• 대한공간정보학회지
• /
• 제8권2호
• /
• pp.109-116
• /
• 2000

자바 언어를 이용하여 구축한 위성 영상 처리 소프트웨어인 GeoNet은 자바 언어의 장점을 그대로 수용하는 cross-platform 대용량 위성 영상처리 API로써의 인터페이스를 제공하며 개발 기간을 단축하는 자바 객체지향 패러다임의 기반에서 구축되었다. 네트워크 환경에서의 자바 확장성을 이용한 클라이언트/서버 이미지 처리의 적합성과 융통성 있는 시스템 구조로의 기반을 가지며 웹브라우저를 통한 실행도 GeoNet의 특징이다. 본 연구에서는 자바 언어를 통한 위성 영상 처리 소프트웨어 GeoNet의 개발을 통해 앞으로 확대될 위성 영상의 보급과 분산 환경에서의 영상 처리 요구에 신속히 대처할 수 있는 대안을 제시한다.

• 한국정밀공학회지
• /
• 제33권8호
• /
• pp.635-640
• /
• 2016

The shell body is the main exterior part of a compressor, and production of shell bodies has increased along with a growing demand for air conditioners, refrigerators, air compressors, and so on. Cracks frequently occur in the process of welding a shell body. In this study, a deep drawing process for creating a shell body from a blank is developed. The technique consists of a four-step deep drawing and a two-step trimming process. Analysis is performed by DEFORM software to examine the safety of the deep drawing and trimming processes. The deep drawing process for the shell body developed in this study would have wide application in many industrial fields.

• 전기학회논문지
• /
• 제61권1호
• /
• pp.155-161
• /
• 2012

The firmware upgrade, which is remotely performed, is an essential function in smart metering or AMI (Advanced Metering Infrastructure). In other words, the AMI software and firmware can be switched for maintaining and improvement without replacement of H/W devices in AMI environment. Also, if number and type of devices are increase, the demand of remote update service will be increased. Through the firmware upgrade service remotely, the electric power corporation may be able to benefit various fields. For example, there are to adapt more easily in many environments, real-time service and to cut maintenance costs. In this paper, we proposed to design an international level FUMS(Firmware Upgrade Management System) which includes requirement function, architecture and protocol related with DCU, Smart Meter.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (C)
• /
• pp.253-255
• /
• 2003

Electricity is the prime commodity in mobile device, e.g. smart phone, PDA, MP3 player and etc. This strict restriction on power consumption requirement of the mobile device puts unique demand in designing hardware and software components of the device. In this paper, we address the issue of minimizing the power consumption in retrieving the continuous media data from the disk drive for real-time playback purpose. Different from the legacy text based data, real-time multimedia playback requires that the storage supplies the data block continuous fashion. This may put immense burden on the power scarce environment since the disk Is required to be active for the entire playback duration. We develop elaborate algorithm which carefully analyzes the power consumption profile of the disk drive and which establishes the data retrieval schedule for the given playback. It computes the amount of data blocks to read, the length of active and standby period. According to our simulation result, the ARM algorithm exhibits superior performance in continuous media retrieval from the aspect of power consumption to legacy playback scheme.

• International journal of advanced smart convergence
• /
• 제12권3호
• /
• pp.19-24
• /
• 2023

Recently, fifth generation (5G) networks are being deployed in phases all over the world, the paradigm has shifted to developing the next generation wireless technologies, which have grown exponentially in last few decades, wireless networks are promising for the demand to enormous connections. Non-orthogonal multiple access (NOMA) and intelligent reflecting surface (IRS) are considered as the key technoloies for next-generation beyond 5G (B5G) and sixth generation (6G) networks, in which IRS can play an important advance in the wireless propagation environment, and NOMA can effectively increase massive connectivity to improve user fairness. In this paper, we analyze a performance on the strongest channel user in terms of achievable data rates numerically. Then, with the achievable data rates, the signal-to-noise ratio (SNR) gain is calculated for the IRS-NOMA network over the conventional NOMA network. As a consequence, IRS-NOMA schemes have been considered as some key technologies.

• 한국도서관정보학회지
• /
• 제48권3호
• /
• pp.303-331
• /
• 2017

지역예술단체는 공연, 전시, 공모전, 축제 등 지역 내 다양한 행사를 주관하고 지역예술가의 정보 공유의 장, 신진예술가 발굴 및 지원 등 지역의 문화예술활동을 주도하며 오랫동안 지역 사회의 예술문화 발전에 큰 공헌을 하고 있다. 지역예술단체 기록은 과거와 현재의 지역문화예술의 수준과 가치를 보여주는 역사적인 의미를 지닌 기록이기 때문에 체계적인 관리가 필요하다. 또한 다양한 프로젝트를 진행하면서 생산된 지역예술단체의 기록은 이용자의 관심과 요구가 높기 때문에 이를 효과적으로 보여줄 수 있는 전시 서비스가 필요하다. 이에 본 연구는 공개소프트웨어인 CollectiveAccess를 기반으로 지역예술단체 디지털 아트 아카이브를 구축하여 지역예술단체 기록을 체계적으로 관리하며 전시 서비스할 수 있는 방안을 제시하고자 한다.

• 정보화연구
• /
• 제11권1호
• /
• pp.53-62
• /
• 2014

본 연구는 국내외 환경변화에 따른 해외거점의 설치 타당성 및 당위성을 조사하고 (why), 국내 기업들의 해외시장 진출 수요(what)를 파악한 후 해외거점으로 적절한 지역(where)과 그 운영방식(how)을 검토하였다. 본 연구는 설문조사와 전문가 인터뷰 방법론을 사용하였다. 인터뷰를 통하여 얻은 잠정 결론을 바탕으로 설문조사를 실시하였으며 설문조사의 통계분석결과를 전문가 집단과 함께 분석하여서 정책대안을 제시하였다. 본 연구에서 제안 하는 해외거점의 대상 지역은 동남아시아이다. 설문조사에서는 인도네시아, 베트남, 태국, 말레이시아, 싱가포를 순으로 선호도 나타났다. 본 연구에 제안하는 모델은 기존의 센터와 같이 한 국가에 설치하고 한 국가만 관리하는 모델이 아니다. 동남아 신흥시장은 실제로 여러 개의 개별 국가 시장으로 나누어져 있으며 개별 시장은 문화, 언어, 정치, 경제적으로 전혀 다른 구조와 운영 방식을 가지고 있다. 본 연구에서는 현재 선호도가 높은 곳에 허브센터를 설치하고 인접 국가에 분소를 설치하는 방안을 제안하였다. 예컨대 싱가포르에 중점센터를 우선 설립하고 센터의 안정화가 이루어진 후에 새로운 위성센터를 설립하는 방안을 생각할 수 있다.

• 한국통신학회논문지
• /
• 제38B권4호
• /
• pp.266-278
• /
• 2013

본 논문은 인터넷과 같은 다중제공자(multi-provider) 네트워크 환경 하에서 패킷 플로우를 효과적으로 제어하기 위한 SDN(Software Defined Networking) 기반의 정책 제어기를 소개한다. 제안된 정책 제어기는 네트워크 가시성 정보를 이용해 가상링크 및 가상포트 등을 직관적으로 제어함으로써 효과적인 서비스 오버레이 네트워킹(service overlay networking) 환경을 실현한다. 또한, 논리적으로 구분된 다수의 주문형 가상망을 신속히 구성하고 동적으로 관리함으로써 응용에 최적화된 네트워킹 환경을 사용자에게 제공한다. 본 논문에서는 정책 제어기의 구조 및 특징을 소개한 후, 멀티캐스트를 위한 두 가지 서비스 응용을 예시한다. 또한, 해당 응용들을 이용한 네트워크 서비스의 구성 시간을 성능 평가함으로써 정책 제어기의 적용 가능성을 확인한다.

• 한국멀티미디어학회논문지
• /
• 제18권1호
• /
• pp.25-34
• /
• 2015

Recently, in distribution market, demand for electronic shelf label system is increasing gradually to provide the accurate price immediately and detailed product information to consumers and reduce operation costs. Most of electronic shelf label system companies develop the full-graphic display device to display a wide variety of product information as well as the exact price. Our system had introduced Go-Back-N retransmission method in the early. However, we encountered performance problems that it delayed updating of the electronic shelf label system and exhausted the battery life time. Proposed adaptive image retransmission technique based on the selective scheme is that tags of electronic shelf label system recognize idle time of transmission cycle and require partial image retransmission to sever by itself. As a result, it can acquire much more opportunities of partial image retransmission within the same period and increase reception rate of full image for each tags. The experimental result shows that adaptive image retransmission technique's reception rate of full image for each tags is approximately 4% higher than existing previous works. And total battery life time increases 30 hours because tag reduce wake-up time as it receive only lost data instead of whole data.

• International Journal of Contents
• /
• 제11권1호
• /
• pp.41-51
• /
• 2015

Management systems for electronic library have been developed on the basis of Client/Server or ASP framework in domestic market for a long time. Therefore, both service provider and user suffer from their high cost and effort in management, maintenance, and repairing of software as well as hardware. Recently in addition, mobile devices like smartphone and tablet PC are frequently used as terminal devices to access computers through the Internet or other networks, sophisticatedly customized or personalized interface for n-screen service became more important issue these days. In this paper, we propose a new scheme of integrated management system for electronic library based on SaaS and Web Standard. We design and implement the proposed scheme applying Electronic Cabinet Guidelines for Web Standard and Universal Code System. Hosted application management style and software on demand style service models based on SaaS are basically applied to develop the management system. Moreover, a newly improved concept of duplication check algorithm in a hierarchical evaluation process is presented and a personalized interface based on web standard is applied to implement the system. Algorithms of duplication check for journal, volume/number, and paper are hierarchically presented with their logic flows. Total framework of our development obeys the standard feature of Electronic Cabinet Guidelines offered by Korea government so that we can accomplish standard of application software, quality improvement of total software, and reusability extension. Scope of our development includes core services of library automation system such as acquisition, list-up, loan-and-return, and their related services. We focus on interoperation compatibility between elementary sub-systems throughout complex network and structural features. Reanalyzing and standardizing each part of the system under the concept on the cloud of service, we construct an integrated development environment for generating, test, operation, and maintenance. Finally, performance analyses are performed about resource usability of server, memory amount used, and response time of server etc. As a result of measurements fulfilled over 5 times at different test points and using different data, the average response time is about 62.9 seconds for 100 clients, which takes about 0.629 seconds per client on the average. We can expect this result makes it possible to operate the system in real-time level proof. Resource usability and memory occupation are also good and moderate comparing to the conventional systems. As total verification tests, we present a simple proof to obey Electronic Cabinet Guidelines and a record of TTA authentication test for topics about SaaS maturity, performance, and application program features.