• Title/Summary/Keyword: Development factor

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Evaluation of seismic performance factors for tension-only braced frames

  • Shariati, Mahdi;Lagzian, Majid;Maleki, Shervin;Shariati, Ali;Trung, Nguyen Thoi
    • Steel and Composite Structures
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    • v.35 no.4
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    • pp.599-609
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    • 2020
  • The tension-only braced frames (TOBFs) are widely used as a lateral force resisting system (LFRS) in low-rise steel buildings due to their simplicity and economic advantage. However, the system has poor seismic energy dissipation capacity and pinched hysteresis behavior caused by early buckling of slender bracing members. The main concern in utilizing the TOBF system is the determination of appropriate performance factors for seismic design. A formalized approach to quantify the seismic performance factor (SPF) based on determining an acceptable margin of safety against collapse is introduced by FEMA P695. The methodology is applied in this paper to assess the SPFs of the TOBF systems. For this purpose, a trial value of the R factor was first employed to design and model a set of TOBF archetype structures. Afterwards, the level of safety against collapse provided by the assumed R factor was investigated by using the non-linear analysis procedure of FEMA P695 comprising incremental dynamic analysis (IDA) under a set of prescribed ground motions. It was found that the R factor of 3.0 is appropriate for safe design of TOBFs. Also, the system overstrength factor (Ω0) was estimated as 2.0 by performing non-linear static analyses.

A Search for the Factor on Productivity Fluctuation in Korean Manufacturing Industries (우리나라 제조업의 생산성 변동원인 규명)

  • 강규철
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.22 no.51
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    • pp.175-187
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    • 1999
  • The notion of productivity has been extended from the quantitative change of input factors to the efficiency change meaning efficient use of resources, and to the technical change meaning the qualitative improvement of input resources. In this way, the technical change is termed as total factor productivity in the individual businesses or the manufacturing industries. They should efficiently respond to the variations of economic environment and at the same time, have to make the efforts to improve productivity by increasing managerial efficiency and rasing the level of technology change for the continuous growth. Considering the growing importance of productivity, this study closely examines the factors influctuation on the productivity, fluctuation using total factor productivity in korean manufacturing industries. For the objective this study investigates the methods of measurement about total factor productivity, establishes the hypotheses based on the preceding research and finding. The results are obtained through the examination on the outcoms of regression analysis and related data. The results can be summarized as follows, First, in the progress of korean industrialization, the qualitative growth does not depend on the total factor productivity of the technical advance, and does not lead to the industry expansion. That is, the contribution of total factor productivity turns out to be relatively low. Second, it is necessary for the manufacturing industry to improve the level of technology and to emphasize the innovation of business, since the capital investment does not completely become fixed in the growth rate of productivity. Finally, continuous R&D investment should be made to increase total factor productivity. Namely, the regulation of industrial structure with an intensive technical development is essential and should be based on scientific and technical knowledge.

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Analysis of Cause and Effect Structure for Nogwonsang (노권상(勞倦傷)의 인과 구조 분석)

  • Yoon, Kyu-Jin;Lee, Sang-Chul;Kim, Min-Yong;Park, Young-Bae;Park, Young-Jae
    • The Journal of the Society of Korean Medicine Diagnostics
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    • v.14 no.1
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    • pp.1-14
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    • 2010
  • Backgrounds : Bojungikgitang is one of the most common herbal prescriptions in Oriental Medicine, and it is highly recommended prescription for Nogwonsang syndrome. The Author developed Nogwonsang questionnaire for quantitative evaluation. Nogwonsang questionnaire is consisted of causes that induce fatigue, symptoms that directly associated with fatigue, and secondary symptoms that is induced from fatigue. Purposes : This study aims to verify whether the Bojungikgitang Questionnaire has causality and meaningful path structure by path analysis. Methods : 242 patients from 12 OMD clinics participated in this study. The patients executed a question investigation in the object. Factor analysis was conducted for extraction of factor and abridgment of items. Path analysis was conducted to verify path structure. SPSS 15.0 for Windows and AMOS 7.0 were used for statistical analysis. Results : Overwork factor explains fatigue factor. Coefficient is 0.771. Fatigue factor explains digesting and cold factor. Individually coefficient is 0.632 and 0.465. Model fit is $X^2=61.395$(df=51), GFI=0.960, AGFI=0.939, NFI= 0.924, CFI=0.986, RMSEA=0.029. Path structure is proved to be significant. Conclusions : Further research is needed Gold standard of Nogwonsang. Establishment of Gold standard leads and the collection of data and the research which are objective are possible. Connection of the clinical indexes which are objective on the paperweight outside and leads and the development of the diagnosis tool which is fixed quantity is demanded.

The Development of N2O Emission Factor at Killn Type Pyrolysis Melting Facility (외열킬른형 열분해용융시설의 N2O 배출계수 개발)

  • Yun, Hyun-Ki;Lee, Dae Kyeom;Cho, Changsang;Kang, Seongmin;Yoon, Young joong;Jeon, Youngjae;Jeon, Eui Chan
    • Journal of Climate Change Research
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    • v.8 no.3
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    • pp.231-237
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    • 2017
  • In this study, the $N_2O$ emission factor of the facility was developed by measuring the kiln type pyrolysis melting facility. This used PAS (Photoacoustic Spectroscopy) method and measured the $N_2O$ emission concentration. From March 2016 to April 2016, it was measured over a total of two times and $N_2O$ concentrations were measured continuously for 24 hours using a 24 hour continuous measuring instrument (LSE-4405). The measured $N_2O$ emission concentration of the pyrolysis melting facility was 0.263 ppm on average and the emission concentration distribution in the range of 0.013~0.733 ppm was obtained. Therefore, the $N_2O$ emission factor of the kiln-type pyrolysis melting facility was estimated to be $0.829gN_2O/ton$-Waste. As a result of comparing the $N_2O$ emission factor of the thermal kiln type pyrolysis melting facility and the previous study, previous studies were about 18 times higher. It is estimated that this is due to the difference of furnace temperature, oxygen concentration and denitrification facilities. It is considered that the study of the emission factor of pyrolysis melting facility is an important factor in improving the credibility of greenhouse gas inventory in waste incineration sector.

CTCF, Cohesin, and Chromatin in Human Cancer

  • Song, Sang-Hyun;Kim, Tae-You
    • Genomics & Informatics
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    • v.15 no.4
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    • pp.114-122
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    • 2017
  • It is becoming increasingly clear that eukaryotic genomes are subjected to higher-order chromatin organization by the CCCTC-binding factor/cohesin complex. Their dynamic interactions in three dimensions within the nucleus regulate gene transcription by changing the chromatin architecture. Such spatial genomic organization is functionally important for the spatial disposition of chromosomes to control cell fate during development and differentiation. Thus, the dysregulation of proper long-range chromatin interactions may influence the development of tumorigenesis and cancer progression.

THEORY AND APPLICATION OF CHROMATOGRAPHY -1. An Introduction and theory of separation of matters - (크로마토그라피의 이론(理論)과 응용(應用) - 1. 서론(序論)과 물질분리(物質分離)의 이론(理論) -)

  • Han, Song
    • Journal of Oral Medicine and Pain
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    • v.25 no.1
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    • pp.9-28
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    • 2000
  • The purpose of this article, the first part of series, is to describe the general theory applicable to various chromatographic procedures. History of chromatography, separation of matters, classification of chromatography, underlying principles of separation in chromatography, covering resolution, column efficiency, column selectivity, and capacity factor, movement of solute in chromatographic phase, including elution development, displacement development, and frontal analysis, were discussed. Mathematical description of plate theory and thermodynamic viewpoint of retention were emphasized.

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A Study on the Development of Shrink Wrapping M/C (Shrink Wrapping M/C 개발에 관한 연구)

  • 이춘만;송인성
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.458-461
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    • 2002
  • This study presents development of a machine for shrink wrapping of cans or drink bottles with thermoplastic films. The accurate position-control, the safety factor of chains, the reduction-ratio of the chain and gear, the appropriate heating temperature for banding vinyl are discussed for the optimum shrink wrapping M/C design.

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A Study on the Development of Stream Landscape Simulation System (하천 경관모의 시스템 개발에 관한 연구)

  • 김선주;박성삼
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 1998.10a
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    • pp.204-209
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    • 1998
  • The creation of favorable water space, in our living circumferential space, is a very important factor to offer rural scenery to neighbor residents. In other to arrange stream landscape, we developed Stream Landscape Simulation System(SLSS). SLSS is combined with image and database rotationally. SLSP system creates composed simulation image overlaying both background and landscape image. This system is to compare and estimate original landscape image with simulated one. SLSP system needs continuing development and buildup of Unified Relational Image Database(mm) to design of various landscape.

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The Development of the Power Controller for the Improvement of Efficiency of a Single Phase Induction Motor (단상 유도전동기의 오율적인 운전을 위한 전력 제어기의 연구개발)

  • 임달호;장석명;이규종
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.2
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    • pp.47-55
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    • 1985
  • In this paper, a multiple pulse-width modulated ac chopper mode power controller using power transistor is described. The controller is capable of handling up to 1/2 hp of power at any lagging load power factor angle and getting the optimal efficiency operating characteristics. The development, study, and experimental evaluation of the controller with induction motor load is described.

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A Study on Development of the Perceived Adequacy of Resorces Scale (자원적정지각 척도 개발에 관한 연구)

  • 조영희
    • Journal of Families and Better Life
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    • v.9 no.2
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    • pp.241-251
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    • 1991
  • The Purpose of this study was the development of scale to measure the Perceived Adequacy of Resources(PAR). A 38-item instrument was analysed with responses form 300 wives dwelling in Seoul. PAR was categorized housing, health, time money, interpersonal, knowledge/skills, community resources, Data were analysed by the method of Pearson's Correlation, Factor Analysis and Multiple Regression. Items were loaded eight resource categories such as time housing, money , health, knowledge, social support, community, psychological relationship. Internal consistency of the scale was high(Cronbach's α=.85) The result proposed PAR constructed 28 items.

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