• Title/Summary/Keyword: Time progress

Search Result 2,165, Processing Time 0.033 seconds

A Study on the Progress Measurement Method using Percent Complete of Work and Labor Productivity - Focusing on Structural Works of Apartment Construction - (단위작업 물량 달성율과 투입 노무량을 이용한 진도율 산정방법에 관한 연구 - 공동주택공사의 골조공사를 중심으로 -)

  • Choi Hyun-Ha;Lee Junbok
    • Korean Journal of Construction Engineering and Management
    • /
    • v.6 no.1 s.23
    • /
    • pp.212-219
    • /
    • 2005
  • Time management is important in construction management Especially, in the high-rise apartment housing projects, it is very important to expedite the construction progress in order to meet the planned schedule. The objective of this paper is to propose the baseline for the progress rate using work volume and man $\cdot$ hours performed at work activity level. The work volume far each activity is transformed to the weighted value compared to total work volume for the floor Therefore, a progress rate for an activity is calculated by multiplying a weighted value and work volume. A progress rate for a floor and a building can calculated in this manner, respectively.

Effects of Gentiana marcrophylla on Immune Response in the Collagen induced Arthritis (진구가 Collagen유발(誘發) 관절염(關節炎)의 면역반응(免疫反應)에 미치는 영향(影響))

  • Kim, Seong-Jae;Lee, Eon-Jeong;Kim, Hyeong-Kyun;Song, Bong-Keun
    • The Journal of Korean Medicine
    • /
    • v.19 no.1
    • /
    • pp.368-384
    • /
    • 1998
  • To know the effects of Gentiana macrophylla(GM) on the immune response, this study was undertaken. GM is one of the well-known oriental medicines for a lomg time used for the treatment of such diseases as arthralgia, headache, hepatitis, SLE, hemiparesis, and so on. To evaluate the effects of GM on immune response in the collagen induced arthritis, phagocytic activity of macrophages, proliferation of T-lymphocytes, secretion of nitric oxide in urine, and production of ROIs, $TNF-{\alpha}$ and nitric oxide in synoviocytes were measured. The results obtained in this study were as follows: 1. During the progress of CIA, the administration of GM enhanced phagocytic activity of macrophages in vivo and vitro. 2. During the progress of CIA, the administration of GM inhibited production of ROIs in synoviocytes. 3. During the progress of CIA, the administration of GM inhibited production of TNF- a in synoviocytes. 4. During the progress of CIA, the administration of GM inhibited proliferation of T lymphocytes. 5. During the progress of CIA, the administration of GM inhibited production of nitric oxide in synoviocytes. 6. During the progress of CIA, the administration of GM inhibited secretion of nitric oxide in urine. According to the above results, during the progress of CIA, it might be considered that GM has a curative effect on rheumatoid arthritis by controling immune response.

  • PDF

Multivariate SPC Charts for On-line Monitoring the Batch Processes (배치 공정의 온라인 모니터링을 위한 다변량 관리도)

  • Lee Bae Jin;Kang Chang Wook
    • Proceedings of the Society of Korea Industrial and System Engineering Conference
    • /
    • 2002.05a
    • /
    • pp.387-396
    • /
    • 2002
  • Batch processes are a significant class of processes in the process industry and play an important role in the production of high quality speciality materials. Examples include the production of semiconductors, chemicals, pharmaceuticals, and biochemicals. With on-line sensors connected to most batch processes, massive amounts of data are being collected routinely during the batch on easily measured process variables such as temperatures, pressures, and flowrates. In this paper, multivariate SPC charts for on-line monitoring of the progress of new batches are developed which utilize the information in the on-line measurements in real-time. We propose the formation of statistical model which describes the normal operation of a batch at each time interval during the batch operation. An on-line monitoring scheme based on the proposed method can handle both cross-correlation among process variables at any one time and auto-correlation over time. And the control limits for the monitoring charts are established from sound statistical framework unlike previous researches which use the external reference distribution. The proposed charts perform real-time, on-line monitoring to ensure that the batch is progressing in a manner that will lead to a high-quality product or to detect and indicate faults that can be corrected prior to completion of the batch. This approach is capable of tracking the progress of new batch runs, identifying the time periods in which the fault occurred and detecting underlying cause.

  • PDF

Optical Scanning Holography - A Review of Recent Progress

  • Poon, Ting-Chung
    • Journal of the Optical Society of Korea
    • /
    • v.13 no.4
    • /
    • pp.406-415
    • /
    • 2009
  • Optical scanning holography (OSH) is a distinct digital holographic technique in that real-time holographic recording a three-dimensional (3-D) object can be acquired by using two-dimensional active optical heterodyne scanning. Applications of the technique so far have included optical scanning cryptography, optical scanning microscopy, 3-D pattern recognition, 3-D holographic TV, and 3-D optical remote sensing. This paper reviews some of the recent progress in OSH. Some possible further works are also discussed.

Recent Progress in Natural Three-Dimensional Display

  • Takaki, Yasuhiro
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.505-508
    • /
    • 2009
  • The super multi-view (SMV) display and the high-density directional (HDD) display were proposed as a natural 3D display that is free from the visual fatigue caused by the accommodation-vergence conflict and provides smooth motion parallax. The multi-projection system, the flat-panel system, and the time-multiplexing system are used to construct the HDD displays. The recent progress of the HDD 3D display is reviewed.

  • PDF

Liquidity and Mechanical Properties of Concrete by Fluidity Retention Agent Mix Rate Change (유지제 혼입율 변화에 따른 콘크리트의 유동성 및 역학적 특성)

  • Park, Byung-Kwan;Choi, Sung-Yong;Pei, Chang-Chun;No, Dong-Hyun;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2008.11a
    • /
    • pp.89-92
    • /
    • 2008
  • This research analyzed the basic characteristics of unhardened concrete and the compression strength characteristics of hardened concrete according to liquidity retention agent mix rate change to improve the liquidity fluidity retention performance of high performance concrete, and produced the following results. The moment fluidity retention agent is added according to fluidity retention agent mix rate change, which increased fluidity retention agent mix rate, slump flow decreased, and in the case of slump flow according to the progress time change by the fluidity retention agent mix rates, the more fluidity retention agent mix rate increased, the lower slump flow change rate became. The moment fluidity retention agent is added according to fluidity retention agent mix rate change, fluidity retention agent mix rate increased compared to non-mixture of fluidity retention agent, and the air amount by progress time change by the fluidity retention agent mix rates slightly increased, however target range is still met and unit volume mass is inversely proportional to air amount. Compression strength according to age progress by the fluidity retention agent mix rates was shown to increase slightly with increase in fluidity retention agent mix rate, and yet the difference was not significant.

  • PDF

A Study on the Welding Conditions of Weldability of Team Welding for Galvanized Steel Sheets of Automotive (자동차용 아연도금강판의 심 용접조건과 용접성에 관한 연구)

  • 임재규;정균호;국중하
    • Journal of Welding and Joining
    • /
    • v.19 no.1
    • /
    • pp.27-32
    • /
    • 2001
  • This paper is studied about welding conditions and weldability of seam welding for galvanized steel sheet of automotive. The fuel tank of automobile is made by seam welding to be required of airtight or oiltight. This method have required a short time for welding, simplicity operation progress and little HAZ. Especially, it has more less residual stress and transformation than different welding progress. So, this study is for decreasing the leakage occurrence rate and to make standard operating condition table anyone can operate easily. Therefore, this study is analyzed the optimum conditions of seam welding for making the automobile with galvanized steel sheets by means of observing the microstructure and configuration back projection, RT, tensile-shear strengths test and SEM. Optimum conditions of seam welding obtained as follows, current 17.2-17.6kA speed 1.0m/min weld time 4:10:6 and current 16.5-17.4kA, speed 0.83m/min, weld time 4:10:4 at t1.0, and current, 18.5-18.9kA, speed 0.8m/min, weld time 4:10:4 and current 16.5-17.4kA, speed 0.68m/mi, weld time 4:10:2 at t1.6.

  • PDF

Forced Vibration Analysis and Response Characteristics of a Vehicle Dull Progress Model (차량의 둔턱 진행 모델 강제진동해석과 응답특성)

  • Lee, Hyuk;Yoon, Moon-chul;Kim, Jong-Do
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.19 no.11
    • /
    • pp.49-57
    • /
    • 2020
  • The forced vibration characteristics for two impulse forces with time lag was discussed in the vehicle dull progress model. Detailed numerical analyses of the time domain were performed systematically. By the two exciting impulse forces, the responses of displacement, the velocity, and the acceleration were investigated in detail for the vehicle's vibration. Notably, the forced vibration responses in the time domain can be used to identify and monitor several vehicle vibration models. In order to define the responses of displacement, the velocity, and the acceleration, we applied a numerical technique (i.e., the Runge-Kutta-Gill method[1,2]). These variables were subsequently used to analyze the vehicle's vibration according to the time lapse and while it passed over a bump stock; moreover, the characteristics of the variables were analyzed in detail according to their force conditions. Finally, the intrinsic characteristics of the forced vibration were discussed in the context of the automobile model. Overall, our results indicate that the tested method can be successfully applied under different damped conditions.

A Study on the International Comparison of Basic Research Capacity Index (기초연구지수의 국제비교)

  • 송충한
    • Journal of Korea Technology Innovation Society
    • /
    • v.4 no.2
    • /
    • pp.127-142
    • /
    • 2001
  • This paper presents an econometric model for measuring basic research capacity index(BRCI) of each OECD countries and analyses the gap in terms of time lag measured and forecasted in connection with factor analysis and BRCI progress function. Based on the analysis, gross domestic expenditure on R&D(GERD), total R&D personnel higher education expenditure on R&D(HERD) and number of science and technical papers based on SCI are more effective than other factors to BRCI. Also, BRCI progress function shows that 29 years is needed for Korea to catch up the level of German's BRCI of year 1998. But, it's impossible for Korea to catch up US and Japan. Therefore, with restricted scientific resources, Korea's own strategy for strengthening basic research capacity is going to be more important in 21st century.

  • PDF

A Progress-based Expert System for Quantitative Assessments of Project Delay

  • Yoo, Wi Sung
    • Architectural research
    • /
    • v.10 no.1
    • /
    • pp.41-48
    • /
    • 2008
  • Construction projects have frequently exceeded their schedule despite reliable estimates at the start of a project. This problem was attributed to unpredictable causes at the beginning and to shortage of proper tools to accurately predict project completion date. To supplement this difficulty, project managers need a comprehensive system that can be employed to monitor the progress of an ongoing project and to evaluate potential delay for achieving the goal on time. This paper proposed a progressive-based expert system for quantitative assessments of project delay at the early stages of the execution. Furthermore, the system is used to inspect the change of the uncertainty on completion date and its magnitude. The proposed expert system is helpful for furnishing project managers a warning signal as a project is going behind schedule and for tracking the changed uncertainty at a desired confidence level. The main objectives of this paper are to offer a new system to overcome the difficulties of conventional forecasting tools and to apply a construction project into the system to illustrate its effectiveness. This paper focuses on construction phase of project development and is intended for the use by project managers.