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DongJoonKim,DongIkKim,Seung-KooLee,SiYeonKim 대한영상의학회 2003 Korean Journal of Radiology Vol.4 No.3
Objective: To evaluate the efficacy of endosaccular Guglielmi detachable coil (GDC) treatment of unruptured aneurysms causing cranial nerve (CN) symptoms. Materials and Methods: Among a database of 218 patients whose aneurysms were treated using GDC, seven patients met the criteria for unruptured aneurysms presenting with symptoms and signs of CN palsy. Changes in CN symptoms before and after GDC treatment were reviewed. Results: Aneurysms were located in the internal carotid-posterior communicating artery (n=3), the basilar bifurcation (n=1) and the cavernous internal carotid artery (n=3). CN symptoms included ptosis (n=6), mydriasis (n=2), and extraocular muscle (EOM) disorder (CN III: n=4; CN VI: n=3). Overall, improvement or resolution of CN symptoms after treatment was noted in five patients. CN symptoms in cases involving small ( 10 mm) and intradural aneurysms tended to respond better to GDC treatment. Ptosis was the initial symptom to show improvement, while EOM dysfunction responded least favourably. Conclusion: GDC coil packing appears to be an appropriate treatment method for the relief of CN symptoms associated with intracranial aneurysms.
Effects of Pressure and NH3 Flow on Two-Dimensional Electron Mobility in AlGaN/GaN Heterostructures
Dong-Joon KIM,Seong-Ju PARK,노도영,Min-Su YI,Yong-Tae MOON 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
The dependence of the two-dimensional electron gas mobility in AlGaN/GaN heterostructures on the growth conditions of the AlGaN films grown by using metalorganic chemical-vapor deposition was investigated. X-ray re ectivity and X-ray diffraction measurements revealed that the growth pressure and the NH3 ow rate during the deposition of the AlGaN layer critically in uenced the interface roughness between the AlGaN and the GaN layers and the stacking order of the AlGaN layer in the growth direction. The Al0:15Ga0:85N/GaN heterostructure grown at a low pressure and a high NH3 ow rate showed an abrupt interface and an enhanced stacking order in the film, resulting in an increase in the two-dimensional electron gas mobility up to 1340 cm2/Vs at room temperature and 5200 cm2/Vs at 130 K. The dependence of the two-dimensional electron gas mobility in AlGaN/GaN heterostructures on the growth conditions of the AlGaN films grown by using metalorganic chemical-vapor deposition was investigated. X-ray re ectivity and X-ray diffraction measurements revealed that the growth pressure and the NH3 ow rate during the deposition of the AlGaN layer critically in uenced the interface roughness between the AlGaN and the GaN layers and the stacking order of the AlGaN layer in the growth direction. The Al0:15Ga0:85N/GaN heterostructure grown at a low pressure and a high NH3 ow rate showed an abrupt interface and an enhanced stacking order in the film, resulting in an increase in the two-dimensional electron gas mobility up to 1340 cm2/Vs at room temperature and 5200 cm2/Vs at 130 K.
A New Simplified Doubly Fed Induction Generator Model for Transient Stability Studies
Dong-Joon Kim,Young-Hwan Moon,Hae-Kon Nam IEEE 2015 IEEE transactions on energy conversion Vol.30 No.3
<P>This paper proposes a new simplified model of a doubly fed induction generator (DFIG) that is integrated with a rotor-side converter for studies of large-scale transient stability. This model accurately considers the rotor field dynamics of an induction generator to yield simulation results that are more accurate in terms of voltage stability, as well as angle stability. The purpose of this paper is to provide a simple but effective DFIG model for the study of large-scale transient stability, and to examine the important aspects of rotor voltage and rotor slip power. This new simplified DFIG model with an electric/turbine control system was tested against a six-machine and 23-bus system, and the responses obtained in case studies of transient stability were compared with those of a PSS/E program. Finally, the proposed DFIG model was also validated by comparing the simulation results for a single-machine and infinite-bus system with those of PSCAD/EMTDC.</P>
Application of Digital Human Modeling for Design of Yacht
Dong-Joon Kim,Chan Gil Ko,Yujeong Lee,Seong Rok Chang 대한인간공학회 2013 大韓人間工學會誌 Vol.32 No.5
Objective: In this study, virtual reality was adopted to consider ergonomic factors in yacht design. Virtual human which is the same actual human was created in virtual environment using Digital Human Modeling which has been used in the manufacturing communities to design better workplaces and maximize the safety of workers. Background: During the past 40 years yachting has expanded from being, generally speaking, a minority sport - too expensive for the large majority of people - into a major recreational activity practiced by millions all over the world. Many new yacht designs have appeared and number of professional, as well as amateur designers has increased steadily. But they had not considered ergonomic factors in yacht design. Method: Worker"s posture, traffic line and workload had been analyzed in sailing yacht. After the caution level was evaluated, we pointed out clues which had high workload and interference. To reduce workload, we applied ergonomic principles for improving working conditions and environments in Digital Human Model. Results: We found the space problems and workload of postures. Conclusion: (1) Unnatural posture of crews was sustained. (2) Workload that occurs in the human body was overloaded. (3) Crew"s work space was very narrow. Application: This study will be applied the new ergonomic design of yacht.
Development of Stroke Pre-diagnosis Method by using IoE and ECG
( Dong Joon Kim ),( Heasol Kim ),( Sung Kyun Im ),( Subramaniyam Murali ),( Kyung-sun Lee ),( Seung Nam Min ),( Se Jin Park ) 한국감성과학회 2017 한국감성과학회 국제학술대회(ICES) Vol.2017 No.-
In Korea, stroke is a very early mortality disease, and preliminary studies have been actively conducted to identify the cause of death and prevent. Among them, research is being conducted in various fields to determine the stroke by measuring vital signs. In a previous study, electrocardiogram (ECG) is a useful parameter for the diagnosis of stroke. Therefore, the purpose of this study is to propose a methodology for determining stroke through comparison of ECG R-R interval in 30 healthy and 20 stroke patients. For this purpose, electrocardiogram data for 30 healthy people were measured and electrocardiogram data for 20 stroke patients were collected through previous studies. The standard deviation of R-R interval was calculated and compared with the standard deviation of R-R interval at 5-minute interval for 24 hours. The average of R-R interval in stroke patients group was 35.3 ± 18.9 ms (Kim et al., 2005), and the average of R-R interval in healthy group was 62.1 ± 8 ms. The difference between stroke patients and normal subjects was significant. Based on these results, we developed a self-stroke pre-diagnosis device with electrode patch on the left chest area in using a Bayes’ theorem. If the electrocardiogram was within the range of 35.3 ± 18.9ms, it was recommended to the hospital as a stroke patient and 62.1 ± 8ms. The device is designed that if measured value is between the stroke patient R-R interval range, a warning sign is displayed. If we analyze the frequency of the electrocardiogram data and the P, Q, R, S, T waves, we will be able to make more precise stroke pre-diagnosis device.