http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Korean English Teacher's Disempowerment in English-only Classes
Sung-Sam Hwang,Hyo-Sun Seo,Tae-Young Kim 한국사회언어학회 2010 사회언어학 Vol.18 No.1
Hwang, Sung-Sam, SeD, Hyo-Sun, Kim, Tae-Young. 2010. Korean English Teacher's Disempowerment in English-only Classes: A Case Study Focusing on Korea-specific Cultural Aspects. The Sociolinguistic journal of Korea 18(1). In this case study, we have focused on the disempowerment of a Korean English teacher (KET) in English-only classrooms. Six English as a foreign language (EFL) classrooms in a Korean high school were observed and analyzed by using interpretive discourse analysis. Out of the six classes, three representative classrooms were both video- and audio-taped. The results show that the English-only classes could weaken the KETs' power via three mechanisms: (a) calling the KETs' last name for choral greetings at the beginning of the class, (b) students' group solidarity and peer pressure between classmates, and (c) the students' excessively collaborative approach to peer assistance. It is argued that the exclusive English-only instruction disempowers the KETs' status and dismantles their vocational identity. In order to remedy the current situation, within a scaffolding supported by the eclectic use of first language where necessary for effective class management, KETs are empowered and overcome constraints imposed by the limited L2 oral competence of some non-native English teachers.
( Hyo Jung Cho ),( Soon Sun Kim ),( Sung Won Cho ),( Hwang Sun Hyuk ),( Jong Ik Park ),( Jae Youn Cheong ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Barcelona Clinic Liver Cancer (BCLC) C stage is defined as patients with preserved hepatic function and one of those adverse predictors including performance status (PS) 1-2, vascular invasion (VI), or extrahepatic spread (EHS). Therefore, BCLC C demonstrates extreme heterogeneity because patients with PS 1-2 are categorized to BCLC C regardless of tumor burden, VI or EHS. This study aimed to modify BCLC system based on PS to derive more relevant staging system. Methods: A total of 7,501 subjects, who were registered in Korean Liver Cancer Study Group during the period 2008-2013, were analyzed. Kaplan-Meier analysis was used to compare overall survival (OS). The relative goodness-of-fit between staging system was compared by Akaike information criterion (AIC) and integrated area under the curve (IAUC). Results: Two modified BCLC (mBCLC) systems (#1 and #2) were derived by reducing role of PS in BCLC system. The patients with PS 1 or 2 without VI or EHS were reassigned to stage 0, A, or B according to their tumor burden (Figure 1). Prognostic accuracy was compared between mBCLC systems and original BCLC by AIC and IAUC. As a result, mBCLC#2 system identified as most explanatory and desirable model for HCC staging by showing smallest AIC value (AIC=70088.01) and largest IAUC (IAUC=0.722), while original BCLC showed the biggest AIC value (AIC=70697.17) and smallest IAUC (IAUC=0.705). The mBCLC#2 stage C was further sub-classified into C1, C2, C3 and C4 according to the variables which selected by statistical and clinical importance (Figure 1C). The C1-C4 sub-groups showed significant different OS distribution between groups (P < 0.001). Conclusions: Modification of BCLC system based on PS derived accurate and relevant modified BCLC system for HCC patients.
Experimental Study on Performance of Wave Energy Converter System with Counterweight
Sung-Hoon Han,Hyo-Jae Jo,Seung-Jae Lee,Jae-Hyuck Hwang,Ji-Won Park 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.1
In order to convert wave energy into large quantities of high-efficiency power, it is necessary to study the optimal converter system appropriate for the environment of a specific open ocean area. A wave energy converter system with a counterweight converts the translation energy induced from the heave motion of a buoy into rotary energy. This experimental study evaluated the primary energy conversion efficiency of the system, which was installed on an ocean generating basin with a power take-off system. Moreover, this study analyzed the energy conversion performance according to the weight condition of the buoy, counter-weight, and flywheel by changing the load torque and wave period. Therefore, these results could be useful as basic data such as for the optimal design of a wave energy converter with a counterweight and improved energy conversion efficiency.
Prevention of coalescence during annealing of FePt nanoparticles assembled by convective coating.
Hwang, Yeon,Park, Jong-Sung,Choi, Young Jin,Suh, Yong Jae,Lee, Hyo-Sook,Kang, Dae Sik,Lee, Jong Kook American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5
<P>FePt nanoparticle suspension was synthesized by reduction of platinum acetylacetonate and decomposition of iron pentacarbonyl in the presence of oleic acid and oleyl amine. The composition of the synthesized nanoparticles was Fe40Pt60. To prevent the coalescence during annealing of FePt nanoparticles we tried two steps of convective coating, where first coating was for silica particle assembly on a silicon substrate and second one was for FePt nanoparticles on the silica layers. It was observed by scanning electron microscopy that FePt nanoparticles were dispersed on the silica surface. After being annealed at 700 degrees C for 30 minutes under nitrogen atmosphere, the particle size of FePt nanoparticles increased slightly from 4 nm to 6 nm but dispersity of the nanoparticles was maintained. Magnetic hysteresis of Fe40Pt60 nanoparticles coating on silica layer after annealing showed typical characteristics of hard magnetic materials, and no incorporation of soft magnetic materials. It was suggested that convective self-assembly with the parallel use of pre-coating that offers solvent flux weakening capillary force between FePt nanoparticles was an effective method to prevent coalescence of nano-sized particles under high temperature annealing.</P>