• Journal of Ginseng Research
• /
• v.13 no.1
• /
• pp.136-141
• /
• 1989

The purpose of this survey was to understand the attitudes, consumption patterns and preferences of domestic consumers relating to ginseng products in general. This study involved 1,305 people (420 agents, 742 ginseng farmer, 143 staff of Korea Tobacco and Ginseng Co.). The results obtained are summerized as follows. 1, Preferences for ginseng were very high for the majority of the respondents. 2. Most (80%) of the respondents had experience in taking ginseng. They expected ginseng to have efficacy as remidy for the hang-over syndrome, gastronil troubles and high blood pressure, in that order. 3. The patron of ginseng were, for the most part, men in the prime of manhood and old age. The favored products and the preferences regarding the organic condition of the ginseng products differed by sex and age. 4 To sum up the results of this study, we conclude that moderate priced ginseng products, not only easy to use and carry but also attractive to age and sex, should be developed without losing the efficacious components and characteristics.

• Journal of the Korean Society of Systems Engineering
• /
• v.2 no.2
• /
• pp.21-26
• /
• 2006

In modern systems technology, increasingly more systems are anticipated to operate in real-time environment. These systems are usually complex to implement since it is not easy to satisfy the real-time requirement for both hardware and software components simultaneously. In this paper, we first review an object-oriented development process that was proposed earlier for software-intensive real-time system using the Unified Modeling Language (UML). We then study how to improve the problems that the UML approach might have. Applying the systems engineering(SE) process yields useful results which include : 1) an improved requirements management over the whole system life-cycle ; 2) a detailed scenario on how to carry out the SE process ; and 3) a conversion process from the text-based requirements to the UML-based graphic ones.

• ETRI Journal
• /
• v.28 no.5
• /
• pp.638-647
• /
• 2006

This paper investigates two kinds of strategic combinations carried out by the European telecom operators between 1986 and 2001: acquisitions, on the one hand, and strategic alliances, on the other. The aim of the paper is twofold. First, it analyzes the behavior adopted by these companies to adapt to an environment that, after the processes of globalization and privatization presents a clearly different structure. Second, it focuses on the effect that internationalization and diversification could exert over the returns obtained by the European telecom firms involved in acquisitions and alliances, differentiating when such strategic combinations are more profitable for the shareholders of the firms that carry them out.

• Structural Engineering and Mechanics
• /
• v.33 no.6
• /
• pp.747-763
• /
• 2009

In this work, the linear vibration characteristics of $90^{\circ}$ pipe bends and their cylindrical and toroidal shell components are studied. The finite element method, based on shear-deformation shell elements, is used to carry out a vibration analysis of metallic multiple $90^{\circ}$ mitred pipe bends. Single, double, and triple mitred bends are considered, as well as a smooth bend. Sample natural frequencies and mode shapes are given. To validate the procedure, comparison of the natural frequencies is made with existing results for cylindrical and toroidal shells. The influence of the multiplicity of the bend, the boundary conditions, and the various geometric parameters on the natural frequency is described. The differential quadrature method, based on classical shell theory, is used to study the vibration of components of these bends. Regression formulas are derived for cylindrical shells (straight pipes) with one or two oblique edges, and for sectorial toroidal shells (curved pipes, pipe elbows). Two types of support are considered for each case. The results given provide information about the vibration characteristics of pipe bends over a wide range of the geometric parameters.

• Proceedings of the KSR Conference
• /
• 2003.10c
• /
• pp.587-593
• /
• 2003

There has been much interest in the Bluetooth technology since it could enable users to connect to a wide range of computing and telecommunication devices without the need to carry or connect cables. It delivers opportunities for rapid, ad-hoc connections, and in the future, could possibly enable automatic, unconscious, connections between devices. In this paper, we discussed a scatternet formation protocol for Bluetooth-based ad hoc networks and proposed the identification system of an object using Bluetooth Scatternets. Over the past few years, several studies have been made on the identification of an object by several RF(Radio Frequency) systems. But there are still some problems, the interference of signals as an example, for the identification of an object. The critical question is how to identify an object precisely without the interference of signals. This paper is an investigation of the Scatternet formation protocol for Bluetooth-based ad hoc networks and the identification system of an object using Bluetooth Scatternets composed of multiple Piconets.

• 전기의세계
• /
• v.31 no.3
• /
• pp.209-217
• /
• 1982

This paper considers a finite spectrum assignment Problem for a functional retarded linear differential system with delays in control only. In this problem, by generalizing from an abstract linear system characterized by Semigroups on a Hilbert space to a finite dimensional linear system, we unify the relationship between a control-delayed system and its non-delayed system, and then by using the spectrum of the generator-decomposition of Semigroup, we try to get a feedback law which yields a finite spectrum of the closed-loop system, located at an arbitrarily preassigned sets of n points in the complex plane. The comparative examinations between the standard spectrum assignment method and the method of spectral projection for the feedback law which consists of proportional and finite interval terms over present and past values of control variables are also considered. The analysis is carry down to the elementary spectral projection level because, in spite of all the research efforts, so far there has been no significant attempt to obtain the feedback implementation directly from the abstract representation forms in the case of multivariables.

• Proceedings of the KIEE Conference
• /
• summer
• /
• pp.896-898
• /
• 2004

The lagging reactive power should be supplied for the excitation of isolated squirrel-cage induction generators by external circuit. This paper deals with a technique to drive the equations for analysis of the excitation characteristics and performance of an isolated squirrel-cage induction generator from the conventional equivalent circuit of induction machine, transform the equations into d-q coordinates to use vector control technique, and carry out the simulation of an induction generator system with various conditions using MATLAB. The results of the simulation indicate that moderate reactive power can be controlled effectively to maintain constant voltage over a wide range of the rotor speeds and loads.

• International Journal of Aeronautical and Space Sciences
• /
• v.13 no.1
• /
• pp.1-13
• /
• 2012

Over 3.8 billion years, through evolution nature came up with many effective continually improving solutions to its challenges. Humans have always been inspired by nature capabilities in problems solving and innovation. These efforts have been intensified in recent years where systematic studies are being made towards better understanding and applying more sophisticated capabilities in this field that is increasingly being titled biomimetics. The ultimate challenge to this field is the development of humanlike robots that talk, interpret speech, walk, as well as make eye-contact and facial expressions with some capabilities that are exceeding the original model from nature. This includes flight where there is no creature that is as large, can fly as high, carry so heavy weight, fly so fast, and able to operate in extreme conditions as the aircraft and other aerospace systems. However, there are many capabilities of biological systems that are not feasible to mimic using the available technology. In this paper, the state-of-the-art of some of the developed biomimetic capabilities, potentials and challenges will be reviewed.

• Journal of Korean Society for Quality Management
• /
• v.27 no.1
• /
• pp.1-17
• /
• 1999

To satisfy the needs of customers, firms must supply customers with products of high quality. This requires firms establish a quality management system which pursues customer satisfaction in a business strategy. Quality management must be connected with the strategic chain and the firm can obtain excellent performances only when top management leadership which places people over profit is exercised. The purpose of this study is to analyse whether elements of strategic quality management has any effect on quality and business performances. A questionnaire was used for the survey. In this study, it is showed that elements of strategic quality management(strategy, leadership, customer satisfaction, quality improvement activity, technological innovation, shop floor management, employee participation) are positively correlated with the quality and business performances. This tells firms have to carry out the strategic quality management effectively based on the strategic chain and emphasizing leadership.

• Kyungpook Mathematical Journal
• /
• v.60 no.1
• /
• pp.45-51
• /
• 2020

A module M is called FI-extending if every fully invariant submodule of M is essential in a direct summand of M. In this work, we define a module M to be generalized FI-extending (GFI-extending) if for any fully invariant submodule N of M, there exists a direct summand D of M such that N ≤ D and that D/N is singular. The classes of FI-extending modules and singular modules are properly contained in the class of GFI-extending modules. We first develop basic properties of this newly defined class of modules in the general module setting. Then, the GFI-extending property is shown to carry over to matrix rings. Finally, we show that the class of GFI-extending modules is closed under direct sums but not under direct summands. However, it is proved that direct summands are GFI-extending under certain restrictions.