• Journal of Energy Engineering
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• v.11 no.4
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• pp.306-316
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• 2002

ln this paper, flowfields inside the various rooms have been investigated. A storage room, a liv-ingroom with a kitchen in an apartment, and a hospital room are considered in the present calculations. In all cases, it was found that the average of air change rate is. similar to that of perfect mixing assumption and the location of air purifier has little effects on the average air change rate. Detailed local air concentrations show that there are regions where air is not quite purified because of non-uniform circulation of air flow. The location of air purifier has great effects on this behavior.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06d
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• pp.322-326
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• 2008

시스템의 규모가 대형화되어 감에 '시스템의 시스템'의 형태로써 대규모 사이즈의 프로그램 다양한 목적을 가진 사용자들, 대규모 저장 데이터양과 처리, 소프트웨어 컴포넌트간의 복잡한 연결상과 상호 의존성, 하드웨어의 다양성등을 포함하는 초대형 규모로 발전하고 있다. 또한 유, 무선 인터넷의 보편화와 소형기기들의 인터넷화 및 기존 서비스들의 개방화가 진행됨에 따라 새로운 독자적인 서비스를 만들기 보다는 SOA기반의 기존 시스템을 통합하여 새로운 서비스를 만드는 시도가 일어나고 있다. 최근 진행되고 있는 국가 및 산업의 대형 프로젝트들은 이러한 흐름에 따라 IT기술을 융합한 소프트웨어 기반의 초 대형 시스템 (Ultra Large Scale System)을 필요로 하고 있다. 이에 본 논문에서는 이러한 정보와 시스템의 대규모화에 대한 즉각적인 대처를 할 수 있는 Ultra Large Scale 시스템의 자율적응형 (Self-Adaptive) 기술 연구를 위하여 Self-Healing, Self-Integrating, Self-Orchestrating, Self-Managing, Self-Adaptring의 5가지 관점에서의 연구를 제안한다. 본 논문에서 제안하고 있는 연구의 파급 효과를 극대화 할 수 있는 영역은 e-Biz 시스템 u-city 시스템, USN 기반 물류 시스템 자동차 및 조선 사업의 IT융합 등의 대규모 시스템이 될 것이다.

• Journal of Digital Contents Society
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• v.7 no.3
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• pp.169-174
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• 2006

In recent years, RFID is widely used in industrial applications including factory, material flow, logistics and defense areas. In this paper, The convolutional encoding and viterbi decoding is also implemented to improve the system performance. in an FPGA chip. The used convolution code is constraint length K=3 and rate R=1/2. The length of command frame and response frame is total of 48bits consisting of SOF 8 bits, command 16 bits, CRC 16 bit, and EOF 8 bits. And also the frame error rates are measured under the channel of line-of-sight and non line-of-sight, respectively. The performances are analyzed with FSK modulation only and FSK modulation added with convolutional encoding. These two measured results are compared with that of a RFID system with ASK modulation.

• JOURNAL OF ELECTRICAL WORLD
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• s.301
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• pp.68-73
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• 2002

미쓰비시(삼릉)전기는 1999년 5월치바현 이치가와시 동빈에$''$특정가정용기기재상품화법(통칭 : 가전리사이클법)$''$에 대응하기 위하여 일본국내 최초의 전기제품 리사이클 플랜트를 가동시켰다. 이 플랜트에서는 종합전기메이커로서의 특징을 살려 연소를 수반하지 않는 철저한 머티어리얼 리사이클, 물을 쓰지 않는 완전건식에 의한 소재(素材)의 분리$\cdot$분별(分別)을 실현하였다. 최대의 특징은 수(手)작업에 의한 부분분해와 기계분해(파쇄에 의한 소재분리)를, 리사이클률, 경제성, 환경부하성의 3가지 관점에서 조화를 시키고 있는 점이다. 본고에서는 리사이클 플랜트의 개요를 소개하고 리사이클률 향상과 리사이클 처리비용 저감을 위해 대처해 온 다음의 3개 항목에 대하여 기술한다. (1) 플라스틱찌꺼기(殘材) 리사이클설비의 개발 주파쇄분리(主破碎分離) 프로세스에서 배출되는 금속과 염화비닐을 포함한 플라스틱찌꺼기를 처리하여, 플라스틱을 고로환원재(高爐還元材)로서 유효 활용할 수 있도록 하였다. (2)효율적인 물류(物流)레이아웃 및 수해체방식(手解體方式)의 설계 공장내의 폐제품(廢製品)$\cdot$분별물(分別物)에 대한 보관장소, 반송수단$\cdot$경로를 최적 설계하여 처리비용을 요하는 수해체 작업을 효율적으로 할 수 있도록 업무흐름을 설계하였다. (3)리사이클공장 관리시스템의 구축 공장관리의 효율화와 배출자(排出者)에 대한 리사이클정보가 분명하게 나타날 수 있게 하기 위하여 리사이클공장관리시스템을 개발하여 도입하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.542-545
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• 2006

In recent years, RFID is widely used in Industrial applications including factory, material flow, logistics and defense areas. In this paper, we developed a RFID baseband system with ASK modulation and convolutional channel code. A commercial ASK RF module is used and its frequency range in $350\sim351MHz$ and power is 10mW and the convolution code is constraint length k=3 and rate R=1/2. The performance is measured by frame error rate and the convolutional code is very useful in performance improvement and, also we implemented the binary search algorithm as anti-collision method and we show the wave shapes whit collision occurrence. This RFID system is designed by FPGA therefore it produces result of speed-up and improvement of reliability.

• Korea Trade Review
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• v.41 no.4
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• pp.91-110
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• 2016

AEO certification has a positive effect on firm's performance. Therefore, this study analyzed the effect of AEO certification on firm's performance using panel data analysis for firm to have international competitiveness. It uses the Hausman-Taylor test for effective solutions of endogenous matter. In terms of the result of analysis, AEO certification has a positive effect on domestic and foreign sales, especially direct benefit and business process improvement of AEO certification have a positive effect on domestic and foreign sales through the improvement of international logistics flow. In conclusion, this study proposes the policy of AEO certification by analyzing the effect of AEO certification on firm's performance by using the panel data analysis.

• Asia Marketing Journal
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• v.2 no.1
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• pp.65-82
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• 2000

McCarthy(1960) 이후 오랫동안 4P 스키마타에 대한 논의가 없다시피하다가 Waterschoot and Van den Bulte(1992)가 특히 촉진믹스에 문제가 많음을 지적함으로써 마케팅믹스 분류체계에 대한 논의가 다시 시작되었다. 하지만 이들 논의 내용 또한 '4P 스키마타'를 재해석하는 정도이지 이를 넘어서지는 못하고 있다. 필자들은 4P 스키마타의 한계점을 Hunt(1983, 1991)의 스키마타 평가기준에 따라 크게 네 가지로 지적한다. 먼저 분류대상의 속성이나 특징이 명확하지 않고, 다음으로 실무의 흐름을 제대로 반영하지 못하여 유용성에 문제가 있으며, 세 번째로 분류된 범주간에 배타성과 포괄성이 부족하다. 끝으로 4P 간에 순서나 위계가 없어 문제의 진단이나 투자의 효율성을 논의하기가 어렵다. 이런 점들을 고려하여 연구자들은 4P를 원점활동과 접점활동으로 나누고 Parasuraman, Zeithaml, and Berry(1985; 1988 a,b; 1994)의 갭 모델을 원용하여 마케팅믹스의 새로운 분류체계인 '갭 스키마타'를 제안한다. 접 스키마타는 고객 갭과 마케터 갭 1, 2, 3, 4로 구성된다. 고객 갭이란 고객의 기대와 지각간의 차이 즉, 고객만족을 뜻하고 갭 1이란 마케팅조사를, 갭 2, 3은 원점활동을, 갭 4는 접점활동을 지칭하다. 원점활동인 갭 2란 상품기획, 브랜딩, 가격책정으로 구성되며; 갭 3은 광고 및 판촉으로 구성되고; 집 4는 유통 및 물류, 인적판매내지는 영업, 고객서비스로 구성된다.

• Journal of Korea Port Economic Association
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• v.29 no.2
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• pp.19-38
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• 2013

This paper explores the relationship between shipping firm's investment and debt-ratio characteristics. Using a panel of 41 shipping firms from 2006 to 2011, this study finds evidence that debt/asset ratio and leverage are negatively associated with firm's investment activities. This relationship shows that volume of debt and capital structure are critical decision factor on firm's investment and capital financing. In terms of financial expenses to sales, positive relationship is existed with firm's investment finding that financing cost is important to investment. The previous study of the firm's investment in other sector also shows a negative relationship with debit ratio. This study is also interested in the extent to which the firm's investment is affected by firm size because there is general agreement that smaller firms have less access to external capital markets. As results, smaller companies group have more positive relationship with factors related to financing cost such as financial expenses to sales and tax. On the other hand, bigger companies group shows the evidence that firm investment is positive relationship with asset size. The analysis corresponding to economic fluctuation shows that debit ratio is more sensitive to firm's investment during a recession. On the other hand, financial expenses to sales is more related to firm's investment during an economic boom.

• Journal of the Korea Society of Computer and Information
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• v.17 no.5
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• pp.137-146
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• 2012

In SCM(Supply Chain Management), a management paradigm where the customer satisfaction is to be achieved by minimizing the cost, reducing the uncertainty, and obtaining the overall optimization. As it performs the integrated operation of the paths of information, assets, and knowledge from the raw material providers to the retailers, the adoption of RFID(Radio Frequency Identification) in SCM could be expected to magnify the effectiveness of the system. However, there is a huge risk by deciding whether or not RFID system is adopted without the objective analysis under the uncertain circumstances. This research paper presents the statistical analysis methodologies for the comparison of RFID with Barcode on the aspect of utility and the statistical analysis tool, RUSAT, which was programmed for nonstatisticians' convenience. Assuming a pharmaceutical industry, this paper illustrates how the data were entered and analyzed in RUSAT. The results of this research are expected to be used not only for the pharmaceutical related company but also for the manufacturer, the whole-saler, and the retailer in the other logistic industries.

• Journal of Korea Port Economic Association
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• v.23 no.1
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• pp.115-148
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• 2007

Under the influence of ever-globalized world economy, Yangsan Port of Shanghai, a central hub of Chinese economy, was opened up on Dec. 1, 2005 in the expectation of heart of northeast Asian harbor logistics. It has triggered severer competitions among northeast Asian ports. In an effort to keep robust standing as a central port of northeast Asia, Korea has still built additional new ports and opened up 3 docks in Nov. 2005. Amid these changing port environments, it is foremost to take the competitive edges of new ports in advance of major rival ports in the interest of preoccupying the standing of those new ports as the central hub of northeast logistics. According to the developmental strategies of new ports can be summed up as follows: First, it is required to separate port development from marketing as a part of separating developmental entity from management/maintenance entity. Second, it is required to develop dedicated port for feeder vessels along with new ports to save more time and cost spent by shipping companies. Third, the attraction of jumbo shipping companies to port development needs differentiated countermeasures for each shipping company, and those measures should be taken in advance before jumbo shippers decide their own shipping strategies in future. Fourth, in terms of incentives for attracting jumbo shipping companies, it is required to offer the incentives to them in using new ports in connection with Busan ports. Fifth, it is critical to set up a benchmark of competitors(ports) for establishing one-stop automatic administration process system upon developing ports. Finally, it is required to prepare a plan for using rearward lands in connection with ports for more efficient use of development complex behind port.