• Special Issue of the Society of Naval Architects of Korea
• /
• 2013.12a
• /
• pp.1-7
• /
• 2013

In past decades, a maximum standard vessel size for chemical tankers is not normally larger than 55,000 TDW due to the characteristic of chemical product shipment which is so variable but small quantity unlike single product carries such as crude oil tankers. These days, as demand of very large chemical tanker is rising due to the change of market trend of chemical product shipment, 75,000 TDW class chemical tanker has been developed. The newly developed vessel's structure has been designed based on CSR (Common Structural Rule) for double hull oil tankers (hereafter CSR) published by IACS (International Association of Classification Societies). However, due to the large difference from typical oil tankers, many items should be specially considered such as on deck transverse and corrugated bulkheads. In addition, two longitudinal bulkheads without upper stool have been constructed in order to maximise the number of cargo tanks and the volume of each cargo tanks. In this study, key word of the vessel has been briefly reviewed and the structural reliability of the proposed vessel has been investigated.

• Journal of Korean Society for Quality Management
• /
• v.29 no.3
• /
• pp.151-165
• /
• 2001

The purpose of this study is to develop systematic methods for evaluating the suitability of a seat and build an empirical model for predicting the suitability of a seat. The following research schemes were pursued to achieve the objectives - Development of suitable chair dimensions - Analysis scheme for decomposing the human-product interface system - Development of model for evaluating suitability. As a result, we uncovered six dominant suitability dimensions for the design of a comfortable seat that is related to the physical dimension of a body, Here, six suitability dimensions were identified as the dimensions that represent the human sensitivity and psychological feeling on comfortable seats. Also, 43 human-interface elements (HIE's) such as seat height, seat width, seat depth, tilting angle, seat surface etc. were investigated. HIE was generally defined as the physical characteristic of manufacturing goods, and it had close related to the body dimension of a user and environment that it was used.

• Culinary science and hospitality research
• /
• v.8 no.3
• /
• pp.21-37
• /
• 2002

The purpose if this study is to analyze the psychological preference of Family Restaurants and their behavioral characteristic and its segmentation, positioning, new product development and marketing min. Result of analysis, index and type of MBTI psychological preference are related to Family Restaurant Choice attributes intimately. Specially, "Menu composition reflected restaurant image", and "Providing of corresponded value to price"were shows considerable difference according to psychological preference. And "Providing of the corresponded value to price"of Value, Price and Image Factor, indexes, types, including all the other aspects, shows the most considerable difference. Therefore, all market of Family Restaurant when inventing or designing a menu, they should consider restaurant′s concept and image to manage a menu, and keep in mind that all customer take "value"at up most importance.

• Proceedings of the KIEE Conference
• /
• 2008.11a
• /
• pp.191-193
• /
• 2008

This paper describes a compact Iron-cored Electronic Current Transformer(ECT) based on IEC 61850. The ECT developed in this study has the feature of designing the current transformer with a compact iron-core, compensating error due to the nonlinear characteristic of Iron-core, and applying IEC 61850 9-2 for sampled value(SMV). We verify the performance of the innovative product developed in the study in KERI and test the performance of digital communication in the lab.

• Communications of the Korean Mathematical Society
• /
• v.30 no.3
• /
• pp.143-154
• /
• 2015

Characterizations of hesitant fuzzy left (right) ideals are considered. The notion of hesitant fuzzy (generalized) bi-ideals is introduced, and related properties are investigated. Relations between hesitant fuzzy generalized bi-ideals and hesitant fuzzy semigroups are discussed, and characterizations of (hesitant fuzzy) generalized bi-ideals and hesitant fuzzy bi-ideals are considered. Given a hesitant fuzzy set $\mathcal{H}$ on a semigroup S, hesitant fuzzy (generalized) bi-ideals generated by $\mathcal{H}$ are established.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.342_343
• /
• 2009

This paper describes a compact Iron-cored Electronic Current Transformer(ECT) based on IEC 61850 9-2. The ECT developed in this study has the feature of designing the current transformer with compact iron-core, compensating error due to the nonlinear characteristic of iron-core, and applying IEC 61850 9-2 for sampled value(SMV). We test the performance of the product developed in the study in KERI, KEPRI.

• Korean Journal of Computational Design and Engineering
• /
• v.4 no.3
• /
• pp.259-268
• /
• 1999

In order to reduce the cost of product and save the processing time, optimal nesting of two-dimensional part is an important application in number of industries like shipbuilding and garment making. There have been many studies on finding the optimal solution of two-dimensional nesting. The problem of two-dimensional nesting has a non-deterministic characteristic and there have been various attempts to solve the problem by reducing the size of problem rather than solving the problem as a whole. Heuristic method and linearlization are often used to find an optimal solution of the problem. In this paper, theoretical and practical nesting algorithm for rectangular, circular and irregular shape of two-dimensional parts is proposed. Both No-Fit-Polygon and Minkowski-Sum are used for solving the overlapping problem of two parts and the dynamic programming technique is used for reducing the number search spae in order to find an optimal solution. Also, nesting designer's expertise is complied into the proposed algorithm to supplement the heuristic method.

• Journal of ILASS-Korea
• /
• v.8 no.3
• /
• pp.27-32
• /
• 2003

It is important to improve the efficiency of the existing small scale burner which used in agricultural product dry system and gardening dry system. In order to economize fuel Consumption and decrease the exhaust emission especially $CO_2$, the better design for the small scale burner is needed. Spray characteristics are the essential element for the design. Macroscopic spray characteristics such as spray angle and breakup length were measured. SMD which is contained the Microscopic spray characteristics was measured too. SMD was measured at 8mm, I2mm, I6mm downstream of the nozzle tip for both Hago and Danfoss nozzles by the Malvern Particle Sizer.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.10a
• /
• pp.355-360
• /
• 2000

Recently, to be satisfied the consumer's demand the life cycle and the lead time of product is to be shorted. So it is important to reduce the time and cost in manufacturing prototypal mold. These days, in order to reduce the lead time and cost high speed machining is highlighted. In the paper, using the high speed machining and aluminum-7075, the fundamental experiment is implemented in the change of cutting force, machining time, surface characteristic according to the tool path. And then the prototypal mold of the automatic knob is machined.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2006.05a
• /
• pp.690-695
• /
• 2006

This paper described the Performance test and sound characteristics of helicopter 'Tail-Fan' anti-torque system. In this research, Korea Aerospace Research Institute(KARI) developed 'Tail-Fan' anti-torque system for a helicopter and carried out performance and sound capturing tests of even and uneven tail fans. The performance test is carried out and the noise signals which are generated during the test are saved with microphones at the same time. The performance test's results meet the design requirements. Tone-corrected perceived noise level is reduced by replacing the even product with the uneven one.