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Estimation of Electrode Consumption using Mast Position in Electric Arc Furnace
Kyuhwan Kim,Jae Jin Jeong,Taewon Kim,Sang Woo Kim 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In order to automate the electrode replacement process, it is necessary to estimate the electrode consumption. Because the electrode controller lowers the electrode according to the electrode consumption, it is possible to estimate the consumption by measuring the position of the electrode. However, due to the structure of the electrode and the electrode arm, it is difficult to measure the electrode position directly. Thus we measured the position of the mast which holds up the electrode arm. In order to determine when to replace the electrode, it is necessary to know the consumption of the electrode per operation. So, we calculated the representative value of the mast position for every operation. Then, we analyzed the changing trend of the representative values of the mast position to estimate the electrode consumption. Also, because the arc length increases about 1 cm when the arc voltage increases 10 V, we modified the representative values and estimated the electrode consumption. The results which were obtained from the analysis of the mast position are in good agreement with the real operation pattern.
Two-Step Nickel Plating Technique for Fabrication of MEMS Electrostatic Microjet Injector
Jinwoo Jeong,Kyuhwan Jung,Kuk jin 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In this paper, two-step nickel plating technique with high plating rate and good thickness uniformity is explored for the purpose of fabrication of MEMS electrostatic microjet injectors. The electrostatic microjet injector is composed of composed of micro nozzles and high pressure micropump with thick nickel membrane. The effect of nickel membrane parameters on pull-in voltage is investigated. Then two-step plating technique is suggested for the fast fabrication of thick nickel membrane. From the experimental results, good uniformity of 13% and high plating rate of 0.6 ㎛/min are obtained. These results are consistent with the literatures and acceptable for the fabrication of microjet injector.
MATLAB의 Auto code generation과 Verification 기능을 이용한 자동차 실내램프 시스템 검증에 관한 연구
이규환(Kyuhwan Lee),정이화(Leehwa Jeong),경태호(Taeho Kyung),홍인표(Inpyo Hong),구자용(Jaryong Ku) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, Software design is developed by regular procedures. But these regular procedures are difficult to fulfill in the field. The field can be changed the project in coding or test step by the change of requirements or the occurrence of a problem. Model-Based Design is proposed this problem solution. Model-Based Design is recycled in various stages of design information. So, the design method can be modeling and simulation before to the real hardware. This Model-Based Design’s typical program is the MATLAB. The interior lamp of automotive is developed very much. Recent interior lamp is not simple. The interior lamp functions are only lamp ON or OFF function but also CAN communication, Data processing, Input processing, analysis and results output function. This function is working used MCU(microcontroller unit). Also center fascia is have very many function. So, this place can’t add function. For that reason, interior lamp is including something of user indirect control like bluetooth module. Reliability is important in interior lamp because of this complicated function. And this reliability of products raises the commercial value. So this paper is suggested development method of interior lamp system using MATLAB.
차량용 멀티미디어 디바이스를 위한 적외선 방식 모션인식 중앙 조작계 개발
이규환(Kyuhwan Lee),정이화(Leehwa Jeong),경태호(Taeho Kyung),홍인표(Inpyo Hong),민한음(Hanum Min) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, IT industry is in fast growth. And very much IT convenient device for life is developed. This has been emerged as core technology in automotive industries. And some of these products have unintended malfunctions. because of the environment of driving, the device can cause a driver’s momentary carelessness. And this carelessness can cause a traffic accident. Wierwille & Tijerina(1996) studied about car crash in North Carolina. In study, a driver’s carelessness accident is 55.5% of 2,819 accidents. This result means accident can be happen by ordinary action like changing channel of radio. So, many people are studing a simple control method. This paper suggests this control method using IR sensor. The method can simply control increased devices. And It can decrease carelessness action for safe drive. Used IR sensor gets 3 IR LED data. The 3 IR LED is used to recognize hand motion like directions of right, left, up and down. These motions are used to control devices like radio, MP3, navigation. This is more safer control than before because this needs not to find the controller’s location exactly.
Virus-mimetic polymer nanoparticles displaying hemagglutinin as an adjuvant-free influenza vaccine
Lee, Chaeyeon,Jeong, Jonghwa,Lee, Taeheon,Zhang, Wei,Xu, Li,Choi, Ji Eun,Park, Ji Hyun,Song, Jae Kwang,Jang, Sinae,Eom, Chi-Yong,Shim, KyuHwan,Seong Soo, A.An,Kang, Young-Sun,Kwak, Minseok,Jeon, Hyeon Elsevier 2018 Biomaterials Vol.183 No.-
<P><B>Abstract</B></P> <P>The generation of virus-mimetic nanoparticles has received much attention in developing a new vaccine for overcoming the limitations of current vaccines. Thus, a method, encompassing most viral features for their size, hydrophobic domain and antigen display, would represent a meaningful direction for the vaccine development. In the present study, a polymer-templated protein nanoball with direction oriented hemagglutinin1 on its surface (H1-NB) was prepared as a new influenza vaccine, exhibiting most of the viral features. Moreover, the concentrations of antigen on the particle surface were controlled, and its effect on immunogenicity was estimated by <I>in vivo</I> studies. Finally, H1-NB efficiently promoted H1-specific immune activation and cross-protective activities, which consequently prevented H1N1 infections in mice.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Arc Stability Index Using Phase Electrical Power in AC Electric Arc Furnace
SeungHun Kim,Jae Jin Jeong,KyuHwan Kim,Jong Hyun Choi,Sang Woo Kim 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In AC electric arc furnace, the state of the arc is a major concern to save the electrical power and to increase the productivity. There have been several researches about the arc stability index, such as the index based on the direct measurements of arc current and the index using the three-phase to ground voltage. In this paper, a modified index, which considers the concepts of both voltages and currents, is introduced. This index is the mapped phase electrical power by a mapping function, and the electrical power is calculated from the phase to ground voltages and currents. The simulations of various cases are performed, and the modified index shows a good performance in analyzing the arc state compared to existing index.
촬영 빈도수 및 소독 주기에 따른 영상의학과 감염 관리
이재승(Jaeseung Lee),정규환(Kyuhwan Jeong),김경희(Gyounghee Kim),임인철(Inchul Im),권대철(Daecheol Kweon),구은회(Eunhoe Goo),동경래(Kyungrae Dong),정운관(Woonkwan Chung) 한국방사선학회 2011 한국방사선학회 논문지 Vol.5 No.2
Questionnaires were distributed to Radiology departments at hospitals with 300 sickbeds throughout the Pohang region of North Gyeongsang Province concerning awareness and performance levels of infection control. The investigation included measurements of the pollution levels of imaging equipment and assistive apparatuses in order to prepare a plan for the activation of prevention and management of hospital infections. The survey was designed to question respondents in regards to personal data, infection management prevention education, and infection management guidelines. The ATP Public Heath Monitering System was used to measure seven items for pollution levels of imaging equipment and assistive apparatuses in the Radiology Department. Data was analysed using SPSS version 12.0 for paired t-test and Pearson coefficient with a statistically significant level of 0.05. The results of the survey showed a total awareness level of infection management prevention education averaged at 3.73 ± 0.64 and performance levels resulted at 3.39 ± 0.83 which were statistically significant (p = 0.01). Also the measurements of pollution levels for equipment with high patient contact showed a Pearson Coefficient of over 0.5 implying a focus on pathogenic bacterium. There was no statistical significance with the frequency of imaging (p <0.05). Therefore for general hospitals with high patient contact, there is a need to supply analyzing equipment for real time monitoring and the implementation of disinfection management that uses a Ministry of Health and Welfare approved antiseptic solution twice every minute. 경상북도 포항지역의 300병상 규모의 병원에서 영상의학과의 감염관리에 대한 인지도 및 수행도를 설문 조사하고 촬영 장비 및 보조기구 등의 오염도를 측정하여 병원감염의 예방과 관리를 활성화하기 위한 방안을 마련하고자 하였다. 설문 조사는 응답자의 인적사항, 감염관리 예방교육, 감염관리지침에 따른 영역별 질의로 구성되어 있으며 오염도 측정은 ATP 공중위생 모니터링 시스템을 이용하여 영상의학과 촬영 장비 및 보조기구들에 대하여 7개 항목을 측정하였다. 자료의 분석은 SPSS version 12.0에서 paired T-test, Pearson의 상관분석을 이용하였으며 유의확률은 0.05이하(p<0.05)로 검정하였다. 설문조사 결과 감염관리위원회의 설치 및 담당부서, 감염관리 지침서를 구비하고 있었으나 감염관리 예방교육에 대한 전체 인지도는 평균 3.73 ± 0.64, 수행도는 3.39 ± 0.83으로 비교적 낮게 조사되었으며 유의한 차이를 보였다(p = 0.01). 또한 오염도 측정 결과 환자의 접촉이 많은 기구에서 Pearson 상관계수가 0.5보다 크게 나타나 병원균이 집중되어 있음을 알 수 있었으며 촬영 빈도수는 유의한 차이를 보이지 않았으나(p> 0.05) 소독주기는 유의한 차이를 보였다(p <0.05). 따라서 환자의 접촉이 많은 종합병원의 경우 실시간 모니터링이 가능한 분석기를 비치하고 보건복지부가 고시한 소독액을 이용한 1분 이상 2회의 주기적인 소독 관리가 필요할 것으로 사료된다.