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아이의 안전한 성장을 위한 실시간 IOT 다기능 요람 서비스
강성은(SeongEun KANG),박경용(KyunGyung PARK),유무종(MooJong YU),남중길(JoongGil NAM),오지원(JiWon OH),류정규(JeongGyu Ryu),문상국(SangKug MOON) 한국정보기술학회 2019 Proceedings of KIIT Conference Vol.2019 No.11
요람은 요람의 단일 기능만을 사용할 수 있다. 그러나 우리가 제작하는 요람은 36개월 이하의 성장기 아이들의 하루 평균 수면 시간을 파악할 수 있고 일별, 주별, 월별 그래프로 나타내어 아이들이 적절하게 수면하고 있는지를 파악할 수 있다. 또한, 아이들의 낙상사고를 방지하기 위하여 개발한 방법은 부모님이 좀 더 안심하고 다른 일을 할 수 있게 한다. 그리고 부가적으로 들어있는 온·습도 센서와 가스 센서, 미세먼지 센서 등 아이들을 위한 많은 기능의 정보들을 APP을 통해 제공하고자 한다. The current cradle can only use a single function of the cradle. However, the cradle we make can show the average sleep time of growing children and show them in daily, weekly and monthly graphs to see if they are sleeping properly. In addition, the method developed to prevent the fall of children allows parents to do other things with more peace of mind. In addition, the APP will provide information on many functions for children, such as temperature and humidity sensors, gas sensors, and fine dust sensors.
조성우(Sungwoo Cho),유성은(Seongeun Yu),정대봉(Daebong Jung),민경덕(Kyungdoug Min) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This research focused on analysis of energy flow in parallel hybrid electric vehicle system. Hybrid Powertrain system includes much more equipment than conventional system, so it is not easy to pick up the point which causes low system efficiency. By calculating from chemical energy of fuel to kinetic energy delivered on wheel, however, energy flow chart can be diagramed. And conversion efficiency computed with this chart can help researchers to know which step caused more energy loss than expected. CAN is used as data acquisition method, as it is more brief way to get the driving parameter than any other method in chassis test situation. Most of all, CAN communicates real driving parameter which is used in ECU communication, it would be the most reasonable method in analyzing energy flow.
하이브리드 파워트레인의 엔진 재시작 및 감속 구간에서 탄화수소 배출물 및 엔진 제어 특성 분석
온형석(Hyungseuk Ohn),유성은(Seongeun Yu),민경덕(Kyoungdoug Min) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Stringent regulation of exhaust emission and improvement of fuel economy have become major issues in the automotive industry. Hybrid electric vehicle (HEV) can be one of the crucial alternative plans over current conventional vehicle, but they have drawbacks such as the increase of engine out total hydrocarbon (THC) emissions and the deterioration of combustion stability at frequent engine stop and restart. This study performs experimental investigation to obtain a better understanding of THC emission characteristic at engine restart and deceleration driving on a HEV powertrain of parallel motor/generator type. Using a fast response Flame Ionization Detector (FFID) and specified tool for cycle by cycle and cylinder to cylinder, the combustion and engine control characteristic was analyzed during transient state of hybrid powertrain. The experimental conditions cover variation of high voltage battery State of Charge (SoC), spark ignition timing and injected fuel mass. As an experimental result, we can unearth the effects of spark ignition timing and injected fuel mass control for combustion stability during engine restart.
Jeongwoo Lee,Kookeui Hong,최승목,Seongeun Yu,최회명,민경덕 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.4
As vehicle emissions regulations have become stricter, improving injection strategies and using high EGR rates has become important to reduce engine-out emissions. Previous research has found that, a multiple injection strategy with a pilot or post injection has the potential to improve the distribution of the air-fuel mixture or oxidation. Thus, it is important to determine the effect of multiple injection strategies on the engine-out emissions. Especially, since the latest diesel engines have used high EGR rates to reduce NOx emission, the target of emissions is different from that of moderate EGR rate condition. Under heavy EGR rate condition, it is needed to improve combustion efficiency by reduction of CO and THC emissions. Therefore, in the first research as part 1, the effects of pilot injection on the engine-out emissions were systemically evaluated for two different EGR rate conditions (30 % and 60 %). The characteristics of the pilot injection were different between the two EGR rate conditions because the behavior of diesel combustion is significantly different when the EGR rate is changed. This research condition was investigated using varying injection parameters such as the timing and quantity of the pilot injection. The results show that each different pilot injection strategy was suggested between two EGR rate conditions to reduce engine-out emissions. Under moderate EGR rate condition, very earlier pilot SOI with large amount has the potential to reduce NOx and PM emissions simultaneously. On the other hand, under heavy EGR rate condition, the closest pilot SOI to main SOI has the potential to reduce CO and THC emissions.
김현준(Hyounjun Kim),배진우(Jinwoo Bae),유성근(Seongeun Yu),김동호(Dongho Kim) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.6
변전소 시설에서 사용되는 기존 전력설비 감시시스템은 관리 디바이스에 이상 이벤트가 발생했을 때, 이를 확인하기 위해 관리자가 디바이스 정보를 직접 조회해야 한다. 이번 연구를 통해, 관리자의 효율성을 높이기 위한 솔루션을 제안한다. 시스템이 제어하는 각각의 디바이스에서 발생 가능한 이벤트를 구분해서 TTS 기술을 활용해 경보상태 인지를 높이고자 한다. 또한, STT 기능을 활용한 음성명령 조회 기능을 추가하고 이를 고도화 하기 위한 한국어 음성명령 보정을 통해 관리자의 시스템 제어 효율성 향상을 목표로 한다. The existing power facility monitoring system used in substation facilities requires the administrator to directly inquire the device information to check when an abnormal event occurs on the management device. Through this work, we propose as a solution to increase the efficiency of managers. We want to distinguish events that can occur on each device controlled by the system and increase alert status by utilizing TTS technology. In addition, we aim to improve the system control efficiency of managers by adding voice command lookup functions using STT functions and correcting Korean voice commands to enhance them.
최회명,이정우,Kookeui Hong,Sangyul Lee,최승목,Seongeun Yu,민경덕 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7
To draw a comparison of the effect of multiple injection strategy on the engine-out emissions under two different EGR rate conditions,the effect of pilot injection on emissions and combustion was evaluated and discussed in part 1. Thus, in the second research as part 2, the effects of post injection on the engine-out emissions were systemically evaluated for two different EGR rate conditions (30 % and 60 %). Since the behavior of diesel combustion is significantly different as EGR rate is changed, the characteristics of post injection was different between two EGR rate conditions. This research was investigated as varying injection parameters such as the timing and quantity of the post injection. The results show that the close post injection with injection interval as 10 degree has the potential to reduce PM emission,regardless of EGR rate. However, the reason of reduction of PM emission is different for each case. For a moderate EGR rate condition,close post injection with interval 10 degree enhances the fuel at bottom of bowl. Thus, the distribution of fuel can be improved. On the other hand, for a heavy EGR rate condition, close post injection with interval 10 degree has the charge cooling effect to prolong the ignition delay, rather than well-matched injection targeting. Especially, there is an effect to oxidize PM emission under moderate EGR rate condition as post injection is applied. However, post injection for late cycle of combustion under heavy EGR rate condition does not oxidize PM emission due to low oxygen concentration (~ 10%).
마일드 하이브리드 차량에서 배터리 SoC에 따른 엔진의 작동효율 분석
조성우(Sungwoo Cho),정대봉(Daebong Jung),유성은(Seongeun Yu),민경덕(Kyungdoug Min) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This research focuses on the effects engine operating efficiency between battery SoC level in mild type hybrid electric vehicle. Although Hybrid electric power train system has been highlighted with potentials in low fuel consumption and exhaust gas emission, it is not easy matter to actualize these strengths. Hybrid electric power train system includes both engine system and electric system, so it is inevitable thing to optimize two different kinds of systems for ideal results. In this research, chassis driving test was conducted in different initial battery SoC condition. Based on experimental data, relation between engine efficiency and battery SoC was analyzed.