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애드혹 인지 무선네트워크에서 멀티 홉 전송을 위한 멀티채널할당기법
권영민,박형근,Kwon, Young-Min,Park, Hyung-Kun 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.1
스펙트럼 자원의 부족문제를 해결하고 스펙트럼 자원을 보다 효율적으로 사용하기 위해 인지무선통신기술이 제안되었으며 많은 연구가 이루어지고 있다. 애드혹 인지무선통신에서 멀티 홉 라우팅은 저 전력으로 먼 거리까지 데이터 전송할 수 있는 중요한 기법이다. 멀티채널을 갖는 멀티홉 라우팅에서 전송채널을 선택할 때 우선적으로는 주 사용자에 대한 간섭을 최소화할 수 있는 채널선택이 되어야하며 전송용량을 극대화하기 위해 채널 간 간섭을 최소화할 수 있는 채널선택기법이 필요로 된다. 본 논문에서는 멀티채널 멀티 홉 인지무선네트워크에서에서 채널 간 간섭을 최소화하며 주 사용자와의 충돌을 줄임으로써 용량을 높일 수 있는 채널 스케줄링 방식을 제안하였다. 제안된 방식은 라우팅경로와 채널선택을 동시에 수행한다. 제안된 채널 할당방식에 대한 시뮬레이션을 통해 용량과 충돌률 관점에서 그 성능을 분석하였다. To solve the shortage of radio spectrum and utilize spectrum resource more efficiently, cognitive radio technologies are proposed, and many studies on cognitive radio have been conducted. Multi-hop routing is one of the important technologies to enable the nodes to transmit data further with lower power in ad-hoc cognitive radio networks. In a multi-channel cognitive radio networks, each channel should be allocated to minimize interference to primary users. In the multi-hop routing, channel allocation should consider the inter-channel interference to maximize network throughput. In this paper, we propose multi-channel scheduling scheme which minimizes inter-channel interferences and avoids collision with primary users for the multi-hop multi-channel cognitive radio networks. The proposed scheduling is designed to determine both of routing path and channel selection. The performance of proposed channel allocation scheme is evaluated by the computer simulation in the aspect of capacity and collision rate.
큰번데기동충하초(Cordyceps militaris)의 혈당강하효과
권영민,조수민,김지헌,이재희,이연아,이승정,이민원,Kwon, Young-Min,Cho, Su-Min,Kim, Jee-Hun,Lee, Jae-Hee,Lee, Yeon-Ah,Lee, Seung-Jung,Lee, Min-Won 한국생약학회 2001 생약학회지 Vol.32 No.4
Cordyceps militaris (CM) has been used as a tonics in the traditional medicine. To investigate the anti-diabetic principle of CM, activity guided fractionation was conducted. Hot water extract of CM was fractionated into 3 parts: above 100,000(A), $100,000{\sim}20,000(B)$, below 20,000(C) in molecular weight using in membrane filter system. All fractions showed mild hypoglycemic activity in streptozotocin (STZ)-induced diabetic rats by oral administration (300 mg/kg). The fraction C which was most active among them was fractionated again into two parts, C-1 and C-2 by Sephadex LH 20 column chromatography. The fraction C-1 showed hypoglycemic activity but C-2 did not show activity compared with control in STZ mice. In glucose-fed hyperglycemic mice, fraction C, C-1 and C-2 also showed significant glucose lowering activity. Their decreasing rates of plasma glucose level after 1 hours administrations of fraction C, C-1 and C-2 were 24.5%, 29.3% and 22.0%, respectively (Tolbutamide: 48.4%). These results suggested that CM has both insulin like and insulin release promoting activity and could be developed as an antidiabetic agent.
사용자의 공평성과 채널품질을 고려한 분산형 무선인지MAC 프로토콜
권영민,박형근,Kwon, Young-Min,Park, Hyung-Kun 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.1
It is important that using of efficient radio resource because of deficiency spectrum problem, so that related to this problem many researches are have proceeded. To solve this problem, Cognitive Radio(CR) was suggested. The channels are allocated to the secondary users when the primary users don't use the channels, and unfairness of secondary users can be serious problem and channel quality of multichannel can be different due to the different traffic pattern of primary users. In this paper, we propose MAC prtocol both of the user's fairness and channel quality in CR networks. Simulation results show the comparison with CR MAC protocols. 스펙트럼의 자원의 부족으로 인하여 자원을 효율적으로 사용하는 기술이 중요한 기술이 되었고, 이에 따른 연구가 활발히 이루어지고 있다. 스펙트럼 자원을 효율적으로 사용하기 위한 방법으로 인지무선통신이 제안되었으며 부 사용자들은 주 사용자가 채널을 점유하지 않을 때 채널을 할당받게 된다. 따라서 인지무선 네트워크에서 부 사용자들간의 불공평성 문제가 발생할 수 있으며 멀티채널에서 각 채널들은 주 사용자의 트래픽 패턴에서 따라 서로 다른 채널 품질을 갖게 된다. 본 논문에서는 부 사용자간의 공평성을 보장하면서도 가용한 스펙트럼 자원의 채널 품질을 고려한 MAC 프로토콜을 제안하고 시뮬레이션을 통해 제안된 MAC 프로토콜의 성능을 비교 분석하였다.
Risk Assessment for Heavy Metals in Korean Foods and Livestock Foodstuffs
권영민,이경희,이행신,박선오,박정민,김진만,강경모,노기미,김동술,이종옥,홍무기,최달웅,Kwon, Young-Min,Lee, Kyoung-Hee,Lee, Haeng-Shin,Park, Seon-Oh,Park, Jung-Min,Kim, Jin-Man,Kang, Kyung-Mo,No, Ki-Mi,Kim, Dong-Sul,Lee, Jong-Ok,Hong, Moo- Korean Society for Food Science of Animal Resource 2008 한국축산식품학회지 Vol.28 No.3
This study was conducted to evaluate exposure level and risk of heavy metals in livestock foodstuffs and Korean foods. Based on the "Food Intake Data," a part of the 2005 National Health & Nutrition Survey and the "2005 Seasonal Nutrition Survey", 113 Korean foods items were selected. 3 samples from different manufacturers of each 113 items of Korean foods were purchased on summer and fall, so total 678 samples were used. The food groups were classified into 15 categories. For the livestock foodstuffs category, meats and poultry (chicken, pork, pork belly, beef, beef feet soup), milks and dairy products (milk, ice cream, liquid yoghourt, sherbet), eggs (egg) were selected. It was found that the daily amount of heavy metals intake (mg/person/day) from livestock foodstuffs is 0.00020 arsenic, 0.00000 cadmium, 0.00020 lead, and 0.00006 mercury, and the daily amount of heavy metals intake (mg/person/day) from Korean foods is 0.0265 arsenic, 0.0083 cadmium, 0.0067 lead, and 0.0028 mercury. Daily amount of heavy metals intake from livestock foodstuffs was low among the food groups. For risk assessment, PDI (Probable Daily Intake) was calculated and compared with PTWI (Provisional Tolerable Weekly Intake) of JECFA (Joint FAO/WHO Expert Committee on Food Additive). Relative hazard of these livestock foodstuffs was 0.006% in arsenic, 0.000% in cadmium, 0.085% in lead, and 0.149% in mercury. Relative hazard of Korean foods was 0.941% in arsenic, 14.676% in cadmium, 3.319% in lead, and 6.860% in mercury. Thus, livestock foodstuffs and Korean foods were as safe as satisfied with the recommended standards of JECFA.
권영민 ( Young Min Kwon ) 한국경제학회 2002 經濟學硏究 Vol.50 No.3
This article deals with growth effects of changes in labor endowments. In a model of technology trade between North and South, it is shown that an increase in skilled labor in either North or South increases the world growth rate. While increases in northern unskilled labor have negative growth effects, increases in southern unskilled labor can have positive growth effects under certain conditions. These results are different from Grossman and Helpman(199) and Lai(1995), in which technology diffusion occurs through imitation. They are also different from Liu(1994)`s model of technology trade, where only one type of labor is considered.
권영민(Young Min Kwon),이상훈(Sang Hoon Lee),진기창(Ki Chang Jin),이종찬(Jong Chan Lee),정성현(Sung Hyun Jung),구자진(Ja Jin Ku) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The research and development for high-efficiency and environmentally friendly excavators have been actively conducted in recent years. However, there is the limitation for the improvement of fuel economy and the reduction of emissions, due to the low efficiency of hydraulic system and a diesel engine in a conventional excavator. To overcome the limitation, the mid-size electric excavator is under development. In the electric excavator, an engine is substituted with an electric motor and a battery and also the electro-hydraulic system is adapted instead of hydraulic system. In this paper, overall project outline including system design and major components development for the electric excavator is introduced.