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.

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.

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.

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.

SFR을 이용하는 셀룰러시스템에서 형평성 향상을 위한 단말 구분기법

권영민(Young Min Kwon),구자헌(Jaheon Gu),추현승(Hyunseung Choo),이태진(Tae Jin Lee),정민영(Min Young Chung) 한국통신학회 2012 한국통신학회 학술대회논문집 Vol.2012 No.2

부모 양육행동 척도 개발과 타당도 연구

권영민(Kwon, Young-Min),서경선(Seo, Kyeong-Seon) 한국아동심리치료학회 2018 한국아동심리치료학회지 Vol.13 No.2

The purpose of this study is to develop a Parenting Behavior Scale and to verify its reliability and validity. Altogether, seven types of parenting behaviors were extracted and 70 preliminary items were administered to 453 mothers and 52 fathers raising children ranging from 5 to 16 years old. 40 final items were selected. The results are summarized as follows. First, the results of the factor analysis for the 40 items showed 8 factors accounting for 58.17% of the total variances. Each of the 8 factors was correlated with positive parenting behaviors such as receptive discipline, warmth and support, respect as well as with negative parenting behaviors such as criticism and aggression, inappropriate role modeling, inconsistency, interference and neglect. Second, the reliability of the 8 factors ranged from .69 ~ .88. Third, the relationship between parenting behavior and parenting efficacy was examined with the results showing that positive behaviors along the parenting behavior scale were correlated with parenting efficacy while negative behaviors were seen to have an adverse effect on parenting efficacy. Fourth, cross-validation of parenting behaviors was verified with a reasonable level of reliability. In the conclusion, the implications and limitations of this study are discussed.

WTO체제 출범 이후의 무역분쟁 추이분석 및 사례연구

권영민(Youngmin Kwon) 한국경제연구원 1998 한국경제연구원 연구보고서 Vol.1998 No.-

When the WTO regime has launched in 1995, most of the world have no doubts about the expectation that the reduced trade barriers would boost the world trade and economic growth. There have been many studies on the effects of WTO regime on trade and growth. However, after three years, there are not many studies on actual effects of the WTO regime. This paper is an attempt to bridge such a gap between initial enthusiasm for the newly created WTO Regime and its actual effects. This paper, especially, focuses on its dispute settlement regime and tries to extract the pattern of trade disputes and their settlement for last three years through the analysis of 83 cases that consultation has been requested through the dispute settlement body of the WTO. For the qualitative analysis of the pattern of disputes and their settlements, this paper suggests several indexes that help indicate the degree of practical benefits that each country tries to get out of the dispute settlement mechanism of the WTO. They are Simple Offensive Index, Panel Establishment Rate, and Complaint Success Rate. Although there are limitation to use indexes, due to the lack of sufficient number of cases for each country, Simple Offensive Indices that indicates the aggressiveness of the use of dispute settlement mechanism, reveal that the United States and the European Commumties are most active in filing cases against other countries. However, Korea and Japan are shown to be at the bottom of the list. Again in the case of Panel Establishment Rate, which indicates the activeness of defense in dispute settlement, the United States and the European Communities are on the top, which Korea and Japan are of the bottom. In the later part, by conducting case studies on three selected cases, this paper attempts to extract the reason for the inactiveness of Korea in utilizing dispute settlement mechanism of the WTO. For the more active utilization of the dispute settlement mechanism, it is suggested that Korea should have more efficient system of conducting its trade policy. Especially, Korea should develop a formal as well as informal channels throughout business corporations, scientlf1c experts and government officials, so that the actual need of business sector and professional knowledge of experts could be used in its administration of trade policy and dispute settlements.

한국인의 요 중 3-PBA 노출수준 분포 특성

권영민(Young Min Kwon),김현정(Hyun Jeong Kim),박경화(Kyung Hwan Park),최욱희(Wook Hee Choi) 환경독성보건학회 2013 한국독성학회 심포지움 및 학술발표회 Vol.2013 No.5

WTO 체제에 대한 미국의 불만 : 분쟁해결의 성과에 따른 비교 분석

권영민 ( Youngmin Kwon ) 한국국제통상학회 2021 국제통상연구 Vol.26 No.2

상소기구 패널의 신규임용 등을 방해하며 다자통상체제의 무력화를 시도했던 트럼프 행정부가 물러나고 바이든 정권이 취임하며 공석 중이던 사무총장도 임명됨으로써 그 동안 부분적 기능에 그쳤던 분쟁해결제도 등 WTO의 정상화를 기대해볼 수 있게 되었다. 그러나 DDA 협상중단 이후 추가적인 자유화 진전이 없는 가운데 현행 규정을 가지고 중국 등 경쟁국의 불공정 행위를 제대로 규제할 수 없다고 보는 미국의 입장에는 변화가 없다. 따라서 자국의 통상이익을 지키려는 미국의 입장에서는 WTO 체제를 자신들의 구미에 맞게 개편하려 들 것이다. 그러한 예상을 바탕으로 본 연구는 지금까지의 분쟁해결 결과에 대한 실증분석을 통해 WTO 부속협정 중 미국의 불만을 가질 분야를 검토해보았다. 그 결과 미국은 반덤핑과 보조금 ․ 상계조치 협정에 불만의 가능성이 가장 크며 또한 그 분야 분쟁의 세부내용을 살펴보면 자국의 통상주권이나 경쟁주도권이 침해되는 상황을 우려하는 것으로 파악할 수 있다. The vacancy of WTO director general has been filled, as the new President of the US takes over Trump administration, which had tried to nullify or at least weaken the multilateral trade regime in many ways that include the blocking of renewing appellate panel members. While there are hopes for the normalization of WTO's function such as its dispute settlement procedures, however, without meaningful progress of further trade liberalization since the failure of DDA negotiations, the US dissatisfaction against current regime has grown, not resolved, and still existed. As Mr. Biden himself committed to restore the world orders that were impaired by his immediate predecessor, the US would abstain from unilateral actions for now and try instead to reform existing WTO regimes for their favor. Based on such expectations, this paper analyzes the possible sources of the US complaints on current WTO’s annex clauses. Adopting a logistic regression model, this paper identifies the anti-dumping and the subsidy and countervailing measures agreements as the most highly likely reasons of the US dissatisfactions. Further investigations into actual disputes settlement outcomes involved with the US, respondent as well as complainant, suggest that the situation in which their trade policy sovereignty and the world leadership position being challenged would be real concerns.

시조의 시적형식과 그 창곡의 음악적 형식과의 상호관계

권영민 ( Young Min Kwon ) 일지사 1978 韓國學報 Vol.4 No.3