• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.6
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• pp.558-564
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• 2008

This paper presents an approach to combine adaptive controller with feedback linearization, which extends the applicability of the adaptive controller to a wider class of systems. The adaptive controller guarantees the asymptotic tracking convergence and the transient performance of the tracking error. The feedback linearization transforms a nonlinear plant into a linear time invariant form. The asymptotic tracking convergence is shown by the use of Lyapunov stability analysis and Barbalat's lemma.

• The Journal of the Korea Contents Association
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• v.11 no.3
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• pp.318-326
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• 2011

With the increase of senior population, adults in their manhood and senescence with neurogenic defects also increase as well; thus, it is necessary to conduct foundational research on speech fluency to rehabilitate adults with neurogenic language disorders. Thereupon, this study analyzes the characteristics of speech fluency comparatively by age and sex with the subjects of normal adults in their 50's to 70's. According to the result of collecting language samples from total 90 adults, 30 (15 males, 15 females) in each age group of the 50's, 60's, and 70's and comparing the speech rate and disfluency frequency, first, adults in their 70's showed slower speech rate than those in their 50's or 60's. And those in their 50's, 60's, and 70's indicated no difference in their speech rate by sex. Second, there was no difference in normal disfluency and total disfluency among the adults in the 50's, 60's, and 70's. Also, there was no difference among the age groups by sex, either. Third, there was no correlation between speech rate of all the age groups and disfluency frequency.

• 프린팅코리아
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• s.1
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• pp.90-93
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• 2002

우리 나라 현대 인쇄역사를 이끈 인물을 꼽는다면 빼놓을 수 없는 사람이 있다. 바로 성도GL의 김남춘회장이다. 그는 인쇄와 인연을 맺은 후 40여년을 오로지 인쇄문화산업 발전에 헌신해 왔다. 김회장은 우리 나라가 고품질 인쇄를 실현하고 인쇄선진국으로 발돋움하기 위해서는 그에 걸맞는 기자재의 도입이 절실하다는 생각으로 초지일관하며 첨단인쇄장비 공급이라는 외길을 걸어왔다. 그래서 대부분의 인쇄인들이 우리 나라 인쇄문화 발전에 기여한 분으로 김회장을 꼽는데 주저하지 않는다. 올해 나이 70. 그는 지난 3월 아들인 김상래사장에게 경영전반을 맡기고 2선으로 물러났다. 이에 본지는 창간 특집으로 현대인쇄의 산증인인 김회장을 만나 그 동안의 소회와 앞으로의 계획 등을 들어본다.

• Communications of Mathematical Education
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• v.9
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• pp.257-266
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• 1999

창의성 신장을 위한 수학 영재 교육 개선 방안에 관한 연구의 일부로 고등학생을 대상으로 한 창의성을 기르는 문제를 개발하였다. 창의성의 요인을 중심으로 민감성 - 수학내용을 이용한 글쓰기, 유창성 - 1998 문제, 융통성 - 수 패턴, 독자성 - 테셀레이션, 재구성 능력 - 공간구성, 완성을 위한 노력 - 패턴구성하기의 6 가지 내용으로 구성하였다.

• Journal of Korea Multimedia Society
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• v.7 no.3
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• pp.319-326
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• 2004

In this paper, we propose color image segmentation by region merging method preserving the boundary of an object. The proposed method selects initial region by using quantized image's index map after vector quantizing an original image. After then, we merge regions by applying boundary restricted factor in order to consider the boundary of an object in HSI color space. Also we merge the regions in RGB color space for non-processed regions in HSI color space. And we reduce processing time by decreasing iterative process in region merging algorithm. Experimental results have demonstrated the superiority in region's segmentation results and processing time for various images.

• Aerospace Engineering and Technology
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• v.13 no.1
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• pp.1-9
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• 2014

Goheung aeronautical center is located in the area of Goheung of which land is reclaimed from sea and has a runway of length 700m, width 25m with test facility which has been used for flight test of UAV and small aircraft. To support the enhancement of aircraft safety, 1090ES ADS-B ground system as the ground surveillance system has been implemented. ADS-B system based on GPS and digital data link provides the function of enhancing the aircraft safety through flight information among aircrafts. This paper gives the result that the implementation of ADS-B ground system and the flight test with onboard ADS-B transmitter has been conducted.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.10
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• pp.46-52
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• 2004

A design methodology of the redundancy management for a duplex FBW flight control system is introduced. A statistical analysis is applied to determine two design parameters in CCM(Cross Channel Monitor), threshold and persistence count. An analytic redundancy, which is implemented using a Kalman filtering algorithm is considered. The application of an analytic redundancy to the FCS design of the smart UAV has several advantages of increasing the aircraft's survivability and breaking the tie-condition for a duplex FCS. All the redundancy management algorithms are verified through the numeric simulation for the flight dynamics of the XV-15 tilt rotor.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.10 no.1
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• pp.35-44
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• 2002

Inertial Navigation System(INS) has been used in the field of air navigation for a long time but is not popular in general aviation due to high price. Recently low-price GPS is available but vulnerable to radio interference. As an alternative on these problems, GPS/INS integrated navigation system has been considered. GPS/INS is capable of implementing navigation with low-price inertial sensors but its accuracy is dependent upon how much drift of INS may be calibrated by using GPS. In order to apply GPS/INS to air navigation, it must be investigated how long drift of INS in case of no GPS aiding will be bounded within requirements for safe flight. From the above motivation, the flight test for GPS/INS navigation system was conducted in order to make sense its performance in air navigation and its result was shown.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.6
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• pp.51-56
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• 2005

This paper introduces an altitude determination algorithm using GPS/INS/Baroaltimeter and evaluates the algorithm by real field tests. The test results show that the proposed method can determine the altitude of an aircraft continuously and sensitively. Therefore, it is appropriate to be used as an altimeter for a flight control system, especially for the automatic take-off and landing. In addition, it is shown that the second and the third baro-inertial vertical channel damping methods are essentially complementary filters while the proposed scheme improves these complementary filters.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.12
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• pp.54-60
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• 2005

In this paper, fault tolerant control for aircraft is being discussed. The authors propose a fault tolerant control algorithm based on time delay control. Time delay control is an effective method to deal with unknown dynamics. The proposed algorithm has no parameter to be updated and needs no prior information of faults. These are the primary advantages of the proposed method. The algorithm uses output feedback. The design and the stability condition are presented by following the existing proof. The proposed algorithms are verified by simulation examples.