• Information and Communications Magazine
• /
• v.29 no.8
• /
• pp.42-49
• /
• 2012

본고에서는 B4G (Beyond 4G) 시스템의 기술 동향과 B4G 시스템을 위한 다양한 주파수 활용 기술에 대해 알아본다. B4G 시스템은 4G 통신 시스템 뿐만 아니라 기존 3G 이동통신망 또는 무선랜 시스템 등이 융합되어 다양한 서비스를 제공할 수 있을 것으로 기대된다. 또한 셀룰러망 기반의 새로운 M2M (Machine - to - Machine) 프로토콜의 등장으로 단말 간 직접통신 기술이 새로운 화두로 자리 잡고 있다. 이러한 B4G 시스템을 위해서는 효율적인 무선자원 활용이 가능한 주파수 활용 기술이 필수적인 핵심 요소이다. 따라서 본고에서는 향후 도래할 B4G 시스템의 요소 기술들을 소개하고, 이를 위한 핵심적인 주파수 활용 기술에 대해 알아보고자 한다.

• Information Systems Review
• /
• v.10 no.2
• /
• pp.269-289
• /
• 2008

It is very difficult problem to estimate and evaluate the performance of e-government system which scope and size are large and its effectiveness can not be seen shortly but reveals after several years. It is because the previous offline processes can not be transformed to online ones fully and shortly. For such e-transformation cases, the performance evaluation model should be adjusted and modified gradually as time passes. This paper propose new EEM(E-transformation Evaluation Model) model and methodology to evaluate G2B system that is one of large e-government project. EEM model can derive monetary value of e-transformatized business process areas(online areas). It also estimate the expected effect of offline area that is not yet transformed to online. EEM model consists of standard model, verification model and estimation model with some variables such as evaluation year, evaluation area and data type. By using survey data and database data together it can validate the correctness of the model and derive the effect of the system introduction. This paper also propose EEM evaluation methodology consisting of 5 stages and 10 sub processes to evaluate online and offline effect efficiently. To show the usefulness of this study, we evaluate the performance of Korea G2B system named KONEPS which is famous as a successful e-government case in the world by using the proposed model and methodology. The proposed model and methodology can be applied to different similar areas including e-government projects and large scale information system introduction in private sectors. This study can be also used for establishing appropriate policies about e-government project and informatization issues.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.35 no.4
• /
• pp.186-193
• /
• 2012

Assessing service quality and satisfaction is the essential part of service science. In this study, for G2B electronic commerce service composed of information systems and human resources, a composite research model for exploring factors of service quality satisfaction is proposed. The proposed model uses SERVQUAL's five quality dimensions as independent antecedent factors and usefulness and ease-of-use of the technology acceptance model as mediating factors. A case of a G2B purchase service is empirically studied using the proposed model. The result shows that the proposed composite model is good and appropriate for explaining the characteristics of G2B services.

• Proceedings of the CALSEC Conference
• /
• 2001.08a
• /
• pp.63-69
• /
• 2001

■ G28가 전자정부 구현에서 차지하는 중요성은 대부분의 선진국들이 전자정부구현의 기본 과제로서 G2B를 추진하고 있는 것에서 잘 알 수 있음 - 미국, 영국, 호주, 싱가포르는 교육, 고용, 의료, 전자조달, 기업서비스, 사회 보장 등 다양한 영역에서 전자정부 사업을 추진하고 있으며, G2B의 경우 모든 국가가 공통적으로 추진하고 있는 과제임- 미국의 경우, 연방정부와 지방정부의 85%이상이 향후3년 내에 전자조달 시스템을 구현 할 계획을 가지고 있으며, 상담수의 정부 기관은 이미 이러한 시스템을 갖추고 있음 ■ 민간 부문을 살펴보더라도, e-Business의 이니셔티브로서 구현이 신속하고 용이하며, 가장 큰 효과를 창출할 수 있다는 측면에서 전자조달을 우선적으로 추진하는 경우가 많이 나타남(중략)

• Journal of the Korea Organic Resources Recycling Association
• /
• v.24 no.1
• /
• pp.31-40
• /
• 2016

In this study, mesophilic anaerobic digestion of source separated food waste was carried out by leachate recirculation system and methane gas was produced. Two systems - system A and B were fabricated and placed within water bath to maintain $36^{\circ}C$. Each system was comprised of an anaerobic bioreactor and a leachate tank. Leachate in bioreactor was separated through the screen located at 30 mm above the bottom and a pump was installed to transfer collected leachate to the leachate tank. Everyday, 2.5 L of the leachate was pumped from the bioreactor to the leachate tank for 30 min and transferred leachate was pumped back to the top of the bioreactor for 30min, sequentially. Source separated food waste used for this experiment was washed by water before transferring to the laboratory. Transferred food waste was warmed to $36^{\circ}C$ before being fed to bioreactors. System A was fed to 49.1 g VS (Volatile Solids) and System B was fed to 54.0 g VS at every two weeks, respectively. $NH_4{^+}-N$ and salinity were monitored to see the inhibition toward anaerobic bioreaction and it was found that concentrations of these materials were not high enough to affect the bioreaction. Although the food waste was fed biweekly for 112 days and 140 days at system A and B, respectively, there was no sludge withdrawal from each system. Average methane productions rates were 0.439 L $CH_4/g$ VS and 0.368 L $CH_4/g$ VS for system A and B, respectively.

• Management & Information Systems Review
• /
• v.7
• /
• pp.113-124
• /
• 2001

인터넷을 기반으로 하는 B2B시장이 엄청난 속도로 증가추세를 드러내고 있는 가운데 국내 전자상거래 시장은 예상만큼의 기대치에 부응하지 못한 채 큰 발전을 보지 못하고 있는 상황이다. 이는 인터넷상에서의 효율적인 결제시스템의 부계와 전자상거래 시장의 특성인 신뢰성의 부재에 그 원인이 있다고 보아진다. 따라서 본 논문에서는 이러한 비대면의 전자적인 결제시스템에 따르는 신뢰성 문제해결을 위한 방안으로 Escrow계정을 이용하는 B2B 결제시스템을 제안하고자 한다. 본 연구에서 제안하는 Escrow Service시스템은 전자결제시스템의 걸림돌이었던 제품보증과 결제보증에 관한 문제를 데이터베이스로 구축하여 체계적이고 안정적인 방법으로 해결할 수 있는 EDI를 이용한 B2B ESCROW 결제서비스를 만드는 것이다. 구매기업과 판매기업간에 매매행위가 발생되면서 양사의 합의에 따른 Escrow사항들을 표준화된 데이터베이스 형식을 갖고 있는 EDI에 저장하고 거래 데이터베이스를 수행하면서 자동적인 EDI File Update를 통해 가장 실시간의 정보를 참조할 수 있도록 하는 것이다. 기존의 B2B 결제시스템에 있어서의 Escrow 기능이 계좌이체를 이용한 결제시스템에만 제한적으로 이용돼 왔었으며 또한 Escrow 시스템 수행이 수동적인 프로세스에 의해 움직여졌기 때문에 신뢰성과 이용도면에서 문제점이 있었다. 하지만 EDI를 이용한 Escrow시스템 구현은 프로세스의 자동화뿐만 아니라 계좌이체 및 기타 대출을 이용한 결제시스템에도 다양하게 적용할 수 있으며 또한 History관리가 가능하므로 전자상거래 결제시스템의 효율을 한층 더 높일 수 있을 것으로 기대된다.

• Proceedings of the KIPE Conference
• /
• 2008.06a
• /
• pp.615-617
• /
• 2008

본 논문에서는 태양에너지 실증연구단지에 설치된 서로 다른 2기 3kW급 태양광발전 시스템에 대한 5년간의 데이터 분석을 통하여 시스템 구성요소인 태양전지와 인버터의 효율 특성 및 시스템의 운전특성의 경년변화에 대하여 비교분석하였다. A 시스템의 경우 PV 어레이 변환효율은 2004년 이후 약 0.2% 정도로 지속적으로 떨어지는 추세를 나타내고 있으며, B 시스템의 경우 인버터의 효율은 약 0.5% 정도로 지속적으로 떨어지는 추세를 나타내고 있다. 2기의 PV 시스템의 발전효율, 이용율 및 성능비는 모두 2004년 이후 지속적인 효율저하를 나타내고 있음을 확인 하였다.

• Journal of Information Technology Services
• /
• v.11 no.2
• /
• pp.243-258
• /
• 2012

The G2B system is one of the important information systems in the e-government implementation. It is difficult to measure the cost reduction effect of the system introduction because there are many participants in the complex procurement processes. Previous approaches of the performance evaluation of such processes have been based on conducting some surveys and interviews with statistical methods. Therefore there have been some limitations in the verification of feasibility. Therefore this study tries to suggest a case of performance evaluation about the cost reduction in using of the G2B system by analyzing operational DB data from the G2B system. This study analyzed the procurement processes of G2B system according to 'goods' and 'facilities/services' and classified the procurement processes into 12 sub-processes. By developing an evaluation model for the cost reduction of e-procurement, we derived the whole cost reduction effect was 8,000 billon Won for the use of Korea KONEPS G2B system in 2008. Specially the cost reduction in the private sector was 6,600 billion Won. It was mainly due to the decrease of the offline visits to the related organizations to participate a bidding process. Moreover, the cost reduction of using shopping mall was 1,000 billion Won among the total 1,400 billion Won in the whole public sector. The main contribution of this paper is to show the more objective evaluation result of the use of e-procurement, which verifies the necessity of G2B system.

• The Journal of Society for e-Business Studies
• /
• v.15 no.3
• /
• pp.163-181
• /
• 2010

As a part of efforts to reduce the global emissions of greenhouse gases, the Kyoto Protocol was signed by major developed countries ("Annex I" countries). According to the Kyoto protocol, the Emission Trading Scheme that derives a trading market of the $CO_2$ emission rights is appeared. It causes that business institutions give lots of efforts to reduce $CO_2$ by using new environmentally sound technologies or increasing efficiency in production. On the while there have been several studies trying to develop a methodology to measure the effect of $CO_2$ reduction and its monetary value. In this research we suggest ECRE (Evaluation of $CO_2$ Reduction in E-transformation) model which can measure the $CO_2$ reduction effect through the introduction of G2B system. ECRC model was developed based on the IPCC methodology. ECRC model measures the two major effects of the $CO_2$ reduction which are '$CO_2$ reduction effect from transportation' and '$CO_2$ reduction effect from the decrease of paper use'. In this paper, we calculate the economic effect of $CO_2$ reduction with the case of the G2B system in Korea. This research suggests a basic methodology to measure the $CO_2$ reduction performance for the e-transformed institution.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.52 no.1
• /
• pp.175-181
• /
• 2015

In this paper, we develop a 2.4GHz ISM band wireless communication platform prototype based on embedded linux which support can be u-Hospital service. The developed system is available connecting between ARM920T processor board and FPGA board and linking IEEE 802.11b PHY board, AD/DA(10Bit) and RF(2.4GHz) board for wireless access. It is also can be utilized for the embedded system design with IEEE 802.11b/g Access Point(Option: IEEE 802.11a/b/g) test due to the Embedded Linux. Also, the developed system is possible to test and verify the radio access technology, Modem(OFDM etc) and IP(Intellectual Property) circuit. And make the most use of the system, we search for a expansion to that home and mobile healthcare, wellness service application.