http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한재성(Jaesung Han),박기정(Kijung Park) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3
Objective: This study aims to develop a pedestrian safety assessment model for underground parking facilities that comprehensively measure the pedestrian safety level of an underground parking facility. Background: Although underground parking spaces have many potential risks that can cause pedestrian accidents, assessment frameworks that enable to comprehensively measure and monitor the risk levels of underground parking facilities have not been widely discussed in the literature. In this regard, it is necessary to develop a safety assessment framework that can objectively and quantitatively capture the safety level in an underground parking facility. Method: 381 indicators that are associated with general pedestrian safety were extracted from the extant literature first. Then, these indicators were streamlined and standardized based on the importance of each indicator. Finally, a total of ten identified major indicators with sub-indicators and three safety factors categorizing these indicators were derived as a basis of a safety assessment framework. A weighted average scoring system using Analytic Hierarchy Process (AHP) was employed for the indicators measured in a Likert scale and their associated factors to quantify the overall safety level. The proposed framework was applied to a case study of a Korean university. Results: The results showed the overall safety level of the undergraduate parking facility at the university is in a range of "requiring minor treatment". However, the visibility factor had a low safety score, which requires immediate treatment. Based on the assessment results, a sensor system was proposed to improve the safety score of visibility. Conclusion: This study proposed an assessment framework that can objectively measure the safety level of an undergraduate parking space based on multi-criteria for pedestrian safety. The proposed framework can be a useful basis to continuously monitor the progress of underground-parking safety. Application: The proposed framework can be applied to any type of undergroundparking spaces.
Park, Beomjin,Park, Jaesung,Son, Jin Gyeong,Kim, Yong-Jin,Yu, Seong Uk,Park, Hyo Ju,Chae, Dong-Hun,Byun, Jinseok,Jeon, Gumhye,Huh, Sung,Lee, Seoung-Ki,Mishchenko, Artem,Hyun, Seung,Lee, Tae Geol,Han, American Chemical Society 2015 ACS NANO Vol.9 No.8
<P>Precise graphene patterning is of critical importance for tailor-made and sophisticated two-dimensional nanoelectronic and optical devices. However, graphene-based heterostructures have been grown by delicate multistep chemical vapor deposition methods, limiting preparation of versatile heterostructures. Here, we report one-pot synthesis of graphene/amorphous carbon (a-C) heterostructures from a solid source of polystyrene <I>via</I> selective photo-cross-linking process. Graphene is successfully grown from neat polystyrene regions, while patterned cross-linked polystyrene regions turn into a-C because of a large difference in their thermal stability. Since the electrical resistance of a-C is at least 2 orders of magnitude higher than that for graphene, the charge transport in graphene/a-C heterostructure occurs through the graphene region. Measurement of the quantum Hall effect in graphene/a-C lateral heterostructures clearly confirms the reliable quality of graphene and well-defined graphene/a-C interface. The direct synthesis of patterned graphene from polymer pattern could be further exploited to prepare versatile heterostructures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-8/acsnano.5b03037/production/images/medium/nn-2015-03037u_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03037'>ACS Electronic Supporting Info</A></P>
Park, Jaesung,Kwak, Myunghoon,Moon, Kibong,Woo, Jiyong,Lee, Dongwook,Hwang, Hyunsang IEEE 2016 IEEE electron device letters Vol.37 No.12
<P>We propose TiOx-based resistive switching device for neuromorphic synapse applications. This device is capable of 64-levels conductance states because of their optimized interface between the metal electrode and the TiOx film. To compensate the change in switching power with increasing pulse number, we propose the use of fixed voltage and current pulses in potentiation and depression conditions, respectively. By adopting a hybrid pulse scheme, the symmetry of conductance change under both potentiation and depression conditions is shown to be significantly improved. Both the improved conductance levels and the symmetry of conductance change are directly related with enhanced pattern recognition accuracy, which is confirmed by a neural network simulation.</P>