• 복식문화연구
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• 제23권5호
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• pp.894-905
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• 2015

The present study analyzed data from the 3D measurement of the feet of men aged over 20 years residing in the capital region as part of the 6th Anthropometry of Size Korea. To analyze the characteristics of the foot shapes of young men aged 20~39 years and middle-aged/elderly men aged 40~69 years by age and by type, a cluster analysis was conducted using the factors derived through the factor analysis as independent variables. The results of the study that analyzed the characteristics of foot shapes by type according to differences in age were as follows. First, through the analysis of the characteristics of the foot shapes of young men by type, five factors were extracted, and the foot shapes were classified into three types: Type 1 (short and flat), Type 2 (thick), and Type 3 (long and wide). Second, through the analysis of the characteristics of the foot shapes of middle-aged/elderly men by type, six factors were extracted, and the foot shapes were classified into four types: Type 1 (short and regular), Type 2 (flat), Type 3 (thick), and Type 4 (long and regular). The results of the present study are expected to serve as basic data for the design of shoes by age and foot type.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.575-578
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• 2000

Die design to minimize the die wear in the cold forging process is very important as it reduce the production cost and the increase of the production rate. The quantitative estimation for the die wear is too hard because the prediction of the die wear is determined with many process variables. So, in this paper, the optimal shape of the backward extrusion punch is newly designed through the FE-analysis considering the surface expansion and Archard's wear model in order to reduce the rapid wear rate that is generated for the backward extrusion product exceeding the forming limit. The main shape variables of the backward extrusion punch are the flat, angle, and round of the punch nose part. As the flat and angle of the punch nose are larger, the surface expansion is reduced. and, the wear rate is decreased according to the reduction of the punch round. These results obtained through this study are applied to the real manufacturing process, it is implemented the reduction of the wear rate.

• 한국정밀공학회지
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• 제21권10호
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• pp.180-187
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• 2004

Die design to minimize the die wear in the cold forging process is very important as it reduce the production cost and the increase of the production rate. The quantitative estimation fur the die wear is too hard because the die wear is caused by many process variables. So, in this paper, the optimal shape of the backward extrusion punch is newly designed through the FE-analysis considering the surface expansion and Archard wear model in order to reduce the rapid wear rate that is generated for the backward extruded products exceeding the forming limit. The main shape variables of the backward extrusion punch are the flat diameter, angle, and round of the punch nose part. As the flat diameter and angle of the punch nose are larger, the surface expansion is reduced and the wear rate is decreased according to the reduction of the punch round. These results obtained through this study can be applied to the real manufacturing process.

• 디지털융복합연구
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• 제17권12호
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• pp.461-466
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• 2019

본 연구에서는 인터페이스의 디자인에 있어 시각적 무게에 따라 디자인을 구성할 수 있음을 알아보았다. 우선 인터페이스 디자인은 스큐어모피즘의 시대를 거쳐 플랫디자인에서 머티리얼 디자인 또는 머리티얼 디자인 일부를 차용해 심도와 차원을 표현하고 있었다. 이는 심도와 차원을 표현하기 어려운 메트로 UI와 플랫디자인의 특징에 의한 것이지만 머티리얼 디자인에서는 시선 유도를 위한 별도의 장치는 없었기에 게슈탈트 이론에서 시각적 무게를 구분할 수 있는 원리에 대해 알아보았다. 포지티브와 네거티브, 영역의 크기와 배치, 근접성, 폐쇄성 그리고 관념성이 시각적 무게와 방향에 대해 밀접한 관련이 있었으며 그를 통해 몇 가지 사례를 통해 인터페이스에 적용될 수 있음을 알 수 있었다.

• 한국추진공학회지
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• 제6권2호
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• pp.53-63
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• 2002

터보프롭 엔진(PT6A-62)의 정상상태 및 동적 성능모사를 위한 프로그램을 개발하였다. 특히 이 프로그램은 Flat-rated 성능특성과 압축기서지 및 압축기터빈 입구제한온도 초과 방지를 위한 한도제어 알고리즘을 포함하였다. 해석오차를 최소화 하기 위해 조합 오차 값을 이용한 구성품 성능 데이터의 보간 방법과 온도의 함수로서 계산된 정압비열가 비열비가 사용되었다. 개발된 정상상태 성능해석 프로그램은 고도, 비행속도, 블리드유량, 흡입구온도 및 압력, 제한출력등의 여러 조건을 고려 할 수 있으며, 천이상태 성능해석 프로그램은 일반모드와 압축기 서지 방지 모드, 터빈 제한온도 초과방지 모드로 선택하여 해석을 수행할 수 있도록 구성하였다.

• 대한기계학회논문집
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• 제13권3호
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• pp.323-329
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• 1989

본 연구에서는 판이론으로서는 해석이 불가능한 집중하중작용점에서 응력을 해석할 목적으로 3차원탄성이론과 변링포텐셜(POTENTIAL) 이론을 이용하여 유근평판의 집중하중작용점에서의 응력을 해석하는 방법을 제안하고저 한다.

• 한국정밀공학회지
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• 제12권3호
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• pp.101-109
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• 1995

Axisymmetric and quasi-static finite element analysis of an inflated tire rotating with constant angular velocity and contact to road has been performed. Centrifugal force effect was added to load stiffness matrix and equation of effective material properties were calculated by the Halpin-Tsai formulation. In this report, radial truck/bus tire was analyzed. It was inflated and rotated at speeds up to 140 km/h. Then, contact problem was performed to calculate stress-strain field of tire wiht flat rigid road under the load due to the self-weight of a vehicle. Significant changes of stress-strain field of tire were observed in the finite element analysis. Shear stress, strain and strain energy density were rapidly increased at the dege of #2 belt at freely rotating state. This concentrated stress and strain made belt edge sparation. Under the condition of flat riged road contact, strain energy density of #2 belt, carcass turn-up part were concentrated and bigger values than only freely rotation state. Therefore, dynamic behaivor of tire has to considered as design factors which are affected to belt edge separation and bead breakage.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.359-360
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• 2021

영상의 픽셀기반처리는 한 픽셀의 값을 변환하는데 다른 픽셀의 값에 관계없이 단지 현재의 픽셀의 값에만 의존하여 변환하는 처리를 의미한다. 픽셀기반 처리는 영상 변환, 영상 개선, 영상 합성 등의 많은 분야에서 가장 기초적인 연산으로 사용된다. 산술연산, 히스토그램 평활화, 명암대비 스트레칭 등의 처리 방법들이 있다. 본 논문에서는 드론으로 촬영된 서해안 갯벌 영상에서 갯벌 영역을 명확하게 구분하기 위하여 전처리 과정 중 경계검출부분에서 픽셀기반처리를 이용하여 효율적인 윤곽선을 찾기 위한 방법을 모색한다.

• Human Ecology Research
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• 제61권1호
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• pp.53-71
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• 2023

Dressmaking is a high value-added sector of the fashion industry in which the individuality and skills of designers play a prominent role. The appropriate use of the draping and the flat pattern techniques in the dressmaking process also play an important part in perfecting the finished product. The purpose of this study was to improve the understanding of dress design and identify a pattern production technique to enhence efficiency in each of the three elements of the dress manufactureing process. For this purpose, analysis of the design of 1,389 wedding dress photographs published in Wedding 21, Korea's leading wedding magazine, during 2019 and 2020 was conducted. This analysis identified 15 bodice designs and 11 sleeve designs based on neckline and eight skirts based on silhouette which were ranked by frequency distribution. Patterns for the design of samples were then developed according to the highest combined frequency distribution of these three elements. Eight samples were finally produced to test the the efficiency of the patternmaking techniques empolyed and the selected designs. The findings from this study have practical applications, notably in improving the efficiency of pattern production techniques that will facilitate further growth in the dressmaking industry.

• 복식
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• 제65권6호
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• pp.1-14
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• 2015

This study is aims to study the background of how the shape of the wooden shoes developed and worn by Koreans and Japanese in the ancient times by sorting and examining the types and shapes. Relevant bibliography, which are mainly related to the excavated wooden shoes from 3 B.C.E to C.E. 8., were used as research materials. The formation of wooden shoes required easy access to raw materials -which is trees- for production. According to the analysis, both Korea and Japan made the flat wooden shoes using cuboid wood. Both countries bore a hole on a specific location to distinguish the right foot and left foot, however the style of the heel was different in the two countries. The slip-on(Undu-hyeong) wooden shoes were also common in both countries. The slip-on had no-heels and was made by digging-out a piece of the cuboid wood. Some slip-ons made by the Japanese had furrows on the bottom, and they were known to make different types of the slip-on wooden shoes depending on the purpose. Observation of the wearing methods show that commonality can be found between the wooden shoes of Korea and Japan, and this indicates that cultural exchanges between the Silla/Baekje and Japan took place from the 4th to the 6th century. Also, the flat wooden shoes in Japan developed rapidly, as the shoes became an integral part of its life and culture, which was closely tied to agriculture. Eventually, due to the difference in climate and life-style, the slip-ons became the primary type of wooden shoes in Korea, while the flats became the main type of wooden shoes in Japan. It is, however, clear that as the relationship between the two countries became closer, the cultural exchanges regarding the wooden shoes were considerable.