  This paper describes our submission for the SemEval 2018 Task 7 shared task
on semantic relation extraction and classification in scientific papers. We
extend the end-to-end relation extraction model of (Miwa and Bansal) with
enhancements such as a character-level encoding attention mechanism on
selecting pretrained concept candidate embeddings. Our official submission
ranked the second in relation classification task (Subtask 1.1 and Subtask 2
Senerio 2), and the first in the relation extraction task (Subtask 2 Scenario
1).
