• Title/Summary/Keyword: Performance-related Specifications

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QUALITY ASSURANCE IN ROADWAY PAVEMENT CONSTRUCTION

  • Myung Goo Jeong;Younghan Jung
    • International conference on construction engineering and project management
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    • 2013.01a
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    • pp.596-601
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    • 2013
  • In the current pavement construction practice, the state agencies traditionally determine the quality of the as-constructed pavement mix based on individual mixture material parameters (e.g., air voids, cement or asphalt content, aggregate gradation, etc.) and consider these parameters as key variables to influence payment schedule to the contractors and the present and future quality of the as-constructed mixture. A set of empirically pre-determined pay adjustment schedule for each parameter that was differently developed and being used by the individual agencies is then applied to a given project, in order to judge whether each parameter conforms to the designated specifications and consequently the contractor may either be rewarded or penalized in accordance with the payment schedule. With an improved quality assurance system, the Performance Related Specification, the individual parameters are not utilized as a direct judgment factor; rather, they become independent variables within a performance prediction function which is directly used to predict the performance. The quantified performance based on the prediction model is then applied to evaluate the pavement quality. This paper presents the brief history of the quality assurance in asphalt pavement construction including the Performance Related Specifications, statistical performance models in terms of fatigue and rutting distresses, as an example of the performance prediction models, and envisions the possibilities as to how this Performance Related Specification could be utilized in other infrastructures construction quality assurance.

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Case study of detection and maneuvering performance of naval ships using engagement simulation of engineering level

  • Jeong, Dong-Hoon;Roh, Myung-Il;Ham, Seung-Ho
    • Ocean Systems Engineering
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    • v.7 no.3
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    • pp.247-273
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    • 2017
  • Many different engagement situations require naval ships to achieve some level of effectiveness. The performance of the naval ships is very important for such effectiveness. There have been many studies that analyze the effectiveness and the performance. The former are largely related to engagement level simulations, while the latter are largely related to engineering level simulations. However, there have been few studies that consider both the engagement level and the engineering level at the same time. Therefore, this study presents three case studies using engagement simulation of the engineering level to check the performance of the related parameters. First, detection performance simulations are carried out by changing the specifications of the passive sonars of a submarine in different scenarios. Maneuvering performance simulations are carried out by changing the specification of the hydroplanes of a submarine in different scenarios. Lastly, in order to check whether or not our forces would succeed in attacking enemy forces, we perform an engagement simulation with various naval ship models that consist of several engineering level models, such as command systems, weapon systems, detection systems, and maneuver systems. As a result, the performance according to the specifications of the naval ships and weapons is evaluated.

Development of a Tractive Performance Prediction Program of Tractors (트랙터의 견인성능 예측 프로그램 개발)

  • Park, Won-Yeop;Lee, Sang-Sik
    • Journal of Biosystems Engineering
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    • v.37 no.3
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    • pp.131-139
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    • 2012
  • In this study, we developed a simulation program for the prediction of tractive performance of a tractor, by applying a widely used empirical model for tractive performance prediction of single tire, Brixius. The tractive performance prediction program can readily predict and estimate tractive performance according to various soil conditions and different specifications of tractors. The program was developed with the considerations of tractor's specification-related parameters (e.g., weight, tire size, and wheelbase of the tractor), a soil parameter (i.e., cone index which represents the soil strength), and operating conditions of the tractor (e.g., theoretical speed and driving types such as 2WD and 4WD). Also, the program was designed to provide tractive performance prediction results of tractors such as gross traction, motion resistance, net traction, and tractive efficiency, in the form of not only numerical values but also graphical visualization. To evaluate the feasibility of the program, we input three different soil conditions (which have different cone indexes each other) and tractor operating conditions to the program and analyzed the tractive performance from each input condition. From the analysis, it can be concluded that the developed program can be effectively utilized to predict the tractive performance under various soil conditions and driving types of tractors with different specifications.

A Study on the Improvement of the policies and systems related to Performance Specification (국방 성능형 규격 관련 정책제도 개선)

  • 신현인;김용진
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.2
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    • pp.97-104
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    • 2001
  • Performance specifications leave out unnesessary “how to” or detail and give the manufacturer latitude to determine how to best meet our stated needs. This will increase MND's access to commercial, state-of-the-art technology. However, we find that it is too early to expand the use of performance specification due to the poor domestic infrastructure. To expand the use of performance specification in defense area, this paper suggests the basic principles about which items we should select and which procedeure we should follow.

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A Current Collection Performance On-line Test Plan in Korea High Speed Train Development Project (고속전철 기술개발사업 본선 시운전 집전시험계획)

  • 조용현;최강윤;백광선
    • Proceedings of the KSR Conference
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    • 2001.10a
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    • pp.156-162
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    • 2001
  • Current collection performance on-line tests for a Korean High Speed Train being developed in G7 project is scheduled to start in June, 2002. In this paper, preparatory efforts for measuring contact forces which is regarded as one of major measuring items in the test are introduced. Specifically speaking, review of frequencies related with contact force fluctuations, brief of contact force measuring algorithm, review of measuring instrument specifications and development of a data acquisition program are presented.

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LCCA-embedded Monte Carlo Approach for Modeling Pay Adjustment at the State DOTs (도로공사에서 생애주기비용을 사용한 지급조정모델 개발에 관한 연구)

  • Choi Jae-ho
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.72-77
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    • 2002
  • The development of a Pay Adjustment (PA) procedure for implementing Performance-related Specifications (PRS) is known to be a difficult task faced by most State Highway Agencies (SHAs) due to the difficulty in such areas as selecting pay factor items, modeling the relationship between stochastic variability of pay factor items and pavement performance, and determining an overall lot pay adjustment. This led to the need for an effective way of developing a scientific pay adjustment procedure by incorporating Life Cycle Cost Analysis (LCCA) embedded Monte Carlo approach. In this work, we propose a prototype system to determine a PA specifically using the data in the pavement management information systems at Wisconsin Department of Transportation (WisDOT) as an exemplary to other SHAs. It is believed that the PRS methodology demonstrated in this study can be used in real projects by incorporating the more accurate and reliable performance prediction models and LCC model.

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An Exploratory Study on the Disposable Sanitary Pads for User-Oriented Product Design (사용자 중심 제품설계를 위한 일회용 생리대의 탐색적 연구)

  • Jeon, Eun-Kyung;Moon, Ji-Hyun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.34 no.1
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    • pp.167-174
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    • 2010
  • This paper aims to examine the status of sizing specifications for disposable sanitary pads on the market and to offer information on product design that reflect the requests of consumer by gathering opinion through the practical experience of consumers. Seventy-six varieties of sanitary pads on market are measured and the evaluations of wearing comfort were investigated by the questionnaire and interview for sixty three varieties of sanitary pads. As a result, they were classified into five sizes related with length but vaguely related with thickness and width. Thickness is distinguished by the compressibility that is marked as slim or ultra slim by the same brand. However, there is no sizing consistency for all products. The result shows that there is some confusion for consumers to choose desired sizes, In addition, the perception of wearing is categorized into four factors that are product performance, size and fit, wearing feeling and margin of action, and adhesive property and wrapping. The manufacturing specifications for the sanitary pads on domestic market, the requests of consumers for sanitary pad design modifications, and proposals for follow-up studies were figured out through this research.

Retrieval methodology for similar NPP LCO cases based on domain specific NLP

  • No Kyu Seong ;Jae Hee Lee ;Jong Beom Lee;Poong Hyun Seong
    • Nuclear Engineering and Technology
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    • v.55 no.2
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    • pp.421-431
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    • 2023
  • Nuclear power plants (NPPs) have technical specifications (Tech Specs) to ensure that the equipment and key operating parameters necessary for the safe operation of the power plant are maintained within limiting conditions for operation (LCO) determined by a safety analysis. The LCO of Tech Specs that identify the lowest functional capability of equipment required for safe operation for a facility must be complied for the safe operation of NPP. There have been previous studies to aid in compliance with LCO relevant to rule-based expert systems; however, there is an obvious limit to expert systems for implementing the rules for many situations related to LCO. Therefore, in this study, we present a retrieval methodology for similar LCO cases in determining whether LCO is met or not met. To reflect the natural language processing of NPP features, a domain dictionary was built, and the optimal term frequency-inverse document frequency variant was selected. The retrieval performance was improved by adding a Boolean retrieval model based on terms related to the LCO in addition to the vector space model. The developed domain dictionary and retrieval methodology are expected to be exceedingly useful in determining whether LCO is met.

Development of a Driver-Oriented Engine Control Unit (ECU)-Mapping System With BigData Analysis (빅데이터 분석을 통한 운전자 맞춤형 엔진 제어 장치 시스템의 개발)

  • Kim, Shik;Kim, Junghwan
    • IEMEK Journal of Embedded Systems and Applications
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    • v.12 no.4
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    • pp.247-258
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    • 2017
  • Since 2016 when the regulations related to vehicle structure and device modification were drastically revised, the car tuning market has been growing rapidly. Particularly, many drivers are showing interest in changing the interior and exterior according to their preference, or improving the specifications of their cars by changing the engine and powertrain, among others. Also, as the initial engine settings such as horse power and torque of the vehicle are made for stable driving of the vehicle, it is possible to change the engine performance, via Engine Control Unit (ECU) mapping, to the driver's preference. However, traditionally, ECU mapping could be only performed by professional car engineers and the settings were also decided by them. Therefore, this study proposed a system that collects data related to the driver's driving habits for a certain period and sends them to a cloud server in order to analyze them and recommend ECU mapping values. The traditional mapping method only aimed to improve the car's performance and, therefore, if the changes were not compatible with the driver's driving habits, could cause problems such as incomplete combustion or low fuel efficiency. However, the proposed system allows drivers to set legally permitted ECU mapping based on analysis of their driving habits, and, therefore, different drivers can set it differently according to the vehicle specifications and driving habits. As a result, the system can optimize the car performance by improving output, fuel efficiency, etc. within the range that is legally permitted.

Development of the Design Program of the Brake System for the Tractor-Semitrailer Vehicle (Tractor-Semitrailer 차량의 브레이크 시스템 설계 프로그램 개발)

  • 서명원;권성진;박윤기;양승환;박병철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.3
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    • pp.108-120
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    • 2001
  • In this paper, the braking performance considering the dynamic weight is analyzed about the tractor-semitrailer vehicle. The basic brake performance, the parking brake performance, the emergency brake performance and the locking point deceleration etc. are to be calculated for the brake system design of the tractor-semitrailer vehicle. This braking performance is related to traffic regulations and braking characteristics according to the vehicle deceleration, the tire-road friction coefficient and specifications of the air brake system. The design program for the braking performance based on various design variables of the vehicle and the air brake system is developed integrating the analysis functions. This design program is developed by an object oriented programming method that is windows based. GUI (Graphic User Interface) function and the convenience of operating are greatly considered.

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