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      • SCOPUSSCIEKCI등재

        New bimaxillary orthognathic surgery planning and model surgery based on the concept of six degrees of freedom

        Jaeho Jeon,Yongdeok Kim,Jongryoul Kim,Heejea Kang,Hyunjin Ji,Woosung Son 대한치과교정학회 2013 대한치과교정학회지 Vol.43 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The aim of this paper was to propose a new method of bimaxillary orthognathic surgery planning and model surgery based on the concept of 6 degrees of freedom (DOF). A 22-year-old man with Class III malocclusion was referred to our clinic with complaints of facial deformity and chewing difficulty. To correct a prognathic mandible, facial asymmetry, flat occlusal plane angle, labioversion of the maxillary central incisors, and concavity of the facial profile, bimaxillary orthognathic surgery was planned. After preoperative orthodontic treatment, surgical planning based on the concept of 6 DOF was performed on a surgical treatment objective drawing, and a Jeon’s model surgery chart (JMSC) was prepared. Model surgery was performed with Jeon’s orthognathic surgery simulator (JOSS) using the JMSC, and an interim wafer was fabricated. Le Fort I osteotomy, bilateral sagittal split ramus osteotomy, and malar augmentation were performed. The patient received lateral cephalometric and posteroanterior cephalometric analysis in postretention for 1 year. The follow-up results were determined to be satisfactory, and skeletal relapse did not occur after 1.5 years of surgery. When maxillary and mandibular models are considered as rigid bodies, and their state of motion is described in a quantitative manner based on 6 DOF, sharing of exact information on locational movement in 3-dimensional space is possible. The use of JMSC and JOSS will actualize accurate communication and performance of model surgery among clinicians based on objective measurements.

      • SCOPUSSCIEKCI등재

        New bimaxillary orthognathic surgery planning and model surgery based on the concept of six degrees of freedom

        Jeon, Jaeho,Kim, Yongdeok,Kim, Jongryoul,Kang, Heejea,Ji, Hyunjin,Son, Woosung The Korean Association Of Orthodontists 2013 대한치과교정학회지 Vol.43 No.1

        The aim of this paper was to propose a new method of bimaxillary orthognathic surgery planning and model surgery based on the concept of 6 degrees of freedom (DOF). A 22-year-old man with Class III malocclusion was referred to our clinic with complaints of facial deformity and chewing difficulty. To correct a prognathic mandible, facial asymmetry, flat occlusal plane angle, labioversion of the maxillary central incisors, and concavity of the facial profile, bimaxillary orthognathic surgery was planned. After preoperative orthodontic treatment, surgical planning based on the concept of 6 DOF was performed on a surgical treatment objective drawing, and a Jeon's model surgery chart (JMSC) was prepared. Model surgery was performed with Jeon's orthognathic surgery simulator (JOSS) using the JMSC, and an interim wafer was fabricated. Le Fort I osteotomy, bilateral sagittal split ramus osteotomy, and malar augmentation were performed. The patient received lateral cephalometric and posteroanterior cephalometric analysis in postretention for 1 year. The follow-up results were determined to be satisfactory, and skeletal relapse did not occur after 1.5 years of surgery. When maxillary and mandibular models are considered as rigid bodies, and their state of motion is described in a quantitative manner based on 6 DOF, sharing of exact information on locational movement in 3-dimensional space is possible. The use of JMSC and JOSS will actualize accurate communication and performance of model surgery among clinicians based on objective measurements.

      • KCI등재

        The Acquisition of Vocabulary through Negotiated Interaction with AI Chatbots

        Jaeho Jeon 한국초등영어교육학회 2020 초등영어교육 Vol.26 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        This study explores how learners acquire vocabulary through chatbots according to interactive task type. Two groups were created: 1) the balanced group which performed a responsive interaction task and a proactive interaction task and 2) the input-based group which only performed two responsive interaction tasks. During the responsive interaction task, learners took on the role of target word receiver while interacting with a chatbot. For the proactive interaction task, the roles of chatbot and learner were reversed. Based on the topic “Where is the post office?”, an interactive chatbot was designed, learner and chatbot interaction data was analyzed, and the results of the two groups’ post and delayed tests were quantitatively compared in terms of vocabulary acquisition. The following conclusions were drawn. First, different types of negotiation were observed depending on task type. Second, both groups effectively acquired receptive vocabulary knowledge. Lastly, the learners effectively acquired productive vocabulary knowledge. The balanced group outperformed the input-based group in the acquisition of productive knowledge because the output element for target vocabulary in the proactive task affected its effectiveness. This study shows the potential for chatbots to be used as learning tools for vocabulary acquisition as well as speaking or writing practice tools.

      • SCISCIESCOPUS

        Effect of the Laser-Scribing on Spalling of a Single Crystalline Si Using Electrodeposition Assisted Stripping (EAS) Process

        Jeon, Jaeho,Yu, Sungkuk,Yang, Changyol,Jin, Sanghyun,Roh, Jiwon,Jung, Jaehak,Yoo, Bongyoung American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.10

        <P>The single crystalline Si comprises a large proportion of the solar cell overall cost. Lowering its cost is directly related to the cost-reduction in the solar cell. Previously, electrodeposition assisted stripping (EAS) process was employed to obtain a thin Si substrate by applying the high tensile stress on top of Si wafer, which induced the delaminating behavior of thin Si layer. Such a high stress can induce by depositing a Ni layer onto the Si substrate. This stripping phenomenon occurred at the position where the maximum shear stress is applied, which is not on the Si surface but at a certain distance below the Si surface. This research aims to precisely control the initiation point of stripping the thin Si layer by generating intentional micro-cracks on the side of Si wafer. The pre-crack was created by a laser scribing on the side of Si wafer. Also, the process parameters which affected the thickness of stripped Si layer were systematically investigated.</P>

      • SCISCIESCOPUS

        Controlling Grain Size and Continuous Layer Growth in Two-Dimensional MoS<sub>2</sub> Films for Nanoelectronic Device Application

        Jeon, Jaeho,Jang, Sung Kyu,Jeon, Su Min,Yoo, Gwangwe,Park, Jin-Hong,Lee, Sungjoo IEEE 2015 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol.14 No.2

        <P>We report that control over the grain size and lateral growth of monolayer MoS2 film, yielding a uniform large-area monolayer MoS2 film, can be achieved by submitting the SiO2 surfaces of the substrates to oxygen plasma treatment and modulating substrate temperature in chemical vapor deposition (CVD) process. Scanning electron microscopy and atomic force microscopy images and Raman spectra revealed that the MoS2 lateral growth could be controlled by the surface treatment conditions and process temperatures. Moreover, the obtained monolayer MoS2 films showed excellent scalable uniformity covering a centimeter-scale SiO2/Si substrates, which was confirmed with Raman and photoluminescence mapping studies. Transmission electron microscopy measurements revealed that the MoS2 film of the monolayer was largely single crystalline in nature. Back-gate field effect transistors based on a CVD-grown uniform monolayer MoS2 film showed a good current on/off ratio of similar to 10(6) and a field effect mobility of 7.23 cm(2)/V.s. Our new approach to growing MoS2 films is anticipated to advance studies of MoS2 or other transition metal dichalcogenide material growth mechanisms and to facilitate the mass production of uniform high-quality MoS2 films for the commercialization of a variety of applications.</P>

      • Layer-controlled CVD growth of large-area two-dimensional MoS2films

        Jeon, Jaeho,Jang, Sung Kyu,Jeon, Su Min,Yoo, Gwangwe,Jang, Yun Hee,Park, Jin-Hong,Lee, Sungjoo The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.5

        <P>In spite of the recent heightened interest in molybdenum disulfide (MoS2) as a two-dimensional material with substantial bandgaps and reasonably high carrier mobility, a method for the layer-controlled and large-scale synthesis of high quality MoS2 films has not previously been established. Here, we demonstrate that layer-controlled and large-area CVD MoS2 films can be achieved by treating the surfaces of their bottom SiO2 substrates with the oxygen plasma process. Raman mapping, UV-Vis, and PL mapping are performed to show that mono, bi, and trilayer MoS2 films grown on the plasma treated substrates fully cover the centimeter scale substrates with a uniform thickness. Our TEM images also present the single crystalline nature of the monolayer MoS2 film and the formation of the layer-controlled bi- and tri-layer MoS2 films. Back-gated transistors fabricated on these MoS2 films are found to exhibit the high current on/off ratio of 10(6) and high mobility values of 3.6 cm(2) V(-1) s(-1) (monolayer), 8.2 cm(2) V(-1) s(-1) (bilayer), and 15.6 cm(2) V(-1) s(-1) (trilayer). Our results are expected to have a significant impact on further studies of the MoS2 growth mechanism as well as on the scaled layer-controlled production of high quality MoS2 films for a wide range of applications.</P>

      • Epitaxial Synthesis of Molybdenum Carbide and Formation of a Mo<sub>2</sub>C/MoS<sub>2</sub> Hybrid Structure <i>via</i> Chemical Conversion of Molybdenum Disulfide

        Jeon, Jaeho,Park, Yereum,Choi, Seunghyuk,Lee, Jinhee,Lim, Sung Soo,Lee, Byoung Hun,Song, Young Jae,Cho, Jeong Ho,Jang, Yun Hee,Lee, Sungjoo American Chemical Society 2018 ACS NANO Vol.12 No.1

        <P>The epitaxial synthesis of molybdenum carbide (Mo<SUB>2</SUB>C, a 2D MXene material) <I>via</I> chemical conversion of molybdenum disulfide (MoS<SUB>2</SUB>) with thermal annealing under CH<SUB>4</SUB> and H<SUB>2</SUB> is reported. The experimental results show that adjusting the thermal annealing period provides a fully converted metallic Mo<SUB>2</SUB>C from MoS<SUB>2</SUB> and an atomically sharp metallic/semiconducting hybrid structure <I>via</I> partial conversion of the semiconducting 2D material. Mo<SUB>2</SUB>C/MoS<SUB>2</SUB> hybrid junctions display a low contact resistance (1.2 kΩ·μm) and low Schottky barrier height (26 meV), indicating the material’s potential utility as a critical hybrid structural building block in future device applications. Density functional theory calculations are used to model the mechanisms by which Mo<SUB>2</SUB>C grows and forms a Mo<SUB>2</SUB>C/MoS<SUB>2</SUB> hybrid structure. The results show that Mo<SUB>2</SUB>C conversion is initiated at the MoS<SUB>2</SUB> edge and undergoes sequential hydrodesulfurization and carbide conversion steps, and an atomically sharp interface with MoS<SUB>2</SUB> forms through epitaxial growth of Mo<SUB>2</SUB>C. This work provides the area-controllable synthesis of a manufacturable MXene from a transition metal dichalcogenide material and the formation of a metal/semiconductor junction structure. The present results will be of critical importance for future 2D heterojunction structures and functional device applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2018/ancac3.2018.12.issue-1/acsnano.7b06417/production/images/medium/nn-2017-064177_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b06417'>ACS Electronic Supporting Info</A></P>

      • CPS 기반 디지털 트윈 모델링 및 시뮬레이션 기술

        전재호(Jaeho Jeon),강성주(Sungjoo Kang),정성일(Sungil Jeong),전인걸(Ingeol Chun) 대한산업공학회 2018 대한산업공학회 춘계학술대회논문집 Vol.2018 No.4

        최근 ICT 기술의 발전을 통한 생산시스템의 디지털화는 제조 페러다임을 변화시키고 "디지털 트윈"이라는 새로운 개념을 제시하고 있다. 제조생산시스템은 크게 IT(Information Technology) Systems와 OT(Operation Technology) Systems로 구분이 되는데, 디지털 트윈의 등장으로 제조 라이프사이클 전반에 걸쳐 정교하고 정확한 모델(Model)을 만드는 작업은 매우 중요하게 대두되고 있다. 본 논문에서는 디지털 트윈 구현을 위한 CPS 기반 디지털트윈 모델링 및 시뮬레이션 기술을 제시한다. The recent digitization of production system through the development of ICT technology changes the manufacturing paradigm and suggests a new concept called "digital twin". Manufacturing production systems are divided into Information Technology (IT) Systems and Operation Technology (OT) Systems. The emergence of digital twinning makes it very important to create sophisticated and accurate models throughout the manufacturing lifecycle have. In this paper, CPS based digital twin modeling and simulation technology for digital twin implementation is presented.

      • KCI등재

        한국의 민주화 이행에서 김대중의 역할 1980~1987년

        전재호 ( Jeon Jaeho ) 민주화운동기념사업회 한국민주주의연구소 2016 기억과 전망 Vol.0 No.35

        이 글은 한국의 민주화 이행에 참여했던 여러 세력 중 정치사회의 역할이 과소평가되었다는 문제의식에서, 정치사회의 가장 대표적인 인물이던 김대중의 역할을 고찰했다. 그는 군부 권위주의 정권에 의해 많은 탄압을 받았음에도 불구하고, 1980년대 국내외에서 한국의 민주화를 위해 많은 활동을 전개했다. 김대중은 1982년 12월 미국으로 추방된 이후 언론과의 인터뷰 및 대중 강연을 통해 군부 권위주의 정권을 지원하는 레이건 정부의 대한 정책을 비판했고, 한국 민주화운동에 대한 미국인들의 지지를 호소했다. 그의 활동은 한국의 민주화를 지지하는 미국 언론과 의원들이 레이건 정부에 압력을 넣도록 만들었다. 이는 직간접적으로 레이건 정부의 대한정책 및 민주화운동에 대한 전두환 정권의 정책에도 영향을 미친 것으로 보인다. 1985년 2월 귀국 후 김대중은 김영삼과 함께 직선제 개헌 투쟁을 주도했다. 그는 민주화를 위해서는 참여 세력 모두의 연합을 통한 민주화운동의 구심체 형성과 중산층 및 미국의 지지가 필요하다고 판단했다. 그래서 참여세력들의 연합을 위해 노력하는 한편, 학생운동 및 사회운동의 급진성을 비판하면서 비폭력, 비용공, 비반미의 3비 원칙을 주장했다. 결국 김대중의 의도대로 1987년 민주화운동에 참여했던 대부분의 세력이 국민 운동본부로 결집했고, 직선제 개헌 구호를 통해 중산층이 대거 참여하면서 1987년 6월 민주항쟁은 승리했다. 비록 정치사회의 분열로 인해 민주화 세력이 집권에 실패했을지라도, 1980년대 민주화 이행에서 정치사회와 김대중이 했던 중요한 역할은 평가절하될 수 없다. Based on the assumption that the role played by political society in the democratization process of South Korea in the 1980s has been underestimated, this article examines the role of Kim Dae-jung, one of the key players in this society. Throughout the 1980s, Kim Dae-jung was engaged in various kinds of domestic and overseas activities related to the democratization movement in South Korea, despite severe oppression of him by the authoritarian regime. Through interviews and public lectures during his exile in the United States, which began in December 1982, Kim Dae-jung criticized the Reagan Administration`s backing of South Korea`s military regime and appealed to the U.S. public for support of the democratization movement in South Korea. His activities enabled the U.S. media and members of Congress in favor of South Korean democratization to put pressure on the Reagan Administration. The evidence shows that this pressure influenced the U.S. administration`s policy toward South Korea and the policy of the Chun Doo-hwan regime toward the domestic democratization movement, both directly and indirectly. After returning to Korea in February 1985, Kim Dae-jung, together with opposition party leader Kim Young-sam, led a nationwide fight for a constitutional amendment that would proclaim a direct presidential election system. Furthermore, Kim Dae-jung realized that the success of the democratization movement in South Korea depended on a coalition of all the forces participating in the movement, as well as support by the middle class in Korea and sympathetic allies in the U.S. As a result, while working to form such a coalition, he also criticized radical student and social movements and argued for the three principles of nonviolence, non-pro-Communism, and non-anti-Americanism. In 1987, most of the forces participating in the democratization movement formed a coalition, the National Movement for the Democratic Constitutional Amendment. This coalition attracted broad participation by the middle class, under the banner of a constitutional amendment for a direct presidential election system, and led to the historic victory of the June Democratization Struggle in that year. Although the democratic forces failed to take power immediately, the success of opposition parties in the general election in 1988 contributed greatly to further progress in democratization in Korea, reinforcing this article`s thesis: that the political society and, in particular, Kim Dae-jung played a crucial role in the democratization of South Korea in the 1980s.

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