A spiral flow path was applied to solve the problem of the existing straight flow path in the leveling shaft, a key component of the self-levelizer that can maintain the height according to the change in payload in EV, SUV. In this study, flow analysis was performed to check the velocity, pressure drop, and flow direction of oil according to the main operating conditions of the leveling shaft with a spiral flow path. As a result of the study, a leveling shaft with a spiral flow path is likely to improve fluid properties around the orifice and inlet valve under compression conditions, and it is judged to have a development application effect.

A microfluidic pump is a key component to controllably actuate fluids in Lab on a chip devices. To overcome technical issues of a diaphragm-type pump, a valveless nozzle-diffuser type pump was developed by utilizing the different flow resistance to control a dominant flow direction by means of diaphragm actuation. In this work, based on the operating mechanism of the nozzle-diffuser type pump, we propose a new concept of a valveless pump which can generate asymmetric flow through a pump chamber. In the proposed valveless pump, asymmetric flow path structures play a role of a nozzle-diffuser installed to a pump chamber. To validate the concept of the proposed valveless pump, we conducted CFD simulations for different geometries of the flow path structures. Based on the CFD simulations, we found that the dominant flow direction can be selectively manipulated by the pump actuation and an optimal shape of the asymmetric flow path structure was proposed to maximize the net mass flow rate through the pump chamber.

본 연구는 온라인 게임 이용자들의 게임몰입을 예측하는데 있어, 개인의 셀프리더십 및 자기효능감 특성에 따른 영 향력을 경로분석을 통하여 탐색하는데 목적이 있다. 본 연구의 목적을 위해 경기도에 위치한 240명의 대학생들이 연 구에 참여하였으며 최종 228부의 설문자료를 분석하였다. 이에 따른 연구결과는 다음과 같다. 자기효능감의 하위요인 인 자신감은 게임 이용자의 게임몰입에 영향력을 가졌으나 자기조절효능감과 과제난이도선호는 유의하지 않아 부분적 인 영향력을 미치는 것으로 도출되었다. 또한 개인의 셀프리더십 중 자기비판은 자신감에, 자기설정목표와 자기존중은 모두 자기조절효능감과 과제난이도선호에 영향을 미치는 것으로 나타났다. 즉 높은 수준의 셀프리더십을 가지고 있는 대상자가 자기효능감에 긍정적 영향을 미치며, 이는 게임몰입에 부분적인 영향력을 가지고 있는 것으로 나타났다. 이 러한 연구결과를 토대로 본 연구는 게임 이용자가 게임몰입에 어떠한 과정에 의하여 도달하는지를 제안하며, 개인의 심리적 특성에 따른 게임몰입의 긍정적 영향력에 대한 시사점을 제공할 것이다.

Many intelligent robots have to be given environmental information to perform tasks. In this paper an intelligent robot, that is, a cleaning robot used a sensor fusing method of two sensors: LRF and StarGazer, and then was able to obtain the information. Throughout wall following using laser displacement sensor, LRF, the working area is built during the robot turn one cycle around the area. After the process of wall following, a path planning which is able to execute the work effectively is established using flow network algorithm. This paper describes an algorithm for minimal turning complete coverage path planning for intelligent robots. This algorithm divides the whole working area by cellular decomposition, and then provides the path planning among the cells employing flow networks. It also provides specific path planning inside each cell guaranteeing the minimal turning of the robots. The proposed algorithm is applied to two different working areas, and verified that it is an optimal path planning method.