• Title/Summary/Keyword: API Standard

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Buckling of aboveground oil storage tanks under internal pressure

  • Yoshida, Shoichi
    • Steel and Composite Structures
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    • v.1 no.1
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    • pp.131-144
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    • 2001
  • Overpressurization can occur due to the ignition of flammable vapors existing inside aboveground oil storage tanks. Such accidents could happen more frequently than other types of accident. In the tank design, when the internal pressure increases, the sidewall-to-roof joint is expected to fail before failure occurs in the sidewall-to-bottom joint. This design concept is the socalled "frangible roof joint" introduced in API Standard 650. The major failure mode is bifurcation buckling in this case. This paper presents the bifurcation buckling pressures in both joints under internal pressure. Elastic and elastic-plastic axisymmetric shell finite element analysis was performed involving large deformation in the prebuckling state. Results show that API Standard 650 does not evaluate the frangible roof joint design conservatively in small diameter tanks.

Development of Speed Increaser for High Speed Machine Pump which Considered the Noise/Vibration (소음/진동을 고려한 고속머신 펌프용 증속기 개발)

  • 이동환;박노길;김병옥;이형우
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.5
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    • pp.363-369
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    • 2004
  • Vibration/noise analysis as well as strength of gear teeth, roller bearing life. joural bearing design are considered in order to develop the high-speed machine centrifugal pump which had a speed increaser. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors and the transmitted errors of the gearing are considered. shows that. at the operating speed. there are not the critical speed. A high-speed machine centrifugal pump was made in order to evaluate developed speed increaser. Also, strict API standard were introduced for reliability evaluation of developed speed increaser, and performance evaluation were carried out. The result that evaluation items about bearing vibration, shaft vibration, noise, and lubrication temperature were selected, and were tested. a high-speed machine centrifugal pump were able to know what were satisfied with API standard all.

A Study of Korea Conformance Testing Technique for BioAPI Standard (국내 BioAPI 표준 적합성 시험기술 연구)

  • 박준우;김재성
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • pp.621-624
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    • 2002
  • 최근 급속도로 발전하고 있는 생체인식 분야는 상업적인 활성화와 이에 따른 사용자의 신뢰성 확보를 위해 서로 다른 생체인식 제품들의 상호호환성과 상호연동성을 고려한 표준화된 생체인식 데이터 및 API에 대한 기술 개발을 하고 있으며, 이러한 생체 인식 기술의 표준화는 제품들의 호환성 측면에서 매우 중요하므로 생체 정보를 이용하는 모든 제품에 대하여 시스템과 소프트웨어에 대한 표준적합성 시험이 요구될 것이다. 이에 따라 본 연구에서는 생체인식시스템 응용 인터페이스 표준 규격인 BioAPI에 대하여 표준 적합성 시험도구를 개발하기 위하여 우선적으로 BioAPI 표준규격에서 명시하는 필수함수에 대한 표준적합성시험을 수행하였다.

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A Study about Way to Decide on Residual Unbalance of Rotor-Bearing system (로터-베어링 시스템의 잔류불평형량을 결정하는 방법에 대한 연구)

  • 이형우;이동환;박노길;김인환
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.9
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    • pp.158-166
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    • 2004
  • A new method to measure residual unbalance of rotor - bearing system was proposed. The method which determine residual unbalance based on polar plot and an analytical method which calculates the residual unbalance of the rotor from the vibration response of the Jeffcott rotor are proposed in this study with respect to a real rotor system of which the residual unbalance is unknown. The unbalance eccentricity of the produced experimental model is 3.78 mil, developing the measurement method of the residual unbalance more convenient than the proposed method of ISO and API standard. The proposed method was experimentally compared with the ISO standard, and the two methods were exactly correspondent to each other within an error of 1%.

Implementation of OpenVG on Embedded Systems (임베디드 시스템을 위한 OpenVG 구현)

  • Lee, Hwan-Yong;Baek, Nak-Hoon
    • Journal of Korea Multimedia Society
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    • v.12 no.3
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    • pp.335-344
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    • 2009
  • Embedded systems and web browsers have started to provide two-dimensional vector graphics features, to finally support scalability of graphics outputs, while traditional graphics systems have focused on the raster and bitmap operations. Nowadays, SVG and Flash are actively used while OpenVG from Khronos group plays the role of a de facto low-level API standard to support them. In this paper, we represent the design and implementation process and the final results of an OpenVG implementation, AlexVG. From its design stage, our implementation aims at the cooperation with SVG-Tiny, another de facto standard for embedded systems. Currently, our overall system provides not only the OpenVG core features but also variety of OpenVG application programs and SVG-Tiny media file playing capabilities. For the conformance with the standard specifications, our system completely passed the whole OpenVG conformance test suites and the graphics output portions of the SVG-Tiny conformance test suites. From the performance point of view, we focused on the efficiency and effectiveness especially on the mobile phones and embedded devices with limited resources. As the result, it showed impressive benchmarks on the small-scale CPU's such as ARM's, even without neither any other libraries nor acceleration hardware.

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Application Methodology of XML Test Assertion for BioAPI Standard Conformance Tests in Distributed Environment (분산 환경에서의 생체인증 API 표준 적합성을 위한 XML Test Assertion 적용 방안)

  • Son, Min-Woo;Kim, Yong-Chai;Shin, Dong-Il;Shin, Dong-Kyoo;Sin, Yong-Nyeo;Kim, Jae-Seong
    • 한국IT서비스학회:학술대회논문집
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    • pp.562-567
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    • 2007
  • 분산 환경에서 신분 확인을 위한 생체인증기기가 이용되는 경우 그 기기가 생체인증 표준인 BioAPI를 준용하여 제대로 구현된 것인가에 대한 적합성 시험이 필요하게 된다. 이러한 적합성 시험은 분산 환경의 사용자 및 서비스 제공자에게 표준 규격을 준용한 제품이라는 신뢰성을 주게 된다. 기존에 제공되는 있는 BioAPI(Biometric Application Programming Interface) v2.0 기반의 BSP(Biometric Service Provider)는 오프라인 상에서 BioAPI기반의 제품의 준용 여부만을 평가하기 때문에 분산 환경에서 여러 사람이 동시에 준용 여부를 평가 받기 힘들며 이에 따른 동시 서비스 제공도 불가능하다. 본 논문에서는 BioAPI v2.0 기반의 제품들이 분산 환경에서 제공되는 9개 모델의 표준화된 환경으로 구분하고, 원활한 적합성 시험을 위하여 XML기반의 Test Assertion을 설계하여 생체인증 API 표준 적합성을 시험하였다. XML Test Assertion을 이용한 생체인증 적합성 시험을 위한 메시지 플로우를 밝혀 그 타당성을 입증하였다.

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Balancing Technic Based on Rotor Dynamics Analysis of Test Rig (Test Rig 동특성 분석에 따른 밸런싱 기술 적용)

  • Hwang, Dukyoung;Jung, Chonwoo;Park, Insun;Shin, Dongmin;Song, Jinseok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.27 no.2
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    • pp.204-212
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    • 2017
  • The rotor dynamics and balancing technic for rotating equipment during engineering and manufacture stage are to be carefully considered in order to minimize the operation troubles regarding vibration during commissioning stage. In this paper, the test rig, which includes the disks as balancing plane, is designed and manufactured, so that the characteristic of rotor dynamics can be analyzed such as critical speed and mode shape. The critical speed predicted through natural frequency analysis is verified by the actual measurement on bearing housing vibration during start-up condition of test rig. The low speed balancing and the operating speed balancing test are performed respectively with consideration of first critical speed, and the residual unbalance amounts are estimated in accordance with the relevant method described in API standard. In addition, the single and dual plane balancing are carried out on main disk and trim disk depended on phase information at each balancing step.

Unbalance Response Analysis of Copper Die Casting High Speed Induction Motor (동 다이캐스팅 고속 유도전동기의 불평형 응답 해석)

  • Hong, Do-Kwan;Jung, Seung-Wook;Woo, Byung-Chul;Koo, Dae-Hyun;Ahn, Chan-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.7
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    • pp.642-649
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    • 2012
  • This paper deals with a copper die casting induction motor which has several advantages of motor performance. The developed motor is used as spindle motor in machining center. The dynamic characteristic analysis of rotor is dealt with for precision machining. The critical speed of rotor considering rotation and gyroscopic effect should be above operating speed, 18,000 rpm, and have a 201 % sufficient separation margin. Also, the 3-D unbalance vibration response analysis is performed and enabled the prediction of the expected vibration amplitude by unbalance in high speed. The unbalance vibration responses of each position on the rotor are satisfied with allowable vibration displacement of API 611 standard according to balancing G grade(G 0.4, G 2.5, G 6.3). Copper die casting high speed induction motor is successfully developed and verified by experiment.

A Visualization Method of Spatial Information based on Web Map Service (웹 지도 기반의 공간정보 가시화 기법)

  • Kim, Min-Gyu;Lee, Moo-Hun
    • Journal of Digital Convergence
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    • v.14 no.2
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    • pp.209-216
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    • 2016
  • In these days, considering the trend to make various information blended based on spatial information like road, buildings and geography, it is to be very important to visualize maps for showing the information efficiently. However, geometry which is composed with line, polygon commonly used on web service has limitation to express information by limit of usage as well as spending certain time to show the information via map. That's why this study develops the efficient way to visualize huge and complex spatial information. This way is to bring partial space with spatial query, and then query and expand information excluded the former area after detecting movement event based on client. When the way is implemented, it will be expected to make efficient visualization in entire system by not bringing unnecessary information but shortening spending time to show area because it just shows areas which clients want to see.

Malicious Codes Re-grouping Methods using Fuzzy Clustering based on Native API Frequency (Native API 빈도 기반의 퍼지 군집화를 이용한 악성코드 재그룹화 기법연구)

  • Kwon, O-Chul;Bae, Seong-Jae;Cho, Jae-Ik;Moon, Jung-Sub
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.18 no.6A
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    • pp.115-127
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    • 2008
  • The Native API is a system call which can only be accessed with the authentication of the administrator. It can be used to detect a variety of malicious codes which can only be executed with the administrator's authority. Therefore, much research is being done on detection methods using the characteristics of the Native API. Most of these researches are being done by using supervised learning methods of machine learning. However, the classification standards of Anti-Virus companies do not reflect the characteristics of the Native API. As a result the population data used in the supervised learning methods are not accurate. Therefore, more research is needed on the topic of classification standards using the Native API for detection. This paper proposes a method for re-grouping malicious codes using fuzzy clustering methods with the Native API standard. The accuracy of the proposed re-grouping method uses machine learning to compare detection rates with previous classifying methods for evaluation.