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IoT 어플리케이션에서 활용하는 참조 전압을 같이 생성할 수 있는 표준 편차가 낮은 온도 센서
오주원,부영건,정연재,이강윤,Juwon Oh,Younggun Pu,Yeonjae Jung,Kangyoon Lee 반도체공학회 2024 반도체공학회 논문지 Vol.2 No.2
본 논문은 BJT 소자의 온도 특성에 의해 생성되는 전류를 활용하여 ADC 와 함께 센서의 정보를 변환하는 과정에서 필요한 참조 전압(Reference Voltage)과 온도센서 전압을 하나의 증폭기에서 생성하고자 하는 목적에 따라 설계하는 회로를 제안한다. 이와 함께 회로의 표준 편차를 줄이기 위한 두개의 컨트롤 방식이 추가되어 10 배 이상의 표준 편차를 감소시키는 결과를 얻게 된다. 제안하는 회로의 면적은 0.057mm<sup>2</sup> 이며 55nm RF 공정을 활용하였다. This paper presents a circuit design aimed at generating the required reference voltage and temperature sensor voltage in conjunction with an ADC, utilizing the current generated by temperature characteristics of BJT components for sensor data conversion. Additionally, two control methods are introduced to reduce the standard deviation of the circuit, resulting in over a ten-fold decrease in standard deviation. The proposed circuit occupies an area of 0.057mm<sup>2</sup> and was implemented using 55nm RF process.
광주지역 하수슬러지 중 PAHs 함량 조사 및 유해성 평가
서동주 ( Dongju Seo ),이우진 ( Woojin Lee ),서희정 ( Heejeong Seo ),박지영 ( Jiyoung Park ),박주현 ( Juhyun Park ),정연재 ( Yeonjae Jeong ),전홍대 ( Hongdae Jeon ),서광엽 ( Gwangyeob Seo ),정재운 ( Jaewoon Jung ),김난희 ( Nanhee K 한국폐기물자원순환학회 2024 한국폐기물자원순환학회지 Vol.41 No.3
In this study, the content of polycyclic aromatic hydrocarbons (PAHs) contained in the sewage sludge generated in Gwangju was investigated. Additionally, the possibility of using the sewage sludge as a resource rather than a waste was confirmed through hazard assessment. The total PAH concentration ranged from 0.66 to 3.73 mg/kg dry weight (d.w.), with a mean concentration of 1.63 mg/ kg d.w. Total PAH concentrations varied significantly with seasonal rainfall and water usage, and the proportion of high molecular weight (HMW)-PAHs was relatively high when affected by wastewater discharged from industrial areas. The source of PAHs was estimated according to the proportion of individual isomers, and it was found that most PAHs were caused by burning fossil fuels or biomass. The PAH concentration in sewage sludge in Gwangju was less than 6 mg/kg, which is the threshold for use on farmland in developed countries, such as countries in Europe. Therefore, the sewage sludge can be used as a resource.