• 소성∙가공
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• 제11권7호
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• pp.608-613
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• 2002

An ultrasonic machining process is efficient and economical means for precision machining of glass and ceramic materials. However, the mechanism of the process with respect to the crack initiation and propagation and the stress development in the ceramic workpiece subsurface arc still not well understood. In this research, we have investigated the basic mechanism of ultrasonic machining of ultrasonic machining of glass by the experimental approach. For this purpose, we designed and fabricated the desktop micro ultrasonic machine. The feed is controlled precisely by using the constant load control system. During machining experiments, the effects of abrasive characteristics and machining conditions on the surface roughness and the material removal rate are measured and compared.

• 대한의용생체공학회:의공학회지
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• 제22권4호
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• pp.377-383
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• 2001

In this paper, we present an intensive patient monitoring service through the Internet, which enables medical doctors to watch their patients in a remote site, to monitor their vital signs and to give them some advices for first-aid treatment. The service consists of three service objects: Monitoring Information Service(MIS), Vital Sign Monitoring Service(VSMS) and Multimedia Consulting (MCS). Through the MIS, medical doctors can get information about the patients currently under monitoring, including their names, ages, genders, symptoms, current main complaints and current locations. The VSMS enables medical doctors to monitor in real-time patients' vital signs such as electrocardiogram (ECG), respiration, temperature, blood oxygen saturation (SpO$_{2}$), invasive blood pressure (IBP), and non-invasive blood pressure (NIBP). It also generates alarms when the patients are likely to be in a critical situation. The MCS provides a real-time multimedia desktop conferencing facility for watching patients and instructing attendants to administer some first-aid treatment. We carried out some experiments according to two different scenarios. The intensive patient monitoring service was functioning well in a 100Base-T Ethernet LAN environment.

• 산업경영시스템학회지
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• 제32권2호
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• pp.85-93
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• 2009

GOMS model is a cognitive modeling method of human performance based on Goal, Operators, Methods, Selection rules. GOMS model was originally designed for desktop environment so that it is difficult for GOMS model to be implemented into the mobile environment. In addition, GOMS model would be inaccurate because the original GOMS model was based on serial processing, excluding one of most important human information processing characteristics, parallel processing. Therefore this study was designed to propose a modified GOMS model including mobile computing and parallel processing. In order to encompass mobile environment, an operator of 'look for' was divided into 'visual move to' and 'recognize' whereas 'point to' and 'click' were combined into 'tab.' The results showed that newly introduced operators were necessary to estimate more accurate mobile computing behaviors. In conclusion, modified-GOMS model could predict human performance more accurately than the original GOMS model in the mobile computing environment.

• JSTS:Journal of Semiconductor Technology and Science
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• 제5권4호
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• pp.270-275
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• 2005

As the features of mobile phones are being enhanced and the performance is being greatly improved, the generic operating systems are being incrementally used in mobile phones. However, since the mobile phones have different requirements in both features and performance compared with desktop or server systems, the operating systems for generic systems could not be used without customization and modification. This case study paper describes the design and implementation of a Linux-based smartphone hardware and software. The enhancements and additional implementations in both kernel and middleware layers are explained. As an experiment, the power consumption of the implemented mobile phone under a number of user scenarios has been measured.

• 디지털콘텐츠학회 논문지
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• 제12권3호
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• pp.319-327
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• 2011

클라우드 컴퓨팅은 인터넷상에 기업이나 소비자들에게 IT서비스를 제공하기 위한 유연하고 비용 효과적인 검증된 전송 플랫폼으로, 계산이나 데이터가 데스크탑이나 포터블 PC로부터 대규모 데이터센터로 이동하는 계기가 되었다. 이와 같은 클라우드 컴퓨팅 서비스의 활성화를 위해서는 현재 제공되거나 향후 제공될 서비스가 현재와 미래의 고객을 만족시키기 위해 개선되어야 할 서비스 품질요건에 대한 분석이 필수적이다. 본 연구는 클라우드 서비스 환경에서 서비스품질 규명을 위한 연구의 일환으로서, 탐색적 방법을 사용하여 기존 다양한 문헌을 분석하였으며, 이로부터 7가지의 클라우드 컴퓨팅의 서비스 특성과 세부속성들을 정의하였다.

• 대한인간공학회지
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• 제28권4호
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• pp.109-115
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• 2009

The objective of this paper is to compare two national guidelines on the VDT work management published by Ministry of Labor(MOL) and Korean Standard(KS), and suggest possible modifications of them. The scope of this paper was limited to the desktop type of VDT jobs, excluding laptop environment. In addition, questionnaires were administered to office workers to collect information on the discomfort levels in meeting the MOL Notification. From ergonomic point of view, the most noticeable differences between two guidelines were found with respect to the heights of chairs and desks. In fact, the ranges specified in each guideline were not the same. In the field surveys, it could be known that work environments should be improved.

• TTA 저널
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• 통권139호
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• pp.40-43
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• 2012

주로 컴퓨터 자원(Platform, HDD, CPU)의 가상화를 통한 IT 인프라 관리 및 아웃소싱의 효율성을 추구하던 클라우드 컴퓨팅이 이제는 다양한 서비스 분야로 전환되고 있다. 심지어 사용자의 개인 데이터, 홈 가전기기, 헬스 기기 등의 모든 디지털화된 IT 자원이 스마트 폰, 태블릿 PC, IP-TV 중심의 N-Screen 등의 사용자 단말 기술들과 연계 및 진화하여 더욱 편리한 디지털 라이프의 변화를 주도하고 있다. 따라서 본 특집에서는 더욱 발전하는 클라우드 컴퓨팅의 주요 분야들 - 모바일 클라우드, DaaS(Desktop as a Service: 데스크톱 클라우드), 공공 부문의 SLA(Service Level Agreement), 퍼스널 클라우드 보안과 프라이버시 - 대해 기술적 동향과 이슈 등을 고찰하고자 한다. 특히 작금의 국제적 표준화가 ITU-T, ISO에서 조직과 체계를 구체적으로 마련하고 2012년부터는 본격적인 경쟁에 들어가는 중요한 시대적 위치에 있으므로 본 특집을 통해 국내 연구자 및 개발자들에게 표준화된 기술 및 서비스 개발에 동기를 부여하고자 한다. 본 특집을 기획하면서 클라우드 컴퓨팅은 IT의 인프라에서 응용까지 연계되어 서비스 산업의 좋은 모델로서 국가적 경쟁력을 끌어올릴 수 있는 중요한 기술임이 자명하며, 단기적으로 끝나는 기술이 아님을 다시 한 번 확인할 수 있는 좋은 기회로 산업의 많은 분야에 뿌리 깊이 내려지길 기대해 본다. 이를 위해 기업과 국가의 지속적인 개발과 지원에 대한 결정이 그 어느 때보다 필요하다.

• 디지털산업정보학회논문지
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• 제9권4호
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• pp.21-31
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• 2013

It is not easy to control the unstructured digital contents efficiently which are usually created while carrying out the wide scope of managerial activities. Moreover, besides the existing EDMS method, new methodologies including new-type servers and clients like SBC, VDI, thin client, zero client, etc are said to be more efficient for managing digital contents. Usually, digital contents has been created and stored in the dispersed individual computers like laptop or desktop. Today, due to the advent of new technologies and devices for computer systems and network capacity, it's possible to store whole digital contents within centralized storage like EDMS. In this paper, it is shown how digital contents can be controled through selection of which approaches are used for individual users and storage servers. For alternatives, we explained implementation, merits and demerits, selection criteria, etc. And a case of the implementation of digital contents control is shown for the reference of related systems.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1999년도 KOBA 방송기술 워크샵
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• pp.63-68
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• 1999

본 논문에서는 한국전자통신연구원 가상현실연구센터에서 개발한 탁상형 디지털 편집 시스템의 시제품인 "솔거"를 소개한다. 솔거는 PC 환경에서 MPEG2 데이터들을 처리하고 편집하는 통합형 비선형 편집기로, Directshow 기반의 서브모듈(sub-module)로 개발된 여러 필터들을 기반으로 다양한 시각/음향효과 처리를 제공한다. 이외에도 자유로운 모션 벡터 방향을 줄 수 있는 타이틀링 툴과 정지 영상을 편집할 수 있는 페인팅 툴을 갖추고 있다. 솔거의 특징은 시스템의 구성 가격을 낮추기 위하여 하드웨어 부가 장치 없이 모든 서브모듈을 소프트웨어만으로 구성하였으며 Directshow 기반의 필터개발로 시스템의 확장성과 이식성을 높였다. 이식성을 높였다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.117-120
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• 2009

New shading system, which is Grating Louver System into a pair glass, is proposed for integrated lighting system between Daylight Responsive Dimming Systems and shading system in this study. The optimized distance of louvers, which is to block direct sunlight into a space, is calculated. Grating Louver System was simulated using Desktop Radiance 2.0 of lighting simulation software for comparing daylight distribution and changes of control slope by distance from window to back wall with roller shading system controlled by sun profile angle.