• 한국해양공학회지
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• 제17권2호
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• pp.67-71
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• 2003

Using motions (Maruo) and wave reflection (the author), speed loss due to wind (van Berlekom) and ITTC standard spectrum, and various effects of weather(:such as weather intensity, ship type, ship size and draught) on ship speed performance at sea were investigated. Further, a comparison of the relative effects of weather and hull roughness on speed loss was also studied for a VLCC.

• 한국CDE학회논문집
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• 제16권3호
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• pp.187-196
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• 2011

Generally, BOM (Bill of Material) means a part list which is needed to manufacture or assemble a product or part. During manufacturing processes, BOM is inevitably required for most of enterprise processes such as design, procurement, production planning/control, resource planning, and financial works. Every manufacturing industry uses many kinds of BOM's that are adjusted to the requirement of functions of their work division. Moreover, BOM evolves in different forms according to the product development phases such as conceptual design; function design, detail design, and production design because it is necessary to use different product structures to keep product data generated throughout the lifecycle of a product. This includes all data and information related to the all the product development phases. Shipbuilding works also are processed and controlled based on BOM. However, effective maintenance of ship outfitting BOM data is getting difficult as the amount and complexity of data have increased due to variety and long lifecycle of ship. For the effective management of outfitting BOM data, two aspects must be considered. One is how to classify numerous BOMs type and the others how to display BOMs. So this study suggests a method to classify BOM types and propose two categories - Structure BOM, Display BOM. Base on this result, we propose the integrated ship outfitting BOMs model and analysis outfitting BOMs.

• 한국해양공학회지
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• 제14권4호
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• pp.17-22
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• 2000

As the offshore oil fields are moved to the deep ocean, the oil production system of FPSO(Floating Production Storage and Offloading System) Type are constructed frequently these days. So, it is very important to estimate the drift motion and damping effects due to the drift motion simultaneously. The components of slow drift motion damping consist of viscous, wave radiation effect and wave drift damping. It is needed to estimate the wave drift damping more accurately than others. The wave drift damping signifies the time-rate of mean wave drift force on oscillating ship or ocean structure which constant speed. In order to calculate this, the 3-Dimensional panel method is employed with the translating and pulsating Green function in the frequency domain. The calculation is carried out for a Series 60 ($C_B$/=0.7) and the results are compared with other numerical ones.

• 대한조선학회지
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• 제6권2호
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• pp.11-16
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• 1969

Chine형(型) 선체(船體)의 상하진동시(上下振動時) 수선하(水線下) 선체표면(船體表面)에 작용(作用)하는 2차원적(次元的) 유체압력(流體壓力)의 분포특성(分布特性)을 고찰(考察)할 목적(目的)으로 앞서 발표(發表)한 논문(論文) [1]에서 채용(採用)했던 Chine형(型) 선체단면형상(船體斷面形狀)을 주는 2경수군(徑數群) 등각사상함수(等角寫像函數)를 이용(利用)하여 변동압력(變動壓力)의 분포(分布)를 계산(計算)하고 이를 Hypotrocoid성질(性質)을 갖는 Lewis form, 원단면(圓斷面), 타원단면(楕圓斷面), 삼각형단면(三角形斷面) 및 사각형단면(四角形斷面) 등(等) 여러 가지 다른 단면형상(斷面形狀)을 가지는 주상체(柱狀體)들의 경우(境遇)와 비교검토(比較檢討)하였다.

• International Journal of Precision Engineering and Manufacturing
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• 제8권1호
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• pp.11-15
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• 2007

Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace components, building structures, ship materials, sporting goods and others, It is worth while to use composite space substitute material in various applications when compared with others. But the use of composite material is limited in the field of the mechanical processing because of the difficulties in processing. Thus, it is proved that the surface is rough at the in and out sections of the hole processing when the GFRP is machined with HSS drill in the vertical machining center. And it is observed that the more it is processed, the more the fluid type long chip is changed into the powdered chip.

• 한국기계가공학회지
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• 제2권2호
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• pp.37-44
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• 2003

Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace industries, building structures, ship materials, sporting goods and others. It is worth the while to use composite materials as various substitutions when compared With others. But the use is limited in the field of the mechanical processing because of its difficulties in cutting. The surface roughness of in and out in the hole processing was discussed after cutting the GFRP with HSS drill in the vertical machining center. And it is observed that as it processed more, the powdered chip may be got more than the fluid type long chip.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.102-107
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• 2012

In this study, the design procedure of hybrid active mount by an electro-magnetic actuator is proposed to reduce the transmitted force from naval shipboard equipment to ship hull structure. The hybrid type mount which is composed of a passive rubber element and an electro-magnetic actuator is introduced and, through the vibration measurement for the objective pump system, the required force of the actuator is computed and discussed in detail. The initial designs were supposed for three types, one is moving coil type actuator and the others are moving permanent magnet type actuators. Based on the initial design concept, the final designs considering shock resistance and interference with mover and stator are proposed and examined.

• 한국해양환경ㆍ에너지학회지
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• 제17권4호
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• pp.297-305
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• 2014

본 연구에서는 2013년 11월 21일부터 30일까지 9일간 이어도 종합해양과학기지에 선박자동식별장치(AIS)를 설치하여 관할해역과 한 중 잠정조치수역의 항행 선박 및 어업활동을 모니터링하기 위해 선박정보를 수집하였다. 수집된 AIS 원시자료는 자체적으로 개발된 프로그램을 이용해 선박의 고유정보(해상이동업무식별번호, IMO 번호, 호출 부호, 선명 등)와 위치정보(위치, 속력, 침로 등)를 추출하고, 국적과 선종 정보만을 이용해 선박을 분류하였다. 선박의 국적 정보는 해상식별부호(MID)로 파악되는데, 소형선박에서 많이 탑재하고 있고 기능이 보다 간소화된 소출력의 Class B AIS는 국제해사기구(IMO)의 탑재 요건을 따르고 있지 않아 국적을 알 수 없는 선박이 다수 존재함을 확인하였다. 국적 정보를 가지고 있는 선박 중에서는 중국선박과 한국선박이 많았으며, 선종정보를 가지고 있는 선박 중에서는 화물선, 어선 순으로 많았다. 또한 국적을 알 수 없는 선박의 특성을 파악하기 위해 이어도해양과학기지 주변의 항행빈도수가 높은 중국선박과 한국선박의 항적과 비교하였으며, 이를 통해 국적미상 선박이 중국선박의 항행경로와 높은 유사성을 보이는 것을 확인하였다. 따라서 이 해역에서 중국어선은 선단의 형태로 자주 출몰하는 것으로 판단된다.

• 한국항해항만학회지
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• 제38권5호
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• pp.527-539
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• 2014

본 연구는 외국인 선원의 혼승형태와 혼승비율, 이문화 수용 및 적응에 따른 집단응집성, 조직몰입 및 직무만족의 인과관계를 규명하기 위한 연구모형과 가설을 설정하였다. 가설 검증을 위해 혼승선박을 대상으로 설문조사를 실시하고 변인들의 관계를 회귀분석을 통해 실증분석하였다. 분석결과, 한국인 선 기관장과 외국인 사관 혼승선박의 집단응집성과 조직몰입 및 직무만족이 한국인 선 기관장과 한국인 사관 승선선박 보다 더 높은 것으로 나타났다. 혼승비율에서는 외국인 선원의 비율이 31~50%일 경우의 집단응집성이 다른 혼승 비율에 비해 낮은 것으로 나타났다. 그러나 혼승형태 및 비율과 집단응집성에 대한 이문화 수용과 적응의 조절효과는 나타나지 않았다. 그리고 집단응집성이 높은 혼승선박에서는 조직몰입도와 직무만족도가 높아지는 것으로 나타났다. 본 연구의 결과는 해운선사 및 선박관리사에 선원들의 직급별 혼승형태와 외국인 혼승비율을 조절하여 혼승선박 내의 집단응집성과 직무만족도 및 조직몰입도를 높여줄 수 있다는 것을 제시하고 있다.

• 수산해양기술연구
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• 제56권2호
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• pp.172-182
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• 2020

In order to offer specific information needed to assist in operation of a ship with same type rudder through evaluating the maneuverability of training ship A-Ra with flapped rudder, sea trials based full scale for turning test, zig-zag test with rudder angle 10° and 20°, and spiral test at service condition were carried out on starboard and port sides around Jeju Island according to the standards of maneuverability of IMO. As a result, the angular velocity of port turn was higher than that of starboard turn. Therefore, the size of turning circle was longer on the starboard side. In addition, variation of the transfer due to various factors was more stable than those of the others. In the Z-test results, the mean of 1st and 2nd overshoot angles were 9.8°, 6.3° and 15.3°, 9.2° respectively when the port and starboard was 10°; the 1st overshoot angle were 18°, 13.7° when using 20°. Her maneuverability index T' and K' can be easily determined by using a computer with the data obtained from Z-test where K' and T' are dimensionless constants representing turning ability and responsiveness to the helm, respectively. In the Z-test under flap rudder angle 10°, the obtained K' value covered the range of 2.37-2.87 and T' was 1.74-3.45. Under the flap rudder angle 20°, K' and T' value showed 1.43-1.63, 1.0-1.73, respectively. In the spiral test, the loop width was unstable at +0.3° and -0.5°-0.9° around the midship of flap rudder. As a result, course stability was comparatively good. From the sea trial results, training ship ARA met the present criterion in the standards of maneuverability of IMO.