• Proceedings of the Korean Information Science Society Conference
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• 2010.06a
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• pp.52-53
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• 2010

• Electronics and Telecommunications Trends
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• v.26 no.1
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• pp.99-108
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• 2011

2010년을 전후로 하여 기존 미디어는 보다 강화된 컴퓨팅 기능과 플랫폼 채택, 차세대 네트워킹을 통해 스마트 미디어로 급속한 진화가 전개되고 있다. 스마트 미디어는 스피드, 인텔리전트, 소통과 개방을 통해 이용자에게 보다 편리하고 유용하며 오락적 가치를 제공하고 있으며 기업에는 새로운 비즈니스 기회를 창출하고 있다. 스마트 TV는 스마트 미디어의 핵심 서비스로 부각되고 있으며 멀티 스크린과 스마트 홈을 통해 스마트 IT 기기의 허브가 될 것으로 전망되고 있다. 본 글에서는 국내 전문가와 일반인에 대한 설문조사 결과를 바탕으로 스마트 TV에 대한 수용도를 파악하였으며 잠재 수용자의 프로파일을 분석하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10a
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• pp.237-238
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• 2007

• Proceedings of the Korean Information Science Society Conference
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• 2007.10a
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• pp.239-240
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• 2007

• Electronics and Telecommunications Trends
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• v.19 no.1 s.85
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• pp.33-42
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• 2004

본 고는 가장 최근에 개발된 HDRI 포맷인 OpenEXR 파일 포맷에 대하여 살펴본다. 지금까지 HDRI 포맷으로서 사용되었던 Log Luv TIFF나 Radiance RGBE와 같은 FP 타입의 HDRI 포맷은 압축 방식에 있어서 모두 손실 압축(loss compression)이거나 또는 너무 많은 메모리(32bits FP)를 소비하는 단점이 있었다. 그러나 ILM에 의해서 개발된 EXR 영상 포맷은 16bits FP 데이터 타입에 무손실 압축(lossless compression)을 제공할 뿐만 아니라 유연한 확장성을 제공하고 있기 때문에 앞으로 영상 산업에서의 비주얼 이펙트 표현에 중요한 역할을 할 것으로 기대된다.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.223-224
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• 2015

본 논문에서는 국제 핵융합실험로용 TF 컨버터의 전류제어에 대하여 서술하였다. TF 컨버터는 도넛형 진공용기 내부에 직류 자기장을 발생시켜 플라즈마를 진공용기 내에 가두어 주는 18개의 TF 코일에 전류를 공급한다. 68kA의 직류전류를 17H의 초전도 코일에 공급하기 위해 TF 컨버터는 666V의 계통전원으로 급속 충전 방전의 동작과 333V의 계통전원으로 완속 충전 방전의 동작을 수행한다. 이러한 전류제어 프로파일을 만족하는 TF 컨버터의 전류제어기를 설계하였고, 이를 실제 제어기와 RTDS를 연동하는 HIL 시스템을 구축하여 검증하였다.

• Journal of Korean Society of Environmental Engineers
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• v.29 no.8
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• pp.944-949
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• 2007

The profiles of on-line sensors such as DO, ORP and pH can provide useful information about pollutant removal reaction in sequencing batch reactor. For detection of denitrification completion, the nitrate hee point from ORP profile has been considered as a main indicator of denitrification completion. However, many researchers pointed out that the nitrate knee usually disappeared been the progress of denitrification is so fast and it makes the fault at detection of denitrification completion. In this paper, dynamic time warping(DTW) method and discriminant analysis were used to detect and isolate the profiles of two cases, denitrification completed and uncompleted. As the results, proposed methods can detect state of denitrification successfully.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.12
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• pp.963-967
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• 2009

The Log-structured File System (LFS) collects all modified data into a memory buffer and writes them sequentially to a segment on disk. Therefore, it has the potential to utilize the maximum bandwidth of storage devices where sequential writes are much faster than random writes. However, as disk space is finite, LFS has to conduct cleaning to produce free segments. This cleaning operation is the main reason LFS performance deteriorates when file system utilization is high. To overcome painful cleaning and reduced performance of LFS, we propose the segment space recycling (SSR) scheme that directly writes modified data to invalid areas of the segments and describe the classification method of data and segment to consider locality of reference for optimizing SSR scheme. We implement U-LFS, which employs our segment space recycling scheme in LFS, and experimental results show that SSR scheme increases performance of WOLF by up to 1.9 times in HDD and 1.6 times in SSD when file system utilization is high.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.2
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• pp.247-251
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• 2010

Using SCM in storage systems introduce new potentials for improving I/O performance and reliability. In this paper, we study the use of SCM as a buffer cache that guarantees transactional unit writes. Our proposed method can improve storage system reliability and performance at the same time and can recover the storage system immediately upon a system crash. The Proposed method is based on the LINUX JBD(Journaling Block Device), thus reliability is equivalent to JBD. In our experiments, the file system that adopts our method shows better I/O performance even while guaranteeing high reliability and shows fast file system recovery time (about 0.2 seconds).

• The KIPS Transactions:PartD
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• v.12D no.4 s.100
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• pp.647-656
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• 2005

This paper proposes an adaptive resource self-management system that collects system resources, user information, and usage patterns as context information for utilization in self-configuration. This system ill ease the system maintenance burden on users by automation of large part of configuration tasks such as install, reconfiguration and update, and will also decrease cost and errors. Working from the gathered context information, this system allows users to select appropriate components and install them for user's system context. This also offers a more personalized configuration setting by using user's existing application setting and usage pattern. To avoid the overload on central server to transfer and manage related files, we employ Peer-to-Peer method. h prototype was developed to evaluate the system and a comparison study with the conventional methods of manual configuration and MS-IBM systems was conducted to validate the proposed system in terms of functional capacity, install time and etc.