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이상곤,김윤근 東西大學校 2001 동서논문집 Vol.7 No.-
In this paper, we developed elliptic curve crypto system software package runnable on a java card and implemented ECDSA algorithm. Two versions, 16-bit version and 32bit version, are developed. The package includes addition, multiplication, inversion, and polynonlial modular arithmethic libaranes based on F2˝ and polynomial bases. The package also includes addition, subtraction, and scalar multiplication arithmetlc libraries over affine coordinate of elliptical curve. We used this library to implement ECDSA.
길쌈부호의 부등비트오율이 고려된 DPCM의 신호대 잡음비
李相坤,崔閏喆,文相在 慶北大學校 1990 論文集 Vol.49 No.-
This paper presents that the signal to noise ratio of DPCM is theoretically examined in the case that bit error rates of individual bits consisting of the information word are different from one another. It is investigated through the computer simulation where the inputs are speech signal. The SNR performance of DPCM can be improved by using the property of the unequal bit error probabliity.
Lee, Tae-Gon,Lee, Ho-Jun,Kim, Sun-Woo,Kim, Dae-Hyeon,Han, Seung Ho,Kang, Hyung-Won,Kang, Chong-Yun,Nahm, Sahn Elsevier Science Publishers 2017 Journal of the European Ceramic Society Vol. No.
<P><B>Abstract</B></P> <P>The piezoelectric properties of (1-x-y)PbZrO<SUB>3</SUB>-xPbTiO<SUB>3</SUB>-yPb(Ni<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O<SUB>3</SUB> ceramics were investigated. Specimens with a large Pb(Ni<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O<SUB>3</SUB> content, which have compositions close to the triple point, show small <I>g<SUB>33</SUB> </I> and <I>d<SUB>33</SUB> </I> ×<I> g<SUB>33</SUB> </I> values because of their large <I>ε<SUP>T</SUP> <SUB>33</SUB>/ε<SUB>0</SUB> </I>. These values increased with a decrease in y (amount of Pb(Ni<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O<SUB>3</SUB>) and the specimen with x=0.39 and y=0.29 showed the largest <I>g<SUB>33</SUB> </I> of 43×10<SUP>−3</SUP> V<B>·</B>m/N and <I>d<SUB>33</SUB> </I> ×<I> g<SUB>33</SUB> </I> of 25.2×10<SUP>−12</SUP> m<SUP>2</SUP>/N. Cantilever-type energy harvesters were fabricated using specimens with 0.38≤x≤0.41 and y=0.29. The output power densities of the energy harvesters were related to the <I>d<SUB>31</SUB> </I> ×<I> g<SUB>31</SUB> </I> ×<I> k<SUB>31</SUB> </I> <SUP>2</SUP> value of the piezoelectric ceramics. The energy harvester fabricated using a specimen with x=0.39 and y=0.29, which has a maximum <I>d<SUB>31</SUB> </I> ×<I> g<SUB>31</SUB> </I> ×<I> k<SUB>31</SUB> </I> <SUP>2</SUP> value, showed the maximum output power density of 1.01mW/cm<SUP>3</SUP>.</P>
Hydride bed control: Understanding of hydride bed using tank efflux
Yun, Sei-Hun,Chang, Min Ho,Kang, Hyun-Goo,Chung, Dongyou,Lee, Hyeon Gon,Jung, Ki Jung,Chung, Hongsuk,Song, Kyu-Min,Lee, Euy Soo,Lee, In-Beum,Park, Byeong Eon Elsevier 2017 International journal of hydrogen energy Vol.42 No.12
<P><B>Abstract</B></P> <P>Control of dehydriding (desorption of hydrogen or hydrogen isotope) rate from a hydride bed in fusion fuel cycle is one important design point to estimate a real supplying amount of hydrogen from the hydride bed. In a real system tens of batch-type hydride beds are to be utilized for supplying a certain amount of hydrogen isotope at the same time. A study on efflux time from a hydraulic water tank was applied as a fundamental similarity test of the gas fueling system. As a result, liquid efflux from a tank shows a similar behavior with the desorption pattern of the depleted uranium hydride bed system. As much important as keeping a hydride buffer vessel pressure in a hydride bed system, similar tendency was studied in the tank efflux system; i.e., to keep the secondary vessel height there needs a certain amount of liquid flow from the upper tank and the tank height difference. From one tank with connected another tank flow with understanding of tank efflux model a complicated multi-tanks behavior could be understood by simulating its complex efflux characteristics, and it is likely to be applied to the multi-hydride beds system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Understanding of dehydriding from a hydride bed using tank efflux. </LI> <LI> Similar pattern shows between depleted uranium dehydriding and liquid efflux. </LI> <LI> Supplying a stable fueling rate is of importance to keep the secondary buffer level. </LI> <LI> Dehydriding behavior in multi-hydride bed was studied using multi-tank efflux. </LI> <LI> Multi-efflux seems to be substituted for control study on multi-dehydriding system. </LI> </UL> </P>
Lee, Tae-Gon,Lee, Ho-Jun,Kim, Sun-Woo,Kim, Dae-Hyeon,Lee, Ku-Tak,Kang, Chong-Yun,Kim, Miso,Nahm, Sahn Institute of Physics Publishing 2018 Smart materials & structures Vol.27 No.11
<P>Ring-type 33-mode piezoelectric energy harvesters (PEHs) were fabricated using Pb(Zr,Ti)O<SUB>3</SUB>- and (Na,K)NbO<SUB>3</SUB>-based piezoelectric ceramics. The relationship between the output performance of the PEH and the piezoelectric properties of the ceramics was investigated. Ring-type PEHs were selected for this investigation because they can be mounted on a specimen holder at the same position, ensuring structurally reliable output performance. The <img ALIGN='MIDDLE' ALT='${{{k}_{{eff}^{}}}^{2}}^{}$' SRC='http://ej.iop.org/images/0964-1726/27/11/115027/smsaae6a6ieqn1.gif'/>?×?<I>Q</I> <SUB> <I>m</I> </SUB>/<img ALIGN='MIDDLE' ALT='${{s}^{E}}_{33}$' SRC='http://ej.iop.org/images/0964-1726/27/11/115027/smsaae6a6ieqn2.gif'/> value, which was reported as a figure of merit (FOM) of the PEH under resonance condition, could not adequately explain the output performances of the 33-mode PEH with a specimen holder much larger than the size of the specimen. The <I>d</I> <SUB>33</SUB>?×?<I>g</I> <SUB>33</SUB> value, which is a FOM derived from the theoretical output power of the 33-mode PEH, can explain the variation of the output power of the 33-mode PEH with a large specimen holder. However, since the variation of the output power was more accurately explained by the <I>d</I> <SUB>33</SUB>?×?<I>g</I> <SUB>33</SUB>?×?<img ALIGN='MIDDLE' ALT='${{k}_{eff}}^{2}$' SRC='http://ej.iop.org/images/0964-1726/27/11/115027/smsaae6a6ieqn3.gif'/> value, this was suggested as a new FOM of the output power of the ring-type 33-mode PEH with a large specimen holder.</P>
Lee, Yun-Kyoung,Lee, Won Sup,Kim, Gon Sup,Park, Ock Jin National Hellenic Research Foundation 2010 ONCOLOGY REPORTS Vol.24 No.6
<P>AMP-activated protein kinase (AMPK) has emerged as a therapeutic target of cancer. AMPK functions as an upstream regulator of proliferative signals such as mammalian target of rapamycin (mTOR), tuberous sclerosis complex (TSC), p70S6 and elongation factor-2, indicating that AMPK can be applied for the inhibition of cancer cell proliferation via modulating the proliferative signaling network. The Akt/mTOR signaling pathway is activated in colon cancer. The well known mTOR inhibitor rapamycin has a disadvantage of feedback stimulation of Akt. Anthocyanins are naturally-occurring mTOR inhibitor possessing Akt inhibitory activities. We have investigated the mTOR inhibitory effect of anthocyanins through the activation of AMPK. In this study, anthocyanins were applied to colon cancer cells and tumor-bearing xenograft models to investigate their anti-proliferative and pro-apoptotic effects, and elucidate the mechanisms that link AMP-activated protein kinase (AMPK) 관1 activation to the survival signal of mTOR. Our results indicated that anthocyanins significantly decreased phospho-mTOR comparable to rapamycin, a synthetic mTOR inhibitor, and this inhibitory effect of anthocyanins on mTOR was completely abrogated by inactivating AMPK관1. Furthermore, suppression of cell growth with anthocyanins was also alleviated in the absence of noticeable AMPK관1 activities. For the first time we have found anthocyanins as novel AMPK관1 activators, and in conditions of AMPK관1 inactivation, anthocyanins lost their ability to inhibit mTOR in HT-29 colon cancer cells. The activation of AMPK관1, and the deactivation of mTOR and Akt were observed in anthocyanins-treated tumor-bearing xenograft models. The results from this study suggest that there is a complex interaction between AMPK관1 and mTOR signaling, and anthocyanins are powerful AMPK관1 activators that inhibit cancer cell growth by inhibiting mTOR phosphorylation.</P>