239 research outputs found
Effect of resistive load on the performance of an organic Rankine cycle with a scroll expander
An experimental investigation is performed for an organic Rankine cycle system with different electrical resistive loads. The test rig is set up with a small scroll expander-generator unit, a boiler and a magnetically coupled pump. R134a is used as the working fluid in the system. The experimental results reveal that the resistive load coupled to the scroll expander-generator unit affects the expander performance and power output characteristics. It is found that an optimum pressure ratio exists for the maximum power output. The optimal pressure ratio of the expander decreases markedly as the resistive load gets higher. The optimum pressure ratio of the scroll expander is 3.6 at a rotation speed of 3450 r/min for a resistive load of 18.6 Ω. The maximum electrical power output is 564.5 W and corresponding isentropic and volumetric efficiencies are 78% and 83% respectively
Equivalent Gradient Area Based Fault Interpretation for Transformer Winding Using Binary Morphology
Link-Context Learning for Multimodal LLMs
The ability to learn from context with novel concepts, and deliver
appropriate responses are essential in human conversations. Despite current
Multimodal Large Language Models (MLLMs) and Large Language Models (LLMs) being
trained on mega-scale datasets, recognizing unseen images or understanding
novel concepts in a training-free manner remains a challenge. In-Context
Learning (ICL) explores training-free few-shot learning, where models are
encouraged to ``learn to learn" from limited tasks and generalize to unseen
tasks. In this work, we propose link-context learning (LCL), which emphasizes
"reasoning from cause and effect" to augment the learning capabilities of
MLLMs. LCL goes beyond traditional ICL by explicitly strengthening the causal
relationship between the support set and the query set. By providing
demonstrations with causal links, LCL guides the model to discern not only the
analogy but also the underlying causal associations between data points, which
empowers MLLMs to recognize unseen images and understand novel concepts more
effectively. To facilitate the evaluation of this novel approach, we introduce
the ISEKAI dataset, comprising exclusively of unseen generated image-label
pairs designed for link-context learning. Extensive experiments show that our
LCL-MLLM exhibits strong link-context learning capabilities to novel concepts
over vanilla MLLMs. Code and data will be released at
https://github.com/isekai-portal/Link-Context-Learning.Comment: 10 pages, 8 figure
Towards Mitigating Hallucination in Large Language Models via Self-Reflection
Large language models (LLMs) have shown promise for generative and
knowledge-intensive tasks including question-answering (QA) tasks. However, the
practical deployment still faces challenges, notably the issue of
"hallucination", where models generate plausible-sounding but unfaithful or
nonsensical information. This issue becomes particularly critical in the
medical domain due to the uncommon professional concepts and potential social
risks involved. This paper analyses the phenomenon of hallucination in medical
generative QA systems using widely adopted LLMs and datasets. Our investigation
centers on the identification and comprehension of common problematic answers,
with a specific emphasis on hallucination. To tackle this challenge, we present
an interactive self-reflection methodology that incorporates knowledge
acquisition and answer generation. Through this feedback process, our approach
steadily enhances the factuality, consistency, and entailment of the generated
answers. Consequently, we harness the interactivity and multitasking ability of
LLMs and produce progressively more precise and accurate answers. Experimental
results on both automatic and human evaluation demonstrate the superiority of
our approach in hallucination reduction compared to baselines.Comment: Accepted by the findings of EMNLP 202
Stability and Hopf bifurcation of a ratio-dependent predator-prey model with time delay and stage structure
In this paper, a ratio-dependent predator-prey model described by Holling type II functional response with time delay and stage structure for the prey is investigated. By analyzing the corresponding characteristic equations, the local stability of the coexistence equilibrium of the model is discussed and the existence of Hopf bifurcations at the coexistence equilibrium is established. By using the persistence theory on infinite dimensional systems, it is proven that the system is permanent if the coexistence equilibrium exists. By introducing some new lemmas and the comparison theorem, sufficient conditions are obtained for the global stability of the coexistence equilibrium. Numerical simulations are carried out to illustrate the main results
- …