https://pubs.kist.re.kr/handle/123456789/75398 Sun, 26 Apr 2026 12:28:37 GMT 2026-04-26T12:28:37Z https://pubs.kist.re.kr/handle/201004/114334 Title: Single Transmitter based Precise Positioning System using Multiple Antenna: Experimental Test Authors: Kim, O-Jong; Shin, Beomju; Kee, Changdon; Kim, Gapjin; Lee, Taikjin; So, Hyungmin; Kim, Chongwon Abstract: A concept of single transmitter based positioning system, termed as Mosaic system, is that the transmitter generates multi-channel signals and broadcasts using antenna array. The user receives these signals and calculates the position with the time difference of arrivals. This paper describes the experiment results and analyses focusing on the positioning accuracy of Mosaic system. A test configuration for experiments is three-channel pseudolite using L1 (1575.42MHz) carrier. The number of transmitting antennas is also three, and the formation of antennas is regular triangle. Three cases of distances between transmitting antennas are considered: 0.52, 1.52 , and 2.52, where 2 is a wavelength of L1 carrier. Positioning accuracies of static and dynamic users in indoor environment are investigated and analyzed. Additional experiments about the multipath error, one of major error sources in indoor environment, are conducted to analyze the effect by multipath signals. Experiment results describe that even the experiments of Mosaic system are conducted in common office environment, it can achieve decimeter level positioning accuracy. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/114334 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/114333 Title: MIP-VR: An omnidirectional navigation and jumping method for VR shooting game using IMU Authors: Lee, Juyoung; Hwang, Jae-In; Ahn, Sang Chul; Kim, Gerard Jounghyun Abstract: We suggest an omnidirectional navigation and jumping method using walking-in-place (WIP) interface. This method supports forward, backward, sideways walking and jumping include vertical jump. The shooting game is one of the contents that can best take advantage of VR. Since the WIP interface is a hands-free navigation method, it works well with VR shooting game. However, we need to extend WIP because this interface is not possible for sideways walking and jumping that is possible with existing keyboards or joysticks. We propose a forward and sideways walking method suitable for VR shooting game. Our method is inspired by human behavior and using a state diagram to support backward walking, running and vertical jump. We call it motion-in-place (MIP). Our method uses inertial measurement unit (IMU) only. A pilot test of 10 subjects showed that our method is less tiring and useful than a forward-only WIP interface. Our method can be used for most HMDs with built-in IMU and can be suitable for VR shooting game. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/114333 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/114332 Title: Blockchain-based Notarization for Social Media Authors: Song, Gyuwon; Lee, Kwanhoon; Haejin, Hwang; Kim, Suhyun Abstract: This paper presents a blockchain-based notarization service for social media. With the advent of smartphones, social media platforms have become an undeniably popular way to communicate with people across the world. However, fake news and maliciously fabricated screenshots are continuously produced and distributed on social media. Since blockchain technology can store data in a secure and tamper-proof way, it is a suitable platform for notarizing online activity. The problem is how we can verify the data to notarize. We propose an architecture that can authentically archive the contents on social media using blockchain technology. Based on the proposed method, an instant messaging scenario is presented as a proof-of-concept. Tue, 01 Jan 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/114332 2019-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/114331 Title: Are you hearing or listening? The effect of task performance in verbal behavior with smart speaker Authors: Park, Chaewon; Choi, Jongsuk; Sung, Jee Eun; Lim, Yoonseob Abstract: Human has an ability to adjust utterance depending on the state of interlocutor. In this study, we explore the verbal behaviors of human through interaction with two smart speakers that have different level of task competence. We analyzed (1) linguistic behaviors appeared in user's utterance, (2) length of the uttered speech, and (3) required pragmatics skills to understand the user's intent. As a result, there were no significant difference in linguistic behaviors and length of the speech while user interacts with speakers with different task competence. In addition, various pragmatics elements were equally utilized and especially, implied intentions were frequently observed in user's short utterance even under simple interaction scenarios. Fri, 01 Nov 2019 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/114331 2019-11-01T00:00:00Z