• Structural Engineering and Mechanics
• /
• 제43권2호
• /
• pp.225-237
• /
• 2012

This paper presents an experimental investigation of the flexural behavior of square hollow steel section (HSS) beams subjected to pure bending. Totally six unfilled and nine ultra high performance concrete (UHPC)-filled HSS beams were tested under four-point bending until failure. The effects of the steel tube thickness, the yield strength of the steel tube and the strength of concrete on moment capacity, curvature, and ductility of UHPC-filled HSS beams were examined. The performance indices named relative ductility index (RDI) and strength increasing factor (SIF) were investigated with regard to different height-to-thickness ratio of the specimens. The flexural strengths obtained from the tests were compared with the values predicted by Eurocode 4, AISC-LRFD and CIDECT design codes. The results showed that the increase in the moment capacity and the corresponding curvature is much greater for thinner HSS beams than thicker ones. Eurocode 4 and AISC-LRFD predict the ultimate moment capacity of the all UHPC-filled HSS beams conservatively.

• 한국군사과학기술학회지
• /
• 제10권3호
• /
• pp.100-108
• /
• 2007

The purpose of the research is to propose an integrated project planning process and its implementation method. Although there is increasing interest in the application of the Earned Value Management(EVM) method in the project management area, the progress and maturity of the technical performance have not been included in assessing the Earned Value. The main concept of the planning process is to use cost, schedule, as well as the technical performance in the assessment of the Earned Value Management for Military R&D project management practices. The resulting process can enhance the efficiency of the project work by eliminating the currently duplicated activities between traditional project planning process and the newly implemented Earned Value Management process and by shortening the early planning process duration of projects adopting EVM practices.

• ETRI Journal
• /
• 제41권2호
• /
• pp.145-159
• /
• 2019

To reduce the number of radio frequency (RF) chains in multiple input multiple output (MIMO) systems, generalized spatial modulation (GSM) techniques have been proposed in the literature. In this paper, we propose a zero-forcing (ZF)-based detector, which performs an initial pruning of the search tree that will be considered as the initial condition in a sphere decoding (SD) algorithm. The proposed method significantly reduces the computational complexity of GSM systems while achieving a near maximum likelihood (ML) performance. We analyze the performance of the proposed method and provide an analytic performance difference between the proposed method and the ML detector. Simulation results show that the performance of the proposed method is very close to that of the ML detector, while achieving a significant computational complexity reduction in comparison with the conventional SD method, in terms of the number of visited nodes. We also present some simulations to assess the accuracy of our theoretical results.

• 한국콘텐츠학회논문지
• /
• 제11권1호
• /
• pp.254-265
• /
• 2011

본 연구는 J도 소방안전본부 산하 119구급대 60명을 대상으로 하였으며, 연구 기간은 2009년 12월 1일 부터 2월 10일까지였다. 어려운 기관내삽관 교육 전.후 비교 및 일반적 특성에 따른 지식, 자신감, 학업적 자기효능감, 술기수행 능력을 SPSS 14.0을 이용하여 분석한 결과는 다음과 같다. 1. 지식, 자신감, 학업적 자기효능감, 술기수행 능력 모두 교육 전보다 교육 후 유의미하게 증가하였다. 2. 일반적 특성에 따른 교육 전 후 지식은 성별과 병원근무경력에서 모두 유의한 차이를 보였고, 자신감은 계급과 병원경력에서 모두 유의한 차이를 보였다. 학업적 자기효능감은 계급과 병원경력 및 학력에서 모두 유의한 차이를 보였다. 술기수행 능력은 유형 1에서 119구급대 근무경력, 유형 2에서는 대원의 연령과 최종학력이 유의한 차이를 보였으며, 유형 3은 119구급대 근무경력과, 병원에서 근무경력이 교육 후 유의한 차이를 보였다. 유형 4는 연령과 계급에서 교육 전 후 유의한 차이를 보였다. 결론적으로, 119구급대의 기도유지술에 관심을 갖고, 정확한 기관내삽관을 배울 수 있도록 자신감을 함양시킬 수 있는 교육 프로그램이 절실히 필요하다고 사료된다.

• 한국안전학회지
• /
• 제35권2호
• /
• pp.8-16
• /
• 2020

In Article 311 of the Regulation on Occupational Safety and Health Standards requires the use of Korean Industrial Standards Act in accordance with the Industrial Standardization Act. However, the classification, inspection, maintenance, design, selection, and installation of explosion hazard locations for explosion and explosion prevention and internalization of 'safety' in the performance maintenance phase of electrical machinery and equipment There is no technical and institutional management plan for remodeling and alteration. Analysis of actual conditions and problems related to the installation, use, and maintenance of explosion-proof equipment, comparative analysis of domestic and international technical standards and systems, technical, institutional and administrative systems and systems related to installation, use, and maintenance of explosion-proof equipment, technical personnel and qualifications, etc. It is to propose legislation, system improvement, and technical standard establishment related to the maintenance of explosion-proof facility performance through improvement of the necessity and feasibility study for establishment of the legal status of the management site and management plan. As technical measures, KS standard revision (draft), KOSHA guide (draft) and explosion-proof facility performance maintenance manual were presented. In addition, the institutional management plan proposed the revised rule on occupational safety and health standards, the revised rule on the restriction of employment of hazardous work, and the manpower training program related to the maintenance of explosion-proof facilities and the qualification plan. Enhance safety at the installation, use, and maintenance stage of explosion-proof structured electrical machinery. It is expected to be used to classify explosion hazards, select related equipment, and to update and standardize standards related to installation, use and maintenance.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권4호
• /
• pp.81-95
• /
• 2020

The main objective of this research is to investigate the impact of board size and board composition on financial performance of banks. The sample of this study consists on two countries listed bank sector Pakistan and China. The annul data is used from 2009-2018 to find the objective of this study. The Panel regression model is used to check the relationship between dependent and independent variables. Return on Asset and Return on Equity is used as performance checker dependent variables. The results of this study confirm board size coefficient value positive for ROA and negative for ROE but shows insignificant behavior for Pakistani banking sector while in Chinese banking sector the coefficient value of board size positively for ROA and ROE at 10% level. The board composition coefficient shows the negatively significant with ROA but insignificantly related to ROE for Pakistani banking sector. However, in Chinese banking sector the coefficient value of board composition is insignificant for both ROA and ROE. This study is helpful for banks, management of banks, policy makers, researcher as well as Government.

• 한국섬유공학회:학술대회논문집
• /
• 한국섬유공학회 2007년도 학술발표회 논문집
• /
• pp.229-230
• /
• 2007

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2004년도 동계학술대회 논문집
• /
• pp.113-113
• /
• 2004

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2003년도 하계학술대회 논문집
• /
• pp.55-55
• /
• 2003

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2004년도 하계학술발표 논문집
• /
• pp.139-139
• /
• 2004