• 센서학회지
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• 제22권4호
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• pp.286-291
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• 2013

This paper presents to analyze patterns from single and complex malodors using gas sensor array based on metal oxide semiconductors. The aim of research is to identify and discriminate single malodors such as $NH_3$, $CH_3SH$ and $H_2S$ and their mixtures according to concentration levels. Measurement system for analyzing patterns from malodors is constructed by an array of metal oxide semiconductor sensors which are available commercially together with associate electronics. The patterns from sensory system are analyzed by Principal Component Analysis (PCA) which is simple statistical pattern recognition technique. Throughout the experimental trails, we confirmed the experimental procedure for measurement system such as sensors calibration time and gas flow rate, and discriminated malodors using pattern analysis technique.

• 반도체디스플레이기술학회지
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• 제18권2호
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• pp.6-10
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• 2019

In the presence of $\mu-tip$ for narrow stripe coating, there appears lateral capillary flow along the hydrophilic head lip because the $\mu-tip$ has some resistance to flow. It was known to be suppressed by increasing the contact angle of the head lip. In this paper, we have demonstrated by computational fluid dynamics(CFD) simulations that it can also be suppressed by the formation of micro-patterns on the shim and meniscus guide embedded into the slot-die head. To optimize the micro-patterned structure, we have performed simulations by varying the groove width, depth, and clearance. In the absence of micro-patterns, it is shown by experiment and simulation that the solution spreads to a distance of $1,300{\mu}m$ from the ${\mu}-tip$. In the presence of micro-patterns with the groove width and clearance of $50{\mu}m$, the distance the solution spreads is reduced to $260{\mu}m$. However, no further suppression in the capillary flow is observed with micro-patterns with the groove width of $40{\mu}m$ or less. It is also observed that the capillary flow is not affected by the groove depth if it is larger than $10{\mu}m$. We have shown that the distance the solution spreads can be reduced further to $204{\mu}m$ by coating a hydrophobic material (contact angle of $104^{\circ}$) on the surface of micro-patterns having the groove width and clearance of $50{\mu}m$.

• 센서학회지
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• 제13권6호
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• pp.446-453
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• 2004

A portable electronic tongue (E-Tongue) system using an array of ion-selective electrode (ISE) and personal digital assistants (PDA) for recognizing and analyzing food and drink have been designed. By the employment of PDA, the complex algorithm such as fuzzy c-means algorithm (FCMA) could be used in E-Tongue, PUMA could iteratively solve the cluster centers of pre-determined standard patterns. And the membership between the standard patterns and unknown pattern could be analyzed easily by the present E-Tongue combined with PDA.

• 디지털융복합연구
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• 제12권8호
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• pp.67-76
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• 2014

본 연구에서는 한국과 미국 대학생들을 대상으로 페이스북에서의 상품의견지도력과 커뮤니케이션 활동을 조사하였다. 기존에 수집된 한국 대학생 자료를 바탕으로 미국 대학생의 페이스북 이용과 관련한 자료를 추가로 수집하여 분석함으로써 한국과 미국 상품의견지도자의 특성을 비교하였다. 본 연구의 연구 방법으로 온라인 설문을 실시하였으며, 미국 두 개 대학에서 일차자료를 수집하였고, 한국의 이차자료를 이용하였다. 연구결과 의견지도력에 있어서 한국 남학생보다 미국 남학생이 높은 것으로 나타났다. 한국 대학생의 경우 상품의견지도력이 능동적 수동적 커뮤니케이션 활동과 유의미한 관계가 있는 것으로 나타난 반면, 미국 대학생의 경우 상품의견지도력은 수동적 커뮤니케이션 활동에만 유의미한 연관성이 있는 것으로 나타났다.

• 한국정보통신학회논문지
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• 제9권4호
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• pp.745-752
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• 2005

본 논문에서는 무선환경을 이용하여 이동하는 객체의 확인 및 위치 추적을 위한 시스템에서 수신부측의 디지털부를 구현하고자 한다. 구현한 시스템의 경우에 UWB를 이용한 통신 시스템을 가정하였고, 전체적인 통신 방식은 직렬 통신(RS-232) 방식을 따른다. 디지털 수신기는 직렬 통신의 입출력을 담당하는 RS-232-type1/RS-232-type2, ID 검출을 위한 ID Detector, 그리고 ID Detector의 올바른 동작을 위해 입력을 버퍼링하는 PISO&Buffer 회로로 구성된다. 디지털 수신기는 UWB를 이용한 시스템의 응용 목적에 따라서 최소의 하드웨어 자원을 이용하면서 구현하고자 하였다. 따라서 다중 ID에 대해서 내부적인 반복 검출 방법으로 원래의 패턴과 상관성을 검사한다. 또한 기본 ID를 내장하고 있어 송신 신호에 대해서 즉각적인 검출이 가능하고, 다른 시스템과의 호환성을 고려하여 ID 패턴의 내용 및 길이를 프로그래밍하여 사용할 수 있다. 구현된 하드웨어는 Xilin의 XC2S100PQ208-5 칩에 사상하였고 727($30\%$)개의 셀을 이용하면서 해당 칩에서75MHz(13.341ns)의 clock frequency로 동작할 수 있었다.

• Journal of applied mathematics & informatics
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• 제26권3_4호
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• pp.563-572
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• 2008

In this paper, we discuss about a generalization of the Key Distribution Pattern which was proposed by C. Mitchell and F. Piper[6]. It is allowing secure communication between every n-pair of users($n\leq2$) in a large network for reducing storage requirements. We further suggest a generalization of K. Quinn's bounds in [9] for the number of subkeys in such general Key Distribution Patterns.

• 대한전자공학회논문지
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• 제27권5호
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• pp.666-671
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• 1990

The characteristics of the corrugated conical horn antenna for the satellite communication earth station operating at C band is analyzed and its radiation patterns is measured. We obtain the characterstic equations for corrugated horn in the condition that the balanced hybrid mode is formed on born aperture and calculate radiation patterns in the Fresnel region from the aperture integral expressions obtained by the equivalence principle. The radiation patterns which are calculated for the frequency of 3.85GHz and 6.18GHz are well agreed with the measured data.

• 가정과삶의질연구
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• 제9권1호통권17호
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• pp.27-44
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• 1991

The purpose of this study is to investigate the relationship between communication pattern and conflict between old parents and their adult children. For this purose, 380 adult children are surveyed therefore the answers of survey are described by adult children only. The number of old parents turn to be 230 old fathers and 301 old mothers respectively, there numbers have included the case both parents are alive. The data were analysed several method with SPSS and the methods used for the analysis are Factor analysis, one way ANOVA, Scheffe-Test, Pearson's Correlation, Multple Regression. The results of this study are summarizd as follows ; 1) Old parents's communication patterns differ each other and under many variables. 2) In the conflicts between old parents and adult children differ each other and under many variables, too. 3) The relationship between communication patterens and conflict between old parent and adult children turn to be as follows : Two communication styles ie, the autoritarian style and insincere style increse conflicts. Frendly style have negatve affect to conflicts and decreses the conflicts. Sacrifice style is turn to have slightly affect the conflict.

• 한국인터넷방송통신학회논문지
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• 제15권4호
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• pp.217-222
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• 2015

종방향 모드 전송선로 이론을 이용하여 실리콘 도파로에 기초한 플라즈마 격자 구조형 방향성 결합기(P-GADC)의 1D & 2D 격자 패턴에 따른 전송 모드 특성을 정확하게 분석하였다. 정확한 해석적 수식과 기, 우 모드 사이의 간섭특성에 의존하는 중첩모드를 정의하여 각 격자 패턴에서 발생하는 TE 모드의 필드분포를 수치해석 하였다. 수치해석 결과, 최대 결합효율을 발생시키는 필드분포는 정사각형 격자 패턴으로 구성된 P-GADC에서 발생하였다. 즉, GADC의 전형적인 최대 결합효율 조건인 위상정합 조건과 다른 최소간격 조건인 격자주기 $d_{min}=8.8{\mu}m$에서 발생하였다.

• International Journal of Contents
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• 제3권2호
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• pp.18-24
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• 2007

Biological sequences such as DNA and amino acid sequences typically contain a large number of items. They have contiguous sequences that ordinarily consist of more than hundreds of frequent items. In biological sequences analysis(BSA), a frequent contiguous sequence search is one of the most important operations. Many studies have been done for mining sequential patterns efficiently. Most of the existing methods for mining sequential patterns are based on the Apriori algorithm. In particular, the prefixSpan algorithm is one of the most efficient sequential pattern mining schemes based on the Apriori algorithm. However, since the algorithm expands the sequential patterns from frequent patterns with length-1, it is not suitable for biological datasets with long frequent contiguous sequences. In recent years, the MacosVSpan algorithm was proposed based on the idea of the prefixSpan algorithm to significantly reduce its recursive process. However, the algorithm is still inefficient for mining frequent contiguous sequences from long biological data sequences. In this paper, we propose an efficient method to mine maximal frequent contiguous sequences in large biological data sequences by constructing the spanning tree with a fixed length. To verify the superiority of the proposed method, we perform experiments in various environments. The experiments show that the proposed method is much more efficient than MacosVSpan in terms of retrieval performance.