이갈이 진단 및 조절용 구내장치의 개발과 신뢰도 조사

김성원,김미은,김기석,Kim, Seung-Won,Kim, Mee-Eun,Kim, Ki-Suk 대한안면통증구강내과학회 2005 Journal of Oral Medicine and Pain Vol.30 No.1

The purposes of this study were to develop and introduce a novel intraoral appliance for bruxism composed of power switch and biofeedback device and further to examine inter- and intra-reliability of the appliance prior to clinical tests. The newly-developed appliance consisted of detection sensors, a central processing unit (CPU), a reactor and a storage unit and a displayer. Compact-sized, waterproof switches were selected as bruxism detection sensor and any sensor activation by clenching or grinding event was processed at the CPU and transmitted, by radio wave, to the reactor and storage unit and triggered auditory or vibratory signal, subsequently producing biofeedback to the patient with bruxism. The data on bruxing event in the storage unit can be displayed on the computer, making it possible analyzing frequency, duration and nature of bruxism. Cast models were obtained from ten volunteers with normal occlusion to evaluate reliability of the appliances. For inter-operator reliability on the intraoral appliances, each operator of the two fabricated the appliance for the same subject and compared the minimal contact forces provoking auditory biofeedback reaction in vertical, lateral and central directions. Intra-operator reliability was also investigated on the appliances made by a single operator at two separate times with an interval of two days. Conclusively, the newly-developed appliance is compact and safe to use in oral circumstance and easy to make. Furthermore, it had to be proven reliability excellent enough to apply in clinical settings. Thus, it is assumed that this appliance with the processor and the storage of data and auditory or vibratory biofeedback function is available and useful to analyze and control bruxism.

실리콘 나노선/다중벽 탄소나노튜브 Core-Shell나노복합체의 합성

김성원,이현주,김준희,손창식,김동환,Kim, Sung-Won,Lee, Hyun-Ju,Kim, Jun-Hee,Son, Chang-Sik,Kim, Dong-Hwan 한국재료학회 2010 한국재료학회지 Vol.20 No.1

Si nanowire/multiwalled carbon nanotube nanocomposite arrays were synthesized. Vertically aligned Si nanowire arrays were fabricated by Ag nanodendrite-assisted wet chemical etching of n-type wafers using $HF/AgNO_3$ solution. The composite structure was synthesized by formation of a sheath of carbon multilayers on a Si nanowire template surface through a thermal CVD process under various conditions. The results of Raman spectroscopy, scanning electron microscopy, and high resolution transmission electron microcopy demonstrate that the obtained nanocomposite has a Si nanowire core/carbon nanotube shell structure. The remarkable feature of the proposed method is that the vertically aligned Si nanowire was encapsulated with a multiwalled carbon nanotube without metal catalysts, which is important for nanodevice fabrication. It can be expected that the introduction of Si nanowires into multiwalled carbon nanotubes may significantly alter their electronic and mechanical properties, and may even result in some unexpected material properties. The proposed method possesses great potential for fabricating other semiconductor/CNT nanocomposites.

나노인덴테이션을 이용한 Ti(C_0.7N_0.3)-NbC-Ni 써멧 구성상의 경도평가

김성원,김대민,강신후,류성수,김형태,Kim, Seong-Won,Kim, Dae-Min,Kang, Shin-Hoo,Ryu, Sung-Soo,Kim, Hyung-Tae 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6

The indentation technique has been one of the most commonly used techniques for the measurement of the mechanical properties of materials due to its experimental ease and speed. Recently, the scope of indentation has been enlarged down to the nanometer range through the development of instrumentations capable of continuously measuring load and displacement. In addition to testing hardness, the elastic modulus of submicron area could be measured from an indentation load-displacement (P-h) curve. In this study, the hardness values of the constituent phases in Ti($C_{0.7}N_{0.3}$)-NbC-Ni cermets were evaluated by nanoindentation. SEM observation of the indented surface was indispensable in order to separate the hardness of each constituent phase since the Ti($C_{0.7}N_{0.3}$)-based cermets have relatively inhomogeneous microstructure. The measured values of hardness using nanoindentation were ${\sim}20$ GPa for hard phase and ${\sim}10$ GPa for binder phase. The effect of NbC addition on hardness was not obvious in this work.

수업 지도안 분석을 통한 예비 교사의 수업 전문성 변화

김성원(Seong-Won Kim),이소율(Soyul Yi),이영준(Youngjun Lee) 한국컴퓨터정보학회 2020 韓國컴퓨터情報學會論文誌 Vol.25 No.1

본 연구에서는 TPACK 교육을 통해 예비 교사의 수업 전문성 변화를 분석하였다. 이러한 연구를 위하여 예비 교사 20명을 대상으로 김성원과 이영준(2019)에서 개발한 프로그래밍 기반 TPACK 교육 프로그램을 적용하였다. 수업 전문성 분석을 위하여 예비 교사가 작성한 수업 지도안을 분석 틀을 활용하여 분석하였다. 연구 결과, 1차 수업 지도안에서 예비 교사는 테크놀로지 활용이 저조하며, 지식을 전달하거나 실험하는 수업을 설계하였다. 2차 수업 지도안에서는 테크놀로지 활용이 증가하였지만, 교육적 맥락에 따라 테크놀로지가 활용되지 않았다. 3차 수업 지도안에서 모든 예비 교사가 테크놀로지를 교육적 맥락에 따라 활용하는 것을 확인할 수 있었다. 또한, 예비 교사의 수업 전문성은 통계적으로 유의한 향상이 나타났다. This study analyzed the change of teaching expertise of pre-service teachers through TPACK education. In this study, we applied a programming-based TPACK education program developed by Kim and Lee (2019) to 20 prospective teachers. To analyze the pre-service teachers’ teaching expertise analyzed the lesson plan prepared before, during and after applying the educational program. As a result, Few teachers use technology in lesson plan, and the design of the instructor-led or experiment to confirmed content in curriculum or textbook. The use of technology has increased in the second Teaching Plan, but the technology was not used depending on the educational context. In the third lesson plan, all pre-service teachers were able to use technology in an educational context. Moreover, the teaching expertise of the pre-service teacher showed a statistically significant improvement in the lesson plan. This study founded that the programming-based TPACK education program was effective in enhancing the teaching expertise of the pre-service teacher.

나노인덴테이션으로 측정한 Ti(C_0.7N_0.3)-WC-Ni 써멧 구성상의 경도

김성원,김대민,강신후,김형준,김형태,Kim, Seong-Won,Kim, Dae-Min,Kang, Shin-Hoo,Kim, Hyeong-Jun,Kim, Hyung-Tae 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1

The constituent phases in Ti($C_{0.7}N_{0.3}$)-xWC-20Ni (wt%, x=5, 15, 25) cermets were characterized using nanoindentation in conjunction with observation of microstructure. The microstructure of cermet is composed of hard phase and binder phase, which gave rise to a wide range of hardness distribution when nanoindentation was carried out on the polished surface of cermets. Because of the inhomogeneous nature of cermet microstructure, observation of indented surface was indispensable in order to separate the hardness of each constituent phase. The measured values of hardness using nanoindentation were ${\sim}14\;GPa$ for the binder phase and ${\sim}24$ to 28 GPa for the hard phase, of which nanoindentation hardness was decreased with the addition of WC into Ti($C_{0.7}N_{0.3}$)-Ni system. In addition, the nanoindentation hardness of Ni binder phase was much higher than reported Vickers hardness, which could result from confined deformation of binder phase due to the surrounding hard phase particles.

신형식 FRP DSCT 풍력타워의 단면설계와 해석

김성원,홍혜민,한택희,Kim, Sungwon,Hong, Hyemin,Han, Taek Hee 한국구조물진단유지관리공학회 2016 한국구조물진단유지관리공학회지 Vol.20 No.3

과학 · 수학 · 정보 융합 교육을 통한 중학생의 컴퓨팅 사고력 변화

김성원(Seong-Won Kim),이영준(Youngjun Lee) 한국컴퓨터교육학회 2021 한국컴퓨터교육학회 학술발표대회논문집 Vol.25 No.1(A)

시대의 변화에 따라 창의융합형 인재에 대한 요구가 증가하였다. 이에 따라 한국에서는 STEAM 교육을 학교 현장에 도입하였지만, 융합 교육의 정체성과 교사의 전문성 부족으로 인하여 융합 교육의 도입에 어려움을 겪었다. 따라서 2018년에 ‘과학·수학·정보 교육 진흥법’이 제정되었으며, 과학·수학·정보 융합 교육을 위한 교육 프로그램이 개발되었다. 하지만 과학·수학·정보 융합 교육의 효과를 분석하는 연구가 진행되지 않았다. 따라서 본 연구에서는 중학생을 대상으로 과학·수학·정보 융합 교육의 효과를 분석하는 연구를 진행하였다. 처치로 이영준 외(2018)에서 개발한 과학· 수학·정보 융합 교육 프로그램을 중학생에게 9차시 적용하였다. 과학·수학·정보 융합 교육의 효과를 분석하기 위하여 김성원과 이영준(2020)에서 개발한 중학생의 컴퓨팅 사고력 검사 도구를 사용하였다. 연구 결과, 중학생은 과학·수학·정보 융합 교육을 받은 후, 컴퓨팅 사고력이 향상되는 것으로 나타났다.

도입된 잉어과 어류 3종의 외부형태 및 염색체 특징

김성원,최낙중,이종윤,이완옥,장선일,Kim, Seong-Won,Choi, Nack-Joong,Lee, Jong-Yun,Lee, Wan-Ok,Jang, Seon-Il 한국어류학회 1996 韓國魚類學會誌 Vol.8 No.2

중국원산으로 한국에 도입된 초어(grass carp, Ctenopharyngodon idellua), 대두어(bighead carp, Aristichthys nobilis) 및 백련어(Silverer carp, Hypophthalmichthys molitrix)의 외부형태 및 염색체 특징에 대한 기본 정보를 얻기 위하여 본 연구를 하였다. 초어는 새파, 체측비늘, 지느러미들의 기조수와 계측치에서 대두어 및 백련어와 차이를 보였다. 대두어와 백련어는 복부에 용골과 외부 형태 등에서 유사했으나, 새파와 체측의 반문에서 쉽게 구분되었다. 그러나 염색체 수는 2n=48, arm number (fundamental number, NF)는 84로 모두 동일하였다. 연구된 3종의 염색체는 모두 metacentric chromosome이 10쌍, submetacentric chromosome이 8쌍, acrocentric 또는 telocentric chromosome이 6쌍으로 구성되어 있었다. 그리고 외부형태 형질, 국명 및 핵형의 유연관계에 대해서 논의하였다. This study was carried out to obtain the basic information on morphological and chromosomal charateristics in the three species of Chinese carps (grass carp; Ctenopharyngodon idellua, bighead carp; Aristichthys nobilis, and silver carp; Hypophthalmichthys molitrix) introduced to Korea from China. C. idellua was differ from A. nobilis and H. molitrix by the number of gill rakers, scales, fin rays, body proportion. A. nobilis and H. molitrix were similar in having ventral keel and many scale number, but H. molitrix was differ from A. nobilis by the connected gill rakers and body color pattern. Diploid chromosome and arm number (fundamental number, NF) of the three species were all the same to 2n=48 and NF=84. Diploid chromosome numbers in the three species are consisted of 10 pairs of metacentric chromosome, 8 pairs of submetacentric chromosome and 6 pairs of acro and/ or telocentric chromosome. Morphological and karyological relationship of the three Chinese carps are discussed.

출발 1999 전망과 회고-과학

김성원,Kim, Seong-Won 대한출판문화협회 1999 출판저널 Vol.249 No.-

지난해의 연장 속에서 환경문제와 함께 인간 복제문제, 상대성이론과 시간과 관련된 내용들, 노벨상과 관련된 대중서가 계속 소개될 것이다. 중요한 것은 외국서적을 단순히 번역할 뿐만 아니라 국내 저자가 저술한 책의 출간이 필요하다는 점이다.

담배와 건강 - 흡연이 건강에 미치는 영향

김성원,Kim, Seong-Won 한국과학기술단체총연합회 2002 과학과 기술 Vol.35 No.5

발암물질만 40종 암에 걸리는 것은 당연, 흡연자 비흡연자보다 11년 일찍 죽어