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Performance Analysis of an Explicit Guidance Scheme for a Launch Vehicle (발사체 직접식 유도법의 유도성능 분석)

  • 최재원
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.6
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    • pp.97-106
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    • 1998
  • In this Paper, a fuel minimizing closed loop explicit inertial guidance algorithm for orbit injection of a rocket is developed. In the formulation, the fuel burning rate and magnitude of thrust are assumed constant. The motion of rocket is assumed to be subject to the average inverse-square gravity, but negligible effects from atmosphere. The optimum thrust angle to obtain a given velocity vector in the shortest time with minimizing fuel consumption is first determined, and then the additive thrust angle for targeting the final position vector is determined by using Pontryagin's maximum principle. To establish real time processing, many algorithms of onboard guidance software are simplified. The explicit guidance algorithm is simulated on the 2nd-stage flight of the N-1 rocket developed in Japan. The results show that the explicit guidance algorithm works well in the presence of the maximum $\pm$10% initial velocity and altitude errors, and exhibits better performance than the open-loop program guidance. The effects of the guidance cycle time are also examined.

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A Study for Parking Characteristic of A Large Scale Event (대규모행사시 주차장 이용특성 분석)

  • Lee, Young-Woo
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.3
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    • pp.191-197
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    • 2006
  • Prepare need in each branch for a large scale event. especially prepare for transportation problem is very important. most research for until at now parking prepare according city management however, parking prepare for large event is a necessity which it will parking characteristic. accordingly this research is conducted study for parking prepare subject of large event. this study result, vehicle demand for parking by stadium have many but vehicle demand for parking off stadium have few. accordingly large parking supply is ineffective. shuttle bus service in principal position of city is effective. study result showed that it included 85% parking at 6~7hour before large event start time. accordingly disposition time of parking manager is desirable 6~7hour before large event start time.

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Long-term Fading Statistics-Based Power Allocation for Fixed Decode-and-Forward Relays

  • Kong, Hyung-Yun;Bao, Vo Nguyen Quae
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.12A
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    • pp.1138-1146
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    • 2008
  • This paper considers 2-hop wireless cooperative communications networks with fixed decode-and-forward relays. Specifically, we first derive the closed-form BER expression for theoretically evaluating the end-to-end performance of these networks. Then, based on this expression and long-tenn fading statistics, we propose a power allocation method for source and relay. Such a method brings about multiple advantages in tenn of spectral efficiency and implementation complexity over other power allocation methods based on instantaneous fading statistics. A variety of numerical results reveal that the cooperative communications scheme with the proposed power allocation significantly outperforms that with the equal power allocation and the direct transmission scheme for any position of the relay subject to the same total transmit power constraint.

The requirement deduction plan research for the organization composition of process base (프로세스 기반의 조직 구성을 위한 요건 도출 방안 연구)

  • Hong, Seon-Ho;Kim, Young-Tae;Lim, Gyeong-Mi
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.360-364
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    • 2009
  • To verify the suitability of the Railroad safety requirements analysis, the actions of the function which it follows in a given operation condition are composed of the rule model or the state model. And it test must be possible. The subject of condition transfer in compliance with the transfer condition which is an event of system it will be able to accomplish the operation of system. However, tasks allocated to the actor are the duty which is added in organization. This time, the start of duty task is started in compliance with an external or internal condition. If there are 9 tasks which have one objective, the relationship among the previous and the current internal tasks and next tasks which will given is able to show in logical model. Thus when planning an organization, the integral part of class must include Task, Role and Position. And this time we make a series of outputs of examination of organizing model and examples to meet the capable skill.

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Relationship between the Zhejiang Province area(China) and wooden architecture from the Koryo Period based on the beam and the structure (보 결구를 통해 본 중국 절강지역과 고려시기 목조건축과의 관계 - '차견(箚牽)'과 초방(草枋), '묘량(猫梁)'과 우미량(牛尾梁)을 중심으로 -)

  • Lee, Yong-Jun
    • Journal of architectural history
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    • v.15 no.4
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    • pp.75-86
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    • 2006
  • Korea is closed to China in the geographical position and is related to China as two countries have developed similar culture, art, and social systems. Architecture is a kind of culture and has advanced in the wooden architecture with a considerable change. The study investigated a phylogenetic relationship between two countries based on characteristics of architectural universality. With comparison and analysis on the common feature and difference of the beam and structure in the wooden architecture from the Koryo and Zhejiang Province(China), the systemicity of the wooden architecture was examined. The beam is a part of timber which is consist of the wooden structure frame and also a crucial subject to understand a development process of the wooden architecture.

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Changes of Spatial Composition by Project Phase of Homebase and Media-space on Variation Type Middle and High Schools (교과교실제 중등학교 홈베이스와 미디어스페이스의 사업단계별 공간구성 변화)

  • Park, Im-Ho;Jung, Jin-Ju
    • Journal of the Korean Institute of Educational Facilities
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    • v.21 no.2
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    • pp.13-24
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    • 2014
  • This study compared and analyzed middle and high school's homebase and media space which are installed along with the introduction of subject classroom system operation method, with regard to the position of arrangement, the type of arrangement, and the change of area, etc. which were changed and applied per the phase of project. For this, design competitions were implemented since 2006 targeting the cases which participated in design directly-indirectly in the researcher's architectural firm, present construction documents among the selected BTL(Build-Transfer-Lease) were completed, and the examples of 10 schools(design competitions 2 schools, BTL selected plans 8 schools) were analyzed, which were operating variation type.

A Control Chart for the Improvement of Low Defective Process (저수준 불량 공정의 개선을 위한 관리도)

  • 박기주
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.21 no.45
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    • pp.375-381
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    • 1998
  • For products that are subject to inspections that lead to either acceptance or rejection, the p chart or control chart for proportion defective is applicable. The charting technique approach to quality control aims at alerting its user to any presentations in the properties of a manufactured product. This article presents an important tool available for quality control of a production process at the occurrence of defects in manufactured products at view low levels to improve the efficiency of the manufacturing productivity and to satisfy customer through the reduction of defect rates. To understand the consequences of the level of quality on competitive position, a more technical perspective is needed.

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On Output Feedback Tracking Control of Robot Manipulators with Bounded Torque Input

  • Moreno-Valenzuela, Javier;Santibanez, Victor;Campa, Ricardo
    • International Journal of Control, Automation, and Systems
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    • v.6 no.1
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    • pp.76-85
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    • 2008
  • Motivated by the fact that in many industrial robots the joint velocity is estimated from position measurements, the trajectory tracking of robot manipulators with output feedback is addressed in this paper. The fact that robot actuators have limited power is also taken into account. Let us notice that few solutions for the torque-bounded output feedback tracking control problem have been proposed. In this paper we contribute to this subject by presenting a theoretical reexamination of a known controller, by using the theory of singularly perturbed systems. Motivated by this analysis, a redesign of that controller is introduced. As another contribution, we present an experimental evaluation in a two degrees-of-freedom revolute-joint direct-drive robot, confirming the practical feasibility of the proposed approach.

A Study on the Prediction of Exterior Daylight Illuminance under Three Dimensional Hemisphere (3차원 천구에서의 외부일광조도 예측에 관한 연구)

  • Ku, H.D.;Kim, K.S.;Na, K.T.;Song, I.C.
    • Solar Energy
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    • v.19 no.1
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    • pp.47-57
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    • 1999
  • A building and the solar are related to the privilege of solar benefit. To make step, it is required to build up an object, chase the position of object and the solar, find the shadow occurrence. On the subject of direct illuminance, an intensive emission of irradiation is proposed to directly project to the benefit area. Simultaneously on the indirect illuminance, the integration of a finite element incident to the benefit area can be multiplied by the hemisphere luminance. A caution should be paid to eliminate the occupation area of the object around on the hemispherical sky, which can help run more accurate prediction.

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Prospects of Development of the Russian Asia Railway System: Geoeconomic Aspect

  • Evgeniy, Kibalov
    • International Journal of Railway
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    • v.3 no.4
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    • pp.123-125
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    • 2010
  • That Russia is potentially great transport power becomes obvious if look to map of any route. The geographical position of the Russian Federation unequivocally specifies intended by nature the role of geobridge between the countries of Asia-Pacific Region and Europe. However, in construction engineering practice and feasibility study the construction of difficult and strategically important bridges is generally joins in wider concept of bridge crossing. The last includes not only actually the bridge(through the river, gulf, etc.), but also approaches to it, which construction in view of features of a relief and a configuration of new transport communications which have already developed and subject to construction not less difficult technically and not only economically expended, than building of the basic artificial construction.

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