• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.185-186
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• 2016

Maximum power point tracking (MPPT) techniques play a big role in improving the efficiency of photovoltaic (PV) system. Among various schemes, the incremental conductance (INC) method is mostly discussed in literature because of its fast response to the rapid irradiation changes and high tracking accuracy. However, the existing INC algorithm has trade-offs between fast dynamic response and steady state stability. This study proposes a novel INC method to meet high efficiency and fast tracking performance at the same time.

• Convergence Security Journal
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• v.1 no.1
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• pp.37-45
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• 2001

In this paper, separated and optimized pattern database model is proposed. In order to improve efficiency of Network-based IDS, pattern database is classified by proper basis. Classification basis is decided by the specific Intrusions validity on specific target. Using this model, IDS searches only valid patterns in pattern database on each captured packets. In result, IDS can reduce system resources for searching pattern database. So, IDS can analyze more packets on the network. In this paper, proper classification basis is proposed and pattern database classified by that basis is formed. And its performance is verified by experimental results.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1165-1166
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• 2011

본 논문에서는 대용량의 계통연계형 태양광발전시스템의 효율 개선을 위한 제어 알고리즘을 제안한다. 제안된 알고리즘은 태양전지로부터 생산되는 전체 전력량을 모니터링 하여 최대 효율 조건에서 동작할 수 있도록 구동시킬 인버터 수와 각 인버터가 담당할 전력량을 결정하고 이에 따른 태양전지의 직병렬 결합 조건이 가능하도록 태양전지의 배열을 릴레이 접점으로 재구성하는 방식이다. 제안된 알고리즘의 타당성 검증을 위해 LabVIEW 기반의 제어시스템을 구성하고 분석한다.

• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.160-161
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• 2005

A critical issue in implementing efficient Ethernet passive optical network(EPON) System is the bandwidth allocation algorithm. The overall goal of bandwidth allocation is to effectively and fairly perform scheduling of time slots between ONUs in EPON System. We propose a new algorithm of dynamic bandwidth allocation for improved bandwidth efficiency in EPON system.

• ETRI Journal
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• v.25 no.4
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• pp.211-218
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• 2003

This paper presents a dynamic resource allocation algorithm with multi-frequency time-division multiple access for the return link of interactive satellite multimedia networks such as digital video broadcasting return channel via satellite systems. The proposed timeslot assignment algorithm, called the very efficient dynamic timeslot assignment (VEDTA) algorithm, gives an optimal assignment plan within a very short period. The optimality and computational efficiency of this algorithm demonstrate that it will be useful in field applications.

• Proceedings of the Korea Society of Costume Conference
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• 2001.08a
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• pp.50-52
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• 2001

The main purpose of this study is to research ways for waste reduction in manufacturing, materials regeneration and clean production in apparel manufacturing in Taiwan, in order to achieve 3E: Efficiency, Economy and Environmental Protection. Specifically, this study hopes to address the following three areas: (1) To study the processing technologies which can turn apparel wastes to resources (2) To increase the efficiency in the use of energy and resources in apparel production (3) To establish a system for improving the recovery from unwanted apparel in Taiwan, in order to improve environmental protection and to reduce pollution.

• Journal of the Korean Operations Research and Management Science Society
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• v.19 no.1
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• pp.169-187
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• 1994

The efficiency of marketing channel of distribution between a sholesaler and a retailer with uncertain characteristics can be improved by influencing the retailer's ordering pattern. The wholesaler with large unit invetory holding cost can offer a large quantity discount tanks to the great benefit which comes from the transfer of part of his inventory to retailer. The retailer's increasing average inventory holding cost can be offset by the quantity discount and by savings of the ordering cost. Conditions under which marketing channel improvement can be possible are derived.

• Journal of information and communication convergence engineering
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• v.1 no.1
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• pp.1-5
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• 2003

This paper discusses the spectral efficiency and performance of asynchronous direct sequency spread spectrum multiple access systems strict bandwidth limitation by Nyquist filtering. The signal to noise plus interference ratio(SNIR) at the output from the correlation receiver is derived analytically taking the cross correlation characteristics of spreading sequences into account, and also an approximated SNIR of a simple form is presented for the systems employing Gold sequences. Based on the analyzed result of SNIR, bit error rate performance and spectral efficiency are also estimated. and at last, we analyzed improvement rate using RS, convolution as a method for improving functions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.368-370
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• 2006

자외선영역에서 발진하는 엑시머 레이저 장치의 가스 장수명화에 의한 고효율화 방안을 제안하였다. 가스수명에 대하여 불소$(F_2)$의 감소와 불순물 발생에 의한 출력 변화의 이론적 해석 결과를 보고한다.

• Korean Journal of Community Nutrition
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• v.12 no.2
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• pp.178-188
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• 2007

This study was performed to suggest a new efficiency measurement indicator is necessary for evaluating management efficiency of food service operations in contract-managed foodservice companies, to distinguish efficient food service providers and inefficient ones by measuring comparative efficiency among food service operations, and to provide guidance for effective management through showing benchmarking targets for improving inefficient food service providers. The subjects of this study were the 93 B&I foodservice Operations of a domestic contract food service company. The analysis was conducted using CCR model in DEA model. A software, 'Frontier analyst', was used for the analysis. Based on the results derived from comparison of efficiency evaluation classified by providers with use of DEA, it was possible to identify efficient food providers and inefficient providers, and subsequently provide benchmarking guidelines for improvement of the inefficient groups. In analyzing the differences between the results of DEA efficiency evaluation by detailed operation status of food service providers, there was significant difference of efficiency outcomes in terms of contract types, while there was no significant difference in terms of business condition.