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채널 구조에 따른 1T-DRAM Cell의 메모리 특성
장기현,정승민,박진권,조원주,Jang, Ki-Hyun,Jung, Seung-Min,Park, Jin-Kwon,Cho, Won-Ju 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2
We fabricated fully depleted (FD) SOI-based 1T-DRAM cells with planar channel or recessed channel and the electrical characteristics were investigated. In particular, the dependence of memory operating mode on the channel structure of 1T-DRAM cells was evaluated. As a result, the gate induced drain leakage current (GIDL) mode showed a better memory property for planar type 1T-DRAM. On the other hand, the impact ionization (II) mode is more effective for recessed type.
나일론 및 폴리프로필렌섬유 복합혼입에 따른 고강도 콘크리트의 폭렬특성
장기현(Jang Ki-Hyun),배장춘(Pei Chang-Chun),김호림(Jin Hu-Lin),지석훈(Jee Suk-Won),양성환(Yang Seong-Hwan),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
This study investigates spalling properties of high strength concrete, 60MPa class, mixed the nylon and polypropylene fiber. As properties of the fresh concrete, the object is satisfied on all conditions because the slump flow is 700±100mm, and the air content is 3.0±0.5%. Totally, compressive strength is similar on 60-80MPa without relation of various mixture and mixing ratio on properties of the harden concrete. On spalling properties after fire test, the spalling phenomenon appear in the case mixed 6mm nylon with 12mm polypropylene and 6mm nylon with 19mm polypropylene, and the spalling phenomenon is prevented in the case that the mixture of 9mm nylon with 12mm polypropylene and mixed 9mm nylon with 19mm polypropylene mixed 0.04%. The residual compressive strength of NIPl is about 59%, that it is the best, on 0.05% of the fiber mixing ratio after fire test.
나일론 및 폴리프로필렌섬유 복합혼입에 따른 고강도 콘크리트의 폭렬특성
장기현 ( Jang Ki-hyun ),배장춘 ( Pei Chang-chun ),김호림 ( Jin Hu-lin ),지석원 ( Jee Suk-won ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
This study investigates spalling properties of high strength concrete, 60MPa class, mixed the nylon and polypropylene fiber. As properties of the fresh concrete, the object is satisfied on all conditions because the slump flow is 700±100mm and the air content is 3.0±05%. Totally, compressive strength is similar on 60~80MPa without relation of various mixture and mixing ratio on properties of the harden concrete. On spalling properties after fire test, the spalling phenomenon appear in the case mixed 6mm nylon with 12mm polypropylene and 6mm nylon with 19mm polypropylene, and the spalling phenomenon is prevented in the case that the mixture of 9mm nylon with 12mm polypropylene and mixed 9mm nylon with 19mm polypropylene mixed 0.04%. The residual compressive strength of NIPI is about 59%, that it is the best, on 0.05% of the fiber mixing ratio after fire test.
고강도 콘크리트의 내화특성에 미치는 방화석고보드의 두께 및 접착 보강 방식의 영향
장기현(Jang Ki-Hyun),배장춘(Pei Chang-Chun),이보형(Lee Bo-Hyeong),김호림(Jin Hu-Rin),양성환(Yang Seong-Hwan),한천구(Han Cheon-Goo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
This study investigated the fire-resistant characteristic of high strength concrete according to the change of the thickness and the adhesive method of fireproof plaster board and the results are summarized as followings. From the characteristic of fresh concrete, both slump flow and air content were appeared to satisfy each target range and the compressive strength appeared the range of high strength as 89.9 MPa from the characteristic of hardened concrete. From the characteristic of spalling, at all specimens of which the upper side finishing was not performed, the severe spalling that all covered concretes on 4 sides were felled off and internal reinforcing bars were exposed was occurred and spalling was appeared to occur even to the internal concrete. But, in case of specimen of which the upper side finishing was performed, spalling was not occurred. As the highest temperature of reinforcing part of each test after fire-resistant test, 19F1-MN-N showed l036℃ and 19F1-MN-T showed 272℃. 19F1-ML-T that had grouted lightweight mortar appeared the most excellent capability as 116℃. As for mass loss rate after fire-resistant test, 19F1-MN-N appeared the most mass loss rate as 27% but specimen of which the upper side was finished appeared the low mass loss rate as around 7%.
골재 및 결합재 종류 변화에 따른 고강도 콘크리트 모의부재의 폭렬특성
장기현 ( Jang Ki-hyun ),김호림 ( Jin Hu-rin ),김상식 ( Kim Sang-shik ),양성환 ( Yang Seong-hwan ),김성수 ( Kim Seoung-soo ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
This study investigates the spalling properties of the mock-up specimens composed of the high strength concrete corresponding to the aggregate and admixture types in the case that 0.05vol% of the hybrid organic fibers composed of the NY+PP fibers. The fluidity corresponding to the aggregate and admixture types of the OBS is most favorable, and all factors are also satisfied with the target value of the slump flow and air content. The compressive strength of the all specimens is about 80MPa at 28 days, For the spalling occurrence after the fire test, it is most appropriate in the case that the aggregate is the lime stone, or admixture is OBS. The residual compressive strength is by order of the granite, basalt, and lime stone in accordance with the aggregate types, and OPC, OFS, and OBS corresponding to the admixture types.
고온 가열시 혼화재 종류 변화에 따른 고강도 콘크리트의 강도특성
박병관 ( Park Byung-kwan ),장기현 ( Jang Ki-hyun ),이성연 ( Lee Seong-yeun ),김상식 ( Kim Sang-shik ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
This study investigates the strength properties of the high strength concrete subjected to the elevated temperature corresponding to admixture types. The results are summarized as following. The fluidity and air content corresponding to admixture types are satisfied with the target value of the slump flow. For the properties of the hardened concrete, the compressive strength of the all specimens is about 80MPa at 28 days, and they shows similar tendency. The compressive strength corresponding to the elevated temperature is increased at 200℃, but slightly decreased at 400℃. In the case that the elevated temperature is 600~800, it is suddenly declined.
고온 가열시 골재 종류 변화에 따른 고강도 콘크리트의 강도 특성
김상식(Kim Sang-Shik),장기현(Jang Ki-Hyun),이보형(Lee Bo-Hyeong),한창평(Hann Chang-Pyung),한민철(Han Min-Cheol),김성수(Kim Seoung-Soo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Results of this experiment tests showed that all specimens, as for the properties of fresh concrete, had favorable fluidity, satisfying 600±100㎜ of slump flow. Air content was varied with aggregate types which indicated 3.0±0.5% in the specimens using granite and lime stone as a coarse aggregate, but basalt used specimens increased the value more than 80%, compared with others. This is due to the multi porous properties of the basalt. The compressive strength of all specimens was indicated at around 80㎫ at 28 elapse days, but this strength values of the specimens gradually decreased at fire circumstance. It is demonstrated that the residual compressive strength of high strength structure, which was once exposed to the fire and cooled down, is deteriorated. This is highly affected by higher temperature, so that the careful attention should be considered whether the structures could be recycled again.
고온가열상황 변화에 따른 고성능 콘크리트의 역학적 특성
이주선 ( Lee Ju Sun ),장기현 ( Jang Ki Hyun ),이보형 ( Lee Bo Hyeong ),한창평 ( Han Chang Peng ),양성환 ( Yang Seong Hwan ),한천구 ( Han Cheon Goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the Mechanical Properties of high Performance concrete by heating temperature, Elevated Temperature Duration and heating speed change through mix-in, and has shown the following results. Hardened concrete characteristics, age 28 days compression strength, 79.6 MPa, showed a high strength range close to 80 MPa level and age 28 days tension strength was 4.4 MPa. Also, The residual compression strengths by varied heating speed and heating temperature were 6.7℃/min 12hr., 13.4℃/min 2hr. and 6.7℃/min 2hr. at 20℃, and dramatically dropped at over 300℃. In summary, in case of concrete structure fire, structure safety drops dramatically and heat resistance deteriorates as heating delays, and therefore proper safety diagnosis evaluation and human protection and structure damage reduction measures will be necessary.
NY과PP 섬유의 길이조합 및 혼입률 변화에 따른 고성능 콘크리트의 폭렬방지 특성
한천구(Han Cheon-Goo),김성수(Kim Seong-Soo),김상식(Kim Sang-Shik),장기현(Jang Ki-Hyun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
This paper intend to investigate spalling prevention of high performance concrete incorporating hybrid organic fiber subjected to fire. According to previous research conducted by the authors, it was found that the use of nylon fiber (NY) and polypropylene fiber (PP) at the same time resulted in better performance in spalling prevention. The experimental parameters were combinations of length and contents. Ahead, on the fresh concrete, All of the changing fiber contents and ratios satisfied 650±100 ㎜ on slump flow and 3.0±1.0 % on air content, and there was no remarkable tendency on the compressive tensile and strength. The spalling properties after fire resistance examination according to standard heating curve at KS F 2257-1 for 1 hour, the aspect ratio of fiber was related to spalling prevention, and 0.03 vol.% of NY+PP fiber which had 613 as aspect ratio was the best condition for spalling prevention. In conclusion, the method of mixture with NY and PP fibers could effectively prevent the spalling with a small amount compared with the other fibers. Moreover, it was favorable for the workability and economy.
방화석고보드 두께 및 접착방식 변화에 따른 고강도 콘크리트의 폭렬특성
한천구,배장춘,장기현 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.26 No.1
This study investigates fire resistance properties of high strength concrete designed with various thickness and adhesive methods of fireproof gypsum board. Test results showed that compressive strength of control concrete indicated 89.9MPa, which is high strength rage. For the fire test results, uncovering top section of specimens caused severe spalling occurrence in all sides, exposing mostly re-bars. Moreover, some specimens even exposed main bars of concrete. However, covering top section of specimens protected from fire and resulted in secured high strength concrete. The maximum temperature of main bars in 19BN-W indicated 1017℃, in 19MB-W was 1061℃, in 19MN-W was 1036℃, in 25MB-W was 583℃ and in 19MN-T was 271℃ respectively. 19MB-W had the highest value of weight loss ratio, indicating 54%, while 25MB-W showed 43% of weight loss ratio, 19BN-W was around 40%, 19MN-W was around 27% and 19MN-T was around 7%.