• Journal of information and communication convergence engineering
• /
• v.19 no.3
• /
• pp.161-165
• /
• 2021

Since the first commercialization of beacon-based services in 2011, various services have been provided to improve Bluetooth performance, and research has been conducted to accurately recognize user locations using beacons. The various measurement methods of indoor positioning systems (IPS) include methods using receiver signal strength indicator (RSSI) the strength of which varies greatly in accuracy depending on whether there are obstacles such as cement walls or doors. In this paper, we present a method to provide accurate positioning services even in the presence of obstacles in indoor spaces. To this end, we connect the HM-10 module supporting the beacon with Arduino Uno, to place beacons in three directions in real-world indoor space, and derive an optimal trilateration equation. Based on the derivation, we select the optimal expression for calculating the distance between the beacon and the moving station and use it to verify the coordinate determination for the moving station.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.850-851
• /
• 2016

온라인 쇼핑 시장은 모바일기기의 확산과 함께 지속적으로 성장하고 있는 가운데, 소비자는 구매과정에서 온 오프라인 구분 없이 쇼핑하는 옴니쇼퍼로 진화하고 있다. 옴니쇼퍼와 같은 비정형적 소비 패턴에 대응하기 위해서는 고객의 소비행동과 습관 등을 파악한 맞춤형 서비스 제공이 필요하다. 이에 본 논문에서는 고객의 체험적 경험을 극대화 할 수 있는 오프라인 환경에서 제품의 착용 모습을 확인하고 제품 간의 비교화면을 제공하여 제품의 구매의사를 높일 수 있는 스마트 피팅 시스템을 제안하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.848-849
• /
• 2016

스마트폰의 확산과 함께 소비자들의 소비 환경과 행태가 변화하면서 기업은 온라인과 오프라인을 연계하는 O2O 서비스를 제공하고 있다. 기존의 O2O 서비스는 제품 정보를 기반으로 온라인 쇼핑을 제공하고 있으나 온 오프라인 매장 간의 연동에 한계가 있다. 이에 본 논문에서는 온라인 쇼핑몰, 오프라인 매장을 통합하여 상품에 대한 정보 제공과 제품 판매 서비스를 제공하기 위해 스마트 피팅 시스템을 활용한 O2O 연계시스템을 제안한다.

• Journal of information and communication convergence engineering
• /
• v.17 no.3
• /
• pp.198-204
• /
• 2019

In this study, the author introduces a supply-chain management (SCM) solution that connects suppliers, manufacturers, customers, and other companies within a transactional relationship to enable efficient inventory management and timely product supply, which ultimately maximizes corporate profits. This proposed solution exploits Fourth Industrial Revolution technologies, such as artificial intelligence (AI) and the Internet of Things (IoT), which provide solutions to complex management issues generated by the broader market. The goal of the current study was to develop an advanced and intelligent smart SCM solution that complies with logistics standards, to enhance the visibility, safety, and efficiency of a supply chain made up of manufacturers and suppliers. This smart SCM solution aims at maximizing corporate profits through efficient inventory management and timely supply of products, and solves the complex management problems caused by operating within a wide range of markets.

• Journal of information and communication convergence engineering
• /
• v.17 no.3
• /
• pp.205-212
• /
• 2019

Motion tracking and localization devices are an important building block of motion tracking systems in a virtual reality (VR) environment. This study is about improving the accuracy of motion and location for enhancing user immersion in experience type VR environment to position tracking technique. In this study, we propose and test a design of such a device. The module data test of the attitude and heading reference system shows that the implementation with the MPU-9250 sensor is successful and adequate to be used with short operation time. We consider various sensor hardware dependencies of VR, and compare various correction methods and filtering methods to lower the motion to photon (MTP) time that user movement is fully reflected on the display using sensor devices. The Kalman filter is used to combine the accelerometer with the gyroscope in the sensing unit.

• Journal of information and communication convergence engineering
• /
• v.19 no.1
• /
• pp.16-21
• /
• 2021

In this paper, to prevent accidents of school vehicles used by students, which have emerged as a continuous social problem, a boarding and leaving notification system using Bluetooth beacons is proposed. The platform structure uses Bluetooth, a smartphone, and an application, and provides real-time message reception between parents and teachers. It is not simply a system with Bluetooth capability alone, but also an IcT technology that is closely related to real life using two-way communication. The purpose is to provide user-friendly ICT technology as an integrated system for more practical effects. Two-way exchange of information between parents and teachers using cloud servers is made possible. By using this Bluetooth beacon notification system, safety accidents in student vehicles are reduced, which brings confidence from traffic accidents to schoolchildren of parents and teachers. Therefore, it is expected that parents and teachers are expected to improve their mental stability and quality of life from traffic accidents.

• Journal of information and communication convergence engineering
• /
• v.20 no.4
• /
• pp.273-279
• /
• 2022

Owing to the need to establish a cooperative-intelligent transport system (C-ITS) environment in the transportation sector locally and abroad, various research and development efforts such as high-tech road infrastructure, connection technology between road components, and traffic information systems are currently underway. However, the current central control center-oriented information collection and provision service structure and the insufficient road infrastructure limit the realization of the C-ITS, which requires a diversity of traffic information, real-time data, advanced traffic safety management, and transportation convenience services. In this study, a network construction method based on the existing received signal strength indicator (RSSI) selected as a comparison target, and the experimental target and the proposed intelligent edge network compared and analyzed. The result of the analysis showed that the data transmission rate in the intelligent edge network was 97.48%, the data transmission time was 215 ms, and the recovery time of network failure was 49,983 ms.

• 제어로봇시스템학회:학술대회논문집
• /
• 1998.10a
• /
• pp.100-104
• /
• 1998

This paper describes the real-time implementation of an adaptive controller fur the robotic manipulator. Digital signal processors(DSPs) are special purpose micro-processors that are particularly powerful for intensive numerical computations involving sums and products of variables. TMS320C50 chips are used in implementing real time adaptive control algorithms to provide an enhanced motion for robotic manipulators. In the proposed scheme, adaptation laws are derived from the improved Lyapunov second stability analysis based on the direct adaptive control theory. The adaptive controller consists of an adaptive feedforward controller and feedback controller. The proposed control scheme is simple in structure, fast in computation, and suitable for real-time control. Moreover, this scheme does not require any accurate dynamic modeling, nor values of manipulator parameters and payload. Performance of the adaptive controller is illustrated by simulation and experimental results for a assembling robot.

• Journal of Acupuncture Research
• /
• v.31 no.2
• /
• pp.173-182
• /
• 2014

Objectives : There are few reports on treatment of thoracic outlet syndrome in the field of traditional Korean medicine. The aim of this study is to report a case of a 29-year-old male patient diagnosed with thoracic outlet syndrome, whose symptoms were relieved after 3-week integrated Korean medical treatment. Methods : A patient diagnosed with thoracic outlet syndrome was admitted into the Korean medicine hospital. The patient had left shoulder pain and left arm numbness. The pain was worse if it had become cold. The patient was treated using Sa-am acupuncture(Daejangseunggyeok), sweet bee venom acupuncture, herbal medicine and other treatment including physical therapy from September 7th to 27th of 2012. Improvement of the patient's symptoms was evaluated by verbal numerical rating scale(VNRS), skin surface temperature difference between the left and right symmetric part of digital infrared thermographic image(DITI). Results : After 3-weeks of treatment, VNRS decreased and skin surface temperature difference between the left and right symmetric part of DITI showed moderate improvement. Conclusions : The results suggest that integrated Korean medical treatment may affect to reduce the symptoms of thoracic outlet syndrome. Further study is needed to evaluate the importance of this report.

• Journal of Animal Science and Technology
• /
• v.52 no.1
• /
• pp.51-56
• /
• 2010

This study was conducted to clarify the characteristics of Holstein dairy cow's vocalization in postpartum related with calf isolation. Vocalizations of 16 individuals of cows were recorded 6 hours per day (1:00am~4:00am and 1:00pm~4:00pm) using digital recorder and microphone during October 2008 and May 2009. Vocalizations were divided into 4 types. Characteristics of frequency, intensity and duration were analyzed by GLM (general linear model) and Duncan's multi-test. There were significant differences in frequency and intensity based on analyses of spectrogram and spectrum among 4 types of vocalizations. Frequencies of vocalizations were dramatically decreased on 2nd and 3rd day. Vocalization would be important factor affecting the motheryoung bond in Holstein dairy cattle.