• Title/Summary/Keyword: QC criteria

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Development of Rule for Quality Checking Items to Raise Quality of BIM Model -Focusing on the Domestic BIM Guidelines- (BIM 모델의 완성도를 높이기 위한 품질검토항목의 룰 개발 - 국내 BIM 지침을 중심으로 -)

  • Song, Jong-Kwan;Ju, Ki-Beom
    • Korean Journal of Construction Engineering and Management
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    • v.14 no.5
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    • pp.131-143
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    • 2013
  • There is the difference of criteria to apply guidelines among the project participants and to depend on the purpose of utilizing BIM models, although modeling criteria are basically provided through BIM guidelines. Therefore, it is quite important to check compliance with guidelines to raise quality of the BIM model. But Quality Checking (QC) items and method for BIM model modeled in accordance with guidelines is not provided. This study suggested QC items and Rule Specifications(RS) for automatic QC. First of all, QC items were derived by analyzing domestic BIM guidelines and a process for structuring natural language is conducted by utilizing flowchart and pseudocode. So, by combining them, RS was suggested. Finally, RS-based case study was conducted by implementing automatic QC process with solibri model checker$^{TM}$. This study will contribute to the improvement of design quality and completeness of BIM model including huge data of 3 dimension. Furthermore, it is necessary to develop BIM guidelines according to the use case and to provide detailed process and standard for QC of BIM model.

A Study on the Determination of Construction Depth of Vertical Drain by Cone Resistance (콘 관입저항치를 이용한 수직배수재 타설심도 결정에 관한 연구)

  • Jang, Seo-Yong;Kim, Jong-Ryeol;Shin, Yun-Sup;Ma, Bong-Duk
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.5
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    • pp.163-170
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    • 2006
  • Recently, piezocone penetration test is frequently used in order to estimate the characteristics of soft ground with standard penetration test, generally used in the past. In this study, the correlation of standard penetration test, piezocone penetration test and driving resistance of vertical drain is analyzed in order to increase the confidence for determination of soft ground depth. As the results of each zone, the relation between standard penetration test and piezocone penetration test shows qc=(1.09~1.63)N at the soft ground, determined by 5/30 N value which is decided for soft ground criteria. And qc=(1.21~1.98)N was shown at the point of compressible layer, evaluated by the preconsolidation pressure. And driving resistance of vertical drain is $65{\sim}70kgf/cm^2$ which is equal to $10kgf/cm^2$ of cone penetration resistance.

Quality Control(QC) Analysis of Ambient VOCs in Canisters Using GC/MSD Method (Canister와 GC/MSD를 이용한 대기 중 VOCs 분석시스템의 정도관리(QC))

  • Jeon, Jun-Min;Hur, Dang;Kim, Dong-Sool
    • Journal of Korean Society for Atmospheric Environment
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    • v.18 no.6
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    • pp.527-538
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    • 2002
  • In this study, the performance of sampling and of analytical methodology was examined against a number of selected volatile organic compounds (VOCs) in the ambient air. The canister-based sampling method for VOCs has been a viable and widely used approach that is based on research and evaluation performed over the past several years. VOCs were determined using canisters by GCMSD analysis. A total of target analyses in this study included approximately 30 VOCs designated in TO-l4A categories including BTEX. The methodology for QC(quality control) was intensively investigated with a wide range of performance criteria such as; (1) cleanliness of canisters, (2) reproducibility of diluter, (3) instrumental detection limits of preconcentrator and GCMSD, and (4) precision and accuracy of GCMSD. For most of the compounds tested, precision was less than $\pm$5%, IDL was 0.2 ppbv, accuracy was $\pm$5%, respectively. This study demonstrated that the combination of canister sampling and GC/MSD analysis could be reliably applied to the measurements of BTEX in ppbv levels that are typically observed in/outdoor air environment.

The Need for QA/QC in the Measurements of Airborne Pollutants - Conduction of and Directions towards an Interlaboratory Comparison Test in 1998 by the Measurement and Analysis Division of KOSAE (대기오염측정에 대한 정도관리의 필요성 - 1998년도 한국대기환경학회 측정분석분과회의 실험실간 비교분석사업 시행과 전개방향)

  • 김기현;이강웅;김조천;서영화;이종해;허귀석
    • Journal of Korean Society for Atmospheric Environment
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    • v.15 no.1
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    • pp.63-69
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    • 1999
  • To offer a general guideline for the quantitative analysis of airborne pollutants, we designed and conducted a comprehensive QA/QC test using two different strategic approaches, namely (1) field-based comparative measurement and (2) laboratory-based comparative analysis. The former task was performed to make meaningful comparison of combined errors occurring from both sampling and analytical techniques in the measurements of such components as: (1) criteria pollutants, (2) volatile organic compounds (VOCs), and (3) particulate matters with the associated metals and ions. The latter task was also conducted to compare various types of bias arising mainly from the laboratory analytical procedures of (1) gaseous standards of VOCs and (2) of aqueous standards of metals and ions. The concentration data derived from each of these two different types of major tasks were evaluated per chemical species categorized as above. While the very details of these studies are to be reported on an individual basis according to the above classification of the project, this paper is presented to provide an overview of the whole project - its aim and direction.

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Development and Validation of Crocidolite Quality Control Samples for Proficiency Analytical Testing (청석면 분석 정도관리용 표준시료 개발 및 평가)

  • Lee, Ji-Hyun;Kim, Eun-Young;Noh, Su-Jin;Park, Yong-Jin;Jeong, Jee-Yeon
    • Journal of Environmental Health Sciences
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    • v.37 no.1
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    • pp.57-63
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    • 2011
  • Crocidolite quality control (QC) sampling created by the wet generation method has been validated by validation tests such as the accuracy, precision, and storage tests. For this study we designed and developed a manufacturing apparatus and standard operating procedure for making these QC samples. The most important step in the procedure of making QC samples was the stage eliminating static electricity in asbestos fibers. This static electricity hampers the fibers clog functioning. In accuracy and precision tests by phase contrast microscopy analysis, the difference between the reference values and the studied values was at maximum 17.8%. This satisfies the AIHA proficiency analytical test criteria for asbestos. We could confirm the nearly even distribution of crocidolite fibers on the membrane filter. Also, there was no loss of fibers in the storage test after the one month.

A Framework of Automating Inspection Task Generation for Construction Projects (건축 시공단계 검측 업무 자동 생성을 위한 프레임워크 개발)

  • Jo, Seuckyeon;Lee, Jin Gang;Choi, Jaehyun
    • Korean Journal of Construction Engineering and Management
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    • v.24 no.1
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    • pp.40-50
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    • 2023
  • Quality control (QC) is an essential work for the successful construction project execution. Recently, robust application of ICT to the QC tasks leads to utilizing innovative technologies and equipment. However, overall planing of QC works needs to take place before applying new technologies to each and individual QC task. The objectives of this research involve developing a database and an algorithm that identifies QC tasks and related information upfront. In addition, the researchers developed a methodology to generate inspection tasks in conjunction with construction work tasks. The Korean Ministry of Land and Transportation provides standard supervision checklists. They were classified based on criteria of inspection items, methods, period and the scope. Reinforced concrete work was selected as a case study for validation of the method. This framework can function when planing construction tasks with any type of planning tools and innovative technologies. The researchers expect this framework may contribute to various construction projects when developing QC plans and tasks with applicable technologies.

Development of Asbestos Quality Contral Samples for Proficiency Analytical Testing II - Evaluation of Amosite and Chrysotile Quality Contral Samples - (석면분석 정도관리용 표준시료 개발연구 II - Amosite 및 Chrysotile 표준시료 평가 -)

  • Yi, Gwang Yong;Yoon, Chung sik;Han, Jin Ku;Yun, Moonjong;Jung, Sijeong;Lee, Jong Han;Lee, In Sub;Park, Doo Yong
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.19 no.3
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    • pp.288-296
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    • 2009
  • We conducted validation for asbestos quality control (QC) samples made by the developed method which was presented in our published paper. The main results of the validation study are as follows. The pooled coefficient variations of analytical results in three different concentrations (low, medium, and high concentration) for amosite and chrysotile were less than 20 %, which met the sample homogenicity criteria of NIOSH. Also we confirmed the homogenicity of asbestos samples by using the relocatable field slide. To evaluate the field applicability of the developed asbestos QC samples, the field validation was performed with four proficient asbestos analysts by using the statistical methods of AIHA asbestos PAT program. All analytical results from four asbestos analysts were located in the acceptable range.

Quantitative Determination of Doxifluridine and 5-FU in Monkey Serum Using LC/MS/MS (LC/MS/MS를 이용한 원숭이 혈액에서의 Doxifluridine과 대사체 5-FU 동시분석법 개발 및 Validation)

  • Woo, Young-Ah;Kim, Ghee-Hwan;Kim, Won;Lee, Jong-Hwa;Jeong, Eun-Ju;Kim, Jin-Ho;Park, Kui-Lea;Kim, Choong-Yong
    • YAKHAK HOEJI
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    • v.51 no.3
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    • pp.174-178
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    • 2007
  • A reverse-phase high performance liquid chromatography method with electrospray ionization and detection by mass spectrometry is described for the simultaneous determination of doxifluridine and its active metabolite 5-flu-orouracil (5-FU) in monkey serum. The method has greater sensitivity and simpler process than previous published methods with good accuracy and precision. A proper liquid/liquid extraction was used to extract simultaneously doxifluridine and 5-FU which has considerable difference in the polarity. Extracts were analyzed using LC/MS/MS providing a short analysis time within 5 min. The lower limit of quantification was validated at 10.0 ng/ml of serum for both doxifluridine and 5-FU. Accuracy and precision of quality control (QC) samples for both analytes met FDA Guidance criteria of ±15% for average QC accuracy with coefficients of variation less than 15%. The method will be applicable for preclinical studies and bioequivalence studies.

A Study on the Effect of Perception and Practice of QC Personnel on Post-Management: Focusing on KS Certified Factory Evaluation Criteria (QC담당자의 인식 및 실행이 사후관리에 미치는 영향에 관한 연구: KS인증 공장심사 평가항목을 중심으로)

  • Taek-Yeon Yoo;Jung Eui Hong;Kwang-Soo Kim
    • Journal of the Korea Safety Management & Science
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    • v.26 no.2
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    • pp.107-115
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    • 2024
  • This study conducted frequency analysis, reliability analysis, descriptive statistics, and correlation analysis to determine the impact of quality control managers' perception and implementation of KS certification factory inspection evaluation items on follow-up management. Through a multiple linear regression model, the influence of KS certification officer's awareness and implementation of KS certification factory inspection on post management was found to have a positive (+) influence on post management, with implementation having a greater influence on post management than awareness. It was having an impact. The independent variable (perception) has a statistically significant impact on the mediating variable (execution), and in the stage of verifying the mediating effect, the influence of the independent variable (perception) on the dependent variable (follow-up management) has a statistically significant impact. , In the stage where the independent variable (perception) and the mediator (implementation) are input simultaneously, both the independent variable and the mediator have a statistically significant effect on the dependent variable, indicating that there is a mediation effect.

Field Performance Evaluation of Candidate Samplers for National Reference Method for PM2.5 (PM2.5 국가기준측정장비 선정을 위한 비교 측정 연구)

  • Lee, Yong Hwan;Park, Jin Su;Oh, Jun;Choi, Jin Soo;Kim, Hyun Jae;Ahn, Joon Young;Hong, You Deog;Hong, Ji Hyung;Han, Jin Seok;Lee, Gangwoong
    • Journal of Korean Society for Atmospheric Environment
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    • v.31 no.2
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    • pp.157-163
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    • 2015
  • To establish National Reference Method (NRM) for $PM_{2.5}$, operational performance of 5 different commercial gravimetric-based $PM_{2.5}$ measuring instruments was assessed at Bulkwang monitoring station from January 23, 2014 to February 28, 2014. First, physical properties, design, and functional performance of the instruments were assessed. Evaluation was carried out to determine whether operating method for the instruments and levels of QA/QC activities meet the data quality objectives (DQOs). To verify whether DQOs were satisfied, reproducibility of QA/QC procedures, accuracy, relative sensitivity, limit of detection, margin of error, and coefficient of determination of the instruments were also evaluated. Results of flow rate measurement of 15 candidate instruments indicated that all the instruments met performance criteria with accuracy deviation of 4.0% and reproducibility of 0.6%. Comparison of final $PM_{2.5}$ mass concentrations showed that the coefficient of determination ($R^2$) values were greater than or equal to 0.9995, and concentration gradient ranged from 0.97 to 1.03. All the instruments satisfied criteria for NRM with the estimated precision of 1.47~2.60%, accuracy of -1.90~3.00%, and absolute accuracy of 1.02~3.12%. This study found that one particular type of measuring instrument was proved to be excellent, with overall evaluation criteria satisfied.