Kibeom Lee

Development of a Foldable Micro Electric Vehicle for Future Urban Driving with Intelligent Control

There have been continuous efforts from global automotive industries with the new environmental regulations in order to reduce air pollution, to mitigate the global warming and to emphasize low carbon green growth. Micro mobility can be a new mode of transport that is being develop in order to provide a potential solution to the above issues. This paper introduces the foldable micro electric vehicle and focuses on prototype design and control architecture of that. The innovative design of folding mechanism and the motor control system without position sensing is proposed. This method uses current information from Energy Management System (EMS) to estimate position of the folding motor. In-wheel drive control system for micro mobility is proposed.

Study on Collective Memory in the Blogosphere

With the change to Web2.0 Internet environmentand the popularization of blogs, people write various writings freely on the Internet such as daily events, movie reviews, news, etc. Here, we can find writings on personal experiences from the past or on past popular culture. This paper analyzed collective memory through the blogosphere. We define blog posts that qualify as containing collective memory, find the types of collective memory through analyzing comments and trackbacks, and observe how people share their memories and interact with others. The results of the analysis show that blog posts that form a collective memory have more interactions than regular blog posts and that the types of comments include those that provide information, exchange information, and reminisce. Through these results, we derive a model for collective memory and show a prototype of a system based on the model. This study has a significance in that it rediscovers memory activities of people through the analysis of the collective memory phenomenon on the Internet.

Torque Distribution Algorithm of Independent Drive Articulated Vehicle for Small Radius Turning Performance

굴절차량은 차량의 회전 성능의 향상을 위하여 차량의 중 간에 회전 관절이 장착되어 있는 차량을 의미한다. 이러한 굴절차량은 일반적으로 높은 수송능력을 목적으로 하며 굴 절 구조로 인하여 제어가 어렵기 때문에 기차, 트램 등 궤 도를 따라 주행하는 차량에 사용 되어 왔다. 최근 환경문제로 인하여 기존 교통수단을 대체할 친환경 교통 수단 들이 개발되고 있으며, 그 중 하나로 굴절차량의 일반 도로 적용이 검토되고 있다. 이러한 차량은 일반 도로 를 주행하기 때문에 높은 운영 유연성을 가지며 경전철 등 다른 교통수단 보다 건설 비용이 저렴하다. 또한 큰 수송 수 요에 대응이 용이하다는 장점이 있다[1,2]. 반면 고무 차륜을 통하여 구동이 되므로 주행 중 노면의 영향을 받을 수 있다는 단점이 있고, 전용 궤도를 달리지 않 고 일반 도로를 주행할 수 있기 때문에 다른 차량과의 간 섭을 피해야 하는 등 차량의 정밀한 제어가 필요하다. 또한 기존의 차량보다 큰 회전반경과 차량 선회 폭을 갖기 때문 에, 도로의 확폭과 전용 도로 설계가 필요하다는 단점이 있 다. 이러한 단점을 최소화 하기 위하여 능동적으로 토크를 분배하여 최소 회전반경을 줄이는 알고리즘을 제안하고자 한 다. 현재 승객 수송을 목적으로 개발된 굴절차량은 Fig. 1과 같이 한국철도기술연구원(KRRI: Korea Railroad Research Institute)의 바이모달 트램과, APTS사의 Phileas 등이 있다 [3]. 이 논문에서는 고무차륜을 이용하여 일반 도로를 주행하 는 굴절차량의 제어 요소들에 대하여 소개한다. 굴절차량의 Abstract The articulated structures seen in train or tram applications are being applied in road transportation systems, for use in mass passenger transit. When articulated vehicles are driven on public roads, they no longer follow a guided track. Therefore, there are a lot of control elements that need to be considered, such as turning radius, swept path width, off-tracking, and swing-out. Some of the currently available articulated vehicles on roads are equipped with an independent drive system; a system that has one motor at each wheel. Through this drive system, each wheel can be independently controlled, making precise and quick dynamic stability control possible. In this paper, we propose a torque distribution algorithm that can reduce the overall turning radius of the articulated vehicle, which has been verified through dynamic simulation.

Feasibility Analysis on Ground-level Stations and Wireless Power Transfer Technology Applications for Monorail Systems

Subway systems have been a proved method of public transport and are widely used in major cities around the world. However, the time and cost it takes to construct such systems are very high, as it requires underground tunnels. Cities in various countries have implemented monorail systems as public railway transport as it can be more economical and quicker compared to subway systems in terms of construction. In addition, it provides more convenience towards the public as it is not affected to traffic, and also provides an aerial view of the city. However, the overall construction cost for monorail systems is still significantly high, and as a possible solution to further reduce the overall cost, implementation of ground-level stations and wireless power transfer technology has been proposed in this paper. A concept application layout of ground-level stations and wireless power transfer systems has been discussed, using the Daegu monorail Line 3 system as a simulation base. The expected cost for monorail systems implementing groundlevel stations and/or wireless power transfer technology has been estimated based on literature survey, and was compared with the current construction cost of Daegu monorail system. Based on comparison, it has shown that implementation of ground-level stations are the most economical, and can be easily implemented for either starting or expanding the monorail line. Implementation of wireless power transfer technology is also economical, but is more feasible when starting a new monorail line as it requires components which will alter the configuration of the train and infrastructure.

Introducing a current-based interactive plant

Until now, there have been several approaches to connect and communicate with objects around us. Akousmaflore[1] and Kimapetra[2] are examples of such approaches, in which they provided a channel of communication to objects through specific actions. In this paper, we propose a new method for interacting with both organisms and objects, using the change in electric current when a user conducts a gesture on the target of interaction, ultimately widening the spectrum of the objects reaction based on the users behavior. For our installation, we used a plant as the main target of interaction.

Bubble Letters: a child-centric interface for virtual and real world experience

In this paper, we suggest a new interactive game for children, Bubble Letters, which allows children to experience both real and virtual environments by interacting with physical interfaces. A user composes a message from the screen and displays it on the public screen. With this process, children can learn how to compose and deliver their messages to their friends with fun, and may also develop a conception of the world by involving physical interactions. Adults can also enjoy Bubble Letters by retrieving childhood memories through childlike acts with their children.