 강도에 많은 영향을 끼친다. 본 논문에서는 이러한 천이영역의 특성을 고려하여 콘크리트의 탄성계수를 추정하기 위해 이원 삼중 내포물 모델을 제안하였다. 제안된 모델에 의한 탄성계수의 추정결과는 실험결과와 비교하여 잘 일치하였으며 제안된 모델은 실험적으로 구하기 힘든 천이영역의 특성을 구하는데 사용될 수 있다.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.1126-1131
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• 2007

In 1st Phase Kyeong-Bu High-Speed Line, to lessen the impact in the transition zone between concrete slab track(in tunnel) and ballasted track(on embankment), the ballast bonding method has been adopted. However, in this area, in the beginning of the operation, unsupported sleepers are found, and the track deterioration and damage of concrete sleepers have occurred. In this paper, the status and causes of unsupported sleepers are discussed and several repair measures are proposed.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.11a
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• pp.73-80
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• 2004

The speed up of conventional lines feel strongly the necessity of it, for fully realizing a role of transportation system, for human life style is high, and increasing of time value. Especially curved lines zone have crucial effects on the speed of train. In this study, the extension method of transition curve is evaluated, based on the alignment of Jang-Hang line, investigated field conditions of the sections where the curves exist. The result of this research is very applicable to the condition where it is difficult to over-all alignment improvements.

• Proceedings of the Korean Geotechical Society Conference
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• 2000.11b
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• pp.243-248
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• 2000

현재로서는 인발저항 메카니즘에 많은 불확실성들 즉, 구속된조건에서의 다일레이션, 인발저항영역, Transition zone의 존재, Debonding 메카니즘, Boundary condition등 이 내포되어있어, 아직까지 확립된 이론이 존재하지 않는다. 인발저항력 추정을 위해 그 동안 수많은 시도와 노력이 있었음에도 불구하고, 현장 인발시험이 현재 지반설계에 가장 적합한 방법으로 지금까지 통용되고 있는 실정이다. 쏘일네일설계시 요구되는 몇가지 중요한 문제들을 제기하고 그에 대한 나름대로의 해석과 결론을 제시하였다.

• Journal of the Korean Geophysical Society
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• v.8 no.4
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• pp.195-199
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• 2005

현재로서는 인발저항 메카니즘에 많은 불확실성들 즉, 구속된 조건에서의 다일레이션, 인발저항영역, Transition zone의 존재, Debonding 메카니즘, Boundary condition등 이 내포되어있어, 아직까지 확립된 이론이 존재하지 않는다. 인발저항력 추정을 위해 그 동안 수많은 시도와 노력이 있었음에도 불구하고, 현장 인발시험이 현재 지반설계에 가장 적합한 방법으로 지금까지 통용되고 있는 실정이다. 쏘일네일설계시 요구되는 몇가지 중요한 문제들을 제기하고 그에 대한 나름대로의 해석과 결론을 제시하였다.