• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.1
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• pp.89-99
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• 2014

This paper presents the experimental torque disturbance analysis of a missile hatch system by spline backlash. The missile hatch system uses a spline and gear train for vertical elevation of the heavy hatch. The spline used for the rotation shaft of the hatch is generally used for automotive driving parts that transmit high amounts of power. It has an angular backlash, which results in jerks. Backlash of the hatch spline influences hatch swinging. The spline backlash and hatch swing are experimentally analyzed by measuring the hatch's rotation angle and acceleration. Hatch swing is visually observable for a short period, and it is measured by measuring the rotation angle variation and hatch acceleration. The shape of fluctuation and duration time of hatch angle variation are similar to those of torque. This shows that the hatch swing due to spline backlash generates torque disturbances.

• The Journal of Engineering Geology
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• v.2 no.2
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• pp.201-211
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• 1992

The various hatch patterns supplied by CAD systems are not sufficient for the preparation of geotechnical map and their use can often mislead to a wrong map interpretation. To use, edit, and communicate the geotechnical map information with ease among many CAD user, unified drawing file format is suggested. New hatch patterns are designed and suggested to use with geotechincal jobs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.305-312
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• 2021

This study examines the damage to the submarine's escape trunk hatch spring through microstructure analysis. The cause of the escape trunk's damage during the submarine's construction and its improvement measures were reviewed. To determine the cause of breakage of the escape trunk spring, samples were taken from the damaged product and analyzed for chemical composition, hardness, and microstructure. In particular, the breakage part of the spring was analyzed in-depth by using a scanning electron microscope to determine the cause of corrosion destruction. Finally, a spring shape design method was proposed through the investigation of the cause of spring breakage. In addition, a newly improved spring was produced by applying a nylon coating with excellent corrosion resistance and abrasion resistance. Applying to an actual submarine trunk hatch revealed that the coating peeling phenomenon due to the contact between the springs is significantly improved when the hatch is opened or closed compared to the existing products.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2002.05a
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• pp.106-111
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• 2002

해상운송에서 규모의 경제 이익을 달성하기 위해 선박의 크기가 대형화되고, 항만이 중심항만과 주변항만으로 양분화 되어감에 따라 컨테이너 터미널의 효율적 운영을 통한 경쟁력 확보가 중요시되고 있다. 컨테이너의 효율적인 적하는 선박의 효율과 양적하에 직접 관여하는 터미널 중심 장비인 켄트리 크레인의 효율을 극대화하도록 계획되어야 한다. 적하 문제는 선박의 크기와 각 터미널에서의 적하량에 종속되는 NP-hard 문제이다 본 연구에서는 컨테이너 적하 문제를 크게 두 개의 단계로 나누어 적하 계획을 수행한다. 무한한 경우의 수를 두 단계로 나눈 계획 시스템에 의해 크기를 줄인다. 첫 번째 단계는 컨테이너를 선박의 각 해치별로 배치하는 단계이고, 두 번째 단계는 각 해치별로 배정된 컨테이너를 특정 슬롯에 배치하는 것이다. 이렇게 분해된 문제의 각 단계에서 유전 알고리즘(Genetic Algorithm)을 사용하여 최적의 적하계획을 세운다. 그리고 정기 컨테이너선의 운항모형을 수립하고, 각 항구에서의 양·적하를 수행하여 구축된 시스템의 적합성을 시뮬레이션하여 평가한다

• Journal of the Society of Naval Architects of Korea
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• v.43 no.3 s.147
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• pp.331-339
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• 2006

The objective of this paper is to calculate the fatigue strength for upper deck hatch corner insert plate of large container carriers without wave load analysis and global finite element analysis at the initial design stage. Wave load analysis and global F.E. analysis for three container carriers have been performed by GL(Germanischer Lloyd) procedure to propose the equation for hatch corner stress range which is the important factor in fatigue strength calculation. Considering the restraining effect of bulkhead, three types of equation, that is, single tight bulkhead, double tight bulkhead and support bulkhead have been proposed. Using the proposed equations, a simplified fatigue analysis based on GL rules has been performed for two container carriers of which fatigue strength analysis was carried out by GL. From the comparison between fatigue strength result of using the proposed equations and that of GL, it has been found that proposed stress range equations are useful for scantling of upper deck hatch corner insert plates for over 8,000 TEU class container carriers.

• Cartoon and Animation Studies
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• s.17
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• pp.133-146
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• 2009

In modern days, the iconic symbolicity of animal characters functions as a sign by the social promise after being made with voluntary intentions. Representing a public organization or corporation, an animal character is put to active use as a symbol. Today illusionary animal characters serve as important icons, and product developers incessantly put out animal contents. This study set out to examine the applications of animal characters in modern times according to media development by integrating animal characters into animation, which was the beginning of animal characters, based on the theoretical background of "symbolicity" in the aesthetics history. It also analyzed the symbolicity of "Haechi," which is Seoul's animal character and one of the good examples of utilization of a promotional animal character by a corporation or public organization.

• Proceedings of the KIEE Conference
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• 2006.07e
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• pp.11-12
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• 2006

본 연구는 최근 수행한 해치 소수력 발전설비에 대한 최적 소수력개발과 수용가로의 소규모 단독전력계통 구성을 위해 조사 설계에 필요한 설계인자를 도출하여 비교분석, 설계에 적용한 사례를 중심으로 작성되었다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.37-39
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• 2005

컴퓨터통신기술과 정보처리기술의 발전으로 멀티미디어 콘텐츠의 활성화를 촉진하였다. 정보화시대 국가경쟁 사업으로 정부차원에서도 문화 콘텐츠 개발을 국제적 경쟁력을 가진 고품질의 문화콘텐츠를 제작공급할 수 있는 핵심 성장기반을 조성하기 위하여 국가사업으로 확대하고 있다. 본 논문에서는 멀티미디어 콘텐츠 보호를 위하여 해치체인 알고리즘을 이용한 멀티미디어 데이터의 암호화 기법을 제안하였으며, 인가된 사용자 확인을 위하여 사용자인증 및 키 전송 알고리즘을 이용하여 사용자인증 및 키전송 프로토콜을 설계하였으며, 복호화시 재생 지연시간을 줄이기 위하여 이중버퍼를 구성 효율적인 버퍼 스케줄을 이용하여 멀티미디어 콘텐츠의 실시간 복호화 방법을 제안한다.

• Proceedings of the SAREK Conference
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• 2004.11a
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• pp.131-131
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• 2004

• Journal of Institute of Control, Robotics and Systems
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• v.19 no.12
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• pp.1111-1118
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• 2013

In this paper, the disturbance applied to launcher hatch by ship motions is introduced to identify the vertical ship motion disturbance. Basically, ship motions are comprised of 6 degrees of freedom: roll, pitch, yaw, heave, surge and sway. In the case of the shipboard launcher hatch the coupled pitch, heave and roll are significant motions to be transformed to a vertical direction motion. The maximum acceleration values are obtained from the vertical motion model and the ship motion data in accordance with ship type and hatch location on the ship. We verify that the maximum pitch motion mainly influences the launcher hatch and also present the quantity of the maximum load disturbance by the ship's motion acceleration.