• 한국게임학회 논문지
• /
• 제9권6호
• /
• pp.105-116
• /
• 2009

인간의 동기는 목표를 세우고 행동으로 옮기는 원인을 제공한다. 때문에 인간과 유사한 에이전트의 행동을 실현하기 위하여 동기를 활용한 연구가 진행되고 있다. 그러나 현재 연구에서 동기를 활용한 연구는 정적 환경에서의 연구로서, 동적 환경에서의 예기치 못한 상황에 대처가 어렵다. 동적인 환경에서는 에이전트 스스로 목표 설정이 가능해야 한다. 또한 최종으로 선택되는 목표가 명확하고 빠르게 설정되어야 한다. 이 연구에서는 에이전트 스스로 목표를 설정하기 위해 동기를 이용한 동기 결정 기법을 제안한다. 제안하는 기법은 실시간으로 환경을 인지하여 발생된 동기를 단계별로 비교하여 최종 동기를 추출한다. 추출된 동기는 에이전트의 목표 설정 및 실행에 이용한다. 제안한 기법의 타당성을 위해 가상환경 내에서 각기 다른 특성을 가진 에이전트의 행동을 비교하는 실험을 수행하였다. 실험 결과 여러 동기가 발생 했을 경우 에이전트에 따라 현재 상황에서 가장 적합한 동기를 찾아 작용하는 것을 확인하였다. 이를 통해 각각의 에이전트가 동기 결정을 통해 추출된 최종 동기를 이용해 동적 환경에서 상황에 따라 행동할 수 있는 최적의 목표 설정이 가능함을 알 수 있었다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.1868-1873
• /
• 2011

In this paper, a theoretical formulation of a simplified wheel-set model for collision-induced derailments was evaluated by numerical simulations for the wheel-climb derailment and wheel-lift derailment types. The derailment types were classified into the wheel-climb derailment and the wheel-lift derailment according to the friction force direction of the wheel-flange. The wheel-climb derailment type was classified into Climb-up, Climb/Roll-over, and Roll-over-C, and wheel-lift derailment type was classified into Slip-up, Slip/Roll-over and Roll-over-L. To verify the theoretical equations derived for the wheel-climb derailment and the wheel-lift derailment, dynamic simulations using RecurDyn of Functionbay and Ls-Dyna of LSTC were performed and compared for some examples. The derailment predictions of the suggested theoretical formulation were in good agreement with those of the numerical simulations. The direction of the frictional force between the wheel-flange and the rail can be well predicted using the suggested derailment formulation at a initial derailment.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1995년도 추계학술대회 논문집
• /
• pp.880-884
• /
• 1995

Manufacturing environment is getting characterized by unstable market demand,short product life cycle and timebased competition. For adapting this environment,machine tools have to be further versatile functionally in order to reduce part's set-up time. Unlike existing manufacturing systems mainly to focus on part flow, it is important to control tool flow using fast tool change device and tool delivery device in parallel machines consisting of versatile machine tools, because complete operations on a part can be performed on one machine tool in a single machine set-up. In this paper, under dynamic tool allocation strategy to share tools among machine tools, we propose a real-time tool allocation and operation esequence model with an objective of minimizing flow time using autonomy and negotiation of agents in parallel machines

• 한국통신학회논문지
• /
• 제28권12B호
• /
• pp.1051-1059
• /
• 2003

GMPLS는 신호 및 라우팅 기술을 기반으로 트래픽의 요구가 있을 때 동적으로 네트워크에서 경로를 설정하고 자원을 할당하는 기술이다. 또한 많은 양의 트래픽을 처리하는 특성상 네트워크의 실패(failure)가 일어났을 때 동적으로 트래픽을 보호하는 경로 보호 및 복구 메커니즘을 포함한다. 본 논문에서는 GMPLS의 신호 프로토콜 기술인 CR-LDP의 오브젝트를 확장하여 매 노드에서 자동적으로 우회 경로를 설정하여 주 경로를 보호 및 복구하기 위한 정적 우회 기법 및 동적 우회 기법을 제안하고 기존의 경로 보호 및 복구 기법과 성능을 비교 평가한다.

• Computers and Concrete
• /
• 제20권3호
• /
• pp.297-310
• /
• 2017

A CFD software was used to simulate free surface flow of SCC in the T-Box test. In total, seven simulations were developed to study the effect of rheological parameters on the non-restricted flow performance of SCC in both horizontal and vertical directions. Different suspending fluids having five plastic viscosity values between 10 and 50 Pa.s, three yield stress values between 14 and 75 Pa, one density of $2500kg/m^3$, and one shear elasticity modulus of 100 Pa were considered for suspension of 178 spherical particles of 20-mm diameter and $2500kg/m^3$ density. The results of the simulations are found to correlate well to changes in rheological parameters of the suspending fluid. Plastic viscosity was shown to be the most dominant parameter affecting flowability and dynamic stability compared to the yield stress. A new approach was proposed to evaluate performability of SCC based on a trade-off between flowability and dynamic stability.

• Wind and Structures
• /
• 제8권4호
• /
• pp.251-268
• /
• 2005

This paper describes the work of the International Association for Wind Engineering Working Group E -Dynamic Response, one of the International Codification Working Groups set up at the Tenth International Conference on Wind Engineering in Copenhagen. Comparisons of gust loading factors and wind-induced responses of major codes and standards are first reviewed, and recent new proposals on 3-D gust loading factor techniques are introduced. Then, the combined effects of along-wind, crosswind and torsional wind load components are discussed, as well as the dynamic characteristics of buildings. Finally, the mathematical forms of along-wind velocity spectra for along-wind response calculation and codification of acceleration criteria are discussed.

• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 1999년도 제30회 추계학술대회
• /
• pp.318-322
• /
• 1999

An analytical study about dynamic behavior of center pivot rocker arm type valve train system equipped with roller of diesel engine is developed. At first, a mathematical model for the dynamic analysis has been set up using the lumped parameter method. In that model, valve spring is divided as some mass elemehts so as to simulate spring surging, Then, how the design parameters, such as valve mass, rocker arm inertia, valve spring stiffness, and initial load on valve spring, affect valve dynamic behavior especially in the valve close area is scrutinized.

• 한국지능정보시스템학회:학술대회논문집
• /
• 한국지능정보시스템학회 2005년도 공동추계학술대회
• /
• pp.461-470
• /
• 2005

A dynamic supply chain that is composed of many different companies with different rent roles and interests allows free joining and secession. Buyers place orders simultaneously and manufacturers should compete each other for the orders. The purpose of our paper is how to find the optimal formation of supply chain ill a global viewpoint while allowing each member company to pursue his local goal The dynamic nature of supply chain formation causes the variation of cost depending on how many orders a manufacturer would accept. We propose a multi-agent based negotiation protocol that efficiently leads to the formation of optimal supply chain without giving up maximization of the individual profit in multi-agent environment of the make-to-order industry. The goal of the negotiation is to form a supply chain to minimize the overall sum of manufacturers' manufacturing cost, and earliness cost and tardiness cost based on SET model. We compare the negotiation protocol with Branch & Bound method. Finally, the validity and performance of buyer's negotiation has been tested experimentally.

• 한국정밀공학회지
• /
• 제24권4호
• /
• pp.84-92
• /
• 2007

Dynamic process planning requires not only more flexible capabilities of a CAPP system but also higher utility of the generated process plans. In order to meet the requirements, this paper develops an algorithm that can select machines for the machining operations by calculating the machine loads. The developed algorithm is based on the multi-objective genetic algorithm that gives rise to a set of optimal solutions (in general, known as the Pareto-optimal solutions). The objective is to satisfy both the minimization number of part movements and the maximization of machine utilization. The algorithm is characterized by a new and efficient method for nondominated sorting through K-means algorithm, which can speed up the running time, as well as a method of two stages for genetic operations, which can maintain a diverse set of solutions. The performance of the algorithm is evaluated by comparing with another multiple objective genetic algorithm, called NSGA-II and branch and bound algorithm.

• 한국자동차공학회논문집
• /
• 제20권2호
• /
• pp.47-55
• /
• 2012

This work deals with dynamic analysis of a monorail system with magnetic caterpillar where magnets are embedded inside each articulated element of the caterpillar, augmenting traction force of main rubber wheels to climb up slope up to 15 degree grade. Considerations are first given to determine stiffness of the primary and secondary suspension springs in order for the natural frequencies of car body and bogie associated with vertical, pitch, roll and yaw motion to be within generally accepted range of 1-2 Hz. Equations for calculating magnetic force needed to climb up given slope are derived, and a magnetic caterpillar system for 1/6 scale monorail is designed based on the derivation. To assess the hill climbing ability and cornering stability, and make sure smooth operation of the side and vertical guiding wheels which is critical for safety, a multibody model that takes into account of every component level design characteristics of car, bogie, and caterpillar is set up. Through hill climbing simulation and comparison with measurement of the limit slope, the validity of the analysis and design of the magnetic caterpillar system are demonstrated. Also by studying the curving behavior, maximum curving speed without rollover, functioning of lateral motion constraint system, the effects of geometry of guiding rails are studied.