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A study of Experienced by Physical Education Teachers in a Specialized High School
서기원(Ki Won Seo),정구인(Koo In Jung) 한국체육교육학회 2013 한국체육교육학회지 Vol.18 No.1
The purpose of this study was to analyze the emotions that the physical education teachers of specialized high school experienced and how they expressed and controled their emotions. For achieving this purpose, the participants of this study were two physical education teachers in a specialized high school. The collected data had been conducted by the emotion journal and in-depth interview. The analysis of research had used the method, the constant comparative analysis, used in qualitative method. Consequently, first, the participants of this study showed that they frequently had experienced three(pride, hope, appreciation) positive emotions and six(guilty, anxiety, anger, embarrassment, humiliation, sadness) negative ones. Next, they showed their emotions which they had experienced in the form of ``expression`` and ``suppression`` according to the object and situation.
서기원(Ki-Won Seo),김정한(Jung-Han Kim),노형환(Hyoung-Hwan Roh),성영락(Yeong-Rak Seong),오하령(Ha-Ryoung Oh),박준석(Jun-Seok Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
This letter presents that a rectenna can utilize more stable wireless power by using a new design dual band/dual polarization microstrip patch antenna and 2 stage voltage multiplier at 2.4 ㎓ band and 3.1 ㎓ band. The proposed antenna is a new microstrip patch antenna design to make impedance matching possible by using slotted capacitive coupling between the patch and 50 Ω feed line on a ground plane. Its advantage is that the size of the rectenna can be reduced by using 50 Ω feed line on the ground plane, which can be used efficiently. The dual band/dual polarization microstrip patch antenna shows circular polarization at 2.4 ㎓ band and linear polarization at 3.1 ㎓ band. Under -10 ㏈ return loss, The dual band/dual polarization microstrip patch antenna obtains 340 ㎒ bandwidth as 2.23∼2.57 ㎓ and 375 ㎒ bandwidth as 2.95∼3.325 ㎓. Also, 2 Stage Voltage multiplier is possible to operate at 2.4 ㎓ band and 3.1 ㎓ band. The designed retenna can usually obtain wireless power at both 3.1 ㎓ band, and 2.4 ㎓ band applications such as Wi-Fi, Bluetooth, Wireless LAN, etc. So more stable wireless power can be utilized at the same time.
서기원(Seo Ki-Won),박주연(Park Ju-Yeon),이상남(Lee Sang-Nam),류희문(Ryu Hee-Moon),변윤섭(Byun Yeun-Sub) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
This paper presents a method for precisely localizing and parking of bimodal trams. In order to gain an automatically driving system for bimodal trams, precise up-to-date localization, velocity recognition, distance to next station and precise parking location estimation functions are required. This paper proposes a system consisting of control device, steering device, sensor input equipment, driving system, tachometer, vehicle-side sensors, magnetic markers and magnetic sensors. The tram recognizes the precise location via magnetic markers containing information. Parking position and precise distance calculation is embodied by a tachometer. The vehicle-side sensors are used to assure safe station approaching and parking magnetic markers provide improvement of precision while tram parking. This paper provides a system realizing localization and precise parking and afterwards the automatic drive test results are reported and analyzed.
서기원(Ki-Won Seo),노승엽(Seung-Yeop Noh),유태환(Tae-Hwan Yoo) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
This paper proposes a Marconi antenna has 80~90 degree beam pattern for Vehicle-to-Vehicle communication. The antenna consists of a signal pattern and three or more Ground patterns and it makes the beam pattern in the direction of 80 to 90 degrees for Vehicle-to-Vehicle communication. The antenna also can make various beam pattern by adjusting the signal pattern and Ground pattern, so it can be applied various antenna beam-forming applications.
서기원(Ki Won Seo),강현재(Hyun Jae Kang),이충우(Choong Woo Lee),정정주(Chung Choo Chung) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper presents an effective method of precise velocity control at low speed with a low resolution encoder. Multirate observer to estimate the velocity at every DSP control period is used except a constant velocity mode. The observer corrects the estimation error when detects pulse signal. Unlike the conventional methods. the multirate estimator is stable at a low speed. However, the multirate estimator shows ripples at a constant velocity. Thus, in this paper we use a velocity prediction method which uses the present velocity from the previous average velocity to reject the ripple. In a summary, at a constant speed mode, the predicted velocity is used. Otherwise, the estimated velocity by the multirate obvserver is used. The effectiveness of the multirate observer and ripple rejection at low speed is verified through various simulations.