• Journal of Broadcast Engineering
• /
• v.10 no.1 s.26
• /
• pp.14-21
• /
• 2005

This paper described an Enhanced-xVSB system for improving mobile/pedestrian reception performance to the ATSC(Advanced Television System Committee) DTV 8-VSB transmission standard. E-xVSB system can transmit a mixture of normal (8-VSB) stream and enhanced (robust) stream. The robust stream has a higher threshold of visibility (TOV) compared to the standard stream, and legacy receivers ignore the robust packets. Thus, Enhanced-xVSB system is fully backward compatible with a current ATSC standard. For mobile and portable reception support, E-xVSB system adopts a reduced constellation methodas well as enhanced trellis-coded modulation scheme. E-xVSB system supports a variety of enhanced modulation schemes : Pseudo-2VSB, Enhanced-4VSB, modified Enhanced-8VSB and Hybrid-VSB. Proposed E-xVSB system performs well under serious dynamic multipath reception environment.

• 제어로봇시스템학회:학술대회논문집
• /
• 2003.10a
• /
• pp.2424-2429
• /
• 2003

The importance of e-Learning, which supports to study anywhere and anytime, has been pointed out for improving education. There have been various research papers on e-Learning system for educations. Most of literatures have focused on guiding the student or measuring understanding their level etc. Design method of e-Learning system has not been discussed based on structure and analysis of the class. In this paper, scheme of the class is proposed by analyzing and structuring class, then design method of e-Learning system is discussed based on it.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.10
• /
• pp.1049-1053
• /
• 2015

This paper proposes to include engine information in Maritime Service Portfolio (MSP) for effective implementation of e-Navigation. Even though engine information is one of most important element to e-Navigation, MSP consists of mainly about navigation and communication information not included engine information. Furthermore, in reality, engine information sent from ship side such as mainly noon report and Planned Maintenance System (PMS) is too limited to make e-Navigation possibly. Therefore, Remote diagnostic structure receiving and sending data of engine information must be included in MSP for implementation of e-Navigation. Also, it has to be designed, and developed by Software Quality Assurance (SQA).

• The Journal of Society for e-Business Studies
• /
• v.7 no.2
• /
• pp.69-81
• /
• 2002

The problem of the previous proprietary e-business systems is that they are not built upon well defined standards, which causes difficulties in extension of the system and interoperation among them. Therefore, a new e-business standard, ebXML, and related XML standards such as SOAP and XML Signature have been recommended for e-business systems. In this paper, as an application of the new XML standards, we design and implement a new internet bidding system. We use XML Schema for defining the document structure of the bidding system. DOM is used for structure search and XSL is used to represent styles. We use SOAP to handle distributed objects and XML Signature to provide data integrity. Due to the adoption of e-business standards, the developed system has advantages in interoperability and extensibility compared to previous systems.

• Journal of the Korea Society of Computer and Information
• /
• v.23 no.12
• /
• pp.107-114
• /
• 2018

We propose EPD(Electrophoretic Display) file generation system based on template that enable users to choose contents layout for E-paper display. And also we show implementation results that apply the proposed system in digital doorsign management field adopting E-paper display. Template includes information for contents layout which is composed of standard form image to be used as background image, coordinates of area for dynamic data to be inserted, data source about dynamic data, and characteristic data of EPD panel for displaying contents. System administrator registers templates in Forms Server. When user chooses a contents layout, Forms Server automatically generates EPD file for displaying contents in E-paper by using information of the template and sends EPD file into doorsign. Strength of the proposed system lies in reflecting user preference about contents design and adding personal data into E-paper contents by smartphone application.

• International Commerce and Information Review
• /
• v.10 no.1
• /
• pp.193-214
• /
• 2008

This study aims to examine similarities and differences of each e-B/L types as well as identify problems of e-B/L utilization and directions for improvement. Especially, it suggests strategies for the realization of e-B/L through reviewing and analyzing commercial types of e-B/L, which have been developed so far. Although e-B/L succeeded in realizing the function as a certificate of title and its distribution value, it has not been fully implemented due to operational problems. Subsequently, e-B/L was realized in the Bolero project as an attempt of system to make up for shortcomings in the failure of previous e-B/L types, but it has still a number of problems. To solve this problem and make use of e-B/L more efficiently, this study focuses on the specific ways to introduce e-B/L and suggest directions for the development of e-Nego system. Preparation of electronic documents is a prerequisite for the development of the e-Nego system, taking distribution of electronic documents into consideration. Next, compatibility of electronic documentation and paper-based documents should be realized, with the guarantee of authenticity of electronic documents.

• International conference on construction engineering and project management
• /
• 2009.05a
• /
• pp.827-834
• /
• 2009

In respond to the demand of an open, fair, transparent, and efficient environment for procurement, many governments have incorporated the use of internet in their procurement systems with online procurement (e-procurement). Given the different policies and laws which have to be complied with, the practice of government e-procurement system varies from one country to another. Thus, experiences in running e-procurement will vary as well. The achievements and obstacles of one country's experience will be a constructive reference for other countries in establishing e-procurement system. In this regard, government e-procurement system practices in two Southeast Asia countries i.e., Thailand and Indonesia particularly in public works are consecutively presented and finally compared in this paper. The government of Thailand has applied Online Auctions (e-Auctions) as the national procurement practice since 2005 and performed the e-Auctions in two types: Reverse Auction and Sealed Bid Auction. Contrary to the common practice of e-procurement, the Thai government, with some rationales, runs the bid documents obtaining manually as well as qualification and technical documents submission and holding the e-Auctions at bidding office. Whereas Indonesian government runs Online Sealed Bid Bidding (e-Procurement) and most of the bidding stages are performed electronically except bid evaluation for both technical and financial. The advantages and drawbacks of these two e-procurement practices are discussed as well as improvements that have to be made for successful of e-procurement.

• Journal of Aerospace System Engineering
• /
• v.15 no.3
• /
• pp.20-29
• /
• 2021

As the feasibility of urban air mobility (UAM) service using electric vertical take-off and landing (eVTOL) aircraft increases due to aircraft electrification, distributed propulsion, and artificial intelligence technologies, the U.S. and European aeronautical societies have been improving their certification system and regulations for the type certification of eVTOL. The improved certification system is expected to be ready in the near future, after the European Union Aviation Safety Agency (EASA) proposed the VTOL Special Condition, SC-VTOL in 2019. However, the current domestic certification system is still insufficient to properly respond to eVTOL. This study investigated the development trends of foreign eVTOL and certification systems, identified considerations to improve the domestic certification system, and proposed the measures for type certificates and type certificates validation of eVTOL based on the comparison between SC-VTOL and Korea airworthiness standards (KAS).

• Proceedings of the KIEE Conference
• /
• 2004.11c
• /
• pp.39-42
• /
• 2004

We have designed a portable electronic nose(e-nose) system using an array of commercial gas sensors for recognition and analyzing the various odours. In this paper, we have implemented a portable e-nose system using an array gas sensors and personal digital assistants(PDA) for recognizing and analyzing volatile organic compounds(VOCs) in the field. Field screening for pollutants has been a target of instrumental development for number of year. A portable e-nose system can be substantial benefit to rapidly localize the spacial extent of a pollution or to find pollutants source. And, by using PDA, E-nose have a better function such as the easy user-interface and data transfer by internet from on- site to remote computer. We adapted the Levenberg-Marquardt algorithm based on the back-propagation and proposed the method that could be predicted concentration levels of VOCs gases after classification by separating neural network into two parts.

• Journal of Korean Institute of Industrial Engineers
• /
• v.39 no.2
• /
• pp.135-142
• /
• 2013

In B2B e-Marketplace for free gifts and goods, product-mix recommendation is provided frequently by analysing customer logs and/or performing collaborative and rules-based filtering. This study proposes a new process that encompasses the genetic algorithm and key working processes of B2B e-marketplace based on the previous cooperate client order data. Efficiency and accuracy of the proposed system have been confirmed by cross-confirmation of accumulated data in the e-marketplace. The system can provide better opportunities for manufactures and suppliers to select optimized product-mix without time consuming trials and errors in their B2B e-marketplace networks.