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한인우(In-Woo Han),황종명(Jong-Myung Hwang),한성익(Seong-Ik Han),이장명(Jangmyung Lee) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.1
This paper presents a new control algorithm for dynamic control of a unicycle robot. The unicycle robot motion consists of a pitch that is controlled by an in-wheel motor and a roll that is controlled by a reaction wheel pendulum. The unicycle robot doesn"t have any actuator for a yaw axis control, which makes the derivation of the dynamics relatively simple. The Euler-Lagrange equation is applied to derive the dynamic equations of the unicycle robot to implement the dynamic speed control of the unicycle robot. To achieve the real time speed control of the unicycle robot, the sliding mode control and LQ regulator are utilized to guarantee the stability while maintaining the desired speed tracking performance. In the roll controller, the sigmoid-function based sliding mode controller has been adopted to minimize the chattering by the switching function. The LQR controller has been implemented for the pitch control to drive the unicycle robot to follow the desired velocity trajectory in real time using the state variables of pitch angle, angular velocity, angle and angular velocity of the wheel. The control performance of the two control systems form a single dynamic model has been demonstrated by the real experiments.
한인우,김강민,강동일,이병철,Han, In-Woo,Kim, Kang-Min,Kang, Dong-Il,Lee, Byeong-Cheol 한국천문학회 2009 天文學論叢 Vol.24 No.1
We present a method to improve the RV (radial velocity) measurements accuracy by using telluric lines. Telluric lines are used to estimate the wavelength scale drift over the detector of the spectrograph. In the case of BOES, the Echelle spectrograph at BOAO (Bohyunsan Optical Astronomical Observatory), the wavelength scale drift can be several hundreds m/s over 24 hours. Due to the wavelength scale drift, the RV measurements accuracy of BOES is limited to several hundreds m/s. By estimating the wavelength scale drift by telluric lines, we can remove its effect to improve the RV measurements accuracy to about 40 m/s.
BOES 데이터를 이용한 정밀 시선 속도 추정 프로그램 RVI2CELL 개발
한인우,김강민,이병철,Han, In-Woo,Kim, Kang-Min,Lee, Byeong-Cheol,Valyavin, G. 한국천문학회 2007 天文學論叢 Vol.22 No.3
In this study we present basic principles and features of RVI2CELL, a precise RV (radial velocity) estimation program to process stellar spectra obtained through iodine cell. RVI2CELL is very robust and fast program. The instrument profile can be modeled as a sum of Gaussian functions or a non-parametric arbitrary shape. The RV accuracy estimated by observation of a RV standard star Tau Ceti indicates about 9 m/s.
국제천문 및 천체물리 올림피아드 현황과 기출문항에 대한 과학탐구 유형 분석
임인성,성현일,한인우,김유제,최승언,Yim, In-Sung,Sung, Hyun-Il,Han, In-Woo,Kim, Yoo-Jea,Choe, Seung-Urn 한국천문학회 2011 天文學論叢 Vol.26 No.3
The International Olympiad on Astronomy and Astrophysics (IOAA) initiated by the Thailand Astronomical Society in 2007 is an annual competition for high school students. One of its aim is to enhance the development of international exchange in the field of school education in astronomy and astrophysics. This paper first provides the overview of the IOAA in terms of key regulations based on its statutes, history and current status. Secondly, the published syllabus of the IOAA is used for content analysis according to subject areas regarding the exam questions of the IOAA in theoretical, observational and data analysis parts from 2007 to 2010. Also, a scientific inquiry framework is applied to the same questions for assessment based on scientific inquiry in the cognitive aspect with two sub-classes of scientific knowledge and scientific reasoning. Among a dozen astronomy subject areas listed on the syllabus, the theoretical part of the IOAA makes more frequent use of the Sun, the solar system, properties of stars, and concept of time. In content knowledge, a factor of scientific knowledge, the IOAA questions, especially in the theoretical part have a lesser degree in difficulty than the IAO (International Astronomy Olympiad) exam questions for the same period whose degree in difficulty is comparable to college level. With regard to scientific reasoning, the IOAA questions tend to involve convergent rather than divergent thinking. Lastly, in light of these findings, discussions are given on the outcome of Korean participation in the previous IOAAs and ways to help better in preparing Korean students for future astronomy Olympiads.
김강민,한인우,유계화,Kim, Kang-Min,Han, In-Woo,Plachinda, S.,Valyavin, G.,Yoo, Kye-Hwa 한국천문학회 2005 天文學論叢 Vol.20 No.1
We plan to install the polarimetric optics in the AGU(acqusition and guiding unit) of the 1.8 m telescope at the BOAO(Bohyunsan Optical Astronomy Observatory). With this, the spectropolarimetric observations with the resolution of 45,000 and 60,000 in 4,000 to $8,000{\AA}$ ange could be done by the BOES(BOao Echelle Spectrograph). If we use the precision radial velocity measurement capability of the BOES, the accuracy of the magnetic field intensity measurements with this new BOES stokesmeter will be much increased. We present here the design concept of the BOES stokesmeter. Some details on the optics, mechanical parts, fiber parts and the lab test procedures of this stokesmeter are explained.
윤은아 ( Eun-a Yoon ),이경훈 ( Kyoung Hoon Lee ),황강석 ( Kang Seok Hwang ),이형빈 ( Hyung Been Lee ),한인우 ( In Woo Han ),황두진 ( Doo-jin Hwang ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.1
Changes in target strength (TS) values of sandfish when sandfish was alive and dead were investigated using ex-situ at 120 kHz. TS values measured by tilt angles with .50∼+50 degrees showed ranges from .71.0 to .53.3 dB for live sandfish, .63.1~.46.3 dB for thawed sandfish, and .70.0~.50.4 dB after 24 hours from thawed, respectively. It was shown that while TS values were similar between the case of live and the case of after 24 hours from thawed, mean TS values were higher by approximately 5 dB in the case of immediate thawed sandfish. It was also seen that TS values were similar between the case of thawed sandfish and the case of after 21 hours from live. The results showed that TS values of live sandfish were different from those of frozen sandfish. It implies that when estimating TS of frozen fish, the influx of bubbles and changes of body should be considered.
김강민,이병철,한인우,윤태석,Kim, Kang-Min,Lee, Byeong-Chul,Han, In-Woo,Yoon, Tae-Seog 한국천문학회 2003 天文學論叢 Vol.18 No.1
We tested the characteristics of the newly made Long Slit Spectrograph (LSS) of the BOAO which replaced the Medium Dispersion Spectrograph (MDS) in the year of 2003. Performance test results on the spectrogram shift by gravity direction variation, slit illumination function, efficiency and the precision of the radial velocity measurements show the capabilities of the LSS are much improved in every respect comparing with those of the MDS.
강동일,박홍서,한인우,이병철,김강민,Kang, Dong-Il,Park, Hong-Suh,Han, In-Woo,Valyavin, G.,Lee, Byeong-Cheol,Kim, Kang-Min 한국천문학회 2005 天文學論叢 Vol.20 No.1
We developed a data reduction program (RX) to process BOES data automatically. It processes a whole set of data taken during one night automatically - preprocessing, extraction to one-dimensional spectra and wavelength calibration. The execution is very fast and the performance looks pretty good. We described the performance of this program, comparing its procedure with that of IRAF. RX does not have functions for continuum normalization yet. We will develop those functions in the next works.
강동일,박홍서,한인우,이병철,김강민,Kang, Dong-Ii,Park, Hong-Suh,Han, In-Woo,Valyavin, G.,Lee, Byeong-Cheol,Kim, Kang-Min 한국천문학회 2006 天文學論叢 Vol.21 No.2
We developed a new program for automatic continuum normalization of Echelle spectrographic data. Using this algorithm, we have determined spectral continuum of almost BOES data. The first advantage of this algorithm is that we can save much time for continuum determination and normalization. The second advantage is that the result of this algorithm is very reliable for almost spectral type of spectrum. But this algorithm cannot be applied directly to the spectrum which has very strong and broad emission lines, for example Wolf-Rayet type spectrum. We implanted this algorithm to the program which was developed in the previous study. And we introduced more upgraded BOES data reduction program. This program has more convenient graphical user interface environment, so users can easily reduce BOES data. Lastly, we presented the result of study on line profile variation of magnetic Ap/Bp stars analyzed using this program.
강동일,박홍서,한인우,김강민,Kang, Dong-Il,Park, Hong-Suh,Han, In-Woo,Kim, Kang-Min 한국천문학회 2007 天文學論叢 Vol.22 No.2
We present the result of radial velocity observation of a W UMa type binary star EX Leo. We observed the star on February 16, 2003, using Long-Slit spectrograph of BOAO(Bohyunsan Optical Astronomical Observatory). Since the spectral lines are broad due to its fast rotation, it is difficult to distinguish two radial velocities from cross correlation function. Instead of cross correlation function, we used broadening function to develop our own code which estimate the radial velocity of the broadened line spectra. With our own code, radial velocities of primary and secondary stars are derived simultaneously. From the radial velocity curve fit, we obtained $K_1=50.24{\pm}8.29km/s$ and $K_2=254.05{\pm}20.984km/s$ respectively.