• Bulletin of the Korean Chemical Society
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• 제7권1호
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• pp.29-35
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• 1986

An empirical formula for semiconductive metal oxides is proposed relating nonstoichiometric value x to a temperature or an oxygen partial pressure such that experimental data can be represented more accurately by the formula than by the well-known Arrhenius-type equation. The proposed empirical formula is log x = A + $B{\cdot}1000/T\;+\;C{\cdot}$exp$(-D{\cdot}1000/T)$ for a temperature dependence and $log\;{\times}\;=a\;+b{\cdot}log\;Po_2\;+\;c{\cdot}$exp$(-d{\cdot}log\;Po_2)$ for an oxygen partial pressure dependence. The A, B, C, D and a, b, c, d are parameters which are evaluated by means of a best-fitting method to experimental data. Subsequently, this empirical formula has been applied to the n-type metal oxides of $Zn_{1+x}O,\; Cd_{1+x}O,\;and\;PrO_{1.8003-x}$, and the p-type metal oxides of $CoO_{1+x},\; FeO_{1+x},\;and\;Cu_2O_{1+x}$. It gives a very good agreement with the experimental data through the best-fitted parameters within 6% of relative error. It is also possible to explain approximately qualitative characters of the parameters A, B, C, D and a, b, c, d from theoretical bases.

• 대한수학회지
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• 제34권1호
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• pp.43-55
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• 1997

Suppose that D is a domain in the extended complex plane $\overline{C} = C \cup {\infty}$. For each $z_0 \in C$ and $C < r < \infty$, we let $B(z_0, r) = {z \in C : $\mid$z - z_0$\mid$ < r}$ and $S(z_0, r) = \partial B(z_0, r)$. For non-empty sets A, $B \subset \overling{C}$, diam (A) is the diameter of A and d(A, B) is the distance of A and B.

• 한국산학기술학회논문지
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• 제16권11호
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• pp.7524-7533
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• 2015

본 연구는 자색고구마 섭취와 유산소 복합운동이 비만 여중생의 건강체력, 혈중지질 및 인슐린 저항성에 미치는 영향을 알아보는데 목적이 있다. 체지방률 30% 이상의 비만 여중생을 대상으로 자색고구마섭취 운동군(A, 6명), 운동군(B, 6명), 자색고구마섭취군(C, 6명), 대조군(D, 6명) 총 24명으로 실시하였다. 건강체력, 혈중지질 및 인슐린 저항성은 사전 사후 2회 측정하였으며, 유산소 복합운동은 12주간 주 3회, 1회 70분, 40~70%HRR 강도로 실시하였다. 연구결과 집단 내 체지방률[(A(p<.01), C(p<.05) 그룹), TC[A(p<.05), B(p<.01), C(p<.01) 그룹] 및 인슐린저항성[A(p<.05) 그룹) 유의하게 감소하였고, 제지방량[A(p<.01), B(p<.01) 그룹], 근력[A(p<.01), B(p<.001), C(p<.05) 그룹], 근지구력[A(p<.05), B(p<.001) 그룹], 유연성[A(p<.05), B(p<.01) 그룹] 및 심폐지구력[A(p<.05), B(p<.001), C(p<.01) 그룹]은 유의하게 증가하였다. 집단 간 체지방률, TC 및 TG는 A그룹이 D그룹보다 유의하게(p<.05) 감소하였다. 제지방량은 A, B그룹이 C, D그룹보다 유의하게(p<.001) 증가하였다. 근력, 심폐지구력 및 HDL-C은 A그룹이 C, D그룹보다 유의하게(p<.05) 증가하였다. 유연성은 A, B그룹이 D그룹보다 유의하게(p<.05) 증가하였다. 인슐린 저항성은 A, B, C그룹이 D그룹보다 유의하게(p<.05) 감소하였다. 유산소성 복합운동과 자색고구마 섭취가 건강체력, 혈중지질 및 인슐린 저항성에 긍정적인 영향을 미쳤다.

• Applied Biological Chemistry
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• 제35권4호
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• pp.232-236
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• 1992

생대두를 이용한 발효장류의 개발을 위한 기초조사로서 대두의 처리조건을 찾고저 처리방법 [생콩(A), 수침탈각(B), 건열처리(C) 및 습열처리(D)]을 달리한 대두의 일반성분과 효소활성변화를 검토하였다. 그 결과 일반성분 중 수분함량은 A, D구가 B, C구 보다 $2.0{\sim}3.0%$, 조지방 함량은 A, B구가 C, D구 보다 약 2%, 조단백질 함량은 C, D구가 A, B구 보다 $1.16{\sim}1.74%$, 조섬유 함량은 A구가 B, C, D구 보다 $0.11{\sim}1.41%$ 많았으나, 회분은 B, C, D구가 A구 보다 0.49% 많았다. ${\alpha}-amylase$, ${\beta}-amylase$, protease, lipase 활성도는 생콩(A) 및 수침탈각(B) 구가 전열처리(C) 및 습열처리(D)구 보다 약 $2{\sim}5$배 이상 높았다. Trypsin inhibitor 활성도 크기는 $B(56.7{\sim}119.2%)>A(42.9{\sim}95.6%)>D(32.9{\sim}39.6%)>C(20.8{\sim}38.3%)$구 순이었다.

• 한국작물학회지
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• 제54권2호
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• pp.181-191
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• 2009

To investigate the genetic variation of high-and low-molecular-weight glutenin subunits (BMW-GS and LMW-GS), granule-bound starch synthase I (GBSSI) and puroindoline in 24 Korean wheat cultivars. At the BMW-GS compositions, three Glu-A1 alleles, five Glu-B1 alleles and three Glu-D1 alleles were identified. The high frequency of alleles at each locus was Glu-A1c allele (15 cultivars), Glu-B1b allele (16 cultivars) and Glu-D1f allele (16 cultivars). Four alleles were identified at the Glu-A3 and Glu-B3 loci and three at Glu-D3 locus and Glu-A3d, Glu-B3d and Glu-D3a were mainly found at each Glu-3 locus. Glu-A3d, Glu-B3d, Glu-D3b or c (4 cultivars, respectively) and Glu-A3d, Glu-B3d, Glu-D3a and Glu-A3c, Glu-B3d or h, Glu-D3a (3 cultivar, respectively) were predominantly found in Korean wheats. At the GBSS compositions, 2 waxy wheat cultivars, Shinmichal and Shinmichal1, showed null alleles on the Wx loci and other cultivars were wild type in GBSS compositions. At the puroindoline gene compositions, Korean wheat cultivars carried 3 genotypes, which 10 cultivars (41.7%) were Pina-D1a and Pinb-D1a, 11 cultivars (45.8%) had Pina-D1a and Pinb-D1b and 3 cultivars (12.5%) carried Pina-D1b and Pinb-D1a. These genetic variations could present the information to improve flour and end-use quality in Korean wheat breeding programs.

• 음성과학
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• 제14권2호
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• pp.23-33
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• 2007

This study examined the aerodynamic functions (mean airflow rate MFR, subglottal pressure Psub) and closed quotients (CQs) in the fixed pitch (C3, E3, G3, C4) with the variable loudness (70 and 80 dB) as well as in the fixed loudness at 70 dB and 80 dB with the variable pitch (C3, E3, G3, C4) in five classic male singers (Baritone). Results showed that MFR significantly increased at C3, E3, and G3 and Psub significantly increased at C4 when the loudness increased from 70 to 80 dB. At 70 dB, MFR and Psub significantly increased and CQ significantly decreased when the pitch increased from C3 to C4. At 80 dB, MFR significantly decreased when the pitch increased from C3 to G3. However, Psub showed the significant decrease with the pitch increased at 80 dB. In conclusion, as the loudness increases, the aerodynamic loss is getting higher and vocal efficiency becomes lower at low pitch than at higher pitch. At a low loudness level, the main mechanism to control loudness is the amount of medial compression of the vocal folds rather than the aerodynamic function. In addition, the aerodynamic function and medial compression of the vocal folds have a significant role in increasing the loudness level.

• Journal of the Korean Wood Science and Technology
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• 제39권1호
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• pp.53-59
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• 2011

시험 시편은 1개의 횡목과 2개의 종목이 직결나사못 2개로 연결된 접합부(Type-A)와 2개의 횡목과 2개의 종목이 4개의 직결나사못으로 연결된 접합부(Type-B)를 제작하였다. Type-B를 보강하기 위하여 횡목간의 연결부를 끝면거리 5D로 반턱이음하여 2개의 직결나사를 사용한 접합부(Type-C), 끝면거리 10D로 반턱이음한 접합부(Type-C1)와 끝면거리 10D, 직결나사 3개를 사용한 접합부(Type-C2)를 제작하였다. 압축형 전단 내력 시험결과 Type-B의 내력을 기준으로 Type-B를 보완한 Type-C는 약 30% 감소하였고, Type-C에서 끝면거리를 증가시킨 Type-C1은 Type-B와 비슷한 내력을 보였으며, Type-C1에서 직결나사못의 개수를 3개로 증가시킨 Type-C2는 Type-C1과 비교하여 1.28배 내력을 나타냈다. 기존 정각재를 이용한 옹벽의 접합부 중 긴 횡목과 짧은 횡목이 2개의 종목과 연결되는 접합부는 내력이 저하되기 때문에 이를 대체하기 위하여 실험을 실시하였다. 따라서 Type-B를 Type-C2로 대체한다면 옹벽 시공시 직결나사못에 의한 목재의 할렬, 파단과 시공시간이 줄어들고 접합 내력이 증가할 것으로 기대된다.

• Bulletin of the Korean Chemical Society
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• 제4권3호
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• pp.139-143
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• 1983

${\beta}$-N-Acetyl-D-glucosaminidase B was highly purified with the following sequence of steps; DEAE-cellulose, CM-cellulose, and Sephadex G-200 gel filtration chromatograpies. The specific activity of the purified ${\beta}$ -N-acetyl-D-glucosaminidase B was 2.2 units/mg protein with 12.9 % yield and 196.2 fold purity. The purified ${\beta}$-N-acetyl-D-glucosaminidase B showed single band on polyacrylamide gel electrophoresis. The final preparation of ${\beta}$ -N-acetyl-D-glucosaminidase B was completely free friom arylsulfatase and ${\beta}$-glucuronidase. ${\beta}$ -N-Acetyl-D-glucosaminidase B had pH optimum of 4.5 in 0.5 M sodium citrate buffer. The molecular weight of ${\beta}$-N-acetyl-D-glucosaminidase B was 133,000 by Sephadex G-200 gel filtration. The Km value of ${\beta}$-N-acetyl-D-glucosaminidase B using p-nitrophenyl-N-acetyl-${\beta}$-D-glucosaminide as substrate was 1.0 mM and $V_{max}$ was 0.014 ${\mu}$ mole/min. ${\beta}$-N-Acetyl-D-glucosaminidase B was stable at $55^{circ}C$ for 70 minutes. The crude ${\beta}$ -N-acetyl-D-glucosamiinidase in 70 % ammonium sulfate retained 93 % activity after 7 months storage at -$55^{circ}C$. Bovine serum albumin, sodium chloride, and phosphate activated ${\beta}$ -N-Acetyl-D-glucosaminidase B. N-Acetyl-D-glucosamine, ${\alpha}$-methyl-D-mannoside, and acetate inhibited ${\beta}$ -N-acetyl-D-glucosaminidase B.

• 한국통신학회논문지
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• 제25권3A호
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• pp.353-361
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• 2000

The performance of a multi-carrier CDMA system is analyzed considering frequency selective multipath fading and Near/Far effects. The number of multicarrier, multiuser, and arms of RAKE receiver, and the decay ratio of frequency selective multipath fading are used as a parameter for the performance analysis. More over, the distribution and the strength of multiuser interference are also considered. To evaluated the Near/Far effects in a multi-carrier CDMA system, three distribution models are assumed. In the first model. interference to carrier Ratio, I/C, ranges form -4 dB to 4dB, and at each 2 dB interval 20 % of multiuser is assumed to be uniformly distributed. In the second one, I/C ranges from -2 dB to 2 dB, and 33.3% of multiuser is assumed to be equally dispersed at each 2dB interval. The third model is 0 dB of I/C, that is, with perfect power control, multiuser are assumed to be evenly located. In this paper, multi-carrier CDMA system adoption RAKE receiver is proposed to mitigate the frequency selective multipath fading. Form the results, the third model(i.e. perfect power control)shows the best performance, and the narrower range of I/C causes the less effects to the desired signal, which reads to the better performance.

• 한국의류학회지
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• 제14권1호
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• pp.44-54
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• 1990

The purpose of this study was to investigate the effects of thickness of the sleeping pad on the physiological responses and the microclimate in the heating ondol room during sleeping time. The measuring points were skin temp., weight loss and body movement as physiological responses and the compression ratio, the temp. on/under the sleeping pad, the inside limp. of the sleeping quilts and subjective sence while 7 hours sleeping. Thickness of sleeping pads was 27.2 mm(A), 34.8 mm (B), 47.9 mm(C) used for 90 days and no used pad 60.7 mm(D). The floor surface temp. was keeping $29{\pm}1^{\circ}C$ while the environmental conditions was at $23{\pm}1^{\circ}C$ ($50{\pm}5\%$ R.H.) The results were as followings; 1) The mean compression ratio after using the sleeping pads for 45 days was about $70\%$ , and it wasn't increased any more thereafter 2) After 2 hours sleeping the temp. under the sleeping pads was shown that C and D were higher than A and B, and the temp. on the sleeping pads was shown that A and C pads were higher than B and D. But after 3-4 hours sleeping the skin temp. of legs was shown that B and D pads were higher than A and C. 3) Weight loss for C pad was significantly higher than others. Body movement and side position in tying was higher in A and C pads than B and D. 4) The inside temp. of quilt for A and C pads were higher in the early part of sleeping period than those of B and C pads and relative humidity was lower in C than others. 5) D pad was softer than others and fatigue degree was turned out to be lowest in D, the highest in A. From this point of view, we concluded that thickness of the sleeping Pad in the heating ondol room had different characteristic from that in no heating ondol room. And 35 mm used pad was turned out to be proper.