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Solving Survival Gridworld Problem Using Hybrid Policy Modified Q-Based Reinforcement
Vince Jebryl Montero,Woo-Young Jung,Yong-Jin Jeong 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.4
This paper explores a model-free value-based approach for solving survival gridworld problem. Survival gridworld problem opens up a challenge involving taking risks to gain better rewards. Classic value-based approach in model-free reinforcement learning assumes minimal risk decisions. The proposed method involves a hybrid on-policy and off-policy updates to experience roll-outs using a modified Q-based update equation that introduces a parametric linear rectifier and motivational discount. The significance of this approach is it allows model-free training of agents that take into account risk factors and motivated exploration to gain better path decisions. Experimentations suggest that the proposed method achieved better exploration and path selection resulting to higher episode scores than classic off-policy and on-policy Q-based updates.
Competition of Hub Ports: A Comparison between Europe and the Far East
( Vince F. Valentine ),( R. Gray ) 한국해운물류학회 (구 한국해운학회) 2002 해운물류연구 Vol.35 No.-
Competition between ports can be said to be at an unparalleled stage in its evolution from the small port of pre-industrialisation serving a local community to the present day hub ports serving many countries perhaps hundreds of miles apart. Ports are by their very nature immovable objects that require advanced planning sometimes decades ahead. It is therefore not surprising that port efficiency ranks high amongst stakeholders` main priorities. Thus with the increase competition also comes an increase in the need to calculate port efficiency. Numerous studies have been conducted on port efficiency, some made using the assessment of productivity based upon output per worker (De Monie 1987). output per wharf (Frankel 1991) whilst others use production functions (Kim & Sachis 1986 & De-Neufville and Tsunokawa 1981). This paper will use a technique known as Data Envelopment Analysis (DEA) to calculate the relative efficiency of container ports using output by size of the port. Martinez-Budria et al (1999) and Tongzon (2001) conducted research using DEA on Spanish and Australian ports respectively. This paper will focus on the regions of Europe and the Far East, comparing efficiency with organisational structure, ownership and location factors.
Far from Distant Shores: Identity Limbo in the Korean Diaspora (Artist's Statement)
Michael Vince Kim 고려대학교 민족문화연구원 2018 Cross-Currents Vol.0 No.29
Note: This essay accompanies the photo essay of the same title, which can be accessed by clicking on the thumbnail images to the right of the text.
Solving Survival Gridworld Problem Using Hybrid Policy Modified Q-Based Reinforcement
Montero, Vince Jebryl,Jung, Woo-Young,Jeong, Yong-Jin Institute of Korean Electrical and Electronics Eng 2019 전기전자학회논문지 Vol.23 No.4
This paper explores a model-free value-based approach for solving survival gridworld problem. Survival gridworld problem opens up a challenge involving taking risks to gain better rewards. Classic value-based approach in model-free reinforcement learning assumes minimal risk decisions. The proposed method involves a hybrid on-policy and off-policy updates to experience roll-outs using a modified Q-based update equation that introduces a parametric linear rectifier and motivational discount. The significance of this approach is it allows model-free training of agents that take into account risk factors and motivated exploration to gain better path decisions. Experimentations suggest that the proposed method achieved better exploration and path selection resulting to higher episode scores than classic off-policy and on-policy Q-based updates.
다른 것과 만나기: 즉흥적 다문화 음악 연주에서 창조적인 것 진행하기
로버트빈크스 ( Robert Vincs ) 세계음악학회 2016 음악과 문화 Vol.35 No.-
에포케 1996년 한 친구가 샌프란시스코를 주 무대로 활동하는 국제적인 음악인과의 만남에 나를 데리고 간 적이 있다. 내가 만난 사람은 이미 여러 세계적인 음악인들과 연주를 함께 한 경험이 있는 명연주자 중 하나였고, 솔직히 말해서, 그가 나와 함께 연주를 해 준 것은 아마도 내 친구와의 인연을 생각해 예의상 한 것이리라. 그와 나의 처음 대화는 겉돌았고 형식적이었다. 이내 말 할거리가 바닥나자 우리는 그의 작업실로 가서 즉흥연주를 함께 하기 시작했다. 몇 시간을 쉬지 않고 함께 연주한후에 우리는 오랫동안 알고 지내온 사이처럼 진한 우정을 느끼게 되었다.
Jesús C. Peña-Vinces,Segundo Castro,Francisco Espasandín-Bustelo 한국유통과학회 2013 유통과학연구 Vol.11 No.4
Purpose - The aim of this work is to study the reorientation that the export industrial sectors in Costa Rica have experienced during the last 20 years. Research design, data, methodology - The study employs the Cluster Analysis with the export data (20 years of cut-off period) from Costa Rica to the U.S-market. To make the predictions, the technique of the time series was used, with official data (from 2001 to 2010) from the U.S. Department of Commerce and the U.S. International Trade Commission. Results - The Cluster Analysis, show how the economic sectors of traditional products exports of Costa Rica have progressively become in exporters of non-traditional products, meanwhile,the time series confirms that this trend will continue, at least during the next five years. Conclusions - The industry of traditional products exports of Costa Rica (dressmaking, vegetables, coffee, mate, species, etc.) will progressively become in exporters of non- traditional products with a high-tech component (i.e., mechanical equipment and devices, electronic devices and medical equipment),as a consequence of the Chinese (Costa Rica’s main competitor) economy´s presence in the Organization for Economic Co-operation and Development (OCDE). This fact has enabled the potential improvement of Costa Rica’s international competitiveness in the U.S. market.