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.

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)

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

Mo(100) 표면에 $TiO_2$초박막의 성장과 특성

김대영,Kim, Dae Young 대한화학회 1997 대한화학회지 Vol.41 No.5

Ultra-thin $TiO_2$ films are grown on the Mo(100) surface using evaporated Ti metal under ambient $O_2$ pressure. The thickness of the $TiO_2$ film is controlled by the dosing rate of Ti metal over Mo(100) which is determined from the Auger signal changes with dosing time. 30 ML, 5 ML, and 1.6 ML thick films are prepared and used to determine the growth mechanism, the chemical composition, and the surface structure of the films. The growth mechanism of the $TiO_2$ film on Mo(100) is observed to follow the layer-by-layer growth mechanism. The chemical composition of the film is found to be that of bulk $TiO_2$. The surface plane of the film is (001), which facets irreversibly at 1200 K. The LEED pattern obtained from the film can be explained with the faceted surface with {011} planes reconstructed to $(2\sqrt2{\times}\sqrt2)R45^{\circ}$ with respect to the $TiO_2$ (001) surface. The film is somewhat thermally unstable when annealed to 1300 K. The film sputtered with $Ar^+$ ion is also studied by XPS. 초고진공조에서 산소 분압, $1{\times}10^{-6}$ Torr, 하에서 Ti 금속을 Mo(100)에 증발시킴으로써 $TiO_2$ 초박막을 성장시켰다. Ti 금속을 Mo(100) 표면에 증착시킨 시간에 따른 오재(Auger) 봉우리의 크기 변화율을 조사함으로써 Ti 금속의 증발 속도를 알아내고, 그것을 이용하여 $TiO_2$ 박막 성장시 박막의 두께를 조절하였다. 30 ML, 5 ML, 1.6 ML 두께의 $TiO_2$ 박막을 만들어 박막의 성장메카니즘, 박막의 화학적 조성, 박막의 표면 구조를 연구하였다. 박막의 성장 메커니즘은 층별 성장에 가까운 성장 방식인 것으로 설명할 수 있다. 박막의 화학적 조성은 본체 $TiO_2$ 와 동일하였다. 박막의 표면은 (001) 평면이며, 고온 1200 K에서 비가역적으로 부면화(faceging)한다. 박막으로부터 관찰된 저에너지 전자회절 무늬는 $TiO_2$ (001) 표면이 {011} 평면을 가진 부면을 형성하고 각 부면이 다시 $TiO_2$ (001) 평면에 대하여 $(2\sqrt2{\times}\sqrt2)R45^{\circ}$로 재건축한다는 것으로 설명될 수 있다. 박막은 1300 K의 고온에서 얼마간 열적 불안정성을 보인다. $Ar^+$ 이온으로 스퍼터링한 $TiO_2$ 박막에 대하여 XPS를 이용하여 역시 알아보았다.

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.

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 건설관리 : 한국건설관리학회 학회지 Vol.24 No.3

건설업의 경우 공사기간 내에 최소한의 수수료로 완제품을 인도할 수 있도록 공정과 원가의 관계를 적절히 분배해야 한다. 이때 교량의 크기, 공법, 공장의 환경과 생산능력, 운송거리 등을 고려해야 한다. 그러나 공사기간 중 발생하는 다양한 원인으로 인해 공사지연, 공사비 상승, 품질 및 신뢰성 저하 등의 문제가 발생하고 있다. 따라서, 기존의 방식에서 탈피하기 위해서는 체계적이고 과학적인 시공기술과 공정관리 기술이 필요하다. 프리팹(Pre - Fabrication)은 공장에서 제작하여 현장에서 시공하는 대표적 OSC(Off-Site Construcation) 공법이다. 본 연구에서는 프리팹 교량 거더인 Nodular 거더의 공정관리를 위한 자원 및 공정계획 최적화 시스템 개발이다. 인력, 장비 동원 계획의 다양한 변수를 자동으로 테스트하여 최적의 값을 도출하는 시뮬레이션 알고리즘을 개발한다. 그리고, 건설 중인 파주-포천 고속도로 건설공사(3공구) 도하 4교에 알고리즘을 적용하여 그 결과를 비교한다. 건설공사 표준품셈을 근거로 액티비티 카드에 실제 투입된 인력, 장비 종류, 수량 등을 적용하고, 작업량, 자원계획, 자원소요량을 반영했다. 향후 다양한 현장 데이터를 포함한 예측기법을 적용하여 프로그램의 정확도를 높일 계획이다. 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.

고주파 영역 자속 스펙트럼 감시에 의한 전동기 고정자 고장예측

김대영,여영구,이재헌,Kim, Dae-Young,Yeo, Yeong-Koo,Lee, Jae-Heon 한국플랜트학회 2012 플랜트 저널 Vol.8 No.3

현재 운영 중인 발전소 전동기의 고정자 권선 고장 실제사례를 토대로 전동기에서 발생하는 자속 데이터의 고주파 영역 스펙트럼을 분석함으로써 결함이 있는 전동기와 건전한 전동기의 자속 특성 및 변화추이를 분석하였다. 전동기 자속스펙트럼의 고주파 영역을 분석한 결과 결함이 있는 전동기는 고정자 슬롯 주파수 대비 고정자 슬롯 사이드밴드 주파수의 상대적 크기 비율이 건전한 전동기에 비해 매우 높음을 확인하였다. 또한 결함이 있는 전동기는 시간이 지날수록 고정자 슬롯 주파수 대비 고정자 슬롯 사이드밴드 주파수의 상대적 크기 비율 크기도 더욱 커지는 현상도 확인하였다. 그리고 결함이 있는 전동기의 자속 데이터는 불시 고장 1개월여 전부터 결함 상태를 인식할 수 있는 신호를 나타냄으로써 전동기 고정자 권선 결함에 대한 사전 예측능력이 매우 탁월함을 확인하였다. In this study, the way how we can find the defects of motor windings in advance will be discussed. The magnetic flux spectrum in the high frequency region of the large motor was analyzed based on the actual fault practices related with motor windings. In case of defective motor relative amplitude ratio of the stator slot frequency to its sideband was very high compared to that of healthy motor. And the defective signal related with motor windings was indicated in advance in the magnetic flux spectrum prior to over 1 month before failure. Considering this aspect it can be estimated that magnetic flux spectrum in the high frequency region has the excellent predictive diagnostic capability.

카오스 암호를 이용한 개선된 암호화 웹 메일 시스템의 설계와 구현

김대영,김태식,Kim Dae-Young,Kim Tae-Sik 한국정보처리학회 2006 정보처리학회논문지D Vol.13 No.3

스트림 암호 시스템을 중심으로 한 카오스 암호 시스템은 원문의 길이가 클수록 암복호화 및 송수신 속도가 떨어지는 단점을 보여왔다. 본 연구에서는 원문의 길이가 길수록 기존의 웹 메일 시스템에 비해 더욱 우수한 성능을 보이고 있는 암호화 웹 메일 시스템을 설계 구현하였다. 암호화 웹 메일 시스템구현에서 키 수열 생성, 원문의 암복호화, 내외부 메일 뷰어 등을 개발하였고, 성능 평가 결과 암복호화 및 송수신 속도에서 우수한 것으로 평가되어 스트림 암호 시스템이 갖는 단점을 보완하였다고 할 수 있다. 앞으로 지속적인 응용 연구를 통해 암호화 기술을 기반으로 한 서버 시스템 보안 및 파일 보안, 인터넷 정보의 보안, 전자 상거래 시스템의 정보 보호 등 여러 분야에서 블록 암호 시스템을 대체할 수 있는 새로운 범용 암호 시스템으로 활용 할 수 있을 것으로 기대된다. A chaos cipher system that focuses on the stream cipher system has a demerit that the longer the text is, the slower the speed of the encryption and description and the transmission and reception. On this study, we designed the cipher web mail system showing much better capabilities than the existing web mail system as the text is longer. In the embodiment of the cipher web mail system, we developed the key stream, the encryption and description of the text and the inside and outside mail viewer and so on. After the efficiency test, it was valued high in the respect of the speed of the encryption and description and the transmission and reception. And it made up for the defect of the stream cipher system. We expect that we can use it through the persistent applied study in the server system security, the file security, the security of the internet information, the protection of the e-commerce system information and other fields based on the cipher technique as the wide use cipher system that can replace the block cipher system.

주 조절점 핸들링이 편마비 환자의 한발서기 자세적응에 미치는 영향 - 보바스의 신경발달치료 중심 -

김대영,Kim, Dae-Young 대한물리치료과학회 2001 대한물리치료과학회지 Vol.8 No.2

This study is aimed at diagnosing transmutation aspect with the respective of hemiplegia patient's static adaptation of posture which is influenced by anti-gravity excercise, center of gravity shifting movement and segmental movement adaption of the legs and arms by key-point control in the process of Bobatli's treatment approach. The patients for the investigation of this study were selected as a total 17 patients who were doing the physical-therapy in Tae-gu Rehabilitation Center, and diagnosed as hemiplegia patients by Rehabilitation Medicine department in Kyung-buk University hospital. And also, there investigated into temporal transition that keep the attitude with one-leg standing on the ground concerning static attitude adaption on the basis of the before of anti-gravity movement and the after of 4-weeks movement. The findings of this study were as follows: With the respective the time to keep standing pose by one-leg at static attitude transmutation, affected side showed meaningful differences as a l.86/sec, 2.62/sec at 4 weeks later considering the before and after of this experiment.(p<0.01), non-affected side at the aspect of attitude keeping time, but there didn't showed meaningful differences statistically.