2020, Vol.15, No.2

Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

pISSN : 1975-7700 / eISSN : 2734-0570
https://journal.kci.go.kr/kkits

In this paper, we propose a gun-shaped VR haptic controller and an immersive First Person Shooting (FPS) game based on the haptic controller. The proposed VR haptic controller is composed of a bluetooth module for remote communication, a vibration motor for tactile feedback, an inertial measurement unit for motion recognition, a microprocessor, an input button, a battery. The proposed gun-shaped VR haptic controller enables remote communication with virtual environment applications in real-time. Furthermore, the proposed controller generates haptic information and conveys it to user in real-time when he/she shoots a gun in virtual reality game. We inserted two vibrotactile actuators : one is mounted inside the rail cover and the other one is embedded in the vertical handle of the controller in consideration of the position of the user's two hands in order to maximize the haptic effect. In addition, the proposed VR haptic controller has an inertial measurement unit so that the viewpoint of the virtual camera in the game application is changed according to the tilt of the VR haptic controller. In this paper, the objective of virtual haptic game is to kill zombies using the proposed gun-shaped haptic controller. When a character in a virtual game fires a bullet to a zombie, the gun-shaped haptic controller provides a realistic tactile sensation to a user. Therefore, the proposed FPS game is expected to create rich sensations (visual, auditory, and haptic feeling) and to immersively interact with virtual game through a gun-shaped VR haptic controller.

Plants have good effects such as air purification and landscaping, but they have special ingredients to protect themselves. Ingredients made to protect the plant itself can harm people or animals. There are also accidents that are mistaken for other plants with similar plant features. We have implemented a program that can identify plants and display information about each plant. Using deep learning to classify images, we created a web application that predicts plant names and displays information that matches the predicted plants. We created a data set of 61 indoor plants using Google Image Search. The positive effects and negative toxicity of indoor plants are summarized in the database. Deep learning is implemented using fast.ai, a Pytorch-based framework. Through data Augmentation, we increased the number of images to learn. Indoor plant image data were trained using ResNet50, a pretrained model using various images. The accuracy of the model was about 97.5%, which predicted most plants accurately. The web application was implemented using flask, a Python-based web framework. Using the implemented image classification deep learning model, the plant name is predicted and the information corresponding to the predicted plant name is displayed on the web page. The web application can be optimized for mobile devices and used conveniently.

The aim of this study was to investigate the immediate effect of olfactory stimulation using black pepper oil (BPO) combined with sour bolus solution on suprahyoid muscle activation in stroke patients with dysphagia. Twelve stroke patients with dysphagia participated in this study. For all subjects, the suprahyoid muscle activation was measured using surface electromyography (sEMG) during swallowing of four types. Prior to measurement, one of the following four stimulations were applied: odorless+distilled water (ODW), odorless+sour bolus (OSB), black pepper oil+distilled water (BPODW), black pepper oil+sour bolus (BPOSB). The order of swallowing of four types was random, and the subjects swallowed three times for each sensory stimulation, with a rest period of 5 min after finishing each sensory stimulation. Repeated measure ANOVA was used to calculate the mean and maximum values of suprahyoid muscle activation with four sensory stimulations from sEMG. while OSB and BPOSB had a significant effect on mean and maximum values of suprahyoid muscle activation, ODW and BPODW did not have a significant effect (p<.05). The olfactory stimulation using BPO combined with sour bolus solution or sensory stimulation using sour bolus solution may have a positive effect the improvement of suprahyoid muscle strength in stroke patients with dysphagia.