• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.2
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• pp.17-25
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• 2004

In this Paper, new data matrix structure and respective processing algorithm for digital holographic storage are Proposed. Data matrix consists of user data and reference grid which is used to compensate geometrical errors such as magnification, shift and rotation of stored information. Processing algorithm identifies the location of reference grid and extracts user data. As a result of experiment, raw BER in case of shit, rotation and magnification are 3.09${\times}$10$^{-18}$ , 6.14${\times}$10$^{-12}$ , 1.2${\times}$10$^{-7}$ , respectively.

• Korean Journal of Applied Biomechanics
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• v.22 no.3
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• pp.277-284
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• 2012

The purpose of this study was to find out the changes in beginners' batting movements after taking undergraduate baseball lectures, by comparing and analyzing the speed of bat, the angle of body and its segments, the angular velocity and so on. For this purpose, the author picked up five undergraduates who had not taken baseball lectures, and conducted three-dimension computerized tomography twice on them, that is, before and after taking baseball classes, with eight infrared cameras and two force platforms. The conclusions are, first, the time required for swing was shortened after taking the classes. Second, the maximum velocity of the bat-end was increased. Third, at the time of impact, while the rotation angles of the pelvis and the tip of left foot were increased, the left elbow had more flexion after the classes. Fourth, the size of ground reaction force was increased at the point of swing where the ground reaction force of left foot became maximized. As we can infer from these conclusions, beginners' hitting movements before taking baseball classes tended to swing only with the arms, without waist rotation and weight shift of the lower body, but after the classes, their movements were proved to be corrected into the swing using the lower body. For the future studies, the author expects a research in a close to real environment by using pitching machine.

• Journal of Korean Academy of Nursing
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• v.5 no.1
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• pp.70-78
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• 1975

The investigators conducted this survey to find out prevalence of diseases and symptoms of the 812 nurses who were working at the 12 Seoul city and University's hospital in Seoul by retrospective study The results of survey were summarized as follows: 1. Distribution of Prevalence Rate of Diseases and Symptoms. 1) An average prevalence rate of diseases and Symptoms of the nurses/100 persons was 64.3 cases at Present October I.1972 2) The total number of diseases and Symptoms was 522 cases at present Oct, I 1972 for the survey nurses. The prevalence rate of following diseases/100 persons were as, foot sore-11, 3. myopia-9.7, neuralgia-9.6, anemia-9.1, insomnia-8.6 cases and the corrected number percent of prevalence rate of diseases and symptoms of the above diseases into 100 denominator were as follows : foot sore-17.6% , myopia-15.4%, neuralgia-14.9%, anemia-14.2% insomnia-13.2%. 3) The prevalence rate of diseases and symptoms/100 person for the age group of 45 and over was 140.0 cases and the age of 35-39 years was 27.3 cases. 4) The prevalence rate of diseases and symptoms/100 persons by the rotation system of nurses'duty/day were as follows: two shift system rotation-86.7 cases, three shift system rotation-67.9 cases and day duty only was 56.2 cases, 5) The prevalence rate of diseases and symptoms/100 person by the basic nursing education background seemed to be lower occurrence against to the higher education and it was 94.4 cases at the Technical Nursing High School graduates. 6) The prevalence rate of diseases and symptoms/100 persons by the marital status of the nurses were as follows; single-64.8 cases, married-48, 7 cases, and widowed-28.6 cases. II. Relationship Between working Experience and prevalence of the Disease and symptoms. 1) There were no relationship by statistical test between prevalence of eye disease and experience at the eye ward(p〉0.05), skin disease and experience at the dermatology ward (p〉0.05), foot sore and experience at the operating room (p〉0.05), varicose vein and experience at the operating room (p〉0.05), sore finger and experience at the central supply room (p〉0.05), infectious disease and experience at the isolation ward(p〉0.05). 2) There was significant relationship by statistical test between pulmonary tuberculosis and experience at the tuberculosis ward (p〉0.05) prevalence of pulmonary tuberculosis was five times in experienced group than non experienced group.

• Progress in Medical Physics
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• v.12 no.2
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• pp.177-184
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• 2001

The goal of radiation treatment is to deliver a prescribed radiation dose to the target volume accurately while minimizing dose to normal tissues. Due to inaccurate placement of field and shielding block and patient's movement, there could be displacement errors between the planed and treatment regions. In order to verify the location of radiation treatment, we in this study developed the registration algorithm of the x-ray simulator images and portal images and quantified the inaccuracy in terms of shift, scale and rotation. The algorithm for registration of pairs of radiation fields consists of the alignment of pairs of radiation images by points matching and field displacement analysis by field boundary matching. In the first step, paired surface landmarks are matched to calculate the transformation parameters (scale, rotation and shift) using the corresponding line pairs which are created by connecting two landmarks of each image. In the next step, portal field boundary is extracted and then the two field boundaries are matched by the $\rho$-$\theta$ technique. Applying the phantom portal images, detection errors were calculated to be less than 2mm in translation, 1$^{\circ}$ in rotation and 1% in scale. In conclusion, we quantitatively analyzed the displacement error of x-ray simulator images and portal images. The present results could contribute to the study of the radiation treatment verification.

• Korean Journal of Optics and Photonics
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• v.15 no.2
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• pp.100-103
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• 2004

A systematic method for tunable dispersion compensation based on chirped fiber Bragg gratings without a center wavelength shift is proposed. The specially designed mechanical rotator can flexibly control the chirping ratio along the fiber grating and the corresponding dispersion value. The group delay can be linearly controllable since the proposed method can induce a linear strain gradient with the rotation angle change. The dispersion value could be controlled from 228.04 ㎰/nm to 1430.7 ㎰/nm with small center wavelength shift, which was less than 0.03 nm.

• Journal of Korean Society for Geospatial Information Science
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• v.16 no.4
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• pp.11-16
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• 2008

The goal of this study is to evaluate the KLT(Kanade-Lucas-Tomasi) for extracting and tracking the features using various data acquired from UAV. Sequences of images were collected for Jangsu-Gun area to perform the analysis. Four data sets were subjected to extract and track the features using the parameters of the KLT. From the results of the experiment, more than 90 percent of the features extracted from the first frame could successfully track through the next frame when the shift between frames is small. But when the frame to frame motion is large in non-consecutive frames, KLT tracker is failed to track the corresponding points. Future research will be focused on feature tracking of sequence frames with large shift and rotation.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.21 no.4
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• pp.466-474
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• 2014

Purpose: The purpose of this study was to identify the relationship between emotional intelligence and stress coping of nurses in hospitals. Method: The study was a descriptive-correlational study with a convenience sample of 298 nurses. Descriptive statistics t-test, Mann-Whitney U, One-way ANOVA and Pearson correlation coefficients were used for data analysis. Results: The results of this study were as follows; Emotional intelligence was higher in married nurses than unmarried nurses (t=-2.90, p=.004). Nurses with a clinical career of 4~7 years had better stress coping than nurses with shorter careers (F=5.60, p=.004). Ward nurses better stress coping than nurses in emergency rooms and Intensive care units (F=4.43, p=.013). Fixed shift nurses had better stress coping than nurses on rotation shifts (t=-2.37, p=.019). There was a significant positive correlation between emotional intelligence and stress coping(r=.29, p<.001). Conclusion: The results indicate that stress coping is better in nurses with higher emotional intelligence, 4~7 year clinical experience, working on ward a as well as having a fixed shift. However further development and application of programs which can improve nurses' emotional intelligence are needed.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.1
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• pp.41-46
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• 2010

In this paper, the DoA(Direction of Arrival) estimator using unitary MUSIC algorithm is studied. The complex-valued correlation matrix of MUSIC algorithm is transformed to the real-valued one using unitary transform for easy implementation. The eigenvalue and eigenvector are obtained by the combined Jacobi-CORDIC algorithm. CORDIC algorithm can be implemented by only ADD and SHIFT operations and MUSIC spectrum computed by 256 point DFT algorithm. Results of unitary MUSIC algorithm designed by System Generator for FPGA implementation is entirely consistent with Matlab results. Its performance is evaluated through hardware co-simulation and resource estimation.

• Journal of the Korean Chemical Society
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• v.33 no.2
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• pp.149-155
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• 1989

1H-nmr chemical shifts and lineshapes of amino-protons of thioacetamide in n-alcohols were determined. The chemical shifts are discussed by the Reichardt's solvent polarity parameter, $E_T(30)$. The following relationship between ${delta}_{obs}\;and\;E_T(30)$ was obtained, ${\delta}_{obs}=a{\cdot}E_T(30)＋b{\cdot}(E_T(30))_2$ where a is a characteristic constant for the protons of thioacetamide in n-alcohol solutions and b is a constant for the solute(TA)-solvent (n-alcohols) interactions. The barrier of the hindered rotation about the N-C(S) bond in TA was obtained by analysis of the lineshape of the amino-protons in TA. The behavior of the hindered rotation as well as chemical shifts of the amino-protons in TA has been found to be closely related to the $E_T(30)$ of n-alcohols.

• Journal of Computational Design and Engineering
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• v.3 no.3
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• pp.198-214
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• 2016

Oval substrates are widely used in automobiles to reduce the exhaust emissions in Diesel oxidation Catalyst of CI engine. Because of constraints in space and packaging Oval substrate is preferred rather than round substrate. Obtaining the flow uniformity is very challenging in oval substrate comparing with round substrate. In this present work attempts are made to optimize the inlet cone design to achieve the optimal flow uniformity with the help of CATIA V5 which is 3D design tool and CFX which is 3D CFD tool. Initially length of inlet cone and mass flow rate of exhaust stream are analysed to understand the effects of flow uniformity and pressure drop. Then short straight cones and angled cones are designed. Angled cones have been designed by two methodologies. First methodology is rotating flow inlet plane along the substrate in shorter or longer axis. Second method is shifting the flow inlet plane along the longer axis. Large improvement in flow uniformity is observed when the flow inlet plane is shifted along the direction of longer axis by 10, 20 and 30 mm away from geometrical centre. When the inlet plane is rotated again based on 30 mm shifted geometry, significant improvement at rotation angle of $20^{\circ}$ is observed. The flow uniformity is optimum when second shift is performed based on second rotation. This present work shows that for an oval substrate flow, uniformity index can be optimized when inlet cone is angled by rotation of flow inlet plane along axis of substrate.