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이동 애드 혹 네트워크에서 QoS를 지원하는 AODV 라우팅 프로토콜
吳世德,趙榮泰,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance victor routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end point is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average date reception rate. At that time, we used evaluation parameters such as node's mobility -stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.3% for 0 mobility-stop second case and 4.7% for 300 mobility-stop second case.
GMAHN 환경에 적응하는 에러 복구기능을 이용한 AODV 라우팅 프로토콜
정찬혁,오세덕,배진승,이기원,장양근,이광배,김현욱,유충렬,하재승 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-
Mobile nodes in ad hoc mobile networks typically communicate over wireless channels and are capable of movement. These are networks that support multihop communication and can be formed on a temporary basis. This paper proposes a solution that allows mobile nodes to access the wired Internet and to roam from base station to base station. And we also develop the efficient method that adapts in Global MANET which can be changed over time. It is observed that we can reduce not only error detection time but also network load, thus increasing the data reception rate in Global MANET Environment.
MANET 라우팅 프로토콜 QoS 지원서비스의 성능평가에 관한 연구
鄭燦赫,金鉉郁,李光培,姜景仁,朴京培,劉忠烈,吳世德,裵振勝,趙榮泰 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
In this paper, we evaluated two main QoS supporting routing protocol on wireless ad hoc network. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS support service between source and destination becoming a very important issue. Of all routing protocols, DSR and AODV are very important routing protocol in MANET. So we simulated DSR and AODV QoS Routing Protocol Through simulation evaluation tool NS(Network Simulation) based on various environments.
이동 애드 혹 네트워크에서의 환경적응형 QoS AODV 라우팅 프로토콜에 관한 연구
裵振勝,宋東勳,吳世德,鄭燦赫,金玄郁,李光培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance vector routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end points is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average data reception rate. At that time, we used evaluation parameters such as node's mobility-stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.293%, 15.914%, 17.238% for 300 mobility-stop second case and 4.809%, 4.264%, 2.956% for 300 mobility-stop second case.
宋東勳,裵振勝,鄭燦赫,吳世德,李基源,劉忠烈,河載承,李光培,金玄郁 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-
With rapid growth of the internet, need for the mobile communication networks is increasing. In this paper, we implement and test Mobile IP Protocol in Embedded System. Our Mobile IP-based testbed consisted of two sub-networks and each sub-network was configured to operate independently through use of router. To satisfy integrated wired/wireless network model established on the testbed design and show generality of the testbed, we implemented mobile nodes, home agent, foreign agent and router on the basis of Linux operating system. As the results of the evaluation, we confirmed that mobile nodes operated properly according to Mobile IP Protocol.
A clinical correlation between henna hair dyeing and contact dermatitis
( Se Uk Oh ),( Chang Hwa Song ),( Dong Seok Shin ),( Young Wook Ko ),( Jeong Eun Kim ),( Young Suck Ro ),( Joo Yeon Ko ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Pigmented contact dermatitis (PCD) is a noneczematous hyperpigmented type of contact dermatitis. PCD usually involves the face and neck being caused by repeated exposure to cosmetics, especially P-phenylenediamine (PPD). PPD is often found or reported as an additive in henna, which is widely used as a hair dye. Objectives: This study was to investigate the correlation between henna hair dyeing and PCD or allergic contact dermatitis (ACD). Methods: We performed a retrospective study of 6 patients diagnosed as either PCD or ACD with history of hair dyeing. All of them underwent patch testing including henna ingredient. Results: All of the patients with PCD or ACD had hair dyeing history more than 10 years. Forehead, temple, and zygomatic area were common sites of PCD. Our representative case of PCD patients revealed slate-grey reticulate hyperpigmentation with histopathologic findings of pigmented melanophages in dermis. According to patch test results, five of the patients were positive for Nickel and Cobalt. Two of them were positive at PPD. Also, all patients revealed positive results (one case of 2+, four case of 1+, one case of +-) in pure henna powder regardless of the presence of PCD. Conclusion: Our study showed the clinical correlation between henna hair dyeing and PCD, a rare type of ACD. We suggest to do patch testing or the use test for those who dye frequently for preventing PCD.
Effects of Twisting Training on Middle-Aged Normal Weight Obese Women
Se Uk Oh,So-Hee Park,Hyon Park 한국생활환경학회 2018 한국생활환경학회지 Vol.25 No.6
Normal weight obesity (NWO) is a new definition of obesity that in which a person’s body mass index (BMI) is normal (< 25) but percentage of body fat (%BF) exceeds 30%. Middle-aged women show a high prevalence of obesity with age until sarcopenia occurs. Thus, this study selected 13 middle-aged women (39 ± 3 yr) and divided them into two groups (NWO: n=6; Normal: n=7) based on %BF to investigate the effects of 8 weeks twisting training on physique, body composition, isokinetic strength, and physical fitness. Both groups participated in the same twisting training program 3 times per week. The objective of this study is examining the effect of twist training that stimulates mainly on lower body, storing a large fat proportion in middle-aged women. According to the results found in this study, the NWO group had significant improvement of waist circumference (WC), waist-hip ratio (WHR), muscle strength in flexion, extension of trunk, leg flexion, and muscle endurance in leg extension (p<.05). However, there is no significant difference in other variables. In conclusion, twisting training had a positive effect on WC, WHR, and isokinetic strength, while no benefits were found in body composition and physical fitness.