An interface circuit designed for the load cell

Chung, Won Sup 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.23 No.2

저항형 센서 브리지들을 위한 브리지 저항 편차-펄스폭 변환기를 제시한다. 이 변환기는 두 개의 전압-전류 변환기, 두 개의 전류-제어 슈미트 트리거, 하나의 램프 적분기, 그리고 두 개의 로직 게이트로 이루어져 있다. 개별 부품들을 사용하여 제작된 실험회로는 4.68 ms/Ω에 달하는 변환 감도와 ±0.03%보다 적은 선형 오차를 나타냈다. 브리지 저항 편차-펄스폭 변환기를 로드셀에 응용한 예도 제시하였다. A bridge resistance deviation-to-pulse width is presented for interfacing resistive sensor bridges. It consists of two voltage-to-current converters, two current-tunable Schmitt triggers, a ramp integrator, and two logic gates. A prototype circuit built using discrete components exhibits a conversion sensitivity amounting to 4.68 ms/Ω and a linearity error less than ±0.03 %. Its application to a load cell is also presented.

인천항 자유무역지역 추가지정을 위한 타당성 연구

정태원 ( Chung Tea-won ) 한국해운물류학회 2021 해운물류연구 Vol.37 No.3

본 연구는 인천항의 경쟁력 확보를 위한 자유무역지역 추가지정 타당성 검토를 통하여 글로벌 물류환경 변화에 대응하고 경쟁력 있는 인천항 자유무역지역을 육성하는 것을 목적으로 하였다. 인천항 항만배후물류단지 자유무역지역 추가 지정 지역을 도출한 결과 인천신항 1-1단계 1구역, 3구역, 1-2단계와 인천남항 아암물류 2단지 1-1단계 1구역이 추가적으로 자유무역지역으로 지정될 필요가 있는 것으로 나타났다. 또한, 자유무역지역으로 인천신항이 지정될 때 경제적 파급효과를 산정한 결과 전국의 총 생산유발효과는 8,220억 원, 부가가치유발효과는 2,920억 원, 수입유발효과는 1,492억 원, 취업유발효과는 5,681명으로 분석되었다. 인천남항이 자유무역지역으로 지정될 경우 경제적 파급효과의 경우 생산유발효과는 4,038억 원, 부가가치유발효과는 1,434억 원, 수입유발효과는 743억 원, 취업유발효과는 2,791명으로 분석되었다. The purpose of this study is to respond to changes in the global logistics environment and foster a competitive free trade zone in Incheon Container Port by examining the feasibility of additional designation of free trade zones to secure competitiveness of Incheon Container Port. As a result of deriving an additional designated free trade zone for the Incheon hinterland logistics complex, Incheon New Port Phase 1-1 Zone 1, Zone 3, Phase 1-2 and Incheon Nam Port, Aam Logistics Complex 2 Phase 1-1 Zone 1 need to be additionally designated as free trade zones. In addition, as a result of calculating the economic ripple effect if Incheon New Port is designated as a free trade zone, the total national production inducement effect is 822 billion won, the national total value-added effect is 229 billion won. In case of Incheon South Port, total production inducement effect is 403.8 billion won, total value-added effect in the country is 143.4 billion won,

환율, 금리, 주가사이의 동적연관성 연구

홍정효(Chung-Hyo Hong),조혜원(Hae-Won Cho) 전북대학교 산업경제연구소 2010 아태경상저널 Vol.2 No.1

본 연구는 2000년 1월부터 2008년 말까지 콜금리, 3년물 국채금리, 원달러 외환시장 및 KOSPI자료를 이용하여 원달러 환율 및 장단기 금리 변화량, KOSPI수익률사이의 동적연관성을 실증적으로 분석하였다. 실증분석결과 첫째, 콜금리와 원달러 외환시장사이에는 장기적인 균형관계가 존재하고 있으나, 콜금리와 KOSPI, 원달러와 KOSPI사이에는 장기적인 균형관계가 존재하지 않는 것으로 나타났다. 3년물 국채금리는 콜금리와 공적분관계가 있으나 원달러, KOSPI와는 공적분관계가 존재하지 않는 것으로 나타났다. 둘째, 3년물 국채금리는 KOSPI 및 원달러 환율간에는 피드백적인 관계가 존재하고 있으나, 3년물 국채금리의 KOSPI 및 원달러에 대한 영향력이 그 반대의 경우보다 상대적으로 더 강한 것으로 나타났다. 세째, KOSPI와 원달러 환율사이에도 피드백적인 영향력이 존재하고 있으나 KOSPI의 원달러 환율변화에 대한 영향력이 그 반대의 경우 보다 더 강한 것으로 나타났다. 다섯째, 콜금리는 원달러 외환시장에만 영향력을 미치고 있으며, 장단기 금리사이에는 3년물 국채금리가 콜금리에 대한 영향력을 미치고 있으나 그 반대의 경우는 존재하지 않는 것으로 나타났다. 여섯째, 전반적으로 4가지 금융시계열모두 호재보다는 악재에 더 민감하게 반응하는 정보의 비대칭적인 특성이 존재하는 것으로 나타났다. 이러한 실증분석결과는 투자자들의 투자 및 위험관리전략 수립 뿐 아니라 정책당국자들의 통화 및 금융정책수립에 다소 나마 기여를 할 수 있을 것으로 보여 진다. We try to examine on the short term lead-lag relationship between call, KOSPI and won dollar spot markets with a vector error correction model, Granger causality test and impulse response analysis. This paper uses daily return data covering from January 2000 to December 2008. The major results are as follows; First, according to empirical test based on the Granger causality, the returns of won/dollar spot market Granger causes call market but vice versa. Second, we find a bilateral influence between won/dollar and KOSPI spot markets but the impact of KOSPI is relatively more dominant than of that of won/dollar market. Third, we also find that there is no influence between call and KOSPI markets in a statistically significant level. We hope these kinds of empirical results might be helpful for the investors to set up a asset portfolio and risk management system.

大麥의 交配集團에 대한 雜種强勢와 相關關係

鄭元福,李在順,黃弼聖 東亞大學校 大學院 2000 大學院論文集 Vol.25 No.-

This study was carried out to estimate the genetic parameters such as heterosis, heritabilities and genetic correlation in F1 hybrid by the cross combinations of five six-rowed hulled barley: Daejinbori, Gangbori, Tabgolbori, Oweolbori, Albori and three six-rowed naked barley: Songhakbori, Nlssalbori, Hinssalbori and five two-rowed malting barley: Sachun #6, Samdobori, Dusan # 29, Jingkwangbori, Dusan #8. The results obtained were as follows. Oweolbori×Tabgolbori in cross combination of hulled barley showed positive heterosis or heterobeltiosis in leaf length, leaf width, number of grains per spike, and 1,000 grain weight. Songhakbori×Nlssalbori in cross combination of naked barley showed generally positive heterosis and hetrobeltiosis in culm length, leaf width, seed length, seed width, number of grains per spike, and 1,000 grain weight. Oweolbori×Songhakbori in hulled barley×naked barley cross combination showed approximately positive heterosis or hetrobeltiosis in culm length, spike length, leaf length, awn length, seed length, and 1,000 grain weight. Songhakbori×Oweolbori in naked barley×hulled barley cross combination showed generally positive heterosis or hetrobeltiosis in culm length, seed length, and 1,000 grain weight. In Jingkwangbori×Oweolbori and Sachun #6×Songhakbori cross combination heterosis and hetrobeltiosis were high in 1,000 grain weight respectively. When Oweolbori of hulled harley and Songhakbori of naked barley participated in cross combination, heterosis or hetrobeltiosis in productivity was high. Hulled trait in six-rowed barley was dominant against naked trait. Two-rowed trait in malting barley was dominant against six-rowed trait. Heritabilities of cross combination were low for seed length but high for culm length, spike length, length of leaf, leaf width, awn length, 1000 grains weight, and number of grains per spike from 79.21% to 99.87%. Genetic correlation was highly positive in 1,000 grain weight and culm length, 1,000 grain weight and leaf width, 1,000 grain weigh and awn length.

Soft Switching 방식을 이용한 Active Clamp Mode Forward Converter 설계

원충연,유동욱,김덕헌,김학성 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.2

In recent years, a trend of DC-DC converter is studied mainly quasi resonant converter and multi resonant converter such as resonant type. But by using zero voltage and zero current method, these converter have voltage and current stress in the circuits. So the purpose of this paper is to reduce voltage and current stress, and to increase efficiency (about 5∼10%) rather than above converters. Experimental results show that active clamp mode PWM switching forward converter has minimum switching loss and conducting loss. The test results verify the simulation performance.

가변신호를 이용한 신호시스템 설계에 관한 연구

원충상 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-

This study investigates the most efficient way of managing traffic signal system by installing 2 sensors on both lanes of each direction. In order to achieve efficiency of traffic, these sensors are devised to sense flows of traffic on each lane. If the sensor on one side of the lane. senses no traffic, it deems that there is no traffic in waiting, and it skips green light and proceeds to the next direction. If only front sensor senses traffic, it gives short signal, and if both sides of sensor sense traffic, it is devised to give long signal, in order to maximise the efficiency of traffic flow. In this study, a multi-signal generating circuit and a variable clock signal switching circuit were designed for simulations, and result from the simulation was found satisfactory

미생물을 이용한 염료의 생분해에 관한 연구 : 반응성염료 분해균에 관한 연구 Studies on the Reactive Dye-Degrading Microorganisms

정영건,지원대,정민선,백형진 효성여자대학교 부설 한국환경위생연구소 1994 환경위생연구 Vol.4 No.1

대구시의 염색폐수처리장 폐수 및 처리장 주변의 토양과 물에서 반응성 염료인 Cibacron Brilliant Red 3B-A(CBR), Reactive Orange 16(RO), Reactive Black 5(RB)에 탈색능을 보이는 12종의 균을 분리하고 이들 균 중에서 본 실험에 사용한 CBR, RO, RB5 염료 모두에 약 90% 이상의 높은 탈색율을 나타낸 CBR2균을 선별하였다. 선별된 CBR2균의 특성 및 염료분해특성을 조사하였다. CBR2균은 그람 음성, 무아포, 간균으로 운동성이 있으며, 염농도 5%, 온도 50℃에서도 생육이 가능하였다. CBR2균의 생육 및 염료의 탈색에 미치는 pH의 영향을 조사한 결과, pH 5.0에서 9.0까지 고른 균 성장과 탈색율을 나타내었으며 특히 pH 7.0에서 최고의 균 성장 및 염료 탈색율을 나타내었다. 온도별 균의 생육 및 염료의 탈색율을 조사한 결과 30℃에서 가장 높은 균 성장 및 탈색율을 나타내었다. 산소량에 따른 균의 생육 및 염료의 탈색율을 조사한 결과, 산소량이 많을수록 균의 생육이 좋았으며, 염료의 탈색율에 있어서도 CBR 염료의 경우는 산소량에 비례해서 탈색율이 좋았으나, RO와 RB5 염료의 경우는 산소량이 가장 많은 2ml양의 배양에서 보다 상대적으로 산소량이 적은 4ml양의 배양에서 가장 높은 탈색율을 보였다. Twelve strains, which were exhibited abilities of decolorizationto the reactive dyes, Cibacron Brilliant Red 3B-A(CBR) , Reactive Orange 16(RO) and Reactive Black 5(RB5) , were isolated from the samples of waste waterof the dye textile factories and the samples of soil and water around them. Amongthem one stain, CBR2 was selected because of the higest decolorization rateto the reactive dyes, CBR, RO and RB5 with more than 90% of decolorizationrate. The characteristics of reactive dye-degrading microorganism CBR2 andits decolorization abilities to reactive dyes were investigated. This CBR2 wasGram negative and non-spore forming rod. This organism has motility and ispossible to grow even in 5% of sodium chloride solution and at such temperatueof 50℃ In the pH 5.0 to 9.0, growth rate of the isolate and decolorizationrate to reactive dyes by CBR2 were exhibited almost similar rates. However,among those pH of media the most growth and decolorization rates were appearedat pH 7.0. On the temperature effects to growth rates of CBR2 and decolorizationrate by this organism, the most growth and decolorization rates were at tempera-ture of 30℃. More oxygen volumes in test tubes enhanced generally the growthrate of this organism. However, the decolorization rate of CBR dye by CBR2was higher according to oxygen volume increased in the media but the decoloriza-tion rates of RO and RB5 dyes in 2m1 volume of culture media were rather decrea-sed than that of 4ml volume of culture media where oxygen volume is lowerthan that of 2ml volum of culture media.

한국의 광물명칭에 관한 연구

정원우,상기남,이윤종,김중욱,곽기근 慶北大學校 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.-

The purpose of this study is to investigate historical records on Korean mineral terms. One of the earliest records on Korean mineral terms is the Donguebogam(oriental medical handbook) written by Heo Jun in 1613. Most of geological investigation of Korea was accomplished by Japanese geologists in the period of the 1900~1945. Korean mineralogical records have been described by Gottsch(1886), Kwasaki(1935), Kinosaki(1937, 1940), Tsuda(1941, 1952) and Galleger(1963). Korean mineral species have been described about 300 species by KIER(Korea Institute Energy and Resources) in 1977. In the results of this study, Comparisons and classifications between current korean mineral terms and korean traditional and chinese medical mineral terms are suggested.

유한 저크(Finite Jerk)를 이용한 수직 MC(machining center)의 가속도 최적화에 대한 연구

정원지,조영덕,이춘만,윤상환 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

By the reason of increased demand of high productivity and quality, the manufacturer have an effort in many directions of a machine tool industries. Among there, we proposed method of decreasing displacement in MC(machining center). In other words, Quality related with vibration of a tool cutting products. For decreasing it, improved by optimizing a shape of the column-part and acceleration curves of motors In this paper we could find design factors has much influence on decreasing the displacement using the DOE(Design of Experiments) and optimized the level of the factors using ADAMS^(R) and MINITAB^(R). And we suggest optimized a acceleration curve using Matlab^(R).

치아미백제가 치과용 심미수복재의 색상에 미치는 영향

정석민,김원재,박영준 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1

The purpose of this study was to evaluate the effects of commercial home tooth bleaching agent application on the color of esthetic restorative materials. In order to evaluate the effect of intraoral aging of these materials(3 composite resins; Palfique Estelite??, Prodigy??, TPH Spectrum??, and 1 compomer ; Dyract??) on the degree of lightness change induced by tooth bleaching agents, each material groups were subdivided (thermocycled and non-thermocycled). Three specimens from each material group were treated with 5 types of bleaching agents (Nite White Excel??, Insta-Brite??, Opalescence??, Plus White?? and StarBrite Contrast_EM??) and evaluated. The results were as follows: 1. Bleaching agent treatments applied to esthetic restorative materials which were not thermocycled before the treatment induced various ΔL^* values as low as lesser than 1 and as high as greater than 4. On the other hand, the second material group (thermocycled before bleaching agent treatments) induced ΔL^* values lesser than 2, except in the case of Insta-Brite treated Dyract group. 2. In the grups that were thermocycled before bleaching agent treatment, Prodigy showed the lowest increase in L^* by all the bleaching agent treatments. Conversely, Dyract demonstrated a higher increase in L^* than the other esthetic restorative materials by Insta-Brite, Opalescence, Plus White bleaching agent treatments. 3. In the groups that were not thermocycled before bleaching agent treatment, Prodigy showed a lower increase in L^* when treated with Nite White Excel, Insta-Brite, Opalescence. On the other hand, TPH Spectrum displayed a higher increase in L^* except when treated with Plus White. These results demonstrated that all commercial tooth bleaching agents have appreciable bleaching effect on teeth, and induces color changes on restorative materials to varying degrees depending on the combination of restorative material and the tooth bleaching agents. More caution should be taken concerning these effects in the case of recently restored esthetic materials.