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임성훈,윤현식,유제황,문종현,박규창,장진,문병연,Lim Sung Hoon,Yun Hyun Sik,Ryu Je Hwang,Moon Jong Hyun,Park Kyu Chang,Jang Jin,Moon Byeong Yeon 한국진공학회 2005 Applied Science and Convergence Technology Vol.14 No.4
We report on the field emission properties from vertically aligned carbon nanotubes (CNTs) produced by a triode PECVD with a SiNx capping layer on metal catalyst. It is found that the CNTs density can be controlled by the capping layer thickness and decreases with increasing SiNx thickness. The CNT density of $\~$ 104/$cm^{2}$ exhibited highest electron emission characteristics, the threshold field of 1.2 V/$\mu$m and the current density of 0.17 mA/$cm^{2}$ at 3.6 V/$\mu$m. We have carried out investigation of electron emission stability under ambient gas of N2. The electron emission stability was improved with decreasing CNT density. Under $1\times$$10^{-5}$ Torr ambient pressure, the CNTs in 5 $\mu$m hole show electron emission current higher than $1\times$$10^{-4}$ A/cm2 and it's electron emission uniformity has $2\%$.
임성훈,강예묵,이달원,Lim, Seong Hun,Kang, Yea Mook,Lee, Dal Won 충남대학교 농업과학연구소 1998 Korean Journal of Agricultural Science Vol.25 No.2
선행하중공법과 병행하여 연직배수재를 설치한 연약지반에서 초기에 신뢰성 있는 최종 침하량을 예측할 수 있는 방법을 확립하기 위하여, 실측자료를 이용한 역해석에 의해서 점증재하와 일시재하로 고려하여 Curve fitting 방법으로 역해석한 결과를 비교분석하고, 쌍곡선방법, Tan의 방법, Asaoka방법, Monden방법등으로 예측한 최종침하량과 비교하여 다음과 같은 결론을 얻었다. 1. 점증재하로 성토된 연약지반에 대해서 일시재하와 점증재하에 의한 예측 침하곡선이 일치하는 시간은 성토개시일로부터 성토기간의 약 2배 정도의 시간이 경과한 이후로 나타났다. 2 연직 드레인이 타입된 지반에 대해서 쌍곡선 방법, Tan의 방법, Asaoka방법, Monden방법, Curve fitting I, Curve fitting II(simple), 그리고 Curve fitting II(Carrillo)방법에 의하여 해석한 결과, Curve fitting II(simple) 방법을 기준으로할 때, 쌍곡선방법은 26~55%정도 과다추정되었고, Tan의 방법은 6~20%정도 과대 추정되었고, Monden방법은 Tan의 방법과 유사하게 나타났으며, Curve fitting I방법과 Asaoka방법은 최대 10%의 차이를 나타내었다. 3. 역해석에 의해서 최종침하량을 예측할 경우에 Asaoka 방법, 일시재하에 의한 Curve fitting I방법, 점증재하에 의한 Curve fitting II방법 등을 사용하는 것이 적합하다고 판단된다.
임성훈 한국방송·미디어공학회 2020 방송과 미디어 Vol.25 No.2
최근 스마트폰에서의 증강현실, 미적 효과의 증대(예, 라이브 포커싱) 등의 어플리케이션을 제공하기 위해 모바일 기기에서의 3차원 공간 복원 기술에 대한 관심이 증가하고 있다. 소비자들의 요구에 발 맞춰 최근 스마트폰 제조사는 모든 플래그십 모델에 다중 카메라 및 뎁스 센서(거리 측정 센서)를 탑재하는 추세이다. 본 고에서는 모바일 폰에 탑재되고 있는 대표적인 세 축의 뎁스 추정(공간 복원) 방식에 대해 간단히 살펴보고, 최근 심층학습(Deep learning)의 등장으로 기술 발전의 새로운 국면에 접어 든 다중 시점 매칭(Multi-view stereo) 방법에 대해 소개하고자 한다. 심층 신경망이 재조명 받은 2012년 전까지 주류 연구 방향이었던 전통 기하학 기반의 방법에 대한 소개를 시작으로 심층 신경망기반의 방법론으로의 발전된 형태를 살펴본다. 또한, 신경망기반의 방법론은 크게 3 세대로 나누어 각 세대별 특징에 대해 자세히 살펴보고, 다양한 데이터에 대한 실험 결과를 통해 세대별 공간 복원 결과를 비교 분석한다.
강섬유 혼입률에 따른 고강도 콘크리트의 휨 크리프 특성
임성훈,김동휘,윤현도 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 논문집 Vol.24 No.2
In this paper, the flexural creep behavior of hooked-end steel fiber reinforced high-strength concrete was evaluated to investigate the steel fiber content influence on long-term behavior of flexural members. An experimental program consisted of nine prismatic beam specimens with dimensions of 150 × 150 × 600mm reinforced with different contents of steel fiber (0, 0.75 and 1.5% at the volume fraction). To introduce flexural creep loading to notched prismatic beam specimens, a four-point bending test setup was used. The sustained load with 40% of the flexural strength was applied by means of a lever system and controlled by a load cell for 90 days. During sustained loading, crack mouth opening displacement (CMOD) was monitored. Conventional flexural test after creep tests were carried out to evaluate the residual capacity of each specimen. Test results showed that steel fiber content has a significant effect on the flexural creep behavior of high-strength concrete and long-term flexural load with 40% of flexural strength doesn’t generate negative effects on the residual capacity of steel fiber reinforced high-strength concrete. 이 논문에서는 섬유의 혼입량에 따른 휨부재의 장기거동에 대한 영향을 평가하기 위하여 후크형 강섬유로 보강된 고강도 콘크리트의 휨 크리프 거동에 대한 평가가 이루어졌다. 실험은 150 x 150 x 600mm 크기를 갖는 섬유 혼입량(0, 0.75 및 1.5%)을 변수로 하는 6개의 휨 시험체를 대상으로 하였다. 노치를 갖는 휨 시험체에 휨 크리프 하중을 도입하기 위하여 4점 가력 휨 시험장치가 활용되었다. 휨강도의 40%인 크리프 재하하중은 레버 장치를 활용하여 도입되었고 90일 동안 도입된 하중은 로드셀에 의해 제어되었다. 크리프 하중의 도입시, 시험체 중앙부에 설치된 노치의 균열개구변위(CMOD)가 측정되었다. 크리프 시험후 각 시험체 대한 휨시험을 실시하여 각 시험체의 잔여강도를 평가하였다. 이상과 같은 실험결과로부터 섬유 혼입량은 고강도 콘크리트의 휨 크리프 거동에 주요한 영향을 끼치고 휨강도의 40% 범위내의 지속하중은 섬유보강된 고강도 콘크리트의 잔여강도에 부정적인 영향을 끼치지 않았다.
현대건축에서 ‘캐릭터’ 개념의 적용 가능성에 관한 연구
임성훈 대한건축학회지회연합회 2021 대한건축학회연합논문집 Vol.23 No.5
Since the perspective of architecture began to be divided after 18th century, the gap between technology and architecture in modern architecture has been further expanded, and today, environmental issues have created another trend in architecture, the separation is accelerating. Now, in architecture, rather than the diversification, integration has emerged, and this trend has become a topic of discussion in Korea through the Seoul Biennale of Urban Architecture held in 2017. This thesis, in pursuing integration, examines the ‘character’ an architectural concept used in the past, and through this concept, the relationship between technology and architecture through the prospect that the intersection between technology and architecture and its meaning can be found. Through this discussion, I would like to show that it is possible to reexamine the relationship between technology and architecture.
임성훈,강병윤,김기완,구자호,강신익,차흥윤,정재현,조준호,김기수 한국지반공학회 2010 한국지반공학회논문집 Vol.26 No.5
In this study, the seepage flow monitoring method by the hydraulic head loss rate was developed for the purpose of application to offshore construction site enclosed by cofferdams in which seepage force varies periodically. The amount of the hydraulic head loss rate newly defined in this graph was in a range between 0 and 1. The zero of the rate means the existence of flow with no seepage resistance. The 1 of the rate means no seepage flow through the ground. The closer to 1 the coefficient of determinant in the hydraulic head loss graph is, the more the ground through which seepage water flows is stable. The closer to 0 the coefficient of determinant in the hydraulic head loss graph is, the more the ground through which seepage water flows was unstable and the higher the possibilities of existence of empty space or of occurrence of piping on the seepage flow pass in the ground is. The hydraulic head loss graph makes it possible to monitor sensitively the situation of seepage flow state, and the graph helps to understand easily the seepage flow state at the specific section on the whole cofferdam.
임성훈,정성봉 韓國實科敎育硏究學會 2001 실과교육연구 Vol.7 No.1
The purpose of this study was to investigate the relationship of learner's field-independent and field-dependent cognitive styles and academic achievement in practical arts. For this purpose, 4∼6th grade 569 students of Y elementary school in seoul were sampled. And tested cognitive styles and practical arts academic achievement. Learner's cognitive styles were divided into two categories through cognitive styles tests ; field-independent cognitive styles(above mean scores), field-dependent cognitive styles(below mean scores). In order to verify the result of this study, t-test were used as a statistical method. The meaningful level was less than .05. The results of this study were as follows, (1)The field-independent students showed significantly higher scores of manipulation than the field dependent group in 4th, 5th, and 6th grade students(4th grade P<.01, 5th grade P<.01, 6th glade P<.05). (2)The field-independent students showed significantly higher scores of making than the field dependent group in 4th, 5th, and 6th grade students(4th grade P<.001, 5th grade P<.001, 6th glade P<.01). (3)The field-independent students showed significantly higher scores of cultivation than the field dependent group in 4th, 5th, and 6th grade students(4th glade P<.01, 5th grade P<.001, 6th grade P<.05). (4)The field-independent students showed significantly higher scores of management than the field dependent group in 4th, 5th grade students(4th grade P<.001, 5th glade P<.001). but No significance in 6th grade student. These results showed that the field-independent students had higher academic achievement than the field-dependent students in practical arts.