---

This, the 30th issue of the Transactions on Computational Science journal, is comprised of extended versions of selected papers from the International Conference on Cyberworlds, held in Chongqing, China, in September 2016. The first paper is a position paper giving an outline of current research at the intersection of cybersecurity and cyberworlds, and specifically focusing on mining behavioral data from online social networks. The remaining 5 papers focus on a range of topics, including privacy assurance in online location services, human gait recognition using KINECT sensors, hand-gesture recognition for computer games, scene matching between the source image and the target image for virtual reality applications, and human identification using brain waves.

---

Emerging Directions in Virtual Worlds and Biometric Security Research.- KINECT Face Recognition Using Occluded Area Localization Method.- Scene-Aware Style Transferring Using GIST.- Privacy-Preserved Spatial Skyline Queries in Location-Based Services.- Comparison Analysis of Overt and Covert Mental Stimuli of Brain Signal for Person Identification.- The Man-Machine Finger-Guessing Game Based on Cooperation Mechanism.

---