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Waseem, Owais Ahmed,Auyeskhan, Ulanbek,Lee, Hyuck Mo,Ryu, Ho Jin Published for the Materials Research Society by th 2018 Journal of materials research Vol.33 No.19
<▼1><B>Abstract</B><P/></▼1><▼2><P>To overcome the limited feasibility of various refractory high-entropy alloys (HEAs) due to the presence of (i) very dense elements (W and Ta), (ii) costly elements (Hf and Ta), and (iii) oxidation prone elements (V) in them, Al<I>x</I>Cr<I>y</I>Mo<I>z</I>NbTiZr HEAs were prepared via arc-melting. Considering the critical nature of oxidation resistance in high-temperature applications, HEAs were characterized to form a combinatorial library of microstructural and oxidation behavior. Al<I>x</I>Cr<I>y</I>Mo<I>z</I>NbTiZr HEAs revealed multiphase microstructures consisting of intermetallic phases along with BCC matrices. Mass loss and porous microstructures were obtained in Mo-rich HEAs after oxidation at 1000 °C for 1 h. The presence of Al enhanced the oxidation resistance and developed a protective oxide layer on the HEAs. Al30Cr10-NTZ exhibited promising potential for use in high temperature applications, as it showed an oxidation time exponent of ∼0.5 and a dense and continuous oxide layer.</P></▼2>
흰쥐에서 음경발기 평가의 척도로서 음경해면체내압측정술 확립
송윤섭,김용준,이광우,김준모,문기혁,박영호,민영기,유형균,김형건 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1
Purpose: Because studies about the control of penile erection at the entral nervous system was dependent on the animal experiments, establishment of measuring penile erection is important to evaluate the effects changes at the central nervous system on the penile erection. Intracavernous pressure measurement in rats has been introduced as a suitable index for the evaluation of penile erection but this method is invasive and technically difficult. So, we established the intracavernous pressure measurement in rats as the experimental index for penile erection. Materials and Methods: 42 male adult Sprague-Dawley rats (250-300gm) were divided to saline or papaverine treated group. Rats were placed on a heating table to maintain their body temparature and anesthetized with 50mg/kg of pentobarbital sodium by intraperitoneal injection. A cannula was inserted to the left carotid artery to measure systemic blood pressure. Saline (0.05, 0.1ml), papaverine(0.05, 0.1, 0.25, 0.5, 1.0, 2.0mg) were injected intracavernously via 26 guage needle filled with saline or papaverine which connected to pressure transducer and polygraph was inserted into the corpus cavernosum on one side to inject the drug and to measure intracavernous presure. Results: Properly executed insertion and intracavernous administration produced a instantaneous but transient rise in intracavernous pressure that substantially stabilized and maintained at 5.4±0.4mmHg. Intracavernous pressure and duration of penile blood flow following intracavernous injection of papaverine are increased comared to those of saline. Conclusions: Monitoring intracavernous pressure in rats represents a suitable index for the evaluation of penile erection in small laboratory animals.
Predicting the Unemployment Rate Using Social Media Analysis
Ryu, Pum-Mo Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.4
We demonstrate how social media content can be used to predict the unemployment rate, a real-world indicator. We present a novel method for predicting the unemployment rate using social media analysis based on natural language processing and statistical modeling. The system collects social media contents including news articles, blogs, and tweets written in Korean, and then extracts data for modeling using part-of-speech tagging and sentiment analysis techniques. The autoregressive integrated moving average with exogenous variables (ARIMAX) and autoregressive with exogenous variables (ARX) models for unemployment rate prediction are fit using the analyzed data. The proposed method quantifies the social moods expressed in social media contents, whereas the existing methods simply present social tendencies. Our model derived a 27.9% improvement in error reduction compared to a Google Index-based model in the mean absolute percentage error metric.
A Study of mechanical properties of oxide layer removed Co-Cr-Mo abutments
Ryu, Jae-ho,Huh, Jung-Bo,Ro, Jung-Hoon,Yun, Mi-Jung,Jeong, Chang-Mo The Korean Dental Association 2015 대한치과의사협회지 Vol.53 No.11
PURPOSE: The aim of this study was to evaluate the influence of the oxide layer removal process in the Co-Cr-Mo (CCM) abutment after casting procedure on the prosthesis settlement and screw stability. MATERIALS AND METHODS: CCM abutments of four different interface conditions (CCM-M; machined, CCM-O; oxide layer formed, CCM-B; blasted, CCM-P; polished after blasted) and gold abutment (Gold-C; Cast with type III Gold alloy) were used. The initial settling values of abutments were evaluated according to the difference of implant-abutment length when the tightening torques were applied at 5 Ncm and 30 Ncm, and the settling values of abutments caused by loading were evaluated according to the difference of implant-abutment length before and after loading with 250 N, 100000 cycle. The loss ratios of removal torque for abutment screws were evaluated according to the difference in value of removal torques under 30 Ncm tightening torque applied before and after cyclic loading. RESULTS: The CCM-P and CCM-B group showed a higher initial settling value compared with the Gold-C group (P<.05), while the Gold-C group showed the highest settling values caused by loading (P<.05) and no significant differences were observed for between CCM groups (P>.05). The loss ratio of removal torque values for the CCM-B, CCM-P groups did not differ significantly from that of the Gold-C group (P>.05). CONCLUSION: Even though the oxide layer was removed by different methods, CCM abutment with internal conical connection structure showed lower abutment settling and similar screw loosening after cyclic loading compared with gold abutment.
스마트교육 기반 디지털교과서 활용 실천 교사 역량모델 개발
류광모(Ryu Kwang mo),손성호(Son Sung ho) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.8
본 연구는 스마트교육을 기반으로 한 디지털교과서 실천 교사의 역량을 개발하고자 수행되었다. 역량개발은 역량모델링을 활용하여 개발하였으며, 문헌조사, 우수수행자와의 행동사건면접(BEI)와 초점집단면접(FGI) 등을 통해 1차 역량모델을 도출하였고, 전문가 델파이 조사를 거쳐 최종 역량을 개발하였다. 그리고 요구도 분석을 통해 개발된 역량들의 우선순위를 분석하였다. 연구결과 DT기반역량군, DT활용역량군, DT수업실행역량군의 3의 역량군과 디바이스 관리 및 활용 능력, 도전정신, 창의적 교육과정 구성 역량, 디지털교과서 교수-학습 설계, 커뮤니테이션 역량, 디지털교과서 교수-학습 평가 능력, 변화와 민감성의 8개 역량명과 행동지표가 개발되었다. 또한 요구도 분석을 통해 역량들의 우선순위를 도출하였다. 이러한 결과는 향후 디지털교과서 정책수립과 교사 연수 프로그램 설계 등에 대해 많은 시사점을 제공할 것이다. This study aims to develop the teachers’ competency model for digital textbook learning based on smart education. An interview with a teacher considered as a good model for adapting smart education had drawn the first competency model and the final competency model was developed using Expert Delphi method. The order of priority of developed competency through Needs Analysis was analyzed. The result shows three competency groups (digital foundation competency, digital utilization competency and digital class competency) and eight competency evaluation indexes (management skill and utilization ability of the device, challenge spirit, creativity of designing curriculum, teaching learning model development with digital textbook, communication skill, teaching learning model development evaluation skill, changes and sensibility). This will bring various learning points for future policy direction of digital textbook and teachers’ training design.
유상모(Ryu, Sang-Mo),정의봉(Jeong, Weui-Bong),한형석(Han, Hyung-Suk) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.8
This paper deals with the process to identify the transient exciting force generated from a rotary compressor. The compressor was assumed to be a rigid body. The equation of motion of a rigid compressor supported by three mounts was derived with 6 degree-of-freedom. The exciting forces at the center of mass of the compressor were estimated from the acceleration data measured at compressor shell. Compressor-pipe system was modeled numerically. The accelerations of compressor and pipe were predicted numerically by using the estimated exciting force. A new shape of pipe model was proposed to reduce the vibration. In the prediction by the method in this paper, the maximum acceleration of the pipe could be reduced by 53.7 % at the steady-state and by 12 % at the transient process. In the real experiments, the maximum acceleration of the pipe was reduced by 54.2 % at steady-state and 14.7 % at the transient process. It was verified that the numerical results showed good agreement with experimental results.