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Song, Yoon-Ho,Cho, Young-Rae,Hwang, Chi-Sun,Kim, Bong-Chul,Ahn, Seong-Deok,Chung, Choong-Heui,Kim, Do-Hyung,Uhm, Hyun-Seok,Lee, Jin-Ho,Cho, Kyoung-Ik The Korean Infomation Display Society 2001 Journal of information display Vol.2 No.3
Amorphous silicon thin-film transistors (a-Si TFTs) were incorporated into Mo-tip-based triode-type field emitters and diode-type ones of carbon nanotubes for an active-matrix cathode (AMC) plate of field emission displays. Also, we developed a novel surface-treatment process for the Mo-tip fabrication, which gleatly enhanced in the stability of field emission. The field emission currents of AMC plates on glass substrate were well controlled by the gate bias of a-Si TFTs. Active-matrix field emission displays (AMFEDs) with these AMC plates were demonstrated in a vacuum chamber, showing low-voltage matrix addressing, good stability and reliability of field emission, and highly uniform light emissions from the anode plate with phosphors. The optimum design of AMFEDs including a-Si TFTs and a new light shield/focusing grid is discussed.
Song, Hye Ji,Jang, Seol Heui,Ahn, Juhyeon,Oh, Si Hyoung,Yim, Taeeun Elsevier 2019 Journal of Power Sources Vol.416 No.-
<P><B>Abstract</B></P> <P>Nickel-rich nickel-cobalt-manganese layered oxides receive significant attention as advanced cathode materials, however, they suffer from poor cycling performance at elevated temperature because of surface instability. In this study, we develop nickel-rich cathode materials modified by an artificial cathode-electrolyte interphase layer embedding silyl ether functional groups. An artificial cathode-electrolyte interphase layer-functionalized nickel-rich cathode materials are simply synthesized via a wet-coating-based thermal treatment using a dimethoxydimethylsilane as an organic precursor. The task-specific silyl ether functional groups are effective in selectively scavenging nucleophilic fluoride species, which potentially triggers the dissolution of transition metal components into the electrolyte. Microscopic analyses indicate that the artificial cathode-electrolyte interphase layer is well developed on the surface of the nickel-rich cathode materials with several nanometers-thickness. The cells cycled with functionalized nickel-rich cathodes exhibit much higher cycling retentions (∼70.0%) than the cell cycled with bare nickel-rich cathode (47.1%) at high temperature. Additional systematical analyses indicate that the artificial cathode-electrolyte interphase layers effectively mitigate the electrolyte decomposition and the dissolution of transition metal components, thereby improving the cycling behavior of the cell on the basis of increased interfacial stability of nickel-rich cathode materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Artificial CEI layer was introduced by Si-based precursor on Ni-rich NCM cathode. </LI> <LI> Si-based artificial CEI layer was provided by wet coating-based one-step process. </LI> <LI> Task-specific Si–O functional groups on CEI layer were effective in F<SUP>−</SUP> scavenging. </LI> <LI> Si-based CEI layer improved interfacial stability of Ni-rich NCM cathode. </LI> <LI> Si-based artificial CEI layer allowed enhanced cycle retention at high temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
제주 자생 해양 녹조류와 갈조류 추출물로부터의 항고혈압 활성
차선희(Seon?Heui Cha),안긴내(Gin?Nae Ahn),허수진(Soo?Jin Heo),김길남(Kil?Nam Kim),이기완(Ki?Wan Lee),송춘복(Choon Bok Song),김소미(Somi K. Cho),전유진(You?Jin Jeon) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.3
제주 연안에 서식하는 해양 녹조류와 갈조류의 항고혈압 활성을 알아보기 위해 해조류로부터 메탄올과 물을 이용하여 상온(20℃)과 70℃에서 각각 4가지 종류의 추출물을 제조하여 스크리닝하였다. 그 결과, 녹조류에서는 비교적 낮은 ACE 저해활성을 보였으나, 갈조류에서는 70ME 잇바디괭생이모자반, 말미역, 바위주름, 넓패, 톳, 다시마 및 70AE 감태에서 ACE 저해활성이 높게 나타났다. 또한 70AE 감태의 가수분해물은 2.33~3.56 ㎍/mL의 IC50값을 보여 매우 높은 ACE 저해활성을 확인할 수 있었다. 이는 해조류의 ACE 저해활성이 수용성 추출물뿐만 아니라 메탄올 추출물에서도 나타나는 것은 해조류 유래 fucoxanthin, phlorotannin 및 polyphenol계 화합물 등에 의한 영향도 있을 것으로 사료된다. This study was conducted to screen in vitro angiotensin converting enzyme (ACE) inhibitory activities of methanol (MeOH) and aqueous extracts which were prepared by four different extractions-80% methanol extracts (ME) at 20℃ and 70℃, respectively and aqueous extracts (AE) at both temperatures with the residue of the MEs-of ten marine green algae and nineteen brown algae collected along Jeju coast of Korea. Most marine brown algae extracts showed higher capacities than those of marine green algae in ACE inhibitory activity. Particularly, 70℃ MeOH extract (70ME) of Hizikia fusiforme showed the strongest inhibition activity (about 87%) among all the extracts. Also, 70 MEs of Enteromorpha linza, Ishige sinicola, Laminaria ochotensis, Petrospongium rugosum, Sagrassum horneri, Undaria pinnatifida and 20℃ MeOH extracts (20ME) of Myagropsis myagroides, Petrospongium rugosum, 20℃ aqueous extracts (20AE) of Codium contractum, Enteromorpha compressa, and 70℃ aqueous extracts (70AE) of Ecklonia cava, Petrospongium rugosum showed moderate ACE inhibitory activities more than 50% and the other extracts exhibited weak activities. On the other hand, E. cava had the best ACE inhibitory activity among 70AEs. This indicates that 70AE of E. cava contains potential anti?ACE macromolecular. We tried to proteolytic digest 70AE of E. cava to induce production of anti?ACE peptides from E. cava 70AE. The enzymes used are five proteases including Kojizyme, Flavourzyme, Neutrase, Alcalase, and Protamex, which are food grade?commercial enzymes from Novo Co. Flavourzyme?digest of E. cava 70AE showed the highest inhibitory activity about 90%. And the five different enzymatic digests of the E. cava 70AE ranged from 2.33 to 3.56 ㎍/mL, respectively in IC50 values of anti?ACE activity.
실내모형시험을 통한 OPC와 친환경 MIS 그라우트의 지반 침투성능 분석
안정호(Jung-Ho Ahn),임희대(Heui-Dae Lim),최동남(Dong-Nam Choi),송영수(Young-Su Song) 대한자원환경지질학회 2012 자원환경지질 Vol.45 No.3
In this paper, a laboratory model test was conducted to evaluate grouting efficiency of ordinary portland cement(OPC) and micro cement used in MIS(Micro-Injection Process System). For this research, a injection equipment was developed for pressure permeation which can evenly simulate various grouting tests in a laboratory and suggested a standard for the production of the test specimen. Using the injection device, the laboratory injection tests of grouts were prepared with water/cement ratio of 1:1, 2:1, 3:1, 4:1, and 5:1. The analysis of injection test for pressure permeation showed that the efficiency of injection increases linearly as the water/cement ratio increases. Comparison of efficiency of the injection indicates that MIS with a relatively smaller average diameter shows more efficient injection than the OPC. In the low ratio of water/cement as 2:1~1:1, the injection efficiency of OPC was especially poor. Also, a nonlinear grout volume-injection time is represented by a hyperbolic model and grout volume predicted by hyperbolic model was compared with the value measured. From the comparison, it shows that the hyperbolic model has the potential of evaluating the efficiency of grouting. 본 연구에서는 보통 포틀랜드 시멘트 OPC(Ordinary Portland Cement)와 MIS (Micro-Injection Process System) 공법에서 사용하고 있는 마이크로 시멘트의 지반 침투성능을 평가하기 위해 실내모형시험을 수행하였다. 이를 위해 그라우트 주입을 일정한 방법으로 재현할 수 있는 가압침투주입장치를 제작하였으며 공시체 제작방법을 마련하였다. 물시멘트비를 5:1에서 1:1까지 변화하여 주입시험을 수행한 결과 물시멘트비가 증가함에 따라 침투성능이 선형적으로 증가하였으며 주입성능을 비교하면 상대적으로 비표면적이 큰 MIS가 OPC보다 동일한 배합비에서 침투성능이 우수 한 것으로 나타났다. 특히 물시멘트비가 2:1~1:1의 부배합에서 OPC의 침투성능이 매우 낮은 것으로 관찰되었다. 또 한 침투량과 주입시간과의 관계곡선을 hyperbolic으로 모델링하여 예측치를 산정하고 이를 측정치와 비교한 결과 그 라우트 성능평가에 대한 hyperbolic 모델의 잠재력이 검증되었다.