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이원태(Wontae Lee),김영현(Younghyun Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The steering system of forklifts should have enough rigidity in order to minimize deformation caused by the wheel operation and to block the vibrations from engine, hydraulic systems and the road surface. Especially, the steering system of the small-class forklift has disadvantage in vibration transmission path since it is difficult to obtain proper structural stiffness. In this paper design optimization technique of the steering system for small-class forklifts considering idle vibration reduction is presented. Two types of engines are mounted with small-class forklift; 2-ton class forklift with 3-cylinder and 3-ton class forklift with 4-cylinder diesel engine. Considering the excitation frequency of the engines, the vehicle body and steering system of the forklift were designed to minimize the idle vibration.
소셜미디어 유력자의 네트워크 특성 : 한국의 트위터 공동체를 중심으로
이원태(Wontae Lee),차미영(Meeyoung Cha),양해륜(Haeryun Yang) 서울대학교 언론정보연구소 2011 언론정보연구 Vol.48 No.2
본 연구는 최근 트위터와 같은 소셜미디어에서 의제설정, 여론형성 등에 큰 영향력을 발휘하고 있는 새로운 유형의 오피니언 리더, 즉 소셜미디어 유력자들(social media influentials)의 네트워크 특성과 역할을 규명하는 것을 목적으로 한다. 연구결과 한국의 트위터 유력자들은 글로벌 네트워크와는 달리 이용자 상호작용(user interaction)의 측면에서 매우 강력한 네트워크 호혜성을 특징적으로 보여주고 있으며, 이들 트위터 유력자의 영향력도 그들이 보유한 팔로어 규모에 의존하기보다는 적극적인 리트윗(RT)을 매개로 하는 수많은 팔로어들과의 개방적 소통방식에 의해 적극 추동된다는 점을 보여주었다. 특히 ‘매개적 유력자(intermediary influentials)’의 역할에서 보듯이, 강력한 유력자 네트워크의 이면에는 네트워크 구성원들의 추천과 평판에 기반한 쌍방향적인 의사소통이 놓여 있음을 알 수 있다 This study aims to shed light on the network property and roles of social media influentials who are emerging as a new type of opinion leaders in setting the agenda and forming public opinions on online social networking sites such as Twitter. The result shows that the Korean Twitter influentials exhibit very strong reciprocity in terms of topology and user interaction. Their impact on other users relies more on open communication with followers via retweeting (RT) than on how many followers they have. In particular, beneath the surface of the powerful influentials network, intermediary influentials engage in interactive communications with the network members based on peer recommendation and reputation.
소형 지게차의 Idle 진동 저감을 위한 차체 구조 최적 설계
이원태(Wontae Lee),김영현(Younghyun Kim) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
A diesel forklift truck under 3-ton class has disadvantages in the vibration transmission path. Because the weight ratio of body structure to powertrain which is source of excitation force is lower th an a midclass forklift. In addition, the torsional and bending vibration mode frequencies of body structure are within the engine excitation frequency range, then high idle vibration generated by resonance. In this paper vehicle body structure design and optimization technique considering idle vibration reduction are presented. Design sensitivity analysis is applied to search the sensitive of design parameters in body structure. The design parameters such as thickness and pillar cross section were optimized to increase the torsional and bending vibration mode frequencies.
이원태(Wontae Lee),민희(Min Hee) 21세기정치학회 2015 21세기 정치학회보 Vol.25 No.1
This study aims at identifying the changes in conflict structure in Korean society caused by the evolution of the digital media platform, analyzing the newly arising social and cultural conflict issues with the spread of social media such as Twitter. This study carried out an analysis on the new aspects and issues of social conflicts caused by the evolution of digital media based on a theoretical and historical review of the conflict structure in Korean society. This paper suggested that online social conflict was defined in consideration of its various aspects and complexity, especially online conflict is basically defined as a 'communication conflict'. In this fast changing digital environment, it is ever more important to analyze new social conflicts from a new perspective. In other words, the social conflict paradigm is shifting from 'industrial-type conflict' centered on data inequality to the 'digital conflict' with complex and multilateral structures covering technology, culture and generations. It is expected that the result of this study will contribute to reaching the positive perception of online social conflicts.