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최적운항프로그램(Optimum Routing Voyage-NAPA DSME Power) 소개
정수원,서형균,조우성 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
The purpose of a NAPA DSME Power is to establish a mechanism for a company and/or a ship to improve the energy efficiency of a ship's operation. Preferably, the NAPA DSME Power is linked to SEEMP and a broader corporate energy management policy for the company that owns, operates or controls the ship, recognizing. NAPA DSME Power is developed to Optimise, Monitor and Follow-Up the safety and energy efficiency of a vessel or a fleet of ships. Starting with the optimal loading condition and ending with the web based portal for operational reporting. NAPA DSME Power is well matched with SEEMP. The SEEMP should be developed as a ship-specific plan by the shipowner, operator or any other party concerned, e.g., charterer. The SEEMP seeks to improve a ship's energy efficiency through four steps: planning, implementation, monitoring, and self-evaluation and improvement. NAPA DSME Power is very well following/thinking for each steps that recommended by SEEMP. NAPA DSME Power was developed for environmentally friendly operations and GHG issue. Less consumed fuel simply means lower costs but also lower emissions. Current and upcoming legislations set limits to emissions including greenhouse gases and require a follow-up tool. Such a platform minimizes the cost and workload onboard the vessels.
신동재,전진용,서형균,Shin Dong-Jae,Jeon Jin-Yong,Seo Hyung-Gyoon 한국음향학회 2005 韓國音響學會誌 Vol.24 No.1
In this Paper, the effect of stage ceiling height on the acoustic characteristics of rectangular concert halls are investigated. To find out the acoustic properties of audience area, A simple Boston Symphony Hall(BSH) model which is typically rectangular shaped was applied for computer simulation. A newly built rectangular concert hall with 400 seats was also chosen for a scale model $(1.2m{\times}0.68m{\times}0.31m)$ study and its computer simulation varing the stage ceiling height and the volume. The results show that RT increased as the stage ceiling was lowered and the difference rate of RT by its variance is from -0.09 to -0.06[sec/m]. 본 논문에서는 장방형 콘서트홀에서 무대천장높이 변화가 객석의 음향성능에 미치는 영향에 대하여 조사하였다. 먼저 컴퓨터 시뮬레이션을 사용하여 객석부에서의 음향 특성을 조사하기 위하여 대표적 장방형 콘서트홀인 Boston Symphony Hall (이하 BSH)의 단순화 모델을 적용하였다. 또한 신축된 400석 규모의 장방형 홀의 축소모형 $(1.2m{\times}0.68m{\times}0.31m)$ 실험과 축소모형의 시뮬레이션을 통하여 무대부 천장높이의 변화에 따른 객석에서의 음향특성의 영향을 측정하였다. 실험 결과, 컴퓨터 시뮬레이션과 축소모형실험 및 축소모형실험의 시뮬레이션에서 모두 무대천장높이가 낮아질수록 잔향시간이 증가하는 경향을 보였으며, 무대천장 높이에 따른 잔향시간의 변화율은-0.09[sec/m]$\~$-0.061[sec/m]로 나타났다.
실험 및 수치적 검증에 의한 FPSO 선수부 갑판침수 현상 연구
임호정,이현호,박선호,이신형,서형균,이인규 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
As ocean resources in shallow water areas are being exhausted, deep sea development is becoming common these days, as such floating type offshore structures are more competitive than fixed type structures, and FPSO is the most popular one these days. FPSO's are generally operated in a specific region and positioned to meet mostly head or bow waves in order to reduce roll motions. However this makes these vessels more vulnerable to green water around the bow region, and therefore the bow shape must be properly designed to mitigate green water damage. In the present study, experimental results for three different FPSO bow shapes in regular head waves were analyzed and compared to each other. Also, CFD computations were carried out as a sample validation case for the database built for CFD code validation.