이동 로봇의 자율 주행제어

석진환,오세봉,Nguyen Van-Quyet,한성현,박동준 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This paper achieves a research about remote control of robot based on voice recognition. Through real-time remote control and wireless network capabilities of an unmanned remote-control experiments and Home Security / exercise with an unmanned robot, remote control and voice recognition and voice transmission are possible to transmit on a PC using a microphone to control a robot to pinpoint of the source. Speech recognition can be controlled robot by using a remote control. In this research, speech recognition speed and direction of self-driving robot were controlled by a wireless remote control in order to verify the performance of mobile robot controller.

조직공학적 연골생성에 있어서 연골막의 필요성

오경석,김해진,이동준,정재호,최준혁 大韓成形外科學會 2001 Archives of Plastic Surgery Vol.28 No.4

전동공구 내구성 평가 실험장치 개발

박근석,변영철,강이석,강배희,이동욱,차원준 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

For the endurance test, it is necessary to test the portable electric tools under the same condition as the actual operation condition. It is also essential that the test equipment is convenient to fix the tool. Those are necessary to control the loaded torque and to acquire and analyze the test data with a computer. In this study, we have developed an endurance test equipment for portable electric tools, where a hydraulic control system with a proportional relief valve was applied to control the load for the test. The developed test equipment used an industrial hydraulic pump as a load supplier to ensure a firm endurance of the test equipment itself. The data acquisition system has been automated by composing with a personal computer and RS-232C communication nets. This test equipment reduced the manhour for the test and also improved the reliability of the tested data which were measured and graphed.

우리나라와 미국의 주당순이익 산출방식에 관한 비교연구

송동섭,오문석 聖潔大學校 社會科學硏究所 1997 社會科學硏究 Vol.4 No.1

ABSTRACTEarnings per share(EPS) is generally calculated in many ways according to the criteria of common stock or the degree of the dilutionization on it, which the way of calculating of EPS in various ways is generalized in such high-developed countries with the complex capital structure as advanced ones.The present study under these circumstances is to consider the meaning of EPS, the method and problems of its calculation centering on the subject of the APB Opinion No.15 in the U.S.A.And also I have proposed the better idea and the method of EPS calculations.

시간지연 제어기법을 이용한 유연한 로봇 팔의 위치 제어

김동기,강이석,신효필 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

A TDC(Time Delay Control) theory is applied to the the position control problems of flexible robot manipulators subjected to unknown dynamics and distrurbances. One link flexible manipulator system with tip mass is represented as a simple spring-mass-damper syseem and AC servo motor is used as the actuator. Based on the system model, the TDC is designed, and the PI-controller is also designed for comparison. The control performance of TDC is evaluated through a series of simulations and experiments. The simulational and wxperimental results show that the TDC is much robust than the PI-controller to the unknown dynamics and disturbances.

원자력현미경 측정정보를 이용한 미세접촉 현상 분석

안효석,장동영 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

In micro/nano-scale contacts in MEMS and NEMS, capillary and van der Waals forces generated around contacting micro-asperities significantly influence the performance of concerning device as they are related to adhesion and stiction of interacting surfaces, In this regard, it is of prime importance to accurately estimate the magnitude of surface forces so that an optimal solution for reducing friction and adhesion of micro/nano-surfaces may be obtained. We introduce an effective method to calculate these surface forces based on topography information obtained from an atomic force microscope

아침결식이 여고생의 체력과 신체조성에 미치는 영향

이동옥,김현숙,송애경 建國大學校 敎育硏究所 2003 論文集 Vol.27 No.-

This study was intended to make a comparative analysis of the effect of female high school students' absence of breakfast on the composition of physical strength and body. This study was conducted for 30 subjects in the group of female high school students omitting breakfast, those female students enrolled in the high school attached to ´K´University. As the research method, this study made a measurement and comparison of body fat by group, conducted the physical strength test on six items and conducted the questionnaire research and analyzed its results. As a result, it was found that there was not a overall significant difference in body fat, physical strength and that breakfast did not have an effect on body composition and scholastic achievement as well. This run counter to the findings of previous studies and expectation of this study. Accordingly, it is necessary to male a systematic study of the effect of female high school students' absence of breakfast on the composition of physical strength and body for more subjects for a longer period of research.

새로운 螺幹碍子의 特性開發에 關한 硏究

金東弼,金元燮,金斗錫 全北大學校 1981 論文集 Vol.23 No.-

Recent increase in power supply capacity modernization and rationalization of high voltage distribution lines in korea requires electrically and mechanically more reliable insulators. The electical porcelain which has made today's EHV power transmission possible must be highly reliable in its mechanical strength as well as in electrical properties. Many studies have been made in search for a better porcelain that meets the requirements. This report portrays and compares various aspects and characteristics of electrical porcelains such as Conventional Porcelain, Alumina Porcelain and Cristobalite Porcelain in terms of their characteristics and applications. Also explained are the studies made on compression glaze, internal stress, size effect and electrical properties. Spiral rod line post insulators have been developed out of these needs and they have already demonstrated excellent performances in service. The outstanding features of these insulators are as follows. 1) As alumina porcelain is used, mechanical strength and power are resistibillity are excellent. 2) They are free from deterioration and puncture because of the solid core construction, virtually maintenance-free. 3) The insulation level is 1.5 times that of the existing pin type insulators. This strengthened insulation level is effective for preventing lightning flashover of the insulator and therefore it is also effective to protect insulated conductor from power arc melting breakage. 4) They show superior characteristics under heavy pollution conditions due to the antipollution design of insulator profile.

外國人 直接投資에 대한 硏究 : 對外經濟證屬이 經濟成長과 所得分配에 미치는 影響에 관한 實증硏究

徐東錫,金洙槿,宋燮瑋,金喆煥 亞洲大學校 1985 論文集 Vol.8 No.-

Dependency theory claims that economic dependency retards economic development and increases income inequlity within peripheral countries. On the other hand, neoclassical development theory predicts that economic linkage to the world economy facilitates economic growth and improves the income distribution. This paper aimes to test the general validity of dependency theory by using a cross section data over 1970s and time series data over the period 1962-1984 of Korea. The time series data allow us to observe the dynamics of dependency theory which emphasizes the "historical process". Four measures of economic dependency or external linkage are used to regress the economic growth rate and Gini coefficients. The control variables additionally employed in our empirical analysis are exports and domestic capital formation. The research design employed is a regression analysis incorporating lag structure. The results indicate that economic dependency has no significant negative effects on growth and income distribution. Thus we conclude that the denpendency theory is not substantiated by our empirical data. The data rather supports the neoclassical development theory.

한국인에게서 그레이브스병 약물치료의 적정기간

이형숙,이동훈,정희선,이종우,김정은,신승수,정윤석,이관우,김현만 대한내분비학회 2003 Endocrinology and metabolism Vol.18 No.1

연구배경: 그레이브스병의 치료에는 항갑상선제, 수술 및 방사성 요오드법이 선택되어 사용되고 있다. 이중 항갑상선제는 가장 많이 선호되고 있으나 낮은 관해율과 높은 재발율로 장기간 치료기간이 요구된다. 저자들은 그레이브스병 환자에게서, 선택되는 치료법의 선호도와 각 치료법의 관해율을 조사하고자 본 연구를 시행하였다. 또한 본 연구에서는 항갑선제 치료의 적정기간을 평가하고자 하였다. 방법: 아주대학교병원에 내원한 환자 중 1년 이상 추적관찰이 가능한 205명의 그레이브스병 환자를 대상으로 조사하였다. 항갑상제군, 수술군 및 방사성 요오드군은 각각 170명, 29명 그리고 6명이었다. ROC curve를 이용하여 약물치료의 예후예측인자를 분석하였다. 결과: 1) 그레이브스병 환자의 치료 방법의 선택은 항갑상선제군, 수술군 및 방사성 요오드군 각각 170명(83.0%), 29명(14.1%) 그리고 6명(2.9%)으로 항갑상선제 치료가 가장 선호되었다. 2) 그레이브스병의 관해율은 항갑상선제군, 수술군 및 방사성 요오드군에서 각각 60.0%(102/170명), 96.5%(28/29명) 그리고 83.0%(5/6명)으로 수술군이 가장 높았다. 3) ROC curve의 AUC는 치료기간과 진단시 TBII가 각각 0.709 및 0.648이었고 적절한 약물투여 추적 관찰기간은 26개월이었다. 결론: 그레이브스병의 일차 치료법으로는 항갑상선제가 선호되고 있으나 수술 및 방사성 요오드 치료군에 비해 상대적으로 낮은 관해율을 보였다. 따라서 항갑상선제 치료로 26개월 이상 관해가 되지 않을 경우에는 치료 방법의 변경을 고려하는 것이 관해율을 높이는데 도움이 될 것으로 생각된다. Background: Graves' disease in an organ specific autoimmune disease. Three kinds of therapeutic modalities (antithyroid drugs, ablation with radioactive iodine and subtotal thyroidectomy) are frequently performed for the management of this disease. The most popular therapeutic policy for the disease in Korea is antithyroid treatment. We analysed and compared the remission rates of all three modalities for Graves' disease, and evaluated the antithyroid modality to determine the correct duration of treatment. Subjects & Methods : The medical records of 205 patients with Graves' disease were reviewed. For the evaluation of the antithyroid modality medical treatment, antithyroid drugs were administered for more than 1 year. The prognostic factors associated with remission were analysed by means of an ROC curve. Results: 1) Of the 205 patients, proportions that received medical therapy, subtotal thyroidectomy and radioiodine therapy were 83.0, 14.1 and 2.9%, respectively. 2) The remission rates of the medical therapy, surgery and radioiodine therapy were 60.0, 96.5 and 83.0%, respectively. 3) The remission rate of the medical therapy was associated with the duration of medication and TBII activity. The determined proper duration for the antithyroid treatment was 26 months from the ROC curve analysis. Conclusion: The above results suggest that the proper duration of antithyroid treatment for Graves' disease is 26 months, after which time the subtotal thyroidectomy or radioiodine therapy should be considered if the disease has not remitted (J Kor Soc Endocrinol 18:24∼31, 2003).