Application System to Display 3D Footwear Model on the Foot

Da Un Jung,Yung Ho Seo,Jong-Soo Choi 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

Development of the application system which can be used in real life is currently a main topic in computer vision. In this paper, we propose a new application system which wears footwear model. Our system provides virtual appearance. User can see their appearance whether it is suitable or not. We present implementation of our proposed system and experimental result.

Production of Cellulase by Penicillium sp. KL1 in a Batch Fermentor

Jung DA UN,Hah Young YOO,Ja Hyun LEE,Young Joon SUH,Soo jeong YANG,Keun KIM,Chulhwan PARK,Seung Wook KIM 한국생물공학회 2013 한국생물공학회 학술대회 Vol.2013 No.4

Effects of TiN Coating on the Fatigue Fracture of Dental Implant System with Various Cyclic Loads

Da-Un Jung,Chae-Heon Chung,Mee-Kyoung Son,Han-Cheol Choe 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6

The purpose of this study was to investigate effects of TiN coating on the fatigue fracture of dental implant system with various cyclic loads. TiN coated abutment screw, the fixture, and abutment of internal hex type were prepared for fatigue test. The fatigue test was carried out according to ISO 14801:2003(E) using tensile and compression tester with repeated load from 30% to 80% of static fracture force. Morphology and fractured surface was observed by field emission scanning electron microscope(FE-SEM) and energy dispersive Xray spectroscope(EDS). The fracture cycle drastically decreased as repeated load increased. Especially, in the case of TiN-coated abutment screw, fracture cycle increased compared to non-coated abutment screw. The fatigue crack was propagated fast as repeated load increased. The plastic deformation region decreased, whereas, cleavage fracture region increased as repeated load increased.

Jean Rhys's Wide Sargasso Sea

Jung, Da-Un Ewha Institute of English and American Studies 2005 Journal of English and American studies Vol.4 No.-

This paper tries to retrace how Jean Rhys undercut the black native woman Christophine to make the Creole protagonist Antoinette conspicuous in her well-known post-colonialist novel Wide Sargasso Sea. In so doing, this paper adopts post-colonialist theories presented by the two representative post-colonialist feminists Gayatri Spivak and Firdous Azim. Spivak points out that Rhys sacrifices the black native charavter Christophine to reveal Creolean suffering under the colonial setting of the West Indies. Azim reinvestigates the nineteenth century English novel from post-colonial perspectives taking into account differences between gender, class and race. Jean Rhys' narrative techniques are being criticized for their narrowness of taking advantage of blackness to emphasize double identity of white Creoles in the West Indies. While Rhys discloses complicate racial strata in describing heightened tension between different races and classes, she fails to sustain distinct character of the black nurse Christophine and the black community. By failing to fully represent the blackness, Wide Sargasso Sea has a fatal flaw as a representative post-colonialist novel.

Nonenzymatic flexible field-effect transistor based glucose sensor fabricated using NiO quantum dots modified ZnO nanorods

Jung, Da-Un-Jin,Ahmad, Rafiq,Hahn, Yoon-Bong Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.512 No.-

<P><B>Abstract</B></P> <P>Herein, we fabricated nonenzymatic flexible field-effect transistor (f-FET) based glucose sensor using nickel oxide quantum dots (NiO QDs) modified zinc oxide nanorods (ZnO NRs). The ZnO NRs surfaces were coated with NiO QDs using radio frequency (RF) magnetron sputtering to enhance the electrocatalytic feature and the surface area of ZnO NRs. Under physiological conditions (pH 7.4), the nonenzymatic f-FET glucose sensor shows two linear ranges of 0.001–10mM and 10–50mM with the high sensitivity of 13.14μAcm<SUP>−2</SUP> mM<SUP>−1</SUP> and 7.31μAcm<SUP>−2</SUP> mM<SUP>−1</SUP>, respectively, along with good selectivity, stability and repeatability during glucose detection. The examination of human whole blood and serum samples reveal that the nonenzymatic f-FET based glucose sensor is capable of measuring glucose concentration efficiently in the presence of interfering species and thus can be offered as a promising device for further applications in clinical and non-clinical fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A non-enzymatic flexible FET based glucose biosensor was fabricated. </LI> <LI> Grown ZnO NRs between source-drain were modified with NiO QDs by sputtering. </LI> <LI> An enhanced electrocatalytic features were recorded for glucose detection. </LI> <LI> The proposed sensor showed wide-linear range, high sensitivity and a low detection limit. </LI> <LI> Successfully used for human whole blood sample and serum sample analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

A new interface using image-based foot tracking for motion sensing devices

Da-Un Jung,Yong-In Yun,Jong-Soo Choi IEEE 2012 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.58 No.3

<P>Foot interfacing has applications in games that require foot manipulation control using motion sensing devices. However, when part of a foot overlaps itself (selfocclusion), is out of the line of sight of the infrared sensor and it is then difficult to accurately capture foot pose. To overcome this problem, we propose a real-time motion sensing method based on 3-dimensional motion estimation. Our method employs pose parameters that are acquired using the ground plane and camera coordinates. This enables an assessment of the positions of the two joints that comprise a skeletal foot model. The proposed approach can capture a foot's 3-dimensional information that an infrared sensor may miss; therefore, motion sensing device's pose estimation results improve. According to the tracking and experimental results, the proposed method is applicable for use by motion sensing devices.</P>

Cervical pessary for preterm twin pregnancy in women with a short cervix

( Da Un Jung ),( Min Jung Choi ),( Sun Young Jung ),( Suk Young Kim ) 대한산부인과학회 2020 Obstetrics & Gynecology Science Vol.63 No.3

Objective We aimed to evaluate the effectiveness of cervical pessary for extending twin pregnancy in women with a short cervix. Methods Between January 2014 and March 2019, the use of a cervical pessary for twin pregnancy in women with a cervical length of ≤15 mm was investigated between 16 and 28 weeks of gestation. We included women with a shortened cervix after a cerclage procedure and visible fetal membranes and cervical dilatation. Thirteen patients underwent pessary insertion and were matched with a control group of 15 patients. Pregnancy and neonatal outcomes were compared between the groups. We excluded women with major fetal anomalies discovered before or after birth and known placenta previa. Results Women who underwent pessary insertion were diagnosed with a short cervix (0.65±0.47 vs. 0.66±0.51 cm in the pessary and control groups, respectively; P=0.957) at a gestational age similar to that of the controls (23.29 vs. 25.14 weeks, P=0.294). There was no significant difference in gestational age at delivery between them (33.29 vs. 27.29 weeks in the pessary and control groups, respectively, P=0.058). The pessary group had a longer interval between the diagnosis and delivery than the control group (60.7±28.3 vs. 22.6±24.5 days, P=0.001). The number of adverse neonatal outcomes was significantly lower in the pessary group (n=7; 28.0%) than in the control group (n=14; 58.3%; P=0.032). Conclusion The use of a cervical pessary may prolong gestation in twin pregnancies in women with an extremely short cervix until viable gestational age.

스테레오 카메라로부터 실시간 가상 착용을 위한 발동작 검출

정다운(Da Un Jung),윤용인(Yong-In Yun),최종수(Jong-Soo Choi) 한국멀티미디어학회 2008 멀티미디어학회논문지 Vol.11 No.11

증강현실을 응용한 실시간 영화정보 제공 시스템에 관한 연구

정다운(Da Un Jung),마정연(Jung Youn Ma),조우식(Woo sik Cho),서융호(Yung Ho Seo),김태용(Tae Yong Kim),최종수(Jong Soo Choi) 한국HCI학회 2006 한국HCI학회 학술대회 Vol.2006 No.2

Vibration Analysis of the Temporomandibular Joint Sounds

정다운(Jung Da-un),정재현(Jung J-Hyun),강동완(Kang Dong-wan) 대한치과의사협회 2008 대한치과의사협회지 Vol.46 No.4

관절잡음의 발생은 측두하악 관절의 구조적, 기능적 이상의 징후로 여겨져왔다. 이러한 관절잡음을 평가하는데 electrovibratography가 비침습적이고 신뢰할만한 방법으로 제시되어 왔으며 이를 통해 관절잡음의 진동수와 진폭 및 전체 에너지 양상을 숫자화하고 도식화 하는 것이 가능하게 되었다. 기존의 연구에서 여러 가지 관절잡음의 양적, 질적 분석이 시도되어 왔다. 이번 연구의 목적은 관절 잡음이 도시화되어 나타나는 frequency spectrum pattern을 integral>300㎐/<300㎐ ratio와 함께 분석하는 것이다. 본 실험에서는 Joint Vibration AnalysisTM를 사용하여 측두하악 관절 장애의 증상이 없는 10명의 대조군과 관절잡음과 동통이 있으나 개구제한을 보이지 않는 정복성 관절원판 변위의 범주에 있는 20명의 실험군에서 관절진동을 분석하였으며 관절진동 기록 시에 Jaw tracker를 함께 사용하여 개패구시 관절잡음 발생의 위치를 감별하고 치아접촉음을 배제하여 관절잡음을 분석하였다. 그 후 실험군을 frequency spectrum pattern에 따라 4가지 하위 그룹으로 나누어 분석하였다. 실험 결과 실험군과 대조군의 하위 그룹 1에서 유사한 frequency spectrum pattern과 ratio범위를 보였으며 실험군의 하위 그룹 2, 3, 4에서는 더 불규칙한 에너지 양상을 보이는 frequency spectrum pattern과 더 큰 ratio가 관찰되었다. 이번 연구를 통해 Joint Vibration AnalysisTM가 악관절 진동의 특성을 감별하는데 유용함을 알 수 있었고 Joint Vibration AnalysisTM를 이용한 지속적인 진동 분석이 환자 교육뿐 아니라 성공적인 턱관절 기능이상의 진단과 치료에 유용할 것으로 사료된다. We used Joint Vibration Analysis(JVA) in the BioPAK system(Bioresearch, Inc, Milwaukee, USA) as the electrovibratography, and Jaw tracker(JT)-3 device in the BioPAK system (Bioresearch, Inc, Milwaukee, USA) to distinguish precisely tooth contact from joint sound. The aim of this study was to examime the TMJ sounds with repect to integral > 300㎐/<300㎐ ratio and frequency spectra pattern in subjects showing Disc displacement with reduction. This study was done using 30 individuals whose ages ranged from 23 to 33 years with a mean average of 26.2 years. Group 1 with 10 subjects had an absence of subjective TMJ complaints(noises and pains) while showing objective EVG findings. GroupⅡ with 20 subjects showed symptoms of disc displacement with reduction. In each subject EVG analyses were performed three times and the best performed recording was selected rom the three recordings. Prior to screening out vibrations showing highest amplitude tooth contact was excluded and reproducible joint sounds were analzed for each opening & closing cycle. Finally, the average episodes were recorded in each subject. Joint vibrations are analyzed using a mathematical technique known as the Fast Fourier Transform(FFT). The frequency spectra view plots amplitude(vertical axis) versus frequency(horizontal axis). The soft tissue vibrations generally have frequencies below 300㎐ and the hard tissues vibrations will generally have frequencies above 300㎐. With regard to the ratio between the integrals above and below 300㎐ which provide information on the relative distribution of high and low vibration frequencies, it is conceivable that the higher the integral >300㎐/<300㎐ ratio number, the more advanced degenerative condition could exist. In this study Gruop Ⅰ and Group Ⅱ, subdivision1 represented similar frequency spectrum patterns and showed a variable range of the integral >300㎐/<300㎐ ratios ranging from 0.04 to 0.3 and 0.05 to 0.31 respectively. While Group Ⅱ, subdivision1, 2 and 3 represented irregular energy patterns and showed relatively higher integral >300㎐/<300㎐ ratios. Since the clinical examination alone is not entirely accurate, an alternative cost-effective technique must be found. Through constant observations, it could be suggested that clinicians consider using this JVA protocol to differentiate the characteristics of TMJ sound. And JVA will provide the clinician with the visible patterns of TMJ sound for patient management.