• Journal of KIISE:Computing Practices and Letters
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• v.8 no.6
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• pp.639-646
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• 2002

In this paper, we discuss the system configuration and the design issues of CATS-i, a set of installation and administration tools for Linux cluster systems. CATS-i enables users to manage cluster systems easily, quickly, and safety. It integrates many functions, ranging from installing operating systems and applications to real-time monitoring and management of various important resources. In addition, batch job submission and management are included. These functions support a single system image. Finally, a powerful graphic user interface based on Java lets users quickly understand the cluster status and conveniently use the CATS-i on the Web.

• ETRI Journal
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• v.19 no.3
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• pp.141-168
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• 1997

The base station (BS) in the CDMA Mobile System (CMS) connects calls through the radio interface and is designed to provide mobile subscribers with high quality service in spite of mobile subscribers motions. The BS consists of multiple base station transceiver subsystems (BTSs), a base station controller (BSC) and a base station manager (BSM). This paper is concerned with the BSC and the BSM. The BSC is located between the BTSs and the mobile switching center (MSC) connected with the public network, and to mobile subscribers via the BTSs. The BSM provides operator-interfaces per the BS and takes responsibility of operation and maintenance (OAM) of the BS. Design of the BSC is based on two module types: functional module and unit module. The functional module is used to support new services easily and the unit module to increase the system capacity economically. Both modular types are easily achieved by inserting the corresponding modules to the system. Particularly, in order to efficiently support the soft handover which is one of CDMA superior advantages, the BSC adopts a large high-speed Packet switch connecting up to 512 BTSs, and thus mobile subscribers can be provided with soft handover in high probability. The BSM is based on a commercial workstation to support OAM functions efficiently and guarantee high reliability of the functions. The BSM uses graphical user interface (GUI) for efficient OAM functions of the BS.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.503-506
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• 2001

In this paper, we describe the implementation of a microphone input level control algorithm and the speech improvement with this level controller in personal computer environment. The volume of speech obtained through a microphone affects the speech recognition rate directly. Therefore, proper input volume level control is desired fur better recognition. We considered some conditions for the successful volume controller implementation firstly, then checked its usefulness on our speech recognition system with common office environment speech database. Cepstral mean subtraction is also utilized far the channel-effect compensation of the database. Our implemented controller achieved approximately 50% reduction, i.e., improvement in speech recognition error rate.

• Information and Communications Magazine
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• v.17 no.3
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• pp.64-73
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• 2000

통신과 컴퓨터 기술의 비약적인 발전게 따른 인터넷의 급속한 확산은 일상적인 상거래를 인터넷 상에서 전자적으로 수행할 수 있도록 하는 전자상거래의 급속한 확장을 가져오고 있다. 전자상거래는 시·공간적인 제약을 받는 기존 상거래를 대체하며 현재 활발히 확산되고 있다. 그러나 인터넷 상의 전자 상거래가 더욱 활성화 되기 위해서는 거래에 대한 인증, 무결성, 기밀성,부인봉쇄 기능을 제공하여 전자거래의 안전성과 신뢰성을 확보해야 한다. 최근 이러한 전자 상거래의 안전성을 제공하기 위해 PKI(Public Key Infrastructure)에 대한 연구가 많이 진행되고 있다. PKI는 공개키 암호 시스템과 공개키에 대한 인증서, 인증기관 등으로 구성되어 전자 거래의 안전성을 제공하는 기반구조로서 많은 응용 분야에서 활용되고 있으며 그 성장 가능성이 매우 크다. 본 고에서는 공개키 기반구조에 대한 개념과 국내외 연구 동향, 그리고 한국전자통신연구원에서 개발한 공개키 기반구조인 ETRI CMS(Certificate Management System)를 설명한다.

• Proceedings of the KSPS conference
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• 2005.04a
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• pp.91-94
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• 2005

The performance of speech recognition is degraded by the mismatch between training and test environments. Many methods have been presented to compensate for additive noise and channel effect in the cepstral domain, and Cepstral Mean Subtraction (CMS) is the representative method among them. Recently, high order cepstral moment normalization method has introduced to improve recognition accuracy. In this paper, we apply high order moment normalization method and smoothing filter for real-time processing. In experiments using Aurora2 DB, we obtained error rate reduction of 49.7% with the proposed algorithm in comparison with baseline system.

• The Journal of Korean Physical Therapy
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• v.16 no.2
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• pp.99-107
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• 2004

The purpose of this study was to investigate the effect of foot orthotic on postural sway. Subjects were 15 patients(7 men and 8 women) who prescribed foot orthotic at B hospital and L rehabilitation medicine clinic in Seoul. Postural sway during a single limb stance was measured using the CMS 10 Measuring System when subjects positioned on the balance trainer under two treatment conditions(orthotic and nonorthotic). RCSP(resting calcaneal stance position) while subjects were standing on the glass plate was measured using the angle finder after subjects were positioned in prone to divide equally lower leg and calcaneus using the goniometer. The result was as follows. There were significant difference between postural sway of orthotic and nonorthotic conditions(t=4.888, 4.589, p<0.001), and the leg of the small RCSP within a subject has the small postural sway index($x^2=26.000$, p<0.001). In conclusion, foot orthotics provide structural support for detecting and controlling postural sway in patients prescribed foot orthotics.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.875-878
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• 2003

최근 무선 인터넷의 발전으로 인하여 통신 환경의 변화가 급속하게 이루어지고 있다. 또한 PDA(Personal Digital Assistant)의 발전 속도가 일반 데스크탑 PC 의 발전 속도를 상회할 정도로 빠르게 성장하고 있으며, 고성능 모바일 CPU 가 사용되면서부터 다양한 주변기기들을 이용하는 형태까지 발전하고 있다. 이러한 무선 인터넷을 활용한 PDA 의 사용으로 보다 빠르고 다양한 정보의 교환을 할 수 있게 되었으며 사용자의 이동성을 보장하는 서비스의 제공이 가능해졌다. 이러한 무선 인터넷을 활용한 서비스는 현재 시행되고 있는 불법 주차 단속시스템에 신속성과 효율성을 부가하는데 적절하게 적용될 수 있다. 본 논문에서는 현재 대중화 되고 있는 PDA 와 무선 인터넷을 이용하여 현장에서 처리되는 불법 주차단속 사항을 주차 관리 중앙센터와 무선으로 연계하여 신속한 견인 및 조치가 이루어 질 수 있는 시스템을 설계 하고자 한다.

• Speech Sciences
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• v.10 no.3
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• pp.263-277
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• 2003

One of major problems in speech recognition is performance degradation due to the mismatch between the training and test environments. Recently, Stereo-based Piecewise LInear Compensation for Environments (SPLICE), which is frame-based bias removal algorithm for cepstral enhancement using stereo training data and noisy speech model as a mixture of Gaussians, was proposed and showed good performance in noisy environments. In this paper, we propose several methods to improve the conventional SPLICE. First we apply Cepstral Mean Subtraction (CMS) as a preprocessor to SPLICE, instead of applying it as a postprocessor. Secondly, to compensate residual distortion after SPLICE processing, two-stage SPLICE is proposed. Thirdly we employ phonetic information for training SPLICE model. According to experiments on the Aurora 2 database, proposed method outperformed the conventional SPLICE and we achieved a 50% decrease in word error rate over the Aurora baseline system.

• Proceedings of the Korea Contents Association Conference
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• 2012.05a
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• pp.170.2-170.2
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• 2012

한국전통식품은 우리나라의 풍토와 생활 습관 속에서 형성된 일상 음식, 궁중 음식, 절기 음식, 대가 음식 등의 풍부한 소재와 조리방식, 건강기능적 우수성에 대한 과학적 근거가 밝혀짐으로서 산업적으로도 차별성과 경쟁력이 있다. 또한 종교, 문화, 역사, 관광. 전기전자, 기계 등 21개 연관 산업이 융합된 분야로서 정부주도하 추진된 한식세계화 사업의 성과가 부진한 이유도 다양한 분야의 콘텐츠를 적절히 활용하거나 접목하지 못한 점이 크다. 따라서 본 연구분야는 식품기술, 식문화 등 융복합콘텐츠 개발과 global Contents Management System(gCMS)과 다매체 연동형 콘텐츠 활용 시스템 구축하기 범정부적 국가차원의 연구이며 한국식품의 세계화 비전을 달성하고 동시에 국가신성장동력 창출에 필수적인 연구사업이다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2411-2413
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• 2003

A new small humanoid robot system is developed in this paper. The humanoid robot has total 20 DOFs : 6 DOFs in each legs, 3 DOFs in each arms, and 2 DOFs in head, 34cms in height, and 2kgs in weight. The robot has the following characteristics: (1) PDA as host controller (2) network-based joint controller (3) wireless camera attached in robot's head (4) mechanism design by CATIA and high speed laser prototyping (5) graphic MMI(Man-Machine Interface) utilizing the CATIA data. By using ADXL inclination sensor, we implement the rope swing with the robot leg motion as well as walking.