• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.1029-1032
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• 1993

The construction of the rulebase of a fuzzy controller is usually difficult because experts' knowledge is often hard to derive. To remedy such a problem, a number of self-learning schemes for rulebase formulations were proposed. One of the popular approaches is the reinforcement learning. Many successful examples employing such an idea were proposed and claimed to be with good results in the literature. The purpose of this paper is to discuss and make comparisons between some of the related work in order to provide a better picture regarding their performances. A numerical algorithm for the analysis of nonlinear as well as fuzzy dynamic systems, the Cell-to-Cell Mapping, is used. The analytical results reveals the true behavior of the learning schemes.

• Journal of Communications and Networks
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• v.6 no.2
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• pp.133-146
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• 2004

Recently, many active queue management (AQM) algorithms have been proposed to address the performance degradation. of end-to-end congestion control under tail-drop (TD) queue management at Internet routers. However, these AQM algorithms show performance improvement only for limited network environments, and are insensitive to dynamically changing network situations. In this paper, we propose an adaptive queue management algorithm, called PID-controller, that uses proportional-integral-derivative (PID) feedback control to remedy these weak-Dalles of existing AQM proposals. The PID-controller is able to detect and control congestion adaptively and proactively to dynamically changing network environments using incipient as well as current congestion indications. A simulation study over a wide range of IP traffic conditions shows that PID-controller outperforms other AQM algorithms such as Random Early Detection (RED) [3] and Proportional-Integral (PI) controller [9] in terms of queue length dynamics, packet loss rates, and link utilization.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.11
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• pp.1464-1471
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• 1999

This paper introduces complex-valued competitive learning neural network for spatio-temporal pattern recognition. There have been quite a few neural networks for spatio-temporal pattern recognition. Among them, recurrent neural network, TDNN, and avalanche model are acknowledged as standard neural network paradigms for spatio-temporal pattern recognition. Recurrent neural network has complicated learning rules and does not guarantee convergence to global minima. TDNN requires too many neurons, and can not be regarded to deal with spatio-temporal pattern basically. Grossberg's avalanche model is not able to distinguish long patterns, and has to be indicated which layer is to be used in learning. In order to remedy drawbacks of the above networks, unsupervised competitive learning using complex umber is proposed. Suggested neural network also features simultaneous recognition, time-shift invariant recognition, stable categorizing, and learning rate modulation. The network is evaluated by computer simulation with randomly generated patterns.

• Corrugated packaging logistics
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• s.64
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• pp.81-89
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• 2005

이 가이드는 골판지포장산업 현장 전문가 및 골판지포장산업 관련 업체들의 도움으로 만들어졌으며, 골판지 생산 현장에서 나타나는 불량 및 문제들을 크게 네 부분 - 제판 시 문제, 인쇄 시 문제, 타발공정 상 문제, 완정공정 및 상자 봉합 시 문제 등으로 나누어 각각의 원인과 대책을 설명하였다. 또한 이 가이드는 골판지 제조 공정에서 나타나는 문제(불량원인)등에 대한 명명, 정의 그리고 그 대책을 위한 기본적인 지식을 제공할 것이다. 그러나 현 골판지 제조 공정의 모든 문제점을 이 가이드에서 제공되는 방법으로 모두 해결할 수는 없을 것이다. 다만 이러한 정보를 바탕으로 더욱 완벽한 지식 및 기술의 축적이 이루어지고 그것이 널리 퍼져서 전체 골판지 포장산업 발전의 밑거름이 되고자 한다. 이 가이드는 TAPPI에서 출판한 Corrugating Defect / Remedy Manual(6판)을 KT&G 중앙 연구원인 성용주 박사가 맡아 번역할 예정이며 번역이 완료되는 대로 TAPPI와 저작권 문제를 협의하여 단행본으로 출판할 예정이다. 따라서 골판지포장관련 종사자들의 관심과 애정 어린 충고를 부탁 드리며, 조금이나마 골판지포장산업의 진일보된 기술의 발전이 있기를 기대해 본다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.5
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• pp.690-695
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• 2014

This paper presents a modified CCI image interpolation method based on the even-odd decomposition (EOD). The CCI method is a well-known technique to interpolate images. Although the method provides better image quality than the linear interpolation, its complexity still is a problem. To remedy the problem, this paper introduces analysis on the EOD decomposition of CCI and then proposes a reduced CCI interpolation in terms of complexity, providing better image quality in terms of PSNR. To evaluate the proposed method, we conduct experiments and complexity comparison. The results indicate that our method do not only outperforms the existing methods by up to 43% in terms of MSE but also requires low-complexity with 37% less computing time than the CCI method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6A
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• pp.910-917
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• 2000

Because the random early detection(RED) algorithm deals all flows with the same best-effort traffic characteristic, it can not correctly control the output link bandwidth for the flows with different traffic characteristics. To remedy this problem, several per-flow algorithms have been proposed. In this paper, we propose a new per-flow type Fair Droptail algorithm which can fairly allocate bandwidth among flows over a shared output link. By evenly allocating buffers per flow, the Fair Droptail can restrict a flow not to use more bandwidth than others. In addition, it can be simply implemented even if it employs the per-flow state mechanism, because the Fair Droptail only keeps each information of flow in active state.

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.305-308
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• 2008

This paper describes a research study on the durability and strength properties of thin quiet-permeable asphalt concrete. Such asphalt mixes have high porosity, which offers significantly better drainages than normal mix designs. However, these materials also exhibit poor durability and strength limiting their use in pavement application. To remedy this, fiber and polymer modifiers have been proposed. All samples were added to modified binder which were prepared with or without the modifiers and fiber using Marshall mix procedures and were experimentally tested using various standardized testing procedures including percent air void for porosity, cantabro test and marshall stability. In general, the results of marshall stability showed that modified mixtures were equivalent to unmodified mixtures. Especially, the result of cantabro tested modified mixtures was superior to unmodified mixtures.

• Journal of Information Processing Systems
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• v.11 no.4
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• pp.495-508
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• 2015

In this paper, a novel robust medical images watermarking scheme is proposed. In traditional methods, the added watermark may alter the host medical image in an irreversible manner and may mask subtle details. Consequently, we propose a method for medical image copyright protection that may remedy this problem by embedding the watermark without modifying the original host image. The proposed method is based on the visual cryptography concept and the dominant blocks of wavelet coefficients. The logic in using the blocks dominants map is that local features, such as contours or edges, are unique to each image. The experimental results show that the proposed method can withstand several image processing attacks such as cropping, filtering, compression, etc.

• Korean Journal of Pharmacognosy
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• v.42 no.3
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• pp.213-217
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• 2011

Platycodon grandiflorum (Campanulaceae) is listed in Shin-Nong-Bon-Cho-Kyung (神農本草經) as the remedy for ventilation the lung, resolving phlegm, promoting pus discharge and subduing carbuncles. The prescriptions of Gil-Gyung-Tang (桔梗湯) are also recorded in many other Chinese medicinal books. The identification of the cultivation year of P. grandiflorum is very important in commercial market as well as in research field. However, any reports about it have not been clearly established yet. To clarify the criterion, the morphological and anatomical characteristics of the roots of P. grandiflorum cultivated in Korea for various years were studied. The characteristics of the cork layer, latex tube, and vessels were shown to be useful keys to confirm the cultivation year of P. grandiflorm. As a result, it was clarified that Kilkyung from Korea was the two years root of Platycodon grandiflorm.

• Korean Journal of Pharmacognosy
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• v.35 no.1 s.136
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• pp.45-51
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• 2004

Panax ginseng C. A. Meyer (Araliaceae) is listed in Shen Nung Pentsao Ching(神農本草經) as the remedy for replenishing the primodial qi(氣), restoring pulse, treating collapse, tonifing the spleen and lag, promoting the production of body fluid to quench thirst, tranquilizing the mind, and improving the function of brain. The prescriptions of In Sam Tang(人參揚) are also recorded in many other Chinese medical books. The identification of the age of Panax ginseng is very important in commercial market as well as in research field. However, any reports about it have not been clearly established yet. To clarify the criterion, the morphological and anatomical characteristics of the roots of various age Panax ginseng cultivated in Korea were studied. The characteristics of cork layer, secretory canal, and vessel were shown to bε useful keys to confirm the age of Panax ginseng.