• 핵의학기술
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• 제21권2호
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• pp.65-73
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• 2017

Purpose 3D 프린팅 기술은 3D 스캔이나 모델링을 통하여 적측가공 방식으로 제작하는 기공기술로서 금형 없이 직접 생산이 가능하고 빠른 시간 내에 제작이 가능하여 최근 다양한 산업분야에서 본격적으로 적용되고 있다. 3D 프린팅 기술은 의료분야에 있어, 영상의학 및 방사선 치료분야에서 다양하게 활용되고 있지만 핵의학 분야에서는 관련 연구가 미비한 실정이다. 그러므로 본 연구는 기존에 적용되고 있는 핵의학분야 팬텀과 3D 프린팅 기술로 제작된 텀의 특성을 비교하고 적용 가능성을 평가하는데 목적을 두었다. Materials and Methods 방사선 투과도 변화측정 국제기준 팬텀인 알루미늄(Aluminum) 계단 쐐기(step wedge)를 기준($140mm{\times}62mm{\times}35mm$)으로 PMMA(Poly Methyl Meta Acrylate)와 ABS(Acrylonitrile Butadiene Styrene)재질로 각각 동일한 크기의 팬텀을 제작하였다. PMMA 팬텀은 핵의학 분야에서 주로 적용되는 팬텀의 성분과 동일한 소재로 제작하였고, ABS 팬텀 제작은 3D 프린팅 기술의 액체 기반형의 SLA(Stereo Lithography Apparatus)기법을 사용하여 제작하였다. 본 연구는 SPECT/CT장비 BrightView XCT(Philips Health Care, Cleveland, USA)를 이용하였다. 영상 획득은 Rectangular Flood phantom(Biodex, New York, USA) $^{99m}TcO_4$ 3, 6 mCi와 $^{57}Co$ lood phantom(adqual, New Hampshire, USA) $^{57}Co$ 20 mCi를 이용하여 Aluminum, PMMA, ABS 팬텀에 대해 60 min 리스트모드(List mode)로 획득하였다. 획득한 영상의 분석을 위해 관심영역(ROI)을 설정하여 각 팬텀의 단계별로 평가하였다. Results 방사선원의 종류 및 방사선량에 따라 ABS 팬텀의 계수치는 PMMA 팬텀의 계수치와 유사한 값을 나타내며, 두께의 증가에 따라 선형적으로 감소하였다. Aluminum, PMMA, ABS 팬텀의 선감약계수를 비교했을 때, Aluminum 팬텀의 선감약계수는 나머지 두 팬텀보다 수치가 높았고, PMMA, ABS 팬텀에서는 근사치의 선감약계수가 나타났다. Conclusion 3D 프린팅 기술로 제작된 ABS 팬텀을 기준으로 PMMA 팬텀은 두께가 증가함에 따른 계수치의 변화가 유사하게 선형적으로 감소하였고, 선감약계수도 근사치로 나타내었다. ABS 팬텀의 핵의학적 적용 가능성을 확인할 수 있었으며, 추후 연구를 통해 세부적인 교정치(correction value)를 적용한다면 활발한 적용이 가능하리라 사료된다.

• Nuclear Engineering and Technology
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• 제47권4호
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• pp.472-478
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• 2015

The patient dose incurred from diagnostic procedures during advanced radiotherapy has become an important issue. Many researchers in medical physics are using computational simulations to calculate complex parameters in experiments. However, extended computation times make it difficult for personal computers to run the conventional Monte Carlo method to simulate radiological images with high-flux photons such as images produced by computed tomography (CT). To minimize the computation time without degrading imaging quality, we applied a deterministic adaptation to the Monte Carlo calculation and verified its effectiveness by simulating CT image reconstruction for an image evaluation phantom (Catphan; Phantom Laboratory, New York NY, USA) and a human-like voxel phantom (KTMAN-2) (Los Alamos National Laboratory, Los Alamos, NM, USA). For the deterministic adaptation, the relationship between iteration numbers and the simulations was estimated and the option to simulate scattered radiation was evaluated. The processing times of simulations using the adaptive method were at least 500 times faster than those using a conventional statistical process. In addition, compared with the conventional statistical method, the adaptive method provided images that were more similar to the experimental images, which proved that the adaptive method was highly effective for a simulation that requires a large number of iterations-assuming no radiation scattering in the vicinity of detectors minimized artifacts in the reconstructed image.

• 패션비즈니스
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• 제28권2호
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• pp.64-75
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• 2024

Clothing is a powerful medium that reflects the environment, situation, and trends of the times. It has been an important subject of semiotic analysis, particularly in East Asia. While Korea, China, Japan, and Mongolia are geographically close, they have each developed unique characteristics in their clothing. These characteristics continue to evolve over time. The purpose of this paper is to explore the modern fashion design characteristics of these four East Asian countries by using the Greimas symbol square. To achieve this, the paper follows a research method consisting of several steps. First, it considers previous studies on the topic. Second, it analyzes fashion collections from Paris, Milan, New York, and London, as well as the Seoul and Cruise collections, from 2013 to 2024. Third, it compares costumes and modern fashion designs of brands known for their East Asian influences. Finally, it applies the framework of the Greimas symbol square to analyze the main elements of dress culture in these four countries and their significance in modern fashion collections. The findings of this study reveal that East Asian costume culture can be summarized into four distinct characteristics in modern fashion. Korea is characterized by "moderation," China by "exaggeration," Japan by "distinctiveness," and Mongolia by "symbolism."

• Ocean and Polar Research
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• 제23권2호
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• pp.195-203
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• 2001

A fine-grid (3 km ${\times}$ 3 km), three-dimensional nowcast system of sea levels, currents, temperature, and salinity is being developed for the Taiwan Strait. The project takes a balanced approach relying equally on models and observations, will have the capacity of real-time data assimilation, and is aimed at both practical and scientific applications. To determine boundary conditions and verify model results, eight coastal tide-gauge stations were first established along both sides of the strait. Strait-wide hydrographic surveys were conducted by research vessels. Currents are being measured using bottom-mounted ADCP moorings in a meridional deep channel off southwest Taiwan and along a traverse section in the central part of the strait. In addition to a fine-resolution three-dimensional model of the Taiwan Strait, an adjoint model and a larger-domain two-dimensional model were used to better determine boundary conditions in the northern and southern boundaries of the strait. In the first stage of model development, barotropic tides were successfully simulated in a hindcast mode. The protocol product has been released to general public, including government agencies, universities and general users.

• 패션비즈니스
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• 제14권4호
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• pp.23-40
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• 2010

The purpose of this study is to explore the aesthetic characteristics of outerization phenomenon of contemporary fashion. Outerization, transforming underwear as outerwear, is one of the most dominant and widespread fashion trends in the dawning of new millenium. Fashion always exists for living body and tributes to express idealized beauty of human body and aesthetics of the era. If so, exploring the formative expressions and aesthetic characteristics of outerization would be an meaningful guideline to deduce changed relationship between fashion and body of the 21st century. The methodology of this study is to research of fashion collections such as Paris, Milan and New York which were held the first decade of new millenium, from 2000 Spring/Summer to 2009 Spring/Summer. The styles expressing outerization were selected and assorted based on the main formative expression. Then the aesthetic characteristics were classified. The way of expression of outerization is categorized into 4 parts ; Transition, Exposure, Transparency, and Deconstruction. Aesthetic Characters of outerization is classified 4 assortments as well ; Eroticism, Fun with parody and kitch, cyber culture, Gender politics, and Power fetish. Eroticism is the most clearly identified one. Coming out of underwear imply naked body itself, so it has erotic appeal. Fun is the second character. A pleasant sensation from the outerization of undergarments maximizes a disposition of play from parody, kitch, and cyber culture. The third is Gender Politics and it introspects how the society consumes woman body in history and modern times. Power Fetish, the last one, speaks for the female body with changed vision for femininity underneath the sphere of influence of feminism and post modernism, then emphasizes the subjectivity and independence of woman. From the research above, this study will help to understand the overwhelming outerization phenomenon and contribute to expansion of the horizon of the study of fashion aesthetics. It will serve fashion creative source through various outerization cases as well.

• 한국의류학회지
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• 제26권10호
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• pp.1455-1466
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• 2002

This research focuses on functionalism in American fashion designs which have become the center of public attention in recent. First, documentary studies about how functionalism, which originated in Europe in the beginning of the 20th century, has been developed throughout the 20th century were preceded Second, content analysis was done for the articles, including the word ‘unction’,‘utility’ and ‘practical’in the New York Times and American Vogue from January 1990 to January 2001. As a result, functionalism in 1990s has been developed in different ways from the mechanical, organic, and mea analogies of functionalism in the beginning of 20th century. It doesn't belong to an analogy but has the fused characteristics of those three analogies. It can be classified into techno functionalism influenced by new technology, pure functionalism related to minimalism, sports casual functionalism for those who are crazy about the speed and sports and enjoy the freedom and comfort, and symbolic functionalism which stresses Zen style. More casual manners of formal wear are distinct elements in functionalist fashion design in 1990s. It leads to strong expressions of sports casual functionalism, which plays a great role in sportswear industry of American fashion design. The American fashion designers who were mentioned often in the articles were Donna Karan, Calvin Klein, Ralph lauren and Tommy Hilfiger. As well as their works have common formative features based on functionalism, each of them shows his/her own strung color. A]1 of these designers make American fashion design, which can be defined as casual wear or sportswear, very popular worldwide based on the developed American functionalism. Functionalism considering practical and conceptional functions will continue in coming century and techno functionalism and sports casual functionalism in future fashion designs wilt be expressed more strongly with new technology and casual trends of life style.

• International Journal of Contents
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• 제8권1호
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• pp.74-81
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• 2012

The aim is to investigate the analgesic effect of transcranial direct current stimulation(tDCS) on central neuropathic pain(CNP) in spinal cord contusive rat model. Twenty Sprague-Dawley rats($250{\pm}50$ g, male) were used. Thoracic spinal cord(T10) was contused using New York University(NYU) spinal cord impactor. The animals were randomly assigned to two groups; GroupI: Non-treatment after SCI induction(n=10), GroupII: application of tDCS(0.1 mA, 20 min/time, 2 times/day, 5 days/6week) after SCI induction(n=10). Assess the effect of tDCS using the Basso Beattie Bresnahan(BBB) locomotor rating scales, Touch $test^{TM}$ sensory evaluator(TTSE), Plantar test$^{\circledR}$after contusion at the $2^{nd}$, $3^{rd}$, $4^{th}$, $5^{th}$, $6^{th}$ week and the immunohistochemistric response of c-fos in the thalamus, cerebral cortex after contusion at the $3^{rd}$, $6^{th}$ week after SCI. The scores of BBB scales were significantly different from $3^{rd}$week. TTSE were different significantly over time, but there were no differences at each evaluation times on between-measure time effects. Plantar test were different significantly over time and there were difference at the $4^{th}$, $6^{th}$ week after SCI on between-measure time effects. Also, immunohistochemistric response of c-fos was reduced significantly from $3^{rd}$, $6^{th}$ week after SCI in tDCS group compared with control group in thalamus and cortex. These results identified that tDCS of non-invasive therapeutic method may have beneficial analgesic effect on CNP after SCI with behavioral test and immunohistochemical test.

• 한국응용곤충학회지
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• 제7권
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• pp.39-51
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• 1969

The study involved determination of resistance levels of spider mites ta argano-phosphates using topical application and slide dip techniques; laboratory serening tests of alternative acaricides using an O/P resistant strain and a field trial of the screened materials. 1. Strains of Tetranychus were from Timaru(TR), Havelock Narth (HNR), Lincaln (LN). Germany (GR, GN). Comparisons of the resistant strains and normal strains at the LD50 and LC50 levels were as follows : (a) Using the topical application tochnique; with Parathian. resistant levels of the GR. TR and HNR strains of T. urticae were respeativuly, 1035. 484 and 452 times as resistant' as the LN strain. (b) Using the slide dip technique; with Phosdrin, resistant of GR, TR and HNR strains of T. urticae were 635, 274 and 266 times greater respeativuly, than the GN strain. 2. The laboratory sereaning tests were carried out far their contact plus stomach and residual effect to assess the toxicities of eleven alternative materials which would be used far control of O/P resistant strain of T. urticae. The acaricide groups represented were 3 organo-chlorines (Spidex, Kelthane and C 8514), 2 nitrophenyls (UC 19786 and Morocide), 2 cyclic carbonates(Eradex and Morestan). I carbamate (UC2004 7A), 1 mixture of carbamate and orano-chlorine and 2 other chemicals (C 8677 and M2527). From all acaricide tested. Kelthane and Morocide were the most effective, folowed by Spidex and M2527. Morestan, C8514. C8677 and RS 143 were intermediate, but Eradex, UC 19786 and UC 20046A were poor. 3, The number of sapmles required for estimation of the population in the field evaluation of acaricidal effects was one giving the highest practical precision. It was decided, after preliminary sampling trials. to use samples of 30 leaves per replicate which gave a $5.7\%$ standard error. 4. In the field trials, Morocide applied at the $0.05\%\;and\; 0.04\%$ a. i. conc. to black currant trees gave excellent control of O/P resistant population of T. urticae for about 12 days, but Morocide 0.025 and Kel thane $0.02\%$ a. i. cone. gave efficient control for about 6 days. In other words. first applications of Kel thane ane Moroeide gave very high degrees of control of O/P resistant population of the two-spotted spider mite. However, the results indicate that secondary application would sometimes be necessary. There was no foliage damage of black Currants and strawberries by either acaricides at the concentrations used. Acknowledgment ... The authors are grateful to: Dr. R. P. pottinger, Senior Lecturer in Agricultural Zoology. Lincoln college. New Zealand. for his helpful assistance in aiding with the organization of thd field work. Department of agriculture officers for mite colonies. Mr. D. A. Slade, Technical Advisor. Fruitgrowers' Federation (now at Massey University) for his assistance and provision of mites for testing. Mr T. McRae of Timaru for permission to use his crops for field tests. The following chemical companies and I or their New Zealand agents for so readily supplying samples of acarides; Ivan Watkins-Dow Limited. Fruitgrowers Chemical Company Limited. Henry H. York & company (New Zealand). Shell Oil (New Zealand) Limited.

• 구강회복응용과학지
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• 제27권2호
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• pp.197-207
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• 2011

의치상의 첨상에 사용하는 레진의 종류가 의치상의 굴곡강도와 굴곡계수에 미치는 영향을 비교하는데 있다. 국제표준규격 제 1567 호(ISO 1567:1999)를 참고로 2 가지의 의치상용 열중합레진(Lucitone199(Dentsply Int., NewYork, USA), SR-Ivocap(Ivoclar AG, Schaan, Liechtenstein))을 이용하여 길이 64 mm ${\times}$ 폭 50 mm ${\times}$ 두께 3.3 mm 의 시편을 제작하였다. 각각의 제작된 시편을 다시 두께 2.0 mm 로 규격화한 뒤 3 종류의 레진(Lucitone199 (Dentsply), SR-Ivocap(Ivoclar), Rebase II(Tokuyama Co., Ltd, Tokyo, Japan))으로 각각 1.3 mm 의 두께로 첨상을 하였다. 제작된 시편(n=10)을 증류수가 담긴 밀폐된 용기 내에 $37^{\circ}C$에서 50 시간 동안 보관하였다. 그 후 만능시험기를 이용하여 시편의 3 점 굴곡강도와 굴곡계수를 측정하였다. 지지대간의 거리는 50 mm, crosshead speed 는 5 mm/min 였다. 측정값은 One-way ANOVA 로 비교 분석하였고, Tukey test 를 이용하여 사후 검정하였다. 열중합형 레진과 자가중합형 레진으로 첨상한 군들은 모두 첨상을 시행하지 않은 대조군보다 통계적으로 유의하게 낮은 굴곡강도와 굴곡계수를 나타났다. 본래의 의치상용 레진의 종류와 무관하게 Lucitone199 을 이용해 첨상한 군이 SR-Ivocap 을 이용한 군보다 통계적으로 유의하게 높은 굴곡강도와 굴곡계수를 보였다. 자가중합형 레진을 이용한 군은 열중합형 레진을 이용한 군 보다 통계적으로 유의하게 낮은 굴곡강도와 굴곡계수를 보였다. 의치상의 첨상 시 자가중합형 레진 보다 열중합형 레진을 이용하는 것이 우수한 기계적 성질을 보였다. 열중합형 레진을 이용한 첨상 시 본래의 의치상과 같은 종류의 레진을 사용하는 것은 의치상의 기계적 성질에 영향을 미치지 않았으며 Lucitone199 를 이용한 가압주형법에서 가장 우수한 물성을 나타냈다.

• International Journal of Human Ecology
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• 제11권1호
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• pp.23-33
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• 2010

Articles from The New York Times and magazines including Consumer Digest, Journal of Home Economics, Scholastic, Time and Woman's Home Companion were analyzed in this study and focused on the following research questions: How did the social situation influence American women's adoption of pants during World War II? How were the social opinions of women's adoption of pants? How did American women's adoption of pants and the social opinions on women's pants represent the process of change in the definition of femininity during World War II? Women were encouraged to wear pants in work places because many women had to work in defense industries and farms. Women had to wear pants during the winter to keep warm in order to conserve oil, rubber, and other materials. In addition, wearing men's clothes became a fashion trend among college women during this period. However, practicality was often not the primary thing alone to consider in women's fashion. Femininity was still important in women's fashion. There were criticisms over the women's adoption of pants. Regulations against pants were imposed on women, while there were women who wanted to dress like ladies even at defense industries. An abrupt change in women's gender roles and the increased adoption of trousers aroused social ambivalence about the traditional definition of femininity. Even though many women returned to their homes after the war, the social demand of practicality in women's day-time clothes during the war offered women the experience of comfort and practicality in pants. These experiences contributed to paving the way for more women to adopt pants and helped establishing a new definition of femininity after the war.