• Title/Summary/Keyword: Analyzing Performance of Data

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The Current Status and Problems of Open Government Data on the Construction Sector and Its Improvement Plan (건설산업 공공데이터 개방의 현황과 과제)

  • Kim, Sung-Hwan;Choi, Seok-In;Yoo, Wi-Sung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.11a
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    • pp.219-220
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    • 2022
  • In order to meet the trend, construction public data are already disclosing not only data generated at the construction site but also various data ranging from inspection reports and public construction contracts through multiple portals. However, unlike the excellence of the open performance evaluated by the number of data, it is difficult to evaluate the specific level of disclosure because there is no case of analyzing the quality, ease of use, and possibility of further opening of the public construction data set. On the other hand, performance measurement is already performed using an internationally agreed evaluation method in different fields such as real estate, population, and environment. So it is essential to analyze the current status of public data openings in the construction field and to derive improvement tasks. Therefore, this study conducted a survey of researchers with the highest system utilization targeting representative public data open systems in the construction field, such as E-AIS(세움터) and KISCON. To ensure fairness and increase comparability, the questionnaire was composed using evaluation items on implementing public data conducted annually by the World Wide Web Foundation, an international non-profit organization. With these responses, we investigated the status of public data disclosure and opinions on data quality and derived tasks to improve public data disclosure in construction through the analysis of the results.

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A Development of LDA Topic Association Systems Based on Spark-Hadoop Framework

  • Park, Kiejin;Peng, Limei
    • Journal of Information Processing Systems
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    • v.14 no.1
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    • pp.140-149
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    • 2018
  • Social data such as users' comments are unstructured in nature and up-to-date technologies for analyzing such data are constrained by the available storage space and processing time when fast storing and processing is required. On the other hand, it is even difficult in using a huge amount of dynamically generated social data to analyze the user features in a high speed. To solve this problem, we design and implement a topic association analysis system based on the latent Dirichlet allocation (LDA) model. The LDA does not require the training process and thus can analyze the social users' hourly interests on different topics in an easy way. The proposed system is constructed based on the Spark framework that is located on top of Hadoop cluster. It is advantageous of high-speed processing owing to that minimized access to hard disk is required and all the intermediately generated data are processed in the main memory. In the performance evaluation, it requires about 5 hours to analyze the topics for about 1 TB test social data (SNS comments). Moreover, through analyzing the association among topics, we can track the hourly change of social users' interests on different topics.

Analysis and Evaluation of 3kW Grid-Connected PV System by Field Demonstration Test (3kW급 계통연계형 태양광발전시스템의 실증시험 분석평가)

  • So, Jeong-Hoon;Yu, Gwon-Jong;Jung, Myung-Woong;Jung, Young-Seok;Choi, Ju-Yeop
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1353-1355
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    • 2003
  • Total six units of 3kW photovoltaic (PV) system and data acquisition system (DAS) are constructed for analyzing performance of PV system at field demonstration test center of Gwang-Ju in Korea. As climatic and irradiation conditions are varied, operation characteristics of the PV system are collected and analyzed in data-acquisition system. Furthermore, not only performance test of each PV system component such as PV module and power conditioning system, but also performance of total PV system e.g. system efficiency, electric power and loss factor at the site are reviewed.

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The Development of a Computer Simulation Model for Solar Space Heating System Analysis (태양열 난방시스템 해석을 위한 전산시뮬레이션 모델의 개발)

  • Lee Y. S.;Seoh J. I.
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.16 no.1
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    • pp.63-73
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    • 1987
  • This research, through the analysis of existing programs, presents a simplified logical program which can show the thermal performance of a system, based only on hourly weather data and the system design data. This program is applicable for analyzing a system of direct heating or recirculation heating which may enhance the performance of an existing solar house. Using these system in the existing systems a little raise in performance. The model analysis of a $100\;m^2$ solar house in the seoul region shows that the following figures are the most efficient and suitable; 1. Installation an81e of collector: $45^{\circ}$ 2. Collector size: $34.56\;m^2$ 3. Capacity of main storage tank: $25\;m^3$

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The Field Demonstration Study of Residential 3㎾ PV System (3㎾ 태양광발전시스템 실증연구 I)

  • 김형석;박정국;임홍우;조금배;백형래;최창주
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2003.11a
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    • pp.365-367
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    • 2003
  • Total six units of 3㎾ photovoltaic system and data acquisition system (DAS) are constructed for analyzing performance of PV system at field demonstration test center of Gwang-Ju in Korea. As climatic and irradiation conditions are varied. operation characteristics of the PV system are collected and analyzed in data-acquisition system furthermore, not only performance test of each PV system component such as PV module and power conditioning system but also performance of total PV system e.g. system efficiency power and loss factor at the site are reviewed.

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Development of the Computer Program for Predicting the Aero-acoustic Performance in the Design Process of Axial Flow Fan (축류형 송풍기 설계 과정에서 공력-음향학적 성능 예측을 위한 전산 프로그램의 개발)

  • Chung, Dong-Kyu;Hong, Soon-Seong;Lee, Chan
    • 유체기계공업학회:학술대회논문집
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    • 2000.12a
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    • pp.91-98
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    • 2000
  • Developed is a computer program for the prediction of the aero-acoustic performance characteristics such as discharge pressure, efficiency, power and noise level in the basic design step of axial flow fan. The flow field and the aerodynamic performance of fan are analyzed by using the streamline curvature computing scheme with total pressure loss and flow deviation models. Fan noise is assumed to be generated due to the pressure fluctuations induced by wake vortices of fan blades and to radiate via dipole distribution. The vortex-induced fluctuating pressure on blade surface is calculated by combining thin airfoil theory and the predicted flow field data. The predicted aerodynamic performances, sound pressure level and noise directivity patterns of fan by the present computer program are favorably compared with the test data of actual fan. Furthermore, the present computer program is shown to be very useful in optimizing design variables of fan with high efficiency and low noise level and in analyzing their design sensitivities.

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A Study on Advanced Analysis of Construction Project Performance Evaluation (건설사업 수행성과평가에 대한 분석 고도화 연구)

  • Kim, Kyong hoon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.329-330
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    • 2023
  • The performance of the construction project is to be evaluated within 60 days of completion, according to relevant laws. It evaluates cost, construction period, design change, re-construction, safety, etc. for each project stage. And the project owners are inputting the evaluation results of the construction work into the construction project information system(CALS). The post-evaluation result information entered in this way can be referred to in the basic design of the construction project by referring to the related contents if there is a similar construction in the future. And It can also be used to predict and respond to the required period and cost by analyzing the accumulated data. In this study, in order to provide reference data that can be used in similar projects in the future, the latest analysis methods are reviewed and the possibility of future application is considered. Accordingly, this study intends to focus on the construction cost part among the indicators such as construction cost, construction period, design change, and re-construction that are currently being dealt with in post evaluation.

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Analysis of 3D Volumetric Error for Machine Tool using Ball Bar (볼바를 이용한 공작기계의 3차원 공간오차 해석)

  • Lee, Ho-Young;Choi, Hyun-Jin;Son, Jae-Hwan;Lee, Dal-Sik
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.5
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    • pp.1-6
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    • 2011
  • Machine tool errors have to be characterized and predicted to improve machine tool accuracy. Therefore, it is very important to assess errors in machine tools. Volumetric error analysis has been developed by many researchers. This paper presents a useful technique for analyzing the volumetric errors in machine tools using the ball bar. The volumetric error model is proposed in specific vertical machining center and the program is developed for generating NC code, acquiring the ball bar data, and analyzing the volumetric errors. The developed system assesses the volumetric errors such as positional, straightness, squareness, and back lash. Also this system analyzes the dynamic performance such as servo gain mismatch. The radial data acquired by ball bar on 3D space is used for analyzing these errors. It is convenient to test the volumetric errors on 3D space because all errors are calculated at once. The developed system has been tested using an actual vertical machining center.

A Comparative Study of Assessing Average Bioequivalence in $2{\times}2$ Crossover Design with Missing Observations

  • Park, Sang-Gue;Choi, Ji-Yun
    • Journal of the Korean Data and Information Science Society
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    • v.17 no.1
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    • pp.245-257
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    • 2006
  • A modified Anderson and Hauck(1983) test for analyzing a two-sequence two-period crossover design in bioequivalence trials is proposed when some observations at the second period are missing. It is based on the maximum likelihood estimators of average bioequivalence model and designed for handling missing at random(MAR) situation. The performance of the proposed test is compared to other tests using Monte Carlo simulations.

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A Reviews on the Performance Evaluation Based on Network Analysis and Super-Efficiency Analysis (연결망분석과 초효율성분석의 결합을 통한 효율성 순위 측정에 관한 고찰)

  • Choi, Kyoung-Ho;Kwag, Hee-Jong
    • Journal of Digital Convergence
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    • v.11 no.10
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    • pp.255-262
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    • 2013
  • Data envelopment analysis(DEA) is a linear programming procedure designed to evaluate the relative efficiency of a set of peer entities called decision making units which use the same inputs to produce the same outputs. It has been widely employed in a variety of disciplines as an efficiency or performance measurement tool for comparing a set of entities such as firms, banks, hospitals, nations and organizations. The method, however, cant's make the priority of their performance when many units have efficiency score of unity or 100 percent. In this paper, we propose a new approach which combine qualitative method(graphical approach using network analysis) and quantitative method(super-efficient analysis using DEA), and present the results of an empirical analysis using the data of the Korean professional baseball players. As a result, there were 12 DMU that priority is hardly realized through DEA. However, this problem could be solved with super-efficiency analyzing. Also, more in-depth interpretation was able through integrating results of dendrogram and super-efficiency analyzing and prospecting it in qualitative, quantitative ways.