• 운동영양학회지
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• 제13권3호
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• pp.203-209
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• 2009

Periventricular leukomalacia (PVL) is a common white matter lesion affecting the neonatal brains. PVL is closely associated with cerebral palsy (CP). It has been suggested that maternal or placental infection can induce damage to the neonatal brains. In the present study, we investigated the effects of treadmill running and swimming of rat pups on the GFAP and MBP expressions in the brains of rat pups with maternal lipopolysaccharide (LPS)-induced CP. The rats were divided into the six groups for experiment 1: the control group, the control with mild exercise group, the control with moderate exercise group, the LPS-treated group, the LPS-treated with mild exercise group, and the LPS-treated with moderate exercise group (n=6 in each group). The rats in the running groups were forced to run on a motorized treadmill for 30 min 5 times a week for 4 weeks. For experiment 2, the rats were divided into four groups: the control group, the LPS-treated group, the LPS-treated with swimming group, and the LPS-treated with treadmill running group (n = 5 in each group). The rats in the swimming group were made to swim for 30 min once a day for 5 times per week during 2 weeks. The rats in the treadmill running group were made to run for 30 min once a day for 5 times per week during 2 weeks. The present results showed that intracervical maternal LPS injection during pregnancy significantly increased GFAP expression in the striatum and significantly decreased MBP expression in the corpus callosum of rat pups. The present results also showed that treadmill running and swimming significantly suppressed GFAP expression and significantly enhanced MBP expression in the brains of rat pups with maternal LPS-induced CP. This effect of treadmill running was shown as equally both in the mild-intensity exercise and in the moderate-intensity exercise. The present study revealed that exercise, both the treadmill running and swimming, is effective for the treatment of astrogliosis and hypomyelination associated with CP. Here in this study, we showed that treadmill running and swimming are effective for alleviating the detrimental effects of CP.

• 복식
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• 제65권3호
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• pp.151-166
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• 2015

This research aims to study the needs of the trail runners as trail running has become a popular outdoor activity, and give suggestions for high functional outdoor menswear design that can satisfy the needs of the highly demanding taste of runners. The design development is as follows: 1) The design had to be made of lightweight material and be easily packable in all situations, and 2) we also considered the ergonomic and compact fit for activity, 3) the functional location of high functional fabric, 4) the reflective use and layering system giving a wide range of outdoor workout time and 5) the trend in 2016 S/S active sports and outdoor wear. Based on the above elements, the men's outdoor wear design has been developed for trail running in spring and summer. The design development includes a total of 7 items. The design focused on lightweight, availability of packaging, "comfortability" and freshness in activity, functional suitability of location of highly functional materials and the layering system to protect body temperature under the changing environment. In particular, the layering system was implemented to provide ventilation, and it was done in body parts that released the most body heat. Therefore, mesh materials were actively used on the side panel, sleeves and center of the back piece for necessary sweat emission without any problems and ventilation for trail running.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1905-1913
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• 2011

The dynamic characteristic of bogie that is driving system of railway vehicle is very important regarding decision of vehicle characteristics as running safety and comport. The dynamic characteristic test of bogie is tested on full size in place on field testing on track. But, the testing on the full size caused many problems. To overcome these problem by full size test, the Railway Safety Research Center in Seoul National University of Science & Technology developed 1/5 scale size of small scale derailment simulator and is currently testing running stability of 1/5 scaled bogie. Also To take effectively advantage of running stability test using small scale derailment simulator in actuality design and reliability estimation, it is necessary comparison and examination with field test and theoretical analysis result In this paper. to achieve running stability analysis of 1/5 scaled bogie on small scale derailment. the program using MATLAB that is fast compose and analysis the motion equation of Saemaul power bogie is developed. It is achieved analysis according to various specification (weight, size, suspension, etc..) and is evaluated corelation between test result and dynamic characteristic of actual railway vehicle.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 학술대회지
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• pp.772-775
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• 2004

Generally, arterial pulse waves are measured at the radial arterial of wrist or carotid arterial of neck using a sensor such as pressure sensor, piezoelectric sensor or optic sensor. But in this paper, arterial pulse wave is measured at the temple using PZT piezo sensor which is attached on the temple in form of a hair-band. Arterial Pulse waves are generally measured when a reagent is in a static state. But in this paper, we implemented the arterial pulse wave measurement system, as a previous stage of the arterial pulse wave measurement system for running at outdoors or on a running machine, that measures arterial pulse waves at the temple, which is the least moving part when running. Thorough the continuous study, if the motion artifact when running is possible to be removed, the system will be able to perform monitoring of running men's states and especially emergency signals such as serious pulse waves of an/old and feeble persons and handicapped persons.

• Child Health Nursing Research
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• 제13권3호
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• pp.338-348
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• 2007

Purpose: This study was done to identify risk factors influencing high school students to runaway from home. A comprehensive analysis of individual, family and social environment-related factors was done. Method: The participants in this descriptive survey on causal relations were 974 students enrolled in high school who were selected by convenience sampling. The data collected in June and July, 2003 were put in to logistic regression analysis to build a prediction model. Results: 1) Individual-related factors for running away in high school students were experience with smoking and sexual intercourse. 2) Family-related factors for running away in high school students were economic status and physically ill-treatment of the types of ill-treatment. 3) social environment-related factors for running away in high school students were number of delinquent friends. Conclusions and Recommendations: Running away from home among Korean high school students was associated not only with individual factors, but also with family and social environmental factors. The findings of study suggest that board intervention programs should be provided to prevent running away form home by adolescent. It is also recommended that a program be developed that can help control the variables identified in this study along with follow up study to verify the model.

• 한국안전학회지
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• 제27권1호
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• pp.86-95
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• 2012

The BWIM(Bridge Weigh-In-Motion) is a technology to identify vehicle properties, such as weight, speed, axle spacing and running lane, passing over a bridge by using dynamic response of bridge member. Such information will be used for assessing durability and establishing a maintenance strategy of roadway structures. In this paper, as a first step for developing BWIM system, analytical and experimental studies were conducted in order to verify whether the response of vertical stiffener in steel girder bridge can be used to identify vehicle properties running on the bridge. It was known from this study that such vehicle information could be estimated reasonably by using strain time history curve of a vertical stiffener due to running vehicles. It is because the effect of each axle-load of vehicle appears definitely in the curve. However, as the magnitude of strain of vertical stiffener is effected by running pattern of vehicles, further study is necessary to reduce error when estimating vehicle weight.

• 한국측량학회지
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• 제14권2호
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• pp.229-239
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• 1996

교통기관으로서의 역할을 충분히 수행하기 위해서 철도속도향상을 통한 운행시간 단축은 인간의 생활양식 고급화 및 시간가치의 증대로 인해 절실히 요구되는 사항으로 부각되고 있다. 특히 열차운행속도에 매우 큰 영향을 주는 선형 요소는 곡선구간으로서, 우리나라의 경우 곡선구간이 많은 비율을 차지하고 있어 이 구간에서의 속도향상은 전체구간의 운행시간을 단축시킬 수 있기 때문에 우리나라의 선형에 대한 특성을 고려하여 곡선부 전체구간에 걸쳐서는 선형을 지배하고 있는 요소의 개량 및 부분적 개량방법으로 사용되는 완화곡선 연장기법을 각 단계에 걸쳐 주행안정성 및 승차감의 지표로서 이용하고 있는 횡가속도 값을 적용하여 속도향상를 통한 운행시간 단축효과를 얻었다. 이 결과 우리나라 선형조건상 곡선부 전구간을 개량하는 것이 운행시간을 단축하기 위해서는 완화곡선의 연장 방법 보다 효과적임을 나타내고 있다.

• Structural Engineering and Mechanics
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• 제76권2호
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• pp.207-222
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• 2020

Due to the rugged terrain, metro lines in mountain city across numerous wide rivers and deep valleys, resulting in instability of high-pier bridge and insecurity of metro train subjected to fluctuating crosswind. To ensure the safe operation in metro lines in mountain cities, running safety of the metro train over the high-pier bridge under crosswind is analyzed in this paper. Firstly, the dynamic model of the wind-train-bridge (WTB) system is built, in which the speed-up effect of crosswind is fully considered. On the basis of time domain analysis, the basic characteristics of the WTB system with high-pier are analyzed. Afterwards, the dynamic responses varies with train speed and wind speed are calculated, and the safety zone of metro train over a high-pier bridge subjected to fluctuating crosswind in mountain city is determined. The results indicate that, fluctuating crosswind triggers drastic vibration to the metro train and high-pier bridges, which in turn causes running instability of the train. For this reason, the corresponding safety zone for metro train running on the high-pier is proposed, and the metro traffic on the high-pier bridge should be closed as the mean wind speed of standard height reaches 9 m/s (15.6 m/s for the train).

• 대한조선학회논문집
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• 제50권2호
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• pp.95-103
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• 2013

Prediction of the running posture is important to evaluate the resistance by the numerical calculation for a high speed vessel. Especially for a planing craft having a large variation of running attitude it becomes more essential, but it can not be obtained easily because the running posture and the hydrodynamic forces including the resistance are interacted with each other. So iterative calculation to obtain the dynamic forces according to the changes in attitude is necessary, in this study, considering the calculated hydrodynamic force at the assumed draft as the additional buoyancy the corrected draft is calculated through satisfying the equilibrium between the buoyancy and the hull weight. To verify the derived method three kinds of hull forms were used with the results of model tests, R/V ATHENA and 150 tons class guide vessel for middle-speed semi-planing crafts, 28 feet fast boat for a high-speed planing boat. For all cases with several iterations the converged value of draft can be obtained, lastly the resistance and flow around hull were simulated by using VOF method.

• 한국철도학회논문집
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• 제13권5호
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• pp.509-515
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• 2010

곡선부에서 도입되는 완화곡선은 곡률을 점진적으로 변화시킴으로써 곡선부에서의 차량의 주행안전성 및 승차감을 향상시킨다. 이러한 완화곡선은 클로소이드, 3차포물선 및 사인반파장 등 여러 종류가 있다. 본 논문에서는 차량의 주행해석을 통하여 3차 포물선과 사인반파장 완화곡선의 주행거동 특성을 분석하였다. 각 완화곡선별로 승차감 평가와 주행안전성 평가를 통하여 각 완화곡선의 성능을 정량적으로 비교하였다.