• Title, Summary, Keyword: Platform

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Development of a 6DOF Motion Platform for the Tilting Train Simulator (틸팅 차량용 시뮬레이터를 위한 6자유도 운동판 개발)

  • Kim Nam-Po;Song Young-Soo;Han Seong-Ho;Choi Kang-Yeon;Kim Jung-Seok
    • Journal of the Korean Society for Railway
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    • v.8 no.1
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    • pp.27-33
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    • 2005
  • This paper presents a development of 6DOF motion platform far a tilting train simulator. The tilting train simulator will be used to verify the tilting electronics and tilting control algorithm which are to be applied the Korean 180km/h tilting train. The tilting train simulator is composed of a 6-axis motion platform, a track generation system, a graphic user interface, and a visualization system with 1600mm-diameter dome screen. In this study, the 6DOF motion platform for a tilting train simulator has been designed and manufactured. The motion platform developed is a motion platform of Stewart type. The inverse kinematic analysis has been performed to determine the length of the links of the platform. Furthermore, the specification of the motors have been evaluated by the equation of motion of the platform.

A Comparison analysis of Gapjil and Platform Tyranny Cases (갑질 사례와 플랫폼 횡포 사례의 비교 분석)

  • Kang, Byung Young
    • The Journal of Information Systems
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    • v.29 no.1
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    • pp.225-240
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    • 2020
  • Purpose The purpose of this study is to identify features of Gapjil and platform tyranny through South Korea's Gapjil and platform tyranny cases and to suggest countermeasures to both kinds of cases and follow-up study subjects. Methodology/approach We examined South Korea's Gapjil and platform tyranny cases by using Big Data analytics. Then we made a close examination of the two typical cases, through which we compared features and countermeasures of Gapjil and those of platform tyranny. Findings Gapjil mostly occurred at conventional companies and franchise companies, between major and minor companies, or due to lack of owner's qualifications. The features of platform tyranny were excessively monopolistic structure of platform business, inadequate legal sanctions, and features of ICT companies. Establishment of legal bases for sanctions and education for platform participants were suggested as countermeasures.

One-way Coupled Response Analysis between Floating Wind-Wave Hybrid Platform and Wave Energy Converters (부유식 풍력-파력발전 플랫폼과 탑재된 파력발전기와의 단방향 연성 운동 해석)

  • Lee, Hyebin;Bae, Yoon Hyeok;Cho, Il-Hyoung
    • Journal of Ocean Engineering and Technology
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    • v.30 no.2
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    • pp.84-90
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    • 2016
  • In this study, a six degree-of-freedom motion analysis of a wind-wave hybrid platform equipped with numerous wave energy converters (WECs) was carried out. To examine the effect of the WECs on the platform, an analysis of one-way coupling was carried out, which only considered the power take-off (PTO) damping of the static WECs on the platform. The equation of motion of a floating platform with mooring lines in the time domain was established, and the responses of the one-way coupled platform were then compared with the case of a platform without any coupling effects from the WECs. The hydrodynamic coefficients and wave exciting forces were obtained from the 3D diffraction/radiation pre-processor code WAMIT based on the boundary element method. Then, an analysis of the dynamic responses of the floating platform with or without the WEC effect in the time domain was carried out. All of the dynamics of a floating platform with multiple wind turbines were obtained by coupling FAST and CHARM3D in the time domain, which was further extended to include additional coupled dynamics for multiple turbines. The analysis showed that the PTO damping effect on platform motions was negligible, but coupled effects between multiple WECs and the platform may differentiate the heave, roll, and pitch platform motions from the one without any effects induced by WECs.

A Study on the North and South Square-Platform at the Lecture Hall Sites of Goryeo Buddhist Temples (고려사원 강당지 남북 방형단에 관한 연구)

  • Hyun, Seung-Wook
    • Journal of architectural history
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    • v.26 no.2
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    • pp.67-74
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    • 2017
  • A very unique case is found in the architectural remains related to the north and south square-platform at the lecture hall site of Hwangnyongsa, that of Anyangsa, and the estimated lecture hall site of Beopsusa as they are not observed in the other lecture halls. The platform has been discovered at only those three Buddhist temples from Goryeo, and its case has not been found in ancient Buddhist temples of China and Japan. This study thus set out to investigate the north and south square-platform at lecture hall sites by examining in details its architectural remains at the three Buddhist temples and reviewing the Buddhist literature about the lecture halls of ancient Buddhist temples. Based on the findings, it was estimated that the architectural remains of north and south square-platform at the lecture hall sites of Buddhist temples were those of platform for Buddhist sermons or those of high chair platform. While the north square-platform involved the remains of north high chair for the Lecturer that gave lectures on the Buddhist scriptures, the south one did those of south high chair for the Reader who recited the Buddhist scriptures.

An Application of Evolutionary Game Theory to Platform Competition in Two Sided Market (양면시장형 컨버전스 산업생태계에서 플랫폼 경쟁에 관한 진화게임 모형)

  • Kim, Do-Hoon
    • Journal of the Korean Operations Research and Management Science Society
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    • v.35 no.4
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    • pp.55-79
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    • 2010
  • This study deals with a model for platform competition in a two-sided market. We suppose there are both direct and indirect network externalities between suppliers and users of each platform. Moreover, we suppose that both users and suppliers are distributed in their relative affinity for each platform type. That is, each user [supplier] has his/her own preferential position toward each platform, and users [suppliers] are horizontally differentiated over [0, 1]. And for analytical tractability, some parameters like direct and indirect network externalities are the same across the markets. Given the parameters and the pricing profile, users and suppliers conduct subscription game, where participants select the platform that gives them the highest payoffs. This game proceeds according to a replicator dynamics of the evolutionary game, which is simplified by properly defining gains from participant's strategy in the subscription game. We find that depending on the strength of these network effects, there might either be multiple stable equilibria, at which users and suppliers distribute across both platforms, or one unstable interior equilibrium corresponding to the market tipping in favor of either platform. In both cases, we also consider the pricing power of competing platform providers under the framework of the Stackelberg game. In particular, our study examines the possible effects of the type of competition between platform providers, which may constrain the equilibrium selection in the subscription game.

The Interface Scheme and Application Between Rolling Stock System and PSD (철도차량시스템과 PSD간 인터페이스 방안 및 적용 현황)

  • Lee Jong-Seong;Min Young-Ki;Kim Kyoung-Shik;Choi Jong-Mook
    • Proceedings of the KSR Conference
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    • pp.1510-1512
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    • 2004
  • Platform Screen Door System is a facility on platform to separate platform from track, having automatic sliding door structures interlocked to opening and closing of train door with integrated control unit. When a train comes to a stop at a designed position at a station, onboard ATC/ATO system transmits train berth signal to wayside signaling system. In case of automatic/driverless operation, opening and closing of the Platform Screen Door will be controlled by wayside signaling system. Unfortunately, we often see the case in news that passengers fall into track and their contact with train lead to critical accidents. However, passengers will be free from such accidents on the platform with the Platform Screen Door System. Especially during the rush hours, to ensure passenger's safety and smooth getting on & off, it is necessary to arrange. some station staffs on the platform without the Platform Screen Door System. On the other hand, the Platform Screen Door System will realize such operation by fewer staffs. Due to the above reasons, the Platform Screen Door System is becoming more popular in subway system recently.

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Concept of Spatial Information Social Platform and Role of Government as a Platformer (공간정보 소셜플랫폼의 개념과 플랫포머로서 정부의 역할)

  • Choi, Won-Wook;Hong, Sang-Ki;Shin, Dong-Bin;Ahn, Jong-Wook
    • Spatial Information Research
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    • v.20 no.4
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    • pp.37-45
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    • 2012
  • Moving forward on smart society, change of the way to solve the spatial issue used in information society is required. In order to be competitive and sustainable spatial information service, existing "spatial information open platform" strategy needs to be transformed into "spatial information social platform". The requirement for the spatial information open platform to be socialized and evolved into the spatial information social platform is investigated with respect to the characteristics of social platform P. Savalle(2010) suggested. Based on the investigation, the definition of spatial information social platform is formulated. Several roles of the government as a platformer to create and manage the spatial information social platform are suggested.

Development of Terrain-Adaptive Attitude Controller for Hybrid Mobile Platform with Wheel & Track (휠-트랙 하이브리드 모바일 플랫폼을 위한 지형 적응성 장애물 극복 자세 제어기 개발)

  • Kwak, Jeong-Hwan;Kim, Yoon-Gu;Hong, Dae-Han;An, JinUng
    • IEMEK Journal of Embedded Systems and Applications
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    • v.7 no.2
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    • pp.61-70
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    • 2012
  • This paper describes terrain-adaptive attitude controller for a hybrid mobile platform which operates in wheel & track mode. The wheel mode of the hybrid mobile platform allows quick driving performance in the flatland, while the track mode provides adaptive movement in the rough ground or stairway. The switching of the platform between two modes is automatically controlled by attitude controller algorithm. In addition, in the track mode, the platform automatically adjusts its attitude angle to overcome the obstacles in front. This paper demonstrates the attitude controller for the aforementioned wheel-track hybrid mobile platform in order to overcome terrain obstacles by using an adaptive method. The driving performance of the hybrid mobile platform has been tested and verified in various surrounding environments in both wheel and track mode. Further, this paper presents the experiments by using the track structure of mobile platform on forming adaptive attitude under various types of obstacles. The practicability and effectiveness of the proposed attitude controller of the platform has been demonstrated in urban building and a test-bed.

Spin-stabilized platform model with two input and two output (2-입력 2-출력을 갖는 자전 안정화 플랫트폼 모델)

  • 유인억;이상정
    • 제어로봇시스템학회:학술대회논문집
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    • pp.804-807
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    • 1996
  • In this paper, a new model of TDF(two degree of freedom) spin-stabilized platform has been suggested. The platform driving signal modulated in the spinning frequency is described in demodulated form keeping its precession angular velocity. When a strong spinning torque exists, the cross-axis spring constant cannot be neglected in modelling of the platform precession dynamics. A linearized dynamic model of spin-stabilized platform pointing loop is derived and validated through the comparison between simulation and experimental results.

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