경량소재 적용 프론트 모듈 개발 및 제작

최현범(Hyunbum Choi),최강훈(Kanghun Choi),이상헌(Sangheun Lee),김상두(Sangdou Kim),송종호(Jongho Song),김재열(Jaeyeol Kim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11

민족과 국토, 그리고 미 -조태일의 「국토」의 경우

최현식 ( Choi Hyun-sik ) 한국문학이론과 비평학회 2005 한국문학이론과 비평 Vol.28 No.-

This article is intended to investigate an interrelationship of aestheticization of ‘national territory’, national ideal and postcolonial practice by focusing on Cho Tae-Il’s Kukto. This has an significance beyond the study on Cho Tae-Il in that it can clarify the meaning and genealogy of this theme in Korean modern history of poem. In the first place, the aestheticization of ‘national territory’ in Kukto is mediated by the combination of nature and comtemporary reality. The way that a ‘national territory’ is regarded in the same light with nature, appears in two forms. One is to show the healthiness and liveliness of ‘national territory’ by way of penetrating a social reality into the nature. The other is to imagine ‘national territory’ as ‘the suffered and oppressed land’. And one of the main themes in Kukto is a postcolonial practice, especially a resistance against the divided nation system and overcoming it. This task is accomplished in two dimensions. The first is the dimension of subjectivity in which ‘the poetics of whole body’ plays a great role. ‘A whole body’, for Cho Tae-Il, means the uniting of will and action, that’s to say, an united practice(‘flag’) of ‘love’ and ‘action’. The second is the dimension of ‘national territory’. The scenery of post-colonized ‘national territory’ is expressed by metaphors like the wind and light of Korean peninsula, a scene of ‘pottery shop’ where ‘pure minds’ play as they wishes. The ‘pottery shop’ is an example of ‘national territory’ and ‘history’ that the subject should newly recover.

PCL-MMT 나노복합재료의 기계적 성질과 생분해에 관한 연구

최현국 ( Hyun-kuk Choi ),이영세 ( Young-sei Lee ),박재경 ( Jae-kyeung Park ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.1

PCL were intercalated into organically modified MMT(PCL-MMT) at 80°C for 4hrs to prepare the PCL-MMT nanocomposite. PCL-MMT and PCL were mixed mechanically with two-roll mill at 150 ℃ for 15mins. From the results of XRD and TEM, it were found that PCL-MMT nanocomposite were prepared. And mechanical properties and biodegradation of nanocomposite have been investigated by tensile meter and biodegradability analysis experiment. Because of MMT dispersed homogeneously in PCL matrix, the Young's modulus of the nanocomposite was found to be excellent. But the tensile strength and elongation were decreased as increase of MMT. And MMT dispersed in PCL matrix was almost not affected on the biodegradation of PCL.

맥락매칭과 노출수준이 인터넷 광고의 CTR에 미치는 영향

최현식(Hyun Sik Choi),김덕영(Duck Young Kim) 한국광고홍보학회 2011 한국광고홍보학보 Vol.13 No.3

본 연구는 최근 인터넷 광고에서 활발하게 행해지고 있는 맥락 광고의 효과를 분석해 보았다. 맥락매칭 광고가 비맥락 매칭 광고에 비해 광고 효율(CTR)이 높은 것으로 나타났다. 맥락매칭 광고의 경우 일평균 노출량이 증가할수록 광고 CTR이 증가하다가 과도한 일평균 노출량에서는 오히려 CTR이 감소되는 역U자형(Inverted U-shaped)의 관계가 나타날 수도 있는 가능성이 시사되었다. 비맥락매칭 광고에서는 이와 같은 역U자형 관계의 가능성이 상대적으로 낮을 것으로 보였다. 광고 기간과 CTR과의 유의한 상관관계는 관찰할 수 없었다. The purpose of this paper is to study context-matching, the level of ad exposure that affect the CTR as one of the essential dependent variables of internet advertising. It was proved that CTR of context-matching advertising is more effective than that of non context-matching advertising. Moreover, as context-matching advertising per day increased, CTR increased; on the other hand, as context-matching advertising per day increased beyond the limit, CTR decreased, which shows an inverted U-shaped relationship. As non context-matching advertising per day increased, CTR increased; unlike the case of context-matching advertising, as non context-matching advertising per day increased beyond the limit, CTR did not decrease. In addition we failed to find the relationship found between advertising period and CTR.

정면 실차 충돌 시험 재현을 위한 모의 충돌 보정 인자에 관한 연구

최현진(Hyun-Jin Choi),이재우(Jae-Woo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In vehicle full frontal crash, NCAP is widely used as one of the evaluation method for occupant protection performance. Generally, it is performed at the sled test for improve protection performance of occupant. It is the most important to reproduce a crash test similarly for the accurate development in sled test. Also, to get a better result about development of restraint systems, correlation of crash test is needed for accuracy and reliability. Correlation reference of NCAP test is used Pcomb which is calculated by HIC and chest g's values. In this paper, it is described the correlation factors such as inertia pulse. pitching angle and vehicle intrusion to have effect reproducibility of crash test. However, due to the difficulty of the reproducibility in the sled test, these factors are evaluated by MADYMO simulation model of sled test. We studied comparison of crash test and analysis results in order to know the effect of correlation factors. So, we know that inertia pulse and pitching, vehicle intrusion are important correlation factors to reproduce crash test more similarly.

백두산절ㆍ오족협화ㆍ대동아공영론 : 그림엽서 <백두산절>의 경우

최현식 ( Choi Hyun-sik ) 민족문학사학회·민족문학사연구소 2016 민족문학사연구 Vol.61 No.-

이 글은 ‘백두산’ 관련 일본민요 <백두산절>의 기원과 형성, 전파와 유행, 그것의 다양한 변이형 및 군국가요로의 전환, 조선의 대중가요에 대한 영향, 그에 대한 조선 가요의 은밀한 거부 등에 관심을 둔다. 우에다[植田]는 조선과 만주 국경 일대의 생활상과 풍물지를 담은 「국경이백리」에서 16편에 달하는 민요 <백두산절>과 그것을 주제로 한 5편의 표현화 <백두산절>을 선보이고 있다. <백두산절>은 여성의 목소리를 빌려, 백두산과 압록강 풍물에 대한 이국적 정서, 국경생활의 고단함과 연인과의 사랑, 비적의 침입과 토벌, 일본과 천황에 대한 충성을 노래한다. 이즈음까지는 조선인 및 만주인과의 협력이 강조되기는 하지만, 국경생활 및 노래의 주체 역시 일본인에 집중된다. 국경지대서 불리던 <백두산절>은 조선 내 일본인의 가창을 거쳐 일본에서 고통스럽고 위험한 타향 생활을 대표하는 노래로 크게 유행하게 된다. 결국 <백두산절>은 아시아ㆍ태평양전쟁 시기를 통과하면서, 총력전 참여와 천황에의 멸사봉공을 다짐하는 군국가요로 변형, 확장되기에 이르며, 무려 3종 이상의 그림엽서로 제작ㆍ판매되기에 이른다. 민요와 엽서로 대표되는 유희와 친밀성의 제도는 천황파시즘과 결탁하면서, 전쟁 참여와 옥쇄를 고무하고 찬양하는 ‘타나토스’의 기호로, 또 결전(決戰)생활의 모델로 타락되는 것이다. 이런 사실을 또 다른 그림엽서와 가요의 합작품인 <조선만몽 국경수비의 노래>와 <압록강절>에서도 재차 확인함으로써, 총력전을 지향하는 노래와 그림의 ‘애국기법’의 폭력성과 허구성을 간파할 수 있었다. 한편 식민지 조선의 대중가요도 압록강과 백두산을 여러 차례 노래하는데, 조선인의 생활과도 밀접히 관련된 ‘압록강’이 쉽게 다가서기 힘든 ‘백두산’보다는 인기가 높았다. 하지만 ‘압록강’ 노래는 대체로 이별과 상실의 정한(情恨)으로 얼룩진 반면, 특히 <백두산 바라보고>는 국토(향토)에 대한 기억과 호명을 통해 조선(인)의 민족적ㆍ개인적 정체성에 대한 각성과 ‘진정한 장소성’의 새로운 발견을 수행하는 효과를 발휘하고 있다. This article is to identify the origin, formation, dissemination and popularity of 「HAKUTOSANBUSHI(SONG OF BAEKDUSAN)」, a Japanese folk song related to ``Baekdusan (Mt.)`` as well as its various variants, conversion to a militant song, and its effect on the folk songs of Chosun and secretive rejection. Ueda(植田) introduces folk song 「HAKUTOSANBUSHI」 comprised of as many as 16 pieces in GUKGYEONG IBAEKRI(國境二百里) that contains the everyday life and institutions and customs in the border area between Chosun and Manchuria and five representative paintings 「HAKUTOSANBUSHI」 that has adopted it as its theme. 「HAKUTOSANBUSHI」 sings exotic sentiment of Amnokkang scenery and customs, fatigue of living in border area, romantic love, invasion and suppression of bandits, and loyalty to Japan and its emperor with the adoption of a female voice. Up to this period, there is an emphasis placed on the cooperation between the people of Chosun and Manchuria but the life in border area and the main agent of the song are concentrated on the Japanese. 「HAKUTOSANBUSHI」that was once sung by people in border areas has gained huge popularity in Japan as a song sung by a Japanese in Chosun that expresses a painful and jeopardous life away from home. Eventually, 「HAKUTOSANBUSHI」was converted to a militant song that pledges participation in allout war and self-annihilation for the sake of the Japanese emperor during the period Pacific War, and even three or more illustrated postcards were issued based on this song. The system of play and intimacy represented by the folk song and the postcard was degraded to the symbol of ``Thanatos`` that encourages and praises participation in war and honorable death and the model of decisive war as it was combined with the emperor fascism. This was further reaffirmed by 「Song of frontier guards of Chosun ManMong」 and 「Amnokkangjeol」 that were produced in another forms of postcard and folk song, which implies the violence and fabrication of ``distorted patriotism`` expressed in songs and illustrations encouraging a l-out war. Meanwhile, the folk songs of Chosun under the Japanese colonialism have sung Amnokkang and Baekdusan multiple times, and ``Amnokkang``, which was close to the life of Chosun people was more popular than hard-to-reach ``Baekdusan``. However, the song ``Amnokkang `` is all about bitter sentiments of farewell and loss while 「Looking at Baekdusan」 sought awakening of national and personal identify as (people of) Chosun through memories and calling for national territory (homeland) with the effect of making new discoveries of ``authenticity of place``.

케이블 구조물의 기하학적 비선형을 고려한 최적 형상해석

최현식(Hyun Sik Choi),김승덕(Seung Deog Kim),이형훈(Hyung Hoon Lee) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.1

Cable structures which are a kind of lightweight soft structural system are used for spatial structures with wide span. The material property of the cable has strong axial stiffness but little bending stiffness. So cable structures are unstable structures initially. These soft structures need introducing initial stresses first because of its initial unstable state, and it happens large displacement phenomenon. To find the structural shape after large displacement cause by introducing initial stiffness, we need the shape analysis considering geometric nonlinearity in structural design procedure. In this study, we will derive the nonlinear finite element formula for cable members considering geometric nonlinearity, and develope a computer program for the shape analysis using the tangent geometric equations. Results of some numerical studies are showing the developed analytic program is reliable.

노인 인구군에서의 피부질환 분포 , 특성 및 피부관리에 대한 역학적 연구

최현철(Hyun Chul Choi),오칠환(Chil Hwan Oh) 대한피부과학회 1993 대한피부과학회지 Vol.31 No.4

Background : With the development of medical science and technology, the proprotion of the aged has been significantly increasecl. Therefore it needs to be studied the fuadamental epidemiologic survey of dermatologic diseases and akin care in the elderly. Object : Our purpose was to provide clinically relevant data regaring both dermatologic diseases and skin care in the aged population. Methods : Total 172 volunteers aged 51 to 90 were enrolled in a study of 32-item questionnaire and total cutaneous examination. Results : The sex ratio of male to female of 172 elderly volunteers as 1:1.4 and population of 7th and 8th decades occupied 76.5% with their mean age 74.4. The dermatologic findings which showed higher incidence in this study were seborrheic keratosis, senile lentigines, xerosis, cherry angioma, and generalized pruritus. Through the interviews of 172 elderly, the mot fequent dermatologic complaint was generalized pruritus. As the mean age of the population increasec, the number of the population showing xerosis and complaing of pruritus was elevated(r=0.976. 0.917 respectively). And there was a significant stastical correlation between the finding of xerosis and the the presence of pruritus(P<0.005). Conclusion : This study suggests that dermatologic problems in the elilerly are very common ancl further dermatologic studies including substantial medical care will be needed. (Kor J Dermatol 1993;31(4):459-464)

영역별 화소값 분석을 통한 흉부 X선 오픈 데이터셋 품질 평가

최현진 ( Hyeon-jin Choi ),배수빈 ( Su-bin Bea ),선주성 ( Joo-sung Sun ),이정원 ( Jung-won Lee ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.1

인공지능의 발전으로 의료영상 분야에서 딥러닝 기반 질병 진단 연구가 활발하다. 그러나 모델개발 시 학습 데이터의 개수와 품질은 매우 중요한데, 의료 분야 특성상 접근 가능한 데이터셋이 적으며 오픈 데이터셋은 서로 다른 기관에서 배포되거나 웹상에서 수집된 것으로 진단에 적합한 품질을 기대하기 어렵다. 또한, 기존 연구는 데이터셋이 학습에 적합한지에 대한 품질검증 없이 사용한다. 따라서 본 논문에서는 임상에서 사용하는 화질 평가 요소에 근거를 두고 영역별 화소값 분석을 통한 흉부 X선 영상 품질 평가 기법을 제안한다. 오픈 데이터셋 JSRT, Chest14와 국내 A 병원 데이터셋 AUH에 제안한 기법을 적용한 결과 민감도 91.5%, 특이도 96.1%의 우수한 성능을 확인하였다.

리튬/공기 이차전지의 충방전 특성과 사이클 특성에 미치는 탄소의 영향 고찰

최현아 ( Hyun A Choi ),고보경 ( Bo Kyung Ko ),심상은 ( Sang Eun Shim ),백성현 ( Sung Hyeon Baeck ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.4

Three different carbon blacks (Vulcan, Ketjen Black, and 1:1 mixture of the two) are used as cathode catalysts for a lithium/air secondary battery, and their electrochemical properties are investigated. The surface morphology change after discharge is examined using scanning electron microscopy (SEM), and the discharge products are analyzed using Fourier transform-infrared spectroscopy (FT-IR). In order to measure the electrochemical properties, the charge and discharge measurements are conducted at a constant current density of 0.2 mA/cm2, which monitors the voltage change. Electrochemical impedance spectroscopy (EIS) analyses are also performed in order to examine the change in the charge transfer resistance during the charge-discharge process. Compared with both the Ketjen black and Vulcan, the 1:1 mixture of the two carbon blacks exhibits the best performance as a cathode for the Li/air secondary battery, which results from a synergistic effect that exploits-both carbon blacks.