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Now showing items 1 - 12 of 12


    Various embodiments of the present invention relate to a flexible electronic device. The flexible electronic device may comprise: a flexible display; a first housing and a second housing to which the flexible display is coupled; a multi-joint hinge for connecting the first housing and the second housing to allow the electronic device to be folded; a flexible cover for covering at least a portion of the first housing, the multi-joint hinge, and at least a portion of the second housing; and a shape preservation unit for holding an appearance session of the electronic device, is the shape preservation unit which is located between the multi-joint hinge and the flexible cover. In addition, various embodiments based on the technical idea of the present invention are available.
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  • Securing design checking service for the regulation-based product design

    Kim, Ikjune   Lee, Jaechul   Mun, Duhwan   Jun, Hongbae   Hwang, Jinsang   Kim, Jeong Tae   Han, Soonhung  

    When designing a product, a designer has to follow regulations involved in all phases of product lifecycle. However, it may be practically impossible for a designer to be well-acquainted with all the regulations related to a product. Therefore, from the viewpoint of a company's competitiveness, it is important to provide a tool which automatically checks design results of a product in accordance with the regulations involved. Outsourcing a design checking service instead of in-house development can be an appropriate choice, considering facilities, human resources, and cost required for developing and managing design checking tools. In this paper, the authors suggest a method to prevent the leak of intellectual property, which may occur when providing design checking services. This work also discusses necessary data exchanged between a design checking service provider and a manufacturer. Furthermore, this work details design checking service procedure and system architecture of a design checking service. (C) 2012 Elsevier B.V. All rights reserved.
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  • A New Window-Based Program for Quality Control of GPS Sensing Data

    Lee, Dongha   Cho, Jaemyoung   Suh, Yongcheol   Hwang, Jinsang   Yun, Hongsik  

    The main purpose of this study is to develop a new Windows-based program that calculates a quality control parameter that shows the quality of Global Positioning System (GPS) observations using GPS data in a Receiver INdependent Exchange (RINEX) format. This new program, Global Positioning System Quality Control (GPSQC), allows general GPS users to easily and intuitively check the quality of GPS observations before post-processing, which will lead to the improvement of GPS positioning precision in diverse areas of GPS applications. The GPSQC is designed to control the multi-path, cycle slip, and ionospheric errors of L-1 and L-2 signals in GPS observations. The GPSQC was developed using C#.NET language for the Window series with Microsoft Graphical User Interfaces (MS GUIs). This program gives brief information for GPS observations, time series plots, graphs of quality control parameters, and a summary report in MS word, Excel and PDF formats. It can simply perform quality checking of GPS observations that is difficult for surveyors conducting field work. We expect that GPSQC can be used to improve the accuracy of positioning and to solve time-consuming problems due to data loss and large errors in GPS observations.
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  • A Static Displacement Monitoring System for VLBI Antenna Using Close-Range Photogrammetry

    Kim, Hyukgil   Yun, Hongsik   Hwang, Jinsang   Hong, Sungnam  

    In this study, a static displacement monitoring program was developed to maintain the accurate performance of a Very Long Baseline Interferometry (VLBI) antenna by monitoring its structural stability. The monitoring program was designed to measure static displacement, among the many displacements of the antenna's main reflector, which can directly affect its performance. The program measures the position of a monitored object with mm-level accuracy through close-range photogrammetry that uses high-resolution Charge Coupled Device (CCD) cameras. The developed program will be used to evaluate the structural soundness of an antenna based on continuous displacement measurements, which can also be used as basic data for repair and reinforcement work in the future.
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  • A Study on Estimating the Next Failure Time of Compressor Equipment in an Offshore Plant

    Cho, SangJe   Shin, Jong-Ho   Jun, Hong-Bae   Hwang, Ho-Jin   Ha, Chunghun   Hwang, Jinsang  

    The offshore plant equipment usually has a long life cycle. During its O&M (Operation and Maintenance) phase, since the accidental occurrence of offshore plant equipment causes catastrophic damage, it is necessary to make more efforts for managing critical offshore equipment. Nowadays, due to the emerging ICTs (Information Communication Technologies), it is possible to send health monitoring information to administrator of an offshore plant, which leads to much concern on CBM (Condition-Based Maintenance). This study introduces three approaches for predicting the next failure time of offshore plant equipment (gas compressor) with case studies, which are based on finite state continuous time-Markov model, linear regression method, and their hybrid model.
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  • Optimal Methods of RTK-GPS/Accelerometer Integration to Monitor the Displacement of Structures

    Hwang, Jinsang   Yun, Hongsik   Park, Sun-Kyu   Lee, Dongha   Hong, Sungnam  

    The accurate measurement of diverse displacements of structures is an important index for the evaluation of a structure's safety. In this study, a comparative analysis was conducted to determine the integrated RTK-GPS/accelerometer method that can provide the most precise structure displacement measurements. For this purpose, three methods of calculating the dynamic displacements from the acceleration data were comparatively analyzed. In addition, two methods of determining dynamic, static, and quasi-static displacements by integrating the displacements measured from the RTK-GPS system and the accelerometer were also comparatively analyzed. To ensure precise comparison results, a cantilever beam was manufactured onto which diverse types of displacements were generated to evaluate the measurement accuracy by method. Linear variable differential transformer (LVDT) measurements were used as references for the evaluation to ensure accuracy. The study results showed that the most suitable method of measuring the dynamic displacement with the accelerometer was to calculate the displacement by filtering and double-integrating the acceleration data using the FIR band-pass filter. The integration method that uses frequency-based displacement extraction was most appropriate for the integrated RTK-GPS/accelerometer method of comprehensively measuring the dynamic, static, and quasi-static displacements.
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  • Protection of intellectual property based on a skeleton model in product design collaboration

    Mun, Duhwan   Hwang, Jinsang   Han, Soonhung  

    As markets are globalized and competition among companies increases, corporations strive to remain competitive by focusing their abilities on key parts of a new product, while outsourcing remaining parts to other companies. In these circumstances, relationships with business partners with regard to product design are not rigid and vertical, but rather, flexible and horizontal; thus, partners today can be competitors in the future. Therefore, the intellectual property of a participating company should be protected from other collaborating companies during the product design process. However, this safeguard should not be an obstacle to product design collaboration itself As a solution to this problem, we propose a method to share a skeleton model among collaborating companies. By using this model, participating companies can share essential data required for the detail design of those components of a product for which they are responsible, while ensuring security of their intellectual property. The feasibility of the proposed method has been demonstrated through experiments in a development scenario involving a tub component of a washing machine. (C) 2009 Elsevier Ltd. All rights reserved.
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  • Frequent Unscheduled Updates of the National Base Map Using the Land-Based Mobile Mapping System

    Hwang, Jinsang   Yun, Hongsik   Jeong, Taejun   Suh, Yongcheol   Huang, He  

    This paper focuses on the use of the Land-based Mobile Mapping System (LMMS) for the unscheduled updates of a National Base Map, which has nationwide coverage and was made using aerial photogrammetry. The objectives of this research are to improve the weak points of LMMS surveying for its application to the updates of a National Base Map (NBM), which has rigorous accuracy and quality standards. For this, methods were suggested for the (1) improvement of the accuracy of the Global Positioning System/ Inertial Navigation System (GPS/INS) in the long-term exposure of environments with poor GPS reception; (2) elimination of mutual deviations between LMMS data obtained in duplicate to meet resolution standards; (3) devising an effective way of mapping objects using LMMS data; and (4) analysis of updatable regions and map layers via LMMS. To verify the suggested methods, experiments and analyses were conducted using two LMMS devices in four target areas for unscheduled updates of the National Base Map.
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  • Development of an RTK-GPS Positioning Application with an Improved Position Error Model for Smartphones

    Hwang, Jinsang   Yun, Hongsik   Suh, Yongcheol   Cho, Jeongho   Lee, Dongha  

    This study developed a smartphone application that provides wireless communication, NRTIP client, and RTK processing features, and which can simplify the Network RTK-GPS system while reducing the required cost. A determination method for an error model in Network RTK measurements was proposed, considering both random and autocorrelation errors, to accurately calculate the coordinates measured by the application using state estimation filters. The performance evaluation of the developed application showed that it could perform high-precision real-time positioning, within several centimeters of error range at a frequency of 20 Hz. A Kalman Filter was applied to the coordinates measured from the application, to evaluate the appropriateness of the determination method for an error model, as proposed in this study. The results were more accurate, compared with those of the existing error model, which only considered the random error.
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  • Development of Soil Compaction Analysis Software (SCAN) Integrating a Low Cost GPS Receiver and Compactometer

    Hwang, Jinsang   Yun, Hongsik   Kim, Juhyong   Suh, Yongcheol   Hong, Sungnam   Lee, Dongha  

    A software for soil compaction analysis (SCAN) has been developed for evaluating the compaction states using the data from the GPS as well as a compactometer attached on the roller. The SCAN is distinguished from other previous software for intelligent compaction (IC) in that it can use the results from various types of GPS positioning methods, and it also has an optimal structure for remotely managing the large amounts of data gathered from numerous rollers. For this, several methods were developed: (1) improving the accuracy of low cost GPS receiver's positioning results; (2) modeling the trajectory of a moving roller using a GPS receiver's results and linking it with the data from the compactometer; and (3) extracting the information regarding the compaction states of the ground from the modeled trajectory, using spatial analysis methods. The SCAN was verified throughout various field compaction tests, and it has been confirmed that it can be a very effective tool in evaluating field compaction states.
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  • Sharing product data of nuclear power plants across their lifecycles by utilizing a neutral model RID C-2030-2011

    Mun, Duhwan   Hwang, Jinsang   Han, Soonhung   Seki, Hiroshi   Yang, Jeongsam  

    Many public and private Korean organizations are involved during the lifecycle of a domestic nuclear power plant. Korea Plant Engineering Co. (KOPEC) participates in the design stage, Korea Hydraulic and Nuclear Power (KHNP) operates and manages all nuclear power plants in Korea, Doosan Heavy Industry and Construction Co. manufactures the main equipment, and a construction company constructs the plant. Even though each organization has its own digital data management system and obtains a certain level of automation, data sharing among organizations is poor. KHNP obtains drawings and technical specifications from KOPEC in the form of paper. This results in manual re-work of definitions, and errors can potentially occur in the process. In order to establish an information bridge between design and operation and maintenance (O&M) phases, a generic product model (GPM), a data model from Hitachi, is extended for constructing a neutral data warehouse and the Korean Nuclear Power Plant Information Sharing System (KNPISS) is implemented. (C) 2007 Elsevier Ltd. All rights reserved.
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  • [IEEE 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Lyon, France (2007.08.22-2007.08.26)] 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - "The World First Intelligent Oral Hygiene Guiding System": Designed for Manual Tooth Brushing Education and Compliance

    Hwang, Jinsang  

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