• Title/Summary/Keyword: construction time and costs

Search Result 383, Processing Time 0.025 seconds

Study on the Optimal Design of Automatic Data Recovery System in case of Communication Loss in Remote Management of Hydraulic Facilities (수리시설물 원격관리에 있어 통신두절시 데이터 자동복구 시스템 최적설계에 관한 연구)

  • Ahn, Tae-Hyung;Kim, Sang-Yu;Ko, Jeong-Min;Kim, Jae-Yeol
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.21 no.4
    • /
    • pp.46-52
    • /
    • 2022
  • In the existing wired communication network, wired communication is frequently interrupted by lightning, which accompanies rain, and remote management cannot be performed when it is actually necessary. In the case of communication interruption, field data stored in the database are lost, and data at an important point in time may go missing; this causes a decrease in the reliability of the stored data. Therefore, in this study, wireless communication using the Internet of Things (IoT) communication network of the 4th industrial technology is installed in the prototype to reduce wired communication construction costs, prevent resource waste and environmental damage due to communication facility construction, and prepare for communication loss.

Development of BIM Collaboration Framework Based on ISO 19650 (국제표준을 반영한 BIM 협업 프레임워크 개발)

  • Choi, Sung-Woo;Hyun, Keun-Ju;Kim, Hyeon-seung
    • Journal of KIBIM
    • /
    • v.13 no.4
    • /
    • pp.54-63
    • /
    • 2023
  • In recent years, the mandatory use of BIM has been actively promoted due to the digital transformation of the construction industry. However, the CDE (Common Data Environment) system, which is an essential element for operating BIM, has not been established in accordance with the domestic situation. To solve this problem, this study analyzed the results of previous studies, including the ISO 19650 standard and domestic CDE system requirements, and developed BIM-based collaboration functions that are suitable for the domestic construction industry through functional analysis of domestic and foreign commercial CDE solutions. And we developed a BIM collaboration framework to provide BIM-based collaboration functions as a service by using cloud technologies such as IaaS, PaaS, and SaaS to provide infrastructure resources flexibly and flexibly. The BIM collaboration framework developed in this study meets most of the CDE requirements of ISO1965, so it can secure competitiveness when bidding for overseas BIM projects. Also, because the BIM collaboration functions can be selectively applied to build a BIM-based collaboration platform, it is expected that the utilization of the BIM collaboration framework will be high, as it can minimize not only the time to build the platform but also the operating costs, and the usability is higher than that of existing commercial BIM CDE solutions.

An Analysis of the Mechanism of Crack Stop-bar for Floor Plastering of Apartment Buildings (공동주택 바닥미장 균열차단막의 메커니즘 분석)

  • Song, Yong-Sik;Lee, Dong-Hoon;Lee, Sung-Ho;Kim, Sun-Kuk
    • Journal of the Korea Institute of Building Construction
    • /
    • v.11 no.4
    • /
    • pp.333-344
    • /
    • 2011
  • The recent expansion in the number of housing construction projects has been accompanied by substantial improvements in construction quality, which can be attributed to the development of new construction technologies and materials. In apartment complex construction projects, numerous mechanization technologies have been adopted as part of the floor plastering process to counter increasing difficulties in securing labor and the pressing need to reduce lead time, but these have also triggered setbacks such as additional costs or loss of time to fix cracks in or loosening of floor. Cracks developing in the floor of an apartment housing unit, in terms of materials in use, are the products of a complex combination of material makeup, construction workmanship, concrete curing and the protection method. Controlling such elements from the perspective of materials in use may ensure partial success in reducing cracks, but fall short of eliminating them completely. Any attempt to prevent cracks from developing in the first place requires systematic analysis as to their potential causes and viable solutions to reduce them. On this backdrop, this paper aims to provide an analysis of potential causes of cracks found in floor plastering, and consider the mechanism of a crack stop-bar as a fundamental safeguard against them.

Evaluation of Installation Damage Factor for Geogrid using Maximum Particle Size of Backfill Material (뒤채움 최대입도를 이용한 지오그리드 보강재의 시공손상계수 산정 방법)

  • Kim, Kyung-Suk;Choi, Young-Chul;Kim, Tae-Soo;Lim, Seoung-Yoon
    • Journal of the Korean Geosynthetics Society
    • /
    • v.6 no.4
    • /
    • pp.29-37
    • /
    • 2007
  • Reduction Factor for Installation Damage required for calculation of design strength of geogrid used in MSEW(mechanically stabilized earth wall) design is usually obtained in the field test simulating real construction condition. However, damages occurred in geogrid during backfill work are influenced by many factors such as polymer types, unit weight per area, backfill construction method and gradation of backfill material and field test considering these factors demands lots of time and costs. In this study, factors affecting installation damage are analyzed and empirical method for evaluating reduction factor for installation damage using maximum particle size in backfill material is suggested.

  • PDF

Flexible Mold Production Process for Using the PCM (PCM을 활용한 가변형 몰드 제작 프로세스)

  • Kim, Taekoo;Lee, Donghoon;Kim, Sunkuk
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2014.05a
    • /
    • pp.272-273
    • /
    • 2014
  • Existing the free-form concrete segments (FCS) mold is produced by state of solid such as steel, wood, Styrofoam that can not be recycled. Using FCS mold result in delay on schedule and decrease of productivity because it consists of irregular curved variety and it requires more time than fixed mold. Thus, FCS mold should be developed which can reduce the costs and also it can be used as semipermanent. The aim of this study is to suggest of flexible mold production process for using the phase change materials(PCM). PCM is maintain that its solid state at low temperature but it changes phase to liquid state by heating. PCM is suitable material for flexible mold due to change of phase in relatively high temperature compare to other phase change materials such as water. Flexible mold is possible that reuse semi-permanently made by PCM. Thus, this study is proposed the process of flexible mold production for using the PCM. The study results will be used as the basic theory for studies on production and installation of FCS.

  • PDF

A Two-Stage Heuristic for Disassembly Scheduling with Capacity Constraints

  • Jeon Hyong-Bae;Kim Jun-Gyu;Kim Hwa-Joong;Lee Dong-Ho
    • Management Science and Financial Engineering
    • /
    • v.12 no.1
    • /
    • pp.95-112
    • /
    • 2006
  • Disassembly scheduling is the problem of determining the quantity and timing of disassembling used or end-of-life products while satisfying the demand of their parts and/or components over a planning horizon. The case of assembly product structure is considered while the resource capacity constraints are explicitly considered. A cost-based objective is considered that minimizes the sum of disassembly operation and inventory holding costs. The problem is formulated as an integer programming model, and a two-stage heuristic with construction and improvement algorithms is suggested in this paper. To test the performance of the heuristic, computational experiments are done on randomly generated problems, and the results show that the heuristic gives near optimal solutions within a very short amount of computation time.

The Comparison and Analysis of Occupatioanl Low Back Pains(LBPs) in Korea and Outside the Country (국내.외 직업성요통의 현황비교 및 분석)

  • 정화식
    • Proceedings of the ESK Conference
    • /
    • 1997.10a
    • /
    • pp.160-167
    • /
    • 1997
  • The statistics of work related Low Back Pains(LBPs) in Korea and outside the countires have erviewed. Despite improved working enviroment with increased automation in industry, the LBPs hve been gradually increased and the workers compensation of such injuries has increased drama- tically. An epidemiological study indicated tha tthe LBPs is te major cause of injury, lost time and medical costs in many industrial workplace especially, a high occurrence rate of LBPs among construction and manufacturing workers. The objective of this study is to investigate problems involved with LBPs in Korea and outside the country for identifying its possible causal factors and characteristics. This study will thus contribute as a basic reference to the industries and ergonomic practitioners for preventing and managing LBPs.

  • PDF

Determination of Quality Cost Policy under the Multiple Assignable Causes (다중이상원인하의 경제적 품질비용 정책결정)

  • Kim Kyewan;Park Ji Yeon;Yun Deok Kyun
    • Proceedings of the Society of Korea Industrial and System Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.1-8
    • /
    • 2002
  • At present, company has to produce a product that consumer like with a competitive price, a good quality, and a fitting time to supply. Process control and qualify control are very important to supply with a product uniformly and inexpensively In this paper, the characteristic of product quality is monitored by control chart during the machining process and construction of quality control cycle is considered to divide into two types in this case that different assignable causes lead to shifts having different magnitudes. Then we are intended to find a process shift magnitude which has economical quality cost policy and are considered to quality cost functions to find a process shift magnitude. Those costs are categorized into the well-known categories of prevention, appraisal, and internal failure and external failure. This paper ends with numerical examples that demonstrate the usefulness of the model.

  • PDF

The Use of a GPS in Geographic Information System Construction

  • Rong Lin;Chen, Yen-Wei;Ken Teruya;Ikuo Nakamura;Hiroki Higa;Zensho Nakao
    • Proceedings of the IEEK Conference
    • /
    • 2000.07b
    • /
    • pp.986-989
    • /
    • 2000
  • The traditional method to construct Geographic Information System (GIS) is to scan the published maps, then the important and difficult step is to digitize the maps data. It costs a lot of time and human resource. Because a Global Positioning System (GPS) can offer high accurate digital signal directly, we developed a new method that uses the GPS to construct the GIS.

  • PDF

Abrasion-Resistant Road Markings for Improved Durability Lane to Wear Simulators Test (차선재료의 내구성 향상을 위한 내마모성 시험 적용 연구)

  • Lee, Chang-Geun;Park, Jin-Hwan;Oh, Heung-Un
    • International Journal of Highway Engineering
    • /
    • v.13 no.3
    • /
    • pp.75-82
    • /
    • 2011
  • There is the uncertain period of the construction in case of the products meeting the quality standard of KS M 6080, the quality is degraded because of the abrasive loss of the paint caused by vehicle tires as the traffic amount increases and of the loss and detachment of the glass beads providing the retroreflective function. The abrupt degradation of visibility causes the high frequency of traffic accidents at night and increases the traffic accident rate. Additional supplementary construction induces the direct material and construction costs. As the more cost induction effect than the direct cost, the traffic jam caused by the additional construction increases the indirect social costs such as time cost and vehicle cost. Hence, the study is concerned with performing the abrasion resistance test based on the EN 1436 standard to check and improve the quality of various road marking materials resulting in improving the durability of road marking materials. However, even though the difference in the durability lifetime of resins(binders) is bibliographically or theoretically clear, there was no difference in the durability lifetime (retroreflectivity aspect) of the road marking paint using these binders. The reason is that the bonding of beads was very insufficient or that the cross density caused by crack or freshness was low. Moreover, the measured wet retroreflectivity was distributed as the Rw3 or higher class in average on the basis of EN 1436 but was very insufficient on the basis of the minimum wet threshold retroreflectivity with 100mcd/($m^2{\cdot}lx$) managed overseas.