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.

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)

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.

바람과 대공간 구조물

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

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.

TBM 디스크 커터의 수명 예측 방법 개발

김대영,에브라힘,정재훈,이재원,지성현,Kim, Dae-Young,Farrokh, Ebrahim,Jung, Jae-Hoon,Lee, Jae-Won,Jee, Sung-Hyun 한국터널지하공간학회 2017 한국터널지하공간학회논문집 Vol.19 No.3

암반용 TBM 공사에서 디스크 커터의 마모도 예측은 설계 및 시공 단계에서 정확한 공사비와 공사기간을 추정하는데 중요한 요소이다. 디스크 커터 마모도 예측에 널리 사용되고 있는 방법으로는 CSM 모델, 노르웨이 NTNU 모델, Gehring 모델이 있으며, 이들 모델은 각각 세르샤 시험, NTNU 시험 결과로부터 도출된 디스크 커터의 마모지수와 수명 지수를 활용하고 있다. 세르샤 시험은 금속 핀을 이용하여 일방향으로 마모를 발생 시키기 때문에 광물 입자크기나 암석의 이방성에 따라 결과의 편차가 큰 것으로 조사되었다(SINTEF, 2013). 한편, NTNU 시험의 경우에 시료 성형을 위한 사전 작업이 필요하기 때문에 수행 완료까지 2~3일의 기간이 소요된다. 본 연구에서는 금속 디스크의 회전과 이와 직교되는 방향으로 이동하면서 양방향 마모를 발생시켜 마모시험 결과의 편차를 줄이고, NTNU 시험 대비 별도의 시료성형이 필요 없어 소요 시간을 1~2시간으로 단축할 수 있는 새로운 디스크 커터 마모도 예측시험과 이를 이용한 마모지수를 제안하였다. 제안된 마모 지수는 동일 암석을 이용한 세르샤 시험과 NTNU 시험결과와 비교하여 높은 상관관계를 갖는 것으로 나타났다. 또한 국내 외 TBM 현장의 암석 시편을 이용하여 시험결과와 현장의 실제 디스크 커터 마모량을 비교 검증하였으며, 95%의 높은 결정계수를 확인하였다. NAT 시험은 신속하게 시험 수행이 가능하고, 시험 결과로부터 제안된 마모지수가 높은 신뢰수준을 보이는 것으로 판단되어 향후 활용도가 높을 것으로 기대한다. Wear prediction of TBM disc cutters is a very important issue for hard rock TBMs as number of cutter head intervention. In this regard, some model such as NTNU, Gehring model, CSM models have been used to predict disc cutter wear and intervention interval. There are some deficiencies in these models. This paper developed a new test method for wear prediction for TBM disc cutter and proposed a new abrasion index. In this regard, different abrasivity indices along with their testing methods are explained. A comparative study is performed to develop the predictability of different cutter life evaluation methods and index. The evaluation of the new methods proposed in this paper shows a very good agreement with the actual cutter life and intervention interval length. The proposed tester and index can be easily used to predict the intervention interval length and cutter wear evaluation in both planning and construction stages of a TBM tunneling project.

린 건설 수행에 따른 인적자원의 동기유발

김대영,Kim, Dae-Young 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.3

린 건설이 소개되어진 이후 많은 린 건설 관련 연구들이 진행되어지고 있다. 하지만 기존의 연구들은 린 건설 개념과 기법 개발에 중점을 두고, 기계적 합리성과 기술적 효율성만을 향상시키는데 그 초점을 맞추고 있으며, 린 건설의 인적 자원 측면에서의 연구는 거의 이루어지지 않고 있다. 따라서 도입 초기 단계인 국내의 린 건설의 활성화와 보급화를 위해서는 한번쯤 이러한 연구가 이루어져야 할 것으로 생각된다. 왜냐하면 린 건설 도입 초기 단계에 있어서 린 건설에 필요한 많은 기능들을 수행하고 이의 잠재성을 성공적으로 이끌어내기 위해서는 참여 건설 인력의 잠재성과 능력에 상당 부분 의존할 수 발 에 없기 때문이다. 본 연구에서는 국내 현장 조사에 앞서 미국 내 린 건설을 적용하고 있는 건설 현장의 원도급자와 하도업자를 포함한 작업 인력들에 대해 설문조사 및 인터뷰를 통해 린 건설이 인적자원과 어떠한 관련이 있으며 어떤 효과를 제공할 수 있는 지에 관하여 분석하고자 한다. 본 연구의 결과는 린 건설이 건설 현장에서 적절히 도입되고 수행되어질 경우 인적 자원의 능력 향상 및 작업 동기 유발에 큰 도움이 될 수 있음을 보여준다. 린 건설은 무엇보다도 공사 참여자들 간의 관계 개선에 중점을 두고 있기 때문에 린 건설을 수행하는데 있어서 인적자원과의 연관성을 잊어서는 안 될 것이다. Since Lean Construction has been introduced in 1992, much research is in progress to popularize lean concepts and principles. Most research focuses on developing lean concepts and tools and strengthening the limited domain of instrumental rationality and technical efficiency. However, the basic concepts of human resource management seem to be ignored by those who advocate lean production. Thus, the lean construction research related to human resource management must be once considered for popularization and activation of lean construction at the beginning stage in the domestic construction industry. Because human resources have a major influence on lean implementation and its success, especially at the beginning stage of lean construction. This paper considers the human resource requirements for the implementation of lean construction in the USA construction industry. The results from the study will provide the foundations to adapt lean construction into the domestic construction industry. Consequently, the study found that lean construction could improve the capability of human resource and human motivation if effectively implemented in the construction sites. Since lean construction emphasizes and focuses on improvement of relationships among project participants, constant application to human resource management is crucial for successful lean implementation.

Synthesis and Antimicrobial Activity of 7-(1,3-Dihydropyrrolo[3,4-b]pyridin-2-yl)quinolone-3-carboxylic Acid

김대영,정인창,이재욱,윤길중,Kim, Dae Young,Jung, In Chang,Lee, Jae Wook,Yoon, Geal Jung Korean Chemical Society 1998 대한화학회지 Vol.42 No.1

설계공모 - 서울시립도서관(서대문)

김대영,Kim, Dae Young 대한건축사협회 2023 建築士 Vol.645 No.-

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.