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.

새로운 리플 아나로그 : 디지틀 변환기

정원섭(Won-sup Chung) 대한전기학회 1988 대한전기학회 학술대회 논문집 Vol.1988 No.7

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

Stator Current Processing –Based Technique for Bearing Damage Detection in Induction Motors

Won ?Pyo Hong,Chung-Sup Yoon,Dong-Hwa Kim 제어로봇시스템학회 2005 제어로봇시스템학회 국제학술대회 논문집 Vol.2005 No.6

용량형 센서용 스위치드-커패시터 인터페이스 설계

정원섭,차형우 청주대학교 산업과학연구소 1988 産業科學硏究 Vol.6 No.-

A novel switched - capacitor circuit for interfacing capacitive microtransducers with a digital system has been developed based on dual - slope integration. It consists of a differential integrator and a comparator. The circuit senses the capacitance difference between the transducer and the reference capacitor, accumulating the sensed charge into the feedback capacitor of the integrator for a fixed period of time. The known reference charge is then extracted from the accumulated charge untill the integrator output voltage returns to zero. The whole operation is insensitive to the reference voltage and the capacitor values involved in the circuit. Thus the proposed circuit permits an accurate differential capacitance measurement. Besides the accuracy, it features the small device count integrable onto a small chip area. The circuit is thus particularly suitable for the on- chip interface.

Interleukin-2가 Mouse간의 인산염분해효소의 활성에 미치는 영향

이규식,김원규,정호삼,강성섭 한양대학교 의과대학 1989 한양의대 학술지 Vol.9 No.1

In recent years, interleukin-2, a lymphokine produced by antigen or mitogenstimulated lymphocytes, has been intensively with the development of immunooncology and chemoimmunotherapy of the malignant tumor. Interleukin-2 mediates antitumor effect by stimulating the proliferation of helperand cytotoxic T cells, augmenting the cytolytic activities of cytotoxic T-lymphocytes and differentiating T-lymphocytes into a lymphokine-activated killer cell in vivo. Thus interleukin-2 induces the therapeutic effects on various sarcoma and carcinoma and regresses the pulmonary, hepatic and peritoneal metastases of various tumors. Although interleukin-2 is very effective for the treatment of various malignancy, it develops many side effects including fever, chill, malaise, mental confusion, diarrhea, vomiting and oliguria and causes pulmonary, hepatic and renal toxicities. Especially interleukin-2 results in increase of capillary permeability with weight gain, pulmonary edema, and ascites. In this experiment, the author studied the effect of interleukin-2 on the mouse liver, histochemically observing the changes in the activities of alkaline phosphatase, acid phosphatase and adenosine triphosphatase. Male mice, DDY strain, weighing 20gm, were used as experimental animals. The experimental animals were sacrificed at 3, 6, 12, 24 and 48 hours after intraperitoneal administration of two milions unit of interleukin-2 per kilogram of body weight. The specimens obtained from the liver were fixed in 10% neutral buffered formalin solution for 24 hours at 4℃ and sliced at 16㎛ thickness in a frozen cryostat. The activities of alkaline phosphatase and acid phosphatase were observed by the Gomori's method and the activity of adenosine triphosphatase was observed by the Wachstein and Meisel's method for histochemical study. The results obtained were as follows. 1. The acid phosphatase activity was strong positive at 12 hours and 24 hours groups in the central and portal zones of the liver lobules, but weak positive and moderate positive at 48 hours group in the central and portal zones of the liver lobules, respectively. 2. The alkaline phosphatase activity was weak positive at 6 hours and 12 hours groups and moderate positive at 48 hours group in the central and portal zone of the liver lobules. 3. The adenosine triphosphatase activity was trace positive in the central zone and weak positive in the portal zone of the liver lobules at 6 hours group but moderate positive at 48 hours group in the central and portal zones of the liver lobules. Consequently, it is suggested that interleukin-2 induce degenerative changes of the hepatocytes of the mouse, but it is recovered with time.

저항형 습도 센서를 위한 전류-모드 인터페이스 회로 설계

정원섭,임동빈 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1

A current-mode interface circuit has been designed for interfacing resistive humidity sensors with digital systems It accomplishes the linearization and temperature compensation of sensor characteristics The theory of operation is presented and experimental results are used to verify theoretical predictions.

OTA를 이용한 전류-제어 톱니파 발생기

정원섭 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1

A saw-tooth waveform generator with current-controllable frequency is described. The generator utilizes operational transconductance amplifiers as switching element. It features simple and wide sweep capability. The circuit built with commercially avaliable components exhibits good linearity of current to frequency and relatively low temperature sensitivity.

용량형 센서를 위한 용량차-시간차 변환기

정원섭,박지만 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2

A novel capacitance deviation-to-time interval converter based on ramp-integration is presented. It consists of two current mirrors, two schmitt triggers, and control digital circuits by the upper and lower sides, symmetrically. Total interface circuit has been with discrete components. The results have shown that the cacpacitance deviation has linearily time interval(pulse width). Therefore, the high-resolution can be known by counting the fast and stable clock pulses gated into a counter for time interval. The presented circuit is insensitive to the capacitance difference in disregard of voltage source or temperature deviation. Besides the accuracy, it features the small MOS IC device count integrable onto a small chip area. The circuit is thus particularly suitable for the on-chip, interface.

回轉圓板에 依한 窒酸化에 關한 硏究

諸元穆,鄭渭得,金冕燮 漢陽大學校 環境科學硏究所 1989 環境科學論文集 Vol.10 No.-

回轉圓板을 利用하여 COD除去와 室酸化를 同時에 效率的으로 達成하기 위하여 일련의 實驗을 行하였다. 回轉圓板에서 박리시킨 Sludge를 현탁 狀態에서 利用하여 室酸化에 미치는 pH의 影響을 檢討하였으며, 最適 pH값은 7.5∼8.5이었다. 많은 量의 酸素供給에 依해서도 室酸化는 增加되지 않았으며, 그 까닭은 놓은 COD負荷條件下에서 COD를 利用하는 微生物君에 依해 두꺼워진 生物膜이 室酸化에 必要한 酸素와 基質移動을 制限한 때문인 것으로 推定되었다. 回轉圓板을 利用한 室酸化를 爲해서는 COD負荷는 0.027㎎/㎝²·hr以下로 制限되어야 하고, 또 높은 COD와 無機室素를 合有하는 廢水의 處理에는 多段 System이 適用되어야 한다는 것을 알 수 있었다. Rotating biological disc contactor system was used in order to accomplish the COD removal and nitrification simultaneously in one step. The effect of pH on nitrification rate was examined in a suspended growth system, using microorganism scraped from the rotating discs, and an optimum pH value was between 7.5 and 8.5. Nitrification was not accompanied by a large amount of dissolved oxygen supplied in the system. This might be attributed to the inreased thickness of the COD-utilizer-biofilm limited oxygen and substrate transfer for nitrification under high COD loading. It was found that the COD loading must be reduced to below 0.027㎎/㎝²·hr, for nitrification to occur in the rotating disc system, and that a multi-stage system could improve the treatment of waste water containing both high COD and inorganic nitrogen.