• International Journal of Automotive Technology
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• 제6권5호
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• pp.501-506
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• 2005

With the respective collapse characteristics of aluminum and CFRP (Carbon Fiber Reinforced Plastics) tubes in mind, axial collapse tests were performed for aluminum/CFRP compound tubes, which are composed of square or circular shaped aluminum tubes wrapped with CFRP outside. In this study, the collapse modes and the energy absorption characteristics were analyzed for aluminum/CFRP compound tubes which have different fiber orientation angle of CFRP. Fracture modes in the aluminum/CFRP compound tubes were rather stable than those in the CFRP tubes alone, probably due to the ductile nature of the inner aluminum tubes. The absorbed energy per unit volume of the aluminum or the aluminum/CFRP compound tubes was higher than that of CFRP tubes. Meanwhile, the absorbed energy per unit mass, for the light-weight design aspect was higher in the aluminum/CFRP compound tubes than in the aluminum tubes or the CFRP tubes. The energy absorption turned out to be higher in circular tubes than in square tubes. Beside the collapse modes and the energy absorption characteristics were influenced by the orientation angle, and the compound tubes took the most effective energy absorption when the fiber orientation angle of CFRP was 90 degrees.

• 간호행정학회지
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• 제22권4호
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• pp.396-405
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• 2016

Purpose: The study was done to investigate nurses' customer orientation, emotional labor, unit manager-nurse exchange and relational bonds and to identify the factors affecting nurses' turnover intentions. Methods: A cross-sectional survey was conducted using self-report questionnaires. The participants in this study were 276 nurses in tertiary hospital located in a metropolitan city, Korea. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficient and stepwise multiple regression with the SPSS program 22.0. Results: The mean scores were $3.74{\pm}0.90$ (out of 5) for turnover intention, $5.31{\pm}0.87$ (out of 7) for customer orientation, $4.82{\pm}0.96$ (out of 7) for emotional labor, $3.58{\pm}0.61$ (out of 7) for relational bonds, and $3.18{\pm}0.57$ (out of 5) for unit manager-nurse exchange. Factors influencing turnover intention were 'emotional labor' (${\beta}$=.39, p<.001), 'unit manager-nurse exchange' (${\beta}$=-.22, p<.001), 'financial bonds' (${\beta}$=-.19, p<.001), 'perceived economic status' (${\beta}$=-.15 p=.003) and 'career' (${\beta}$=.14, p=.005). These factors explained 34.9% of the variance in turnover intension (F=30.46, p<.001). Conclusion: Findings indicate that to reduce nurses' turnover intention in the hospital, there is a need to improve unit manager-nurse exchange and to manage strategies lowering nurses' emotional labor.

• 기본간호학회지
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• 제3권2호
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• pp.285-297
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• 1996

This study has been done for the purpose of investigating the degrees of death orientation and terminal care performance. The factors related to these two variables, and the relationship between death orientation and terminal care performance. The subjects of study were 128 nurses who implemented nursing care for terminally ill patients at C University Hospital in Kwang Ju city. The data were collected from March 13 to 19, 1996, by means of Death Orientation by Thorson Powell(1988) and Terminal Care Performance Scale by researcher. The data were analysed by t-test, ANOVA, Duncan test and Pearson's correlation coefficient. The Results of this study were summarized as follows : 1. The mean score of death orientation was 61.4. The degree of death orientation showed no significant difference depending on the general characteristics of nurses. 2. The mean score of terminal care performance was 45.5. In comparison of the degree of terminal care performance among three domains, the mean score of each item tended to show higher degrees in order of 'Psychological domain(2.4)', 'Physical domain(2.2)', 'Spiritual domain(1.9)'. 3. The degree of terminal care performance showed significant differences in age(F=11.48 p=.0001), marital status(t=10.49 p=.0015), religion(t=5.01 p=.0270), period of clinical experience(F=10.30 p=.0001) and ward unit(F=3.73 p=.0036). The degree of terminal care performance in physical domain showed significant differences in age(F=7.26 p=.0010), marital status(t=9.72 p=.0023), period of clinical experience(F=7.03 p=.0013), ward unit(F=6.23 p=.0001). The degree of terminal care performance in psychological domain showed significant differences in age(F=8.73 p=.0003), marital status(t=4.22 p=.0419), religion(t=5.59 p=.0196), period of clinical experience(F=6.36 p=.0023), ward unit(F=3.33 p=.0075). The degree of terminal care performance in spiritual domain showed significant differences in age(F=8.30 p=.0004), marital status(t=10.45 p=.0016), religion(F=5.41 p=.0216), period of clinical experience(F=8.80 p=.0003). 4. The relationship between the degrees of death orientation and terminal care performance showed no correlation(r=-.026 p=.7746).

• International Journal of Ocean System Engineering
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• 제1권3호
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• pp.165-170
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• 2011

In this paper, for the accurate estimation of the position and orientation of the UUV (unmanned underwater vehicle), an AHRS (Attitude Heading Reference System) was developed using the IMU (inertial measurement unit) sensor which provides information on acceleration and orientation in the object coordinate and the initial alignment algorithm and the E-KF (extended Kalman Filter). The initial position and orientation of the UUV are estimated using the initial alignment algorithm with 3-axis acceleration and geomagnetic information of the IMU sensor. The position and orientation of the UUV are estimated using the AHRS composed of 3-axis acceleration, velocity, and geomagnetic information and the E-KF. For the performance test of the orientation estimation of the AHRS, a testbed using IMU sensor(ADIS16405) and DSP28335 coded with an E-KF algorithm was developed and its performance was verified through tests.

• Journal of the Optical Society of Korea
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• 제15권1호
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• pp.15-21
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• 2011

This paper proposes a new approach to palmprint verification based on the gradient, in which a palm image is considered to be a three-dimensional terrain. Principal lines and wrinkles make deep and shallow valleys on a palm landscape. Then the steepest slope direction in each local area is first computed using the Kirsch operator, after which an orientation map is created that represents the dominant slope direction of each pixel. In this study, three orientation maps were made with different scales to represent local and global gradient information. Next, feature matching based on pixel-unit comparison was performed. The experimental results showed that the proposed method is superior to several state-of-the-art methods. In addition, the verification could be greatly improved by fusing orientation maps with different scales.

• 한국측량학회지
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• 제22권1호
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• pp.53-62
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• 2004

본 본문은 GPS(Global Positioning System)와 IMU(Inertial Measuring Unit)를 연계하여 최소의 지상기준점만으로도 재래식 항공사진측량 방법과 비교하여 정확도의 손실 없이 외부표정요소를 결정할 수 있는 새로운 기법에 대하여 연구하였다. 이러한 GPS/INS 항공사진측량의 실무적용 가능성을 입증하기 위하여 직접 비행실험을 하고 촬영된 대상지역에 대하여 동적 GPS 위치결정의 정확도의 검증 및 재래식 방법과 GPS/IMU에 의한 사진기 준점측량을 실시하여 다양한 방법으로 비교한 결과를 소개하였다.

• 한국안전학회지
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• 제13권2호
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• pp.30-38
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• 1998

In this study, in order to measure energy-absorbing characteristics in impact test of CFRP thin-walled laminates and interpret the cause of decreasing age when collapse test is carried out under the environments of high temperatures and hygrothermals, the moisture absorbing behavior according to the variety of orientation angle is observed and impact collapse characteristics of no moisture absorbing status is compared with that under the environments of high temperatures and hygrothermals. Especially, we try to obtain quantitative design data to develop CFRP thin-walled laminates with energy characteristics of optimum impact absorbing. The value of the maximum loading, mean loading, rate of energy absorption energy per unit volume and mass in CFRP thin-walled laminates on the high temperatures and hygrothermals is measured much lower than under no moisture absorbing. The maximum collapse loading in dynamic impact test is taken measurements lower than in static collapse test CFRP circular laminates in high temperatures and hygrothermals. But the absorbed energy per unit mass and volume is almost same each other and the biggest amount of energy is shown in CFRP circular laminates with orientation angle of $15^{\circ}$. Therefore, in the case of using CFRP circular laminates with axisymmetric mode, CFRP thin-walled structural members with orientation angle of $10^{\circ}$, $15^{\circ}$ has generally best condition.

• 센서학회지
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• 제9권5호
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• pp.373-379
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• 2000

본 논문에서는 차량이 자동으로 도로를 추적하는 자율주행을 실현하기 위한 선행조건으로서 자기차선의 자장으로부터 차량의 위치와 방향을 추정하기 위한 시스템을 제안한다. 자기차선에 사용되는 원통형 영구자석인 단일자기원에 자기 쌍극자 모델이 적용될 수 있음을 검증하기 위해서 자기센서를 이용하여 위치에 따른 원형 영구자석 자장의 3축 성분을 측정하고 실험 데이터를 자기 쌍극자 모델과 비교하였다. 실험 데이터를 기반으로 한 모델을 이용하여 자장의 3축 성분에 의하여 센서의 위치를 추정할 수 있음을 보인다. 단일 자기원에 검증된 자기 쌍극자 모델을 자기차선으로 확장하고, 센서의 위치와 방향에 따른 자장의 3축 성분의 실험 데이터를 획득한다. 실험 데이터의 맵핑을 이용하여 자장의 3축 성분에 따른 센서의 위치와 방향을 추정한다. 자기차선 상에서 차량의 위치와 센서를 제안된 방법에 의해 추정하고 컴퓨터 시뮬레이션을 통하여 차선추적에 적용한다.

• 한국주거학회논문집
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• 제12권2호
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• pp.45-54
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• 2001

The purpose of this research was to analyze the correlation between the Apartment Purchase Price Decision Factor and Amenity decision Factor with cognition of the Consumer. The result are as follows; 1. The correlation coefficient between the Apartment Price Decision Factor and Amenity decision Factor with cognition of the Consumer was 0.587. 2. The ranking of the purchase price factor which it prefers were analyzed orientation > sunlight > view > the rising price expectation > natural environment etc. And the ranking of the amenity were analyzed orientation > natural environment > view > sunlight > noise etc. 3. Consumer group was classified the location, sex, year of ages and unit scale. The rank correlation coefficient of (the significant was below 0.05) sex was 0.617~0.644, year of ages was 0.62~0.771 and unit scale was 0.762~0.852. This research proved the fact that the amenity correlated with the apartment purchase price decision factor, so amenity contained an economic value. And this result will be used in decision-making-process of apartment construction.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.894-900
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• 2005

A new approach to the straightforward implementation of the unscented filter in a unit quaternion space is proposed for spacecraft attitude estimation. Since the unscented filter is formulated in a vector space and the unit quaternions do not belong to a vector space but lie on a nonlinear manifold, the weighted sum of quaternion samples does not produce a unit quaternion estimate. To overcome this difficulty, a method of weighted mean computation for quaternions is derived in rotational space, leading to a quaternion with unit norm. A quaternion multiplication is used for predicted covariance computation and quaternion update, which makes a quaternion in a filter lie in the unit quaternion space. Since the quaternion process noise increases the uncertainty in attitude orientation, modeling it either as the vector part of a quaternion or as a rotation vector is considered. Simulation results illustrate that the proposed approach successfully estimates spacecraft attitude for large initial errors and high tip-off rates, and modeling the quaternion process noise as a rotation vector is more optimal than handling it as the vector part of a quaternion.