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河永昊 慶北大學校 醫科大學 1970 慶北醫大誌 Vol.11 No.2
The direct effect of histamine on renal function in anesthesized dogs were studied. Mongoral dogs weighing 10∼12㎏ were anesthetized with 30㎎/㎏ of pentobarbital sodium. The right femoral artery and vein were cannulated with polyetylene tubing to facilitate withdrowal of blood samples and infusion of fluids, respectively. Both ureters were cannulated with polyethylene tubing and urine from the right and left kidneys was collected separately. The right kidney served as a control. Into the left renal artery a 22-gauge needle was introduced for histamine administration. The animals were hydrated, intravenously, by a sustaining infusion of 0.9% saline, containing 0.2% of inulin so that the rate of glomerular filtratin could be estimated, at the rate of 0.3ml/㎏/min. Para-aminohippuric acid (PAH) (0.4㎎/㎏/min) was added to the latter of infusion so that the rate of renal plasma flow could be estimated. The urine were colleted from the period of 90minute after initiation of infusion of saline. In this studies the dogs were divided into six groups, consistion of five dogs each, according to dose and drugs used. GROUP 1. (control): 0.9per cent NaCl solution were infused into left renal artery, GROUP 2. (histamine 0.1 ug group): histamine 0.1 ug/㎏/min. were infused. GROUP 3. (histamine 0.5 ug group): histamine 0.5 ug/㎏/min. were infused. GROUP 4. (histamine 1.0 ug group): histamine 1.0 ug/㎏/min. were infused. GROUP 5. (histamine 1.5 ug group): histamine 1.5 ug/㎏/min. were infused. GROUP 6. (histamine+Furosemide group) histamine 0.5 ug/㎏/min with furosemide 10ug/㎏/min. were infused. Histamine in normal saline solution were infused into the left renal artery and comparison of urinary output, renal plasma flow (RPF), glomerular filtration rate (GHR), urinary sodium and potassium of both kidney were made. The results obtain in this study were as follows: 1) In histamine 0.1 ug group, urinary output, renal plasma flow (RPF), glomerular filtration rate (GFR) urinary sodium and potassium were increased slightly, but in the groups of histamine 0.5 ug and 1,0 ug increased markedly on the histamine injected side. 2) In histamine 1.5 ug group. urinary output, RPF, urinary sodium and potassium of histamineinjected side were increased markedly, but these of the other side were decreased only slightly. 3) In histamine+Furosemide group urinary output, RPF, GFR, urinary sodium and potassium of the injected kidney were increased and those diuretic action of furosemide and histamine shows additive.
프레임간 움직임 중복성을 제거한 움직임 추정 및 부호화
하영호,박길흠,정재철 경북대학교 전자기술연구소 1993 電子技術硏究誌 Vol.14 No.2
Method of motion estimation removing redundacy of motion vector between frames and coding method to difference of motion vector between frames are proposed. The former can reduce time of motion estimation by no obtaining motion vectors about blocks of no motion oar small motion. The latter can improve coding efficiency over coding method to difference vector between neighbor blocks within frame.
하영호,윤형기,김정엽 경북대학교 전자기술연구소 1994 電子技術硏究誌 Vol.15 No.1
An object color can be looked differently under the different ambient illuminants. But human color vision system have color constancy that object color can be perceived constantly under the different ambient illuminants. In this paper, we proposed the method restores correct colors under the non-uniform illumination. By considering the local area characterestics, we estimated illuminant direction, hue and strength in non-uniformly illuminated image. We compensated illumination effect based on the estimation of illuminant characterestics and proposed the method that restores object color correctly.
하영호,권영담,심재창,김수중 경북대학교 전자기술연구소 1994 電子技術硏究誌 Vol.15 No.1
Automatic recognition of seal imprint is required for the objective, precise, and fast verification of seal imprint. However, full automatic system is difficult to be implemented, so that man and computer interface system can be expected to have better result. In this paper, center projection method is proposed to verify seal imprint and implemented with man-computer interfaces. Automatic threshold method using CDF is also proposed to omit the normalization process required in the preprocessing step. Experimental results show good performance on classification and recognition of seal imprint.
계층적 영상 부호화를 이용한 인터넷에서의 화상 회의 시스템 구현
하영호,조유제,허상진 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.1
In this paper, we implement a video conferencing system for Internet in Windows 95 environment at PC. This video conferencing system uses RTP(Realtime Transport Protocol) and MBone(Multicast Backbone) for more efficient multiparty video communications. Also, MMG(Multiple Multicast Groups) concept is employed in order that each layer of encoded video stream is broadcasted on the MBone using different IP muticast adds. The receiver can play out video stream using optimum number of IP multicast channels according to network congestion status.
하영호,김영모 한국통신학회 1987 韓國通信學會論文誌 Vol.12 No.6
새로운 窓(Window)함수로 w(t)=0.62-0.48t+0.38cos2$\pi$t, t1/2 가 제시되어 기존 窓들과 성능을 비교하였다. 제안된 窓은 Bartlett, Hanning 및 Hamming 窓들과 유사한 郡에 속하나 그들의 특징을 상호 조합한 특성을 나타낸다. A new window is introduced. It is shown that the window, w(t)=0.62-0.48 t +0.38 cos2$\pi$t. Is of the group having similar but trade-off properties with the Bartlett, the Hanning and the Hamming windows.
교번 간축 알고리즘에 기반한 움직임 추정기의 VLSI 설계에 관한 연구
하영호,정해관,홍춘표 대한전자공학회 1996 CAD 및 VLSI 설계연구회지 Vol.5 No.1
A VLSI architecture of the block matching algorithm based on the alternative subsampling method for the motion estimation is proposed. The alternative subsampling method reduces the computational complexity by alternatively subsampling the number of pixels within the Mocks used to estimate motion vectors, whereas conventional non-exhaustive search methods limit the number of locations searched. The proposed architecture use half number of PEs (processing elements) and achieves approximately 1.6 times of speedup compared to Yang's one. Simulation results show that the performance of block matching algorithm based on tile alternative subsampling is very close to full search algorithm,