강제치환 거동특성에 관한 원심모형실험

이종호,박병수,정길수,유남재 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.A

This thesis is results of centrifuge model experiments to investigate the behavior of replacement method in dredged and reclaimed ground For experimental works. centrifuge model tests were carried out to investigate the behavior of replacement method in soft clay ground. Basic soil property). tests were performed to find mechanical properties of clay soil sampled from the southern coast of Korea which was used for ground material in the centrifuge model tests Reconstituted clay ground of model was prepared by applying preconsolidation pressure in 1g condition with specially built model container. Centrifuge model tests were carried out under the artificially accelerated gravitational level of 50g Replacing material of leads having a certain degree of angularity was used and placed until the settlement of embankment of replacing material was reached to the equilibrium state. Vertical displacement of replacing material was monitored during tests. Depth and shape of replacement. especially the slope of penetrated replacing material and water contents of clay ground were measured after finishing tests Model tests of investigating the stability of embankment after backfilling were also performed to simulate the behavior of the dike treated with replacement and backfilled with sandy material. As a result of centrifuge model test. the behavior of replacement, the mechanism of the replacing material being penetrated into clay ground and depth of replacement were evaluated

P2P에서 전자서명을 이용한 정보보호 시스템의 보안에 대한 신뢰성 향상

이정기,김길준 조선대학교 전자정보통신연구소 2003 電子情報通信硏究所論文誌 Vol.6 No.1

정보사회로 진행되어 감에 따라 개인과 개인간의 정보공유 모델인 P2P는 중앙서버가 필요 없이 다른 사용자들과 정보를 주고받을 수 있는 장점으로 지속적으로 발전하고 있다. 또한 정보통신 기술의 급속한 발달과 정보통신망 확산으로 P2P에서 전자문서를 이용하는 전자거래는 증가할 추세에 있다. 그러나 이러한 인터넷을 이용한 전자거래가 우리에게 커다란 편익을 주는 것은 사실이지만 전자문서를 이용한 전자거래는 여러 가지 문제점을 안고 있다. 바로 정보화의 순기능 뒤에 숨어 있는 정보화의 역기능이다. 전자문서를 이용한 정보전달은 비접촉, 비 대변으로 이루어지기 때문에 전달 당사자간에 상대방의 신원확인이 어렵고 타인으로 위장하여 전자문서 등을 부정하게 사용할 위험이 있다. 또한 전자문서는 유통되는 과정에서 위·변조가 용이하고, 문서작성사실을 입증하기 곤란 한다. 이러한 문제점을 해소되기 전에는 P2P에서 전자문서를 이용한 전자거래가 활성화가 어려울 것이다. 본 논문에서는 전자문서를 이용한 전자거래에 있어서 상대방의 신원확인 전자문서의 위·변조 확인 및 문서작성 사실의 부인을 방지하여 전자문서를 안전하고 신뢰성 있게 이용 할 수 있는 여건을 조성 할 수 있도록 공개키 암호기술에 기반을 두는 방식을 사용하여 P2P에서 전자서명을 이용한 전자거래 보안에 대한 신뢰도를 향상시킬수 있도록 하였다.

농어촌 인구 정주에 관한 환경 계획적 연구

정성찬,이길영 大田大學校 環境問題硏究所 2002 환경문제연구소 논문집 Vol.6 No.-

The settlement of population in agricultural areas helps to prevent the influx of agricultural population to metropolitan areas and also contributes to improving residential environments of large cities. Constituting a major pillar to support balanced development of a nation, it can be said to be the key task in regional planning. Recently, Korean agricultural society has gone through a tremendous change. The economic policy of urbanization and industrialization enforced in the 1970's resulted in the concentration of industries and economies mostly in cities, which inevitably led to the phenomenon of so-called "leaving countries for cities." This indicates the outflow of agricultural population from countries into cities. As a result, the development of agricultural regions has slowed down, with the population decreasing and the community becoming empty, in contrast to urban areas. Consequently, agricultural areas are facing a crisis, and it is hard even to maintain them as residential areas. Furthermore, the wide regional gap between cities and agricultural areas derived from the process of urbanization and industrialization is recognized as a big barrier to the efficient use and balanced development of the land of the nation. Therefore, plans of rearrangements of residential environments in the agricultural areas are emergingas an urgenttask, both in revitalization of decreasing agricultural areas and in balanced developmentof the national territory. However, academic investment or developmental policies up to now have been mostly concentrated on cities. Matters of agricultural areas, thus, have been neglected as secondary problems to those of cities. It is essential to view the question of the settlement of agricultural population from various perspectives and to have academic involvement. Yet, the settlement of population, the result of movement, is a very complicated phenomenon originated in the relationships between residents, the subjects of settlement, and the surrounding regional circumstances. These phenomena vary according to the behaviors and attitudes of the residents. And the degrees of satisfaction of the residents differ depending on each individual's value system. Therefore, the attempt to establish the settlement of the agricultural population can be seen in this context. It is the biggest mission, then, to simultaneously examine both aspects, the aspect regarding regional environments and the aspect related to residents, the subjects of settlement. Finally, as mentioned before, it is necessary to note that the attributes and conditions are various both in a macroscopic level involving regions and in a microscopic level involving individuals as subjects of settlement. It is also necessary to investigate the perspectives from which the settlement in the agricultural regions is dealt with in the regional, environmental planning. Obviously, this issue needs be handled with external and internal analyses as it involves both the reality and the ideal of the residents' value system. Therefore, this study is not about simply restoring the past in regard to a series of problems with the settlement of agricultural population. This study aims to pursue the natural essence of agricultural areas in which new agricultural regions and cities can be integrated under the conditions of national territory, and at the same time, to deal with the agricultural areas as new space for settlement.

도심 공원의 음 풍경 디자인을 위한 실험적 연구

이태강,송민정,전지현,장길수 대한건축학회 2005 대한건축학회논문집 Vol.21 No.1

This study is an experimental study to introduce the soundscape design in urban parks Objective 4 urban parks were surveyed And four or three subdivision area in these parks were investigated the sound source frequently to be heard and the degree of satisfaction for visual and auditory atmosphere measuring the sound level in 5 minute subjective response to soundscape for each subdivision area were earned out using 7 scale S D method based on pair of adjectives In order to recognized the effect environment sound (bird Sing, sweet ecological music, and nature sounds)for enriching the present soundscape, this study analyzed the subjective response for soundscape before and after providing environmental sound Result of the evaluation of public perception and their sound were vaned at the each subdivision area, which represented the special characteristics of the urban parks The score for image of the places were always higher than those of the sounds, thus visual Image were affected more positively than auditory image The effect of the environmental sound usually resulted in improvement of the subjective cvaluation at cach subdivision area Factor analyzing of the 25 korean vocabulary for using S D method could be induced the appropriate three factors "impression", "calmness" and "delight" These factors can be used for soundscape design of sound sources and images to provide

A. 高校 科學 (生物·地球科學) 및 數學科 探究學習의 評價模型 定立과 評價紙 開發

李相協,權炳奎,林在圭,孫文求,吳岱燮,楊洪準,梁承榮,姜用熙,林成圭,金正遠,金吉民,兪正在 경북대학교 과학교육연구소 1982 科學敎育硏究誌 Vol.6 No.-

Currently the evaluation of high school science and mathematics learning has been too much knowledge-centered without concerning the inquiring ability or scientific attitude. This study, therefore, was made for the purpose of establishing of evaluation model for high school science (biology and earth science) and mathematics learning and its evaluation items. In this paper, the research was done about three fields, biology, earth science and mathematics. 1. For the biology, the evaluation methods of inquiry learning were studied with the foreign references, and proper evaluation items were suggested. 2. For the earth science, after analizing 5 kinds of earth science textbook of current using in high school, essential 19 items were selected. 5 of them were tested in test group and control group, then, the results were analized. 3. For the mathematice, the teaching elements of「Set」and「Flow chart」in mathematics (Ⅰ) were selected and structured. Detailed teaching objects were established and evaluation items were introduced.

음원 방향각 추정에 관한 계산기 시뮬레이션

이채봉,김정국,김길중 東西大學校 1998 동서논문집 Vol.4 No.-

In this paper describes the optimum beamforming algorithm when it estimates source signal localization. It is proposed many methods for the identification of a sound source localization. But in this study, compares and ivestigates the angle resolution and sharp peak value by the simulation. The simulation perform to each of DSA(Delay Sum Arry), MV(Minimum Variance), MUSIC(MUltiple SIgnal Classification) method when signals with two or three frequency exist. In result, the MUSIC method has excellent angle resolution and sharp peak value in estimating the derection of arrival signals at each microphone for arbitrary direction of the sound source singnal.

崩積土의 風化度가 自然斜面의 進行性 崩壞에 미치는 影響

鄭斗永,崔吉烈,李廣俊 全北大學校 1990 論文集 Vol.32 No.-

This study is an investigation of the influence of weathering degree on progressive failure slope. The clay mineral is kaolinite in failure soil layer which distributed in Granite - Schist rock zone of the Mesozic era and the thick of it is less than 3mm in heavy weathered soils, and so the failure form is friction type. The failure layer is sandy soils which have limited influence elements in sliding movement, and so the failure type is collapse type and bed rock failure type. The relationship between Ig-loss and saturation degree is an inverse proportion in characteristics of failure soils, and the saturation degree in laboratory sliding model increase about 78% to 85% and the effective porosity is deduced in 28% to 35%. The steady pore pressure(+) which produced according to rainfall time have more effective elements under the influence of precedent rainfall or concentrating precipitation on pointed day than weathering condition of failure soils, because the heavy weathered layer and rock-cracking layer is non-development state.

혈액투석 환자에게서 발생한 재생불량성 빈혈 1예

정지용,윤나라,강대웅,오종찬,장재현,선길홍,박경희,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.1

Aplastic anemia is a disease characterized by pancytopenia in the peripheral blood and hypocellular bone marrow with the fatty infiltration. The causes of the acquired aplastic anemia were usually related to drugs and immune-related diseases. A 34-years old man was admitted due to general weakness. He has been going hemodialysis for 2 years because of end stage renal disease (ESRD) due to chronic glomerulonephritis. At admission, laboratory tests showed hemoglobin 6.2 g/dL, hematocrit 18.0 %, WBC 5,710mm (neutrophil 71.8%, lymphocyte 19.1%, monocyte 5.9%), reticulocyte 1.9%, platelet 93,000/mm, Fe 12.8 ug/dL, TIBC 204 ug/dL, ferritin 941.47 ng /ml, haptoglobin 0.72 g/L, vitamin B12 508.17 pmol/L, folate 24 ng/mL, total protein 6.54 g/dL, albumin 3.76 g/dL, Alk. pohsphatase 79 IU/L, AST 30.0 IU/L, ALT 39.7 IU/L, total bilirubin 0.57 mg/dl, BUN 79.4 mg/dl and creatinine 10.18 mg/dl. Peripheral blood smear showed the normocytic normochromic anemia with anisocytosis. Anemia was diagnosed but it was irresponsive to the recombinant human erythropoietin (EPO) and blood transfusion. In the bone marrow aspiration smear were there the hypoplastic myeloid and erythroid precursors. The bone marrow biopsy section showed the hypoplasia of all components (10-20%) and the fatty infiltration. We have experienced one case of the idiopathic aplastic anemia in a patient going through hemodialysis and we just report it with documentary records. 저자들은 혈액 투석 중인 환자에서 약물, 면역계 이상등의 원인을 발견할 수 없었음에도 재생 불량성 빈혈이 발생한 1예를 경험하여 문헌 고찰과 함께 보고하는 바이다.

총담관 결찰후 집토끼 소엽사이담관의 미세구조적 연구

이상은,박경호,양남길,안의태,고정식 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

담소관은 담즙의 성분중 수분과 무기전해질의 분비 및 흡수기능을 가지고 있는데, 총담관을 결찰하여 인위적으로 담즙울체를 일으킨 후 담소관상피세포의 미세구조적변화를 알아보기 위하여 본 실험을 시행하였다. 집토끼의 총담관을 결찰하고 1일, 3일, 5일, 7일, 및 14일이 경과된 후 간조직을 떼어 전자현미경관찰을 위한 통상적인 방법에 따라 고정, 탈수, 포매의 과정을 거친 다음 전자현미경관찰용 절편을 만들어 JEM 100CX Ⅱ 투과전자현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1. 정상 담소관상피세포는 입방형이며, 내강이 커질수록 원주상으로 변하며, 가끔 전자밀도가 높은 세포가 나타났다. 2. 담소관담상피세포의 자유면은 미세융모가 돌출되어 있으며, 드물게 섬모도 관찰되었다. 세포의 위쪽 측면은 폐쇄띠, 부착띠, 부착반을 가진 연접을 이루었으며, 아래 쪽은 미세주름이 나타났고, 기저면은 기저막으로 둘러 싸여 있었다. 3. 총담관결찰 후 담소관은 그 내강이 확장되면서 상피세포의 미세융모의 수는 줄었으며 팽대되었고, 미세사의 증식이 현저하였다. 4. 총담관결찰 후 담소관상피세포 사이의 부착띠가 더욱 발달되는 경향을 보였다. 5. 총담관결찰 후 담소관상피의 기저막은 부분적인 파괴가 관찰되었다. 이상의 결과에서 미세융모의 감소, 내강의 확장 및 기저막의 부분적인 파괴등은 담즙울체로 인하여 담관내의 압력이 증가하므로 나타나는 담소관상피세포의 형태적 변화라 생각된다. The bile ductule is known to have the function of and the secretion and the reabsorption of the bile juice, especially water and inorganic electrolytes. This experiments was performed to study the ultra sturctural changes of the bile ductule of the rabbit liver after common bile duct ligation. Common bilt duct ligation was performed under ether anesthesia. The rabbits were sacrificed on the 1st, 2nd, 3rd, 5th, 7th and 14th day after the operation. Small blocs of livers were fixed 2.5% glutaraldehyde-1.5% paraformaldehyde solution, followed by 1% osmium tetroxide, embedded in araldite mixture, cut with LKB-V ultratome, stained with uranyl acetate- lead citrate, and observed with JEM 100CX II electron microscope. The results were as follows: 1. The cytoplasm of normal bile ductular epithelial cell shows lighter density as compared with that of the of the hepatocyte. Occasional dark cells can be seen between the light ductular cells. 2. On the apical free surface of the normal ductular cells, numerous microvilli project into the lumen, and occasional cilia have been observed. The apical pole of lateral surface exhibits junctional complex, including tight junction, intermediate junction and desmosmes, whereas basal pole have a complex interdigitations. Ductular cell rests on a basal lamina. 3. After the common bile duct ligation, bile ductule showed enlargement of lumen, swelling and reduction of microvilli and proliferation of microfilaments. 4. After the common bile duct ligation, bile ductule showed well developed junctional complex and focally duplicated and thickened basal lamina. From the above results, it was concluded that in the acute cholestasis induced by common bile duct ligation, bile ductular cell shows morphological changes, probably to keep the ductular wall from the increasing intraductular pressure.

방사선 조사를 받은 흰쥐 신경뇌하수체 관문의 미세구조 : 관문의 새로운 개념설정 Establishment of a New Concept on the Barrier

이헌용,안의태,양남길,고정식,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

신경뇌하수체는 뇌의 일부지만 뇌실둘레기관(circumventricular organ)으로서 전형적인 혈액-뇌관문이 없으므로 혈관 안팎의 물질이동이 자유로운 신경내분비기관이다. 이 실험에서는 심한 방사선 조사시에 혈액-신경뇌하수체관문의 형태적 대응을-연구함으로써, 관문의 특성을 분석했으며, 관문의 구성을 구체적으로 설정하여 이를 개념화 할 것을 제안하였다. 체중 200-250g의 숫흰쥐를 sodium thiopenthal 로 마취시킨 후 Mitsubishi선형가속기로 방사선 조사를 시켰다. 조사조건은 거리 80cm, 조사구역 30 X 30cm, 조사깊이 1.2cm, 조사속도 분당 200 rads로 하여 실험군에 따라 3,000 rads 또는 6,000 rads가 되도록 했다. 조사후 6시간, 2일, 6일후에 각군의 동물을 도살 하여 신경뇌하수체를 떼어냈다. 떼어낸 조직은 1% glutaradehyde- 1% paraformaldehyde액에 1차 고정하고, 1% osmium tetroxide액에 2차 고정하였고, araldine혼합액에 포매된 조직은 절편을 만들어 uranyl acetate와 lead citrate액으로 염색해서 전자현미경으로 관찰하였다. 주로 모세혈관주위공간에서 관문구조를 중심으로 관찰한 결과 3,000 rads 조사군과 6,000 rads조사군 모두가 비슷하게 심한 변화를 보였고, 변화의 정도가 2일군에서 가장 심했으며 6일군에서는 약간 안정되는 모습이었으나 변화의 양상은 모든 실험군을 통해서 비슷하였다. 가장 두드러진 변화는 모세혈관주위공간에서 나타났는데 공간의 확장, 큰포식세포의 증가와 활성화, 신경뇌하수체세포속에 들어 있던 신경종말들의 이탈, 먼지 같은 물질의 증가 등을 들 수 있었다. 특히 큰 포식세포의 변화는 매우 특징적이어서 넓은 세포질관(판상족, lamellipoda)을 형성하여 모세혈관과 신경뇌하수체세포사이를 차단시킬 뿐아니라 왕성한 포식작용으로 공간내의 축삭종말들을 용해시켰다. 큰포식세포의 세포질안에는 과립형질내세망들이 매우 발달하였고, 세포질 영역이 매우 넓어진 것으로 볼 때, 이들이 기동타격대로서 활발히 움직이는 매우 효율적인 관문의 구성성분으로 생각되었다. 특히 신경뇌하수체는 전형적인 혈액-뇌관문이 없으므로 신경내분비기능의 수행에는 유리하나 면역활성물질이나 독성물질등 뇌에 해로운 물질의 왕래를 차단하여 제거하거나, 과다하게 분비된 신경호르몬을 조절하는 일이 중요하다고 볼 때, 큰포식세포가 이같은 역할에 적합한 구성성분이라는 결론을 얻었다. 이 실험에서는 효율성이 높은 관문으로서 혈액-신경뇌하수체관문이 구성성분을 차례로 기재하고 이를 개념화 할 것을 제안한다. 모세혈관과 축삭종말사이에 형성되어 있는 혈액-신경뇌하수체관문이 구성을 차례로 표기하면 다음과 같다 (그림 9,10). 1. 유창모세혈관 내피 2. 모세혈관 내피의 기저판 3. 혈관주위세포와 기저판("이차방어선", 한정된 범위내에서 움직일 수 있다). 4. 큰포식세포, 필요에 따라 판상족(lamellipoda)을 넓게 뻗는다.("삼차방어선", 모세혈관 주위공간 속을 이동해 다니는 "기동타격대") 5. 신경뇌하수체세포의 기저판 6. 신경뇌하수체세포의 세포질돌기(호르몬분비 조절) To study the morphological characteristics of the blood-neurohypophysis barrier system in a severely altered situation, the heads of rats were exposed to heavy X-irradiation. Rats weighing 200-250 g each were anesthetized with sodium thiopenthal, and placed on the table of Mitsubishi linear accelerator ML-4MV. Only heads of rats were placed within the exposure area of 30 cm X 30 cm. Irradiation was processed at the distance of 80 cm, with the speed of 200 rads/min in the radiation depth of 1.2cm. Total doses were 3,000 rads or 6,000 rads according to the animals of the different experimental groups. Rats were sacrificed on 6 hours, 2 days or 6 days following radiations. Tissue blocks of neurohypophyses were fixed in the 1% glutaraldehyde-1% paraformaldehyde solution, and they were refixed in the 1% osmium tetroxide solution. Ultrathin sections were contrasted with uranyl acetate and lead citrate solutions. Electron micrographs exhibited dramatic changes within the perivascular space of neurohypopysis. The perivascular space was greatly enlarged, and it contained many macrophages, floating axonal endings and plentiful flocculent materials. The enlargement was largest in the 2 day-group animals. Many macrophages are activated, and it showed tremendous cytoplasmic lamellipoda. Wide plate of macrophagic cytoplasm usually engulfed the floating axon terminals, and are located between the cappillary and the pituicytes. The situation gave the impression that macrophages prevent, filter and/or retrieve the excessive materials transported between the capillary and the axonal endings. Since the perivascular microenvironment of neurohypophysis is more vulnerable as compared with those brain areas equipped with blood-brain barrier, the functional barrier system by macrophages in the neurohypophysis should have important role. The concept of blood-neurohypophyseal barrier with the following components is proposed. The components of the barrier system from the blood pool to the hormonal pool are 1. Endothelium of fenestrated capillary 2. BAsal lamina of endothelium 3. Pericyte("second line of defense". mobile in a limited area) 4. Macrophage, extending its wide cytoplasmic plate(the lamelipoda) in need("third line of defense". freely movable in the perivascular space, "active surveillance system") 5. Basal lamina of pituicyte 6. Cytoplasmic processes of pituicyte