• 한국정보통신학회논문지
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• 제7권8호
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• pp.1591-1597
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• 2003

본 논문에서는 HEMT(Agilent ATF­34143)를 이용한 부성저항 특성을 갖는 능동 인덕터와 캐패시터를 이용해 능동 공진 발진기 제작에 응용하였다. 5.5GHz 대역에서 능동 인덕터는 ­25$\Omega$의 부성저항과 2.4nH의 인덕턴스를 갖고, 능동 캐패시터는 ­14$\Omega$의 부성저항과 0.35pF의 캐패시턴스를 갖도록 설계하였다. 설계된 능동 인덕터와 캐패시터를 이용 5.8GHz ISM 대역의 국부 발진기로 사용 가능한 능동 공진 발진기를 설계하였다. 애질런트사의 ADS 2002C를 이용 시뮬레이션 하였다. 설계된 발진기는 유전율 3.38, 유전체 두께 0.508mm, 금속 두께 0.018mm인 기판위에 HMIC 형태로 구현하였다. 제작된 능동 공진 발진기는 5.68GHz의 기본 발진주파수에서 ­3.6㏈m의 출력을 얻었고, 100KHz 옵셋에서 ­81㏈c1/Hz의 위상잡음 특성을 갖는다.

• 한국방재학회 논문집
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• 제10권3호
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• pp.31-38
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• 2010

본 연구에서는 교량 구조물-궤도 종방향 상호작용, 교량 구조물-차량 상호작용을 고려한 신뢰성 최적설계 방법을 제안하고, 알고리즘의 개발을 통하여 본 연구에서 제안한 방법의 효율성을 검증하였다. 구조해석 프로그램은 ABAQUS를 사용하였으며, 최적화 방법은 Automated Design Synthesis(ADS)에서 신뢰성면에서 우수한 ALM-BFGS방법을 사용하였다. 일반적으로 ALM-BFGS방법은 최적해 방향을 탐색하는데 있어 1방향 탐색을 하지 않으며 Push-Off Factor 값이 보통 0.1~0.2에서 대부분 수렴하나 본 연구에서는 'Heuristic Decision Method' 의하여 결정된 Push-Off Factor 값이 90일 때 1방향 탐색인 Golden Section Method의 적용이 필요하였으며, 알고리즘이 잘 수렴함을 확인하였다. 구조물-궤도 종방향 상호작용, 구조물-차량의 상호작용에 의한 응답을 제약조건으로 설정하여 단면 설계시 반영될 수 있도록 하였다. 본 연구는 구조물-궤도 종방향 상호작용 및 구조물-차량 상호작용을 고려한 설계기법에 대한 효율성 및 경제성을 증명하기 위하여 5${\times}$(1@50m) 2주형 강합성 거더교에 대한 최적설계를 수행하였으며, 본 연구에서 제안하는 상호작용을 고려하는 설계기법이 기존의 상호작용을 고려하지 않은 설계방법보다 경제적이며 효율적임을 확인하였다.

• Asia Marketing Journal
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• 제17권2호
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• pp.1-13
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• 2015

It is becoming increasingly difficult for advertisers to reach target consumers because memory for an ad is inhibited in the presence of competing ads. While previous studies have focused on ad repetition as a factor that can reduce competitive interference, this study focuses on ad distinctiveness. We compare the effects of ad distinctiveness on recall for the ad and its competing ad in high competitive ad environments with those in relatively low competitive ad environments. Regarding the effect of ad distinctiveness on recall for the focal ad, the results show that when an advertiser makes its ad distinctive, recall for its own ad is enhanced in both high and low competitive ad environments although the positive effect is relatively weak in high competitive environments. The results also show that, regarding the effect of ad distinctiveness on recall for its competing ad, when an advertiser makes its ad distinctive, recall for its competing ad is enhanced in low competitive ad environments rather than in high competitive ad environments.

• Toxicological Research
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• 제13권4호
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• pp.339-347
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• 1997

Disulfiram (DSF) and diethyldithiocarbamate (DDC), a reduced form of DSF, protect the liver against toxicant-induced injury through inhibition of cytochrome P450 2E1. The effect of DSF and DDC on the levels of major hepatic microsomal epoxide hydrolase (mEH) and glutathione S-transferase (GST) expression was comparatively studied, given the view that these enzymes are involved in terminal detoxification events for high energy intermediates of xenobiotics. Treatment of rats with a single dose of DSF (20-200 mg/kg, po) resulted in 2- to 15-fold increases in the mEH mRNA level at 24 hr with the ED$_{50}$ value being noted as 60 mg/kg. The mEH mRNA level was elevated ~15-fold at 24 hr after treatment at the dose of 100 mg/kg, whereas the hepatic mRNA level was rather decreased from the maximum at the dose of 200 mg/kg, indicating that DSF might cause cytotoxicity at the dose. In contrast to the effect of DSF, DDC only minimally elevated the mEH mRNA level at the doses employed. DSF moderately increased the major GST mRNA levels in the liver as a function of dose, resulting in rGSTA2, rGSTA3/5 or rGSTM1 mRNA levels being elevated 3- to 4-fold at 24 hr post-treatment, whereas the rGSTM2 mRNA level was not altered. DDC, however, failed to stimulate the mRNA levels for major GST subunits, indicating that the reduced form of DSF was ineffective in stimulating the GST the expression. The effect of other organosulfides including aldrithiol, 2, 2'-dithiobis(benzothiazole) (DTB), tetramethylthiouram disulfide (TMTD) and allyl disulfide (ADS) on the hepatic mEH and GST mRNA expression was assessed in rats in order to further confirm the increase in the gene expression by other disulfides. Treatment of rats with aldrithiol (100 mg/kg, po) resulted in a 16-fold increase in the mEH mRNA level at 24 hr post-treatment. DTB, TMTD and ADS also caused 5-, 9- and 12-fold increases in the rnRNA level, respectively, as compared to control. Thus, all of the disulfides examined were active in stimulating the mEH gene in the liver. The organosulfides significantly increased the rGSTA2, rGSTA3, rGSTA5 and rGSTM1 mRNA levels at 24 hr after administration. In particular, aldrithiol was very efficient in stimulating the rGSTA and rGSTM genes among the disulfides examined. These results provide evidence that DSF and other sulfides effectively stimulate the mEH and major GST gene expression at early times in the liver and that DDC, a reduced form of DSF, was ineffective in stimulating the expression of the genes, supporting the conclusion that reduced form(s) of organosulfur compound(s) might be less effective in inducing the mEH and GST genes through the antioxidant responsive element(s).

• Journal of Electrochemical Science and Technology
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• 제13권1호
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• pp.138-147
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• 2022

The synergistic effect of 2-chloromethylbenzimidazole (2-CBI) and potassium iodide (KI) for mild steel in 1 M hydrochloric acid solution was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that, with the addition of 100 ppm potassium iodide, the inhibition efficiecy (IE) of 100 ppm 2-CBI in 1 M hydrochloric acid had been improved from 91.14% to 96.15%. And synergistic parameter of 100 ppm 2-CBI with different amounts of potassium iodide is always greater than 1. The adsorption of potassium iodide combining with 100 ppm 2-CBI obeys to the Langmuir adsorption isotherm. Thermodynamic adsorption parameters, including ∆G⁰_ads, ∆H_a and ∆S_a of the adsorption of the combinned inhibitor, as well as the E_a of the mild steel corrosion in 1 M HCl with the combinned inhibitor, were calculated.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.189-192
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• 2001

In this paper, We designed and implemented 20 watt high power amplifier which can be used for the commercial services in band of 1.86 ~ 1.870Hz at PCS. In order to satisfy ACPR, We designed by using the ADS(Advanced Design System)ver1.3. The HPA is fabricated on tepron substrate($\varepsilon_{{\gamma}}$ =3.15, H=0.78mm, T=0.02mm). The implemented HPA measured The ACPR characteristics at $\pm$ 885kHz, $\pm$ 1.25MHz, $\pm$2.25MHz. The HPA meets specification with good ACPR. The HPA is expected to use as a commercial product of PCS base station.roduct of PCS base station.

• Journal of Plant Biotechnology
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• 제49권4호
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• pp.307-315
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• 2022

개똥쑥은 말라리아 등 다양한 질병의 치료물질인 artemisinin 제공하나, 식물체 내 농도가 낮고, 생산이 불안정하여 국제적 수요에 대응하지 못하고 있다. 재배환경을 인공적으로 제어하는 식물공장 시스템은 계절이나 장소에 제한 없이 약용식물의 공장식 생산체계가 가능하다(Kim 2010). 본 연구에서는 식물공장에서 개똥쑥의 artemisinin의 대량생산이 가능한 최적의 조건을 찾기 위하여 파종부터 수확까지 적색광(R)과 청색광(B)을 혼합한 3종류의 LED (R : B = 6 : 4, 7 : 3, 8 : 2)에서 생장 및 물질생산에 적합한 광조건을 탐색하였다. 개똥쑥의 수확 전, 1,395 ㎼/cm²의 UV-B, 4℃의 저온, 그리고 건조 처리로 식물에 hormesis를 유도하여 artemisinin의 생산 증가를 확인하였다. Artemisinin 생합성에 관여하는 효소들 중에서 ADS, CYP, ALDH1의 발현량을 qPCR로 측정하였고, artemisinin 정량을 통해 전사체와 대사물질의 연관성을 확인하고, artemisinin 생산에 적합한 재배 광조건과 hormesis 처리 조건을 탐색하였다. 3종의 LED 비율 중 8 : 2에서 높은 생체중 및 건물중을 생산했으며, hormesis를 유도하기 위한 3종의 물리 처리에서 이를 통해 7 : 3 식물을 수확전 6시간 건조처리했을 때 artemisinin 함량이 약 2배 증가하였다.

• 전기화학회지
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• 제2권3호
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• pp.144-149
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• 1999

0.2M LiOH전해질 내의 다결정 Ir표면에서 저전위 및 과전위 전착된 수소(UPD H및 OPD H)의 전이와 2구별되는 흡착부위를 위상이동 방법을 이용하여 연구하였다 순방향과 역방향 주사시, 순환 전압전류도에 UPD H 봉우리가 나타난다. 위상이동 변화 또는 Langmuir흡착등온식에 전이영역(-0.80 to -0.95 V vs. SCE)이 나타난다. 전이영역(-0.80 to -0.95 V vs. SCE)에서 수소 흡착평형상수(K)는 $7.9\tiems10^{-2}$에서 $1.5\times10^{-4}$또는 $1.5\times10^{-4}$에서 $7.9\times10^{-2}$로 전이한다. 마찬가지로, 수소 흡착표준자유에너지$({\Delta}G_{ads})$도 6.3kJ/mol에서 21.8kJ/mol 또는 21.8kJ/mol에서 6.3kJ/mol로 전이한다. 다결정 Ir표면에서 UPD H와 OPD H는 구별이 가능한 2종류의 전착된 수소같이 작용한다. UPD H봉우리와 전이영역은 다결정 Ir 표면에서 UPD H와 OPD H의 2 구별되는 흡착부위에 기인한다.

• 복식
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• 제50권6호
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• pp.143-153
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• 2000

The purpose of this study was to find out the relationship among the frequency of perfume usage and perfume attitude. perfume consuming behaviors and demographies. The data were collected from 352 female college students using questionnaire. Three groups including Large amount users(30.1%), Medium amount users(33.8%), and Small amount users(36.1%) were identified by the frequency of perfume usage. The results were summarized as follows : 1. There were significant differences on perfume attitudes and perfume consuming behaviors among the three groups. The more they use perfume, the more they feel pleasure and self-confidence. Most subjects preferred overseas prestige and popular perfume. And they obtained perfume informations through magazine ads and article. 2. There were significant differences demographic characteristics among the three groups. The older and the higher social status frequently used perfume. This study will provide useful marketing data and implications for activation of domestic perfume market.

• 한국의류학회지
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• 제17권3호
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• pp.491-505
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• 1993

The influences of protease on the removal of various protein soils from cotton fabrics were studied. The human epidermal stratum corneum, hemoglobin and casein were used as protein soils. The soiled fabrics were denatured by steaming for 30 min. before washing and laundered using Terg-O-Tometer under washing conditions. The removal efficiency was evaluated by analysis of protein on the fabrics before and after washing by means of copper-Folin method. The relations between the removal and the characteristics of protease were discussed. Also the degradation of protein were examined by microscopy. The seperation of human epidermal stratum corneum after hydrolysis was examined by SDS-PAGE. The results obtained were as follow : 1. The protein from the soiled cotton fabric was removed effectively by adding protease. The removal of protein was increased in proportion to increasing of the enzyme concentration up to a certain point, but it began to decrease above the point. The removal effect was high in the order of casein>human epidermal stratum corneum>hemoglobin. Especially the protein was more effectively removed in ADS solution(pH 9.5) containing enzyme. 2. When protease was used with ADS. the removal of protein was efficiently showed in relatively short time(5~15min.) compared to using ADS only. It is due to the properties of this enzyme that reacts with very short time. 3. Even at low temperature the removal efficiency of enzyme was relatively higher compared with the activity of enzyme. The removal of protein soil was increased up to a maximum near $50^{\circ}C$, and then decreased. 4. The removal of protein by protease was improved with the increase of alkalinity in the pH range from 9.5 to 11.0 but it began to decrease above pH 11.0. 5. According to the increase of mechanical agitation, the removal effect was increased. But the removal efficiency of protease was more effective compared with the agitation in detergency. 6. According to the SDS-PAGE separation and micrograph it was confirmed that the human epidermal corneum was effectively hydrolysed by the enzyme added. So the fragments of protein were removed more efficiently by means of the interfacial reaction of AOS.