• Bulletin of the Korean Mathematical Society
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• v.54 no.6
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• pp.2149-2154
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• 2017

In this paper, we obtain a simple lower bound for the number of positive (resp. negative) crossings in oriented link diagrams in terms of the maximal (resp. minimal) degree of the Jones polynomial.

• Journal of the Korean Mathematical Society
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• v.13 no.1
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• pp.113-120
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• 1976

• Journal of the Korean Statistical Society
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• v.30 no.3
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• pp.529-539
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• 2001

This paper deals with the distributions of certain characteristics related to a symmetric random walk of an steps ending at an unspecified position, thus generalizing and extending the earlier work.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.370-377
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• 2015

This study attempted to examine the impact of musculoskeletal pain on pedestrian crossing using a sample that consisted of 282 aged people. The research method involved an examination of the musculoskeletal pain of the elderly using a musculoskeletal questionnaire. The subjects were also told to walk across four- and six-lane pedestrian crossings while their gait velocity, step count, and step time were measured. The research results for pain by body regions indicated that waist pain had the highest complaint rate(33.3%). When there was musculoskeletal pain in the waist and leg/foot, gait velocity also decreased and step count and step time increased. However, usage of a cane turned out to have a positive impact on pedestrian crossing. Nevertheless, no significant relationship between waist and leg/foot pain and pedestrian crossing characteristics was found. We expect there will be continuous further studies on the subject of diverse physical problems of the aged and pedestrian crossing.

• Journal of Environmental Impact Assessment
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• v.25 no.1
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• pp.1-14
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• 2016

With the continuous expansion of highway network and its traffics, neighboring wildlife habitats are splitted into smaller and more isolated patches. The infrastructures contribute to the wildlife-vehicle collision by creating barriers to animal movement. This kinds of traffic accidents are dangerous factors to the drivers' safety and the facilities on the highway as well as to the wildlife themselves. One of the most common ways to prevent habitat fragmentation are fauna crossings and fences. The cost of the mitigation measures to prevent wildlife-vehicle collision could be monetized. However their economic benefits are difficult to be measured. Using contingent valuation method, this study tries to estimate the economic valuation of wildlife collision prevention projects on the Korean highways. The result shows that 43.88% of Korean household had the positive willingness pay to the projects. Moreover, we found that the recognition of the project or the favourable attitude to the environmental issues could raise the willingness-to-pay. Therefore, active public relation on the project could make the friendly public opinion and increase the number of the household which has the positive willingness-to-pay on the project.