• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2011.04a
• /
• pp.463-468
• /
• 2011

The prospect of Arctic trade transportation opening on a year-round basis creates a vast opportunity of exploring untapped resources and shortened navigational routes. However, the environment's remoteness and lack of technical experiences remains a big challenge for the maritime industry. With this, engine designers and makers are continually investigating, specifically optimizing propulsion shafting system design, to meet the environmental and technical challenges of the region. Further, classification societies recognize the need to upgrade the Unified Rules concerning elements to meet current Polar requirements. Hence in this paper, excitation torque calculation on Polar class vessels propulsion shafting system will be reviewed. The propeller - ice interaction load effect, which is a main consideration of excitation source of Polar Class propulsion shafting system, on shaft design calculation will be analyzed.

• Proceedings of the KIEE Conference
• /
• 1994.11a
• /
• pp.141-143
• /
• 1994

The pulse width modulated class D power amplifier has the highest efficiency among various class amplifiers but the performances, such as bandwidth, distortion and stability are inferior to the conventional ones. In this paper, a new class D amplifier design is Presented employing dual feedback loops namely current and voltage feedback. The new design provides wide full-power bandwidth and stability at any load with high efficiency.

• Korean Institute of Interior Design Journal
• /
• no.38
• /
• pp.201-208
• /
• 2003

Shipboard architecture and design has now become a specialty In its own right. As rationalized as the process of ship' design and built is, it continues to produce some remarkable fleet image. Cruise line has created a number of the hall mark identities and the interior design features of its own. It is to develop a design theme for a reference ship which sets a particular image for later new buildings to follow in same class. When a new class Is created later, key design element will be retained, with some items being changed and new ideas introduced. Thus the approach has the flexibility to grow and change as the industry itself evolves and diversifies. There are a number of notable examples which illustrate how different line are thus able to create and maintain unique product hallmarks and identities through the interior design of their fleets.

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.20 no.1
• /
• pp.28-33
• /
• 2011

In this paper, structural design for 2kW class composite blade is performed by using design of experiment(DOE). A full factorial design is applied to meet the design specifications at the manufacturing process. The analysis of variance(ANOVA) is made in order to determine the significance of effects in an analysis. Structural analysis by using of commercial software ABAQUS is performed to compute the displacement and safety factor of filament wound composite blade. The results show that the proposed method is suitable to analyze the factors at the design of wind turbine blade.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.45 no.1
• /
• pp.110-114
• /
• 2008

In this paper, high efficient class F power amplifier with dual band has been realized. Dual band power amplifier have used modify stub matching for single FET, center frequency 2.14GHz and 5.2GHz respectively. Dual band amplifier is 32.65dBm output power, gain 11dB and PAE 36% at the 2.14GHz, 7dB gain at the 5.2GHz. Design of a dual band class F power amplifier using harmonic control circuit. The measured are 9.9dB gain, 30dBm output power and PAE 55% at the 2.14GHz, 11.7dB gain at the 5.2GHz. This paper is being used the load-pull method and it maximizes output power and it is using the only one transistor in the paper. As a result, this research will obtain a dual band high PAE power amplifier.

• Management Science and Financial Engineering
• /
• v.12 no.1
• /
• pp.79-94
• /
• 2006

In this paper, we readdress a layout design problem, PTL[3], for determining an optimal 3-class-based dedicated linear storage layout in a class of unit load storage systems. Based on some fundamental properties derived, we provide a converging exact algorithm with O(n[logn]), which is more efficient than that of Yang and Kim [8] and can be applied to PTL[K] with $K{\ge}4$ in order to reduce computational execution time. In addition, we prove that the necessary condition suggested by them is also a sufficient condition to PTL[3].

• 제어로봇시스템학회:학술대회논문집
• /
• 2003.10a
• /
• pp.2424-2429
• /
• 2003

The importance of e-Learning, which supports to study anywhere and anytime, has been pointed out for improving education. There have been various research papers on e-Learning system for educations. Most of literatures have focused on guiding the student or measuring understanding their level etc. Design method of e-Learning system has not been discussed based on structure and analysis of the class. In this paper, scheme of the class is proposed by analyzing and structuring class, then design method of e-Learning system is discussed based on it.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.13 no.1
• /
• pp.13-21
• /
• 2017

This paper describes a design scheme of a system that tests or polls from the students at online class. By online test, the teacher can test the pre-knowledge level of the students and know how much students understand the lecture of the class. As the number of test increases, the burden of the preparation of setting question, evaluation of the test, and management of the test results is increased. In this environments, an online test management system make it easy to test and evaluate, and thus it would be a good tool for maintaining and managing the total procedure of the test or poll of the students. For evaluating the design of the system, we made a test system prototype and performed evaluations of the online test system. The online test and evaluation system provides a good tool for testing and evaluation of student's knowledge at the class with easy and fast way.

• Korean Institute of Interior Design Journal
• /
• no.20
• /
• pp.78-83
• /
• 1999

The purpose of this study is to find out the symbolic meaning of interior color a the chosun dynasty's upper class houses, and to review it from a point of view of the Western coloring harmony theory. from this study, the Oriental philosophy, the ideas of Confucianism, and the ethnic traits influenced the interior color of the Chosun Dynasty's upper class houses like an-bang or sarang-bang. The results indicated that main color, auxiliary color, accent color were harmonized with similar harmony by hue and with contrast harmony by value and chroma. Therefore, interior color image of Korean traditional houses should be applied to the various design field as well as modern interior desigv.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.10 no.2
• /
• pp.38-46
• /
• 2007

This paper proposes a design method of a CDU(Control Display Unit) for commercial INS(Inertial Navigation Systems). In order to guarantee reusability and extendability, the design method is based on the class programming of the Windows operating system. Since the CDU has abstracted functions and variables, it can be interfaced with any INS. It is also easy to extend the designed functions using inheritance and polymorphism of the class. In order to show usefulness of the CDU, it has been implemented for the H-726 INS.