• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.1
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• pp.251-268
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• 1996

In this paper, a higher-order feedforward neural network called ridge polynomial network (RPN) which shows good approximation capability for nonlnear continuous functions defined on compact subsets in multi-dimensional Euclidean spaces, is presented. This network provides more efficient and regular structure as compared to ordinary higher-order feedforward networks based on Gabor-Kolmogrov polynomial expansions, while maintating their fast learning property. the ridge polynomial network is a generalization of the pi-sigma network (PSN) and uses a specialform of ridge polynomials. It is shown that any multivariate polynomial can be exactly represented in this form, and thus realized by a RPN. The approximation capability of the RPNs for arbitrary continuous functions is shown by this representation theorem and the classical weierstrass polynomial approximation theorem. The RPN provides a natural mechanism for incremental function approximation based on learning algorithm of the PSN. Simulation results on several applications such as multivariate function approximation and pattern classification assert nonlinear approximation capability of the RPN.

• Annals of Clinical Neurophysiology
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• v.12 no.1
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• pp.1-2
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• 2010

Chronic non-specific low back pain (CLBP) is one of the major health problems casting substantial amount of economic expenses and negative impact on quality of life onto an individual as well as society. On contrary to public familiarity, the ways of management of CLBP are diverse and there is yet no general consensus about which approach is better than others or to whom the specific management should be applied. Some hold the negative point of view on the efficacy of the invasive maneuver such as epidural injection because there is no controlled clinical trial (RCT) yielding better long term outcome of those invasive managements over conservative ones. But the experts of interventional or surgical treatment stress the methodological difficulty in performing RCT and assert that those invasive treatments can bring the prompt and complete resolution of low back pain and restoration of function in appropriately selected cases. These seemingly opposite views on the invasive management on CLBP are rather complimentary each other than to be contradictory.

• Proceedings of the KSPS conference
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• 1996.02a
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• pp.23-40
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• 1996

The communicative disorders in cleft palate patients have relationship with the acoustic and He physiological phenomena. Particularily hypernasality is a parameter of cleft palate speech that has been studied by many clinicians and speech pathologists. The degree of hypernasality has been assessed by the listener,s judgement, but perceptual assessements have poor scientific reliability, so objective instruments have been needed to test hypernasality with diagnostics accuracy. This study was analyzed the nasalance score using a Nasometer for cleft palate patients. The simple vowels /a/, /i/, /e/ and the approximants /j/, /w/ were tested for the degree of hypernasality after operation. The phrases containing long and short duration times were used in this study to asses hypeernasality. Fiberopic views shows the open velopharyngeal port that resulted in hypernasality of cleft palate patients. The authors assert the important of the management of cleft palate patients.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.21 no.2
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• pp.224-234
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• 1997

It was demonstrated earlier that for laminar, isothermal flow of the lubricant in long journal bearings, inertia has negligible effect on the load carrying capacity and influences only the stability characteristics of the bearing. The question in the present paper is: 'will these conclusions of the isothermal theory remain valid in the presence of significant dissipation, or will lubricant inertia and dissipation interact non-linearly to bring about qualitative changes in bearing performance\ulcorner' The results obtained here assert that the effect of lubricant inertia on load carrying capacity remains negligible, irrespective of the rate of dissipation. The stability of the bearing is, however, affected by lubricant inertia. These results, although obtained here for long bearings with Sommerfeld and Gumbel boundary conditions, are believed to be applicable to practical bearing operations and affirm that bearing load may be calculated from classical, i. e., non-inertial theory.

• Journal for History of Mathematics
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• v.17 no.1
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• pp.33-42
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• 2004

In this paper, we identify the essential ideas of Fundamental Theorem of Arithmetic(FTA). Then, we compare these ideas with several theorems of Euclid's Elements to investigate whether the essential ideas of FTA are contained in Elements or not. From this, we have the following conclusion: Even though Elements doesn't contain FTA explicitly, it contains all of the essential ideas of FTA. Finally, we assert two reasons why Greeks couldn't mention FTA explicitly. First, they oriented geometrically, and so they understood the concept of 'divide' as 'metric'. So they might have difficulty to find the divisor of the given number and the divisor of the divisor continuously. Second, they have limit to use notation in Mathematics. So they couldn't represent the given composite number as multiplication of all of its prime divisors.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.279-282
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• 2007

Typically a wireless sensor network consists of a number of nodes that sense surrounding environment and collaboratively work to process and route the sensing data to a sink or gateway node. We propose an architecture with support of multiple routers in IPv6-based Low-power Wireless Personal Area Network (6LoWPAN). Our architecture provides traffic load balancing and increases network lifetime as well as self-healing mechanism so that in case of a router failure the network still can remain operational. Each router sends its own Router Advertisement message to nodes and all the nodes receiving the messages can select which router is the best router with the minimum hop-count and link information. We have implemented the architecture and assert our architecture helps in traffic load balancing and reducing data transmission delay for 6LoWPAN.

• Journal of the Korean Operations Research and Management Science Society
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• v.35 no.1
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• pp.1-17
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• 2010

This article addresses how an organization's customer relationship management (CRM) process affects customer equity drivers and, in turn, organizational performance. By raising a three-staged model including the CRM processes, customer equity drivers, and organizational performance, the authors assert that the customer equity drivers mediate between the CRM processes and organizational performance. The empirical analysis is based on a composite survey structure that gathers data from different types of informants according to the variables. Findings indicate that the expansion process has positive relationship with all the customer equity drivers. However, the acquisition process significantly influences both perceived value equity and brand equity, and the retention process significantly influences relationship equity only. In addition, the study shows that all the customer equity drivers influence the organizational performance given the existing customers. The relationship equity among the customer equity drivers has the strongest effect on the performance.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.8
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• pp.1075-1079
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• 2014

In this paper, we describe the analysis and the compensation method of the g-sensitivity error for MEMS vibratory gyroscopes. Usually, the g-sensitivity error has been ignored in the commercial MEMS gyroscope, but it deserves our attention to apply for the missile application as a tactical grade performance. Thus, it is necessary to compensate for the g-sensitivity error to reach a tactical grade performance. Generally, the g-sensitivity error seems intuitively to be a gyroscope bias error proportional to the linear acceleration. However, we assert that the g-sensitivity error mainly causes not a bias error but a scale-factor error. And we verify that the g-sensitivity scale-factor error occurs due to the non-linearity of parallel plate electrodes. Therefore, we propose the compensation method to remove the g-sensitivity scale-factor error. The experimental result showed that a proposed compensation method improved successfully the performance of the MEMS vibratory gyroscope.

• Journal for History of Mathematics
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• v.23 no.1
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• pp.67-78
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• 2010

This paper aims to show the role of mathematics in the age of disciplinary convergence. Classifying disciplinary convergence into three levels by its degree, I claim that mathematics can contribute to disciplinary convergence in three aspects: theoretical, linguistical, and spiritual. Then I assert that there is a corresponding relationship between three levels of convergence and three contributing aspects.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.357-360
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• 2003

본 논문에서는 Linux 운영체제에서의 kernel hardening을 설계 및 구현한다. 커널 내에서 panic 이 발생할 경우 복구가 가늠한 경우에는 정상적인 동작이 될 수 있도록 한다. 이렇게 함으로써 Linux Kernel Hardening 기능은 안정적인 커널의 동작을 보장한다. 본 논문에서 Lmux Kernel Hardening을 보장하기 위하여 커널 내 ASSERT() 함수를 중심으로 설계 및 구현을 한다.