494 research outputs found
The Structure and Activities of Inter-organizational Knowledge Sharing Chain and Network
The present article aims to provide a theoretical foundation for the evaluation and categorization of the knowledge domain of Chain and Network Science (CNS). It aims to clarify what the field of CNS includes and to investigate where we stand in developing CNS. It elaborates on a number of important theories that provide insight in the structure and activities of actors in chains and networks, and discusses the key issues that are raised by each theory. It concludes by suggesting some important research questions in the field of CNS, integrating the different theoretical perspectives, and touching upon a number of management challenges for the years to come
Dynamic Analysis and Control of the Clutch Filling Process in Clutch-to-Clutch Transmissions
Clutch fill control in clutch-to-clutch transmissions influences shift quality considerably. An oncoming clutch should be applied synchronously with the release of an offgoing clutch to shift gear smoothly; therefore, the gap between the piston and clutch plates should be eliminated when the torque capacity is near zero at the end of the clutch fill phase. Open-loop control is typically implemented for the clutch fill because of the cost of pressure sensor. Low control precision causes underfill or overfill to occur, deteriorating shift quality. In this paper, a mathematical model of an electrohydraulic clutch shift control system is presented. Special dynamic characteristic parameters for optimal clutch fill control are subsequently proposed. An automatic method for predicting initial fill control parameters is proposed to eliminate distinct discrepancies among transmissions caused by manufacturing or assembling errors. To prevent underfill and overfill, a fuzzy adaptive control method is proposed, in which clutch fill control parameters are adjusted self-adaptively and continually. Road vehicle test results proved that applying the fuzzy adaptive method ensures the consistency of shift quality even after the transmission’s status is changed
Contrastive Learning enhanced Author-Style Headline Generation
Headline generation is a task of generating an appropriate headline for a
given article, which can be further used for machine-aided writing or enhancing
the click-through ratio. Current works only use the article itself in the
generation, but have not taken the writing style of headlines into
consideration. In this paper, we propose a novel Seq2Seq model called CLH3G
(Contrastive Learning enhanced Historical Headlines based Headline Generation)
which can use the historical headlines of the articles that the author wrote in
the past to improve the headline generation of current articles. By taking
historical headlines into account, we can integrate the stylistic features of
the author into our model, and generate a headline not only appropriate for the
article, but also consistent with the author's style. In order to efficiently
learn the stylistic features of the author, we further introduce a contrastive
learning based auxiliary task for the encoder of our model. Besides, we propose
two methods to use the learned stylistic features to guide both the pointer and
the decoder during the generation. Experimental results show that historical
headlines of the same user can improve the headline generation significantly,
and both the contrastive learning module and the two style features fusion
methods can further boost the performance.Comment: Accepted at EMNLP 202
Multi-Scale Self-Attention for Text Classification
In this paper, we introduce the prior knowledge, multi-scale structure, into
self-attention modules. We propose a Multi-Scale Transformer which uses
multi-scale multi-head self-attention to capture features from different
scales. Based on the linguistic perspective and the analysis of pre-trained
Transformer (BERT) on a huge corpus, we further design a strategy to control
the scale distribution for each layer. Results of three different kinds of
tasks (21 datasets) show our Multi-Scale Transformer outperforms the standard
Transformer consistently and significantly on small and moderate size datasets.Comment: Accepted in AAAI202
Characteristics of the Tan-Lu Strike-Slip Fault and Its Controls on Hydrocarbon Accumulation in the Liaodong Bay Sub-Basin, Bohai Bay Basin, China
The Tan-Lu Fault, one of the major strike-slip structures in China, controlled the development of most of the Meso-Cenozoic NNE trend rifted petroliferous basins in east China. It has cut across the Bohai Bay Basin since the late Cenozoic and played an important role in hydrocarbon accumulation and distribution in the Liaodong Bay sub-basin of the Bohai Bay Basin. The purpose of this paper is to study the geometry of the Tan-Lu strike-slip and how it affected petroleum system development in the Liaodong Bay sub-basin. The innovative seismic interpretation revealed the western branch of the Tan-Lu strike-slip fault cut through the Liaozhong depression of the sub-basin and its eastern branch superimposed on the earlier extensional boundary fault of the sub-basin. The strike-slip movement is characterized by a distinctive strike-slip zone associated with the NE en echelon faults in the central part of the Liaozhong depression and also caused the formation of the Liaodong uplift and the Liaodong depression in the east Liaodong Bay Sub-basin. Rapid movement of the Tan-Lu strike-slip fault has deepened the Liaozhong depression and facilitated the maturation of source rock. Related fault movement formed a series of structural traps and paleotopographic highs and lows that subsequently controlled sediment dispersal and the distribution of stratigraphic-related traps within sequence stratigraphic framework. Exploration practice, geochemical study and petroleum system modeling demonstrate that the Tan-Lu strike-slip and its associated faults acted as good hydrocarbon migration pathways and hydrocarbon accumulated in many traps associated with the Tan-Lu strike-slip zone. Many recent discoveries along the strike-slip zone prove that the petroleum system in Liaodong Bay Sub-basin was mainly controlled by the activity of the Tan-Lu strike-slip. The resulting hydrocarbon accumulation model in this sub-basin may provide a paradigm for the prediction of hydrocarbon accumulation to other east China basins along the Tan-Lu strike-slip fault zone. Key words: Liaodong Bay Sub-basin; Tan-Lu strike-slip fault; Hydrocarbon accumulation; Petroleum system; Sequence stratigraph
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