• Title/Summary/Keyword: 원유 저장선

Search Result 9, Processing Time 0.026 seconds

Slow Drift Motion Analyses for a FPSO with Spread Mooring Systems (다점 계류된 원유 저장선에 대한 저주파수 운동 해석)

  • 이호영;박종환;곽영기
    • Journal of Korean Society of Coastal and Ocean Engineers
    • /
    • v.13 no.3
    • /
    • pp.195-201
    • /
    • 2001
  • The time simulation of slow drift motions of moored FPSO in waves is presented. The equation of motion based on Cummin's theory of impulse responses are employed, and are consisted of horizontal plane motions such as surge, sway and yaw. The added mass, wave damping coefficients, first order wave exciting forces and the second order wave drift forces involved in the equations are obtained from three-dimensional panel method in the frequency domain. The mooring lines are modeled as quasi-static catenary cable. As a numerical example, time domain analyses are carried out for a box-type FPSO in long crest irregular wave condition.

  • PDF

Drift Motion Analyses for a FPSO with Spread Mooring Systems (다점 계류된 원유 저장선에 대한 표류 운동 해석)

  • 이호영;임춘규;신현경
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.222-227
    • /
    • 2001
  • The time simulation of slow drift motions of moored FPSO in waves is presented. The equation of motion based on Cummin's theory of impulse responses are employed, and are consisted of horizonal plane -surge, sway and yaw. The added mass coefficients, wave damping coefficients, first order wave exciting forces and the second order wave drift forces involved in the equations are obtained from a three-dimensional panel method in the frequency domain. The mooring lines are modeled quasistatically as catenary for chains and touchdown. As for numerical example, time domain analyses are carried out for a box-type FPSO in long crest irregular wave condition.

  • PDF

A Study on the Deck Wetness of the FPSO (원유 생산.저장.하역선의 갑판침수에 관한 연구)

  • 임춘규;이호영
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.41 no.1
    • /
    • pp.8-14
    • /
    • 2004
  • As the number of offshore structure is glowing in deep waters, there have been increased damages of it. These floating structures in offshore locations exposed to harsh environmental conditions. In recent years, there has been a slowing attention around damages on bow and deck on FPSO caused by waves in steep storm condition. This paper describes a study of the water on deck due to the dynamic behavior of a FPSO with turret mooring system. The nonlinear motions of the FPSO are simulated under external forces due to wave, current, wind, and mooring forces in the time domain. The direct integration method is employed to estimate low frequency drift wave forces. The current forces are calculated by using slow motion maneuvering equations in the horizontal plane. The coefficients of a model for wind forces are calculated from Isherwood's experimental data and the variation of wind speed is estimated by wind spectrum according to the guidelines of API-RP2A.

Development of Measuring Technique for Milk Composition by Using Visible-Near Infrared Spectroscopy (가시광선-근적외선 분광법을 이용한 유성분 측정 기술 개발)

  • Choi, Chang-Hyun;Yun, Hyun-Woong;Kim, Yong-Joo
    • Food Science and Preservation
    • /
    • v.19 no.1
    • /
    • pp.95-103
    • /
    • 2012
  • The objective of this study was to develop models for the predict of the milk properties (fat, protein, SNF, lactose, MUN) of unhomogenized milk using the visible and near-infrared (NIR) spectroscopic technique. A total of 180 milk samples were collected from dairy farms. To determine optimal measurement temperature, the temperatures of the milk samples were kept at three levels ($5^{\circ}C$, $20^{\circ}C$, and $40^{\circ}C$). A spectrophotometer was used to measure the reflectance spectra of the milk samples. Multilinear-regression (MLR) models with stepwise method were developed for the selection of the optimal wavelength. The preprocessing methods were used to minimize the spectroscopic noise, and the partial-least-square (PLS) models were developed to prediction of the milk properties of the unhomogenized milk. The PLS results showed that there was a good correlation between the predicted and measured milk properties of the samples at $40^{\circ}C$ and at 400~2,500 nm. The optimal-wavelength range of fat and protein were 1,600~1,800 nm, and normalization improved the prediction performance. The SNF and lactose were optimized at 1,600~1,900 nm, and the MUN at 600~800 nm. The best preprocessing method for SNF, lactose, and MUN turned out to be smoothing, MSC, and second derivative. The Correlation coefficients between the predicted and measured fat, protein, SNF, lactose, and MUN were 0.98, 0.90, 0.82, 0.75, and 0.61, respectively. The study results indicate that the models can be used to assess milk quality.

Mooring Layout Angle and Maximum Tension for Spread Moored FPSOs in Various Metocean Conditions (다점계류식 FPSO의 해양환경별 계류선 각도와 최대 장력에 대한 연구)

  • Park, Sung-Boo;Lee, Seung-Jae;Chung, Yun-Suk;Lee, Min-Kyeong;Jung, Kwang-Hyo
    • Journal of Ocean Engineering and Technology
    • /
    • v.30 no.4
    • /
    • pp.253-259
    • /
    • 2016
  • This study demonstrates the result of mooring analysis for five spread-moored FPSOs having different length-to-breadth (L/B) ratios from 4.5–6.5. FPSOs are subjected to four metocean conditions, ones from the Gulf of Mexico (Hurricane/Loop current condition), West Africa, Nigeria, and Brazil Campos Basin, which are amongst the most typical offshore oil and gas fields. With change in design parameters of OBA (Outer bundle angle) and IBA (Inner bundle angle) combinations, a change in the line tension is demonstrated and the OBA-IBA combinations having the smallest line tension are presented for each L/B ratio and sea, respectively. This study is expected to influence the preliminary design layout of an FPSO spread-mooring system as a function of the L/B ratio and metocean conditions.

Glitch-free Pre-buffering against New Stream Request (새로운 스트림 요청에 의한 데이터 지연 문제를 피하기 위한 선행 버퍼링에 대한 연구)

  • 조경선;원유집
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2000.10c
    • /
    • pp.41-43
    • /
    • 2000
  • 멀티미디어 시스템에서는 미디어 데이터의 연속성을 보장하는 것이 중요한 문제이다. 90년대에 제안된 구역분할 디스크에서 연속성을 보장하면서 멀티미디어를 효과적으로 저장, 전송하기 위하여 새로운 스케줄링 방식과 데이터 블록의 배치가 제안되었다. 이 방식은 구역을 순환하면서 데이터 블록을 배치시키고 SCAN 알고리즘으로 데이터를 읽어 들이는 방식이다. 이 경우 SCAN 알고리즘으로 데이터를 읽어 들이므로 이중 버퍼링(double buffering) 방법을 사용하게 된다. 이중 버퍼링의 데이터를 읽어 들이는 주기와 서비스 주기의 불일치성으로 인하여 새로운 스트림의 요청이 있을 때 기존의 서비스 스트림에 주기시간의 증가로 인한 데이터의 지연문제(jitter)가 발생한다. 본 논문에서는 구역분할 디스크를 이용하는 비디오 서버에서 새로운 요구의 도착으로 인하여 발생하는 데이터 지연 문제(jitter)를 해결하기 위하여 선행 버퍼링이란 기법을 제시한다.

  • PDF

Mitigating the Side-effect of Starting New Session in Multimedia Streaming using Multi-zoned Disk (구역분할 디스크를 사용하는 멀티미디어 서버에서 새로운 세션 시작에 따른 스케줄링 지연 현상의 최소화)

  • Cho, Kyeong-Sun;Won, You-Jip;Shin, Il-Hoon;Koh, Kern
    • Journal of KIISE:Computer Systems and Theory
    • /
    • v.31 no.8
    • /
    • pp.445-452
    • /
    • 2004
  • Zoning technology of disk improved the performance of disk subsystem with increase of storage capacity and average transfer bandwidth. SCAN disk scheduling with double buffering is used to utilize the performance of zoned disk in multimedia system. However, this method has a problem that generates jitter when the number of steams increases. In this article, we propose the novel approach, pre-buffering policy, to overcome this problem. Pre-buffering avoids jitter by buffering the lack of data before starting service, which is estimated from the current cycle length and the maximum cycle length. We can calculate cycle length, data sire needed in each cycle and the possible lack of data caused by the increase of the number of streams using the numerical model of disk subsystem. Pre-buffering can be applied for multimedia systems and contribute to provide clients with high quality service without jitter.

Preparation of High Quality Grape Seed Oil by Solvent Extraction and Chemical Refining Process (용매추출 및 화학적 정제법에 의한 고품질의 포도씨유의 제조)

  • Choi Sang-Won;Chung Ui-Seon;Lee Ki-Teak
    • Food Science and Preservation
    • /
    • v.12 no.6
    • /
    • pp.600-607
    • /
    • 2005
  • This study was conducted to prepare high quality grape seed oils by solvent extraction and chemical refining process. Additionally, quantitative analysis of several functional components in grope seed was carried out to compare quality characteristics of grape seeds from grapes grown by conventional and organic agricultural practices. There are no significant differences in several functional constituents of grape seeds between conventionally cultivated- and organically cultivated-grapes, although some functional compositions of grape seeds are different between two cultivation methods. The dried grape seed was pretreated with roasting heating for 5 min, milled and then extracted twice with n-hexane under reflux at $50^{\circ}C$ for overnight, followed by filtration and evaporation. The crude grape seed oil was successively purified by degumming with $0.1\%\;H_3PO_4$, deaciding with $20\%\;NaOH$, and then decoloring and deodorization by a steam distillation, and thereby producing purified grape seed oil(yield: $5.0\%/dried$ grape seed). Physicochemical characteristics of the purified grape seed oil were comparable to those of the imported grape seed oils.

A Study on Time Charter Party For Offshore Service Vessels 2005 - Focusing the Dispute Resolution Clause - (2005년 해양플랜트 지원선박용 정기용선계약서에 관한 소고 - 분쟁해결약관을 중심으로 -)

  • Lee, Chang-Hee;Kim, Jin-Kwon
    • Journal of Navigation and Port Research
    • /
    • v.38 no.1
    • /
    • pp.81-87
    • /
    • 2014
  • Today, it is a trend that the demand of offshore plants is constantly growing, along with the advances in technology which are thoroughly needed to the rise of international oil price as well as offshore energy development. In addition, The main sectors of ship building, sale & purchase and chartering market regarding various kind of offshore supporting vessels that supports the business of offshore energy development is now maintaining its steady growth. However, in domestic case, the contract of time charter occasions regarding the offshore support vessel are almost non-existing situation. Thus, the relevant practical study regarding to implementation of various kinds of legal disputes and applicable laws that can be properly applied in time charter and the field of sale & purchase needs to be conducted actively. Therefore, the concept of this study has included the wide comparisons of other special provisions with the existing time-charter by making its base on "Supply Time 2005" which is the worldwide standard form of time charter in offshore support vessel market and its investigation, aiming to provide practical guidance and procedure for implementation of arbitration and applicable law issues which can be applied in legal disputes between parties.