• Environmental and Resource Economics Review
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• v.13 no.4
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• pp.657-684
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• 2004

This study is a theoretical bioeconomic analysis to analyze the effectiveness of Marine Protected Area (MPA) implemented in different stock spatial distributions: Closed System, Source-Sink System, and Density-dependent System. In the analysis, an economic impact of vessel activities is also included and a joint effectiveness of MPA and input control is investigated as well. Results of the analysis show that total fisheries stocks are increased in all systems. However, total harvests are decreased when MPA is implemented in the closed system and in the sink patch of source-sink system. On the contrary, total harvests are increased or decreased according to the rate of stock migration and the level of fisheries stocks in the source patch of source-sink system and in the density-dependent system. Specifically, total harvests are increased more significantly as the rate of migration increases and the level of stock increases higher. In addition, the increase in fishing efforts is restricted due to the increase in fishing cost. Therefore, fishing efforts could not be increased greatly in the fishable area. When input control is combined with MPA, the total stocks could be more increased.

• The Transactions of the Korea Information Processing Society
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• v.5 no.9
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• pp.2323-2333
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• 1998

Software engineers generally analyze the program behavior under the test case that revealed the error, not under any teneric est case. In this paper we discuss the dynamic slice consisting of all statements that actually affect the value of a variable occurrence for a given program input. We propose an efficient algorithm to make dynamic program slices. The eficiency of this algorithm is evaluated on some developed program. results are shown by a marking table of execution history. Dynamic Dependence Graph, and Reduced Dynamic Dependence Graph, Consequently, the efficiency of the proosed algorithm is also presented by the compariso with algorithm that was announced previously.

• Journal of Korean Society of Transportation
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• v.19 no.2
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• pp.61-72
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• 2001

기존의 링크교통량으로부터 OD추정모형은 기존 OD에 대한 추정의 종속성이 커, 기존 OD나 관측링크교통량의 오차에 따라 추정결과가 일관적이지 않은 문제점을 가지고 있다. 또한 관측링크교통량의 정확도가 중요함에도 불구하고 차종구분 없이 링크교통량을 이용하여 정보의 손실을 초래하였고 결과적으로 OD 추정력을 저하시켰다. 그렇지만 다차종 링크교통량으로부터 다차종 OD를 구하는 연구는 거의 없었으며, 그 추정결과가 단일차종에 대한 추정결과와 어떻게 다른지에 대한 연구도 전무하였다. 본 연구의 목적은 기존의 OD 추정모형이 기존 OD에 대해 종속성을 가지며 차종구분 없이 모형을 구성함으로써 추정력의 저하를 초래하였음을 밝히고, 이에 대한 대안으로 종속성 문제를 완화하고 차종구분을 통해 OD 추정모형의 추정력을 증진시키자 하는 것이다. 이를 위해 유전알고리즘을 이용한 다차종 OD행렬 추정모형(GAMUC)을 구축하고, 이를 기존의 바이레벨 모형의 IEA 알고리즘 및 다차종으로 확장한 모형(IEAMUC)과 게임이론측면에서 검토하였으며, 사례네트워크에 대해 각 기법을 비교하였다. 본 연구는 유전알고리즘을 이용한 OD 추정기법을 축도로에 적용한 임용택 등(2000)과 이를 네트워크로 확장한 백승걸 등(2000)의 연구를 다차종으로 확장한 것이다. 사례분석 결과 기존 OD의 오차변화나 관측링크교통량의 오차변화 등에 있어 GAMUC가 IEA나 IEAMUC보다 추정력이 양호하여, 실제 OD를 알 수 없는 도시부 네트워크에서 GAMUC 모형의 적용력이 우수하였다. 또한 차종을 구분하지 않은 기존 모형은 실제 OD와는 전혀 다른 OD 구조를 도출할 수 있음을 보였으며, 단일 차종을 여러 차종으로 구분하여 OD를 추정하는 것이 더 양호한 추정력을 확보하는 것으로 나타났다.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.1_2
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• pp.67-77
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• 2004

Value prediction is a technique to obtain performance gains by supplying earlier source values of its data dependent instructions using predicted value of a instruction. To fully exploit the potential of value speculation, however, the efficient recovery mechanism is necessary in case of value misprediction. In this paper, we propose a sequential and selective recovery mechanism for value misprediction. It searches data dependency chain of the mispredicted instruction sequentially without pipeline stalls and adverse impact on clock cycle time. In our scheme, only the dependent instructions on the predicted instruction is selectively squashed and reissued in case of value misprediction.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.143-151
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• 2011

Plaintext and key are independent in the existing block cipher. Also, encryption/decryption is performed by using structural features. Therefore, the external environment of suggested mixed cryptographic algorithm is identical with the existing ones, but internally, features of the existing block cipher were meant to be removed by making plaintext and key into dependent functions. Also, to decrease the loads on the authentication process, authentication add-on with dependent characteristic was included to increase the use of symmetric cryptographic algorithm. Through the simulation where the proposed cryptosystem was implemented in the chip level, we show that our system using the shorter key length than the length of the plaintext is two times faster than the existing systems.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.9
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• pp.55-59
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• 2013

A new method using RF Ids determined from measured S-parameters is proposed to extract the gate-voltage dependent effective carrier velocity of bulk MOSFETs in the saturation region without additional dc Ids measurement data suffering parasitic resistance effect that becomes larger with continuous down-scaling to sub-$0.1{\mu}m$. This method also allows us to extract the carrier velocity in the saturation region without the difficult extraction of bias-dependent parasitic gate-source capacitance and effective channel length. Using the RF technique, the electron velocity overshoot exceeding the bulk saturation velocity is observed in bulk N-MOSFETs with a polysilicon gate length of $0.065{\mu}m$.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.4
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• pp.739-743
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• 2006

In this paper, development of voice activated Universal Remote Control using the Neural Networks. A speaker dependent system is developed to operate for a single speaker. These systems are usually easier to develop, cheaper to buy and more accurate, but not as flexible as speaker adaptive or speaker independent systems. A speaker independent system is developed to operate for any speaker of a particular type (e.g. American English). These systems are the most difficult to develop, most expensive and accuracy is lower than speaker dependent systems. However, they are more flexible. A speaker adaptive system is developed to adapt its operation to the characteristics of new speakers. It's difficulty lies somewhere between speaker independent and speaker dependent systems. This paper is developed Speaker Adaptation using the Neural Networks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.4
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• pp.775-780
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• 2013

This paper proposes a speaker-dependent speech recognition algorithm which can classify the gender for male and female speakers in white noise and car noise, using a neural network. The proposed speech recognition algorithm is trained by the neural network to recognize the gender for male and female speakers, using LPC (Linear Predictive Coding) cepstrum coefficients. In the experiment results, the maximal improvement of total speech recognition rate is 96% for white noise and 88% for car noise, respectively, after trained a total of six neural networks. Finally, the proposed speech recognition algorithm is compared with the results of a conventional speech recognition algorithm in the background noisy environment.

• Journal of KIISE:Information Networking
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• v.37 no.6
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• pp.431-443
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• 2010

In this paper, we propose a range-free localization method that can improve the estimation accuracy of Approximate Point in Triangle(APIT), which is the representative localization method for low cost wireless sensor networks. Specifically, we propose extended-APIT(e-APIT) method, which minimizes the error in deciding whether an object is in an area formed by three beacons. We also propose a way to improve the localization by narrowing down the potential localization area using the signals from neighboring beacons. According to the simulation performed, the proposed e-APIT method demonstrated noticeable accuracy improvement over the conventional APIT method.

• The Transactions of the Korea Information Processing Society
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• v.6 no.2
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• pp.476-484
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• 1999

Many message logging and checkpointing schemes are proposed for fault tolerance in distributed systems in which nodes communicate by message passing. Most researches for recoverable distributed shared memory (DSM) also adopt similar schemes used in message passing systems. However, schemes used in message passing systems are not always appropriate to be directly used in DSM systems because the two systems, message passing systems and DSM systems, have different natures (function shipping and data shipping). Many modified schemes have been proposed for DSM systems to resolve these differences. In this paper, an object oriented approach is proposed for recoverable DSM. We present a new dependency tracking scheme between pages instead of processes. Based on this scheme, we propose new checkpointing and recovery schemes that can reduce overhead to make DSM recoverable.