This book constitutes the refereed proceedings of the 19th International Symposium, KSS 2019, held in Tokyo, Japan, in November 2018.The 20 revised full papers presented were carefully reviewed and selected from 54 submissions.

Modeling the heterogeneous mental accounting impacts of inter-shopping duration.- The characteristics of service efficiency and patient flow in heavy load outpatient service system.- How do you reduce waiting time ? - When we talk about medical service, what do we concern? A text analysis of weibo data.- Modeling wicked problems in healthcare using interactive qualitative analysis: the case of patients’ internet usage.- Mining typical drug use patterns based on patient similarity from electronic medical records.- Aiding first incident responders using a decision support system based on live drone feeds.- The use of event-based modeling and system-dynamics modeling in accident and disaster investigation.- Generating risk maps for evolution analysis of societal risk events.- Research on forest fire processing scheme generation method based on belief rule-base.- Kansei knowledge extraction as measure of structural heterogeneity.- The impact of online reviewson product sales: what’s role of supplemental reviews.- Social media and the diffusion of an information technology product.- The effect of cognitive trust on team performance: a deep computational experiment.- Dynamics of deffuant model in activity-driven online social network.- Identifying factors that impact on the learning process of sewing workers on an assembly line.- A study on constructing KM system for laboratories based on the three-stage EDIS spiral.- Some q-rung orthopair fuzzy dual maclaurin symmetric mean operators with their application to multiple criteria decision making.- An improved short pause based voice activity detection using long short-term memory recurrent neural network.