코혹의 크기에 따른 매부리코 교정술

신동혁,김수영,엄기일,이수향,김순흠,하승일,김진중,최현곤 대한미용성형외과학회 2008 Archives of Aesthetic Plastic Surgery Vol.14 No.1

Nose is the most three dimensional structure located on the central portion of the face. Therefore, the nasal shape is one of the most important factors on deciding upon one's impression. Hump-nose is characterized by nasal hump, acute tip angle, drooping or/and under-projection of tip, and broad nasal dorsum. Because of these characteristics, recently more patients with hump-nose are inclined to correct their problematic nose. The purpose of this study was to classify hump-nose according to hump size and provide proper operating methods in each group. From August 2003 to August 2005, in 46 cases, we classified the hump nose into three groups, small(group A; n=30), medium(group B; n=6), and large(group C; n=10) in accordance with size and location of hump and in each group we effectively corrected the hump with our proper operating methods. In the large group, one case of tension nose temporarily appeared but soon improved and we obtained satisfactory results in the other cases.

8090 Al - Li 합금의 초소성

신동혁,하종신,신영호 대한금속재료학회 1991 대한금속재료학회 학술대회 개요집 Vol.1991 No.1

DC 법으로 주조한 Al-10 wt.%Si-2 wt.%Cu-1 wt.%Mg-0.5 wt.%Mn 합금의 균질화

신동혁,유재은,장준연,고흥석,문인기 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.8

Microstructure of a direct chill casted Al-10 wt.%Bi-2 wt.%Cu-1 wt.%Mg-0.5 wt.%Mn alloy φ180×2000 ㎜ in size was carefully investigated on the subsequent process after casting in order to search the optimum process condition suitable for mass production. Both the chemical modification by adding Sr into the melt and the rapid cooling rate by employing direct chill easting result in homogeneous cast structure consisting of primary Al and modified fine eutectic Si in spite of a large size of the ingot. The formation of ternary eutectics leads the segregation of CuMgAl₂ phase mainly in the center of the ingot. DSC reveals that ternary eutectics dissolves into the matrix around 520℃. The separation of network-structured fibrous eutectic Si to fine particle is found after one-hour heating above 460℃. Proper heat treatment causes equiaxed fine Si particle with the size of 10 ㎛ and complete dissolution of segregated CuMgAl₂ phase. Coarsening of separated Si particle is governed by diffusion controlled growth.

가습기 살균제 소비자 피해사건 관련 뉴스프레임의 변화

신동혁,여기봉 한국환경사회학회 2016 한국환경사회학회 학술대회 자료집 Vol.2016 No.10

Structure determination of biological macromolecular complexes by small-angle X-ray scattering (SAXS) combined with validating tools

신동혁,한승수,이상호 한국구조생물학회 2016 Biodesign Vol.4 No.1

The molecular world in a cell is operated by the action of biological macromolecular complexes in solution. The past coupleof decades have witnessed an incredible advance in our understanding of atomic details of biological macromolecularcomplexes, mainly driven by X-ray crystallography. Despite the wealth of structural information, crystallographic structuredetermination of the biological complexes still remains challenging mostly because such complexes often resist to becrystallized. Small-angle X-ray scattering (SAXS) is emerging as an alternative to provide structural information for thebiological macromolecular complexes at low resolution in solution. SAXS is advantageous in that it does not requirecrystalline state of the complexes and that multiple conformational states and/or conformational changes can be observedin solution. Combined with pre-existing high-resolution structures of components of the macromolecular complexes, SAXScan be used to build a testable molecular model for the complex. The structural model driven by the SAXS data can thenbe validated by biophysical, biochemical and cellular techniques. Here we attempt to review recent advances in applicationof SAXS to uncover the molecular basis of macromolecular complexes. Such a hybrid approach equipped with SAXS andcomplementary validation tools may be proven useful to obtain structural insights into the function of biological complexeswhen no high-resolution structure determination techniques such as crystallography, NMR and electron microscopy areapplicable.

자유곡면 볼 엔드밀 가공에서 절삭력을 고려한 이송량 최적화 알고리즘

신동혁,주종남 한국정밀공학회 2003 한국정밀공학회 학술발표대회 논문집 Vol.2003 No.10월

7475 Al 및 5083 Al 합금의 초소성 변형

신동혁,주연준,맹선재 ( Dong Hyuk Shin,Yeon Jun Joo,Sun Chae Maeng ) 대한금속재료학회 ( 구 대한금속학회 ) 1997 재료강도 심포지엄 Vol.- No.-

공공부문의 건설공사 안전관리 개선방향에 관한 연구

신동혁,이명구,윤영근,오태근 한국안전학회 2019 한국안전학회지 Vol.34 No.5

Various safety measures have been established and implemented in order to reduce construction accidents. However, statistics data on at construction sites still show higher accident and mortality rates than other industries. As a result of investigating the causes of accidents occurring in the construction industry, most accidents resulted from the failure of the system. Therefore, the existing safety management system of the construction site is monitored so that it operates properly in the field, and it is an important factor to actively participate in construction work. In order to overcome this, the government emphasized on-site inspections and planning and implementation confirmation by public institutes to ensure the effectiveness of the safety management system through amendment of the Construction Technology Promotion Act, but the orderer' safety capability and manpower are insufficient at present. Therefore, in this study, the safety management system, such as design for safety, safety management plan, safety check, safety management cost, etc. specified in the Construction Technology Promotion Act, is regularly checked and confirmed to improve the effectiveness of the safety management system as well as to improve the safety management system of the construction site by deriving measures to strengthen the public function of the government.

중·고등학교 과학 교과서에 제시된 볼타전지에 대한 문제점 분석

신동혁,이상권,최병순,Sin, Dong-Hyeok,Lee, Sang-Gwon,Choe, Byeong-Sun 대한화학회 2002 대한화학회지 Vol.46 No.4

이 연구의 목적은 중${\cdot}$고등학교 교과서에 제시된 볼타전지에 대한 문제점을 분석하여 개선 방안을 제시하는데 있다. 이를 위하여 과학 교과서 중 관련 단원 내용을 분석하였으며 추출한 문제점을 실험을 통해 해결하였고 이를 바턍으로 교과서의 개선 방향을 제안하였다. 교과서 분석 결과, 화학전지의 작용 여부를 확인하는 방법, 아연판에서 수소 기체가 발생하는 이유에 대한 설명, 기전력에 대한 실험연구 결과, 전극용어 사용의 통일, 전류에 대한 설명 등 에 문제점이 있었다. 이러한 문제점을 해결하기 위한 방안을 제시하였다. 기전력에 대한 실험연구 결과, 기전력 측정 값에 대한 과학적인 설명은 각 전극에서의 산화환원 반응에 대한 기전력과 표준 환원 전위, 전기음성도, 일함수, 이온화 에너지 등과 같은 전극의성질을 함께 고려하여 설명해야 함을 알 수 있었다. 이는 볼타전지의 기전력이 여러 가지 요인에 영향을 받기 때문이다. 이와 같이 볼타전지의 기전력에 대한 정확한 설명은 용이 하지 않으므로 볼타전지는 화학전지의 도입 부분에서 역사적으로만 간단하게 기술하고 개념 설명은 다니엘 전지를 이용하여 기술하는 방향으로 교과서를 개선 할 것을 제한하였다. The purpose of this study was to improve the problems of the voltaic cell described in the science textbooks of secondary schools. For this purpose, the contents of science textbooks which are related to the voltaic cell were analyzed and the problems which were not explained clearly by theorems were tried to be explained by experiments, and lastly sug-gestions were made toward the improvements regarding the voltaic cell in the science textbooks. The findings are that there are problems on the ways of ensuring whether the voltaic cell operates properly as a chemical battery, on the explanation of why the hydrogen bubbles form at the zinc electrode, on the cell potential, on the unification of the electrode terminology used, and on the mention of the current. Solutions to the problems except the cell potential were suggested. According to the experiment, the theoretical potential was calculated by considering the potentials of redox reactions at the two electrodes of the cell and by taking into account the characteristics of the electrodes such as the work function, ionization energy, stan-dard reduction potential, and electronegativity.The cell potential of the voltaic cell is explained by several factors. In the improved version of the textbook's introduction section to the voltaic cell, it is necessary to describe the voltaic cell his-torically.For the conceptual section, it should be explained in terms of the Daniel cell.

전자에너지손실분광법(EELS)을 이용한 $YBa_2Cu_3O_{7-\delta}$ 고온초전도체 쌍결정 경계에서의 산소 조성변화 연구

신동혁,S. E. Babcock 한국진공학회 1995 Applied Science and Convergence Technology Vol.4 No.2

2-3nm의 공간분해능을 갖는 전자에너지손실분광법(Electron Energy Loss Spectroscopy, EELS)을 이용하여, 전기적 특성조사된 YBa2Cu3O7-$\delta$ 고온초전도체 쌍결정의 결정경계(grain boundary)에서 산소의 조성변화를 조사하였다. Misorientation angle이 $14^{\circ}$, $28^{\circ}$,$ 30^{\circ}$인 3개의 쌍결정 중에서 Josephson junction 특성을 보인 $28^{\circ}$ 및 $30^{\circ}$결정경계에서의 oxygen 1s absorption edge는 결정내부에서의 oxygen 1s absorption edge와 매우 다름을 알 수 있었다. 이는 결정경계에서의 산소조성이 결정내부에 비해 낮음을 의미하며, 그 영역이 결정경계 부근 20-40nm로, coherence length에 비해 큼을 알 수 있다. 반면에, flux pinningxmr성을 보인 $14^{\circ}$결정경계에서의 oxygen 1s absorption edge는 결정내부에서와 별 차이를 보이지 않았다. 따라서 일반적으로 관찰되어온, misorientation angle이 큰 결정경계에서의 Josephson junction 특성은 결정경계 부근에서 산소의 조성이 낮아지는데에 기인하며, 그 원인은 결정경계면을 통해 산소가 out-diffusion되기 때문인 것으로 생각된다.