• Applied Microscopy
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• 제26권3호
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• pp.349-367
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• 1996

The development of small granule-containing cell in the superior cervical ganglion was studied by electron microscopic method in human fetuses ranging from 40 mm to 260 mm crown rump length (10 to 30 weeks of gestational age). At 40 mm fetus, the superior cervical ganglion was composed of clusters of undifferentiated cells, primitive neuroblasts, and unmyelinated nerve fibers together with blood vessels. At 90 mm fetus, the superior cervical ganglion consisted of neuroblasts, satellite cell, small granule-containing cells, and unmyelinated nerve fibers. Two morphological types of the small granule-containing cells in the superior cervical ganglion were first indentified at 90 mm fetus, but were rare. Type I granule-containing cell occurred in solitary and had long processes, whereas type II cells tend to appeared in clusters near the blood capillaries. The granule-containing cells were characterized by the presence of dense-cored vesicles ranging from $150{\sim}300nm$ in diameter in both the cell bodies and processes. Other organelles included abundant mitochondria, rough endoplasmic reticulum, neurotubules, and widely distributed ribosomes. The granule-containing cells had long processes similar to those found in principal ganglionic cells. They could be identified by their content in dense-cored vesicles. The small granule-containing cells increased somewhat in size and number with increase of fetal age. Synaptic contacts were first found on the solitary granule-containing cell at 150 mm fetus. Synaptic contacts between the soma and processes of type I granule-containing cells and preganglionic axon terminals were observed. In addition, synaptic junctions between the processes of granule-containing cells and presumed dendrite of postganglionic neuron were also observed from 150 mm onward. On the basis of these features type I granule-containing cells could be considered as interneurons. The clusters of type II granule-containing cells were located in the interstitial or subcapsular portions of the ganglion, and had short processes which ended in close relation to fenestrated capillaries. Therefore it may be infer that clusters of type II granule-containing cells have an endocrine function.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제7권1호
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• pp.78-82
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• 2004

보존적인 스테로이드 치료로 호전이 없는 심한 복부증상을 동반한 HSP 환자의 치료에는 아직까지 정설이 없으나, 저자들은 면역글로불린 정맥투여로 증상이 호전된 증례와 소장의 경장괴사를 동반하고 수술적 치료로 호전된 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다.

• 대한의용생체공학회:의공학회지
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• 제25권2호
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• pp.97-102
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• 2004

소 동물 촬영에 이용될 수 있는 고해상도의 x-선 cone-beam micro computed tomography (micro-CT) 시스템을 개발하였다 Micro-CT 시스템은 120${\times}$120 mm2 의 2차원 평판 x-선 감지기, micro-focus x-선 발생장치, 주사 기구부, 병렬처리 영상 재구성 시스템으로 이루어져 있다. 개발된 시스템의 성능을 평가하기 위해 대조도와 공간해상도를 측정하였다. 대조도 실험에서는 95 mGy 에서 36 CT-번호를 구별할 수 있음을 확인하였고, 공간 해상도 실험에서는 14 lp/mm 의 성능을 확인하였다. 소 동물 촬영 결과로 실험용 쥐의 대퇴부, 심장 그리고 복부 동맥 혈관을 촬영한 경상을 제시하였다. 개발된 micro-CT 시스템은 소 동물을 이용한 생명공학 분야 연구에 널리 이용될 수 있을 것으로 기대된다.

• 수산해양기술연구
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• 제43권1호
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• pp.62-70
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• 2007

Marine casualties of vessel are serious problems on social and national aspects, because it results in sacrifice of lives, a great lose of properties and marine pollution. According to recent statistics of marine casualties of vessel, fishing boats are more likely to be ended in the casualty, and especially, small fishing boats cause much more accidents than any other big vessels. Most of marine casualties were caused by the human factors such as poor watch keeping, inadequate manoeuvering and negligent action for engine, etc. This study is intended to provide navigator of small fishing boat with a specific information of necessary to assist both the manoeuvering and the avoidance of capsizing. The manoeuvering characteristics of ship can be adequately judged by the results of typical ship trials manoeuvres. For this purpose, the author measured the roll responses of a small fishing boat in waves using the real sea experimental measuring system, and analyzed the experimental data by the statistical and spectral analyzing methods to get the characteristics of the roll motion responses of the small boat through the wave directions and the ship's speed.

• 한국추진공학회지
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• 제26권3호
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• pp.54-65
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• 2022

2단형 소형위성발사체 상단 메탄엔진에 다중점화가 가능한 간결한 점화기를 개발하고 있다. 첫 번째로 적층제조 기술을 활용하여 믹싱헤드와 일체형으로 다중점화장치를 설계 및 제작하였다. 두 번째로 연소기 헤드에 공급되는 점화 추진제를 주-추진제 배관에서 분기하여 공급함으로써 점화가스 저장을 위한 별도의 고압 용기가 필요없다. 1톤급 액체산소/액체메탄 엔진 연소기 헤드에 일체형으로 고안된 신규 점화기에 대해서 점화기 단독시험, 연소기 점화시험 및 연소기 성능시험 등의 다양한 시험을 수행하였고, 안정적인 점화 성능을 확인하였다.

• 대한수의학회지
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• 제41권3호
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• pp.281-285
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• 2001

This study was performed to investigate the gross anatomical features and microscopical structures of the hemal nodes and the hemolymph nodes in the sheep. The hemal nodes and hemolymph nodes were observed mainly in periphery of the thoracic and abdominal aortae of the animals. The size of hemal nodes was generally smaller than that of the hemolymph nodes, and the shape of the both organs was spherical or ovoid. The color of the hemal nodes was red, while that of the hemolymph nodes was grary with red bands. The hemal nodes were surrounded by a relatively thick connective tissue capsule and there were extensive subcapsular sinuses distended by a great number of erythrocytes. Although a few number of lymphatic nodules and small areas of diffuse lymphatic tissues were observed in the parenchyma, no typical cortex and medulla were defined in the hemal node. Small numbers of blood vessels were found at the connective tissue capsule but lymph vessel was not observed microscopically in this organ. The hemolymph nodes were covered by a relatively thick connective tissue capsule and there was a hilus in each node. The parenchyma was divided into cortex and medulla. The cortex was composed of a few numbers of lymphatic nodules and some diffuse lymphatic tissues. The medulla comprised medullary sinuses and cords. Afferent and efferent lymph vessels were observed at the periphery of the capsule adn the hilus, respectively. The subcapsular and medullary sinuses were not extensive but filled with small numbers of erythrocytes. The stroma of hemal node and hemolymph node was composed of reticular cells and fibers, and the capsule and trabecula consisted of collagenous fibers with smooth muscle fibers.

• 한국항해학회지
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• 제24권1호
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• pp.1-12
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• 2000

The ships over the certain navigation area or her length are required to carry charts under the relevant laws. Charts are indispensible to the ships and fishing vessel, because their crew should know the water depth and location of obstacle in order to avoid danger in the navigation and fishing area. But it was found that many ships do not carry proper charts onboard according to the research marine accidents files of marine accident inquiry agency, and questionnaire survey. Consequently, many ships run aground on the coast and port. This study examined the present status of the coastal ship and the fishing vessels, and explained some problems in the aspect of the covering area, the place, the number of the selling agent and adjoining chart, as well as the geographical and traffic density, the crew on board the ship's characteristics, and so on. In this study we propose the way to solve the problem. firstly, the category of the fishing vessel which should carry the chart on bard under the related laws are required to be lowered to 10 gross tons. Besides a ship inspector should examine if the charts covering the area where to navigate even when the temporary inspection is done are carried on board property. Secondly, the inspection body or the controlling office of ship's entry and departure should check throughly whether the ships concerned carry the chart on board. Thirdly the fishing vessels should used the fishing charts, and the body concerned should train the offices about how to use chart, especiany the difference between Tokyo datum and WGS-84 datum. Fourthly the customized chart such as an atlas like a map, a calenda-type chart, a small chart, as a coated chart needs to be publish for the safety of small ship and fishing vessel. Fifthly, it is advisable to draw a recommended course in the route where the coastal navigate mainly and in the narrow channel, The adjoining area should be improved, as well as the qualify of the chart paper. Sixthly, publication of additional new chart in the southern part of East Sea, the eastern part of South Sea, the western part of South Sea and middle part of Yellow Sea near Incheon port should be thought over. Seventhly, the number of chart selling agent should be increased for the sake of purchaser in proportion to the number of port, and small correction of charts in selling agent must be carried out completely.

• 대한수의학회지
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• 제37권4호
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• pp.727-734
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• 1997

Hemolymph nodes of the Korean native cattle were observed gross anatomically and light microscopically in this study. Hemolymph nodes of the Korean native cattle were found mainly at the periphery of the thoracic and abdominal aortae although there were some other parts to observe these small organs. These organs were small in size and spherical or ovoid in shape, and color of them was dark red or gray in common with red band. The hemolymph nodes were surrounded by a relatively thick connective tissue capsules composed of dense collagen fibers with many scattered smooth muscle fibers and there was a hilus in each node. The parenchyma was divided into an outer cortex and an inner medulla. A few primary and secondary lymph nodules were observed in the cortex and there were diffuse lymphatic tissues among them. The medullary cords consisted of diffuse lymphatic tissues were separated by the medullary sinuses which filled with erythrocytes. The afferent and efferent lymph vessels were observed at the periphery of the capsule and the hilus area, respectively. The stroma of the hemolymph nodes was composed of reticular cells and fibers, and the meshwork of the stroma was filled with many lymphocytes and erythrocytes, and a few macrophages and megakaryocytes etc. These findings suggest that the hemolymph node of the Korean native cattle is involved in blood filtration and immune reaction.

• Journal of Advanced Marine Engineering and Technology
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• 제39권3호
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• pp.261-267
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• 2015

해양레저선박의 안전사고를 미연에 방지하기 위하여 해상의 위험상황 경고 및 선박의 상태를 점검할 수 있는 지원시스템이 요구된다. 따라서 본 논문에서는 해양레저선박의 항해 안전을 확보하기 위하여 선박의 상태를 모니터링 및 관리할 수 있는 항해 안전 지원시스템을 제안한다. 시스템 개발 과정에서 요구되는 기능, 구성 및 운용 알고리즘을 도출하고 해양레저선박 모니터링 시스템, N2K/WIFI Gateway, 추천항로 시스템, 해양레저 금지구역 경보 시스템을 구현하여 목적에 맞도록 올바르게 동작하는지를 각 시스템을 통합하여 검증하였다.

• Clinical and Experimental Pediatrics
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• 제45권8호
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• pp.1024-1027
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• 2002

저자들은 급성 복통을 주소로 개인의원을 방문하여 급성 충수염이 의심되어 본원 응급실로 전원 된 5세 남아에서 초음파와 CT로 복막수염으로 진단하고 수술이나 항생제 치료 없이 자연 치유된 복막수염 1례를 보고하는 바이다.