• Title/Summary/Keyword: 교차조사

Search Result 1,034, Processing Time 0.038 seconds

A Study on Velocity Distribution Around Ship Stern by Improved Power Law Flow Model (멱법칙 유동모델의 개선에 의한 선미 유동장내 속도분포 연구)

  • 김시영
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.16 no.7
    • /
    • pp.1391-1397
    • /
    • 1992
  • Improved power law flow model was suggested for the calculation of wake flow characteristics around the three dimensional ship stern in case of the formation of bilge vortex in the direction of stern. In comparison with the power law and Coles flow model, the flow velocity calculated based on this study was delayed around the boundary of inner layer and outer layer in reverse flow. More accurate results was obtained with this improved power law flow model by the velocity calculation around ship stern. Accuracy was validated with the comparison of other calculation results and experimental datas.

경남 밀양지역에서 지구통계기법을 이용한 최적의 지하수위 분포도 작성

  • 김태형;정상용;강동환;이민희;권해우;유인걸;유영준
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2003.09a
    • /
    • pp.222-226
    • /
    • 2003
  • 경남 밀양지역의 대수층별 지하수위 분포 특성을 파악하기 위하여 2002년 봄에 총 503개 지하수공을 대상으로 지하수위를 측정하였다. 조사된 자료는 수치가 낮은 지점들에 집중되어 있어 정규분포를 이루지 않으나, 대수변환 된 자료는 정규분포를 나타내었다. 표고와 천층 및 심층 지하수위의 회귀 분석을 실시한 결과, 모두 정(+)의 상관관계가 높은 것으로 나타났다. 베리오그램 분석이나 교차 베리오그램 분석 결과, 원시자료보다 대수변환 된 자료가 반베리오그램이나 교차 반베리오그램의 적합선에 더 잘 맞는 것으로 나타났다. 교차 타당성 분석 결과, 천층 지하수위에 대한 정규크리깅 및 코크리깅 모델링에서 원시 자료가 대수변환 된 자료보다 추정치에 더 가깝게 나타났고, 심층 지하수위에 대한 정규크리깅 및 코크리깅 모델링에서는 원시 자료보다 대수변환 된 자료가 추정치에 더 가깝게 나타났다. 정규크리깅이나 코크리깅을 이용하여 작성된 대수층별 지하수위 등고선도에서 등고선의 분포는 대체로 비슷하지만, 코크리깅에 의해 작성된 지하수위 등고선도가 정규크리깅에 의한 지하수위 등고선도보다 더 정밀한 것으로 나타났다. 이것은 원시 자료뿐만 아니라 대수변환 된 자료를 이용한 지하수위 등고선도에서도 같은 결과가 도출되었다.

  • PDF

The effectiveness of MRI evaluation after anterior cruciate ligament reconstruction using hamstring tendon autograft (자가 슬괵건을 이용한 전방십자인대 재건술 후 결과 판정에 있어 MRI 검사의 유용성)

  • Kim, Jin-Goo;Kim, Young-Woo;Lee, Soo-Won;Shim, Jae-Chan;Oh, Soo-Jin
    • Journal of the Korean Arthroscopy Society
    • /
    • v.12 no.1
    • /
    • pp.32-39
    • /
    • 2008
  • Purpose: To evaluate the effectiveness of MRI after ACL reconstruction with femoral tunnel at 10 o'clock position. Materials and Methods: MRI findings of 29 patients after ACL reconstruction using hamstring tendon autograft were evaluated. The mean period from operation to MRI was 18.9 months($7{\sim}40$ months). Signal intensity, morphology and continuity of graft, femoral insertion, graft angle, roof impingement, cross pin breakage and position were evaluated. Those findings were compared with KT-2000, Lysholm knee score and pivot shift test. Results: There was no significant correlation between signal intensity of graft and the duration to MRI. Most common pattern of the morphology was straight, and the continuity was well-preserved. 13 cases of femoral tunnel insertion were zone 4 and 16 were zone 3. There were no roof impingement. 10 cases showed cross pin breakages, of which 5 were found at the outside of distal femoral posterior cortex. 9 showed cross pin directed posteriorly in axial view. There was no significant correlation between clinical results and cross pin breakage. Conclusion: MRI examinations after ACL reconstructions are useful to evaluate the graft status, position of the graft and cross pins. Since the direction of the cross pin is important especially in 10 o'clock femoral position, care should be taken to avoid cross pin breakage.

  • PDF

Inheritance and Cross Resistance of Bifenazate Resistance in Twospotted Spider Mite, Tetranychus urticae (Bifenazate 저항성 점박이응애의 유전과 교차저항성)

  • Yu Jeong-Soo;Seo Dong-Kyu;Kim Eun-Hee;Han Jong-Been;Ahn Ki-Su;Kim Gil-Hah
    • Korean journal of applied entomology
    • /
    • v.44 no.2
    • /
    • pp.151-156
    • /
    • 2005
  • The development of resistance to bifenazate (resistance ratio of egg=40.3 folds) was found in population of the twospotted spider mite, Tetranychus urticae, collected from rose greenhouses in Chilgok, Gyeongbuk Province in December 2000. This population was selected for 4 years with bifenazate treatment (over 150 times), and showed 248.8 folds increase in resistance as compared to susceptible (S) strain. Inheritance of bifenazate resistant strain (R) and cross resistance of this strain to 9 acaricides were investigated. There were differences of susceptibility in the bifenazate concentration-mortality relationships in F1 progenies obtained from reciprocal cross with the S and R strain $(R{\times}S,\;S{\times}R)$. Degrees of dominance were 0.48 and 0.94 in adult females and eggs of $R{\times}S$ and -0.85 and -0.17 in adult females and eggs of $S{\times}R$, respectively. Inheritance type in the F1 progeny of $R{\times}S$ was incomplete dominant, and F1 progeny of $S{\times}R$ was incomplete recessive. These results suggest that inheritance of bifenazate resistance is controlled by a complete dominance. The R strain exhibited cross resistance to acequinocyl and fenpyroximate in adult females, and amitraz, emamectin benzoate, fenpyroximate, milbemectin, pyridaben and spirodiclofen in eggs. However they showed negatively correlated cross-resistance to emamectin benzoate and milbemectin in adult females, and abamectin in eggs.

Estimation of the Through Car Equivalent for Left-Turn Movement According to the Left-Turn Curve Radius in the Signalized Intersection (신호교차로에서 곡선반경에 따른 좌회전의 직진환산계수 산정)

  • 오영태;김기형
    • Journal of Korean Society of Transportation
    • /
    • v.19 no.2
    • /
    • pp.21-28
    • /
    • 2001
  • This study is to estimate the through car equivalent for left-turn movement according to left turn radius in the signalized intersection. The saturation flow rate for left-turn movement in 92' KHCM(Korea Highway Capacity Manual) is the same as that for through movement in the signalized intersection where the left turn radius is over 20m. This study uses Duncan 'Test's Test in order to find out the saturated position for queued vehicle in the signalized intersection. It found that the saturated flow rate of left-turn movement in the signalized intersection is less than that of through movement where the left-turn radius is less than 20m. It found that the through car equivalents for left-turn movement according to left-turn radius(8m-20m) are between 1.05 and 1.14.

  • PDF

Debate Competence and Strategy (토론 능력과 토론 전략)

  • Jang, Young-Hee
    • The Journal of the Korea Contents Association
    • /
    • v.9 no.2
    • /
    • pp.446-452
    • /
    • 2009
  • This study on strategy and its function in debate offer the materials of education concrete and practical to be able to improve the expression ability and comprehension ability of the students, and can give lots of help to improve the ability of application that can answer quickly in trouble circumstances. The type of strategy in the course of set up the theory are (1) the form of concept definition, (2) the form of solution offer, (3) inductive form and deductive form, (4) the form of example offer. The type of strategy in the course of contradict are (1) the form of soliloquy, (2) the form of claim comparison, (3) the form of partial recognition. The type of strategy in the course of cross examination are (1) the form of question in return and contradict, (2) the form of partial consent contradict. We believe this study will improve the communication ability and negotiation ability and also make a great contribution to improve the leadership of 21-century type if this study will be used in the field of education.

Step-by-Step Strategy in Debate (토론에서의 단계별 대응전략)

  • Jang, Young-Hee
    • The Journal of the Korea Contents Association
    • /
    • v.7 no.10
    • /
    • pp.36-43
    • /
    • 2007
  • This study on strategy and its function in debate offer the materials of education concrete and practical to be able to improve the expression ability and comprehension ability of the students, and can give lots of help to improve the ability of application that can answer quickly in trouble circumstances. The type of strategy in the course of set up the theory are (1) the form of concept definition, (2) the form of solution offer, (3) inductive form and deductive form, (4) the form of example offer. The type of strategy in the course of contradict are (1) the form of soliloquy, (2) the form of claim comparison, (3) the form of partial recognition. The type of strategy in the course of cross examination are (1) the form of question in return and contradict, (2) the form of partial consent contradict. We believe this study will improve the communication ability and negotiation ability and also make a great contribution to improve the leadership of 21-century type if this study will be used in the field of education.

A longitudinal study of the stress factors of parents between psychological maladjustment and the risk of school interruption in multicultural adolescents: The Application of Autoregressive Cross-lagged Model (부모의 스트레스와 다문화청소년의 심리적 부적응, 학업중단위험 간 종단적 인과관계: 자기회귀교차지연모형 적용)

  • Lee, Hyoung-Ha
    • Journal of Digital Convergence
    • /
    • v.19 no.6
    • /
    • pp.373-385
    • /
    • 2021
  • In this study, the Korea Youth Policy Institute applied a self-registering model to verify the patterns of parental stress, multicultural youth psychological maladjustment, and interdependence between three factors by using five-point-time data tracked from middle school to high school. According to the analysis, First, Parent' stress at the time of the five surveys had a significant positive effect on the psychological maladjustment and the risk of academic interruption of multicultural adolescents at that point. Second, the psychological maladaptation of multicultural adolescents at the time of the previous five surveys had a significant positive effect on the risk of academic interruption at that point. Based on these analysis results, various support measures were proposed to cope with the stress of multicultural youth parents, and policy alternatives were proposed to prevent the risk of academic interruption by reducing the psychological maladjustment of multicultural youth.

The Injury and its Related Factors in the Elderly Using the Data of 2008 Community Health Survey (2008 지역사회 건강조사 자료를 이용한 노인의 손상 관련요인)

  • Kwon, Yu-Jin;Ryu, So-Yeon;Shin, Seung-Ok;Chun, In-Ae;Park, Moon-Sook;Shim, Jae-Soon
    • Journal of agricultural medicine and community health
    • /
    • v.39 no.1
    • /
    • pp.1-13
    • /
    • 2014
  • Objective: The objectives were to estimate the rate of the injury in the elderly over the past year and to identify factors related to injury in the elderly in South Korea. Method: Using data from the 2008 Community Health Survey, 43,049 elderly persons, aged 65 years and older, were selected as study subjects. Their experience of injury during the past year and other variables, including socio-demographic factors, health-related factors, and diagnosed chronic diseases, were used. The chi-squared test and multiple logistic regression analysis with weighted analysis were conducted and statistical significance was set at p<0.05. Result: The rate of injury in the elderly during the past year was 5.1%. The most common types of the injury were falling/slipping down and traffic accidents. Factors related to injury in the elderly were living alone, current drinking, depression, poor self-rated health, stroke, and osteoporosis. Living alone (odds ratio 1.23, 95% CI: 1.05-1.45), current drinkers (OR 1.19, 95% CI: 1.05-1.35), poor self-rated health (OR 1.72, 95% CI: 1.43-2.08), depression (OR 1.23, 95% CI: 1.17-1.68), and history of stroke (OR 1.40, 95% CI: 1.17-1.68), and history of osteoporosis (OR 1.45, 95% CI: 1.26-1.66) were related to an increased risk of injury. Conclusions: Intervention programs that consider the risk factors related to injury should be developed and implemented to decrease and prevent injuries in the elderly.

The Longitudinal Causal Relationship between School Life Adjustment and Life Satisfaction Among Adolescents: The Application of Auto-Regressive Cross-Lagged Model

  • Kim, Kyung Ho
    • Journal of the Korea Society of Computer and Information
    • /
    • v.26 no.4
    • /
    • pp.181-188
    • /
    • 2021
  • The purpose of the current study was to investigate the causal relationship between school life adjustment and life satisfaction among adolescents through longitudinal panel data. The current study analyzed the 1st through 7th wave data in the 4th grade panel of elementary school from the Korea Children and Youth Panel Survey (KCYPS). The research model was tested using auto-regressive cross-lagged model. The major results were as follows. First, adolescents' school life adjustment had a positive auto-regressive effect. Second, adolescents' life satisfaction had a positive auto-regressive effect. Third, adolescents' school life adjustment was a causal predictor of life satisfaction, but not vice versa. Finally, implications in terms of enhancing adolescents' school life adjustment and life satisfaction were also discussed.