• KSBB Journal
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• 제19권4호
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• pp.250-256
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• 2004

본 연구에서는 C형 인지질 분해효소 (PLC)를 생산하는 것으로 알려진 각종 B. cereur (B. cereus 11, 315, 559 와 B. cereus ATCC10987)의 배양을 통해 미생물의 성장과 PLC의 생산 특성을 조사하였다. 특히, LB 배지에서 최대 PLC 생산(85 units/mL) 특성을 보인 B. cerrur 318를 이용하여 균체성장 및 PLC 생산에 적합한 배양 배지를 조사하였다. 탄소원으로는 glucose, 질소원으로는 yeast extract와 peptone, 인산과 아연의 농도는 각각 0.5∼l g/L과 0.02∼0.04 g/L이 PLC의 생산을 최대로 할 수 있는 적합한 배양액의 조성인 것으로 나타났다. 또한, B. cereus를 이용하여 PLC를 생산할 때 배양 온도는 3$0^{\circ}C$, 배양액의 pH는 7.5로 배양하는 것이 균체성장 및 PLC 생산에 효율적임을 알 수 있었다. 한편, B. cereus에 의해 생산된 PLC의 반응 특성을 연구하였는데, B. cereus 11 과 318에 의해 생산된 PLC는 45$^{\circ}C$, pH 4에서 최대 활성을 보였고, B. cereus 559에서 생산된 PLC는 5$0^{\circ}C$, pH 7에서 최대 활성을 나타냈다. B. cereus에서 생산된 PLC에 망간 이온, 코발트 이온 그리고 DMSO가 첨가되었을 때는 PLC의 활성이 상당히 증가했고, 구리 이온, glycerol, isopropanol 과 SDS등을 첨가했을 때는 PLC 활성이 감소함을 볼 수 있었다.

• 한국환경과학회지
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• 제19권2호
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• pp.209-215
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• 2010

This study is an endeavor to evaluate the risk assessment of hazardous(aflatoxin $B_1$) in medicines from oriental medical prescription which are circulated much recently. For that, twelve globular and granule types, seven liquid types of herbal medicine were bought to compare and analyze the content of aflatoxin aflatoxin B_1), which are harmful to human body. Woo Hwang Cheong Sim Hwan of Aflatoxin $B_1$ concentration lower than the standard accepted by all the products have been detected, B company(tradition) is the concentration of $1.24\;{\mu}g/kg$, C company $1.04\;{\mu}g/kg$, A company(tradition) and B company did not detect. And the general pill of aflatoxin B1 concentration lower than the standard accepted by all the products have been detected, S-1 is the concentration of $1.8\;{\mu}g/kg$, S-2 of $1.04\;{\mu}g/kg$, S-3 of $0.88\;{\mu}g/kg$, S-4 of $9.32\l\;{\mu}g/kg$, S-6 of $7.8\;{\mu}g/kg$, S-5 did not detect. All the products eundan allowed in the concentration of aflatoxin $B_1$ levels were lower than detection, D company of $0.96\;{\mu}g/kg$, E company concentration was not detected. The liquid product of aflatoxin $B_1$ concentration was found liwer than the standard accepted by all the product, L-3 concentration of $0.8\;{\mu}g/kg$, K-4 was detected in the $1.16\;{\mu}g/kg$, L-1 and L-2 is not detected, L-5 concentration of $15\;{\mu}g/kg$, L-7 is detected as $1.08\;{\mu}g/kg$ and, L-6 was not detected.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 추계학술대회 논문집
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• pp.414-417
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• 2001

Recently, developments of device using characteristics of ceramics as a new technical material is in progress. While doing so, Ultrasonic motor which is a part of research & flat-type $L_1-B_8$ mode Ultrasonic motor and measured the operation characteristics of its. The size of USM is 80*20*1.5[$mm{^1}$](length*width*thickness) and is constructed with stator by piezo-ceramics and stainless elastic body and rotator by bearings. As results of experiments, the fastest speed of revolution($\upsilon$), the maximum torque(T) and the efficiency($\eta$) were 37.5[cm/sec], 5.0[mN$\cdot$M] and 1.17[%] respectively when 27.9[kHz], 150[gf], 50[V] were applied. SO, we think this flat-type $L{_1}-B{_8}$ mode Ultrasonic motor is able to be used for applications in forwarding device of a paper or electric card so on. Key Words: Flat=type $L{_1}-B{_8}$ mode Ultrasonic Motors, Piezoelectric ceramics, forwarding device.

• Archives of Pharmacal Research
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• 제11권2호
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• pp.87-92
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• 1988

A number of substituted furodiketochroman derivatives ($lll_{a-f}$) have been synthesized by fusion of aromatic aldehydes with 5-hydroxybergapten and 5-hydroxyisopimpinellin. On the other hand, when the reaction was carried out in a solvent, the corresponding bis-furoccumarin derivatives ($lV_{c-n}$) were obtained. The anticoagulant effect of compounds $lll_{a,b,d}$ and $lv_{b,c,f,g,i,k}$ was tested. They failed to demonstrate any significant effect. The effect of the tested compounds on the arterial blood pressure was studied. Compounds $lV_c$, $lll_d$, $lll_b$, $lV_b$, $lV_k$ and $lV_i$ showed lowering effects on the normal systolic blooc pressure of anaesthetized rats in a decreasing manner.

• 한국인터넷방송통신학회논문지
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• 제15권2호
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• pp.23-29
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• 2015

$a^b{\equiv}c$(mod p)에서 a,c,p가 주어졌을 때 b를 구하는 이산대수 문제를 푸는 아기걸음-거인걸음 알고리즘은 p를 $m={\lceil}{\sqrt{p}}{\rceil}$개의 원소를 가진 m개의 블록으로 분할하고 거인 1명이 보폭 m으로 단방향으로만 $a^0$로 걸어가면서 찾는 방법이다. 본 논문은 기본적으로 p를 p/l, $a^l$ > p로 분할하고, 성인 1명이 보폭 l로 단방향으로 걸어가는 방법으로 변형시켰다. 또한, 성인 $2^k$명이 동시에 걸어가면서 b를 빠르게 찾는 방법으로 확장시켰다. 제안된 알고리즘을 $1{\leq}b{\leq}p-1$의 범위에서 $2^k$, (k=2)를 적용한 결과 기본적인 성인걸음수의 1/4로 감소시키는 효과를 얻었다. 결론적으로, 제안된 알고리즘은 아기걸음-거인걸음 알고리즘의 보폭 수를 획기적으로 단축시킬 수 있었다.

• 대한수학회논문집
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• 제21권1호
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• pp.65-74
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• 2006

In this paper, we will define the Bergman projection type operator Pr and find conditions on which the operator Pr is bound-ed on $L^p$(B, dv). By using the properties of the Bergman projection type operator Pr, we will show that if $f{\in}L_a^p$(B, dv), then $(1-{\parallel}{\omega}{\parallel}^2){\nabla}f(\omega){\cdot}z{\in}L^p(B,dv)$. We will also show that if $(1-{\parallel}{\omega}{\parallel}^2)\; \frac{{\nabla}f(\omega){\cdot}z}{},\;{\in}L^p{B,\;dv),\;then\;f{\in}L_a^p(B,\;dv)$.

• 폴리머
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• 제34권5호
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• pp.459-463
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• 2010

전신 진균감염 치료에 널리 사용되는 광범위 항진균제이며 대표적인 소수성 약물인 amphotericin B(AmB)의 효과적인 점막부착형 약물전달체로서 가용화제인 L-arginine, 점착성 고분자인 카보폴(carbopol), 온도감응성 고분자인 Poloxamer 407(P 407)로 구성된 하이드로젤 제형을 제조하였다. L-Arginine의 첨가로 AmB의 용해도가 2.6 mg/mL까지 향상되었으며, P 407 수용액은 20% w/v 이상의 농도에서 온도 변화에 따른 졸-젤-졸 상전이(phase transition)를 보였다. 이러한 상전이 온도는 약물 및 L-arginine의 존재에 의해 영향을 받았고, 점착성 고분자인 카보폴의 혼합에 의해 상전이 영역이 확장되었다. L-Arginine의 가용화 효과로 AmB의 약물방출특성이 향상되었고, 점착성 고분자인 카보폴의 첨가는 농도에 의존하여 약물방출을 지연시키는 효과가 있었다.

• 한국의류학회지
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• 제26권1호
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• pp.133-143
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• 2002

The textile industry is petting increased effort to manufacture the value-added products that gives the differentiated characters at every level of fiber and fabric production. The color is an important element to be used strategically in order to push up the value-added design. The colors of apparel products have a close relationship with the skin colors of consumers and their preference colors. This study was carried out to cluster the skin colors of the Korean women into several similar skin colors and to analyze their preference colors by the classified groups. We measured the skin colors of 354 Korean women. With color spectrometer, JX-777, we measured 4 points of the body; cheek with removing cosmetics off, forehead, rear neck and arm on the interior part near elbow. All subjects had been shown with 40 color chips and answered the preference colors and preference colors of apparel. Data were analysed to classify skin colors using K-means Cluster Analysis and Duncan test, Frequency and Chi square test on the preference colors about the clustered 3 groups. In doing so, we used in SPSS Win 10 statistical package. Findings were as fellows: 1) The skin colors of the Korean women were clustered into YR, R, and Y skin colors. The majority of the subjects, 324 observations had YR skin colors and the subjects were classified into 3 kinds of skin color groups who had YR skin colors. 2) The average skin colors of total 324 subjects was 5.23YR 6.49/4.09 in Munsell Color System(MCS), 66.56 in L value, 10.53 in a value, and 20.67 in b value. 3) The average skin color of Type 1 was 7.98YR 6.24/4.14 in MCS, 64.10 in L value, 15.05 in a value, and 24.0 in b value. For Type 2 was 7.30 YR 6.56/3.28 in MCS, 67.24 in L value, 6.89 in a value, and 18.4 in b value, and Type 3 was 7.01 YR 7.20/4.38 in MCS, 73.53 in L value, L 16.04 in a value, and 24.87 in b value. 4) The average face color of total 324 subjects was 7.31YR 6.65/3.56 in MCS, 68.13 in L value, 9.53 in a value, and 20.18 in b value. 5) The average face color of Type 1 was 4.19 YR 6.92/5.05 in MCS, 70.78 in L value, 13.2 in a value, and 25.32 in b value. For Type 2 was 5.24YR 6.33/3.79 in MCS, 64.94 in L value, 9.84 in a value, and 19.08 in b value. Type 3 was 5.4YR 6.85/4.68 in MCS, 70.1 in L value, 11.73 in a value, and 23.92 in b value. 6) The difference of mean values between the clustered 3 skin color groups showed significantly different except the a value of neck and H value of cheeks and H value of foreheads. 7) All 3 groups showed that the most preference colors and the most preference colors of apparel was 5R 4/14. and their preference colors were much more than the preference colors of apparel.

• 한국분말재료학회지
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• 제30권2호
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• pp.116-122
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• 2023

Because magnets fabricated using Nd-Fe-B exhibit excellent magnetic properties, this novel material is used in various high-tech industries. However, because of the brittleness and low formability of Nd-Fe-B magnets, the design freedom of shapes for improving the performance is limited based on conventional tooling and postprocessing. Laser-powder bed fusion (L-PBF), the most famous additive manufacturing (AM) technique, has recently emerged as a novel process for producing geometrically complex shapes of Nd-Fe-B parts owing to its high precision and good spatial resolution. However, because of the repeated thermal shock applied to the materials during L-PBF, it is difficult to fabricate a dense Nd-Fe-B magnet. In this study, a high-density (>96%) Nd-Fe-B magnet is successfully fabricated by minimizing the thermal residual stress caused by substrate heating during L-PBF.

• 대한수학회보
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• 제55권4호
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• pp.1209-1219
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• 2018

We provide a direct proof of the following theorem of Kalton, Hollenbeck, and Verbitsky [7]: let H be the Hilbert transform and let a, b be real constants. Then for 1 < p < ${\infty}$ the norm of the operator aI + bH from $L^p(\mathbb{R})$ to $L^p(\mathbb{R})$ is equal to $$\({\max_{x{\in}{\mathbb{R}}}}{\frac{{\mid}ax-b+(bx+a){\tan}{\frac{\pi}{2p}}{\mid}^p+{\mid}ax-b-(bx+a){\tan}{\frac{\pi}{2p}}{\mid}^p}{{\mid}x+{\tan}{\frac{\pi}{2p}}{\mid}^p+{\mid}x-{\tan}{\frac{\pi}{2p}}{\mid}^p}}\)^{\frac{1}{p}}$$. Our proof avoids passing through the analogous result for the conjugate function on the circle, as in [7], and is given directly on the line. We also provide new approximate extremals for aI + bH in the case p > 2.