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RISS 인기검색어
- 검색키워드
- 저자 : 김홍주 (검색결과 106 건)
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폐어망과 토목섬유를 이용한 보강 경량토의 역학적 특성 연구
A lightweight soil is a cement-treated soil that consists of dredged clayey soil, cementing material and air-foam. Lightweight soil is characterized as a material with light unit weight as well as high shear strength. Reinforced lightweight soil is a lightweight soil reinforced with waste fishing net or geogrid in order to increase its compressive strength. This paper investigates engineering properties, strength characteristics, stress-strain behaviors, consolidation characteristics and shear wave velocities of both unreinforced and reinforced lightweight soils. Test specimens were fabricated by various mixing conditions including cement content, initial water content, air content and content of fiber (waste fishing net, geogrid) and then several series of unconfined compression test, direct shear test, standard one-dimensional consolidation test and elastic wave test were performed. The experimental results of lightweight soils indicated that unconfined compressive strength increased with increase in cement content, but decreased with increases in water content and air-foam content. It was also shown that compressive strength of reinforced lightweight soil generally increased by adding waste fishing net or geogrid, but amount of increase in compressive strength was not proportional to content of waste fishing net. This result was also shown in that of direct shear test. In reinforced lightweight soil, secant modulus (E50) was increased as the strength increased due to the inclusion of fiber. However, consolidation characteristics of lightweight soil such as yielding stress, compression index, coefficient of consolidation and coefficient of permeability were almost same, irrespective of adding waste fishing net or geogrid. Elastic soil moduli of unreinforced and reinforced lightweight soils were also evaluated from shear wave velocity.
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인터넷 기반 대화식 저널쓰기가 초등학생의 영어쓰기 능력에 미치는 영향
김홍주 韓國外國語大學校 敎育大學院 2011 국내석사
Dialogue journal writing is one of the effective methods to let EFL learners to write in real world situations. So far, there were many studies that proved the effectiveness of dialogue journal writing. However, not many of them have proved the effects of e-based dialogue journal writing using internet cafe. This study was conducted to observe the effects of e-based dialogue journal writing on elementary school students' writing and the changes of affective aspects after writing e-based dialogue journal. Three sixth graders of elementary school in Seoul participated in this study for 15 weeks. Before starting dialogue journal, as a pilot study, they had a chance to read some stories and write dialogue journals with the researcher to understand the concept of dialogue journal writing. The researcher found the students' affective aspects on reading and writing by using some questionnaires and a pre-interview. This study used some e-books online as reading material. There were eight topics and each journals of a topic required two weeks. Students participated two times a week. After reading e-books, students summarized the story and wrote their own journal on the first week. On the second week, students wrote a e-dialogue journal with the researcher and wrote the final version of their own dialogue journals. After writing 8 final journals, students answered to post-questionnaires and did a post-interview. After the observation, all students have improved their amount of writing and sentence structures. Also, most students wrote their journals using more various words compare to the previous ones. Students' contents of the journal also improved because they tried to write about their own thought, feelings, and experience. Students' response on the researcher's feed became active and diversified comparing to their response first dialogue journal. At the first time, they only tried to reply using short sentences and words. However, they started to ask questions, give their own opinions, and tell personal experience to the researcher. There was no significant difference in ability on self error correction among most students. The student who was focusing on correct forms recognized researcher's correct form and corrected by herself. In affective aspects, students' interest in reading and interest and confidence in writing increased, but there was no significant difference in confidence in reading after writing e-based dialogue journal. four out of five students preferred to write on-line than write on a notebook because it was easy to add, erase and correct the journal which they have written. Also, many students accessed to the e-book website whenever they want to read again to write the journal, and it lowered students' affective filter. Students trust and like the researcher more after the experiment, and it helped the researcher to manage the class easily because students tell secrets to deal with their problems. The preference of topics in e-based dialogue journal was differed from gender. Male students didn't have favorable topics, but female students were interested in friendship, music, travel and celebrities. This study suggests that teacher's effort can provide more chance to write out of class to students, and it is effective on increasing elementary school students' writing ability.
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복합재-알루미늄 단일겹침 하이브리드 체결부 강도특성 실험연구
김홍주 경상대학교 산업대학원 2007 국내석사
The strength of aluminum 2024 and carbon composite hybrid joints was studied for rivet, and the adhesive-rivet combined joints. A total of 105 composite-to-aluminum single lap joint specimens were tested to investigate the failure loads and modes for two types of the joints, three overlap length and two(hybrid)/five(rivet) stacking sequences. Film type adhesive FM73 was used for aluminum and composite bonding. All the simple rivetted joints failed in the bearing of composite laminates, and the stacking sequence and overlap length showed little effects on the failure loads. Major failure mode of the hybrid joints of rivet and bonding was the delamination of the composite laminates and therefore the failure loads were affected by the stacking sequence and overlap lengths. The failure loads of the hybrid joints were dominated by the bonding and the rivet joints showed little contribution to the failure loads of the hybrid joints.
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다양한 표면 처리 방법이 지르코니아-도재의 전단결합강도에 미치는 영향
김홍주 전남대학교 치의학전문대학원 2010 국내석사
This study examined the effects of various surface treatments on the shear bond strength between zirconia and ceramic. Forty specimens (5 mm x 10 mm x 10 mm) were divided equally into 5 groups according to the surface treatment : Control (C); Sandblasting with 110 ㎛ Al2O3 (S110); Sandblasting with 250 ㎛ Al2O3 (S250); Liner (L); Sandblasting with 110 ㎛ Al2O3 and Liner (SL). The veneering ceramics (cylindrical shape - diameter 2.4 mm, height 3 mm) were built and fired onto the zirconia core materials. The shear bond strength was tested using a universal testing machine, and the data was analyzed statistically. The zirconia-ceramic bonded and fractured surfaces were observed by field emission scanning electron microscopy (FE-SEM). The FE-SEM images of the zirconia-ceramic sectioned area showed roughened surfaces on the sandblasted specimens. All specimens showed a continuation of the crystal structures between the core and veneer. Sandblasting with 110 ㎛ and 250 ㎛ alumina particles enhanced the shear bond strength. On the other hand, liner application and sandblasting with liner application reduced the shear bond strength. The difference between sandblasting group and liner group was significant (P < 0.05). In all specimens, the fracture began at the zirconia-ceramic interface and proceeded into the veneering ceramic. All groups showed combined fracture mode. However, the liner-applied group showed mainly adhesive failure. In the liner application groups, complete delamination and microspaces were observed. FE-SEM observations of the zirconia-ceramic interface showed the fusion of the crystallized phases. A significant difference in shear bond strength was observed between the sandblasted group and liner-applied group. Sandblasting decreased the percentage of interfacial failure patterns and increased the surface roughness and bond strength. In contrary, liner application reduced the shear bond strength and increased the likelihood of interfacial failure and delamination of the veneering ceramic from the zirconia core structures.
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