802.11e 매체접근제어 프로토콜에서 트래픽의 발생률에 따른 EDCF의 종단간 전달 지연 특성 연구

변태영,조무호 경주대학교 정보전자기술연구소 2003 情報電子技術論叢 Vol.2 No.-

In this paper, we analyze the end-to-end path delay in the EDCF mode of 80211e network which provide QoS control capability in the wireless LAN environment. As described in 80211e specification, under the EDCF operation, the realtime traffic such as streaming service, VoD service with high priority get more frequent chance to transmit frames than that of low priority traffic. To verify these characteristic, we implemented a simulation tool which support the 80211e MAC and measured the characteristics of the end-to-end path delay among various traffic streams. The simulation results showed that the delay of traffic with high priority is supported with a QoS guarantee, but the traffic with low priority experience a great delay as the number of mobile terminal is above a point which is regarded as threshold.

비만 여성을 대상으로 한 해조류 추출물의 국부처치와 운동 병행을 통한 지방분해 효과의 임상적 검정

서태수,이인숙,변재철,김규호,박승한,김유영,김상국,김현정,김상기,신동철,성미영,박종석,김종기,박언휘 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3

This study was carried out to test the body fat breakdown during topical seaweed extract treatment and in combination with the aerobic exercise. Of 20 female obesity subjects, ten treated a cream types of seaweed extract(control group) and ten treated a placebo cream(placebo group). Topical treatment of each sample was designed for 4 weeks, and treated with 2 times a day about 10ml on the abdomen and the thigh, respectively. All subjects were participated aerobic dance half hour a day and four times a week. After 4 weeks of topical treatment and exercise, they were measured body fat, skinfold thickness, body circumference. Then venous blood samples were taken and analyzed blood cells, serum enzymes, and serum lipids. There were reduction of body weight, % of body fat, antebrachium, brachium, chest, waist, thigh circumference and abdomen thickness between pre and post treatment in both group. Especially, body weight and % of body fat significantly reduced in the subjects treating the seaweed extract than those treating the placebo. There were significant decrement in total cholesterol and LDL whereas increment in HDL and TBIL in the control group, but no significant difference in the placebo group. In conclusion, there were 7.6% of body fat reduction during 4 weeks of aerobic exercise and 21% of body fat reducement in combination of topical seaweed treatment and exercise, respectively. These results suggest that the topical treatment of seaweed extract should be very effective for fat breakdown. Especially, the body fat breakdown maximized in the combination with the topical seaweed extracts treatment and the aerobic exercise.

IEEE 802.11e MAC 계층에서의 QoS 제공을 위한 스케줄링 방안 연구

조무호,변태영 경주대학교 정보전자기술연구소 2003 情報電子技術論叢 Vol.2 No.-

The future information service paradigm will move from the concept that one should search in the information space to the new concept that one gets more accurate information just where there are. Within this paradigm, a new group of information device, called next generation mobile terminal will take a major trend instead of the fixed legacy terminal. The main difference of the next generation mobile terminal is to provide the multimedia service efficiently with various bandwidths at any time, at any place and with any person. Thus the next generation mobile terminal should be a common mobile platform to provide the multimedia service such as VoIP(Voice of IP), video streaming service and e-mail. These multimedia services require various channel resources according to the traffic class, and can make differences in performances according to the channel resource management mechanism And mobile data service terminal can provide multimedia service in the wire and wireless network environments. These requirements mean to provide a minimum QoS (Quality of Service) in case of the terminal roving the wireless networks of different bandwidths and different error rates. To support the end-to-end QoS services in the next generation mobile terminal, the wireless access part takes into account first of all due to insufficient resources and technical limitations. In this research, we study the scheduling methods at the medium access control (MAC) layer to support QoS in IEEE 80211e.

Indoor short track speed skating 500m, 1000m 滑走時 運動强度에 關한 硏究

李正秀,曺泰浩,柳喜男,卞宰文 경희대학교 체육과학연구소 1985 體育學論文集 Vol.13 No.-

(Conclusion) With 4 Indoor short track topped skating players of junior as the subjects, this research was made in order to reveal the degree of work intensity by measuring how %H.R max would change when they do the skating 500m, 1000m. The results are as follow. 1.Work intensity of 500m skating. Mean H.R was appeared 161.25 ± 10.88 beats/min, %H.R max was 76.02% as 500m skating, H.R max as 500m skating was appeared 174.00 ± 9.90 beats/min,% H.R max they had skated. 2.Work Intensity of 1000m skating. Mean H.R was appeared 166.88 ± 17.92 beats/min,% H.R max was 80.64%, as 1000m skating, H.R max was appeared 183.75 ± 6.34 beats/min,% H.R max was 94.48% as they had skated 1000m. 3.Correlation coefficient and regression line equation between H.R max and speed as skating. Correlation coefficient was seen certainly as 0.467 between H.R max and speed, was at the level of 1% (P < 0.01), Sy. x was placed nearly on the regression line, regression equation was appeared Y = 0.05x-0.81. (Suggestion) As 500m, 1000m skating are end within short time, they have to progress the technique and work capacity so that they are able to exhibit the speed within short time after start.

졸-겔공정을 이용한 초고용량 캐패시터용 Nickel oxide 나노입자의 합성

김두현,송기창,변태강,송연호 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.2

The Ni (OH)₂ nanoparticles with average diameter of 50 nm were synthesized by hydrolyzing nickel acetate with water, and were dispersed in the distilled water to prepare the coating solution. The electrodes for supercapacitor were prepared by dip-coating the coating solution on the Ni-foam. The electrodes heat-treated at several temperatures showed the highest specific capacitance, 160 F/g, at 250℃. It can be explained that the Ni(OH)₂ particles heat-treated at 100 and 200℃ on the electrodes contained the impurities such as acetate groups in the pores, and resulted in low specific surface areas. However, as the calcination temperature increases. the impurities incorporated in the pores are removed at 250℃, and thus, the particles on the electrodes show the highest specific surface area (177 ㎡/g).

비침습적 검사를 이용한 수술후 하지 심부 정맥 혈전증의 감시

김영욱,정한준,윤봉호,김신윤,이상국,변경환,김태헌 경북대학교 병원 1997 경북대학교병원의학연구소논문집 Vol.1 No.1

Deep vein thrombosis is recognized as a common complication in surgical patients in western countries especially in patients with high risk factors. The purposes of this study were to detect leg DVTs in early postoperative period by non-invasive surveillance and to analyze the risk factors of DVT. One hundred seventy one patients who underwent major operations(67 curative resection of colorectal cancer, 64 total hip replacement, 38 femur operation for fracture, and 2 colon resections for benign colon disease) were included for the prospective surveillance of leg DVT within 2 weeks after the operations. For the surveillance of leg DVT, strain gauge plethysmography(SPG) and Duplex scanning of both legs were completed for all patients except 10 patients. These 10 patients were examined in only one leg. The patients with past history of leg DVT or under prophylactic anticoagulant therapy were excluded from this study. To determine the risk factors related with leg DVT formation, age and sex of the patients, indication of surgery or surgical procedures, duration of operation, position during the operation, duration of postoperative immobilization, and preoperative serum level of antithrombin III (AT- III) were analyzed using Chi-square test. After performing SPG of 342 legs, 38 legs, showed abnormal on venous outflow/venous capacitance discriminant line chart, and 13 legs of 12 patients showed the finding(s) suggesting DVT on duplex scanning. Among the patients with abnormal duplex findings, 7 limbs(53.8%) were symptomatic, but the remaining 6 legs were silent. In 6 (15.8%) patients of 36 femur operations, 3(4.7%) of 64 total hip replacements and 3(4.5%) of 67 curative resections of colorectal cancer developed DVT by duplex scanning in the iliac(5), femoral-popliteal(6), and isolated calf(2) veins. After analyzing the risk factors, we could not find any statistically significant(p<0.05) factor related with leg DVT.

특발성 확장성 심근증 환자의 임상적 소견의 관찰 : 남녀 성별에 따른 차이를 중심으로 Comparison of Sex difference

이광희,김철현,최태명,이성우,김성구,권영주,변재호 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.1

특발성 확장성 심근증에 대한 진단 및 연구는 이전에 주로 관혈적인 좌심실조영술이나 부검에 의해 이루어져 연구가 많이 않았으나 최근 심초음파도의 보편적인 이용으로 진단이 용이하여 이에 대한 임상적 연구가 증가되고 있다. 그러나 남녀 성별에 따른 임상적 소견의 차이에 대한보고는 많지 않았다. 대상 및 방법 : 특발성 확장성 심근증으로 진단받은 환자 68명(남자 37명, 여자 31명)을 대상으로 임상적 소견과 심전도 및 심초음파 검사소견등을 남녀간에 비교 분석하였다. 결 과 1. 유병기간은 여자가 남자보다 유의하게 길었고(p<0.05), 호흡곤란, 심계항진 및 심부전의 빈도는 여자에서 더 많은 경향을 보였으나 통계적으로 유의한 차이는 없었다. 2. 심초음파도상 좌심실 이완기말 내경계수, 심실중격 두께 계수, 좌심실 후벽 계수, 좌심방 내경 계수는 여자가 남자보다 유의하게 컸으나(p<0.01), 분획단축(fractional shorting)은 양군간에 유의한 차이가 없었다. 3. 심전도상 QRS 기간이 여자가 남자보다 긴 경향이 있었으나(p<0.08) 기타 소견은 양군간에 유의한 차이가 없었다. 결 론 : 특별성 확장성 심근증의 임상적 소견 및 검사 소견의 성별에 따른 분석에서 여자에서 질병의 정도가 더 심한 것으로 나타나는 소견이 있었으나 추후에 더 많은 연구및 원인 분석이 필요할 것으로 사료된다. Background : Idiopathic dilated cardiomyopathy(IDC) is a well recognized condition both clinically and morphologically. Despite the relatively frequency of this condition, few studies focusing on sex difference have been reported. Method : A total of 68 patients with IDC(37 men, 31 women)were studied retrospectively. Certain clinical and laboratory findings were analyzed and compared between men and women. Results 1. The women had a significantly(p<0.05) longer mean duration of chronic congestive heart failure than men. 2. Of the echocardiographic findings, index of left ventricular end-diastolic diameter, interventricular septal thickness, left ventricular posterior wall thicknes and left atrial dimension were significantly higher in women than in men. 3. Duration of QRS complex in ECG was longer in women(p<0.08) conclusion Some of clinical and laboratory findins are more advanced phase in women in IDC.

The Effects of Transcriptional and Translational Inhibitors on Maturation of Porcine Oocytes In Vitro

Tae Ho Byun,Sung Eun Park,Sang Ho Lee 한국동물자원과학회(구 한국축산학회) 1992 한국축산학회 심포지움자료집 Vol.- No.-

The Effects of Transcription / Translation Inhibitors on Meiotic Maturation of Porcine Oocyte In Vitro

Byun, Tae Ho,Lee, Sung, Ho,Park, Chang Sik,Lee, Sang Ho 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

Fluorescence in situ hybridization and INT-dehydrogenase activity test to assess the effect of DO concentration in aerobic biofilm reactor

Tae Joo Park,Sung Ho Hur,Jeung Jin Park,You Jin Kim,Jae Cheul Yu,Im Gyu Byun,Tae Ho Lee 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.1