• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.198-201
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• 2003

Changes in internet and network environment make it possible to provide high-quality content services in real time. As demand for digital content is increased, problems related to intellectual property rights are getting more important. Streaming service like video-on-demand solved this problem by preventing content from being saved. But, as the advent of several tools able to save streamed content, the streamed content is not free from these problems any more. So, with security countermeasure like access control, new technologies to control and manage rights for content are needed. One of the solutions is DRM In this paper, we describe a DRM-based streaming service that can send the ASF stream which is the multimedia file format of Microsoft.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.8A
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• pp.1245-1251
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• 1999

A 1.25Gb/s path control switch chip has been designed and implemented with COMPASS tool and 0.8${\mu}{\textrm}{m}$ CMOS gate-array of LG semiconductor. This device controls the path of digital singnals in SDH-based transmission system. The proposed switch chip is suitable for self-healing operations both in a linear network and an unidirectonal ring, The self-healing operation of the switch is effectively done by the configuration information stored in the resisters of the switch. The test device adapted to SDH-based transmission system, show immediate restoration and a 10-11~10-12 bit error raito. And 2.5Gb/s or more high throughput can be realized by combining rwo identical or more switches with the parallel architecture.

• Journal of Digital Contents Society
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• v.5 no.2
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• pp.106-113
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• 2004

Once the objective of project is set up to alter the present situation to acertain future situation necessary measures need to be taken to accomplish it. In the past, making a plan and transformation was done in the form of handwork, but this article addresses analyzing and handing the project data by using a tool of Microsoft Office System and then by making a reasonable plan. This system also helps transform project data into Excel data and analyze it using Excel, and transform project data into xml data and construct xml database so that it makes it possible to handle and use data efficiently, and to set up automatic project system in the future which leads to efficient project management.

• Journal of Digital Contents Society
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• v.9 no.4
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• pp.717-723
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• 2008

Many of the domestic PC manufactures and professional PC repair shops are suffering from lack of efficient diagnostic database systems or CAD tools for diagnosis and repair of PCs. In order to solve this problem, a new diagnostic database system for PC maintenance and repair is presented in this paper. We can perform accurate and rapid diagnosis for the PCs with software and hardware troubles by using proposed database system and thus the number of customers who are satisfied with service results are to be increased. Furthermore our research outputs make it possible the experts in PC repair field accumulate maintenance techniques and enhance the reliability of performance evaluated by customers.

• Journal of the Korea Institute of Military Science and Technology
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• v.20 no.3
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• pp.431-440
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• 2017

HF communications are used as a last means of long distance communications without any relay node in NLOS (Non Line-Of-Sight) environment. Conventional analog voice communication in the HF band is vulnerable to security as well as severe background noise. To overcome these shortcoming, digital voice was introduced into HF radios in the early 1980s. In this paper, we analyze avaliable digital voice communication ground wave range of HF radios that applied MELPe CODEC and MIL-STD-188-110B physical layer standard using GRWAVE program. And we evaluate usefulness of digital voice communication in HF band.

• Journal of Korea Society of Digital Industry and Information Management
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• v.8 no.4
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• pp.185-192
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• 2012

It is the concept of this paper to build up the convergence type of the total class service system, and the goal is to develop the education services, which are differentiated from existing digital textbooks and development tools. We establish developmental programs and convergence strategies from market analyses related to apps and digital education. Then this paper proposes 'E-Class Author Service System (ECA)' as an education service system based on the tablet PC. It is the convergence system of the app type of textbook development tool and class management system. Teachers can produce and develop class materials and textbooks using the app type of textbook development tool in ECA service system. They can also add necessary functions from the class management system for efficient class progress. ECA improves the interaction and communication between a teacher, student and parents in the sever-based network. This study expects that ECA will achieve prior occupation of the app market as an educational app development tool and reduce private education expenses.

• Journal of The Korean Digital Architecture Interior Association
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• v.12 no.2
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• pp.25-32
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• 2012

환경디자인은 건축, 도시, 조경 등 서로 다른 분야의 전문가 및 대상 지역 거주하는 일반시민 등 많은 참여자를 가지는 특징이 있다. 이러한 협조설계 단계에서는, 시행착오를 최소화시키기 위해서 디자인 초기단계에서부터 각 분야의 전문가들이 계획에 관해서 협의하여 디자인 내용을 변경해 나갈 필요가 있다. 또한 대상지 지역을 누구보다 잘 이해하고 있으며 계획 후 이 지역에 살게 될 주민들의 참여도 환경디자인 단계에서 고려해야 할 중요한 요소 중 하나이다. 여러 분야의 전문가 또는 비전문가들이 서로 커뮤니케이션하고 협조하기 위해서는 누구나가 쉽게 디자인 내용을 이해 할 수 있는 커뮤니케이션 툴이 필요하다. 이러한 필요성을 만족시키기 위해서는 빠른 구축속도, 대화형 기능, 빠른 표현속도, 사실적인 표현기술 등이 필수 조건이라고 할 수 있다. 본 연구에서는 이러한 환경디자인 분야의 전 분야에서 의사결정을 지원하고 디자인 안을 검토할 수 있는 3D CG 시스템을 개발하고 이 시스템을 실제 프로젝트에 적용시켜서 활용하면서 개발된 시스템의 기능강화를 추진하며, 실제 프로젝트 적용을 통한 시스템의 평가를 진행하여 본 연구에서 개발한 시스템의 유용성을 증명하는 것을 본 연구의 목표로 한다.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.6
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• pp.512-518
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• 2003

Position controls are very important in semiconductor manufacturing devices, machine tools Precision measuring instruments, etc. To measure the distance of movement of moving objects in minute units and the accuracy of measurement for the moving distance in these devices affect the performance of the whole devices. Therefore, in those Precision instruments, a sensing device that can measure the distance of movement with high-precision resolution is required. In this paper, a novel encoder of digital and analog hybrid type is proposed. It is shown that from this experiment a high-resolution angle measurement device can be designed by a low cost incremental encoder.

• Journal of Korea Society of Digital Industry and Information Management
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• v.18 no.4
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• pp.77-83
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• 2022

As users' needs for customized services increase, the service provision method is changing from a vertical structural service provision method to a horizontal structural service provision method. This paradigm shift has led to a change from the way existing users find the content they want to find and provide customized needs of users by content providers. With the recent development of smartphones and various AI technologies, demand for providing seamless services such as smartphones is increasing in automobiles. However, it is difficult to provide services in line with changes in this service paradigm because automobile services provide services centered on finished car manufacturers rather than individually providing services tailored to user needs. In this paper, we develop a Node-RED-based dynamic vehicle service simulation tool so that users can use the service they want in cars. The simulation tool developed provides a simulation environment for services authored by the user using NodeRed by writing, registering, and using NodeRed.

• Journal of Convergence for Information Technology
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• v.10 no.9
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• pp.1-7
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• 2020

In order to implement a smart factory for manufacturing innovation, more digital twins will be developed and applied gradually. In particular, simulation and optimization of digital twins makes it possible to support critical decision-making like a predictive maintenance of the equipment for manufacturing. In terms of a user perspective, this study suggests the conceptual framework of Digital Twin Management System (DTMS) for supporting the analytical and managerial activities for Digital Twins. We integrate the methods and structure of the area like Manufacturing Engineering, Decision Support Systems, and Optimization for developing the DTMS. The framework suggested in this study shows a typical DSS which consists of dialog management system, model management system and data management system. It also includes Analytical Digital Twins and simulations & optimization module. The framework is being applied in one of the most competitive and complex industrial sector. Also this study is meaningful to suggest a new direction of research.