Development of Electronics Visual Enhancement Device for Low Vision Handicapped

Yunjung Kwon,Sangyep Nam,Sungchang Lee 대한전자공학회 2005 ITC-CSCC :International Technical Conference on Ci Vol.2005 No.3

A Study on the Retina shaped Optical Path Shift Using the Prism

Yunjung Kwon,Sang Yep Nam,Sungchang Lee 대한전자공학회 2004 ICEIC:International Conference on Electronics, Inf Vol.2004 No.8

밀반죽의 분할과 둥굴이기 시스템설계 및 고찰

권윤중(Yunjung Kwon),이승범(Seungbeom Lee),남상엽(Sangyep Nam) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.4

현대 사회에서 최근 우리나라의 베이커리 산업관련 기술은 빵이 시작된 서양과 어깨를 나란히 할 만큼 성장하여 제과제빵 분야의 세계대회에서 최상위권으로 입상하는 등 눈부시게 발전 하고 있다. 그래서 많은 사람들이 제과제빵분야와 베이커리 카페 등의 부가가치가 높은 사업에 관심을 갖고 뛰어들고 있는 추세이다. 하지만 기술자들의 높은 인건비와 인력관리의 어려움은 베이커리 산업의 성장에 저해요소가 되고 있다. 따라서 밀반죽을 빠르고 정확하게 분할과 둥글리기를 동시에 수행하는 시스템을 설계하고 제작하여 수작업과 비교된 성능을 알아보았다. 주요 기능은 밀반죽의 분할 개수를 원형에서 3개의 트랙으로 만들고 안쪽 트랙에 4개, 중간트랙에 12개, 외각트랙에 20개를 배치하여 36개이다. 한 번의 루틴에서 36개가 완성되므로 많은 양의 에너지가 필요하기 때문에 유압을 이용하였고 둥굴이기는 0.75Kw의 유도전기를 사용하였다. 본 시스템의 실험은 1차 발효를 마친 밀반죽으로 하였다. 밀반죽 36개 합산 량의 덩어리를 본 시스템에서 작업을 하면 36개로 분할과 둥굴이기가 동시에 완성된다. 분할시간 1-9초 사이, 둥굴이기 시간 1-9초 사이로 매우 빠르고 정확하게 완성 된다. 본 시스템은 인력수급이 어려운 베이커리산업에 인건비 절감에 매우 효과적이고 좀 더 위생적으로 만든 제품을 소비자에게 공급할 수 있을 것으로 기대된다. In the present society, our current technology associated with bakery industry has been improved as much as technical development can get abreast of the Western one where the bread has originated and has been awarded and ranked in the highest level of many bakery or pastry competitions. In these trends, many people are running for high value added business such as bakery industry and bakery café, etc. with big interest. However, high labor cost of technician and difficulties in human resource management become obstruction factors in the growth of the bakery industries. Therefore, in this paper, the designed system for both dividing and rounding dough quickly and exactly at the same time was studied. The main function of this system is to divide the original dough into 3 tracks and then, to place 4 doughs in the inner track, 12 doughs in the mid track, 20 doughs in the outer track, totally 36 doughs in a routine. It takes much energy because 36 doughs can be completed in a routine. Therefore, this system uses hydraulic pressure and a 0.75Kw induction motor is used for dough rounding. This system can make primarily fermented dough into 36 divided doughs very quickly and exactly on a guide panel at the desired weight by dividing it within 1-9 seconds and by rounding each within 1-9 seconds. This system is very effective in bakery industry to minimize labor cost and it is expected to supply more hygienic products to the customers.

GPS를 이용한 자동차 비상등 작동 장치

권윤중(Yunjung Kwon),남상엽(Sangyep Nam) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.6

현대 사회에서 자동차는 교통수단의 필수품이 되어 생활의 편리함을 인간이 누리고 있습니다. 반면 늘어나는 차량에 비례하여 교통사고 증가로 인한 피해도 인간의 몫이 되었다. 자동차 주행을 하다보면 전방에 갑자기 나타나는 장애물과 급정거한 차량 등으로 필연적으로 급제동을 한다. 급제동시 시간적 여유가 있을 때는 수동으로 비상등을 켜고, 끌 수 있지만 다급하게 나타나는 장애물에 대해서는 급제동은 인간이 본능적으로 하지만 뒤 차량에 비상을 알릴 수 없어 추돌사고가 발생한다. 본 장치는 GPS를 이용하여 차량의 속도를 종합 분석하여 운전하는 자동차가 비상등을 켜야 하는 상황에서 자동으로 비상등을 작동시킨다. 또한 고속주행이나 저속주행에서 차량의 속도가 계속 감속하거나 정지되면 비상등은 상시 켜져 있고. 차량의 속도가 다시 상승하면 위험을 벗어 난 것으로 판단하여 비상등을 자동으로 꺼준다. 운전차량이 만약 뒤 차량에 추돌되었거나 운전차량이 전복되었을 때 추돌센서가 작동하여 비상등을 수동 리셋 할 때까지 작동하도록 되어있다. 이장치를 이용하면 대형의 교통사고인 연쇄추돌교통사고를 현저히 줄일 것으로 기대 되고 운전 중 운전자가 불필요한 동작과 여유 있는 안전운전에 도움이 됨을 실험을 통해서 확인 했다. Necessities of a traffic means work a car in the modern society human to an usability of a life is enjoying. On the other hand, the damage by traffic accident increment the human quotient worked as we were in proportion to the vehicle which increased. Passing an examination moves necessarily on an obstacle to suddenly appear at the fronts if a car travels and the vehicles which stopped suddenly. Dynamic passing an examination about an obstacle turn on Vehicle Emergency Lamp to by hand when is unhurried, and can turn off, but to appear urgently dynamic passing an examination in time human is instinctive, but cannot inform an emergency to a back vehicle, and a rear-end collision occurs. A car we synthesize a speed of a vehicle, and this unit analyzes as we use GPS, and to drive runs Vehicle Emergency Lamp to automatic in the situations that shall turn on emergencies etc. If a speed of a vehicle continuously slows down in too high-speed driving or low-speed driving, or we are stopped, Vehicle Emergency Lamp is always turned on. It was built if we rise again as clearing itself from risk, and a speed of a vehicle judges, and we turn off Vehicle Emergency Lamp to automatic. It runs till rear-end collision sensor operates, and by hand reset does Vehicle Emergency Lamp a driving vehicle collides from behind to a back vehicle or when a driving vehicle was overthrown. It is shortened very much to the chain rear-end collision traffic accident that is a traffic accident of large size if we use this unit. And we did authentication through the experiment which a driver was helpful to unnecessary operation and a relaxed safe driving during drivings.

강전해수의 PWM전압제어에서 피크전류 문제와 해결

권윤중(Yunjung Kwon) 대한전자공학회 2021 전자공학회논문지 Vol.58 No.12

강전해수는 강알칼리수와 강산성수를 말한다. 강알칼리수는 강력한 세정력이 있고 강산성수는 살균력이 높아 소독수로 사용하고 있다. 강전해수 제조는 염화나트륨이 용해된 물에 양극의 전해 공간과 음극의 전해 공간 그리고 그 사이에 격막을 두고 전기분해를 한다. 전해조에 있는 연화나트륨 용액을 전기분해하기 위한 전압은 일반적으로 PWM전압을 사용한다. PWM전압은 펄스의 폭을 ON과 OFF로 조절하여 쉽게 가변전압을 얻는 방법이다. 농도가 2.5 ppt 정도의 염화나트륨이 용해된 물은 전기저항이 매우 낮다. 염화나트륨이 용해된 물은 전기저항이 낮기 때문에 전기분해용 전극에 흐르는 평균전류만 가지고 평가해서는 큰 문제가 있음을 실험을 통해서 확인하였다. 이러한 문제의 이유는 피크 전압동안 흐르는 피크 전류 때문에 부품의 소손이나 PCB 발화 등을 실험을 통해서 확인하였다. 이러한 문제를 해결하는 방법은 부품을 10배가 넘는 매우 큰 사양으로 설계 할 수도 있다. 하지만 본 논문에서 제시하는 해결책은 스위칭 리니어 전원으로 강전해수의 만족한 결과 값과 부품들이 안전하게 작동하는 것을 확인하였다. Strong electrolyzed water refers to strong alkaline water and strong acidic water. Strong alkaline water has a strong cleaning power, and strong acid water has a high sterilizing power, so it is used as disinfecting water. To manufacture strong electrolyzed water, electrolysis is performed by placing the electrolytic space of the anode and the electrolytic space of the cathode in water in which sodium chloride is dissolved, and a diaphragm between them. The voltage for electrolyzing the sodium sulfide solution in the electrolyzer is generally PWM voltage. PWM voltage is a method to easily obtain a variable voltage by adjusting the pulse width to ON and OFF. Water in which sodium chloride is dissolved at a concentration of about 2.5 ppt has very low electrical resistance. Since water in which sodium chloride is dissolved has low electrical resistance, it was confirmed through an experiment that there is a big problem in evaluating only the average current flowing through the electrode for electrolysis. The reason for this problem was confirmed through an experiment, such as component burnout or PCB ignition due to the peak current flowing during the peak voltage. A way to solve this problem is to design the part to a very large specification of 10 times or more. However, the solution presented in this paper is a switching linear power supply, and it has been confirmed that the satisfactory result value of strong electrolytic water and the safe operation of the components.

알칼리전해조의 역 펄스를 이용한 스케일 제거

권윤중(Yunjung Kwon) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.7

인간은 깨끗하고 건강한 물을 마시기 위해 노력한다. 알칼리이온수기는 건강한 물을 만드는 기능수 제조기로 생체에 일어나는 자유라디칼의 축적과 반응을 억제하고 항산화로 환원시키는 역할을 한다. 이러한 알칼리이온수를 만드는 기기가 알칼리이온수기이다. 알칼리이온수기는 전해조에 음극판을 포함한 음극실과 양극판을 포함한 양극실을 두고 그 사이에 격막으로 막는 구조이다. 전해조에 물을 채우고 전극판에 전압을 가하면 전기분해가 발생하여 양극실에는 산성이온수가 만들어지고 음극실에는 알칼리이온수가 만들어 진다. 여기서 문제는 알칼리이온수가 만들어지는 음극실에 칼슘(Ca⁺), 칼륨(K⁺), 이온과 염류에 의해 칼슘화합물인 탄산칼슘과 탄산염 등의 형성으로 음극실에 스케일이 부착하게 된다. 스케일 부착으로 전기분해를 방해하여 이온수 생성이 불가능하게 된다. 이를 방지하기 위해 전해조 양극 PWM전압에 전압크기가 2배인 역펄스 전압을 합성하여 전극판에 인가하는 방식으로 연구하였다. 실험을 통해 pH변화 없이 스케일부착이 되지 않음을 확인하였다. Humans try to drink clean and healthy water. The alkaline ionizer is a functional water-making machine that produces healthy water. It plays a role of suppressing accumulation and reaction of free radicals occurring in living body and reducing it to antioxidant. The equipment for making such alkaline ionized water is alkaline ionized water. The alkaline ionizer is a structure in which an anode chamber including a cathode plate and a cathode plate including an anode plate is disposed in an electrolytic bath, and an anode chamber is sealed with a diaphragm therebetween. When the electrolytic cell is filled with water and a voltage is applied to the electrode plate, electrolysis occurs to produce acidic ionic water in the anode chamber and alkaline ionic water in the cathode chamber. The problem is that scale is attached to the cathode chamber by the formation of calcium compounds such as calcium, calcium, and calcium ions in the cathode chamber where the alkaline ionized water is produced by the calcium (Ca⁺), potassium (K⁺). Scale attachment interferes with electrolysis, making ionic water generation impossible. To prevent this, a reverse pulse voltage with a voltage magnitude of twice the positive polarity PWM voltage of the electrolytic cell was synthesized and applied to the electrode plate. Through experiments, it was confirmed that scale attachment did not occur without pH change.

산성이온수 농도제어를 위한 Microprocessor를 이용한 PWM 제어

권윤중(Yunjung Kwon),남상엽(Sangyep Nam) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.7

전해 산성이온수는 알칼리성 이온수에 비해 응용분야가 음용을 목적으로 하는 알칼리이온수와 많이 다르게 이용되고 있으며 ph 농도에 따라 강산성인 경우 잔류염소에 의한 살균 목적의 소독제로 사용되고, 중산성인 경우 세척과 세안으로 사용하고, 약산성인 경우 식재료와 혼합하여 요리에 널리 사용할 수 있다. 이런 산성이온수를 생성하기 위해서는 물을 전기분해 하여 사용하는데 전기분해 하는 과정에서 염소가스와 수산화나트륨 등의 물질로 살균력을 가지며, 전기분해시 +전극 쪽으로 -이온을 띤 염소, 인, 유황 등의 유기물이 모여져 산성이온수를 만든다. 또한 산성수와 알칼리수를 분리하기 위해서 격막을 사용했다. ph 농도변화의 구현방법은 Microprocessor를 이용하여 강산성에서 약산성 사이의 ph 농도를 PWM(pulse width modulation) 제어로 3종류의 PWM 전압을 전해조 전극에 인가하여 PWM제어에 의한 연속적으로 농도가 조절된 산성수가 생성되게 구현하였다. We are used with the alkaline ion water which an application field does to object for drinking water compare with the alkaline ion water which asked ion acid electrolysis so as to be very different. This is used with sterilization disinfection use by residual chlorine in case of strong acidity according to ph intensity, and in case of middle acidity use by washing and face washing, and mix with meal materials in case of weak acidity widely usable in cooking. Acid ion water generates as we electrolyze water. Chlorine gas and sodium hydroxide etc. was generated at electrolysis process, and we have toward sterilizing power. Derelicts such as chlorine, phosphorus, sulfur etc. are gathered from a negative ion, and we make acid ion water to + electrode direction in electrolysis. We used a diaphragm in order to disconnect too acid water and alkaline water. We implemented so that the acid water which it came down to three kinds of PWM voltage to PWM (pulse width modulation) control, and implementation method of ph intensity change authorized ph intensity between weak acidity to electrode in strong acidity as we used Microprocessor, and intensity was adjusted successively by PWM control was generated.

CO₂ emissions correction of light-duty vehicles based on an energy deviation analysis method

Oh, Yunjung,Kwon, Sang Il,Park, Sungwook Pergamon 2017 Transportation Research Part D. Transport & Enviro Vol.56 No.-

<P><B>Abstract</B></P> <P>In present study, a total of 3 types of light-duty vehicles were tested for 7 types of driving modes by using a vehicle dynamics-based simulation method. Deviations between the target and actual test vehicle speed and inaccurate chassis dynamometer road load settings are selected as the two main factors affecting the CO<SUB>2</SUB> emission measurement test. 126 cases of simulations were conducted to analyze the effects of the deviation between the target and actual test vehicle speed on CO<SUB>2</SUB> emissions and 63 cases of simulation were conducted to analyze the effectiveness of inaccurate road load test conditions on CO<SUB>2</SUB> emissions. Then, the CO<SUB>2</SUB> correlation method proposed by World Forum for Harmonization of Vehicle Regulations (WP.29, UN) was applied for simulated results in original simulation cases, and a correction to performance was validated by comparative analysis. From the simulation results, it is revealed that velocity and road load deviation are related to distinct changes in fuel efficiency and CO<SUB>2</SUB> emission rates of test vehicles. Also, it is revealed that CO<SUB>2</SUB> correction method show good performance to reduce the relative error lower than 2% in all test cases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3 types of light-duty vehicles were investigated by using a vehicle dynamics-based simulation method. </LI> <LI> Chassis dynamo test result was affected by deviation against target speed and inaccurate road load condition. </LI> <LI> The CO<SUB>2</SUB> correlation method based on total work deviation was applied to reduce a relative error. </LI> <LI> When applying the correction method, the relative error of CO<SUB>2</SUB> emission converged within 2% in all cases. </LI> <LI> CO<SUB>2</SUB> correction method will be a good solution to advance reliability of chassis dynamometer test results. </LI> </UL> </P>

Surface engineered poly(dimethylsiloxane)/carbon nanotube nanocomposite pad as a flexible platform for chemical sensors

Hwang, Yunjung,Park, Jeong Yong,Lee, Chang-Soo,Kwon, Oh Seok,Park, Sung-Hoon,Bae, Joonwon Elsevier 2018 Composites Applied science and manufacturing Vol.107 No.-

<P><B>Abstract</B></P> <P>This study demonstrated the sensing performance of surface-patterned poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT: 3–5 wt%) nanocomposite pads. PDMS/CNT nanocomposite pads as a flexible sensing platform were prepared by employing a series of techniques: 3-roll milling for mixing, 2-roll for pad formation, and imprinting for pattern development. Then, tailored surface engineering strategy was introduced. First, the silane coupling agent was incorporated to improve the surface compatibility of the nanocomposite pads. The change in surface property was monitored by shift in contact angle from 132 to 141°. Subsequently, the beta-cyclodextrin (CD) molecules were introduced as a sensing medium through a simple bio-conjugation reaction. The nanocomposite pads showed a sensitive response to methylparaben (MePRB), a representative preservative for cosmetics through host-guest interactions between CD and MePRB in the range of 1–100 nmol. Owing to the surface hydrophobicity of the nanocomposite pads, the sensor was found most effective under nonpolar solvents. The feasibility of surface engineered PDMS/CNT pad as a flexible sensor was demonstrated by measurement after 50 times manual bending. This study can be a useful example for the application of nanocomposites that show unique surface structure and properties.</P>

우리나라 국민의 납 노출수준 및 영향요인 파악

한윤정(Yunjung Han),백용욱(Yong-Wook Baek),유지영(Ji-Young Yoo),권영민(Young Min Kwon),전혜리(Hye-Li Jeon),이나영(Nayoung Lee),유승도(Seung Do Yu),최경희(Kyung-Hee Choi) 환경독성보건학회 2016 한국독성학회 심포지움 및 학술발표회 Vol.2016 No.10