• 복식문화연구
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• 제16권6호
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• pp.1087-1098
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• 2008

The purpose of this study is to conduce the survey of three groups of college women living in different residential districts, Seoul, Gyeonggi-do and a district, each other, analyze the actual condition of wearing blue jeans, comparative investigate actual condition in each residential district of wearing blue jeans and cognition by change of crotch length and trend through comparison of cognition on dressed blue jeans with short crotch length. By which investigation, it was intended to understand their condition and propose of blue jeans as may offer fit with short crotch length. As the result of this study, it presented college women had hipbone blue jeans in order of $2\sim3$ and more than 4 in all of residential districts, they purchased hipbone blue jeans with crotch length in order of for middle crotch(23 cm) and short crotch(21cm) commonly in all of residential districts, and they care a lot for exposing back waist and hip of hipbone blue jeans without reference to residential district. They had a bad feeling for exposure, and as an alternative to deal with this, they answered mostly on 'wearing hipbone underwear' or 'wearing long upper garment', and there was significant difference between residential districts in silhouette and exterior fitness of crotch length among important factors when wearing hipbone blue jeans.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1211-1215
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• 2005

In the GPS attitude determination system, the baseline length constraints can be used efficiently to reduce the search space. It is possible by adopting the assumptions that the baseline length doesn't change and the true baseline length is precisely known. But in real situation, the baseline length might be changed by many reasons and it is impossible to measure the true baseline length because there exists measurement error and antenna phase centre movement. In order to analyze the effect of the baseline length accuracy, one needs to know the relation between the accuracy of the baseline length and success rates of the integer ambiguity resolution. In this paper, the effect of the baseline length accuracy to the integer ambiguity resolution in the attitude determination system is analyzed by empirical method. The results show that the margins in the baseline length accuracy is less than a few cm which implies that one should take great cares when applying the attitude determination system to the flexible structures.

• Journal of the Korean Data and Information Science Society
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• 제22권3호
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• pp.549-553
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• 2011

In this paper, we deal with the problem of deciding the length of data for estimating the parameters in geometric Brownian motion. As an approach to this problem, we consider the change point test and introduce simple test statistic based on the cumulative sum of squares test (cusum test). A real data analysis is performed for illustration.

• 대한지구과학교육학회지
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• 제10권3호
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• pp.254-261
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• 2017

이 연구는 계절 변화에 대한 초등학생들과 벨리즈 초등교사의 선개념을 조사하고 계절 변화의 원인을 이해하는데 도움이 되는 실험을 고안한 것이다. 계절 변화에 대한 선개념을 알아보기 위해 계절변화를 학습하지 않은 초등학교 6학년 91명의 학생과 벨리즈 초등교사 10명을 대상으로 개방형 질문지와 인터뷰를 실시하였으며, 귀납적 분석법을 이용하여 범주화하였다. 초등학생과 벨리즈 초등교사는 계절 변화의 원인을 지구의 자전, 태양과 지구 사이의 거리, 지구의 공전, 환경오염이나 기후변화 등으로 생각하고 있었다. 그리고 이러한 오개념은 공간 인식에 대한 어려움, 교과서나 교재의 부정확함 등에 기인하는 것으로 나타났다. 계절 변화에 대한 부정확한 선개념을 바로 잡고 계절 변화 수업을 개선하기 위하여 지구 자전축의 기울기에 따른 태양의 남중 고도와 낮과 밤의 길이를 측정하고, 이를 비교하는 실험을 고안하였다. 이 실험은 태양의 남중 고도와 낮의 길이 변화와 같은 자연 현상을 모형을 통해 측정할 수 있도록 하여 계절변화의 원인을 이해하는데 도움을 줄 수 있다.

• The Korean Journal of Ecology
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• 제26권5호
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• pp.247-250
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• 2003

The investigation of ecological characteristics of Lycoris radiata was carried out in flooding (site I), half flooding (site II) and dry stands (site III). Seasonal change of air temperature showed similar patterns and that of light intensity showed quite difference among three L. radiata stands. Seasonal change of soil water content showed a great difference among three L. radiata stands. The study area was dominated by Pinus densiflora, P. thunbergii and L. radiata communities. The number of bulb in 1. radiata increased in September with bulb formation and decreased in January. Bulb weight in L. radiata was different from each site. The numbers of blossom were 23, 13 and 9, respectively in site I, II and III. The length of wreath were 17.0, 13.0 and 11.0cm, respectively, the length of stamen were 7.0, 6.4 and 6.5 cm, respectively and the length of stalk were 60.0, 45.0 and 42.0 cm, respectively in site I, II and III. The leaf of L. radiata developed rapidly in site I with sufficient water supply and lower light intensity, the number and the length of rootlets increased considerably in site III with insufficient water supply and higher light intensity, and the ecological characteristics in site II was intermediate between site I and site III. There was no great difference between the numbers of rootlets in site I and site II, which were due to sufficient water supply in two stands.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 Proceedings of The 6th korea-china joint workshop on nuclear waste management
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• pp.258-268
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• 2005

A new approach has been adopted to remove the hot particulates from nuclear facilities, KAERI, South Korea, by using the new compact cyclone train, made of steel ness steel, with optional vortex finder length. Flow rate results showed a dramatic change in removal efficiency, performance was changed with the change of exit tube length. The 15 m/s flow rate was found suitable one for new equipment with the 49 mm optimum exit tube length for 76 mm cyclone body diameter. Results shows the removal efficiency for $1\;{\mu}m$ was more than $65\%$ and for $10\;{\mu}m$ was seen ${\~}97\%$. Over 15 m/s flow rate, was not shown much different in removal efficiency. The removal efficiency increased with the flow rate, and pressure drop. Cut size diameter decrease with the inlet flow rate. Cut size diameter found lowest with 49 mm exit tube length and 15 m/s flow rate. For filters the performance decreased with the inlet velocity increased.

• The Journal of Korean Physical Therapy
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• 제28권6호
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• pp.393-397
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• 2016

Purpose: This study was conducted in an effort to determine the effects of various abdominal drawing-in maneuver (ADIM) on the thickness and length of the transversus abdominis (TrA) when using lumbar stabilization exercises on healthy adults. Methods: 72 healthy adults were divided into four groups of 18 subjects each, to which different ADIM methods were applied. 1) a simple ADIM exercise, 2) an ADIM with pressure bio-feedback units, 3) an ADIM exercise with sling, and 4) an ADIM exercise with sling and vibration. Changes in the thickness and sliding length of TrA were measured when ADIM was conducted in the supine position prior to exercise and again when beginning the exercises. Following exercise, changes in the thickness and sliding length of TrA were measured using the same methods. Differences in group measurements prior to and following exercise were compared using a one-way analysis of variance. A paired t-test was applied to compare the before and after differences within each group. Results: Differences in TrA thickness change revealed that the ADIM exercise with sling and vibration group showed a significant difference in measurements taken prior to and following exercise. Differences in TrA length change revealed that the ADIM exercise with sling and vibration group showed a significant difference in measurements taken prior to and following exercise. Conclusion: ADIM exercise with vibration stimulation conducted in the bridge posture while in a prone position using a sling can be recommended as an effective exercise to improve the function of lumbar TrA.

• 한국생활과학회지
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• 제6권2호
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• pp.121-131
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• 1997

This study was to design the clean room garment which fits for a body and adjusts well to the action. We examined the body's changes in action through a body measurment and made a sample of the clean room garment to which had adapted the body's changes in action and evaluated the function and the appearance compared with the existing the clean room garment. The followings were summery of the results : 1. Back intersyce breadth decreased, trunk length increased and the other parts were not change. At a posture of raising hands($M_3$) in comparison with an upright posture($M_0$). Back intersyce breadth, hip length and knee length increased and the other parts were a little change. At a bowing posture($M_2$) in comparison with an upright posture($M_0$). Back hip girth, knee length, hip length and leg length increased and the other parts were not change. At a working posture on a chair($M_1$) in comparison with an upright posture($M_0$). 2. The overall clean room garment was made increasing on the changes of part of a body through measuring and body measurement. 3. From the test of the function, it became known that the devised clean room garment was superior to the existing one in the parts of neck, shoulder, armpit and elbow at a working posture on a chair($M_1$), in the parts of neck, shoulder, and armpit at a bowing posture($M_2$), and the armpit at a posture of raising hands($M_3$). The appearance was better on the whole. 4. From the examination of photographs, the waist line of the devised clean room garment was not so much pulled up as that of the existing one on moving. And when sitting down on a chair, the waist line of the existing one was pulled down while that of the devised one had no change. As above, we investigated the actual conditions of wearing the clean room garment and measured the body's changes according the various actions. So we applied these results to the devised clean room garment but we couldn't research the clean mom effect of it owing to not obtaining the measuring instrument. The aspect of ergonomics liked the feeling of wearing and fitted to the action must be given consideration to the clean room garment, and simultaneously the dust-resistant effect must be taken into consideration in order to improve the quality of the goods. Therefore, we think it should be continued the research on the dust-resistant effect, material, washing method, quality control, and size along with the aspect of ergonomics.

• 대한치과교정학회지
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• 제38권4호
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• pp.283-298
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• 2008

본 연구는 악교정수술을 받은 골격성 III급 부정교합자의 치료 전, 후의 하악치열궁 변화를 관찰하고, 이들이 초진 시의 측모두부방사선 규격사진 및 석고모형과 어떠한 상관성을 가지고 있는지를 알아보기 위해 골격성 III급 부정교합자로 진단받은 31명(남자 14명, 여자 17명, 평균 $21.8\;{\pm}\;3.3$세)을 대상으로 치료 전, 악교정수술 전, 악교정수술 후 채득한 측모두부방사선 규격사진과 치료 전, 후의 석고모형을 계측하여 상관분석과 회귀분석을 시행하였다. 연구 결과 Mn-LMMC, Mn-LIE, Mn-MnOcc는 술전교정치료에 의한 유의한 차이를 보이지 않았다. 치료 전의 계측치와 치료 후 변화된 계측치와의 상관관계에서는 치열궁공간부족(ALD)은 ICW, IPW1의 변화량과 순상관관계(r = 0.492, 0.615)를 보였으며, 치열궁장경(arch length)의 변화량과도 순상관관계(r = 0.641)를 보였다. 그러나 Spee 만곡은 전치부치축 각도 변화와 치열궁 폭경 및 장경 등 각각의 변화량과는 상관관계를 보이지 않았다. 이를 이용하여 회귀분석을 시행한 결과, 술전교정 후 Arch length, IPW1의 변화량은 치료 전의 계측치로 각각 64.0%, 75.8%를 설명할 수 있었다. 이상의 연구에서 골격성 III급 부정교합자의 치료 전, 후의 변화량과 치료 전 측모두부방사선 규격사진 및 석고모형 간에 관련성이 있었고 악교정수술을 동반한 교정치료 계획을 수립할 때 술전교정치료의 목표 설정과 악교정수술 결과의 예측에 도움이 될 것으로 판단된다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.932-939
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• 2011

This paper deal with technique of tension length calculation for 350km/h high speed catenary system. Tension length affects in facility investment. Possibility of overlap increasing a tension length and the equipment investor decreases in order to decrease. Considers the parameter which specifies and the grudge which is possible long the fact that decides a tension length is the aim which is important plans overhead contact line. The element which decides a tension length with next following; (i) Operating range of tension device, (ii) Change of the horizontal tension which affects possibility of the effect which operates to the line and span, (iii) Tension of wire material the tensile force which is relation, (iv) Wire thermal expantion which relates with a standard temperature, (v) Curve radius, (vi) Wind velocity, (vii) Thermal range of overhead contact wire and mechanical design of tension mechanism etc.