인태아 상경신경절 발육에 관한 전자현미경적 연구

김대영,김백윤,윤재룡,Kim, Dae-Young,Kim, Baik-Yoon,Yoon, Jae-Rhyong 한국현미경학회 1998 Applied microscopy Vol.28 No.2

The development of the superior cervical ganglion was studied by electron microscopic method in human fetuses ranging from 40 mm to 260 mm of crown-rump length (10 to 30 weeks of gestational age). At 40 mm fetus, the superior cervical ganglion was composed of clusters of undifferentiated cell, primitive neuroblast, primitive supporting cell, and unmyelinated fibers. At 70mm fetus, the neuroblasts and their processes were ensheated by the bodies or processes of satellite cells. The cytoplasm of the neuroblast contained rough endoplasmic reticulum, mitochondria, Golgi complex, Nissl bodies and dense-cored vesicles. As the neuroblasts grew and differentiated dense-cored vesicles moved away from perikaryal cytoplasm into developing processes. Synaptic contacts between the cholinergic axon and dendrites of postganglionic neuron and a few axosomatic synapses were first observed at 70 mm fetus. At 90 mm fetus the superior cervical ganglion consisted of neuroblasts, satellite cells, granule-containing cells, and unmyelinated nerve fibers. The ganglion cells increased somewhat in numbers and size by 150 mm fetus. Further differentiation resulted in the formation of young ganglion cells, whose cytoplasm was densely filled with cell organelles. During next prenatal stage up to 260 mm fetus, the cytoplasm of the ganglion cells contained except for large pigment granules, all intracytoplasmic structures which were also found in mature superior cervical ganglion. A great number of synaptic contact zones between the cholinergic preganglionic axon and the dendrites of the postganglionic neuron were observed and a few axosomatic synapses were also observed. Two morphological types of the granule-containing cells in the superior cervical ganglion were first identified at 90 mm fetus. Type I granule-containing cell occurred in solitary, whereas type II tended to appeared in clusters near the blood capillaries. Synaptic contacts were first found on the solitary granule-containing cell at 150 mm fetus. Synaptic contacts between the soma of type I granule-containing cells and preganglionic axon termials were observed. In addition, synaptic junctions between the processes of the granule- containing cells and dendrites of postganglionic neuron were also observed from 150 mm fetus onward. In conclusion, superior cervical ganglion cells and granule-containing cells arise from a common undifferentiated cell precursor of neural crest . The granule-containg cells exhibit a local modulatory feedback system in the superior cervical ganglion and nay serve as interneurons between the preganglionic and postganglionic cells.

비부식성 플럭스를 이용한 알루미늄 브레이징용 필러 소재의 저온 성형용 금속 복합 분말 개발

김대영,장하늘,윤대호,신윤호,김성호,최현주,Kim, Dae-Young,Jang, Ha-Neul,Yoon, Dae-Ho,Shin, Yun-Ho,Kim, Seong-Ho,Choi, Hyun-Joo 한국분말재료학회 (*구 분말야금학회) 2019 한국분말재료학회지 (KPMI) Vol.26 No.1

In aluminum brazing processes, corrosive flux, which is used in preventing oxidation, is currently raising environmental concerns because it generates many pollutants such as dioxin. The brazing process involving non-corrosive flux is known to encounter difficulties because the melting temperature of the flux is similar to that of the base material. In this study, a new brazing filler material is developed based on aluminum and non-corrosive flux composite powder. To minimize the interference of consolidation aluminum alloy powder by the flux, the flux is intentionally embedded in the aluminum alloy powder using a mechanical milling process. This study demonstrates that the morphology of the composite powder can be varied according to the mixing process, and this significantly affects the relative density and mechanical properties of the final filler samples.

바람과 대공간 구조물

김대영,김지영,김상대,Kim, Dae-Young,Kim, Ji-Young,Kim, Sang-Dae 한국공간구조학회 2005 한국공간구조학회지 Vol.5 No.1

골수섬유증과 관련된 양측 수부의 괴저성 농피증

김대영,원영호,김성진,이승철,전인기 ( Dae Young Kim,Young Ho Won,Seong Jin Kim,Seung Chul Lee,Inn Ki Chun ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.4

Pyoderma gangrenosum is a rare neutrophilic dermatosis manifesting as painful pustules or bullae, which rapidly become necrotic to produce an ulceration. It is often associated with systemic disease, such as inflammatory bowel disease, rheumatoid arthritis, leukemia, but myelofibrosis is reported rarely for its underlying disease. The most common location is the lower extremities, and the pyoderma gangrenosum also occur infrequently on the hand and face. As in our case, bilateral involvement of the hands are rarely reported. We present a case of pyoderma gangrenosum that had developed on both hands in a 66 year old man who had macrocytic,anemia. A bone marrow biopsy revealed proliferation of fibroblasts and a dense reticulin network consistent with myelofibrosis, the association of which is very rare world wide. (Kor J Dermatol 1997;35(4): 809-813)

프리팹 교량 거더 (노듈러 거더)의 적시 시공을 위한 공기-비용 알고리즘 개발

김대영,정태원,김량균,Kim, Dae-Young,Chung, Taewon,Kim, Rang-Gyun 한국건설관리학회 2023 한국건설관리학회 논문집 Vol.24 No.3

In the case of the construction industry, the relationship between process and cost should be appropriately distributed so that the finished product can be delivered at the minimum fee within the construction period. At that time, it should be considered the size of the bridge, the construction method, the environment and production capacity of the factory, and the transport distance. However, due to various reasons that occur during the construction period, problems such as construction delay, construction cost increase, and quality and reliability degradation occur. Therefore, a systematic and scientific construction technique and process management technology are needed to break away from the conventional method. The prefab(Pre-Fabrication) is a representative OSC (Off-Site Construction) method manufactured in a factory and constructed onsite. This study develops a resource and process plan optimization system for the process management of the Nodular girder, a prefab bridge girder. A simulation algorithm develops to automatically test various variables in the personnel equipment mobilization plan to derive the optimal value. And, the algorithm was applied to the Paju-Pocheon Expressway Construction (Section 3) Dohwa 4 Bridge under construction, and the results compare. Based on construction work standard product calculation, actual input manpower, equipment type, and quantity were applied to the Activity Card, and the amount of work by quantity counting, resource planning, and resource requirements was reflected. In the future, we plan to improve the accuracy of the program by applying forecasting techniques including various field data.

건설정보화의 효율적 활용을 위한 국내 건설업체의 경험지식시스템(LLS) 실태 분석 및 의식조사 연구

김대영,Kim, Dae-Young 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.1

Better utilization of the knowledge of employees in any organization has long been accepted as a vital component of a corporation's competitiveness. This has been considered even more important in the construction industry due to the dynamic and intermittent nature of construction projects. With the rapid advance of network technologies during the last decade, construction companies quickly shifted their focus of knowledge management to interactive online repositories. However, the efforts of leveraging organizational knowledge has remained fragmented in the construction industry until recent years. In addition, companies have begun to realize that actual returns on this investment in network technologies would be far less than initial expectations if online efforts do not incorporate companies' general offline knowledge management efforts, which are done without the use of computer network. Thus, this paper focused on assessment of implementing current Lessons-Learned Systems at the large construction companies in Korea to provide the foundation for developing a renovated conceptual Lessons-Learned System model. 어떠한 조직 내의 피고용인의 지식을 도출해내고 이를 체계적으로 데이터화시키고 상용화시킨다는 것은 그 기업의 경쟁력을 향상시키는데 있어서 절대적인 요인으로 받아들여지고 있다. 특히, 건설업에 있어서 건설 프로젝트의 대규모적이고 간헐적인 건설 산업 특성상 이러한 활동은 더욱 중요한 요인으로 받아들여지고 있다. 지난 십년동안 눈부신 네트워크 기술의 발달로 건설 회사는 온라인 저장소를 활성하기 위해 지식 경영(Knowledge Management)으로 그 초점을 맞추고 있다. 하지만 회사들은 만약 온라인상의 노력이 회사의 일반적으로 컴퓨터의 사용 없이 습득된 오프라인 지식과 교감되지 않으면 실제적인 투자에 대한 회수가 초기에 기대했던 것 보다 훨씬 더 적다는 것을 깨닫기 시작했다. 따라서 이번 연구의 가장 큰 목적은 한국의 건설 산업에 기반을 두고 있는 대기업을 위한 경험지식 시스템(Lessons-Learned System)의 개념적인 모델의 발전을 위한 토대를 마련하기 위하여 이를 성공적으로 발전시키고 운영하기 위해 먼저 국내건설 대기업의 경험지식 시스템 사용실태 및 현황을 파악하는데 있다.

HD-270 MLC의 소개 및 유용성평가

김대영,김원택,이화중,이강혁,Kim Dae Young,Kim Won Taek,Lee Hwa Jung,Lee Kang Hyeok 대한방사선치료학회 2003 大韓放射線治療技術學會誌 Vol.15 No.1

I. 목적 MLC의 단점인 조사영역경계의 요동현상이나, 반음영의 크기를 감소시킬 수 있는 HD270 MLC에 관한 소개와 유용성에 대해 평가하였다. II 대상 및 방법 HD-270 MLC는 PRIMUS(Siemens)의 치료테이블(ZXT) 과 다엽콜리메이터(3D MLC)를 leafs면에 수직방향으로 이동시킴으로써 유효반음영과 조사영역 경계의 요동을 감소시킨다. HD-270 MLC의 효율성과 적당한 resolution을 결정하기 위해 field edge angle(Y축과 이루는 각)이 0도에서 75도까지 15도의 간격으로 된 다각형의 field를 만들고 resolution은 5mm, 3mm, 2mm로 각각의 HD-270 group을 만들어 Siemens사 선형가속기(PRIMUS)의 6MV 광자선을 사용하여 solid phantom에서 SAD 100cm, depth 1.5cm으로 X-Omat film(Kodak)에 60MU로 조사하였다. 조사된 film은 Lumiscan75(LUMISYS)로 스캔해서 RIT113(Radiological Imaging Technology Inc. USA)으로 분석하여 유효반음영과 조사영역 경계의 요동의 변화를 측정하였다. 그리고 치료테이블 움직임의 정확성을 테스트하기 위해 테이블 위에 50Kg의 인체모형팬텀을 놓고 0.001inch의 정밀도를 가진 dial gauge로 가로, 세로, 수직의 세 직각방향으로 ${\pm}5mm,\;{\pm}4mm,\;{\pm}3mm,\;{\pm}2mm$단계별로 측정하였다 III. 결과 Resolution과 field edge angle이 증가할수록 유효반음영과 조사영역 경계의 요동현상은 증가하였다. 그리고 지멘스 ZXT 치료테이블움직임의 오차범위는 ${\pm}1mm$ 이내로 양호하였다. IV. 결론 최근 많이 사용되어지고 있는 다엽콜리메이터의 문제점들을 보완 할 수 있는 HD-270 MLC를 사용함으로써 MLC의 임상적용범위를 보다 넓힐 수 있을 것이다. I. Purpose The multileaf collimator(MLC) has many advantages, but use of the MLC increased effective penumbra and isodose undulation in dose distribution compared with that of an alloy block. In this work, we introduced the HD-270 MLC, which can improve the above disadvantages of MLC, and reported its feasibility study. II. Method and Materials The HD-270 MLC is a technique which combines the use of the existing Siemens multileaf collimator(3D MLC) with patient translation perpendicular to the leaf plane. The technique produces a smoothed isodose distribution with the reduced isodose undulation and effective penumbra. To assess the efficacy of the HD-270 technique and determine the appropriate resolution, a polygonal shaped MLC field was made to produce field edge angles from 0 degree to 75 degree with a step of 15 degree. Each HD-270 group was generated according to the allowed resolution, i. e., 5, 3, and 2mm. The experiment was carried out on Primus, a Siemens linear accelerator configured with HD-270 MLC. The total 60 MU of 6 MV photon beam was delivered to X-Omat film(Kodak, USA) at a SAD of 100 cm and 1.5 cm depth in solid water phantom. Exposed films were scanned by Lumiscan75(LUMISYS) and analyzed using RIT113 software(Radiological Imaging Technology Inc., USA). To test the mechanical accuracy of table movement, the transverse, longitudinal, and vertical positions were controlled by a consol with ${\pm}5\;mm,\;{\pm}4\;mm,\;{\pm}3\;mm,\;and\;{\pm}2\;mm$ steps, and then measured using a dial gauge with an accuracy of 0.001 inch. During the experiments, the table loaded with about 50Kg human phantom to simulate the real treatment situation. III. Results The effective penumbra and isodose undulation became larger with increase the resolution and field edge angle. The accuracy of the table movement on each direction is good within the ${\pm}1\;mm$. IV. Conclusion Clinical use of the MLC can be increased by using of the HD-270 MLC which complements to the disadvantages of the MLC.

LCC Analysis to Determine an Appropriate Apartment Rent Rate for HVAC System Renovation Projects

김대영,임형철,Kim, Dae Young,Lim, Hyoung-Chul Korea Society of Industrial Information Systems 2015 한국산업정보학회논문지 Vol.20 No.5

Residential building owners are turning toward renovating their existing buildings to improve old and inefficient HVAC systems. Due to the renovation, much of the added costs will inevitably be passed on to tenants by increasing rent rates. This increment often increases the vacancy rate in the buildings. To balance the interests of both owners and tenants, this paper suggested a method to determine an appropriate rental rate increment for the HVAC system renovation. A case study on residential buildings was conducted to determine a balanced point where the rental rate increment that offsets the amount tenants are willing to pay for the renovation. To calculate all costs incurred by the renovation, life-cycle cost analysis was carried out. Therefore, this paper ultimately provides a threshold value of rental rate increment such that building owners can make a reasonable decision on the HVAC system renovation.

A Theoretical Study on Minimum-Bandwidth Line Coding

김대영,강창구,배철,오승협,Kim, Dae-Young,Kang, Chang-Goo,Bae, Cheol,Oh, Seung-Hyeub The Institute of Electronics and Information Engin 1990 전자공학회논문지 Vol.27 No.5

In this paper, some new results on minimum-bandwidth system are presented. First, we state sufficient condition for the existance of a existance of a power spectral null at the zero frequency and Nyquist frequency. Second, eye boundary functions and eyewidth are obtained for minimum-bandwidth systems of arbitrary numbers of transmitted symbol levels. Third, for linear minimum-bandwidth systems usually known as PR systems, we derived formulars for evaluating DSVs and ASVs in terms of the coefficients of the system polynomials and using formulars, we obtain DSVs and ASVs of various PR systems. Last, the relations among DSV, ASV, power spectral nulls, system polynomial nulls, and the minimum-bandwidth property are summarized.

한국산(韓國産) 활엽수재(闊葉樹材) 천공판(穿孔板)의 미세형태(微細形態)에 관(關)한 연구(硏究) (II) - 천공판(穿孔板)의 구조(構造) -

김대영,이원용,Kim, Dae-Young,Lee, Won-Yong 강원대학교 산림과학연구소 1997 Journal of Forest Science Vol.13 No.-

우리나라산(産) 활엽수재 25과(科)45속(屬)78종(種)의 수종에 대하여 천공을 이루고 있는 구조를 주사전자현미경(SEM)을 사용하여 3차원적(次元的) 형태를 관찰하고, 이들의 미세한 천공구조의 본질을 조사하여 과(科), 속(屬), 종별(種別)로 고유의 특징을 구명하기 위하여 본 연구를 실시 하였으며 천공의 분류는 단천공(單穿孔), 계단천공(階段穿孔) 및 다공천공(多孔穿孔)(계단천공(階段穿孔) 이외의 다공천공(多孔穿孔))의 3가지로 구분하고 이것을 기초로하여 (1) 단천공(單穿孔)만을 갖는 수종(60종), (2) 계단천공(階段穿孔)만을 갖는 수종(5종), (3) 단천공(單穿孔)과 계단천공(階段穿孔)을 갖는 수종(4종), (4) 단천공(單穿孔)과 다공천공(多孔穿孔)을 갖는 수종(2종), (5) 계단천공(階段穿孔)과 다공천공(多孔穿孔)을 갖는 수종(5종), (6) 단천공(單穿孔), 계단천공(階段穿孔) 및 다공천공(多孔穿孔)을 갖는 수종(2종)의 6개의 그룹으로 분류 하였다. 그 결과 Betulaceae에 속하는 수종은 대부분이 계단천공(階段穿孔)을 나타내고 있으나 개서어나무에서는 단천공(單穿孔)이 출현하는 특징이 있으며, Fagaceae의 갈참나무에서는 단천공(單穿孔)의 천공연(穿孔緣)의 주연에 돌기물이 발생된 vesture천공이 관찰 되었다. 또한 계단천공(階段穿孔)의 상하의 bar가 서로 일치되고 있지않은 mismatching perforation plate가 물갬나무와 물오리나무에서 관찰되었으며 또한 계단천공의 bar사이에 벽물질이 남아 일부 또는 전부가 막혀 있거나 microfibrillar 모양의 substructure가 물박달나무와 계수나무에서 발견되었다. Perforation plate was observed in 78 species(45 genera, 25 families) of Korean native hardwoods using SEM and it was divided into three types, i.e., simple, scalariform and multiple perforation plates, Based on occurance of these types, the species examined were classfied into the following six groups : (1) 60species(35 genera, 21 families) having exclusively simple perforation, (2) 5 species(2 genera, 1 families) having exclusively scalariform perforation plates, (3) 4 species(4 genera, 3 families) having simple and scalariform perforation plates, (4) 2 species(2 genera, 1 families) having simple and multiple perforation plates, (5) 5 species(3 genera, 3 families) having scalariform and multiple perforation plates and (6) 2 species(2 genera, 2 families) having simple, scalariform and multiple perforation plates. Mismatching perforation plates were found in two species of Betulaceae, Alnus hirsuta var. sibirica and Alnus hirsuta and peculiar substructure between the bars of the scalariform perforation plate was observed in Betulaceae, Betula davurica and Cercidiphyllaceae, Cerdiphyllum japonicum and the vestured perforation plate was found in Quercus aliena.