• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.1
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• pp.82-87
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• 2002

The attitude determination in LEO Satellite like KOMPSAT is one of the most important issues for Sun-Acquisition. Particularly, in KOMPSAT, the roll axis direction can be determined since the sun sensor gives the information on the Euler angle for pitch and yaw axes in Sun-Acquisition mode. In other words, it is the problem to determine the two unknown axes direction with one axis knowledge. This paper proposes a new effective method for attitude determination of general LEO satellites when one axis information is avilable and proves its usefulness throughout the simulation.

• Journal of The Korean Astronomical Society
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• v.43 no.3
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• pp.55-64
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• 2010

We investigate how plasma structures in the solar chromosphere and corona can extend to altitudes much above hydrostatic scale heights from the solar surface even under the force of gravity. Using a simple modified form of equation of motion in the vertical direction, we argue that there are two extreme ways of non-hydrostatic support: dynamical support and magnetic support. If the vertical acceleration is downward and its magnitude is a significant fraction of gravitational acceleration, non-hydrostatic support is dynamical in nature. Otherwise non-hydrostatic support is static, and magnetic support by horizontal magnetic fields is the only other possibility. We describe what kind of observations are needed in the clarification of the nature of non-hydrostatic support. Observations available so far seem to indicate that spicules in the quiet regions and dynamic fibrils in active regions are dynamically supported whereas the general chromosphere as well as prorninences is magnetically supported. Moreover, it appears that magnetic support is required for plasma in some coronal loops as well. We suspect that the identification of a coronal loop with a simple magnetic flux tube might be wrong in this regard.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.33-34
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• 2009

임베디드 시스템 제품의 생명주기가 짧아짐에 따라서 개발시간을 단축하기 위한 많은 방법들이 나타나고 시도되었다. 그런 방법 중 프로토타이핑 방법은 개발할 제품을 모형으로 만들어 봄으로써 요구사항단계와 설계단계에서 시간을 절약할 수 있게되어 전체 개발시간의 단축을 이끌어내었다. 본 논문에서는 H/W의 디바이스들을 S/W에서 선택하여 시스템을 완성시킬 수 있는 DDEPS를 제안하여 개발과 테스팅단계에서 시간을 절약하여 전체 개발시간의 단축이 됨을 보인다.

• Journal of Trauma and Injury
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• v.19 no.2
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• pp.105-112
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• 2006

Purpose: Many stresses produce reactive oxygen species and bring about mechanism of antioxidant reaction. Cytokine and a neurotransmitter through the cell membrane, as well as signal transduction through the cell membrane, are used for various pathological condition of the brain, such as neurodegenerative disease. There are several antioxidant enzymes in cells (superoxcide dismutase, glutathion peroxidasae, peroxiredoxin catalase, etc.) Methods: This study used single- or double-label immunohistochemical techniques to analyze mouse spinal neuron cells expressing Prx I and Prx III after acute mobilization stress. Results: Prx I was observed in dendritic cell of the gray matter of the spinal cord, and Prx III was observed in the cytoplasm of the GM of the spinal cord. Conclusion: The results of this study will help to explain differences of expression in the distributions of the peroxiredoxin enzymes of the spinal cord.

• Journal of the Society of Naval Architects of Korea
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• v.50 no.6
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• pp.429-435
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• 2013

Recently, to improve the safety and maneuverability at fairway around harbor the POD system has been equipped on a ship. And the interest about maneuvering characteristics of a cruise ship has been increasing. In this paper the mathematical model of maneuvering motion of a cruise ship with twin POD system in general speed and slow speed are presented. And the maneuvering coefficients of mathematical model are obtained from the captive model tests using CPMC(Computerized Planar Motion Carriage). Computer simulation using mathematical model in general speed and slow speed are carried out and compared with the results of free running model test with the same model ship. The differences between the mathematical models are compared and discussed. In this paper the mathematical models, the results of captive model test and simulation results are presented.

• Journal of muscle and joint health
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• v.26 no.3
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• pp.251-260
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• 2019

Purpose: The purpose of this study was to investigate the relationships between resilience, job satisfaction, and job stress among nurses working at general hospitals. Methods: This study was a descriptive study using a questionnaire. The resilience scale, satisfaction scale and job stress scale were used. The data from 194 infection control nurses, who work for below 3 years at general hospitals, were collected from March 2 to September 30, 2017. Data were analyzed using SPSS 22.0 Win program. Results: In this study, job stress showed significant negative correlations with resilience (r=-.14, p=.043) and job satisfaction (r=-.50, p<.001). However, there was a significant positive correlation with infection control experience (r=.32, p<.001). Also, the level of job requirement stress and job autonomy stress scored higher than other sub-dimension of job stress. Job satisfaction was the most significant predictor (β=-.43, p<.001) in job stress. Conclusion: The findings of this study suggest that systematic training courses and education programs for new infection control nurses should be developed to decrease nurses' job stress and increase their resilience. Holding this program can help reduce nursing job stress and help to adapt individuals to existing changes.

• Korean Journal of Occupational Health Nursing
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• v.29 no.1
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• pp.8-19
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• 2020

Purpose: To identify the importance and performance levels of health management duties, work-related and general attributes of health managers in medical institutions and analyze their impact on the performance of managing health-care related tasks. Methods: This research identified the performance levels of 150 health managers who have been executing industrial health-related duties for more than six months as nurses in medical institutions with more than 30 hospital beds. The variables which affect their performances were then analyzed. Results: The average importance of health care duties was 8.1 out of 10 and 5.5 for performance levels. Multi-regression analysis on the variables affecting performance levels of health managers in medical institutions showed that health managers exhibit higher numbers under the following conditions: over 300 full-time employees, more than 1 year but less than 3 years of experience, positions above section chief level, affiliation to the safety and health department, and high perception of duty importance. Conclusion: Improved cognizance of health manager importance should occur initially; then, health-care center setup, assigning of exclusive occupational health managers, and organizational efforts to improve the working environment in tandem with the provision of educational training programs to improve work quality are necessary.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.14 no.3
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• pp.323-330
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• 2007

Purpose: The purpose of this study was to assess the difference in knowledge and learning needs of the coronary artery disease according to the general characteristics of the patients with type 2 diabetes mellitus. Method: The participants were 188 patients who had diabetes mellitus. Data were obtained between January and April 2006 by asking the knowledge and learning needs of the coronary artery disease. Data were analyzed using SAS program. Results: Participants' knowledge level was high in the cause and prevention, but the level was low in the symptom and occurrence of pain. Learning need for "Influence of smoking on heart disease" and "The structure and functions of the heart" was great, but learning need for "Complete diagnosis" and "Management of pain and pressure on the sternum" was little. No significant differences were found in the knowledge level of the coronary artery disease according to the general characteristics. Learning needs were greater in participants under 60 years of age (p=0.011) and in those with low education level (p=0.049). There was a significant correlation between knowledge and learning needs of the coronary artery disease (p=0.003). Conclusion: In planing the education programs, the general characteristics of the patients should be considered.

• Journal of Information Processing Systems
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• v.6 no.2
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• pp.163-176
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• 2010

Nowadays due to the rapid advances in the field of information systems, transactional databases are being updated regularly and/or periodically. The knowledge discovered from these databases has to be maintained, and an incremental updating technique needs to be developed for maintaining the discovered association rules from these databases. The concept of Temporal Association Rules has been introduced to solve the problem of handling time series by including time expressions into association rules. In this paper we introduce a novel algorithm for Incremental Mining of General Temporal Association Rules (IMTAR) using an extended TFP-tree. The main benefits introduced by our algorithm are that it offers significant advantages in terms of storage and running time and it can handle the problem of mining general temporal association rules in incremental databases by building TFP-trees incrementally. It can be utilized and applied to real life application domains. We demonstrate our algorithm and its advantages in this paper.

• The Korean Journal of Cytopathology
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• v.15 no.2
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• pp.120-125
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• 2004

Ewing's sarcoma (ES)/PNET is common in both axial and appendicular skeletons, but is extremely rare in the talus. Here, we report a case of ES/PNET of the left talus in a 29-year-old male patient diagnosed by fine needle aspiration cytology, and review the literature on similar cases. The cytological smears were composed of individually dispersed small round cells and occasional clusters of loosely cohesive cells. The tumor cells were fragile, frequently exhibiting naked nuclei. Two distinct types of cells were observed. The light (chief) cells displayed round or slightly oval nuclei with frequent indentations, generally inconspicuous nucleoli, and a thin rim of cytoplasm, which sometimes harbored small vacuoles. The dark cells were smaller, displaying scanty cytoplasm with dense hyperchromatic nuclei, intermixed with chief cells, and often manifesting as small molded groups. However, no significant nuclear pleomorphisms or mitoses were noted. Tumor cells in the ceil block revealed positive cytoplasmic glycogen, as determined by a PAS stain with diastase control, and also exhibited positive immunoreactivity for CD99.