• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
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• pp.722-728
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• 2000

This study of field control machine in the recycled vinyl rail is gantry crane type and promoting agricultural automatization through self-controlled spraying, harvesting and conveyance. In addition to, that control machine could get a cost and labor reduction effect through automatization and make better environment by preventing farmers from agrichemical damage, accidents and recycling wasted vinyl. That machine is able to be divided as traveling, spraying, harvesting and conveyance sections. In driving section consists of girder frame, carrier, rail, control system, driving system, working machine, rail and loading device for working machine. This machine has following advantages to be able to bring a big innovation in the agricultural industry. I) Accurate performance is able to be done by proper positioning due to based on the rails. 2) The soil is not made hard like heavy tractor 3) The wheel is not sank into the soil and slipped well under rain like heavy tractor. Therefore, weather and soil situation could not affect working condition. 4) Complete unmanned control and 24hours-working are available due to traveling on the rails. 5) It could use various energy resources like not only liquid fuel but also solar, common electronic power due to traveling on the rails.

• 대한기계학회논문집A
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• 제38권5호
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• pp.567-573
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• 2014

최근에, 의학 분야의 MEMS 기술이 발전하면서 다양한 미세 유체 이송 시스템이 연구되고 있다. 본 논문에서는 기존의 펌프와는 다른, 두 개의 분리된 압전 판을 이용해 위장의 연동 운동을 모방한 마이크로 압전 펌프를 제안한다. 본 펌프는 진행파를 이용해 연동 운동을 일으켜 작동된다. 특히, 압전판에서 인가된 입력 전압에 의해 발생된 변위에 의해 동작된다. 이에 두 판 사이에서 진행파가 일어나며 유체는 진행파에 의해 생성된 압력차에 의해 이동된다. 압전 소자, 탄성체, 유체가 복합된 시스템을 이해하기 위해서 유한 요소 해석을 사용하였다. 챔버의 높이, 세라믹 개수 등의 설계 변수들을 변화시켜 유체의 유량을 확인하였다.

• 대한산업공학회지
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• 제14권2호
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• pp.53-61
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• 1988

Games such as baseball, soccer are scheduled by a given game type such as tournament, league or their mixed form. The objective of this paper is to find an efficient game-scheduling method with respect to traveling distance, break-time and other conditions. In this paper we first present two models which minimize traveling distance. The first model that a match is played once each other is solved by a heuristic method. In the second model that a match is played more than once, teams are paired by a modified 0 - 1 programming, and the pairs are rearranged in order to generate a number of workable schedules. Then Expert Systems is applied to solve breake-time and other conditions. In order to represent expertise's knowledge effectively, we present a new design of knowledge-base and data-base, inference engine including many rules and meta-rules which controls the global system. In knowledge-base, binary relation among various attributes is used to ease not only knowledge acquisition but also system execution.

• 정보처리학회논문지B
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• 제12B권7호
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• pp.823-828
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• 2005

개미 군락 시스템 (Ant Colony System, ACS)은 조합 최적화 문제 중의 하나인 방문 판매원 문제에(Traveling Salesman Problem TSP) 간단하게 응용할 수 있고 좋은 결과를 보여주었다. 그러나 ACS는 작은 TSP에서는 최적해를 구하였지만, 큰 TSP에 대해서는 최적해를 구하지 못하였다. 본 연구에서는 큰 TSP에 대한 최적해를 찾기 위하여 개미들에게 좀 더 많은 정보를 주는 기법의 하나로 한 도시에서 다음 도시로의 탐색 경로를 결정할 때, 인접한 도시들에(adjacent neighbor) 대한 거리로만 결정하지 않고 길이가 w인 부경로(subpath)에 대한 정보를 미리 수집한 후, 이 정보를 이용하여 경로를 생성하였다. 실험 결과 본 연구에서 제안한 기법이 기존의 ACS 기법보다 큰 그래프에서 최적해(Known Optimal)에 가까운 경로를 찾는 것을 볼 수 있다. 그래프에 따라서는 기존의 ACS 기법보다 최대 $70\%$ 이상의 성능이 개선되었으며 평균적으로 $30\%$ 내외의 개선된 결과를 보여준다.

• Journal of Biosystems Engineering
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• 제23권2호
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• pp.157-166
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• 1998

In this study. a traveling control system was developed to transfer a machine without an operator in the working zone. The dimension of the system was modelized to design and construct smaller than that of real configuration of a greenhouse. For this system, the fixed path type was used to detect exact position during operating a manless machine. and the X-Y table actuator type to escape a unique path, which had the disadvantage in a fixed path type environment. Based on the results of this research the following conclusions were made : 1. This system used two screws to move toward horizontal direction, and a Plate to reach at any points in the working zone. 2. The software combined the functions of path selection and motor operation to control into one program. The path selection program was a menu driven program written in Visual Basic, and the motor operation program was written in Borland C++ for actuating motors. 3. The path-select mode of the program was used by selecting the desired paths, and the user path-create mode by selecting a random path in the path-selection program. 4. The system proved to be a reliable system for operating a manless machine, since accuracy and precision to reach the positions were less than 1%.

• 전기학회논문지
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• 제56권7호
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• pp.1268-1274
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• 2007

A recently developed methods for the on-site calibration of the voltage transformer (VT) comparator system have been reviewed in the paper. The method utilizes the several traveling standards consisting of the VT, the non-reactive standard resistors, the wide ratio error VT, and the decade resistors. The VT is used for the absolute evaluation of a standard VT belonging to the industry. The non-reactive standard resistor and wide ratio error VT are used for the linearity check of errors in the voltage comparator of the industry. The decade resistors are used for evaluation of a VT burden of the industry.

• 한국항행학회논문지
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• 제8권1호
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• pp.38-47
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• 2004

레이다에서 도플러 측정과 MTI(Moving Targer Indicator), 고해상도 등의 기능을 수행하기 위해서는 송신 및 수신회로 전체가 코히어런트 시스템으로 동작하여야 한다. 본 논문에서는 코히어런트로 동작하는 레이다의 송수신단을 설계하기위해 TWTA(Traveling Wave Tube Amplifier)와 STALO(Stable Local Oscillator) 및 COHO(Coherent Oscillator)를 사용하였으며, 설계된 수신단에서의 잡음지수를 계산하였다. 계산된 잡음지수로 레이다 방적식을 이용하여 각 송신모드별로 최대 탐지 거리를 산출하였다.

• 농업과학연구
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• 제37권1호
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• pp.113-121
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• 2010

Land consolidation ratio for rice paddy fields reached to 64.7% as of 2008 in Korea, and this also accelerated automation of field machinery. Especially, research on autonomous tractors has been continuously conducted. Tillage is one of the labor-, energy-, and time-consuming field operations. Most important requirements for autonomous tractors would be travelling path planning and electronic system to control the tractor to follow the path. The instruction of computer was required to conduct the tillage operation in field with unmanned traveling tractor. This instruction was coincidently used in the control of the traveling path and the motion of tractor. The objectives of the study were 1) to characterize and model tillage operating sequence, turning pattern, and 2) to develop tillage path formation programs for autonomous tractor and evaluate the performance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.413-415
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• 2001

A railroad vehicle(Light weight electric rail car, Urban railroad, High-speed railroad) need to construct propulsion- system capacity experiment equipment to test performance or to estimate confidence. Experiment equipment in interior have been used Flywheel which is equal to the same inertia as railroad straight moment. But mechanical inertia using flywheel don't change inertia and can't embody traveling-struggle which is similar to actual traveling-struggle. We propose the method to embody electric railroad load system with inertia using electric servo motor in order to get the characteristic of real vehicle load, and confirm this algorithm with simulation and experiment.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제17권1호
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• pp.93-106
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• 2010

We employ the methods of Lattice Dynamical System to establish a global model extending the Walrasian evolutionary cobweb model in an independent single local market to the global market evolution over an infinite chain of many local markets with interaction of each other through a diffusion of prices between them. For brevity of the model, we assume linear decreasing demands and logistic supplies with naive predictors, and investigate the traveling wave behaviors of global price dynamics and show that their dynamics are conjugate to those of H$\acute{e}$non maps and hence can exhibit complicated behaviors such as period-doubling bifurcations, chaos, and homoclic orbits etc.