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3GPP LTE/SAE 네트워크에서의 핸드오버 키 최적 갱신주기에 관한 연구
한찬규,최형기,Han, Chan-Kyu,Choi, Hyoung-Kee 한국정보처리학회 2011 정보처리학회논문지 C : 정보통신,정보보안 Vol.18 No.4
LTE/SAE는 공격자의 키 획득 및 공격에 노출된 네트워크를 방지하기 위해 핸드오버 키 관리기법을 정의하고 있다. 본 논문에서는, 핸드오버 키 관리 기법이 비동기화 공격에 의해 전방향안전성이 보장되지 못 함을 보인다. 비동기화 공격을 방지하기 위해, 주기적인 루트키 갱신이 요구된다. 이에 본 논문에서는 시그널링 부하와, 공격에 노출되는 패킷의 양을 최소화 하는 최적 루트키 갱신 주기를 도출하고자 한다. LTE/SAE has presented the handover key management to revoke the compromised keys and to isolate corrupted network devices. In this paper, we identify that the handover key management is vulnerable to so-called de-synchronization attacks, which is jeopardizing the forward secrecy of handover key management. We place an emphasis on periodic root key update to minimize the effect of the de-synchronization attacks. An optimal value for the root key update interval is suggested in order to minimize signaling load and ensure security of user traffic.
돼지고기가 공장근로자들의 신기능지표와 혈청 생화학치에 미치는 영향
한찬규,노정해,이복희,Han, Chan-Kyu,Rho, Jeong-Hae,Lee, Bog-Hieu 한국축산식품학회 2008 한국축산식품학회지 Vol.28 No.1
This study was conducted to reveal the effects of pork consumption on the renal and hematochemical indices of workers occupationally exposed to an unclean environment for 6 weeks. Forty-five free-living volunteers were recruited from the workers employed in a car-engine part factory and a leather dyeing company in the Gyeonggi area. Volunteers were to submit a subject consent form prior to the study. They were asked to complete a questionnaire on dietary habits, and blood and urine samples were collected before and after the pork consumption trial. Pork dishes were fed twice weekly (150g per meal) as part of lunch or dinner at the work place. Urine N-Acetyl-${\beta}$-D-glucosamidase (NAG) levels were reduced after the trial, but total-cholesterol, HDL-and LDL-cholesterol levels did not change. However, triglyceride levels did increase significantly (p<0.005). The Zn, Pb, and Cd concentrations in serum tended to decrease, though without statistical significance. In conclusion, the regular consumption of pork may be beneficial for renal functions, however further research in this area is needed.
한찬규,최상윤,정성화 한국축산식품학회 2011 한국축산식품학회지 Vol.31 No.1
Acanthopanax senticosus, a member of the Araliaceae used as an invigorant in traditional Korean medicine, is known to relieve physical fatigue. The principal objective of this study was to evaluate the effects of eggs laid by hens fed on Acanthopanax senticosus extracts on physical endurance and reproductive parameters. Male Sprague-Dawley rats at 4 wk of age were divided into 3 groups of 15 rats each: group A (14% egg yolk powder from hens fed with Acanthopanax senticosus extracts+86% AIN-93G), group B (14% plain egg yolk powder + 86% AIN-93G) and group C (7% fat source + 93% AIN-93G), and studied for 5 wk. The rats’ physical endurance was measured via forced swimming tests. According to the results,53.3% rats of group A swam for longer than 20 min, in group B and C, only 48.9% and 46.7% of the rats achieved this. In terms of reproductive parameters, sperm motility was significantly higher in group A than in groups B and C (p<0.05). However, no differences in sperm count were detected among the groups. Additionally, the serum testosterone levels of groups A and B were higher than that of group C. Our findings suggest that rats fed with egg yolk powder from hens fed on Acanthopanax senticosus extracts may improve athletic endurance and reproductive parameters in rats.