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정보기기들을 위한 리눅스 기반 연성 실시간 커널의 설계 및 평가 방법
정영준,임동혁,임채덕,최훈,Jung, YungJoon,Lim, Donghyouk,Lim, Chaedeok,Choi, Hoon 대한임베디드공학회 2011 대한임베디드공학회논문지 Vol.6 No.6
Recently, demands of information devices are increasing as we can find so many information devices around us such as smartphone, MID(Mobile Internet Device), Tablet. These characteristics of information devices services should support soft real-time based time guaranteed multimedia services and control internet appliances. In this situation, soft real-time supported system should be developed to consider as a total aspect of hardware, kernel, middleware, application. But this paper will describe soft real-time supporting and evaluation methods for information device as an aspect of only kernel.
디지털트윈 기술의 도시 정책 활용 사례 (세종시 도시행정 디지털트윈 프로젝트를 중심으로)
정영준,조일연,이정우,김범호,이성호,임창규,이천희,백의현,진기성,김영철,이상민,최민석,김태호,장민주,김산옥,김혜경,정승준,이선영,안주혁,Jung, Y.J.,Cho, I.Y.,Lee, J.W.,Kim, B.H.,Lee, S.H.,Lim, C.G.,Lee, C.H.,Paik, E.H.,Jin, K.S.,Kim, Y.C.,Lee, S.M.,Choi, M.S.,K 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.2
National and social issues are becoming increasingly common, but traditional policy-making methods are no longer effective. Therefore, evidence-based policy making is emerging as an alternative paradigm. Digital twin technology is one of the digital support tools for the new data-driven policy-making process. This study presents ongoing government experiments in the world where digital twin technology is applied to policy making and describes our experience in developing digital twin platforms in Sejong-the de facto administrative capital of South Korea.
로봇 사이버나이프에서 위치인식시스템을 이용한 Targeting Error값 보정의 정확성 평가
정영준,정재홍,임광채,조은주,Jeong, Young-Joon,Jung, Jae-Hong,Lim, Kwang-Chae,Cho, Eun-Ju 대한방사선치료학회 2009 대한방사선치료학회지 Vol.21 No.1
Purpose: The purpose is to evaluate the accuracy of correcting the targeting error through the Target Location System (TLS) for the location change error of the reference point which arises from the movement or motion of patient during the treatment using the CyberKnife. Materials and Methods: In this test, Gafchromic MD-55 film was inserted into the head and neck phantom to analyze the accuracy of the targeting, and then the 6 MV X-ray of CyberKnife (CyberKnife Robotic Radiosurgery System G4, Accuray, US) was irradiated. End to End (E2E) program was used to analyze the accuracy of targeting, which is provided by Accuray Corporation. To compute the error of the targeting, the test was carried out with the films that were irradiated 12 times by maintaining the distance within the rage of $0{\pm}0.2\;mm$ toward x, y, z from the reference point and maintaining the angle within the rage of $0{\pm}0.2^{\circ}$ toward roll, pitch, yaw, and then with the films which were irradiated 6 times by applying intentional movement. And the correlation in the average value of the reference film and the test film were analyzed through independent samples t-test. In addition, the consistency of dose distribution through gamma-index method (dose difference: 3%) was quantified, compared, and analyzed by varying the distance to agreement (DTA) to 1 mm, 1.5 mm, 2 mm, respectively. Results: E2E test result indicated that the average error of the reference film was 0.405 mm and the standard deviation was 0.069 mm. The average error of the test film was 0.413 mm with the standard deviation of 0.121 mm. The result of independent sampling t-test for both averages showed that the significant probability was P=0.836 (confidence level: 95%). Besides, by comparing the consistency of dose distribution of DTA through 1 mm, 1.5 mm, 2 mm, it was found that the average dose distribution of axial film was 95.04%, 97.56%, 98.13%, respectively in 3,314 locations of the reference film, consistent with the average dose distribution of sagittal film that was 95.47%, 97.68%, 98.47%, respectively. By comparing with the test film, it was found that the average dose distribution of axial film was 96.38%, 97.57%, 98.04%, respectively, at 3,323 locations, consistent with the average dose distribution of sagittal film which was 95.50%, 97.87%, 98.36%, respectively. Conclusion: Robotic CyberKnife traces and complements in real time the error in the location change of the reference point caused by the motion or movement of patient during the treatment and provides the accuracy with the consistency of over 95% dose distribution and the targeting error below 1 mm.
정영준,윤정호,김규용,Jeong, Young-June,Youn, Jung-Ho,Kim, Gyu-Yong 대한물리치료과학회 2008 대한물리치료과학회지 Vol.15 No.1
A decrease in the ability to maintain static and dynamic balance after stroke could be related to the inability to select reliable sensory information in producing relative motor action needed to maintain postural stability. The purpose of this study was to compare the effects of two different types of surface conditions on the balancing ability of subjects with stroke. Eighteen hemiparetic subjects were assigned to an experimental and control group participating in a six-week rehabilitative therapeutic exercise program focusing on balance and mobility. Exercises were performed 3 to 5 times per week in a stable surface condition by the control group, and in an unstable surface condition by the experimental group. Pre- and post test assessments involved the measurement of the static balance and dynamic balance, respectively by 7-item Berg Balance Scale-3P and by Pro-3 Balance System. Results showed that under the unstable surface condition, static balance in the experimental group showed more improvement than that of the control group.(Statistically, not very significant.) All the aspects of dynamic balance and mediolateral sway(balance) improved significantly than those of the control group. However, there were no significant differences between two groups. Overall, it can be concluded that under the unstable surface condition, the rehabilitative therapeutic exercise programs are effective in improving the dynamic balance of stroke subjects. The results suggest that the adaptation of the unstable surface in the rehabilitative therapeutic exercises could be effective for the patients with hemiplegia in balance. Further studies are needed to confirm the effectiveness of the unstable surface on improving balance and postural stability of hemiplegics.
혼합물설계법에 의한 Li<sub>2</sub>O-TeO<sub>2</sub>-ZnO 유리의 물성에 대한 조성의 가성성인자 분석
정영준,이규호,김태호,김영석,나영훈,류봉기,Jung, Young-Joon,Lee, Kyu-Ho,Kim, Tae-Ho,Kim, Young-Seok,Na, Young-Hoon,Ryu, Bong-Ki 한국재료학회 2008 한국재료학회지 Vol.18 No.11
In this study, the additivity factors of compositions to density and glass transition point ($T_g$) in a $xLi_2O-(1-x)[(1-y)TeO_2-yZnO]$ (0<x<20, 0<y<20) glass system were analyzed by using mixture design, and the change of ionic conductivity with density and $T_g$ was discussed. As a method for predicting the relation between glass structure and ionic conductivity, density was measured by the Archimedes method. The glass transition point was analyzed to predict the relation between ionic conductivity and the bonding energy between alkali ions and non-bridge oxygen (NBO). The relation equations showing the additivity factor of each composition to the two properties are as follows: Density(g/$cm^3$) = $2.441x_1\;+\;5.559x_2\;+\;4.863x_3\;T_g(^{\circ}C)$ = $319x_1\;+\;247x_2\;+\;609x_3\;-\;1950x_1x_3$ ($x_1$ : fraction of $Li_2O$, $x_2$ : fraction of $TeO_2$, $x_3$ : fraction of ZnO) The density decreased as $Li_2O$ content increased. This was attributed to change of the $TeO_2$ structure. From this structural result, the electric conductivity of the glass samples was predicted following the ionic conduction mechanism. Finally, it is expected that electric conductivity will increase as the activation energy for ion movement decreases.
(60-x)SiO<sub>2</sub>-40Na<sub>2</sub>O-xCaO(x=0∼15wt%)조성유리계의 조성, 온도 및 전기전도도간의 상관특성
정영준,김영석,이규호,김태호,진현주,류봉기,Jung, Y.J.,Lee, K.H.,Kim, T.H.,Kim, Y.S.,Chin, H.J.,Ryu, B.K. 한국재료학회 2007 한국재료학회지 Vol.17 No.8
We report the electrical conductivity of the mixed alkali silicate glasses in the system (60-x)$SiO_2-40Na_2O-xCaO(x=0\sim15wt%)$ in the temperature range from $150^{\circ}C$ to $620^{\circ}C$. In the range from $150^{\circ}C$ to glass transition temperature$(T_g)$, the electrical conductivities of glass samples had a tendency to be proportion with temperature. The glasses of containing over 7.5wt% CaO showed lower conductivities than the glasses of containing 0 and 5wt% CaO because two kinds of alkali ions$(Na^+,\;Ca^{2+})$ were obstructed each other. On the other hand, in the range from $T_g$ to $620^{\circ}C$, the electrical conductivity of glasses($7.5{\leq}x{\leq}12.5$) was unstable and decreased in some region. From XRD results, the $Na_4Ca(SiO_3)_3$ phase were observed in these glasses. This means the alkali ions didn't behave as carrier, it seems that this caused the conductivities decrease. In case of glass of containing 15wt% CaO, any crystal phase were not observed. This means the alkali ions behaved as carrier, it consequently seems the conductivity increased.