• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 춘계학술대회논문집
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• pp.42-45
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• 1997

Weldline movement of tailored blanks originates from two sources, primary and secondary. Primary movement occurs by geometrical reason, that is, just scratched lines on the no-weld blanks move during drawing to be fitted to geometrical change. Secondary movement is induced by the characteristics of tailored blanks itself. The primary movement was mainly dependent on the weldline location and not affected by the type of material. The secondary movement caused by laser welding and/or small strength difference in this study was not dominant compared with primary movement. The formability of tailored blanks always inferior to those of original blanks. This is due to the existence of hardened weld bead. The closer a weldline is to punch corner where drawing is most active, the worse its formability becomes. This is because the weldline prohibits the drawing process. It was confirmed by measuring diagonal length at the blank corner. The mode of fracture was changed form wall break to draw break when the weldling was close to the punch corner.

• 대한의용생체공학회:의공학회지
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• 제3권1호
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• pp.17-22
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• 1982

In this paper, peak velocity characteristics of saccadic eye movements were measured and analyzed as a velocity characteristics of horizontal saccadic eye movement system. Measurements were made with an infrared reflection method, and horizontal saccadic eye movements of 5 normal subject were recorded for the periodic and random pulse targets of 5$^{\circ}$, 10$^{\circ}$, 20$^{\circ}$ , and 30$^{\circ}$ amplitudes.

• 대한인간공학회지
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• 제19권2호
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• pp.47-61
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• 2000

To study the characteristic of the weight center control of humans, the tracking control capability of circular and wave motion by weight center movement was conducted by using the force platform. The control performance(the integrated value of the $|Object\;value(X)-Control\;Value(Y)|^{2}$) and control trace record was used to evaluate the individual performance characteristics. The size of the population for this study was 73, which consisted of engineering students, students majoring in taekwondo, students majoring in dance, all of which were in their twenties, and also people in their sixties. The results of this study indicate that the weight center control characteristics of humans can be represented by the evaluation method and values. People who were capable of tracking the object did not stop nor overshot the objective. In addition, habits or training characteristics and aging seemed to influence the performance of the subjects. In the future, development of different objectives for weight center control could be used to determine the severity of the disease of the subject and the effects of the treatment.

• 한국환경과학회지
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• 제24권7호
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• pp.939-946
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• 2015

Hydraulic conductivity is an important parameter in the analytical model of groundwater. This study analyzed the groundwater movement characteristics by estimating optimal parameters according to hydraulic conductivity input methods with the MODFLOW model which is widely used. It first estimated the optimal parameters by dividing hydraulic conductivity zones by attitude. Next, it estimated optimal parameters by geological characteristic. It analyzed the groundwater movement characteristics by applying the recharge quantity and amount of evapotranspiration of drought periods and flood years with the estimated parameters. As the result was analyzed that there are differences of observation water level values according to hydraulic conductivity input methods but there is no big differences of overall groundwater movement characteristics by hydraulic conductivity input method, the two methods have found to be applicability in analyses of groundwater. So, it is judged that studies on more exact application of hydraulic conductivity and the application methods are needed.

• 한국융합학회논문지
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• 제11권4호
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• pp.87-93
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• 2020

본 연구는 신체적 특성과 기능적 움직임 검사(FMS)의 융합적 상관관계에 대해 알아보고자 한다. 연구대상자는 정상 성인으로 193명을 대상으로 단일측정하였다. 자료분석은 SPSS 26.0 Ver 프로그램으로 T-검증을 실시하였고, 각 변수들 간 피어슨 상관계수로 분석을 하였다. 분석결과, 검사 방법 중 능동 뻗은 다리 올림 검사와 몸통 안정성 푸쉬업 검사 영역에서 성별 간에 유의한 차이가 나타났다(P<.05). 어깨 가동성 검사와 능동 뻗은 다리 올림 검사 영역을 제외한 나머지 FMS의 검사에서 체지방률과 부적 상관관계가 있었다. 능동 뻗은 다리 올림에서 여성이 기능적 움직임의 질이 높았으며, 몸통 안정성 푸쉬업에서는 남성이 기능적 움직임의 질이 높았다. 그러므로 남성은 하지의 유연성을 보강해야하며, 여성은 상체 근력과 몸통의 안정성 운동을 적용해야 한다고 판단된다.

• 한국분무공학회지
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• 제22권4호
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• pp.210-217
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• 2017

A gasoline direct injection engine has an intake air temperature can be lowered by the fuel vaporization in the combustion chamber increase the volume efficiency is high compression ratio. Therefore, study for injection rate and characteristics which influence mixture formation in combustion chamber is important. Movement of the injector needle has a direct effect on the injection of the fuel, such as formation of cavitation, the fuel injection rate, etc. Therefore, recent studies on the dynamic characteristics of the injector considering the movement of the needle have been reported, but it takes a lot of time and cost to experimentally confirm the movement of the needle inside the injector. In this study, AMESim, a commercial 1-D code, and Star-CCM+, a 3-D CFD code, were used to predict the dynamic performance of the injector with needle motion. In order to predict the movement of the needle under the high pressure, the result of the surface pressure distribution according to the movement of the needle was derived by using the morphing technique of flow analysis. In addition, we predicted the injection rate of the injector considering the movement of the needle in conjunction with the 1-D code. The injection rate of the injector was measured by the BOSCH's method and the results were similar to those of the simulation results. This method can predict the injection rate and injection characteristics and this result is expected to be used to predict the performance of gasoline direct injection engines with low cost and time in the future.

• 한국보육지원학회지
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• 제14권2호
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• pp.19-38
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• 2018

Objective: This study explores how pre-service teachers' knowledge changed in the field of movement education and the characteristics of the instruction they perceived during a 15-week course. Methods: The drawing of concept maps and interviews were used to discuss how pre-service teachers' knowledge changed and the characteristics of the course. Results: The results showed that the pre-service teachers interrelated concepts in a more systematic way, and the concepts they used were increased while master concepts were decreased, indicating that their knowledge changed in a far more hierarchical order after the class. Characteristics of the course that led to a change in their knowledge appeared under the proper guidance of a professor. This was well demonstrated by feedback and evaluation at the stage of planning instruction and simulation teaching. Conclusion/Implications: The study demonstrated that the proper guidance of a professor was a useful tool for fostering the professional development of pre-service teachers in regard to constructing knowledge in movement education.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 춘계학술대회 논문집
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• pp.255-261
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• 2004

본 논문에서는 진해만에서 수질환경에 대한 현장관측조사를 통하여 진해만 수질현황에 대한 해수유동 시뮬레이션을 실시하여 대상해역의 유통특성을 파악하고, 계산된 유통data를 이용하여 해양오염시뮬레이션을 행하였으며 해수유동시뮬레이션 결과를 해양조사원에서 실시한 조석 및 조류관측 자료를 이용하여 시뮬레이션 결과를 검증하였으며, 유통결과를 해양오염 시뮬레이션의 유통 입력 자료로 이용하였다. 해수유통 Data 및 해양관측 Data를 이용하여 수질확산시뮬레이션을 행하여 실측데이터와 비교분석하여 COD농도 분포를 계산하여서 진해만의 수질특성을 파악하고자 하였다.

• 한국멀티미디어학회논문지
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• 제24권8호
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• pp.1178-1183
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• 2021

Based on the camera movement on image expression and grammar, this study intended to analyze the characteristics of image expression filmed and broadcasted by drones. This study analyzed drone images using the movement characteristics of existing video cameras as a coding nomenclature. These were intended to examine the differences from existing video grammar and their implications. This study conducted a content analysis using the entire population of drone news footage broadcast for four years in 2015, 2016, 2017 and 2018 by TV Chosun. The size of the screen, camera work, duration of the shot, camera angle, etc. were selected and analyzed. As a result, the drone camera work showed that it uses the most dolly shots in the case of camera movement, followed by the drone camera movement in the order of pan and tilt shots. For zoom, the frequency of use was the smallest. In addition, this study analyzed the size of the screen, duration of the shot, and camera angle of drone. Analysis shows that drones use certain camera movements most frequently, and unlike grandiose modifiers such as "extension of human gaze," drone remains as a supplementary means to enhance the traditional media expression.

• 대한치과교정학회지
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• 제48권6호
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• pp.405-411
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• 2018

Objective: This study was performed to investigate the rate of tooth movement and histological characteristics of extraction sockets those were subjected to corticotomy. Methods: A split-mouth randomized controlled trial experiment was designed. Thirty-two adult, male Wistar rats were divided into 2 groups: healing extraction socket (H) and recent extraction socket (R); these groups were randomly classified into 4 subgroups (0/7/21/60 days). The first maxillary molar was extracted on 1 side and 2 months were allowed for complete bone healing; then, the corresponding molar was extracted on the other side and surgical intervention was performed at the mid-alveolar point of the first maxillary molar. Ten grams of continuous force was applied. The outcomes measured were rate of tooth movement, percentage of periodontal space and histological evaluation. The rate of tooth movement was calculated as the measured distance divided by the duration of molar movement. Histomorphometric evaluations were performed on the second and third maxillary molars. The Wilcoxon signed rank test was used to compare differences between the two groups. Results: There were no significant differences in the rates of tooth movement between H and R groups at any of the 4 time points. The histological appearance and percentage of periodontal space between the R and H groups also demonstrated no significant differences. Conclusions: The rates of orthodontic tooth movement into recent and healed socket sites did not differ between the groups. Histological analysis of tooth movement revealed regional acceleration during every time period.