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Monolithic Integrated Amplifier for Millimeter Wave Band (밀리미터파 대역 단일 집적 증폭기)

  • Ji, Hong-Gu;Oh, Seung-Hyeub
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.10
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    • pp.3917-3922
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    • 2010
  • In this paper, 3 stage amplifier MMIC was designed and fabricated with U-band optimized epitaxal pHEMT that produced by large signal characterization and modeling for 60 GHz band. The pHEMT used in this paper, the gate $0.12\;{\mu}m$ length and total gate width of $100\;{\mu}m$, $200\;{\mu}m$ has been modeled using the large signal designed with negative feedback and MCLF instead of MIM capacitor for improving stability. Fabricated MMIC $2.5{\times}1.5mm^2$ size, current about 40 mA, operating frequency 59.5~60.5 GHz, gain 19.9~18.6 dB, input matching characteristics -14.6~-14.7 dB, output matching characteristics -11.9~-16.3 dB and output -5 dBm characteristics were obtained.

8B/10B Encoder Design by Coding Table Reduction (코딩테이블 축소방법에 의한 8B/10B 인코더 설계)

  • Shin, Beom-Seok;Kim, Yong-Woo;Yoon, Kwang-Sub;Kang, Jin-Ku
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.4
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    • pp.43-48
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    • 2008
  • This paper presents a design of 8B/10B encoder by the coding table reduction. The proposed encoder has reduced coding table modified disparity control block. Logic simulation and synthesis have been done for the proposed design. After synthesized using Magna CMOS $0.18{\mu}m$ process, the proposed design achieved the operating frequency of 343MHz and chip area of $1886{\mu}m^2$.

Parameter Analysis for Receiving System of Digital Mobile Communication (디지털 이동통신의 수신 시스템에 대한 파라미터 분석)

  • 주재한
    • Journal of the Korea Computer Industry Society
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    • v.2 no.7
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    • pp.895-904
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    • 2001
  • In this study, gain can be high because an active double balance mixer was used. Receiving system II was made with receiving system I of low IIP3, a passive double balance mixer which has low gain and high IIP3, and an intermediate frequency amplifier for enhancing the low gain. The result of simulating receiving parameter is as follows: the total NF of receiving system I was 6.4382dB, gain was 53.5dB, and IIP3 was -6.6352dB m. As for the receiving system II, the total NF was 9.70672dB, gain was 47dB, and IIP3 was 3.66729dB m.

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Studies on the Penetration, Diffusion Ability and Effect of Insects Control Using the Methyl Bromide in the Vertical Silo (수직사이로에 있어 MB훈증제의 침투확산성 및 살충효과 시험)

  • Hah J.K.;Kim J.T.;CHO N.K.;Kim B.H.
    • Korean journal of applied entomology
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    • v.20 no.4 s.49
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    • pp.212-216
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    • 1981
  • This experiment was carried out to investigate the penetration velocity and diffusion ability of methyl bromide fumigants under the condition of natural gravity, and the effect of in control of yellow corn in the vortical silo. The results were as fallows 1. The methyl bromide remainded concentration on the surface of the vertical silo was rapidly reduced from over 100mg/l to under 20mg/l, within 2 hours after supplying methyl bromide fumigant 2. Even 3m depth place from the surface of the vertical silo filled with yellolw corn was well penetrated within 30 minutes, but its remained methyl bromide gas was reduced gradually from over 100mg/l to 30mg/l after 12 hours duration. 5. In case of 13m place tile penetration ability of methyl bromide was over 100mg/l within one hour and kept the same concentration of it for 12 hours, its remainded methyl bromide preserved over 40mg/l until 48 duration time. 4. Less methyl bromide gas was detected at the bottom place than 3m and 13m depth of the vertical silo. It showed bellow 20mg/l of methyl bromide gas only through the whole duration time. 5. Comparing to the vertical penetration velocity of mehtyl bromide gas, the horizontal diffusion ability was not so good. Therefore, remained methyl bromide gas of 3m depth at the wall side of silo was about half than that of center circle where the nearer place from the methyl bromide supplying point, and the methyl bromide gas of 13m depth placed center circle was detected about 15 to 20 times than that of wall side. 6. For the purpose of examining the mortality of methyl bromide, the testing insects (Lesser Rice weevil and confused flour beetle) placed on the surface and bottom side of the silo were killed completely after 24 hrs fumigation, and the same results showed also at the 3m, 7m and 13m depth after 48 hrs fumigation.

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Kinetic Analysis of Cathepsin B Inhibitor Using a Spectrophotometric Assay (분광광도법에 의한 Cathepsin B 저해물질의 효소동력학적 저해특성 조사)

  • 한길환;김상달
    • Microbiology and Biotechnology Letters
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    • v.29 no.2
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    • pp.90-95
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    • 2001
  • Kinetic Analysis of Cathepsin B Inhibitor Using a Spectrophotometric Assay. Han, Kil-Hwan and SangDal Kim*. Department of Applied MicrobioJ0f5Yt Yeungnam UniversitYt Kyongsan 77 2-749, Korea - The KHS 10, C4Hl10~6 formula produced from Streptomyces luteogriseus KT-] 0 effectively inhibited a lysosomal cysteine proteinase, cathepsin B. It inhibited the enzyme activity of cathepsin B competitively when the N a-CBZ-Llysine p-nitrophenyl ester HC] (CLN) was used as a substrate. The inhibition const:mt (Ki) of KHS 1 0 for cathepsin B detennined by spectrophotometeric assay was 430 nM. The effective inhibition of cathepsin B was observed at $25^{\circ}C$ :md pH 6.0. The cathepsin B inhibitor, KHSlO needed a preincubation of cathepsin B with the inhibitor for over 5 min. The KHS 10 preserved over 80% inhibition activity even after heat-treatment at $100^{\circ}C$ for ] hr.

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The Feasibility of Cathepsin B Level in Preoperatively Screening Patients with Thyroid Cancer and Nodular Hyperplasia (갑상선암 및 결절성 증식증 환자의 수술전 스크리닝을 위한 cathepsin B의 발현 양상)

  • Choi, Young-Sik;Kim, Young-Ok;Kim, Woo-Mi
    • Journal of Life Science
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    • v.19 no.11
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    • pp.1514-1521
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    • 2009
  • To evaluate the feasibility of cathepsin-B levels in preoperatively screening patients with thyroid cancer, we assigned these patients to either the thyroid cancer group (n=32) or the nodular hyperplasia group (n=7). Five healthy volunteers served as controls (n=5). We quantified cathepsin-B expressions in cancerous lesions with follicular carcinoma and hyperplastic lesions with nodular hyperplasia, and compared the degrees to those of normal thyroid tissue, which was obtained from matched contralateral lobe. The activity of serum cathepsin B was significantly higher in patients with thyroid carcinoma ($284.87{\pm}79.32$, ${\times}10^{-2}\;mU$) and those with nodular hyperplasia ($255.45{\pm}95.68$, ${\times}10^{-2}\;mU$) than compared to normal control ($168.94{\pm}15.10$, ${\times}10^{-2}\;mU$) (p<0.05). Based on the results of immunoassay, the concentrations of cathepsin B in the thyroid cancer group ($15.50{\pm}7.86\;ng/ml$) and the nodular hyperplasia group ($17.64{\pm}7.49\;ng/ml$) were higher than those of the control group ($4.85{\pm}0.61\;ng/ml$). The degree of cathepsin-B mRNA expression was significantly higher in cancerous or hyperplastic lesions than normal thyroid tissues from matched contralateral lobe with follicular carcinoma or non-neoplastic thyroid disease. Our results indicate that the activity of serum cathepsin B is a useful indicator in screening patients with nodular hyperplasia or neoplastic thyroid disease and it may be involved in the abnormal proliferation of cells.

COMMUTATORS OF THE MAXIMAL FUNCTIONS ON BANACH FUNCTION SPACES

  • Mujdat Agcayazi;Pu Zhang
    • Bulletin of the Korean Mathematical Society
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    • v.60 no.5
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    • pp.1391-1408
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    • 2023
  • Let M and M# be Hardy-Littlewood maximal operator and sharp maximal operator, respectively. In this article, we present necessary and sufficient conditions for the boundedness properties for commutator operators [M, b] and [M#, b] in a general context of Banach function spaces when b belongs to BMO(?n) spaces. Some applications of the results on weighted Lebesgue spaces, variable Lebesgue spaces, Orlicz spaces and Musielak-Orlicz spaces are also given.

APPROXIMATION OF CONVEX POLYGONS

  • Lee, Young-Soo
    • Journal of applied mathematics & informatics
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    • v.10 no.1_2
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    • pp.245-250
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    • 2002
  • Consider the Convex Polygon Pm={Al , A2, ‥‥, Am} With Vertex points A$\_$i/ = (a$\_$i/, b$\_$i/),i : 1,‥‥, m, interior P$\^$0/$\_$m/, and length of perimeter denoted by L(P$\_$m/). Let R$\_$n/ = {B$_1$,B$_2$,‥‥,B$\_$n/), where B$\_$i/=(x$\_$i/,y$\_$I/), i =1,‥‥, n, denote a regular polygon with n sides of equal length and equal interior angle. Kaiser[4] used the regular polygon R$\_$n/ to approximate P$\_$m/, and the problem examined in his work is to position R$\_$n/ with respect to P$\_$m/ to minimize the area of the symmetric difference between the two figures. In this paper we give the quality of a approximating regular polygon R$\_$n/ to approximate P$\_$m/.

Studies on the Development of the Bacillus thuringiensis is Pesticide - Conditions of delta- endotoxin production by B. thuringiensis serovar kurstaki- (Bacillus thuringiensis 살충제 개발에 관한 연구 -B. thuringiensis serovar kurstaki 내독소 생산 배지조건-)

  • 이형환;현병윤;오창근
    • Microbiology and Biotechnology Letters
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    • v.14 no.3
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    • pp.259-264
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    • 1986
  • The compositions of the four madia and their pHs for delta endotoxin production by B. thuringiensis serovar kurstaki 3a3b were examined. In the M-4 media out of the 4 media at pH8, the production of the endotoxin and spore formation were maximal. The mean generation times of the bacterium were 53.4 minutes in the M-1 media, 98 in the M-2, 132 in the M-3, and 127.5 in the M-4. The proper pHs of the media for the endotoxin production appeared to be pH 7 to 8. In the M-4 media, the lag time lasted about 5 hours.

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The Theoretical Analyses of the Soil Erosion and Conservation 2. The Theoretical Expresion of Erosion Tolerance for the Soil Conservation (토양의 침식과 보존에 관한 이론적 분석 2. 토양침식의 내성에 관한 이론)

  • 장남기
    • Asian Journal of Turfgrass Science
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    • v.10 no.1
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    • pp.31-40
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    • 1996
  • The mechanical expresion provides for the use of Soil property reserves and permanent protec-tion or improvement of soil resources in accordance with measurable standards. If the functions I (initial soil property), E (soil erosion), R (soil renewal), and M. (minimum allowable value) are assumed to be integrable in region A, erosion tolerance over a region is leaded to ${\int}_A{\int}I(m, cl, re, ch, b)dA-{\int}_A{\int}{\{\int}_{to}^{\infty}[E(w, re, c, re, ch, b, t)-R(m, ch, re, b, t)]dt}\dA{\geqq}{\int}_A{\int}M_i(m, cl, re, ch, b)dA$ were variable factors are m=parent material of soil, cl=climate, re=relief or topography, ch=soil characteristics, r=rain or water, w=wind, b=biota, and t=time.

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