• 한국생활과학회지
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• 제12권4호
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• pp.571-578
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• 2003

The purpose of this research was to provide basic information for enhancing sizing suitability in terms of the need for appropriate fit in head gear. The method for this research was to survey about sizing system of head gear, basic measure part, repair service. The subject of this study were 15 head gear companies. The results of this research were as follows : 1. In the sex target analysis according to company type, most of fashion brand companies were producing woman's head gear. In case of the company to produce man's head gear, sizes appeared variously. On the other hand, the sports brand companies were producing unisex head gear and safety helmet companies were producing man's one. 2. The number of size of head gear manufacturing companies were under 3 sizing system. This means that the sizing system of current head gear manufacturing company isn't various. 3. While the measuring part using currently in the company was head girth, one to be considered necessary for manufacturing of head gear except the head girth was head height.

• 대한기계학회논문집A
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• 제37권4호
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• pp.547-554
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• 2013

천연가스 자동차에 장착되는 연료저장용기는 크게 두부, 실린더부 그리고 바닥부로 나뉜다. 실린더부와 바닥부에 관한 연구는 이미 충분히 수행되었으나, 두부 성형에 관한 연구 및 설계자료는 전무한 실정이며, 현재 현장 작업자들의 경험이나 시행착오에 의해 제작되고 있다. 본 연구에서는 천연가스 저장용기의 두부 성형 공정인 열간스피닝 공정 분석을 위하여 회전체 소성가공에 적합한 ALE method를 적용하여 유한요소해석을 수행하였다. 성형인자들(이송거리, 성형시간, 소재의 온도, 회전속도)이 성형롤러의 하중 및 두부의 좌굴에 미치는 영향을 분석하고, 이를 토대로 저장용기의 두부성형 가능성을 검토하였다. 또한 성형해석 결과로 제조된 저장용기 두부의 안전성을 평가하기 위하여 파열압력에 대한 용기의 구조해석 및 실험을 수행하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.202-207
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• 2006

The aeroacoustic noise from intake head of a vacuum cleaner is caused by complicated transient pressure fluctuation and it greatly affects the overall SPL of the vacuum cleaner. In this study, we intended to decrease the overall SPL by reducing the aeroacoustic noise from intake head. In the first the place, we analyzed the aeroacoustic noise from the unsteady fluid analysis of intake head. And then, we grasped the dominant frequency band from the aeroacoustic noise by comparing the spectrum distributions between examinations and analyses. Also, we systematically investigated the aeroacoustic noise sources from each part composing the intake head. Consequently, we redesigned each part of the dominant noise sources and suggested the modified intake head, resulting in the reduction ortho overall SPL by 3.6dB(A).

• 대한치과교정학회지
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• 제20권3호
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• pp.565-581
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• 1990

This study was undertaken to investigate the degree of asymmetry in each part of the head in skeletal craniofacial asymmetric patients, and secondarily to determine the nature of difference existed between asymmetric patients and normal persons. The subjects consisted of 49 asymmetric adult patients and 52 normal adults, and the average ages were 21 years 5 months and 23 years 5 months, respectively. The computerized analyses of 33 linear measurements, 12 angular measurements, and 8 surface areas from posteroanterior cephalometric radiograph were carried out. The conclusions were as follows; 1. Asymmetry was a common finding in both normal and asymmetric group. 2. When the analyses were undertaken after the head was divided into 3 parts anteroposteriorly and superoinferiorly in the asymmetric patients, there were significant asymmetries in all parts excepts in the cranial base region. 3. When the analyses were undertaken after the head was divided into respective 3 parts anteroposteriorly in the asymmetric patients, the more posterior part showed relative stability than the more anterior part. 4. When the analyses were undertaken after the head was divided into 3 parts superoinferiorly in the asymmetric patients, the more superior part showed relative stability than the more inferior part. 5. Twelve variables indicating asymmetry were selected and the highest ranked variable was Me-Mid-sagittal reference line.

• 대한두경부종양학회지
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• 제12권1호
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• pp.88-91
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• 1996

• 한국융합학회논문지
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• 제11권7호
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• pp.163-167
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• 2020

본 연구에서는 피스톤 헤드의 형상별 열응력해석을 진행하여 내구성이 있는 피스톤의 형상을 고찰하기 위한 연구를 진행하였다. 그 결과로서는 온도가 가해지는 부분에서부터 거리가 멀수록 낮은 온도를 볼 수 있다. 피스톤 헤드의 형상에 따라 열을 받는 면적이 다르기 때문에 피스톤 기둥 부분과 스커트부에 영향을 끼치게 된 점을 볼 수 있었다. 본 연구에서는 세 모델이 동일하게 피스톤 헤드의 중심부에서 가장 적은 응력이 나오는 것을 알 수 있었다. Model A는 다른 두 모델에 비해 항복이 발생하는 응력이 가장 작은 것을 알 수 있었다. Model B는 접시형 피스톤헤드로서 피스톤 헤드부가 오목한 형상으로 되어 있어 피스톤 헤드 중심부에서는 주변 부분에 영향을 가장 덜 끼치는 모델임을 알 수 있었다. Model C는 항복이 발생하게 되는 응력이 가장 크게 보였다. 또한 본 연구결과는 내구성이 있는 피스톤의 형상 설계에 유용하게 적용할 수 있다고 사료된다. 피스톤 헤드의 형상에 따른 열응력 해석을 적용함으로서, 본 연구가 미적인 융합에 부합된다고 사료된다.

• 한국응용곤충학회지
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• 제57권4호
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• pp.279-285
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• 2018

곤충 머리의 부분 명칭들과 동소이명(同所異名)인 suture들의 명칭을 구조의 부분별 위치와 기능을 기준으로 하여 정리하고 우리말 이름들을 체계적으로 모아서 조명하였다. 여기에는 머리 표면의 각종 선, 배자의 머리 구분, 머리의 외골격과 내골격, 입 내부구조, 긴주둥이, 더듬이 외부구조와 기본마디, 더듬이 모양, 표면 털 모양에 관한 용어들이 포함되어 있다.

• 한국환경보건학회지
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• 제33권3호
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• pp.211-216
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• 2007

This study was to determine the effect of cooling part of the trunk without harm for the health. The results provide basic data for the development of clothing which could increase work efficiency and reduce body strain in hot environment. Eight males took part in the study. The experiment was conducted in a climate-chamber controlled with $37{\pm}1^{\circ}C,\;50{\pm}5%R.H$. The trunk was divided into six areas to be cooled: head, neck, chest, abdomen, the upper back, the lower back. According to preceding studies, permissible safety cooling limits of skin temperature, of each part of the trunk for four hours cooling were $25^{\circ}C$ on the head, $20^{\circ}C$ on the neck, $27^{\circ}C$ on the chest, $25^{\circ}C$ on the abdomen, $20^{\circ}C$ on the upper back, $20^{\circ}C$ on the lower back. So cooling temperatures of each region set up temperatures above mentioned. In conclusion, the head, the neck and the upper back cooling could reduce sweating amount, rectal temperature and heart rates and reduce the heat stress of workers exposing in the hot environment by decreased subjective sensations of heat and comfort. Thus, it was concluded that effectiveness of cooling among the trunk was best on the head and the neck.

• 한국기계가공학회지
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• 제16권5호
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• pp.157-165
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• 2017

The high-pressure resin transfer molding (HP-RTM) technology has been commercialized for fast production of fiber reinforced composite materials. The high-pressure mixing head was one of the most core component of the HP-RTM process. In this study, a mixing head was systematically designed, manufactured and evaluated. This mixing head was composed of a nozzle, a mixing chamber, a cleaning piston part, and an internal mold release part. In actual, a straight-type structure was newly designed instead of the conventional L-type structure for improving the maximum mixing pressure and mixing ratio precision. The performance of mixing head was showed maximum mixing pressure of 15.22MPa and mixing ratio precision of 0.12%. CFRP molding experiments were successfully obtained a 6~11 laminating carbon sheet using HP-RTM presses and specimen molds.

• 한국의류학회지
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• 제28권1호
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• pp.182-188
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• 2004

The purpose of the study was to provide scientific and accurate data of head shape for men. This study was carried out on 214 men and Factor analysis, Cluster analysis, Duncan analysis with 15 variables were performed using the data. A 3D scanner was used for visual results of head shape. The results were as follows. First, through factor analysis of the variables, three factors were extracted upon factor scores. The first factor described thickness part, and second factor described width parts and the third factor described vertical length parts. Four clusters represented characteristics of men's head types. Type 1 had a larger head thickness, type 2 had a smaller thickness and smaller width. type 4 had a generally larger head. In the distribution of the four clusters, type 1 was distributed 34%. Type 4 was distributed 23%. According to the results, type 1 of the more thick and narrow head was dominant among head types of men.