• Title/Summary/Keyword: Check system

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Optimize Design for 5MW Offshore Wind Turbine Sub-structure Jack-up Platform (5MW급 해상풍력 Sub-structure Jack-up Platform 최적화 설계)

  • Jeon, Jung-Do;Jeon, Eon-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.6
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    • pp.115-122
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    • 2012
  • The purpose of this study is to optimize the design of the jack-up platform for 5MW offshore wind turbine system. Considering all the environmental loads such as currents, waves, winds and so on, the members of structures have been designed and optimized based on the AISC and API-RP-2A to be within the allowable stress even in the most critical and severe condition. In addition to the above strength check of structural members, the joint punching shear check and the hydrostatic collapse check are also performed where they are required for the design. The design life of the jack-up platform is 50 years for the static strength check and the fatigue design life is 100 years including to the DFF(Design Fatigue Factor) of 2.0 to have enough stability and workability for the design optimization.

CopyCheck: Korean Document Plagiarism Detection System (CopyCheck: 한글문서 표절검사 소프트웨어)

  • Park, So-Yeong;Jang, Eun-Seo;Kwon, Do-Hyung;Kang, Seung-Shik
    • Annual Conference on Human and Language Technology
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    • 2013.10a
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    • pp.129-132
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    • 2013
  • 본 논문에서는 대학의 과제물이나 학위 논문 또는 회사의 입사지원서, 자기소개서와 같은 문서에 대하여 표절검사에 활용할 수 있는 소프트웨어인 CopyCheck를 설계 및 개발하였다. CopyCheck는 표절검사 방법을 빠른 검사와 정밀 검사를 두어 보다 사용자가 편리하게 사용할 수 있도록 하였다. 표절검사를 진행한 후, 전체보기와 구간보기, 표절구간 시각화의 3가지 방법을 통해 사용자가 다양한 방법으로 표절 문서를 파악할 수 있도록 도와준다. 또한, 표절검사 결과를 저장할 수 있도록 하여 사용자가 언제든지 다시 볼 수 있도록 하였다.

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An Analytical Investigation on Fluid Dynamics of Filler Neck Check Valve for On-board Refueling Vapor Recovery (주유중 증발가스제어 필러넥 체크밸브의 유동해석)

  • 김성훈;이재천
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.10
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    • pp.105-111
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    • 2003
  • ORVR filler neck check valve, which is one of the essential components of the vapor fuel control system, should diminish the evaporation by maintaining laminar fluid flow on refueling process. This study presents numerical. results of pressure and velocity distributions of the fluid flow in a ORVR filler neck check valve on refueling process. CFD-ACE+ has been employed for numerical analysis based on the information of experimental results of valve position as a function of inlet flow rate. No abrupt pressure change, which may causes vaporization of fuel, has been confirmed to take place on the concave surface of the valve spool. However, it is clear that some possibility exist at the mid-position of surface of valve spool and downstream according to the opening of valve.

Decoding Method of LDPC Codes in IEEE 802.16e Standards for Improving the Convergence Speed (IEEE 802.16e 표준에 제시된 LDPC 부호의 수렴 속도 개선을 위한 복호 방법)

  • Jang, Min-Ho;Shin, Beom-Kyu;Park, Woo-Myoung;No, Jong-Seon;Jeon, In-San
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.12C
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    • pp.1143-1149
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    • 2006
  • In this paper, the modified iterative decoding algorithm[8] by partitioning check nodes is applied to low-density parity-check(LDPC) codes in IEEE 802.16e standards, which gives us the improvement for convergence speed of decoding. Also, the new method of check node partitioning which is suitable for decoding of the LDPC codes in IEEE 802.16e system is proposed. The improvement of convergence speed in decoding reduces the number of iterations and thus the computational complexity of the decoder. The decoding method by partitioning check nodes can be applied to the LDPC codes whose decoder cannot be implemented in the fully parallel processing as an efficient sequential processing method. The modified iterative decoding method of LDPC codes using the proposed check node partitioning method can be used to implement the practical decoder in the wireless communication systems.

A Study on development of repeat check system for product (제품 검사 시스템 개발에 관한 연구)

  • Choi, Young-Gyu
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.6 no.3
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    • pp.156-161
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    • 2013
  • Gas valve time control system used to set the time to use the gas system by one of the user's negligence explosion, fire, and to prevent accidents such as suffocation. Gas valve is one of the items is not a replacement without any special issue after installation in each customer. So sufficient test is required prior to the installation device. In this study, the test system was developed to use to set the number of times at the gas valve time control system.

Development of the Design System for the Lifting Lug Structure (탑재용 러그 구조의 설계 시스템 개발)

  • 함주혁
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2000.04a
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    • pp.189-194
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    • 2000
  • Due to the rapid growth of ship building industry and increment of ship construction in Korea, several hundred thousand of lifting lugs per year, have been installed at the lifting positions of ship block and removed after finishing their function, therefore, appropriate design system for strength check or optimal design of each lug structure has been required in order to increase the capability of efficient design. In this study, design system of D-type lifting lug structure which is most popular and useful in shipyards, was developed for the purpose of initial design of lug structure. Developed system layout and graphic user interface for this design system based on the C++ language were explained step by step. Using this design system, more efficient performance of lug structural design will be expected on the windows of personal computer.

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A Clock Monitoring Logic Suggestion at the Synchronous System (동기 시스템에서의 Clock Monitoring Logic 제안)

  • Yoon Joo-Yeong
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.6 s.336
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    • pp.17-22
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    • 2005
  • It is important that we maintain the synchronous time-information with each other in the synchronous system. The most functions in the synchronous system need the time-information. n we have the wrong time-information, the system would operate incorrectly. So, we need to check if the time-information is correct or not in the important block of the synchronous system. In this paper, we will discuss how to check the clock signal and find some problem of it. Then, we will suggest the alternative plan.

Development of a CAD/CAM System for Marine Propeller (프로펠러 가공 전용 CAD/CAM 시스템 개발)

  • Jeon, Yong-Tae;Yun, Jae-Ung;Park, Se-Hyeong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.9
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    • pp.53-61
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    • 2000
  • The manufacture of a marine propeller typically requires long lead time to generate 5-axis tool path. Hence it may take several weeks to manufacture a satisfactory propeller with a general purpose CAD/CAM system. In this research a dedicated 5-axis CAD/CAM system for machining marine propellers has been developed, The system employs various methods to enhance the productivity : interference-free tool path generation employing check vectors and optimum cutter size determinants. In addition an iterative NURBS modeling technique is used to improve the accuracy of the modeled surface and effective cutting conditions are determined and recommended empirically to increase the productivity. The proposed CAD/CAM system has been implemented with C++ and OpenGL graphic library on the Windows system. The system validation and sample results are also given and discussed.

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An availability analysis of switching control system with warm standby fault tolerant architecture (Warm standby 고장김내 구조를 지원하는 교환 제어 시스템에서의 가동률 분석)

  • 송광석;여환근;한창호;문태수;이광배;김현욱;윤충화
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.8
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    • pp.1989-2002
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    • 1996
  • In this paper, we describe several warm standby fault-tolerant models and their operation methods applicable to telephone switching control systems which have dual module structure and need high availability. Unavailabilities of the system implemented by four different methods for each model are computed by using the Markov state model, and then are compared for system performance evaluation. As the results ofsimulations, the warm standby model with triple processors is best in the aspect of data loss, while in most cases the warm standby model with doble processors based on no standby check method provides the highest system avaiability. Periodic changeover increases the system unavailability, but the preriodic standby check on standby module decreases the system unavailability of warm standby model with a single processor and with double processors. On the other hands, the variationas of warm standby model with a single processor and with double processors. On the other hand, the variations of data recovery time and personnel recovery rate have little effect on the system unavailtability.

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The Historical Study of Headache in Chinese Ming Dynasty (명대의가(明代醫家)들의 두통(頭痛)에 대한 인식변화에 관한 연구)

  • Chun, Duk-Bong;Maeng, Woong-Jae;Kim, Nam-Il
    • The Journal of Korean Medical History
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    • v.24 no.1
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    • pp.43-56
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    • 2011
  • Everyone once in a life experience headaches as symptoms are very common. According to a study in a country of more than a week and as many as those who have experienced a headache amounts to 69.4%. In addition, the high reported prevalence of migraine in 30s for 80% of all migraine sufferers daily life interfere with work or was affected. In Western medicine, the cause of headaches is traction or deformation of pain induced tissue like scalp, subcutaneous tissue, muscle, fascia, extracranial arteriovenous, nerves, periosteum. But it turns out there are not cause why pain induced tissue is being tracted or deformated. Therefore, most of the western-therapy is mainly conducted with regimen for a temporary symptom reduction. Therefore, I examined how it has been developed in Chinese Ming Dynasty, the perception of headache, change in disease stage and an etiological cause. Oriental medicine in the treatment of headache is a more fundamental way to have an excellent treatment. The recognition of head in "素問($s{\grave{u}}$ $w{\grave{e}}n$)" and "靈樞($l{\acute{i}}ng$ $sh{\bar{u}}$)" began to appear in 'Soul-神($sh{\acute{e}}n$) dwelling place' and 'where to gather all the Yang-'諸陽之會($zh{\bar{u}}$ $y{\acute{a}}ng$ $zh{\bar{i}}$ $hu{\grave{i}}$)'. Also, head was recognized as '六腑($li{\grave{u}}f{\check{u}}$) 淸陽之氣($q{\bar{i}}ng$ $y{\acute{a}}ng$ $zh{\bar{i}}$ $q{\grave{i}}$) and 五臟($w{\check{u}}$ $z{\grave{a}}ng$) 精血($j{\bar{i}}ng$ $xu{\grave{e}}$) gathering place'. More specific structures such as the brain is considered a sea of marrow(髓海-$su{\check{i}}$ $h{\check{a}}i$) in "內經($n{\grave{e}}i$ $j{\bar{i}}ng$)" and came to recognized place where a stroke occurs. Accompanying development of the recognition about head, there had been changed about the perception of headache and the recognition of the cause and mechanism of headache. And the recognition of headache began to be completed in Ming Dynasty through Jin, Yuan Dynasty. Chinese Ming Dynasty, specially 樓英($l{\acute{o}}u$ $y{\bar{i}}ng$), in "醫學綱目($y{\bar{i}}xu{\acute{e}}$ $g{\bar{a}}ngm{\grave{u}}$)", first enumerated prescription in detail by separating postpartum headache. and proposed treatment of headache especially due to postpartum sepsis(敗血-$b{\grave{a}}i$ $xu{\grave{e}}$). 許浚($x{\check{u}}$ $j{\grave{u}}n$) accepted a variety of views without impartial opinion in explaining one kind of headache in "東醫寶鑑($d{\bar{o}}ng-y{\bar{i}}$ $b{\check{a}}oji{\grave{a}}n)$" 張景岳($zh{\bar{a}}ng$ $j{\check{i}}ng$ $yu{\grave{e}}$), in "景岳全書($j{\check{i}}ng$ $yu{\grave{e}}$ $qu{\acute{a}}nsh{\bar{u}}$)", established his own unique classification system-新舊表裏($x{\bar{i}}nji{\grave{u}}$ $bi{\check{a}}ol{\check{i}}$)-, and offered a clear way even in treatment. Acupuncture treatment of headache in the choice of meridian has been developed as a single acupuncture point. Using the classification of headache to come for future generation as a way of locating acupoints were developed. Chinese Ming Dynasty, there are special treatments like 導引按蹻法($d{\check{a}}o$ y ${\check{i}}n$ ${\grave{a}}n$ $ji{\check{a}}o$ $f{\check{a}}$), 搐鼻法($ch{\grave{u}}$ $b{\acute{i}}$ $f{\check{a}})$, 吐法($t{\check{u}}$ $f{\check{a}}$), 外貼法($w{\grave{a}}i$ $ti{\bar{e}}$ $f{\check{a}}$), 熨法($y{\grave{u}}n$ $f{\check{a}}$), 點眼法($di{\check{a}}n$ $y{\check{a}}n$ $f{\check{a}}$), 熏蒸法($x{\bar{u}}nzh{\bar{e}}ng$ $f{\check{a}}$), 香氣療法($xi{\bar{a}}ngq{\grave{i}}$ $li{\acute{a}}of{\check{a}}$). Most of this therapy in the treatment of headache, it is not used here, but if you use a good fit for today's environment can make a difference.