• Bulletin of the Society of Naval Architects of Korea
• /
• v.27 no.3
• /
• pp.117-126
• /
• 1990

In the early stage of ship design process large number of alternative compartment layout designs are generated and examined iteratively. Therefore, the design efficiency will be considerably enhanced if a tool is available to perform this kind of iterative design process effectively in a relatively short time. This paper describes a method for generating and evaluating various alternative compartment layout designs in a personal computer. In this method, computer model of a compartment layout is generated by establishing the hierarchical structure of the entities forming a compartment and defining clearly the relationships among the entities. The evaluation of the design alternatives are effectively performed utilizing the computer model generated. The data structure for storing the defined compartment layout is explained and an illustrative example is given showing the application of the method to the design and evaluation of compartment layout of an Oceanographic Research Vessel.

• Journal of the Society of Naval Architects of Korea
• /
• v.30 no.3
• /
• pp.16-28
• /
• 1993

The object-oriented paradigm is being recognized as the most effective technique to develope the complex, large software system. In this paper, we propose the modeling methodology using object-oriented technology for the ship compartmentation design(OO _COMDEF) based on the proposed modeling methodology. Illustrative examples to show the application of the prototype system are given.

• Proceedings of the CALSEC Conference
• /
• 1997.11a
• /
• pp.347-354
• /
• 1997

많은 사람들이 다가오는 21세기는 정보화의 시대라고 말한다. 그러면 10년 후의 조선소 모습은 오늘날과 어떻게 달라질까\ulcorner 아마도 주요치수를 정하고 선형설계, 구획배치, 선체설계 및 의장설계 등의 설계과정을 거친 다음 철판을 잘라내고 다시 용접하여 부품을 만들고 그것들을 조립한 다음, 각종 기자재들을 설치하여 배를 만드는, 조선공학적인 측면에서의 전통적인 업무흐름은 크게 달라지지 않을 것이다.(중략)

• Journal of the Society of Naval Architects of Korea
• /
• v.46 no.4
• /
• pp.424-434
• /
• 2009

Recently, compartment design of a naval ship for efficiently utilizing the limited spaces has become more important. However, the compartment design of the naval ship was not optimized like that of a commercial ship because of a number of design requirements. Thus, the task is being manually performed using the data of parent ships and designers' experiences. To improve this procedure, an optimal compartment design system, which can generate better compartment design result with the satisfaction of various design requirements, is developed in this study. Finally, to evaluate of the applicability of the developed system, it is applied to the compartment design of a 9,000ton missile destroyer(DDG). The result shows that the developed system can yield better result than original design.

• Journal of the Society of Naval Architects of Korea
• /
• v.29 no.4
• /
• pp.45-57
• /
• 1992

In this paper, the trends for the standardization of the product model was surveyed, and the product model can be used as concrete means to realize the communication of information between the CAD/CAM softwares, which are used for the design and manufacturing of the complex products such as ships. We have proposed the newly developed methodology for the representation and definition of the ship model on a basis of the product model. And also we have studied the product modeling technology for the aspect of an application, and the object-oriented system technology have been surveyed for the system implementation issues. We would like to verify the consistency and correctness of our proposed representation methodology by using the prototype application model, which is applied to design work of ship compartmentation model. For this purpose we have developed the "OO_COMDEF"(which means the Object-Oriented System for the Compartmentation Definition of ship) program that is applied to the compartmentation model which can be considered as a submodel of the general ship models. The results of research work have been proved that the representation methodology for the ship model based on the product model is an efficient and appropriate scheme for the ship model definitions. Consequently, this methodology can be proposed as a fundamental framework for the development of the shipbuilding CAD/CAM system.

• Fire Science and Engineering
• /
• v.28 no.5
• /
• pp.44-51
• /
• 2014

In this study, the Mock-up office space experiments have been performed for the fire behavior analysis of the compartmented space used for the performance-based fire safety design of buildings. Mock-up test was conducted using the compartmented office space dimensions, which are 2.4 m wide, 3.6 m wide, and 2.4 m hight. Test was conducted with the combustible materials such as a desk, a chair, a computer ect. The fire load in the Mock-up office space was $18.74kg/m^2$. As a result, the temperature of the central compartment space to reach $600^{\circ}C$ were 394 to 408 s. The temperature of the corner near the entrance edge to reach $600^{\circ}C$ were 404 to 420 s. At this study, the temperature curve in the compartmented space has been predicted using the temperature data appling the BFD curve. The BFD curve factor based on the fire tests was determined by the maximum temperature of $900^{\circ}C$, 7 min to reach the maximum temperature, and the shape coefficient of 1.5. The initiating fire was rapidly increased to 9 min, and decreased.

• The Korean Journal of Applied Statistics
• /
• v.19 no.2
• /
• pp.231-240
• /
• 2006

It is well understood that a paired comparison (paired t test) provides better precision than a group comparison (two-sample t test), when the pairing is effective (the variation within a pair is small). However, when the variation among the pairs is sufficiently small, the group comparison is likely to yield a better result. To get a statistical explanation of this, we examine the two methods through an analogy to one-way and two-way analysis of variance. We introduce a new measure, R statistic, which is the ratio of their confidence interval lengths, as a quantitative criterion for comparing the two methods. The distribution of the Rf statistic is described by t and F distribution functions. Through this characterization, we show that the paired comparison can be better than group comparison when the variation among the pairs is statistically significantly large.

• Journal of the Society of Naval Architects of Korea
• /
• v.50 no.1
• /
• pp.59-68
• /
• 2013

Nowadays, optimum structural design techniques based on CSR have been developed and applied to the preliminary design stage focused on minimum weight and minimum construction cost of ship structure. Optimum structural design algorithm developed before could minimize weight and cost on fixed compartment arrangement. However, to develop more efficient design technique, a designer needs to combine optimized compartment arrangement with optimized ship structural design because compartment arrangement has a large effect on structural design according to the change of still water bending moment as a consequence of compartment arrangement change. In this study, automated algorithm for compartment arrangement of an oil tanker is developed to apply preliminary structural design. The usefulness of developed algorithm is verified with Aframax oil tanker constructed by STX shipbuilding Co.Ltd..

• Journal of the Society of Naval Architects of Korea
• /
• v.54 no.4
• /
• pp.352-359
• /
• 2017

Because the Energy Efficiency Design Index(EEDI) came into effect in 2013, it is necessary to develop a new technology to overcome $CO_2$ emission regulations. In structural design viewpoint, lots of researches are carried out to develop eco-friendly and high fuel efficiency ships by weight reduction. By using the automated compartment arrangement system and automated structural design algorithm which were developed by the authors, new researches are performing to combine the above two systems. However, the effect of weight reduction was not significant because structural designs by using these systems for the midship part was carried out only focused on the minimum still water bending moment. In this paper, at first, good compartment arrangements which give the minimum still water bending moment and(or) shear force were chosen by using the automated compartment system. And then, influence of shear force on weight reduction was investigated by using the automated structural design algorithm considering longitudinal strength, local strength and shear strength of longitudinal members in cargo holds. Conclusively, it is necessary to consider the minimum still water bending moment and shear force simultaneously to reduce the weight of mid-sized bulk carrier. Also, good compartment arrangement which gives much more weight reduction compared with existing ship was proposed.

• Journal of the Society of Naval Architects of Korea
• /
• v.29 no.2
• /
• pp.30-37
• /
• 1992

Since a ship is a complex steel construction which consists of sculptured surfaces and inner surface members, a high technique of information modeling is indispensable to describe the form of hull surface and steel structure members consistently. A model contains both topological and geometrical information of the structural members. Therefore, the hull form should be represented by the wireframe of surface model so that the accuracy in each design stage is satisfied. The structural members like plane surfaces, stiffeners and the relations between such members are to be described systematically in data base. A collection of the data stored in database is a model to be built. The model will be used not only to generate the drawings and documents for ship design and production but also to interconnect other systems such as compartmentation, outfitting, piping, etc. Computer graphics is adopted of the visualization of model.