무선 애드 혹 기반 액티브네트워크상에서 QoS지원에 관한 연구

李基源,裵振勝,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 thesis, we propose a QoS supporting method on wireless ad hoc-based active network for improving reliability. On the loss of route path, the existing DSR routing protocol has several problems with wireless network communication because of decease of data reception rate and increase of network load. The proposed method improves reliability of data transfer by using functions of active network. That is, by using functions of active nodes and active packets, the proposed method supports QoS with reservation transfer method that saves data packets on transfer at intermediate nodes with lost path and then re-transmit the packets after route reconfiguration.

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.

精神分裂病에서의 血小板 Monoamine Oxidase 活性度와 血漿 Estradiol, Progesterone 및 Testosterone의 相關關係에 關한 硏究

金種億,李定均,禹鐘仁,朴贊雄 大韓神經精神醫學會 1984 신경정신의학 Vol.23 No.1

The hypothesis that certain central dopaminergic systems may be overactive in schizophrenia has quite generally accepted by many investigators. Studies of monoamine oxidase (MAO), the major degradating enzyme of biogenic monoamine, have provided a focus for recent biological in schizophrenia. This study was set up to determine the alteration of platelet MAO activity and its sexual differences, the change of plasm sex hormone levels and the correlation between platelet MAO activity and plasma sex hormone levels, in 130 schizophrenics, comparing with 197 normal healthy subjects. Platelet MAO activity was determined fluorometrically by the modified method of Kraml, measuring the deamination of kynuramine to 4-OH quinoline, and was expressed as nanomoles of quinoline produced per milligram of platelet protein per hour. At the same time, plasma estradiol, progesterone and testosterone levels wers determined by radioimmunoassay technique, Following results were obtained. 1. Platelet MAO activity is not different in acute schizophrenics, but is low significantly in chronic schizophrenics (63.7% of normal control group). 2. Platelet MAO activity is lower in male chronic schizophrenics(56.06% of control group) than female(64.69%), and the sex difference is significant. 3. Plasma estradiol level is significantly low in male chronic schizophrenics(71.82%). 4. The correlation coefficient between platelet MAO activity and plasma sex hormone levels reveal negative correlation between platelet MAO activity and plasma testosterone level in female chronic schizophrenics. From the results of the study, it is strongly suggested that the sex difference of platelet MAO activity in chronic schizophrenia is related to the alteration of plasma sex hormone levels.

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.

클럽 샤프트(Club Shaft) 특성에 따른 골프 스윙(Golf Swing)동작 분석

김성일,김기형,김형수,이현섭,김진욱,안찬규,김희진 한국운동역학회 2002 한국운동역학회지 Vol.12 No.2

본 연구는 클럽 샤프트의 대표적인 재질인 그라파이트(graphite)의 유연한(flexible) 클럽 샤프트(club shaft)의 특성에 따라 피험자가 운동학적(kinematics) 요인이 되는 관절의 각변위, 각속도, 각가속도, 클럽헤드의 속도와 가속도와 같은 변인들이 어떻게 적응하는지 비교 분석하여 보다 효율적인 드라이버 선택에 도움을 주며 샤프트 특성에 따른 신체관절의 움직임에 대한 자료를 제시하고자 하였다. 고속 카메라 2대의 속도는 500fps로 하였고 각 regylar,stiff, x-stiff, 자신의 클럽을 포함 각 4개의 클럽을 사용하여 각 클럽당 3번씩 촬영하였으며 목표방향에서 20m이상 벗어나는 경우의 촬영은 다시 촬영하였다. 본 연구에서는 디지타이징(digitizing)을 신체 9개 마커는 강체로 가정된 클럽과 신체분절 모델로 정의하였으며 2 대의 카메라(500fps)로부터 얻은 avi화일을 컴퓨터에 저장하고 자료로부터 Butterworth 6th order recursive digital filter를 사용하여 1차 자료를 smoothing 하고 DLT를 이용하여 3차원 좌표를 구성하도록 한다. 좌표값을 얻기 위하여 kwon3d v3.0을 이용하였다. 본 실험은 피험자 스스로 클럽의 특성에 따라 스윙의 속도를 달리 하기 때문에 스윙의 시간이 달라지며 어느 정도 클럽이 강성에 따라 스윙시간이 빨라지는 결과로 나타났다. 이것은 피험자가 샤프트가 강성(stiffness)에 따라 스윙 속도를 빨리 하게 되는 원인이 되는 것으로 생각된다. 어깨의 각변위는 클럽이 regular의 경우 임팩트에서 각속도를 계속 유지하고 있으며 stiff, x-stiff의 경우에는 어깨의 움직임이 임팩트에서 급격하게 감소되는 것을 알 수 있다. 이것은 팔의 동작과 클럽의 힘을 크게 하기 위한 동작으로 생각된다. 어깨 각속도는 클럽이 stiff할수록 각속도가 큰 감속하는 것으로 나타났다. 손목속도는 regular 클럽의 경우 손목의 감속이 늦게 되고 임팩트에서 손목의 감속이 적게 하는 것으로 나타났으며 stiff와 x-stiff의 클럽에서 임팩트 시에 순간적인 감가속으로 인해 클럽의 속도를 증가시키고 있다. 임팩트 시에 손목의 감가속은 클럽헤드의 임팩트 시 속도를 증가시키는 결과를 보였다. 클럽헤드는 regular 클럽이 임팩트전에는 속도 증가가 커지는 결과와 일치된 결과를 보이고 있다. The purpose of this study was to find the rational method to analyze golf swing with specific property of club shaft. Three subjects were filmed by two high speed digital cameras with 500fps. The phase analyzed was downswing of each subject. The three-dimensional coordinates of the anatomical landmarks were obtained with motion analysis system Kwon3d 3.0 version and smoothed by lowpass digital filter with cutoff frequency 6Hz. From these data, kinematic and kinetic variables were calculated using Matlab(ver 5.0) The variables for this study were angular velocity and accelerations, which were calculated and following conclusions have been made : 1) Golf swing time of stiff club is faster than that of regular club. 2) In shoulder joint motion of swing with the stiff club, x-stiff showed mort rapid negative acceleration than that of regular club. 3) In regular club, the velocity of club head would be more effective velocity, which was increasing, than those of other clubs before impact. 4) In wrist joint motion of swing with stiff club, x-stiff club showed faster than regular club in the downswing and impact more rapid negative acceleration.

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.

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.

임베디드 시스템에서 Mobile IP 프로토콜 구현

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.

Safety of Anti TNF Therapy in Patients Receiving Anti Hepatitis B Drug

( Chan Uk Lee ),( Ji Hoon Kim ),( Young-sun Lee ),( Jong Eun Yeon ),( Kwan Soo Byun ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: There were insufficient previous studies on the use of anti TNF therapy during anti Hepatitis B drug treatment. This medical record review assessed the safety of anti TNF therapy in 4 patients with inflammatory bowel disease, ankylosing spondylitis and during nucleos(t)ide analogues(NA) treatment. Methods: A retrospective analysis of patients treated with anti TNF during NA treatment was conducted. The primary outcome was markers of hepatitis B reactivation, including aspartate aminotransferase, alanine aminotransferase, and hepatitis B viral load at each follow up visit. Results: In total, 7 patients with surface antigen positive were included in the study: 3 inactive carrier and 4 were being treated by NA. At baseline, 6 patients had normal liver function tests and low or undetectable HBV DNA levels, except for 1 patient with short NA administration period. Three patients received with tenofovir, and 1 received treatment with entecavir. In 4 patients with NA treatment, the HBV DNA titer was not checked or decrease and AST, ALT value remained within the normal limits throughout follwup. Conclusions: Our study provides reassuring data about the safety profile of anti TNF therapy in patients with NA treatment previously. These data are encouraging and should lead to initiation of controlled trials of anti TNF therapy in hepatitis B.

Colorectal Neoplasm in Patients with Pyogenic Liver Abscess: Prevalence, Etiology and Associate Factor

( Chan Uk Lee ),( Ji Hoon Kim ),( Young-sun Lee ),( Jong Eun Yeon ),( Kwan Soo Byun ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: Pyogenic liver abscesses (PLA) is known to be caused by disruption of the colon mucosa with secondary bacteremia via the portal route, as occurs for example in tubular adenoma or colorectal cancer. This large scale population based study aim to investigate clinical characteristics of patients with both colorectal neoplasm and PLA. Methods: We reviewed medical records of 256 patients with PLA who underwent screening colonoscopy but was not diagnosed cancer excluding colorectal cancer by imaging study, from January 2004 to January 2018. Differences between patients with and without colorectal cancer or high grade dysplasia were evaluated in baseline demographics, imaging, pathogens and mortality. Results: Of the total patients, 7.8% (n=20) were diagnosed with adenocarcinoma, 2.3% (n=6) had adenomatous polyp with high grade dysplasia and 16% (n=41) had adenomatous polyp with low grade dysplasia only. More frequent diabetes mellitus was observed in group with colorectal cancer or high grade dysplasia (14/26 vs. 70/230 patients, P=0.026). There were significant differences in serum glucose, HbA1C, hemoglobin, carcinoembryonic antigen and age, hospitalization period, mortality, compared two groups. But no significant differences were found in abscess size, abscess location, liver biochemical test excluding serum albumin. 66.8% of the patients presented growth in culture The most common isolated pathogen were Klebsiella pneumonia but was not differ between groups(15/26 vs. 118/230 patients, P=0.342). Conclusions: We found that the prevalence of colorectal neoplasm among the patients with PLA was similar or higher than other studies. Screening colonoscopy should be considered for colorectal neoplasm in patients with PLA, especially for patients with diabetes mellitus.