• 국제학술발표논문집
• /
• The 5th International Conference on Construction Engineering and Project Management
• /
• pp.274-278
• /
• 2013

Over the past several years, the building codes that govern commercial building construction have become increasingly prescriptive in nature, specifying detailed information related to the design and installation of the systems, while offering no reasoning behind their prescriptive measures. For example, metal stud framing is commonly used in commercial building construction to create bearing walls and non-bearing partition walls. BIM provides a powerful platform for developing and implementing "pre-planning" tools and methods to facilitate both engineering and administrative controls during construction. This paper discusses the use of BIM to enhance constructability for commercial building construction activities, specifically metal stud framing. Using specific real-world examples this paper demonstrates ways that BIM can be used to foresee potential construction issues and motivates and informs future uses of BIM technologies

• Corrosion Science and Technology
• /
• 제23권3호
• /
• pp.228-234
• /
• 2024

Zinc wiping is a phenomenon used to control zinc-coating thickness on steel substrate during hot dip galvanizing by equipment called air knife. Uniformity of zinc coating weight in length and width profile along with surface quality are most critical quality parameters of galvanized steel. Deviation from tolerance level of coating thickness causes issues like overcoating (excess consumption of costly zinc) or undercoating leading to rejections due to non-compliance of customer requirement. Main contributor of deviation from target coating weight is dynamic change in air knives equipment setup when thickness, width, and type of substrate changes. Additionally, cold coating measurement gauge measure coating weight after solidification but are installed down the line from air knife resulting in delayed feedback. This study presents a coating weight control model (Galvantage) predicting critical air knife parameters air pressure, knife distance from strip and line speed for coating control. A reverse engineering approach is adopted to design a predictive, prescriptive, and descriptive model recommending air knife setups that estimate air knife distance and expected coating weight in real time. Implementation of this model eliminates feedback lag experienced due to location of coating gauge and achieving setup without trial-error by operator.

• 경영과학
• /
• 제4권
• /
• pp.60-75
• /
• 1987

This paper introduces the outlines of the state-of-the-art in studying FMSs using analytical queueing network models. These include Jackson networks, reversible networks and approximate models of non-product-form networks. the focus is on identifying the major features of models as they relate to the operational characteristics of FMSs. Prescriptive models concerning the optimal design and/or operational control of FMS networks are also discussed. We notice that the presentation of materials in this paper basically follows Yao and Buzacott, On Queueing Network Models of Flexible Manufacturing Systems(FMSs), invited and published on Queueing Systems, Theory and Application 1(1986). For other analytical models of FMSs, refer to Buzacott and Yao, Flexible Manufacturing Systems : A Review of Analytical Models, Management Science 32, No.7(1986).

• Wind and Structures
• /
• 제30권4호
• /
• pp.379-392
• /
• 2020

The paper presents a Life-Cycle Cost-based optimization framework for wind-excited tall buildings equipped with Tuned Mass Dampers (TMDs). The objective is to minimize the Life-Cycle Cost that comprises initial costs of the structure, the control system and costs related to repair, maintenance and downtime over the building's lifetime. The integrated optimization of structural sections and mass ratio of the TMDs is carried out, leading to a set of Pareto optimal solutions. The main advantage of the proposed methodology is that, differently from the traditional optimal design approach, it allows to perform the unified design of both the structure and the control system in a Life Cycle Cost Analysis framework. The procedure quantifies wind-induced losses, related to structural and nonstructural damage, considering the stochastic nature of the loads (wind velocity and direction), the specificity of the structural modeling (e.g., non-shear-type vibration modes and torsional effects) and the presence of the TMDs. Both serviceability and ultimate limit states related to the structure and the TMDs' damage are adopted for the computation of repair costs. The application to a case study tall building allows to demonstrate the efficiency of the procedure for the integrated design of the structure and the control system.

• Structural Engineering and Mechanics
• /
• 제43권4호
• /
• pp.545-560
• /
• 2012

Design codes provide the minimum requirements for the design of code-compliant structures to ensure the safety of the life and property. As for code-exceeding buildings, the requirements for design are not sufficient and the approval of such structures is vague. In mainland China in recent years, a large number of code-exceeding tall buildings, whether their heights exceed the limit for the respective structure type or the extent of irregularity is violated, have been constructed. Performance-based seismic design (PBSD) approach has been highly recommended and become necessary to demonstrate the performance of code-exceeding tall buildings at least equivalent to code intent of safety. This paper proposes the general methodologies of performance-based seismic analysis and design of code-exceeding tall buildings in Mainland China. The PBSD approach proposed here includes selection of performance objectives, determination of design philosophy, establishment of design criteria for structural components and systems consistent with the desirable and transparent performance objectives, and seismic performance analysis and evaluation through extensive numerical analysis or further experimental study if necessary. The seismic analysis and design of 101-story Shanghai World Financial Center Tower is introduced as a typical engineering example where the PBSD approach is followed. The example demonstrates that the PBSD approach is an appropriate way to control efficiently the seismic damage on the structure and ensure the predictable and safe performance.

• 국제초고층학회논문집
• /
• 제1권3호
• /
• pp.195-201
• /
• 2012

Today, a great effort to develop PBSD procedure to be utilized in Korea is given by domestic structural engineers, academics, and governmental organizations. After Great East Japan Earthquake (2011) took place, lots of clients in Korea became to concern of their buildings so that requests of seismic performance evaluation and seismic rehabilitation for existing buildings have been gradually increased. Such interests in seismic events initiated a rapid development of a series of guidelines for seismic performance evaluation and seismic performance enhancement. For new buildings, however, design guidelines for PBSD are yet well prepared in Korea and prescriptive design methods are dominant design procedure still. Herein, seismicity demands used in seismic performance evaluation and some important design parameters in NLRH are introduced. Some project examples for seismic performance evaluation and rehabilitation applying passive energy dissipation devices are also described in the latter part of paper.

• Child Health Nursing Research
• /
• 제20권4호
• /
• pp.264-274
• /
• 2014

목적 본 연구의 목적은 국내 간호학분야에서 수행된 양육에 대한 연구논문을 양육의 속성과 지식체 유형을 중심으로 분석하여 추후 자녀양육에 대한 연구와 간호실무의 방향을 설정하는 근거자료를 제시하는 것이다. 방법 KoreaMed, 한국학술정보, 과학기술정보통합서비스, 과학기술학회 마을, 한국교욱학술정보원의 5개 온라인 사이트를 통해 201편의 논문을 선정하였고, 개념을 양육의 속성과 지식체 유형별(기술적, 설명적, 처방적 지식)로 분석하였다. 결과 연구설계는 실험연구가 27.3%, 비실험연구가 72.7%였고, 연구대상자는 양육자로는 어머니가 가장 많았고(36.0%), 피양육자로는 신생아가 가장 많았다(29.6%). 양육속성별로는 양육에 대한 반응 영역이 가장 많았고(49.9%), 양육지식 영역이 가장 적었다(2.2%). 양육속성의 하위영역별로는 양육에 대한 반응 영역에서는 양육스트레스, 양육자신감/효능감 양육태도 등의 순이었고, 양육실제 영역에서는 애착, 부모-자녀 상호작용, 양육행동/양육실천 등의 순으로 나타났다. 아동의 성장/발달/행동 영역에서는 영아의 성장과 발달, 행동/건강 문제 등의 순으로 나타났다. 지식체 유형별로는 설명적 지식이 가장 많았고(55.2%), 처방적 지식(30.0%), 기술적 지식(14.9%)의 순으로 나타났다. 결론 자녀양육과 관련하여 다양한 지식체가 개발되었으나 처방적 지식의 개발이 미흡하며, 발달단계별 양육과 어머니 외의 다른 양육자 대상 연구가 부족하였고, 양육의 실제적인 측면보다는 양육에 대한 반응에 관한 연구가 더 많았다. 따라서 양육의 공동 책임자인 아버지와 대리 양육자 대상의 연구, 아동의 발달 단계별 건강을 위한 아동간호학의 차별화된 지식 개발 연구, 양육실제를 유도하는 처방적 지식을 개발하는 연구와 아동양육의 국가적 중요성을 감안하여 아동양육정책 개발 연구를 제언한다.

• 비파괴검사학회지
• /
• 제24권2호
• /
• pp.186-196
• /
• 2004

각 국의 법령에서는 원자력발전소에서 발생할 수 있는 사고로부터 국민의 건강과 재산을 보호하기 위해 원자력발전소의 압력경계 주요 용접부 등에 대해서는 주기적으로 열화의 정도를 파악하기 위한 가동중 비파괴검사를 수행하도록 규정하고 있으며, 이를 뒷받침하기 위한 가동중검사 기술기준을 제정하여 이행하고 있다. 최근 리스크를 반영한 가동중검사 프로그램을 개발하여 적용을 시도하고 여지만, 기존의 결정론적 검사대상 선정 프로그램은 아직도 상당한 의미가 있다고 할 수 있다. 본 논문에서는 가동중검사에 관한 선진국 즉 미국, 프랑스, 캐나다, 일본 등의 기술기준과 IAEA에서 제시하는 안전지침의 비교검토를 통하여 현재 국내 가동중검사 기술기준의 개선방안을 모색하고자 하였다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
• /
• pp.5-21
• /
• 2006

Traditional standards and specifications for concrete have largely been prescriptive, (or prescription-based), and can sometimes hinder innovation and in particular the use of more environmentally friendly concretes by requiring minimum cement contents and SCM replacement levels. In December 2004, the Canadian CSA A23.1-04 standard was issued which made provisions (a) for high-volume SCM concretes, (b) added new performance requirements for concrete, and (c) clearly outlined the requirements and responsibilities for use in performance-based concrete specifications. Also, in December 2003, the CSA A3000 Hydraulic Cement standard was revised. It (a) reclassified the types of cements based on performance requirements, with both Portland and blended cements meeting the same physical requirements, (b) allows the use of performance testing for assessing sulphate resistance of cementitious materials combinations, (c) includes an Annex D, which allows performance testing of new or non-traditional supplementary cementing materials. From a review of international concrete standards, it was found that one of the main concerns with performance specifications has been the lack of tests, or lack of confidence in existing tests, for judging all relevant performance concerns. Of currently used or available test methods for both fresh, hardened physical, and durability properties, it was found that although there may be no ideal testing solutions, there are a number of practical and useful tests available. Some of these were adopted in CSA A23.1-04, and it is likely that new performance tests will be added in future revisions. Other concerns with performance standards are the different perspectives on the point of testing for performance. Some concrete suppliers may prefer processes for both pre-qualifying the plant, and specific mixtures, followed only with testing only 'end-of-chute' fresh properties on-site. However, owners want to know the in-place performance of the concrete, especially with high-volume SCM concretes where placing and curing are important. Also, the contractor must be aware of, and share the responsibility for handling, constructability, curing, and scheduling issues that influence the in-place concrete properties.