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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.
A Study on Ocular and Skin Irritation of a New Disinfectant, Clean Natural<SUP>®</SUP>
Suk Kim,Myung Sun Chun,Hee Sik Chung,Won Chul Jung,Dong Hyeok Kim,Jeong Ju Lim,Ho Yeong Shon,Gon Sup Kim,Hu-Jang Lee 한국실험동물학회 2007 Laboratory Animal Research Vol.23 No.1
This test was performed to evaluate the ocular and skin irritation of Clean Natural<SUP>®</SUP>", a new disinfectant of which main components are propolis and wood vinegar from Quercus mongolica. The results of eye irritation test were as followings; in the single application test, 0.1 ㎖ Clean Natural<SUP>®</SUP>" eyedrops and 0.9% saline as vehicle control were applied to one eye of rabbit, respectively. The reactions were examined for 7 days after treatment. Transient, Up to 2 days, eye irritation was observed in the rabbit eyes treated with the test solution. The results of skin irritation test were as following; there were no observed clinical signs, body weight changes and gross pathologic findings during experimental period. There were no observed erythema, eschar, and edema formation on intact and abraded skin. The primary irritation index (P.LL) of Clean Natural<SUP>®</SUP>" was 0 and was evaluated none irritating product. In the present study, 10% Clean Natural<SUP>®</SUP>" was evaluated as minimally irritating and none-irritating product for eye and skin, respectively.
Eun Mee Oh<SUP>1<,SUP>,Yoo Seung Chung<SUP>1<,SUP>,Won Jong Song<SUP>1<,SUP>,Yeun Sun Kim<SUP>2<,SUP>,Young Don Lee<SUP>1<,SUP> 대한갑상선-내분비외과학회 2013 The Koreran journal of Endocrine Surgery Vol.13 No.3
Purpose: Neck ultrasonography (NUS) is one of the most commonly used methods for evaluating thyroid nodules and preoperative higher TSH levels are known to be associated with differentiated thyroid cancers. This study was conducted to assess whether serum TSH levels and neck ultrasonography are of value in predicting malignancy in patients with atypia of undetermined significance/follicular lesions of undetermined significance (AUS). Methods: A total of 62 patients (7 men, 55 women; mean age 48.4±11.9 years) who had indeterminate cytologic results indicating AUS underwent thyroidectomy. Preoperative clinical data including serum TSH and the findings of NUS were analyzed retrospectively between malignant and non-malignant groups. Results: The final pathologic results of malignancy were reported in 53 of 62 (85.5%) patients with AUS. There was no significant difference in the mean value of preoperative serum TSH between malignant and non-malignant groups (1.5±1.3 vs. 1.9±1.2, P=NS). In NUS, the patients diagnosed with malignancy in histology showed a higher proportion of calcification, taller-than-wide shape, hypoechoic texture and irregular margin (58.5% vs. 22.2%, P=0.044; 34% vs. 0%, P=0.038; 98.1% vs. 44.4%, P<0.01; 47.2% vs. 0%, P= 0.008). Conclusion: Serum TSH was not related to malignancy in thyroid nodules showing AUS. However, ultrasonographic features including calcifications, taller-than-wide shape, hypoechoic pattern and irregular margin could be used to predict malignancy. Ultra-sonography should be the first useful methods when making decisions regarding mana-gement of thyroid nodules showing indeterminate cytologic results as AUS.
Won-sup Chung 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.1
A gain-adjustable class AB bipolar linear transconductor using unity?gain buffers is proposed. It consists of a voltage follower, a resistor, and a gain-adjustable current amplifier. SPICE simulations using an 8 GHz bipolar transistor-array parameter show that the linear transconductor with a transconductance of 1 mS exhibits a linearity error of less than ±0.75 % over an input voltage range of ±0.8 V for a supply voltage of ±2.0 V. The temperature coefficient of the transconductance is less than ?47 ppm/℃. The ?3 dB frequency of the transconductance is more than 4.6 GHz. The proposed linear transconductor is applied to a current?tunable LC?tuned oscillator, thereby validating its applicability.
A Resistance Deviation-to-Time Interval Converter Based on Dual-Slope Integration
Chung, Won Sup,Choi, Gi Joo,Choi, Dong Han 청주대학교 산업과학연구소 1990 産業科學硏究 Vol.8 No.-
저항형 센서를 디지탈 시스템에 접속시키기 위한 저항변화-시간간격 변환기를 이중적분에 기초를 두어 개발했다. 이 변환기는 센서의 저항변화를 시간간격으로 선형적으로 변화시켜주며 높은 분해능을 제공한다. 회로의 동작원리 및 실험결과를 제시한다.
A Triangular/Square Waveforms Generator Using Linear OTA's
Chung, Won Sup,Park, Ji Mann 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
전류로 주파수를 제어할 수 있는 삼각파/구형파 발생기를 제안하였다. 이 발생기는 스위칭 소자들로써 연산 트랜스컨덕턴스 증폭기를 이용하였다. 이 회로를 일반 상업적으로 이용할 수 있는 소자들로 구성하였을 경우, 주파수에 대한 전류가 좋은 선형성을 보였으며, 상대적으로 낮은 온도 감도를 가졌다. A triangular/square waveforms generator with current controllable frequency is described. The genertor utlizes operational transconductance amplifiers as switching elements. The circuit built with commercially available components exhibits good linearity of current to frequency and relativelv low temperature sensitivity.
Case Reports : A Case of Septic Azygos Vein Embolism Caused by Staphylococcus aureus Bacteremia
( Won Sik Kang ),( Joo Won Min ),( Sang Joon Park ),( Min Kyung Lee ),( Chan Sup Park ),( Jae Ho Chung ) 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.3
A Septic embolism is a type of embolism infected with bacteria containing pus. These may become dangerous if dislodged from their original location. Embolisms of this type in the azygos vein are potentially fatal. The diagnosis of septic azygos vein embolism is difficult, so rapid diagnosis and treatment is important to avoid complications. Generally, treatment is enough for appropriate antibiotic therapy without anticoagulant therapy. We report a case of staphylococcal septic embolism in the azygos vein, which was discovered in a 51-year-old man exhibiting chest pain, dyspnea and fever. The patient was treated with antibiotic therapy alone without the use of anticoagulants.
Active-RC circuit synthesis for the simulation of a current-controlled inductor
Chung, Won Sup 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.15 No.3
OTA(operational transconductance amplifier)를 이용한 전류-제어 인덕터를 설계하기 위한 체계적인 합성 과정을 제안했다. 제안한 합성 과정을 통해 세 개의 회로가 얻어졌다. 그 중의 두 회로는 처음 보고되는 새로운 회로이다.