근접 적외선 단층영상에 관한 기초연구 ( Feasibility of Near Tomography )

하영호,조진호 대한전자공학회 1986 대한전자공학회 학술대회 Vol.1986 No.1

천마산(경기도)의 식물상

하영호,윤창영,김상철,김주환 한국자원식물학회 2016 한국자원식물학회지 Vol.29 No.1

This study aims to investigate the flora of Mt. Cheonma (Namyangju-si, Gyeonggi-do, Korea), including Korean endemic, rare and endangered plants. To support the biodiversity and usefulness of this investigation, we checked the red list plants, floristic regional indicator plants, climate change adaptation target plants and naturalized plants, and compared composition of plant species in Mt. Cheonma with nearby mountains. Totally, we performed 22 field investigations from April 2012 to October 2014. The number of vascular plants in this region is 433 taxa and comprised of 94 families, 266 genera, 378 species, 2 subspecies, 46 varieties, and 7 forms. Among them, there are 13 endemic plants designated by Korean Forest Service, whereas only 10 taxa are endemic species by Korean Ministry of Environment (KME). According to the IUCN criteria, there are 12 rare and endangered plants composed of 9 Least Concerned (LC), 2 Vulnerable species (VU), and one Endangered species (EN) found by Korea National Arboretum (KNA). Meanwhile, 8 taxa including 7 Least Concerned (LC) were found in Red List of KME. The floristic regional indicator plants designated by KME were 49 taxa. In addition, there are 14 taxa in The Adaptable to Climate Change Plant List designated by KNA, while only 19 taxa are naturalized plants. Generally, there are 190 common taxa in Gwangju Mountains area, and only 51 taxa are distributed in Mt. Cheonma. Key words - Mt. Cheonma, Flora, Vascular plants, Endemic plants, Rare plants 적 요본 연구는 경기도 남양주시에 위치한 천마산의 관속식물상의 조사를 위해 수행되었으며, 이를 대상으로 한반도고유종, 희귀 및 멸종위기식물, 적색식물, 구계학적특정식물종, 기후변화적응대상 식물, 귀화식물을 조사하였고 또한 이미 조사가 이루어진 주변지역의 산과 종 조성을 비교분석하였다. 2012년부터2014년까지 총 22회에 걸쳐 현지조사를 실시한 결과, 94과 266 속 378종 2아종 46변종 7품종의 총 433분류군의 관속식물이 확인되었다. 이 중에서 산림청(국립수목원)이 지정한 특산식물은13분류군이, 환경부지정 고유종은 10분류군이 확인되었다. 희귀 및 멸종위기식물은 IUCN 평가기준에 따라 국립수목원이 제시한 기준에 따라 약관심종(LC) 9분류군, 취약종(VU) 2분류군, 위기종(EN) 1분류군 등 총 12분류군이 확인되었으며, 환경부에서 제시한 적색자료집에 따르면 관심대상(LC) 7분류군, 미평가(NE) 1분류군 등 총 8분류군이 확인되었다. 환경부지정 멸종위기 야생식물 I, II 등급종은 확인되지 않았다. 환경부지정 구계학적 특정식물종은 49분류군이 확인 되었으며, 이 중 정밀생태조사종인 IV등급에 해당하는 종은 도깨비부채, 만주바람꽃, 미역고사리, 점현호색 4분류군이 확인되었다. 국립수목원지정 기후변화 적응대상식물 300종 중에서 14분류군이 확인되었다. 귀화식물은 19분류군이 확인되어 귀화율 4.3%, 도시화지수 5.9% 를 보였다. 광주산맥내 위치하는 산인 축령산, 화악산, 명지산과 비교하여 190분류군이 공통적으로 분포하였으며, 51분류군은 천마산에서만 확인되었다.

Histamine의 腎機能에 미치는 影響에 關한 硏究

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.

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.

중심투영법을 이용한 인영검증 시스템의 구현

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.

칼라항상성을 이용한 영상향상

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.

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,

광센서를 사용한 TV 화상의 색 향상

하영호 경북대학교 센서기술연구소 1996 센서기술 Vol.3 No.2

지능형 마그네틱 베어링

하영호,이종원 대한기계학회 1994 大韓機械學會誌 Vol.34 No.10

이 글에서는 마그네틱 베어링의 일반적인 특성, 국내외의 연구동향 및 응용추세, 능동형 마그네틱 베어링의 각종 제어 방법에 대하여 기술하였다. 특히 능동형 마그네틱 베어링은 부하능력이 크고 신회도가 높을 뿐만 아니라 상황감시 및 진단 기능과 상황 적응기능을 갖는 지능형 마그 네틱 베어링으로도 이용될 수 있기 때문에 응용 분야가 확대되고 있고 일부 제품은 이미 실용 화되었다. 앞으로 마그네틱 베어링의 고성능화, 소형화, 생산 및 운용 비용 절감을 위한 연구와 특정한 분야에의 응용을 위한 연구가 국내외에서 활발히 진행될 것으로 예상된다.

변형된 상승여현창의 제안과 기존창들과의 특성 비교

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.