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김동섭,Kim, Dongsub 대한소아감염학회 2020 Pediatric Infection and Vaccine Vol.27 No.2
Purpose: Group A streptococcus (GAS) is a common pathogen in pediatric patients and often causes acute pharyngotonsillitis and skin and soft tissue infections. In addition, bacteremia with significant morbidity and mortality can also occur. This study was conducted to describe the clinical manifestations and treatment outcomes of pediatric GAS bacteremia patients in Korea. Methods: This was a single-center, retrospective study. From January 2000 to December 2016, pediatric patients aged ≤18 years with GAS bacteremia were studied. Clinical manifestations, underlying diseases, intensive care unit stay, and antibiotic susceptibility were evaluated. Results: During the study period, 19 patients had GAS bacteremia. Ten (53%) were male, and the median age was 7.4 years (range, 0.3-17.4 years). Fourteen (74%) had chronic underlying diseases. Five (26%) were immunocompromised (leukemia and chronic kidney disease). Eight (42%) had lymphatic or vascular malformations, of which seven had lesions with signs of inflammation. Three (16%) developed pneumonia, and two of them received ventilator care. The 30-day mortality rate was 6% (1/19), and the cause of death was bacteremic pneumonia. All GAS isolates were sensitive to penicillin. Fifteen (79%) were sensitive to both erythromycin and clindamycin. Conclusions: This study identified various clinical manifestations of GAS bacteremia. GAS should be considered as a potential pathogen that can cause bacteremia and result in a serious clinical course.
한국인의 Epstein-Barr Virus 항체 양성률 변화양상에 대한 분석: 단일기관 연구
김수경,최준식,김동섭,강철인,정두련,백경란,강은숙,김예진,Kim, Su Kyung,Choi, Joon-Sik,Kim, Dongsub,Kang, Cheol-In,Chung, Doo Ryeon,Peck, Kyong Ran,Kang, Eun-Suk,Kim, Yae-Jean 대한소아감염학회 2020 Pediatric Infection and Vaccine Vol.27 No.2
Purpose: Epstein-Barr virus (EBV) infection is related to infectious mononucleosis or nasopharyngeal cancer, and its epidemiology may change according to the socioeconomic development of communities. This study aimed to evaluate the recent epidemiology of EBV seropositive rate in Korea. Methods: We retrospectively reviewed EBV serology test results obtained from a part of clinical care at Samsung Medical Center, Seoul, South Korea, from January 2000 to December 2017. Results: The EBV seropositive rate in 26,527 subjects during the study period was 81.0% (21,485/26,527): 44.4% (2,716/6,122) in subjects aged 0-9 years, 75.8% (2,077/2,739) in those aged 10-19 years, and 94.5% (16,692/17,666) in those aged ≥20 years. The EBV seropositive rate decreased from 89.4% (8,592/9,616) in 2000-2008 to 76.2% (12,893/16,911) in 2009-2017 (P<0.001). Especially, the EBV seropositive rate in subjects aged 0-19 years significantly decreased from 2000-2008 to 2009-2017 (0-9 years, 62.8% [1,172/1,866] in 2000-2008 and 36.3% [1,544/4,256] in 2009-2017; 10-19 years, 83.8% [745/858] in 2000-2008 and 70.8% (1,332/1,881) in 2009-2017) (P<0.001). Conclusions: The EBV seropositive rate in children has decreased in the last 20 years. As the age of patients with primary EBV infection increased, there is a need for interest in clinical manifestation, such as infectious mononucleosis, in adolescents and young adults.
현장센서를 활용한 태양광 단기 발전량 예측의 매개변수 추정 기법
전기량(Gi-Ryang Jeon),방철환(Chulhwan Bang),김동섭(Dongsub Kim) 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.11
본 논문은 태양광 발전설비 측에 임시로 설치한 센서를 통하여 단기 발전량 예측에 핵심적으로 작용하는 매개변수를 추정하는 방법을 제안한다. 제안하는 방법은 현장에서 경사일사량, 모듈온도 등의 추가적인 정보를 취득하여, 일사량 예보로부터 태양광 발전의 물리적인 상호작용을 반영하는 2차변수를 추정하고 이를 발전량 예측에 활용한다. 실험 결과 일사예보와 발전실적만을 이용하는 기존의 방법보다 예측정확도가 개선된 것을 검증하였으며, 학습된 가중치로부터 발전효율까지 효과적으로 추정할 수 있었다.
최강운(Kang-Un Choi),박병석(Byeongseok Park),김동섭(Dongsub Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.11
AMI is a large-scale IoT system that provides various customer services such as demand response and load analysis service by collecting and analyzing customers" electricity consumption in semi-real time using bidirectional communication. Since the existing AMI system used a non-standard private protocol, standardization of the data model and transmission method is required. In this paper, the data model and transmission method based on the LwM2M IoT protocol were designed to be suitable for the AMI system. In addition, a prototype was developed and the performance and stability were tested in the field. As a result of the field test, it was confirmed that the timely data collection rate of more that 99% was achieved, and the collection time of AMI information was greatly reduced by more that 95% compared to the existing one. Therefore, it is considered that it can be used for future distribution system prediction and demand management service.
서비스 확장이 용이한 AMI Gateway 플랫폼 기술 개발
서동완(Dongwan Seo),박병석(Byeongseog Park),김용배(Yongbae Kim),김동섭(DongSub Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
AMI 시스템은 전력 사용 고객에 설치된 전력량계로부터 준실시간으로 검침정보를 수집하는 대규모의 IoT 시스템이다. 최근 분산전원의 확대공급에 따라 AMI 시스템은 시간 연동 요금제, 고객 모니터링 서비스, 분산전원 감시제어 등 다양한 연계서비스를 수용할 수 있도록 진화를 요구받고 있으며, IoT 기술을 적극 수용한 SMGW(Smart Meter Gateway)를 기반으로 발전하고 있다. 본 논문에서는 기존의 검침뿐만 아니라 다양한 서비스를 효과적으로 탑재하고 운영하기 위해 개발된 SMGW 플랫폼 구조 및 시험 결과에 대하여 소개한다.
조종민(Jongmin Jo),이우종(Wujong Lee),이일용(Ilyong Lee),맹창엽(Changyeop Maeng),김동섭(Dongsub Kim),조성수(Seongsoo Cho) 대한전기학회 2021 전기학회논문지 Vol.70 No.3
This paper studies and proposes some algorithm for voltage regulation of distributed energy resource in distribution system from a electric power corporate point of view. In a recent situation, as the level of connection of distributed energy resource to the distribution system increases, the voltage excess problem is frequently occurring. Therefore, electric power corporate need a way to solve the voltage excess problem. In this paper, KEPCO propose a voltage regulation control algorithm for the photovoltaic inverter that can improve the renewable capacity of the low-voltage system. This paper examines a method to improve the capacity of renewable energy of the power system, where it increases the power generation utilization rate of renewable power owners comparing and evaluating the voltage regulation effect of the extra-high-voltage and low-voltage systems by controlling the reactive power of the solar inverter. In particular, a voltage regulation control algorithm of the solar inverter was proposed in order to improve the voltage control effect of the low voltage system, and the effect was evaluated and analyzed in the low voltage system model.