• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.31 no.11C
• /
• pp.1085-1091
• /
• 2006

The major goal of this paper is to develop a practically implemental radial basis function (RBF) neural network based multi-user detector (MUD) for direct sequence (DS)-CDMA system. This work is expected to provide an efficient solution for RBF based MUD by quickly setting up the proper number of RBF centers and their locations required in training. The basic idea in this research is to estimate all the possible RBF centers by using supervised ${\kappa-means$ clustering technique, and select the only centers which locate near seemingly decision boundary between centers, and reduce further by grouping the some of centers adjacent each other. Therefore, it reduces the computational burden for finding the proper number of RBF centers and their locations in the existing RBF based MUD, and ultimately, make its implementation practical.

• Proceedings of the KOSOMBE Conference
• /
• v.1997 no.11
• /
• pp.361-364
• /
• 1997

Bayesian MAP-EM approaches have been quite useful or tomographic reconstruction in that they can stabilize the instability of well-known ML-EM approaches, and can incorporate a priori information on the underlying emission object. However, MAP reconstruction algorithms with expressive priors often suffer from the optimization problem when their objective unctions are nonquadratic. In our previous work [1], we showed that the use of deterministic annealing method greatly reduces computational burden or optimization and provides a good solution or nonquadratic objective unctions. Here, we further investigate the convergence of the deterministic annealing algorithm; our experimental results show that, while the solutions obtained by a simple quenching algorithm depend on the initial conditions, the estimates converged via deterministic annealing algorithm are consistent under various initial conditions.

• Journal of Engineering Education Research
• /
• v.14 no.4
• /
• pp.62-68
• /
• 2011

Many engineering schools in Korea implement ABEEK programs. One of the core parts of ABEEK is accreditation criterion 2, the program outcomes and their appraisal. This paper tries to discuss the program outcomes and to study the impact of applying the program outcomes to one of the graduation requirements. We show simple survey results for implementing ABEEK programs concerning the program outcomes and their relation to graduation requirements. If the program outcomes are used as one of the graduation requirements, some graduates may satisfy the average grade point for graduation requirements but can not meet the program outcome criteria satisfied by other than regular classes. In this case, the graduate may have trouble to try to meet the program outcome criteria, since he may not be able to stay in school without taking classes. The problems of setting the levels of program outcomes as graduation requirements, non classwork related program outcomes, and work burden to professors should be also prudently reviewed for successful ABEEK implementation.

• Journal of Information Management
• /
• v.29 no.3
• /
• pp.43-62
• /
• 1998

This study examines the way of making use of the science journals sharing with many users, who even do not work for the same institute. It may help to make the information as much as available with minimum financial burden to users. This is needed expecially when we recognize the fact that the amount of information supply is being increased rapidly while the financial environments around us are becoming aggravated.

• Korean Journal of Health Education and Promotion
• /
• v.14 no.2
• /
• pp.1-16
• /
• 1997

Recently obesity which had not been at issue very much before comes to the fore as an important health problem. But women frequently attempt excessive weight controls not to cure obesity but to fit false norms of women's appearances. Both these trends and tendencies of perceiving themselves to be fatter than what thay are work as a kind of stressor which impose psychological burden on most women, and finally threaten their mental health. In this point, the purpose of this study was to analize the factors having an effect on women's weight-related stress. This study included a survey and obese level measurement of a systematic random samples of 431 E. University senior students for 17 days(from 13 May 1996 to 29 May 1996). As results, obese level, especially the subject's evaluation for her obese level, history of weight control, and strong weigh control beliefs that the success depends on herself influenced stress.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.19 no.1
• /
• pp.150-160
• /
• 1995

The practical design and construction of a Stewart Platform-based unilateral universal hand-controller is presented. It is also presented that such a design concept could be implemented by developing a technical method of determining the forward kinematics of a Stewart Platform in real time. In this work, the forward kinematics of a Stewart Platform has been determined in real time using three additional displacement sensors which eliminate the computational burden of solving the forward kinematics described in nonlinear simultaneous equations. The workspace of the Stewart Platform via inverse kinematics has been analyzed numerically and used as a design guide for the determination of the mechanism dimensions such as the sizes of the upper and base platforms and the minimum and maximum lengths of the legs. The hardware of the hand-controller has been constructed and tested to demonstrate the feasibility of the design concept.

• Communications for Statistical Applications and Methods
• /
• v.20 no.3
• /
• pp.217-223
• /
• 2013

Two influence diagnostic methods for the common mean model are proposed. First, an investigation of the influence of observations according to minor perturbations of the common mean model is made by adapting the local influence method which is based on the likelihood displacement. It is well known that the maximum likelihood estimates are in general sensitive to influential observations. Case-deletions can be a candidate for detecting influential observations. However, the maximum likelihood estimators are iteratively computed and therefore case-deletions involve an enormous amount of computations. An approximation by Newton's method to the maximum likelihood estimator obtained after a single observation was deleted can reduce much of computational burden, which will be treated in this work. A numerical example is given for illustration and it shows that the proposed diagnostic methods can be useful tools.

• Journal of the Korea Safety Management & Science
• /
• v.7 no.1
• /
• pp.11-23
• /
• 2005

It is difficult to put it into practice in that it requires bearing too much burden to draw out the planning itself in a case of large construction work. Consequently in this paper we select evaluation criteria by construction progress, classify into several categories, and regard potential danger which often occurs, as a evaluation criterion. Further step is to allow workers or collaborated companies to express their expert opinions or experiences and to encourage quality and process control and autonomous safety control by applying PSM(Process Safety Management) method using AHP(Analytic Hierarchy Process) and to development of PSIM(Process Safety Information Management) evaluation method in the construction. The reason why PSIM method should be quantitative and substantial progress is because it contributes Korean constructing companies to enhancing their safety control ability and to taking an equal stance just like developed countries, thereby strengthening their competitive edges.

• Proceedings of the Culinary Society of Korean Academy Conference
• /
• 2006.08a
• /
• pp.5-20
• /
• 2006

The purpose of this study is to understand how to activate field training internships through former researches relation to training internships thesis. The concept of field training is the same as work experience education. Students have experienced the skills of a practical job in the tourism industry. And also could enhance acquisition of professional theories. According to domestic former researches, The students participated in hotel field practice hardly satisfied with internships because unreasonable duties, burden and circumstances regardless of efficiency of school curriculum. And also they are showing dissatisfaction with compensation. However, Foreign study only on focus on communication between hotel and school. Finally, In order to activate industrial field training internships, School and hotel have more delicate harmonization to improve training internships problem.

• Progress in Superconductivity and Cryogenics
• /
• v.13 no.4
• /
• pp.14-17
• /
• 2011

The evaluation of the electromechanical properties of HTS CC tapes is one of the foremost procedures to be done to ensure the applicability of superconducting wires to electric devices. A precise measurement of the stress and strain is important in deriving the mechanical properties under operating environment. Up to now, there is no standard test method yet for the electromechanical property evaluation of HTS tapes under self field and external magnetic field although there are already reports on the different devices used to evaluate these properties. Strain can be measured by adopting a strain gauge or a high resolution double extensometer. In this study, strain effect on $I_c$ in HTS CC tapes under magnetic fields was evaluated. Comparison of advantages and setback of strain measuring devices were discussed. In addition, a dual strain measurement system using both the SG and extensometer may be practical to lessen the burden in case one of the measuring devices does not work well.