• 디지털산업정보학회논문지
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• 제15권1호
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• pp.67-76
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• 2019

Despite attractive advantages such as good time-frequency localization and improved spectral efficiency, filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) suffers from multipath fading. In highly frequency-selective channels, the effect of multipath interference can significantly distort the FBMC/OQAM signal due to the absence of cyclic prefix. To resolve the problem of the multipath interference in FBMC/OQAM, this paper proposes applying an antenna array that provides well shaped beam pattern for each multipath. To evaluate the performance of the proposed array system, various computer simulations have been conducted. The accuracy of direction of arrival estimation is demonstrated through spatial spectrum for a different number of antennas in a sub-array. The performance improvement is presented in terms of bit error rate. We found that the proposed array system mitigate the multipath interferences in Extended Typical Urban model with 12 antennas in a sub-array. Moreover, as the number of antennas in a sub-array increases, the system provides a signal-to-noise ratio gain.

• 한국산림과학회지
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• 제99권1호
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• pp.36-46
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• 2010

본 연구는 서울 및 수도권 거주자를 중심으로 산림방문수요를 분석하여 산림방문수요증진을 위한 정책적 시사점 도출을 목적으로 수행되었다. 산림선택속성의 요인분석을 통하여 도출된 총 6개의 요인, 인구통계적 특성, 산림 이용과 관련된 일반적 사항 등의 독립변수를 이용하여 종속변수인 지난 1년간 산림 방문횟수에 대한 결정요인을 파악하였다. 분석결과, 산림방문수요에 정(正)의 영향을 미치는 변수는 산림선택속성 중에서 관광자원요인, 인구통계적 변수들 중에서는 남성, 서울 거주자일수록, 산림이용과 관련된 변수들 중에서는 대중교통을 이용하는 경우인 것으로 나타났다. 반면, 산림방문수요에 부(負)의 영향을 미치는 변수는 산림선택속성요인 중에서 산림외적요인, 인구통계적 특성 중 화이트컬러 직업군 종사자, 대졸이상 학력자인 경우로 나타났다. 이러한 결과를 바탕으로 산림방문 수요 확대를 위한 시사점을 도출하였다.

• IEIE Transactions on Smart Processing and Computing
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• 제3권5호
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• pp.338-344
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• 2014

As the role of information collection becomes increasingly important in the enormous data environment, there is growing demand for more intelligent information technologies for managing complex data. On the other hand, it is difficult to find a solution because of the data complexity and big scaled amount. Accordingly, there is a need for a special intelligent knowledge base frame that can be operated by itself flexibly. In this paper, by adopting switching function for signal transmission in the synapse of the human brain, I/E selective activation based knowledge reconfiguring mechanism is proposed for building more intelligent information management system. In particular, knowledge network design, a special knowledge node structure, Type definition, I/E gauge definition and I/E matching scheme are provided. Using these concepts, the proposed system makes the functions of activation by I/E Gauge, selection and reconfiguration. In a more efficient manner, the routing and reasoning process was performed based on the knowledge reconfiguration network. In the experiments, the process of selection by I/E matching, knowledge reconfiguration and routing & reasoning results are described.

• 한국컴퓨터정보학회논문지
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• 제6권2호
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• pp.27-33
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• 2001

본 논문에서는 ARIES를 기반으로 하는 ARIES/SR이라 명명된 간단하고 효과적인 회복 기법을 제안한다. ARIES는 거래가 완료되었거나 완료되지 않았거나 관계없이 모든 거래에 의해 수행된 갱신 연산에 대해 재수행을 수행한다. 따라서 시스템 고장 후 회복시 큰 부담이 존재한다. 따라서 이러한 부담을 줄이기 위해 ARIES/SR이란 새로운 회복기법을 제안한다. 이 기법에서는 재수행 연산을 줄이기 위해 완료된 거래에 대해서만 재수행 연산을 수행한다. 또한 미 완료된 거래에 대해 조건적인 철회를 수행함으로써 회복에 필요한 연산의 횟수를 줄일 수 있는 방법이다.

• Journal of Information Technology Applications and Management
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• 제10권2호
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• pp.61-71
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• 2003

Ad-hoc networks are characterized by multi-hop wireless links, frequently changing network topology and the need for efficient dynamic routing protocols. In an Ad-hoc network, each host assumes the role of a router and relays packets toward final destinations Because a packet is broadcast to all neighboring nodes, the optimality criteria of wireless network routing is different from that of wired network routing. tn this paper 1 point out the more important cost factor than the number of links in the Ad-hoc network. A class routing protocols called on-demand protocols has recently found attention because of their low routing overhead since it performs a blind flooding to look for a path. In this paper, 1 propose the method which reduces overhead by using the information of neighboring nodes and doing a selective flooding. Simulation results demonstrate better reduction of routing overheads with this scheme.

• Mass Spectrometry Letters
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• 제14권4호
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• pp.141-146
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• 2023

Liraglutide is a medication prescribed for the management of type 2 diabetes and chronic obesity. A simple, sensitive, and selective liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for the quantitative analysis of liraglutide in rat plasma. After a simple protein precipitation step, liraglutide was chromatographically separated using the ACQUITY Premier Peptide BEH C18 Column with mobile phases comprising 50% acetonitrile and 50% methanol, and water with 0.3% FA. Positive ion electrospray ionization in multiple reaction monitoring mode was used to achieve detection. Good linearity was observed in the 5-600 ng/mL concentration range (R² > 0.99). Liraglutide had intra- and inter-day precision values of 2.13%-9.86% and 4.14%-8.36%, respectively. The accuracy ranged from -2.36% to 2.58%. The recovery and matrix effect were within acceptable limits. This selective LC-MS/MS method was used to study the pharmacokinetic properties of liraglutide after subcutaneous administration in rats.

• 한국조리학회지
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• 제12권2호
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• pp.18-38
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• 2006

We studied franchisees’ answers to the questionnaires to know their selective motives and criteria, their types and the reliability of a franchisor in the food-service industry. Then we showed the basic data about the selective criteria of a sound franchisor. The result of this study was as follows. First, we need a specialist and a department to present a financially sound franchisor. Second, we must determine the criteria of franchise fee, royalty and the other items on payment for the franchisor. Third, the alternative plan to trust the franchisor was needed for a large-scale franchisee.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.740-745
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• 2005

Selective assembly is a method to find out appropriate matching pairs to be assembled to enhance the quality of the product. This study proposes an algorithm to select and match the components with two performance characteristics: at first, the number of matchable mates are calculated for each components. A matchable mate is defined to be the one of which the values of each performance characteristics lie in a rectangular mesh originated from the component under consideration. And the highest priority is given to the item with smallest number of matchable mates. The item of highest priority is matched to the one with smallest number of matchable mates among them. To find out the mates for the unmatched items, the mesh size is enlarged at the next iteration. Beginning with a small mesh, the procedure is repeated until the mesh covers the tolerance intervals of each performance characteristics. A VCR head case is analyzed.

• 복식문화연구
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• 제2권2호
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• pp.355-369
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• 1994

The purpose of this study was to investigate the relationship between the social values and selected clothing behavior variable for a group of working women in Kwang Ju, Chonnam, Korea. The findings of this study as follows: 1. The were differences in selective clothing variables according to their general characteristics; age, marital status, religion. 2. There were differences in selective clothing variables according to their occupational characteristics; type, length of employment, income. 3. A significant relationship was found between he social values and selected clothing behavior variables; There were significant relationship between the social trend and five clothing behavior variables; social approval, psychological dependence, satisfaction, comfort, interest. There ere significant relationship between the human relation and one clothing variables; management. There were significant relationship between the popularization and three clothing behavior variables; social approval, psychological dependence and management.

• 한국경영과학회지
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• 제24권1호
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• pp.39-48
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• 1999

An economic procedure of selective assembly is proposed when a product is composed of two mating components. The major qualify characteristic of the product is the clearance between the two components. The components are divided into several classes prior to assembly. The component characteristics are assumed to be independently and normally distributed with equal variance. The procedure is designed so that the proportions of both components in their corresponding classes are the same. A cost model is developed based on a quadratic loss function and methods of obtaining the optimal class limits as well as the optimal number of classes are provided. Formulas for obtaining the proportion of rejection and the unavailability of mating components are also provided. The proposed model is compared with the equal width and the equal area partitioning methods using a numerical example.