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링크 계층 재전송을 고려한 무선 패킷 스케줄링 알고리즘
김남기,윤현수,Kim, Nam-Gi,Yoon, Hyun-Soo 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.2a
본 논문에서는 MAC 계층 이하에 존재하는 링크 계층 재전송 기법과 잘 부합할 수 있는 새로운 무선 패킷 스케줄링 알고리즘인 WFQ-R (Wireless Fair Queueing with Retransmission) 알고리즘을 제안한다. WFQ-R 알고리즘에서 링크 계층 재전송에 의해 사용된 자원은 재전송을 수행한 플로우(flow)가 다른 플로우들에게 미리 차용한 자원으로 취급한다. 즉 MAC 계층 이하의 재전송 과정에서 패킷 스케줄러의 허락 없이 사용되어진 자원을 재전송을 수행한 플로우에게 책임 지움으로써 WFQ-R 알고리즘은 무선 공평성(fairness)을 획득할 수 있게 된다. 본 논문에서는 실험을 통하여 WFQ-R 알고리즘기 공평성을 유지함과 동시에 시스템 성능을 최대화 함을 보인다. 또 플로우 구분성(seperation)과 보상성(compensation)도 획득할 수 있음도 보인다. We propose a new wireless fair queueing algorithm, WFQ-R (Wireless Fair Queueing with Retransmission), which is well matched with the LLR (Link Level Retransmission) algorithm and does not require channel prediction. In the WFQ-R algorithm, the share consumed by retransmission is regarded as a debt of the retransmitted flow to the other flows. Thus, the WFQ-R algorithm achieves wireless fairness with the LLR algorithm by penalizing flows that use wireless resources without permission under the MAC layer. Through simulations, we showed that our WFQ-R algorithm maintains fairness adaptively and maximizes system throughput. Furthermore, our WFQ-R algorithm is able to achieve flow separation and compensation.
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오프라인 쇼핑몰에서 고객 행위에 기반을 둔 맞춤형 브랜드 추천에 관한 연구
김남기,정석봉 한국정보기술응용학회 2016 Journal of information technology applications & m Vol.23 No.4
Recently, development of indoor positioning system and IoT such as beacon makes it possible to collect and analyze each customer’s shopping behavior in off-line shopping malls. In this study, we propose a realtime brand recommendation scheme based on each customer’s brand visiting history for off-line shopping mall with indoor positioning system. The proposed scheme, which apply collaborative filtering to off-line shopping mall, is composed of training and apply process. The training process is designed to make the base brand network ( BBN ) using historical transaction data. Then, the scheme yields recommended brands for shopping customers based on their behaviors and BBN in the apply process. In order to verify the performance of the proposed scheme, simulation was conducted using purchase history data from a department store in Korea. Then, the results was compared to the previous scheme. Experimental results showd that the proposed scheme performs brand recommendation effectively in off-line shopping mall.
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생산 자동화 라인의 실시간 데이터를 활용한 모바일 시스템 구축
김남기,한강희,왕지남 대한산업공학회 2019 대한산업공학회 춘계학술대회논문집 Vol.2019 No.4
디지털 트윈 기술이 스마트 팩토리 기술로 연구되어 적용되고 있다. 디지털 트윈 기술은 생산 자동화 라인의 상태를 다른 컴퓨터상에서 실시간으로 감시하고 제어하는 영역으로도 사용된다. 본 연구는 원격지에서도 설비 상태를 제어코드 기반으로 감시하고 제어하며, 이상 발생에 관해 탐지하는 것을 목표로 한다. 원격지에서 설비의 제어상태를 실시간으로 확인할 수 있고, 설비를 직접 제어할 수 있기 때문에 시간과 장소의 제약으로부터 자유로워진다. 향후 모바일 시스템을 통해 수집되는 데이터는 인공지능을 이용한 분석을 통해 예지 보전 분야에 사용될 수 있다.
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Zymomonas mobilis CP 3를 이용한 연속식 에칠알콜 제조에 효모 추출물과 옥수수 씨눈 추출물이 미치는 영향
金男紀,姜元萬 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.1
By the protection effect of some nutrients in yeast extract and corn germ extract from the inhibitions of substrate and products and increased cell mass, higher ethyl alcohol productivity can be obtained by using lower than 1% yeast extract and 0.33% corn germ extract concentration, likewise a soluble protein, lipid, soy flour extract, and the mixture of protein and lipid, in continuous ethyl alcohol production system by Zymomonas mobilis CP 3. At 0.2% yeast extract and 0.33% corn germ extract, the maximum selling price of produced ethyl alcohol per unit cost of added materials was shown and the maximum increased rate of ethyl alcohol concentration was obtained at 0.6% yeast extract and 0.33% corn germ extract. Ethyl alcohol yield was changed only a little but cell yield was generally increased by increasing in the concentration of yeast extract in this study.
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Yeast외 Z.mobilis의 화학적 조성에 의한 경제성의 비교 연구
金男紀 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2
Due to the high price of petroleum, the interests of the world are focused on the ethanol produced from renewable resources as an alternative or additive fuel to gasoline in order to improve octane value of gasoline. Some insisted that the ethanol fermentation by bacterium (Zymomonas mobilis) is more efficient than by yeast because ethanol yield of bacterium is a little higher than that of yeast, but others reported that yeast still showed better results than bacterium. In this paper, their efficiency was compared with their chemical composition and the composition of the raw materials to find out which organism is better and which raw material is the cheapest; barley, corn, wheat, potato, sweet potato and sorghum grain. The following results were obtained: 1) Barley was the cheapest raw material due to the highest concentration of carbohydrate when whole corn was used. 2) De-germed corn was the cheapest raw material owing to an extra profit of corn germ and gluten. 3) Z. mobilis was more economical micro-organism than yeast when dead cells of yeast could not be sold. 4) Yeast was more economical micro-organism than bacterium due to an additional income of its dead cells to be sold.
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수직 고정망에 고정된 미생물을 이용한 Ethanol 제조
金男紀,李眞雨 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.1
Kinetic behaviors of immobilized microbial cells on vertical film by aluminium screen in a column reactor were investigated for batch and continuous fermentation at 30℃ and pH=5.0. For the comparison of ethanol productivity, Zymomonas mobilis ATCC 29191, Saccharomyces cerevisiae ATCC 26603 and dual organisms of these were separately immobilized with 3%(W/V) agar-agar gel and 4%(W/V) k-carrageenan gel. The results obtained in this experiment were as follows : 1) In batch fermentation, the maximum produced ethanol concentration of Z. mobilis was 47.8g/l, that of S. cerevisiae was 37g/l and that of the dual organisms was 50g/l in agar-agar gel. In k-carrageenan gel, the maximum produced ethanol concentration of Z. mobilis was 45g/l, that of S. cerevisiae was 36.3g/l and that of the dual organisms was 47.3g/l. 2) In continuous fermentation, the maximum volumetric ethanol productivity of Z. mobilis was 19.36g/l·hr, that of S. cerevisiae was 18.16g/l·hr and that of the dual organisms was 26.4g/l·hr in agar-agar gel, while in k-carrageenan that of Z. mobilis was 17.09g/l·hr, that of S. cerevisiae was 14.7g/l·hr and that of the dual organisms was 17.82g/l·hr. The volumetric ethanol productivity of the dual organisms was better than that of Z. mobilis and of S. cerevisiae. The agar-agar gel was a more efficient matrix than k-carrageenan gel in ethanol production and volumetric ethanol productivity. 3) The ratio of ethanol concentration at height of 30cm from the bottom of the fermentor to the ethanol concentration at the effluent port was over 90% for each cell and matrix.
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김남기,김철환,왕지남 대한산업공학회 2019 대한산업공학회 추계학술대회논문집 Vol.2019 No.11
제조 현장에서는 다양한 설비들의 상호작용 과정을 볼 수 있다. 그 중에서도 주조 제품의 생산에 있어서 유/공압 실린더의 역할이 지대하다. 제품 생산에 중추적인 역할을 하는 실린더 설비에 급작스러운 이상이 발생하여 생산이 중단된다면 여파는 매우 클 것이다. 이에 본 연구에서는 유압 실린더 설비와 관련된 데이터를 수집하고 분석하여 이상 여부를 바로 탐지할 수 있는 체계를 구축해보고자 한다. 설비 이상 탐지 자동화가 실현된다면 설비의 작동이 중단되는 일을 사전에 예방하고 제품의 생산성을 높이는 것에 기여할 수 있을 것으로 기대한다.
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