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.

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.

등속성 운동이 노인 여성의 하지근력에 미치는 영향

조재혁,이승훈 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study is to find whether isokinetic training has a good effect on decrease of the lower limbs muscular strngth caused by aging and find the isokinetic training Speed which has a good effect on muscular strength. The subjects of this study are 16 elderly women aged from 61 to 65. The subjects were distributed into two groups, low-speed isokinetic training program group(n=8) arid high-speed isokinetic training program group(n=8) respectively. The subjects of two groups participated in lower extremities isokinetic training program three times a week for 12 weeks. Changes of the lower limbs muscular strength after training were analyzed through repeated measures anova. Results of this study are following: 1. Change of knee extension isokinetic peak torque at the 60˚/ sec in the LS group after 12 week training was significantly different form HS groups. There was no significant difference in knee flexion peak torque among groups. 2. Change of knee extension isokinetic peak torque at the 180˚/sec in the HS group after week training was significantly different form LS groups. There was no significant difference in knee flexion peak torque among groups.

ELASTIC BAND 운동과 스트레칭 운동이 노인 당뇨환자의 혈당, 중성지질 및 근지구력에 미치는 영향

조재혁,이승훈,진종현 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this study s to find the effects of elastic band exercise and stretching exercise on glucose level, triglyceride and muscle endurance in elderly patient with NDDM. The subjects consisted of elderly patient(n=20) with NlDDM dstributed into resstance training group(n=10) and stretching exercise group(n=10). Both groups participated in resstance training and stretching exercise program respectively, 3times per wear during 9weeks. Repeated measures ANOVA was used for statstical analysis. The results of this study are following. 1. Glucose level of both groups decreased significantly after 9 weeks training. There was significant differences between groups in FBS and no significant differences between groups in PP2 after training. There was significant differences in PP2 at time and no significant differences in FBS at times. 2. There was significant decreases in triglyceride level of both groups after 9 weeks training, however no significant differences showed between goups. There was no significant differences between groups at time. 3. Muscle endurance of both groups increased after 9weeks training, however no significant differences showed between groups. There was no significant differences between groups at time.

유압 굴삭기의 크레인 작업시 전도 안정성에 관한 연구

엄혁,최종환,김승수,양순용,이진걸 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4

In this paper, the dynamic stability of a hydraulic excavator using ZMP concept is considered. When a load is moved in an excavator based on automation, an excavator often loses the stability and falls over. This is because a dynamic element is not included in the moment equilibrium equation that is used in order to judge a reversal. Consequently, reversal distinction algorithm including all a static and a dynamic element along a load movement in crane work is necessary. Zero Moment Point(ZMP) is a point on the floor where the resultant moment of the gravity, the inertial force of the manipulator and the external force is zero. This study is going to interpret the reversal stability of the excavator to which is applied ZMP concept through simulation.

다가야스병에 의한 돌연사 부검 1예

이재혁,조승제,박종태 大韓法醫學會 1994 대한법의학회지 Vol.18 No.1

A 22-year old male patient was admitted to the Emergency room of local clinic because of the stuporous mental status. On physical examination, he appeared as a chronically ill, slender man. There was complete absence of the left arm pulse, and a prominent thrill and briuts were present over the right subclavicular area. The blood pressure which checked in the other regions except for the left arm was hypertensive(right arm 180/100, right leg 210/120, and left leg 200/130mmHg). An x-ray film of the chest and doppler ultrasounds showed characteristic dilatation of aortic arch, ascending aorta and innominate artery. The clinical impression was Takayasu's disease. This patients's condition deteriorated rapidly in spite of intensive care and died on the seventh hospital day. At autopsy, the cause of death was massive left brain infarction due to middle cerebral artery embolization. The opened luminal surface of the aorta and its major branches revealed irregulary thick-walled, tree-bark-like appearance. Also in the left common carotid artery, the lumen was nearly obliterated by thromi and intimal fibrous plaques. But the thoraco-abdominal aorta was spared. Microscopic examination disclosed granulomatous and sclerosing arteritis. In the former, the inflammatory process was confined to the media and adventitia and the cell infiltrate consisted predominantly of lymphocytes, plasma cells and histiocytes, with a varying number of giant cells. The latter was characterized bland intimal fibrous hyperplasia, medial degeneration with disrupted elastic lamella, and adventitial fibrosis. The pathologic diagnosis was Takayasu's disease of type I.

응급의학과로 내원한 환자중 내원시 예상치 못했던 사망에 대한 고찰

김승렬,김상은,양혁준,정호성,박철완,이 근 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Patients die in the emergency department frequently ; however, there has been little about the incidence and cause of Emergency Department death in the emergency medicine literature. This study was conducted retrospectively to gain insight into the patients who die suddenly and unexpectedly in the Emergency Department(ED). A total of 360 patients were pronounced dead in the ED from 1991 through 1994 in Chung Ang Gil Hospital. Of the 360 patients, 309 (86%) were brought to the ED with cardiopulmonary resuscitation in progress or as do not resuscitation(DNR) patients, leaving 51(14%) patients who met the unexpected death criteria. Of the unexpected deaths, 32(62.7%) patients presented to the ED with either abnormal vital sign (24 of 32) or some alteration in consciousness (18 of 32), or both of them (10 of 56). Medical and surgical causes of death represented 47.1% (24 patients) and 15.6% (8 patients) of the unexpected deaths respectively. Trauma represented 19 (37.3%) of the unexpected deaths, with 14 of these being the result of motor vehicle collision. The yearly incidence of unexpected ED death is presented in numbers of deaths per 10,000 ED visits. In 1991, the incidence was 3.4, and in 1992, 1993 and 1994 those were 2.7, 2.2 and 2.1 respectively.

클로르헥시딘 바니쉬의 적용이 교정용 브라켓의 전단접착강도에 미치는 영향

임동혁,김태우,장영일,남동석,양원식,백승학 대한치과교정학회 2000 대한치과교정학회지 Vol.30 No.2

본 연구의 목적은 클로르헥시딘 처리가 교정용 브라켓의 전단접착강도와 탈락 양상에 미치는 영향을 비교하는 것이다. 실험군으로 4주간 4회의 클로르헥시딘 바니쉬를 도포한 22개의 사람 소구치를 선택하였고, 대조군으로 아무 처리도 하지 않은 22개의 사람 소구치를 선택하였다. 모든 치아는 37%의 phosphoric acid gel로 부식시키고 교정용 브라켓을 같은 조건으로 부착시켰다. 전단접착강도의 측정을 위해 Instron universal testing machine(model 4466)을 이용하였고, 법랑질과 브라켓 표면은 SEM으로 관찰하였다. 결과의 분석은 t-test를 이용하였으며 결과는 다음과 같다. 1.클로르헥시딘의 법랑질 처리는 전단접착강도에 영향을 미치지 않았다. 2.클로르헥시딘으로 법랑질을 처리한 경우와 그렇지 않는 경우에 브라켓 탈락 양상에 차이가 없었다. 따라서, 클로르헥시딘으로 법랑질을 처리하여도 브라켓 접착에 유해한 작용이 없었고, 따라서 임상사용에 적합하다고 생각된다. The purpose of this study was to determine whether the application of chlorhexidine varnish affects the shear bond strength and failure pattern of orthodontic brackets or not. The experimental group consisted of 22 human premolars which extracted after chlorhexidine vanish application(4 times for 1 week interval) in vivo, and the control group consisted of 22 human premolars which extracted without any pre-treatment. After all teeth were etched with 37% phosphoric acid gel, metal orthodontic brackets (Q-3002, RMO, USA) were bonded to each tooth using auto-polymerizing orthodontic resin (Ortho-One, Bisco, USA) with the same bonding procedure. The shear bond strength was measured with Instron universal testing machine (model 4466, Instron Ltd., England), and the failure pattern of each bracket was examined with Scanning Electron Microscope (SM 840A, JEOL, Japan). The data were analysed statistically with t-test. The results were as follows : 1.Application of chlorhexidine varnish had no significant effect on the shear bond strength of the orthodontic bracket. 2.There was no significant difference in the failure pattern of orthodontic bracket between the experimental group and the control group.

CdSiP₂Chalcopyrite의 고유치와 Raman Shift의 계산

임승혁,정호용,정윤근 麗水水産大學校産業技術硏究所 1995 産業基術硏究所 論文集 Vol.4 No.-

The equations of motion of CdSiP₂with chalcopyrite structure are formulated by using the harmonic approximation method. The force constants are used to two first-neighbor central and one second-neighbor angular force constants following Bettini. With these force constants, dynamical matrix can be obtained. The secular equations constructed from this dynamical matrix are solved by software called mathematica. In this study, we calculated eigenvalue and Raman shift in CdSiP₂chalcopyrite, these are compared with the experimental Raman shifts and Bettini's. Our results explain the Raman shifts fairly good.

비행시험 기법 : 스핀 SPIN

나승혁,이주하 한국항공운항학회 1994 한국항공운항학회지 Vol.2 No.-

본 연구 논문은 항공기 개발에 있어서 비행시험의 최종 단계라 할 수 있는 스핀시험의 정의, 스핀 시험방법 및 스핀 진입시의 회복방법과 실제 비행에서의 스핀 특성으로 스핀에 대한 안전성 제고 및 비행시험의 중요성을 논하였다.