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Controller Design with High Fidelity Model for a Passive Maglev Tray System
Park, Jin-Woo,Kim, Chang-Hyun,Park, Doh Young,Ahn, Changsun Korean Society for Precision Engineering 2014 International Journal of Precision Engineering and Vol.15 No.8
Usually, in controller design for maglev systems, only the dynamics of the magnet and the levitating object are modeled. However, reference frames, such as rails for maglev trains or magnet frames for a maglev tray system, are assumed as rigid bodies even though they have compliances. This is because the modeling of reference frames based on their design is not simple as the modeling of magnets or levitating objects. Therefore, the compliances of the reference frames are implicitly considered during the controller tuning process. Undoubtedly, controllers designed with better fidelity of system model will show better performance. This study presents an experimental way of achieving a model of a reference frame through impact tests and discusses the benefits of having a higher fidelity model in control design. The exemplary system is a passive maglev tray. Least Quadratic Regulator (LQR) control design is used to show the benefits of having a higher fidelity model. To verify the controllers in several conditions, the passive maglev tray system is designed and manufactured. Through several tests with several conditions, we will provide some suggestions for controller design of maglev systems.
Localization and persistence of hepatitis A virus in artificially contaminated oysters
Park, Hyunkyung,Jung, Soontag,Shin, Hansaem,Ha, Sang-Do,Park, Tae Jung,Park, Jong Pil,Seo, Dong Joo,Choi, Changsun Elsevier 2019 International journal of food microbiology Vol.299 No.-
<P><B>Abstract</B></P> <P>Bivalve molluscan shellfish, such as oysters, clams, and cockles, are well-recognized as vectors that concentrate foodborne pathogens by filter feeding. The objective of this study was to investigate the distribution and persistence of hepatitis A virus (HAV) in experimentally contaminated oysters that were either fed or not fed with algae. Oysters were experimentally contaminated with HAV and maintained in depuration conditions. qRT-PCR, immunohistochemistry (IHC), and <I>in situ</I> hybridization (ISH) were performed on oyster samples collected at 0, 1, 3, 5, and 7 days post-inoculation. When HAV-contaminated oysters were depurated for 7 days, HAV was detected in 91.1–97.8% of the digestive glands and gills. While the high viral load in the digestive glands in oysters did not change significantly regardless of algae-feeding, the viral load of the gills gradually decreased in both groups during the depuration. HAV antigen and RNA were detected in the digestive diverticula and connective tissues by both IHC and ISH. HAV was detected in the stomach, intestine, and gills by only ISH. The distribution of HAV in various oyster tissues may explain the persistence of contamination in oysters during the depuration process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High titer of HAV was accumulated in the digestive gland and gills of oysters. </LI> <LI> HAV capsid was localized in the hemocyte and digestive gland by immunohistochemistry. </LI> <LI> HAV RNA was visualized in the hemocytes and digestive gland by <I>in situ</I> hybridization. </LI> <LI> HAV was persistently detected in oysters for 7 days under depuration condition. </LI> </UL> </P>
Performance Potential of Regenerative Braking Energy Recovery of Autonomous Electric Vehicles
Yeayoung Park,Seokhyeon Park,Changsun Ahn 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
Regenerative braking is an important feature to increase the driving range of electric vehicles (EVs). For an autonomous EV, the deceleration profile and portion of regenerative braking torque can be control variables affecting the regenerative braking energy recovery. To design a control algorithm maximizing the energy recovery, knowledge of the maximum performance of the control system and the optimal control inputs for the maximum performance is very useful. This paper presents how to extract the maximum performance and corresponding optimal control variables for maximizing the energy recovery. As an exemplary application of the extracted optimal solutions, a simple braking strategy was designed and validated in a simulation environment. It outperformed the maximum generation torque strategy that is generally considered as the best strategy for maximizing energy recovery.
안창선 ( Changsun Ahn ),박용호 ( Yongho Park ),문정대 ( Jungdae Moon ),박종찬 ( Jongchan Park ),서영곤 ( Youngkon Seo ),손유락 ( Allen Sohn ),최윤종 ( Yoonjong Choi ),하양화 ( Yanghwa Ha ),정봉수 ( Bongsu Jung ),김영주 ( Youngjoo 한국정보처리학회 2023 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.12 No.2
뎅기열 발병은 전 세계 인구의 약 1/3이 거주하고 있는 열대, 아열대 기후에 집중되며, 우리나라도 아열대 기후로 바꾸고 있어 뎅기열 발병에 취약해지고 있다. 뎅기열은 감염병 관리 차원에서 진단 이력 관리가 중요하다. 감염병 이력에 따라서 지역별, 연령별, 남녀비율 등에 따라서 개개인의 치료 방법과 전략을 수립할 수 있는 체계가 필요하다. 본 논문에서는 뎅기열 관제시스템을 제안하며, 이러한 시스템은 뎅기열의 발병에 대한 체외진단기기를 이용한 실시간 집계방식으로 발병률과 사망률을 감소시킬 수 있는 전략을 수립하는 데 유용하게 활용될 수 있다. 뎅기열 관리를 위한 관제시스템 구성으로 형광면역진단 키트를 이용한 뎅기열 체외진단기기와 실시간 뎅기열 관제시스템으로 구성되어 있다. 본 논문으로 개발된 뎅기열 관제시스템은 향후 정부의 감염병 통합정보와 결합되어 다양한 감염병 관리 및 정책 활용을 위해서 활용될 수 있을 것이다. Dengue virus transmission is a viral infection disease between humans and Aedes mosquitoes. Dengue is ubiquitous throughout the tropics and subtropical zones, where 1/3 of the global population live. The weather in Korea is also changing to subtropical weather, resulting in increased vulnerable Korean population to dengue virus transmission. It is important to control and prevent the dengue risk with track-recording & monitoring system. It is also required to have the control system to treat and monitor dengue patients with various cases such as regions, ages, genders according to the track-record of the disease. In this paper, we developed a Dengue Control & Prevention System, which can monitor and control dengue outbreaks in real-time with in-vitro diagnostic devices. Dengue Control & Prevention System is composed of in-vitro diagnostic device, which is a fluorescent immunoassay, and real-time monitoring system. In the future, we expect that our Dengue Control & Prevention System can be upgraded to have various disease information from Korea Disease Control and Prevention Agency for government policies and diseases control in Korea.
탑승객 열 쾌적성 향상을 위한 외기 도입량 제어 공기 분배 장치 개발
박창선(Changsun Park),김주훈(Joohun Kim),이동원(Dongwon Lee),이대웅(Daewoong Lee),강양보(Yangbo Kang) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In this paper, the effects of outdoor air (ram air) flowing into interior through an air handing unit (AHU) was studied. The passengers felt thermal discomfort when vehicle was driving at high speed at winter due to cold ram air into cabin. The amount of ram air that varies depending on the driving speed of the vehicles is controlled to improve the thermal discomfort and cabin ventilation of the occupants, and to prevent fogging of the windshield. The air pressure to the AHU against each driving speed of the vehicle was measured, and the opening angle of the intake door at the AHU and the feedback voltage of the servo motor were measured. Ram air control is changed the intake door mechanism installed in the AHU’s blower to select the fresh air, and developed a control logic to control the amount of ram air into the occupants. As the results, current AHU increase the inflow of ram air by more than 60% when the vehicle runs at high speed, while the developed AHU controls the amount of ram air to about 10% regardless of the vehicle speed.
Greenhouse Management Framework based on Localization Using RGPSi and AoA
Jangwoo Park,Hong-geun Kim,Yongyun Cho,Changsun Shin,Kyungryong Cho,Dong-guk Park 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12
In this paper, the concept of the smart greenhouse control framework is proposed with the help of localization algorithm. The proposed smart greenhouse framework consists of the data aggregator with the database, the environment control part and the crop growth status control part. The data aggregator has been equipped with the various sensors to measure the data for crop growth. The sensors have ability of communication and calculation of location of target. As a localization algorithm, RGPSi is used. RGPSi uses the iteration algorithm similar to the GPS algorithm, but utilize the ratio of signal strengths instead of absolute strengths. To improve the accuracy of the localization, the method of AOA(angle of arrival) of signal will be added. The environment control part has the role to generate the control signals for the greenhouse to operate properly for satisfying the goal. Information for the status of crop growth is generated from the growth control part. With the help of the goal function two parts will be interacting each other and have fed back the sensed data from the greenhouse.
박창선(Changsun Park),차용훈(Yonghoon Cha),성백섭(Backsub Sung),이석신(Seokshin Lee),배광석(Kwangsuk Bae),최귀현(Kuy syun Choi),김정주(JungjJoo Kim),김남표(Nampyo Kim),박성호(Sungho Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Die casting which is extensively known as a necessary technology for lightweight spare parts of automobiles has three central elements of casting equipment, casting technology and die and has had much attention as a technology with the highest coefficient of expansion with increased need of high-quality and high-precision. Therefore, a regulator of LPI automobile receives high internal pressure and works as a central part of the basic fuel supply system according to quality of performance. To produce high-quality casting goods, we need to identify causes of defects and theoretical analyses on physical phenomena occurring in manufacturing. As a result of comparing Types of casting design, it was found that the number of overflow affected flow, flow speed and solidification temperature.
Pathogenesis of Human Norovirus Genogroup II Genotype 4 in Post- Weaning Gnotobiotic Pigs
( Byung-joo Park ),( Soon-tag Jung ),( Changsun Choi ),( Jinjong Myoung ),( Hee-seop Ahn ),( Sang-hoon Han ),( Yong-hyun Kim ),( Hyeon-jeong Go ),( Joong-bok Lee ),( Seung-yong Park ),( Chang-seon Son 한국미생물 · 생명공학회 2018 Journal of microbiology and biotechnology Vol.28 No.12
Norovirus is the most common cause of acute gastroenteritis. Its pathogenesis is poorly understood owing to the difficulty of establishing viral infection in animal models. Here, postweaning gnotobiotic pigs were infected with human norovirus genogroup II genotype 4 (HuNoV GII.4) to investigate the pathogenesis and replication of the virus. Three groups of four pigs were infected with 1 × 10<sup>5</sup>, 1 × 10<sup>6</sup>, or 1 × 10<sup>7</sup> genomic equivalent (GE) copies of HuNoV GII.4. Four pigs were used as negative controls. Blood and rectal swab samples were collected after viral infection, and gross legions were examined after necropsy. Diarrhea was induced in 25% and 75% of pigs infected with 1 × 10<sup>6</sup> and 1 × 10<sup>7</sup> GE copies, respectively. Viral shedding was detected in 50%, 75%, and 50% of pigs infected with 1 × 10<sup>5</sup>, 1 × 10<sup>6</sup>, and 1 × 10<sup>7</sup> GE copies, respectively. Viremia was detected in 25% of pigs infected with either 1 × 10<sup>6</sup> or 1 × 10<sup>7</sup> GE copies. When gross lesions of gastroenteritis were investigated, the ileum walls of the infected pigs were thinner than those of the controls. Villi atrophy and inflammatory cell infiltration were identified in the ileum of each infected pig. Viral capsid was identified in the jejunum, ileum, colon, spleen, and mesenteric lymph node. Virus replication was newly verified in the spleen and mesenteric lymph nodes by detection of negative-sense viral RNA. In conclusion, HuNoV GII.4 could induce acute gastroenteritis and replicate in the extraintestinal lymphoid tissues in post-weaning gnotobiotic pigs. Therefore, such pigs would be a suitable animal model for studying the pathogenesis and replication of HuNoV.
A Study on Low-Power Sensor Node based on Event-based Sampling Using Renewable Energy in Greenhouse
Hong-geun Kim,Chulyoung Park,Myeongbae Lee,Yongyun Cho,Changsun Shin,Dongguk Park,Jangwoo Park 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3
In the paper, we proposed low-power sensor node that applied to perform events-based sampling algorithm and to harvest energy through irrigation equipment applicable in greenhouse environment. The system composition to achieve such a goal could be divided into three parts of sensors, data processing and control, and this paper suggests a solution to an unnecessary wasting energy problem by using the event-based sampling to effectively reduce data exchange between the control system composition. Sensor node based on energy harvesting are implemented through micro-hydro generators connected to the irrigation equipment and it is confirmed that transmitting or receiving stable data is possible, reducing energy consumption of sensor node by the algorithm.