• Proceedings of the Korea Society for Simulation Conference
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• 1999.10a
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• pp.121-126
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• 1999

지능망은 소비자 또는 가입자의 다양한 욕구를 신속하고도 효과적으로 제공하며 동시에 새로운 서비스에 대한 수요가 있을 경우에 이에 쉽게 대처할 수 있는 차세대 통신망이다. FEP-BEP 구조를 갖는 (N+1) 형식의 지능망 서비스 시스템에서의 서비스에 대한 부하균형 방법으로 각 SCP-BEP 시스템별로 서비스의 종류에 따라서 부하를 할당하는 방식이 있으며, 이를 국내 통신회사에서 실제로 적용하고 있다. 이러한 방식의 장점은 부하균형을 동적으로 할당할 수 있고, 신규 서비스의 등록이나 기존 서비스의 갱신시에 기존에 제공하던 서비스에 대한 호에 미치는 영향을 최소화 할 수 있다는데 있다. 본 논문에서는 SCP-BEP에 제공하는 서비스별로 할당하는 부하량에 따른 시스템의 성능추이를 시뮬레이션 기법에 의하여 추적하고 그 결과에 대하여 기술한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.10
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• pp.3983-4001
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• 2015

Exact average bit error probability (BEP) expressions for mobile-relay-based mobile-to-mobile (M2M) cooperative networks with incremental decode-and-forward (IDF) relaying over N-Nakagami fading channels are derived in this paper. The average BEP performance under different conditions is evaluated numerically to confirm the accuracy of the analysis. Results are presented which show that the fading coefficient, the number of cascaded components, the relative geometrical gain, and the power allocation parameter have a significant influence on the average BEP performance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.18 no.4
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• pp.1075-1089
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• 2024

In this paper, the optimizations of multi-hop cooperative molecular communication (CMC) system in cylindrical anomalous-diffusive channel in three-dimensional enviroment are investigated. First, we derive the performance of bit error probability (BEP) of CMC system under decode-and-forward relay strategy. Then for achieving minimum average BEP, the optimization variables are detection thresholds at cooperative nodes and destination node, and the corresponding optimization problem is formulated. Furthermore, we use conjugate gradient (CG) algorithm to solve this optimization problem to search optimal detection thresholds. The numerical results show the optimal detection thresholds can be obtained by CG algorithm, which has good convergence behaviors with fewer iterations to achieve minimized average BEP compared with gradient decent algorithm and Bisection method which are used in molecular communication.

• 전자공학회논문지 IE
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• v.48 no.2
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• pp.26-31
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• 2011

In this paper we show the LCD simulator for defect inspection using image processing algorithm and neural network. The defect inspection algorithm of the LCD consists of preprocessing, feature extraction and defect classification. Preprocess removes noise from LCD image, using morphology operator and neural network is used for the defect classification. Sample images with scratch, pinhole, and spot from real LCD color filter image are used. From some experiments results, the proposed algorithms show that defect detected and classified in the ratio of 92.3% and 94.5 respectively. Accordingly, in this paper, a possibility of practical implementation of the LCD defect inspection system is finally suggested.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.4
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• pp.1373-1391
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• 2022

We investigate mobile multiple-input multiple-output (MIMO) molecular communication via diffusion (MCvD) system which is consisted of two source nodes, two destination nodes and one relay node in the mobile three-dimensional channel. First, the combinations of decode-and-forward (DF) relaying protocol and network coding (NC) scheme are implemented at relay node. The adaptive thresholds at relay node and destination nodes can be obtained by maximum a posteriori (MAP) probability detection method. Then the mathematical expressions of the average bit error probability (BEP) of this mobile MIMO MCvD system based on DF and NC scheme are derived. Furthermore, in order to minimize the average BEP, we establish the optimization problem with optimization variables which include the ratio of the number of emitted molecules at two source nodes and the initial position of relay node. We put forward an iterative scheme based on block coordinate descent algorithm which can be used to solve the optimization problem and get optimal values of the optimization variables simultaneously. Finally, the numerical results reveal that the proposed iterative method has good convergence behavior. The average BEP performance of this system can be improved by performing the joint optimizations.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1990.06a
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• pp.702-704
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• 1990

• The Transactions of the Korea Information Processing Society
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• v.3 no.1
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• pp.181-190
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• 1996

Pipelined architecture improves processor performance by overlapping the execution of several different instructions. The effect of control hazard stalls the pipeline and reduces processor performance. In order to reduce the effect of control hazard caused by branch, we proposes a new approach combining both branch prediction and two paths strategy. In addition, we verify the performance improvement in a proposed approach by utilizing system performance metric CPI rather than BEP.

• Journal of Communications and Networks
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• v.12 no.6
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• pp.616-623
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• 2010

In this paper, exact closed-form expressions for outage probability and bit error probability (BEP) are presented for multi-hop decode-and-forward (DF) relaying schemes in conjunction with cooperative diversity, in which selection combining technique is employed at each node. We have shown that the proposed protocol offers remarkable diversity advantage over direct transmission as well as the conventional DF relaying schemes with the same combining technique. We then investigate the system performance when different diversity schemes are employed. It has been observed that the system performance loss due to selection combining relative to maximal ratio combining is not significant. Simulations are performed to confirm our theoretical analysis.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.261-264
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• 2003

본 연구는 바이그램을 이용하여 자동문서범주화 성능을 향상시키는 알고리즘의 개발을 목표로 한다. 기존의 문서 범주화 알고리즘의 장단점을 비교하여 개선된 바이그램 추출 알고리즘을 구현하고, 이 알고리즘을 실험한 결과 Reuters-21579 data set은 개별 단어를 사용하여 시험한 결과보다 단어+바이그램을 사용하였을 경우 BEP은 2.07%, F1은 1.40% 향상률을 보였고, Korea-web data set은 BEP의 8.12%, F1의 6.25% 향상을 보였다. 이와 같은 실험결과는 단어를 사용한 경우보다 단어+바이그램을 사용한 자동문서 범주화 시스템이 더 효율적이라는 것을 보여준다.

• Journal of the Korea Safety Management & Science
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• v.15 no.4
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• pp.435-448
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• 2013

The aim of this study is to investigate and develop the extended models for Economic Cash Amount(ECA), Cash Break Even-Point(BEP), and Cash Flow Statement(CFS) by referencing systematic literature review in the field. The study develops three extended models to determine the optimal cash amount: ECA model with interest opportunity cost, financing transaction cost and financing fail cost, ECA model with daily cash supply and interest opportunity cost, ECA model with financing fail cost and interest opportunity cost. Earnings Before Interests, Tax, Depreciation and Amortization(EBITDA) is obtained by subtracting noncash depreciation costs from Earning Before Interest and Tax(EBIT), which is efficient metric to evaluate operating cash flow. The research also develops two extended Cash BEP models, considered as interest and corporate tax, in order to indentify the break-even point as EBITDA equals zero. Furthermore, this paper proposes the modified version of CFS by introducing the reclassification of operating and financing accounts in the statement of financial position. In addition, the study also present the reclassification of five types of profit, such as gross profit, EBIT, ordinary profit, special profit, and net profit within the statement of comprehensive income. In order to provide a better understanding of the proposed cash flow models, numerical examples, such as two-sample t test and Analysis of Variance(ANOVA), are presented to demonstrate the statistical significance according to the industrial types for net working capital(i.e cash-to-cash), net profit, operating cash flow and free cash flow.