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.

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.

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,

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

최근 발병한 정신분열병 환자의 증상 관해 및 정신사회적 기능 : 1년 전향적 추적 관찰 연구

정석훈,박원명,권준수,박지홍,안준호,고진경,김창윤 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5

Objectives : The long-term outcome of schizophrenia is still considered vahable and inconclusive. We perfonned a one-year prospective observational study to investigate the longitudinal outcomes in patients with recent-onset schizophrenia. The primary purpose was to determine the descriptive outcomes in tenns of symptom remission and psychosocial function. The secondary purpose was to identify predictor variables associated with the outcomes. Methods : Patients experiencing their first episode ofpsychosis or hospitalization within the past 2 years with a diagnosis of DSM-IV schizophrenia were included. Clinical symptoms were assessed monthly using Brief Psychiatric Rating Scale (BPRS), Scale for the Assessment of Positive Symptoms (SAPS), Scale for the Assessment of Negative Symptoms (SANS) and Clinical Global Impression (CGI) scale. Psychosocial function was measured using PSYCH-UP (Psychosocial symptoms you currently have, follow-up version) and Heinrichs' Quality of Life Scale (QLS) at baseline, 6, and 12 months and Global Assessment of Functioning (GAF) monthly. Remission was defined on the basis of overall, and psychotic core symptoms as having 1) BPRS total score ≤ 36, and 2) Each individual item score of core psychotic items (conceptual disorganization, suspiciousness, hal-lucinatory behavior, unusual thought content) ≤3, and 3) CGI severity score ≤3, and 4) Duration of remission at least for 2 consecutive months. To identify the predictive variables for the outcome, relationships between time to remission and various clinical variables were examined using Cox proportional hazards model. Results : A total of 49 patients with schizophrenia were enrolled in this study. The proportions of patients with symptom re-mission were 54.5% (24/44, drop outs=5) at 3 months, 55.3% (21/38, drop outs=11) at 6 months, and 64.3% (18/28, drop outs=21) at 12 months. Mean time to remission was 3.76±2.43 (s.d.) months, and the mean duration of remission was 7.54±2.99 months. Significantly longer time to remission was predicted by higher SANS total score at baseline in various predictor variables (p=0.01). Impairments of psychosocial function measured using PSYCH-UP and QOL were significantly improved at the end of this study, but still remained at mild to moderate level. SANS total score and GAF score significantly correlated with most ofthe items related to psychosocial fimction at 12 months. The proportion of the patients with GAF score ≥60 increased from 6.1% at baseline to 85.8% at 12 months. Of the patients who were in remission at 12 months, 95.5% obtained GAF score ≥60. Conclusion : This study showed 64.3% of symptom remission rate in patients with recent-onset schizophrenia. Symptom re-mission was accompanied by significant improvement ofglobal function. The severity of negative symptom at baseline appeared to be a significant predictor for time to remission. Psychosocial function was improved at the end of this study, but impainnents still remained at mild to moderate level. GAF score and negative symptoms significantly correlated with psychosocial function.

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).

상위수준 합성에서의 레지스터 할당에 관한 연구

元忠常 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2

In relation to the matter of register transfer unit allocation of high-level sysnthesis, register allocation was performed in the study by employing weighted bipartite matching method believed to be appropriate for the experiment after reviewing clique partitioning method, left-edge algorithm method, weighted bipartite matching.