• 한국항공우주학회지
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• 제39권11호
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• pp.1042-1051
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• 2011

본 논문에서는 복수 무인기의 편대 비행을 위한 탑재 무선 통신 및 임무통제 네트워크 (지상관제시스템)를 포함하는 통합 운영 시스템의 구성 방안을 제시한다. 이를 위해 편대비행을 위한 무인기에 탑재되는 시스템들의 구성 형태에 따라 다양한 운영 시스템들을 분류하였다. 또한 각각의 운영 시스템에 대한 장단점 및 고장에 대한 신뢰성을 파악하였다. 이 결과를 바탕으로 편대기의 임무비행을 수행하는데 있어 적절한 운영 시스템의 형태를 결정하고 구성 요소들을 개발하였다. 제안된 운영 시스템을 이용하면, 이종의 비행체로 편대를 구성할 수 있으며, 복잡한 임무를 여러 무인기에 나누어 수행 가능하고, 단일 임무의 협업 또는 다양한 임무의 동시 수행이 가능하다.

• 대한임베디드공학회논문지
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• 제17권2호
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• pp.115-121
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• 2022

This paper proposes a distributed model predictive formation control algorithm for a group of unmanned ground vehicles (UGVs) with guaranteeing collision avoidance between UGVs. Generally, the model predictive control based formation control has a disadvantage in that it takes a long time to compute control inputs when considering collision avoidance between UGVs. In this paper, in order to overcome this problem, the formation control algorithm is implemented in a distributed manner so that it could be individually controlled. Also, a collision-avoidance method considering real-time is proposed. The proposed formation control algorithm is implemented based on robot operating system (ROS), open source-based middleware. Through the various simulation tests, it is confirmed that the formation control of five UGVs is successfully performed while avoiding collisions between UGVs.

• 한국산학기술학회논문지
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• 제18권5호
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• pp.200-210
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• 2017

본 연구는 조선후기 병서 중 "이진총방"의 진도(陣圖)를 바탕으로 고전 진법의 기본모형(陣形)을 재구성하여 진법의 구성원리와 운영체계를 분석하였다. 연구방법은 고전진법의 기본인 방진(方陣)을 토대로 원진(圓陣), 직진(直陣), 곡진(曲陣), 예진(銳陣) 등의 오방진(五方陣)과 현무진(玄武陣), 팔진(八陣), 육화진(六花陣), 구군진도(九軍陣圖) 등 진법의 운영체계를 재구성하여 비교분석 하였다. 분석결과, 모든 진법의 운용은 기본적으로 방진에서 출발하되 정사각, 직사각, 오각형 그리고 원형의 형태로 변형되고 있음을 확인하였다. 또한 진법 내부의 진용 구성은 5가지 선형을 활용하는 바 직사각, 정사각, 대각선, 곡선, 원형 등 5가지 동선체계로 이루어져 있음을 확인하였다. 연구대상인 원진도는 기본방진에서 2중 원의 선형으로 동선체계를 갖추고, 예진도는 기본방진의 편성대열에서 여타 진법보다 최소의 동선거리로 공격적 선형을 갖춘다. 곡진도는 방패형 2중진 형태로 이동동선을 유지하고, 현무진도는 거북모양의 진형으로 좌우 균형의 5각형 동선을 형성한다. 육화진은 원이 지니는 회전력을 무기로 삼는 진법으로 좌우 및 상하 대칭으로 원주율이 같은 여섯 개의 원형동선을 형성하여 꽃잎모양의 선형(線形)을 갖춘 형태이다. 구군진도는 육화진도에서의 원형 대신 9개 정사각형 선형(線形)을 갖추는 방식이다. 팔진도는 정사각, 직사각, 십자형의 3가지 선형으로 14개 진형을 형성하며 면과 선, 외곽선과 대각선의 중층적 3중 방어체계를 갖춘 동선체계이다. 연구 성과는 군사적인 면에서 진법의 실체를 규명함으로써 조선시대 전투양상의 실체를 파악하게 해주면서, 현대전에서 병사들의 훈련에 활용가능한 병법의 유형을 제시한 점에서 군사적, 학술적 가치를 지닌다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.979-984
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• 2005

2005, National railway was converted from government enterprise form to public corporation form. Korail is facing in necessity to equip new manpower operating system to achieve public enterprise's part and two purposes called profit creation according to conversion to construction system. Accordingly, railway construction work began services for formation diagnostic and job analysis to construct management formation of new paradigm, personnel management course manpower operation system of the job value priority. This dissertation is research for direction establishment of human resource management(HRM) of railway construction work. Examined problem of current personnel management system with trend of HRM paradigm for this. And presented various strategy to construct greeting executive system of job putting first in person putting first and strengthens formation capacity.

• 한국염색가공학회지
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• 제16권4호
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• pp.10-18
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• 2004

In this work, Aqueous sericin solution was prepared by degumming process with electrolytic reduction water. Then, the microfiltration and ultrafiltration systems were applied to the concentration of aqueous sericin solution. The objective of this study was to select the optimum operating condition among the different pressure. The permeate flux and rejection ratio were observed with time, pressure, flow rate and concentration. and, the wastewater and permeated water quality values such as pH, BOD, COD, and NH levels were measured. In order to see the influence of electrolytic reduction water, the flux of pure water and electrolytic reduction water by PVDF22(MF) and PS100(UF) membrane was measured. In microfiltration system, the relative flux reduction decreased rapidly to 0.02 in the 30min, as the concentration polarization and gel layer formation were increased. and then the sericin concentration rejection ratio was 40%. In ultrafiltration system, the permeate flux decreased with time and concentration, and increased with the operating pressure and flow rate. Optimal condition in PS100 membrane system for sericin concentration was operating pressure 1.464kgf/$cm^24, operating flow rate $7\ell/min at\; 40^{\circ}C$. At that time, sericin concentration rejection ratio was 83% respectably. The sericin solution was concentrated from 0.1wt% solution to 0.2 wt % solution during about 2 hrs by the UF filteration membrane system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 창립기념 춘계학술대회 논문집
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• pp.349-358
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• 1998

This study was carried out about the design and the performance study of propulsion system for Korean High Speed Train of maximum operating speed of 350km/h. The propulsion system was studied to two parts the formation of power transmission and the performance of traction system base on Korean-TGV. For maximum operating speed of 350km/h at Seoul-Pusan high speed line, the power of train should be have the remaining acceleration of 0.058m/s/s and the slopeability of 6%o. This performance study of propulsion system would be continued for defining of adhesion factor, friction factor and aerodynamic factor assumed to analysis and simulation.

• 대한기계학회논문집B
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• 제22권12호
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• pp.1755-1762
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• 1998

In order to minimize emission of polychlorinated dibenzo dioxins and polychlorinated dibenzo furans (PCDD/PCDFs) from municipal solid waste incinerators, it is important to maintain optimized operating conditions along with the system modification/improvement. Operating conditions of MSW incinerator make very complicated influence on formation of PCDD/PCDFs in each unit apparatus. For revealing these influences, concentrations of PCDD/PCDFs are measured from the stack and from the fly ash, while monitoring the plant operating conditions. The effects are grouped into 3 main categories, combustion conditions, de Novo synthesis effects, and adsorption/destruction effects in the flue gas treatment system. Interpretation of the results showed that de Novo synthesis effect, reformation by metalic catalyst, especially Cu in fly ash in the temperature range of $250{\sim}500^{\circ}C$, is found to influence most dominantly on the concentration of PCDD/PCDFs. A plausible mathmatical model for predicting concentration of PCDD/PCDFs is proposed, and discussed.

• 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.

• 한국연소학회지
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• 제22권3호
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• pp.8-16
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• 2017

MILD combustion was first developed to suppress thermal NOx formation in combustor for heating industrial furnaces. In this paper, the effect of co-flow MILD combustor geometry and operating conditions on the formation of MILD combustion was analyzed using 3 dimensional numerical simulation. The numerical simulations were carried out using ANSYS Fluent. The combustion and turbulence flow was modeled using the Eddy Dissipation Concept(EDC) model and realizable $k-{\varepsilon}$ model respectively. The results show that the high temperature region and average temperature decreased due to an increase in the air velocity and decrease the wall thickness of fuel nozzle. In particular, the MILD combustion flame was found to be stable with a combustion flame region at fuel velocity 10 m/s, air velocity 20 m/s, fuel nozzle thickness 1.0 mm, equivalence ratio 0.9, and outlet area ratio 40%.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2004년도 동계학술대회 논문집
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• pp.9-9
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• 2004