• 한국정보전자통신기술학회논문지
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• 제3권2호
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• pp.3-11
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• 2010

본 논문에서는 얼굴에서 양 눈의 홍채를 검출하기 위한 새로운 알고리즘을 제안하고자 한다. 제안된 방법은 분리 필터를 이용하여 소영역을 먼저 추출하고, 그 중 쌍을 이루고 있는 소영역에 대하여 허프 변환과 분리 필터 값을 연산한다. 제안된 알고리즘은 허프 변환과 분리 필터 값을 최소로 하는 소영역 쌍을 선택하여 양 눈의 홍채로 검출하게 된다. 안경을 착용하지 않은 150장의 얼굴영상을 가지고 제안된 방법으로 실험한 결과 최고 97.3%, 최저 95.3%의 성공률을 얻을 수 있었다.

• 한국정보통신학회논문지
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• 제20권1호
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• pp.131-141
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• 2016

SRM은 저비용, 간단한 자기구조, 넓은 운전속도, 높은 효율, 직류전원과의 우수한 결합성 등의 장점을 가진 전동기구이다. SRM의 토오크는 자속의 방향과는 무관하여 자기구조의 배치가 유연한 특성을 가지고 있어 다양한 자기구조를 가지고 있다. 본 논문에서는 자속방향에 따라 Radial-Flux SRM와 Axial-Flux SRM로 크게 나누었고 기계적인 구조의 차이에 따라 Radial-Flux SRM에는 Conventional, Segmented stator and rotor, Double stator SRM 로, 그리고 Axial-Flux SRM에는 C-core stator와 Axial-airgap SRM로 분류하였고 각각에 대해 비교 해석하여 적절한 용도에 최적의 자기구조를 선택할 수 있도록 각각의 기본적인 특성을 제시하였다.

• 정보처리학회논문지B
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• 제10B권4호
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• pp.459-464
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• 2003

본 논문에서 제안한 위치 이동에 무관한 웨이블렛 변환을 이용한 홍채 인식 방법은 영상 획득 장비에 의해 획득한 사용자의 눈 영상에 대하여 홍채 영역만을 추출하기 위한 전처리를 수행하고 전처리를 거친 홍채 영상에 의하여 사용자의 신원을 식별하는데 있어서 홍채 영상의 기울어짐 및 이동 문제를 해결하였다. 이를 위해서 일반적인 웨이블렛을 사용하는 대신, 위치 이동에 무관한 웨이블렛 변환을 통하여 최적의 특징값을 추출한후, 이를 코드화하여 저장한 후, 비교하여 본인 여부를 식별하였다. 실험결과 제안된 방법으로 생성된 특징 벡터와 기존에 등록된 특징 벡터의 일치도 측정에 있어서 종래의 웨이블렛 변환 홍채 인식 방법보다 오인식률(FAR) 및 오거부율(FRR)이 현저하게 감소하였다.

• 한국의류학회지
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• 제44권3호
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• pp.464-484
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• 2020

This study examined obese women with a BMI index over than 25 kg/㎡ in their 20s and 30s regarding the right fit for wearing a blouse. In comparison with three types of existing educational patterns, the first educational pattern experimental clothing was produced in dimensions of three study participants selected by the existing pattern to evaluate the fit suitability conducted for groups of study participants and expert groups. Experimental patterns were designed based on educational pattern C, which was the best fit as a result of the fitting evaluation. The main modification items include front bust circumference, hip circumference, back interscye, scye depth, shoulder length, blouse length, bottom line shape, upper arm circumference, wrist circumference, sleeve length and collar size. The design preferences for obese women were reflected in pattern modification; in addition, the final experimental pattern was designed by adding or subtracting margins and dimensions based on the results of the visual matching assessment by study subjects and expert groups.

• Earthquakes and Structures
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• 제12권6호
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• pp.629-641
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• 2017

Foundation plays a significant role in safe and efficient turbo machinery operation. Turbo machineries generate harmonic load on the foundation due to their high speed rotating motion which causes vibration in the machinery, foundation and soil beneath the foundation. The problems caused by vibration get multiplied if the soil is poor. An improperly designed machine foundation increases the vibration and reduces machinery health leading to frequent maintenance. Hence it is very important to study the soil structure interaction and effect of machine vibration on the foundation during turbo machinery operation in the design stage itself. The present work studies the effect of harmonic load due to machine operation along with earthquake loading on the frame foundation for poor soil conditions. Various alternative foundations like rafts, barrette, batter pile and combinations of barrettes with batter pile are analyzed to study the improvements in the vibration patterns. Detailed computational analysis was carried out in SAP 2000 software; the numerical model was analyzed and compared with the shaking table experiment results. The numerical results are found to be closely matching with the experimental data which confirms the accuracy of the numerical model predictions. Both shake table and SAP 2000 results reveal that combination of barrette and batter piles with raft are best suitable for poor soil conditions because it reduces the displacement at top deck, bending moment and horizontal displacement of pile and thereby making the foundation more stable under seismic loading.

• 한국전기전자재료학회논문지
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• 제19권4호
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• pp.339-343
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• 2006

We observed the application possibility of inductive coupler for the underground high-voltage power line communication by means of analysis of signal transmission characteristics and magnetic properties on annealing temperatures for high-permeability Fe-base amorphous alloys. The best electromagnetic and transmission characteristics were shown in nano-crystalline precipitated alloy annealed at temperature $510^{\circ}C$. The transmission characteristics in the low-frequency band depend on permeability of magnetic core materials and its properties of high-frequency band can be improved by impedance matching. Using the high pass filter embedded in the coupler, other noise signal band except for communication signals could be cut off.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1991년도 추계학술대회 논문집
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• pp.68-72
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• 1991

In this study, to improve temperature stability 0.05 Pb(Sn$\_$$\frac{1}{2}$/Sb$\_$$\frac{1}{2}$/O$_3$ - 0.35PbTiO$_3$ - 0.60PbZrO$_3$ + 0.4[wt%]MnO$_2$ piezoelctric oeramics of low dielectric constant and large mechanical quality factor were manufactured with the addition of Cr$_2$O$_3$by Hot Press method. And the SAW delay line was fabricated and the propagation characteristics of SAW was investigated, and the SAW filter was fabricated on C4 added by 0.2[wt%] Cr$_2$O$_3$and its frequency characteristics was investigated. The specimen, whose propagation characteristics of surface acoustic wave were the best, was C4 added by 0.2[wt%] Cr$_2$O$_3$, and its electromechanical coupling factor(ks$^2$) was 3.11[%] and its temperature coefficient of the center frequency (C$\_$fo/) was -21.27[ppm/$^{\circ}C$]. The 31[MHz] SAW IF filter of C4 scarcely had diffraction phenomena and its group delay time was 1.4673 ${\pm}$40[ns] in the pass band, and the insertion loss was -24.419[dB] on no impedance matching.

• 수산경영론집
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• 제12권2호
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• pp.61-71
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• 1981

This essay examines the marketing of Fishermen's Cooperative in Korea, and in particular considers the marketing channel of fisheries products, No company can perform by itself all the activities involved in the production and distribution of its products and services to its final markets. It must work with other firm to get the job done. Thus marketing channel firms of the fisheries products include primarily the Fishermen's Cooperative the licensed dealers and tile merchant middlemen, The goal of marketing is in matching of segments of supply and demand. Every producer seeks to the link the marketing channel firms that will help it accomplish its objective best. Therefore this study surveys the three types of marketing channels through tile central market That. is, they are a marketing channel through the terminal market, a marketing channel through the fishermen's cooperative terminal market, and a marketing channel through the private fish market. Consequently the Fishermen's Cooperative can choose to improve in any of tile marketing channel as follows: \circled1 The Fishermen's Cooperative is nominated wholesaler in the terminal market. \circled2 It is abolished to sell by double auction in the production district terminal market and the consuming city terminal market of Fishermen's Coopertive. \circled3 The steady wholesalers in private fish market are entitled to the licensed dealers. \circled4 The Fishermen's Cooperative sponsored voluntary chains join with retailer, supermarkets, consumers' society. Therefore the study of marketing channel of fisheries products can appropriately referred to satisfying needs and wants through exchange process.

• 대한치과교정학회지
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• 제42권4호
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• pp.169-181
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• 2012

Objective: The purpose of this study was to develop superimposition method on the lower arch using 3-dimensional (3D) cone beam computed tomography (CBCT) images and orthodontic 3D digital modeling. Methods: Integrated 3D CBCT images were acquired by substituting the dental portion of 3D CBCT images with precise dental images of an orthodontic 3D digital model. Images were acquired before and after treatment. For the superimposition, 2 superimposition methods were designed. Surface superimposition was based on the basal bone structure of the mandible by surface-to-surface matching (best-fit method). Plane superimposition was based on anatomical structures (mental and lingual foramen). For the evaluation, 10 landmarks including teeth and anatomic structures were assigned, and 30 times of superimpositions and measurements were performed to determine the more reproducible and reliable method. Results: All landmarks demonstrated that the surface superimposition method produced relatively more consistent coordinate values. The mean distances of measured landmarks values from the means were statistically significantly lower with the surface superimpositions method. Conclusions: Between the 2 superimposition methods designed for the evaluation of 3D changes in the lower arch, surface superimposition was the simpler, more reproducible, reliable method.

• 한국통신학회논문지
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• 제26권12C호
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• pp.218-224
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• 2001

분산병렬처리의 목적은 다양한 내재 병렬 형태의 특징을 갖는 연산 집약적 문제를 고속 네트웍으로 연결되어진 다수의 고성능 및 병렬 컴퓨터들의 각기 다른 능력을 최대한 이용하여 해결함에 있다. 본 논문에서는 분산병렬시스템을 이용하는 경우의 성능 향상 분석을 위해 일반적인 그래프 표현 방법을 포함하는 계산 모델을 제안하고 프로그램의 수행을 위한 스케쥴링 시에 성능 향상이 어떠한 요인에 의해 달성되는지를 분석한다. 제안된 표현 방법은 동기종 및 이기종 시스템 모두에 적용되어질 수 있다. 분산병렬 시스템에서 스케줄링을 통하여 더 많은 속도향상을 얻기 위해서는 태스크와 병렬 컴퓨터간의 병렬특성의 일치가 주의 질게 다루어져야 하며 태스크의 이동으로 인한 통신 오버 헤드가 최소화 되어야 한다.