수치해석을 이용한 흙막이벽체의 사보강버팀보에 적용하는 축강성에 대한 현장 적용성 연구

이영진,이성규,이강일,Lee, Yeong-Jin,Lee, Soung-Kyu,Lee, Kang-Il 한국지반신소재학회 2022 한국지반신소재학회 논문집 Vol.21 No.2

Unlike the horizontal strut, the corner strut causes bending behavior by the installation angle when soil pressure occurs, so there is a limit to its application as a elasto plastic method that requires only the axial stiffness of struts. Therefore, this study attempted to approach a method of modifying axial stiffness data to present an analysis method for corner struts in elasto plastic method, and linear elasticity analysis was used for this. And, through Linear elasticity analysis, axial stiffness data for corner struts installed at the actual site were calculated. The behavior of the retainingwall was confirmed by applying the calculated axial stiffness data of corner struts to elasto plastic method, and its applicability was evaluated by comparing it with the measurement results and the finite element analysis results. As a result of the study, when the axial stiffness data of the corner struts was applied using Linear elasticity analysis(Case 1, Case 3), the axial stiffness data decreased to 9% to 17% compared to the general method of applying the axial stiffness of the struts(Case 2, Case 4), and the displacement of the retainingwall increased to 25.33% to 64.42%. Comparing this result with the measurement results, when Linear elasticity analysis was used(Case 1, Case 3), the behavior of the retainingwall during the elasto plastic method was better shown.

MRAC 기법을 이용한 무인 컨테이너 운송차량의 조향 제어

이영진,허남,최재영,이권순,이만형,Lee, Y.J.,Huh, N.,Choi, J.Y.,Lee, K.S.,Lee, M.H. 한국항해항만학회 2000 韓國港灣學會誌 Vol.14 No.3

T his paper presents the lateral and longitudinal control algorithm for the driving of a 4WS AGV(Automated Guided Vehicle). The control law to the lateral and longitudinal control of the AGV includes adaptive agin tuning ability, that is the controller gain of the gravity compensated PD controller can be changed on a real-time. The gain tuning law is derived from the Lyapunov direct method using the output error of the reference model and the actual model, And to show the performance of the presented lateral and longitudinal control algorithm, we simulate toe nonlinear AGV equations of the motion by deriving the Newton-Euler Method, The read path is from quay yard area to docking position in loading yard area. The quay yard area is where the quay crane loads the container to the AGV and the docking position is where the container is transferred to the gantry crane. The road types are constructed in a straight line and J-turn. When driving the straight line, the driving velocity is 6㎧ and the J-turn is 3㎧.

세포성 면역 알고리즘을 이용한 AGV의 조향 제어기 설계에 관한 연구

이영진,이진우,이권순,Lee, Yeong-Jin,Lee, Jin-U,Lee, Gwon-Sun 제어로봇시스템학회 2001 제어·로봇·시스템학회 논문지 Vol.7 No.10

The PID controller has been widely applied to the most control systems because of its simple structure and east designing. One of the important points to design the PID control system is to tune the approximate control parameters for the given target system. To find the PID parameters using Ziegler Nichols(ZN) method needs a lot of experience and experiments to ensure the optimal performance. In this paper, CMIA(Cell Mediated Immune Algorithm) controller is proposed to drive the autonomous guided vehicle (AGV) more effectively. The proposed controller is based on specific immune responses of the biological immune system which is the cell mediated immunity. To verify the performance of the proposed CMIA controller, some experiments for the control of steering and speed of that AGV are performed. The tracking error of the AGV is mainly investigated for this purpose. As a result, the capability of realization and reliableness are proved by comparing the response characteristics of the proposed CMIA controllers with those of the conventional PID and NNPID(Neural Network PID) controller.

정적 자기장이 무순(radish sprouts)의 초기 발아와 성장에 미치는 영향

이영진,임지훈,박동국,Lee, Young-Jin,Lim, Ji-Hun,Park, Dong-Kook 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.1

심각한 기후변화로 인한 농업의 생산성 약화에 대비하기 위해 식물 성장을 촉진할 수 있는 방안에 대한 연구가 요구되고 있다. 식물성장을 촉진하는 방법으로 자기장을 이용하는 방법이 소개되고 있지만, 식물에 자기장을 인가하는 효과적인 방법에 대해서는 아직까지 자세히 연구된 문헌이 없다. 본 논문에서는 인가하는 정적 자기장의 세기, 자기장의 인가 방향, 자기장 노출 시간 변화에 따른 무순(radish sprouts)의 성장과 초기발아 효과에 대해 실험을 하고. 효과적인 자기장 노출 방법에 대해 조사하였다. 실험의 결과를 종합하면 자기장에 노출되지 않은 무순 보다 자기장에 노출된 무순의 초기발아가 약 3~4일정도 빠른 것으로 나타났고, 효율적인 무순의 성장을 위해서는 자기장의 세기를 적절히 선택해야 함을 알 수 있었고, 자기장의 인가 방향에 따라서는 큰 영향을 받지 않는 것을 알 수 있었다. In order to prepare for weakening of the productivity of agriculture due to serious climate change, the researches on promoting the growth of plant are required. Although the method of using magnetic field for improving the growth of plant was introduced, the effective method of imposing the field on the plant have yet to be studied thoroughly in the literatures. In this paper, we investigated the effects of static magnetic field on the growth and the early seed germination of radish sprouts according to the strength, direction of excitation and the expose time of the magnetic field, and present the effective method of imposing magnetic fields. From the measurements, it was found that the radish sprouts exposed in the field shows a rapid germination of about 3~4 days than those which had no field, and in order to the effective growth, the strength of the magnetic field should be properly selected, and the excitation direction of magnetic field has little effect on the radish sprouts growth.

GPS위성의 P코드/위상측정용 2주파수 수신기에 의한 정밀측위

이영진,Lee, Young Jin 대한토목학회 1993 대한토목학회논문집 Vol.13 No.2

지구측위시스템(GPS)은 1980년대 측량분야에서 가장 중요한 기술발전이며 최근에는 수신기의 개선과 데이터 처리기법의 발전에 따라 높은 정확도로서 효율적인 GPS측량이 가능하게 되었다. 이 논문에서는 데이터 선형조합의 방법에 대해 고찰하고 P코드/위상측정용 수신기인 Wild GPS System-200의 테스트 결과를 제시하고 있다. 연구결과는 7km/37km의 기선에서 1ppm 이내의 높은 정확도의 측정이 가능하며 P-코드 수신에 의한 1점측위에서는 10m의 위치정확도가 쉽게 얻어질 수 있으므로 초기좌표 결정에 효과적임을 보여주고 있다. The development of the Global Positioning System was one of the most significant technical advancements in the surveying fields during the 1980's. In recent years, the use of GPS techniques are increased because of the improvements of receiver design and the data analysis, and the greater accuracy. In this paper, the static positioning with special linear combinations of data is reviewed and some experiences of dual-frequency P-code/phase receivers are discussed. The test results of Wild GPS System-200 show that the highest accuracies of 1ppm are obtainable on baselines of 7km/37km and the positional accuracies of 10m, which is applicable to determination of initial coordinates, are also possible on point-positioning of P-code measurements.

우리나라 측량·공간정보관리에 관한 통합시스템 연구 - 새로운 국가공간정보기반(NSDI) 모델의 도입 -

이영진,Lee, Young-Jin 한국국토정보공사 공간정보연구원 2014 지적과 국토정보 Vol.44 No.1

본 연구에서는 "글로벌 공간정보관리" 전략에 대응하는 새로운 패러다임으로서 "측량 공간정보관리"를 위한 통합시스템을 연구하고 새로운 국가공간정보기반(NSDI)을 제시하는 데 목적이 있다. 이 논문에서는 우리나라의 기존 NGIS사업 및 공간정보정책을 검토하고 공공데이터 개방, 전자정부, 지구관측 등 국내외 흐름을 반영하여 대축척지도를 기반으로 하는 Bottom-up 방식으로서 NSDI의 정보영역을 수정하여 새롭게 정의하고[그림 1], 수치지도 등을 기본공간데이터와 동등한 개념으로 하여 공공-민간데이터의 공유데이터를 추가할 수 있게 하는 새로운 개념의 NSDI 모델을 제시하였다[그림 2]. 또한, 현재의 독립적인 국토교통정보화의 운영체계는 다른 부처의 응용분야(산림, 환경, 농업, 문화재 등)뿐만 아니라 국토교통부 내부인 다른 부문과의 협력체계를 강화하고 지방 중심으로 개선이 필요하다. 이에 새로운 개념의 NSDI를 국토교통부에 적용한 기관모델을 제안하고 있다[그림 3]. 새로운 국토교통부 SDI 기관모델에서는 공간정보 부문을 모든 활용 부문의 공통 기반으로 하고 데이터를 재편성하는 모델이며, 공통기반데이터를 통하여 소속기관 및 지방정부 데이터를 수직적 또는 수평적으로 연계하여 정부3.0이 가능하게 된다. 이러한 통합시스템은 국토지리정보원 기본도 데이터, 지방정부 KLIS 데이터, 지방정부 공공시설물 데이터를 모두 기본공간데이터 개념에 포함하게 되면, 현재 법령 또는 관리기관에 따라 독자적으로 운영되고 있는 모든 도면과 공부를 공통 기반(수치지도)과 통합, 연계하여 현행화할 수 있는 전략모델이다. In this study, it aims to research for unified system of "the surveying and geospatial information management" and new National geoSpatial Information Infrastructure(NSDI) as new paradigm against the strategy of "global geospatial information management". The country's existing NGIS projects and the policies of spatial information were examined in this paper, then it was defined newly by modification of NSDI's data coverage with bottom-up method. The new NSDI strategy is based on large scale digital map which was influenced by the local and global trend such as open data, e-Government, Earth observation, etc. (refer to Fig. 1). It was also suggested with new concept of NSDI model that the public-private sharing data can be added to digital map on equal term with spatial core data. (refer to Fig. 2) It is proposed the institutional model of MOLIT(Ministry of Land, Infrastructure and Transport) as new concept of NSDI which was applied(refer to Fig. 4). The new model is improving localization and reinforcing cooperation system with not only the other departments within the MOLIT but also the other ministries(forestry, environment, agriculture, heritage, etc.) from independent operation system as a part informatization of land, infrastructure and transport. At the new SDI institutional model of the MOLIT, the spatial information is reorganized as common data infrastructure for all applications, Goverment 3.0 can be feasible according to common data related to government agencies and local government's data vertically or horizontally. And then, it can be practical strategy model to integrate and link all the map and the register which are managed by the laws and institutions if this unified system as a common data can include all spatial core data(digital map), such as base map data of NGA(national gespatial agency), land data and facility data of local government.

수중 TCE 분해용 압전 초음파 트랜스듀서 개발

이영진,Lee, Youngjin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11

This paper describes the development of a piezoelectric flextensional transducer, which aims to effectively degrade the TCE contained in aqueous solution. In order to adjust the 1st flextensional resonant frequency and output displacement of the flextensional transducer, the effect of the geometrical variations on performance was analyzed using the finite element analysis (FEM). The results indicated that the effect of external shell's thickness and curvature were most significant, and experimental fabrication and characterization of a transducer was performed to confirm the results. To prove the capacity to degrade the TCE contained in aqueous solution, 50 and 100 ppm of TCE were prepared in sealed chamber, and investigated the removal rate of TCE through the time and initial concentration.

광견병 이야기

이영진,Lee, Yeong-Jin 대한수의사회 2013 대한수의사회지 Vol.49 No.4

습도에 따른 다이아몬드성 카본필름의 잔류응력 변화에 대한 연구

이영진,김태영,이광렬,양인상,Lee Young-Jin,Kim Tae-Young,Lee Kwang-Ryeol,Yang In-Sang 한국진공학회 2004 Applied Science and Convergence Technology Vol.13 No.4

라디오파 플라즈마 화학증착법 (radio frequency plasma assisted chemical vapor deposition: r.f.-PACVD) 법으로 증착된 다이아몬드성 카본 (Diamond-like Carbon : DLC) 필름에서 나타나는 습도에 따른 압축 잔류 응력의 변화 거동을 체계적으로 조사하였다. 합성에 사용된 탄화수소 가스의 종류와 -100V에서 -800V 범위의 기판 바이어스 전압의 조절을 통해 폴리머성 필름에서 흑연성 필름까지 광범위한 구조의 DLC 필름을 합성하였다. 상대습도가 10%-90% 범위에서 변화하는 분위기 챔버 내에서 박막의 잔류응력의 변화를 실시간으로 측정하였다 박막의 경도와 잔류응력이 최고 값을 가지는 합성조건에서 얻어진 치밀한 DLC박막에서는 습도에 따른 잔류응력의 변화가 관찰되지 않았다. 그러나, 폴리머상이나 흑연상의 박막에서는 두 경우 모두 습도가 높아짐에 따라 압축 잔류응력이 증가함을 관찰할 수 있었으며, 습도의 변화에 대해 잔류응력이 즉각적으로 변화하였다. 한편, 동일한 습도에서 압축 잔류응력의 증가량은 필름의 두께에 반비례하는 것이 관찰되었다. 이 결과는 물분자가 필름의 구조내로 침투하면서 생기는 변화가 아니라, 박막의 표면에서 일어나는 물분자와의 반응에 의해 필름의 잔류응력이 변할 수 있음을 의미한다. Dependence of residual compressive stress of diamond-like carbon (DLC) films on relative humidity was investigated. Polymeric, graphitic and diamond-like carbon films were prepared by r.f.-PACVD using methane or benzene with the negative self bias voltage of the substrate ranging from -100 to -800 V. In-situ measurements of the residual stress were carried out in an environment chamber where the relative humidity was varied from 10% to 90%. In dense DLC film of high residual compressive stress and hardness, we could not observe any change in the residual compressive stress with relative humidity. However, in the cases of graphitic and polymeric DLC films, abrupt change in the residual stress occurred by changing the relative humidity. The quantity of the stress change was inversely proportional to the film thickness, which means that the stress change with humidity is not due to the penetration of the water molecule into the film structure, but due to surface interaction between water molecules and film surface.

에어셀을 이용한 손목 재활훈련 장치

이영진,정유진,구교인,지영준,Lee, Youngjin,Jeong, Yujin,Koo, Kyo-In,Chee, Youngjoon 대한의용생체공학회 2015 의공학회지 Vol.36 No.2

In this paper, we propose a wrist rehabilitation training device using pneumatic inflation and deflation of air cells. By alternating inflation and deflation of upper and lower air cells, the device makes the flexional and extensional movement for wrist rehabilitation. With the angular displacement sensor, it measures the flexion-extension angle of the wrist during the training and the bending angle is used for the automatic control of the device. Using the sensor output, the regression equation was obtained to measure the bending angle of the wrist from a wrist rehabilitation training device. The measurement error of the device was evaluated by comparing the measurement output with the angle from the photograph. The measurement error of wrist bending angle between the sensor and photo was $3.2^{\circ}$ in average. With additional test and improvement, the pneumatic wrist rehabilitation training device might be used for rehabilitation training.