• Journal of KIISE
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• v.44 no.12
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• pp.1252-1257
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• 2017

In dialogues, speakers' intentions can be represented by sets of an emotion, a speech act, and a predicator. Therefore, dialogue systems should capture and process these implied characteristics of utterances. Many previous studies have considered such determination as independent classification problems, but others have showed them to be associated with each other. In this paper, we propose an integrated model that simultaneously determines emotions, speech acts, and predicators using a convolution neural network. The proposed model consists of a particular abstraction layer, mutually independent informations of these characteristics are abstracted. In the shared abstraction layer, combinations of the independent information is abstracted. During training, errors of emotions, errors of speech acts, and errors of predicators are partially back-propagated through the layers. In the experiments, the proposed integrated model showed better performances (2%p in emotion determination, 11%p in speech act determination, and 3%p in predicator determination) than independent determination models.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.2 s.58
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• pp.28-37
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• 2006

전파 자원은 국가의 무형 자산으로서 자원이 한정되어 있는 반면에 이에 대한 수요가 급증하면서 전파 자원의 가치가 점점 높아지고 있다. 특히 국내의 경우 IT839 전략으로 추진 중인 WiBro(Wireless Broadband), DMB(Digital Multimedia Broadcasting), Home Network, Telematics(Telecommunication Informatics), WCDMA(Wide Code Division Multiple Access), RFID/USN(Radio Frequency Identification/Ubiquitous Sensor Network) 등 무선 주파수를 이용하는 새로운 서비스가 증가하면서 주파수 자원에 대한 중요성은 더욱 강조되고 있다. 종래의 전파 정책이 정부가 정책을 세우고 이를 관리하는 Command-and-Control 위주였다면, 향후의 전파 정책은 OpYN1020en Spectrum 정책으로 전환될 것으로 전망된다. 본 고에서는 전파 자원의 효율적인 이용을 도모하는 일반적인 CR(Cognitive Radio) 기술에 대하여 언급하고, 이를 이동성이 없는 고정 환경에 적용하기 위한 IEEE 802.22 WRAN 시스템의 물리계층 전송 규격 사양, 프레임구조 및 현재 논의되고 있는 기술에 대하여 논의한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.8
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• pp.690-698
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• 2015

In this paper, we propose a policy orientation for human effects on EMF according to the increasing number of devices which use electromagnetic waves. In particular, we conducted the analysis of the concept of the precautionary principle in advanced foreign countries and case studies which are being applied to the criteria more strict than international standards of protection for vulnerable groups. Futhermore, we analyzed the regulations of the EMF safety zone on KynungGi-Do Regional Council which is not valid in terms of constitutional principles such as superior constitutional and rerservations law principles. In conclusion, we propose to amend or modify any law for vulnerable groups and to implement the EMF-related policy on based Radio Wave Act.

• Journal of KIISE:Information Networking
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• v.30 no.6
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• pp.755-763
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• 2003

To improve performance over noisy wireless channels, mobile wireless networks employ forward error correction(FEC) techniques. The performance of static FEC algorithms, however, degrades by poorly matching the overhead of their correction code to the degree of the fluctuating underlying channel error. This paper proposes an adaptive FEC technique called FECA(FEC-level Adaptation), which dynamically tunes FEC strength to the currently estimated channel error rate at the data link layer. FECA is suitable for wireless networks whose error rate is high and slowly changing compared to the round-trip time between two communicating nodes. One such example network would be a sensor network in which the average bit error rate is higher than $10^{-6}$ and the detected error rate at one time lasts a few hundred milliseconds on average. Our experiments show that FECA performs 15% in simulations with theoretically modeled wireless channels and in trace-driven simulations based on the data collected from real sensor networks better than any other static FEC algorithms.

• The Journal of the Acoustical Society of Korea
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• v.22 no.7
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• pp.579-584
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• 2003

All of propagation path loss prediction models, which have been presented up to date, are oかy for ground living space. In reality, sea surface free space is different from ground living space in physical hierarchical structure. If the propagation path prediction model for ground living space is applied to the sea surface free space, propagation path loss will be smaller than actual value, while the maximum service straight line will become shorter. Thus this paper proposed and simulated the propagation path loss prediction model for predicting propagation path loss more accurately in sea surface free space, with its focus on CDMA mobile communication frequency band. Then the simulation results were compared to actual survey to verify its practicality.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.7
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• pp.588-598
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• 2016

In this paper, we studied a policy direction for promoting radio industry by analyzing the ecosystem. For this, we drew the growing structure and mechanism of radio industries according to wireless technology and service development. We suggested policy elements for radio industry promotion, which is composed of technology development, service development, advancement of law and regulations, business model development, assistance of production and use, publicity enforcement for promotion. The concept and radio industry sector practices of the ecosystem analysis are analyzed by survey of experts. From this result, the 5 policy options are proposed.

• Journal of KIISE:Software and Applications
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• v.28 no.9
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• pp.603-611
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• 2001

This paper proposes a novel fast layer-by-layer algorithm that has better generalization capability. In the proposed algorithm, the weights of the hidden layer are updated by the target vector of the hidden layer obtained by least squares method. The proposed algorithm improves the learning speed that can occur due to the small magnitude of the gradient vector in the hidden layer. This algorithm was tested in a handwritten digits recognition problem. The learning speed of the proposed algorithm was faster than those of error back propagation algorithm and modified error function algorithm, and similar to those of Ooyen's method and layer-by-layer algorithm. Moreover, the simulation results showed that the proposed algorithm had the best generalization capability among them regardless of the number of hidden nodes. The proposed algorithm has the advantages of the learning speed of layer-by-layer algorithm and the generalization capability of error back propagation algorithm and modified error function algorithm.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.28-30
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• 2003

COMA셀룰라 시스템의 용량은 간섭의 양에 따라 결정되므로 이 간섭량을 정확히 계산해야 시스템 성능 평가를 정확히 할 수 있다. 본 논문은 COMA셀룰라 시스템의 역방향 타셀 간섭량을 계산하기 위해 Riemann-Zeta 함수를 이용하여 임의의 전파 감쇄 지수에도 적용할 수 있는 근사식을 제시하고 시abf레이션 결과와 비교하여 그 효용을 살펴 보았다. 제안된 근사식을 이용해 계산한 시스템 용량 상한식은 시뮬레이션을 통해 얻은 용량과 근사한 결과를 얻을 수 있었다. 제안된 타셀 간섭 근사식은 복합적인 전파 환경이 고려되어야 할 계층셀 시스템에서의 간섭 일 용량 계산과 알고리즘 검증에 유용하게 사용될 수 있을 것으로 생각된다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.5
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• pp.1044-1051
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• 2003

This paper surveys the EBP(Error Back Propagation) learning, the Cross Entropy function and the LBL(Layer By Layer) learning, which are used for learning the MLP(Multi Layer Perceptrons). We compare the merits and demerits of each learning method in the handwritten digit recognition. Although the speed of EBP learning is slower than other learning methods in the initial learning process, its generalization capability is better. Also, the speed of Cross Entropy function that makes up for the weak points of EBP learning is faster than that of EBP learning. But its generalization capability is worse because the error signal of the output layer trains the target vector linearly. The speed of LBL learning is the fastest speed among the other learning methods in the initial learning process. However, it can't train for more after a certain time, it has the lowest generalization capability. Therefore, this paper proposes the standard of selecting the learning method when we apply the MLP.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.7
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• pp.1037-1047
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• 2001

In this paper, the capacity for the reverse link of the imperfect power controlled DS/CDMA hierarchical cellular system is analyzed considering imperfect sectorization in shadowing environment. Unlike the theoretical assumption, the power control of the DS/CDMA hierarchical cellular system is not perfect. Therefore, we consider various parameters such as the imperfect power control, the imperfect sectorization, the processing gain and the number of microcell interferers, which cause the capacity variation of the DS/CDMA hierarchical cellular system. It is shown that the capacity of DS/CDMA hierarchical cellular system is decreased according to the increase of the deviation of the imperfect power control, the overlapped angle, the power ratio between macrocell and microcell and to the decrease of processing gain, the number of microcell interfering users. Also, it is observed that the hierarchical cellular system can increase the user capacity from 1.54 to 3.89 times compared to the homogeneous macro-cellular system.