• 한국산학기술학회논문지
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• 제19권12호
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• pp.677-685
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• 2018

건설공사에서 공정관리는 기본적으로 가장 중요한 단계이며, 효율적인 공정관리를 위해서는 합리적 공정표 작성이 우선시 되어야 한다. 설계단계에서는 기상조건과 현장 특성을 고려한 다양한 조건과 공법의 비교 검토를 통해 최적의 공사 기간을 산정할 수 있으나, 기획단계에서 기본적인 자료(D/B) 분석만으로는 효율적 공법 선정과 적정한 공사 기간 산정이 어렵다. 따라서, 기획단계에서 기존시가지의 공동구 건설시 표준공기 분석을 위하여, 본 논문에서는 공동구 형식을 개착식 및 터널식으로 구분하고, 각 형식의 특성과 기존시가지의 조건을 고려한 공법을 선정 하도록 하였다. 합리적인 공기 계산을 위하여 외부 공사에 영향을 주는 기상조건을 고려하여 년 간 가동율을 산정 하였으며, 개착식은 RC 공법/터널식은 Shield TBM 공법에 대한 단위공정을 분석하였다. 각 단위공정을 종합하여 연장 1,200m, 환기구 200m 간격으로 가정한 공사의 표준공기를 산정한바, 개착식은 893일, 터널식은 616일이 소요되는 것으로 분석 되었다. 본 연구의 결과는 기획단계에서 보다 쉽게 공동구 형식 선정과 표준공기 산정에 도움이 될 것이며, 추후 설계단계에 연계하면 공정 및 공사비 산정이 용이할 것으로 판단된다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2006년도 추계학술발표대회 논문집
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• pp.109-114
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• 2006

Since 1970, concentrated development in Gang-nam caused serious differences with Gang-buk, such as housing environment, education, culture, industry, economy, and consumption behavior as well as Urban Infrastructure. In this result, the government has executed New Town project to solve these matters, but the residents' opinion wasn't reflected. The purpose of this study is to research New Town project district residents' consciousness and prefered image for housing and this research will be applied to basic study for housing environment improvement policy in future. The results of this study are summerized as follows : First, living satisfaction is revealed almost low level, and the most demands for improvement are to solve lacks of park and green yard. Second, image of Gang-nam, which of housing environment is better than Gang-buk, is expressed as the words, 'Complicated', 'Complex', 'Polished', 'Convenient', 'Rich'. Third, prefered types of housing are high-rise Residental Complex, Apartment mixed with detached housing, and tower-type apartment. And These are connected with there values

• KIEAE Journal
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• 제9권5호
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• pp.85-96
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• 2009

This study analyzed a characteristic by types of urban regeneration helping the establishment of urban identity under social condition change. It will be foundation of sustainable urban development with strategy that secures world-wide competitive power. For this, sample cases that established identity from urban regeneration were reviewed about the main subject and the supporting subject in business side and hardware, software, system, and finance in design factors. 4samples each in inheritance intensification type and change creation type were selected and analyzed. The result said it is most effective to establish urban identity when inheritance intensification type is the private-centered for urban regeneration. And it is better to do the project that the main subject and the supporting subject are taken by the private or the private-leading partnership. It is necessary to manage the region and plan events with software design factors more than hardware design factors. In addition, for urban identity, it was found to be desirable to utilize and preserve fully current resources such as historical scenery and activate the communities than making new facilities. On the contrary, the project based on change creation type needs to be under the public management with innovative idea. Also, when it comes to design factors, facilities related to culture and art and community spaces should open and run actively. It is important for the region to improve its image by New design style such as TOD. In software side, it is important to manage the region by monitoring about urban regeneration business and solve social mix and employment problem. On the other hand, in terms of system and administration, both types don't show a difference in urban identity establishment, since it is same that both should make partnership and get a support of subsidy to be most effective.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.788-793
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• 2009

Constructing substructures by using Top-Down or Downward method needs an efficient formwork system because of difficulties in supporting concrete slabs from the bottom while excavation is in process. Existing underground formwork systems can be classified by three types: graded ground supported type (Slab On Grade, Beam On Grade), suspension type (Non Supporting Top Down Method), and bracket supported type (Bracket Supported R/C Downward). Each method has its own advantages and limits. Application of a specific formwork system for a given construction site is determined by various conditions and affect construction time and cost. This paper presents a newly developed underground non-supporting formwork system, which combines the advantages of a suspension type and a bracket supported type while it overcomes limits of two types. The developed system has a moving formwork which is supported by suspension cables hanging from the bracket placed at the top of pre-installed substructure columns. Then, the moving formwork is repeatedly lowered down for the next floor below to support concrete slab during curing. The details of this bracket and cable supported system have been investigated for the improvement of easiness in construction.

• 대한의생명과학회지
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• 제19권3호
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• pp.266-269
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• 2013

Hox genes encode transcription factors important for anterior-posterior body patterning at early stages of embryonic development. However, the precise mechanisms by which signal pathways are stimulated to regulate Hox gene expression are not clear. In the previous study, protein kinase B alpha (Akt1) has been identified as a putative upstream regulator of Hox genes, and Akt1 has shown to regulate Gcn5, a prototypical histone acetyltransferase (HAT), in a negative way in mouse embryonic fibroblast (MEF) cells. Since the activity of HAT such as the CBP/p300, and PCAF (a Gcn5 homolog), was down-regulated by Akt through a phosphorylation at the Akt consensus substrate motif (RXRXXS/T), the amino acid sequence of Gcn5 protein was analyzed. Mouse Gcn5 contains an Akt consensus substrate motif as RQRSQS sequence while human Gcn5 does not have it. In order to see whether Akt1 directly binds to Gcn5, immunoprecipitation with anti-Akt1 antibody was carried out in wild-type (WT) mouse embryonic fibroblast (MEF) cells, and then western blot analysis was performed with anti-Akt1 and anti-Gcn5 antibodies. Gcn5 protein was detected in the Akt1 immunoprecipitated samples of MEFs. This result demonstrates that Akt1 directly binds to Gcn5, which might have contributed the down regulation of the 5' Hoxc gene expressions in wild type MEF cells.

• 한국농공학회논문집
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• 제60권4호
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• pp.15-25
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• 2018

The accident risk at the construction workplace associated with agricultural engineering is comparatively higher than those of other fields due mainly to its complex work types and processes. Agricultural engineering deals with a variety of agricultural infrastructures from irrigation and drainage facilities to giant-scale coastal reclamation land infrastructures. The characteristics that most agricultural projects have conducted on a small-scale even worsen the situation drawing low attentions to risk management. Therefore, systematical risk assessment that focuses on details of agricultural construction work process is required in order to enhance safety management capacity and to prevent repetitive accidents ultimately. This study aims to categorize construction work types and processes of agricultural construction works, and to quantitatively assess the accident risk of them based on accident analysis. Regarding classification of construction works, actual 827 accident cases were thoroughly reviewed and coded by their construction site, facility and work type, project scale and so on. Most accidents (71.8 % of total cases) occurred in small-scale construction workplaces with less than 5 billion Korean won project budget. And those accidents related to agricultural infrastructure project (37.4%) and agricultural water development project (22.4%). In terms of work types, accidents frequently took place in form-work followed by pipe installation work, steel bar work and concrete work. The potential risks were compared with actual outbreak of accidents based on Analytic Hierarchy Process (AHP). The results show that the potential conditions of accident expected to be took place is somewhat different from the actual conditions where accidents actually happened. This implicates that risk management manuals or education needs to be adjusted by reflecting unexpected circumstances. Overall, this study is meaningful in that the results could be foundations as to strengthen risk management capacity for agricultural engineering projects.

• 환경영향평가
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• 제15권5호
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• pp.289-297
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• 2006

The study investigates the problems of silt protector used for mitigation measure of suspended sediments (SS) during coastal construction and provides their improvements based on the field investigation and analysis of the environmental impact assessment reports for the coastal development projects of Korea. The field investigation along west, east and south coasts of Korea reveals a variety of problems in the installation and management of silt protector solely used for the SS mitigation in Korea. Major problems include installation itself, low cost and quality of silt protector, and maintenance. These problems superimpose the effectiveness of silt protector in mitigating coastal environment impact. The present study provides the specific guideline on the project type needed for the installation of silt protector, installation standard and planning, maintenance and management. The study also suggests new mitigation options such as environmental window to limit the construction period and environmental dredger to compensate for the deficits of silt protector.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2003년도 International Symposium
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• pp.109-119
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• 2003

o In order to start SIP Project .Marketing (& ASIC team) should present biz planning, schedule, device/SIP specs., in SIP TFT prior to request SIP development for package development project. .In order to prevent (PCB) revision, test, burn-in, & quality strategy should be fixed by SIP TFT (PE/Test, QA) prior to request for PKG development. .Target product price/cost, package/ test cost should be delivered and reviewed. o Minimum Information for PCB Design, Package Size, and Cost .(Required) package form factor: size, height, type (BGA, QFP), Pin count/pitch .(Estimated) each die size including scribe lane .(Estimated) pad inform. : count, pitch, configuration(in-line/staggered), (open) size .(Estimated) each device (I/O & Core) power (especially for DRAM embedded SIP) .SIP Block diagram, and net-list using excel sheet format o Why is the initial evaluation important\ulcorner .The higher logic power resulted in spec. over of DRAM Tjmax. This caused business drop longrightarrow Thermal simulation of some SIP product is essential in the beginning stage of SIP business planning (or design) stage. (i.e., DRAM embedded SIP) .When SIP is developed using discrete packages, the I/O driver Capa. of each device may be so high for SIP. Since I/O driver capa. was optimized to discrete package and set board environment, this resulted in severe noise problem in SIP. longrightarrow In this case, the electrical performance of product (including PKG) should have been considered (simulated) in the beginning stage of business planning (or design).

• 한국건축시공학회지
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• 제8권3호
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• pp.59-67
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• 2008

Recently, domestic construction companies have been moving towards overseas markets due to decreasing orders and an increase in competitiveness within the domestic market. However, there is a higher risk involved in the overseas construction Industry than in the domestic construction industry. Especially, because domestic construction companies lack development's experience, such a companies have a weakness of hidden risk factors. For Overseas New Town development project's success of domestic construction companies, preferentially, It Is necessary to deduce and analysis of risk factors in real estate development phases. This study would possibly be able to provide the preliminary data for Overseas New Town development projects in the future.

• 한국건축시공학회지
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• 제20권1호
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• pp.83-91
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• 2020

최근의 교량 건설 프로젝트는 교량 건설의 증가추세에 따라 위험 손실에 대비하기 위해 보다 정교한 리스크 관리 조치와 손실 예측을 요구하고 있다. 본 연구는 교량 건설 사업에 대한 국내 주요 보험사의 과거 보험료 지급 실적을 토대로 실제 교량 건설에서 목적물의 손실을 유발하는 위험 요인을 분석하고, 정량화된 예측 손실 모델을 개발하고자 하였다. 정량적 교량건설 손실모형 개발을 위해 사고 건당 보험지급액을 총공사비로 나눈 손실비율을 종속변수로 선정하였고, 독립변수로는 1)기술적 요인: 상부 구조 유형, 하부 구조 유형, 상부 가설방법, 교량 길이 2) 자연재해요인 : 태풍, 홍수 3) 프로젝트 정보: 공사기간, 총공사비를 채택하였다. 선정된 독립변수 중 상부구조, 가설방법 및 프로젝트 기간이 교량건설 손실 비율에 영향을 미치는 지표로 나타났다. 본 연구 결과로 도출된 리스크 지표와 손실예측 함수는 정부 관련기관, 교량 건설 설계 및 시공사, 보험회사에 정량적 피해 예측 및 위험 평가 서비스를 제공하며, 향후 기초 교량 리스크 평가 개발 연구의 가이드라인으로 활용할 수 있다.