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A Pen-Pressure-Sensitive Capacitive Touch System Using Electrically Coupled Resonance Pen
Changbyung Park,Sungsoo Park,Ki-Duk Kim,Sanghui Park,Juwan Park,Byunghoon Kang,Yunhee Huh,Gyu-Hyeong Cho IEEE 2016 IEEE journal of solid-state circuits Vol.51 No.1
<P>A touch system sensing pen-pressure of the proposed electrically coupled resonance (ECR) pen is implemented, which can replace costly digitizer system containing electro magnetic resonance (EMR) and capacitive touch system. The proposed system detects the location of the ECR pen and finger using proposed position sensor, and senses pen-pressure of ECR pen using proposed pen-pressure sensor. For the position sensor, to detect even small variation of the mutual capacitance on touch screen panel (TSP) of the pen, a simultaneous driving scheme is proposed with modified Hadamard matrix, resulting in highly increased dynamic range and SNR. In the proposed pen-pressure sensor, the resonant frequency of the ECR pen is measured by a frequency to voltage converter based sensor. The measured SNR for the pen position is 49 dB with 1 mm phi metal pillar, and 6.5-bit resolution is achieved for pen-pressure sensor in 6 sigma criteria.</P>
Juwan Park,Changhyun Koh,Woongchul Choi 대한미용의학회 2017 대한미용의학회지 Vol.1 No.2
Asian eyelids have different anatomical structures compared to Western eyelids; accordingly, the standards for the “beauty of eyes” vary among races and countries and have also changed with time. With increasing interest in cosmetic surgery, Korean cosmetic techniques and beauty standards have become wide spread in China and other Southeast Asian countries due to the influence of the Korean wave. The recent trend of beauty is naturalism. Although cosmetic operations are being performed, the inconvenience caused by the operation should be minimal, and a natural look is preferred. That is, minimally invasive surgery is necessary. To minimize unnecessary complications and to improve cosmetic and functional satisfaction with minimal invasion and uncomplicated methods according to the individual patient’s condition, we must thoroughly understand the characteristics of eyelid anatomy and function of Asian eyelids. Therefore, we describe the surgical procedure for successful upper eyelid surgery based on the characteristics of Asian eyelids. Level of Evidence: V
A chromogenic molecular capsule attributable to dipolar amide resonance structure
Park, Yeon Sil,Park, Juwan,Paek, Kyungsoo The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.27
<P>A new chromogenic, self-assembled molecular capsule G@2<SUB>2</SUB> is developed by introducing four (<I>N</I>,<I>N</I>-dimethyl-4-aminophenyl) azobenzyl moieties on the upper rim of a resorcin[4]arene-based amidoimino-cavitand. The tuning of conjugation between amido and (<I>N</I>,<I>N</I>-dimethyl-4-aminophenyl)azobenzyl groups by acid–base titration allows naked-eye detection of molecular capsule formation.</P> <P>Graphic Abstract</P><P>A new chromogenic, self-assembled molecular capsule G@2<SUB>2</SUB> is developed by introducing four (<I>N</I>,<I>N</I>-dimethyl-4-aminophenyl) azobenzyl moieties on the upper rim of a resorcin[4]arene-based amidoimino-cavitand. The tuning of conjugation between amido and (<I>N</I>,<I>N</I>-dimethyl-4-aminophenyl)azobenzyl groups by acid–base titration allows naked-eye observation of molecular capsule formation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc10412a'> </P>
Juwan Kang,Hojeong Choe,Jung-Joon Park 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
This study was conducted from November 2016 to March 2017 for the development and evaluation of the biologicalcontrol of the two spotted mite (Tetranychus urticae; TSSM) in the strawberry greenhouses. Natural enemy plot and conventionalplot were selected to compare the mean density of T. urticae. T. urticae was sampled by taking three leaflets (1 stalk)from each plant (3 three-leaflet) leaves from each sampling position. Natural enemy plot was released with Phytoseiuluspersimilis and conventional plot was sprayed with pesticides(abamectin, cyenopyafen, etc). Each stage of TSSM densitywas higher in conventional pesticides than natural enemy. Spatial Analysis by Distance IndicEs (SADIE) was used toanalyze spatial distribution and index of aggregation , index of clustering , were used to investigate the spatialdistribution. Also, the clustering indices were mapped as red-blue plot. As a result, The spatial distribution of T. urticaewas varied, particularly, feeding ability and density of P. persimilis caused regular spatial distribution of T. urticae.
김주완(Juwan Kim),정영석(Youngsuk Jung),박광근(Kwangkun Park),조기주(Kie-Joo Cho),오승협(Seung-Hyub Oh) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
발사체의 추진제탱크 가압 방식에는 여러 가지가 존재한다. 한국형발사체의 경우 저온 헬륨을 가열하여 추진제탱크를 가압하는 방식을 사용한다. 이러한 저온 헬륨을 이용한 가압 방식은 가압가스와 추진제 간의 반응성이 낮고, 무게를 줄일 수 있으며, 재점화가 가능하다는 장점을 지니고 있다. 저온 헬륨은 발사 준비 과정 동안 충전이 되고, 발사 취소 시에 배출된다. 본 논문에서는 이러한 저온 헬륨 충전/배출 과정을 해석하였다. 해석 결과 총 충전 시간은 1, 2, 3단 각각 2400, 1300, 520초이다. There are several methods of propulsion tank pressurization in launch vehicle. In KSLV-II, cold helium is used for pressurization of propulsion tank. The advantages of cold helium pressurization system are chemical nonreactive, weightless, restartable etc. Cold helium is charged during launch operation and discharged during launch abort. In this paper, the process of cold helium charging/discharging is analyzed. The total charging times of cold helium are about 2400, 1300 and 520 sec respectively, 1<SUP>st</SUP>, 2<SUP>nd</SUP> and 3<SUP>rd</SUP> stage.