Surface-Initiated ARGET ATRP of Antifouling Zwitterionic Brushes Using Versatile and Uniform Initiator Film

Jeong, Wonwoo,Kang, Hyeongeun,Kim, Eunseok,Jeong, Jaehoon,Hong, Daewha American Chemical Society 2019 Langmuir Vol.35 No.41

<P>In this study, we developed a uniform initiator layer that can be formed on various surfaces, and formed site-selectively, for the subsequent antifouling polymer brush formation. Initially, metal-organic films composed of tannic acid (TA) and Fe<SUP>III</SUP> ions (TA-Fe<SUP>III</SUP>) were formed on various surfaces, followed by functionalization with an aryl azide-based initiator (ABI) under photoreaction. In particular, combination with a photolithographic technique enabled the presentation of initiators only on the intended region within a single-surface platform. A resultant initiator film (TF-ABI) was formed under mild reaction conditions and meets the uniformity and transparency requirements concurrently. Subsequently, we showed that TF-ABI can be further utilized to form a polymer brush by proceeding with surface-initiated polymerization using a zwitterionic monomer, namely, sulfobetaine acrylamide (SBAA). Instead of applying a classical, yet air-sensitive atom transfer radical polymerization (ATRP) technique, we utilized an activator regenerated by electron transfer (ARGET) ATRP under air conditions without a cumbersome deoxygenation step. Overall, our initiator layer allowed the antifouling poly(SBAA) brush to be used on various surfaces, and enabled their pattern generation.</P> [FIG OMISSION]</BR>

Low field magnetic resonance imaging characteristics of experimental canine intracranial hemorrhage

Jeong, Jimo,Jung, Yechan,Jeong, Eunseok,Cho, Youngkwon,Lee, Kichang PAKISTAN VETERINARY JOURNAL 2017 Pakistan veterinary journal Vol.37 No.3

A Bio-Inspired System to Detect String Vibration

Eunseok Jeong,DaeEun Kim 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10

Finger-gesture Recognition Glove using Velostat (ICCAS 2011)

Eunseok Jeong,Jaehong Lee,DaeEun Kim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10

There are many researches into sign language translation by finger-gesture recognition. Recognition technic of finger alphabet can be a substitute for the deaf that are unable to use sound recognition devices instead of computer input devices. This paper is about the development of the finger-gesture recognition glove that recognizes sign language with a use of inexpensive and conductive materials. This material is called by ‘Velostat’, made of a film surfaced with carbon particles, used for anti-static package of electronic parts. Its resistance varies according to the strain of the film. So, we made a glove using Velostat and designed electronic circuits that have voltage on circuit, A/D converter, microcomputer, Bluetooth module and 5-DoF IMU (Inertial Measurement Unit). It can measure the five fingers’ bending angle from voltage divided circuit with Velostat glove and calculate the hand motion angle from 5-DoF IMU.

사막 전갈의 진동 감지 행동을 모델로 한 진원지 방향 추정 기법

정은석(Eunseok Jeong),김대은(DaeEun Kim) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.10

Sand scorpions are nocturnal animals to mostly use tactile senses to detect their prey. It has been reported that sand scorpions have high vibration sensitivity for their prey-localizing behavior. We tested vibration experiments in the sand with microphone sensors to model the sand scorpion’s behavior and a time-difference model was applied to find the direction of a vibration source. Using the information of the arrival time of the vibration signal to reach each leg position, we can find the location of the vibration source.

실직이 자아존중감에 미치는 영향: 성별 차이를 중심으로

정은석 ( Jeong Eunseok ),강상경 ( Kahng Sang Kyoung ) 한국보건사회연구원 2015 保健社會硏究 Vol.35 No.1

기존연구는 자존감 수준이 성별과 취업여부에 따라서 차이가 있다는 것을 보여준다. 하지만 직업상황변화와 자존감의 관계에 대한 실증연구가 거의 없어서, 취업자가 실직을 당했을 때 자존감이 어떻게 변화하는지, 또한 실직에 따른 자존감 변화가 성별에 따라서 다른지에 대해서는 알려진 바가 없다. 이러한 한계를 염두에 두고 본 연구는 경제활동인구 중 취업자를 대상으로 (1) 자존감이 성별에 따라 차이가 있는지, (2) 실직자와 취업유지자의 자존감 차이가 있는지, (3) 실직에 따른 자존감 차이가 성별에 따라 상이한지를 살펴보고자 한다. 분석 데이터는 한국복지패널 7차 년도와 8차 년도 자료이고, 연구대상은 7차 년도 기준으로 취업중인 경제활동인구 5,387명(남: 3,044명, 여: 2,343명)이다. 분석은 8차 년도 자존감을 종속변수로, 7차 년도 자존감을 통제한 상태에서 성별, 실직 여부, 성별과 실직의 상호작용효과를 검증하는 회귀분석을 하였다. 주요 분석결과는 다음과 같다. (1) 취업자 사이에서는 여성이 남성보다 자존감이 높았고, (2) 실직자가 취업유지자에 비해 자존감이 낮았으며, (3) 남성 실직 경험자의 자존감이 여성 실직 경험자의 자존감보다 유의미하게 낮았다. 이러한 결과를 바탕으로 연구결과의 함의 및 향후 연구방향에 대해서 논의 하였다. Previous research indicates that self-esteem tends to vary by both gender and employment status. As few studies empirically tested the relationships between job loss and self-esteem, however, little is known about the effects of job loss on self-esteem. Much less is known about whether the effects of job loss on self-esteem vary by gender. In order to address the gaps in previous research, the current study aims to examine whether the effects of job loss on self-esteem vary by gender through testing (1) whether self-esteem varies by gender, (2) whether the effect of job loss on self-esteem is significant, and (3) whether the effects of job loss on self-esteem vary by gender. We used data from both 7th and 8th waves of the Korean Welfare Panel Study. Sample consists of 5,387(males: 3,044 and females: 2,343) individuals in labor force population as of 7th wave. Controlling for self-esteem in Wave 7, regression analyses were done not only to examine the main effects of both gender and job loss but also the interaction effects between gender and job loss on self-esteem in Wave 8. Major findings are as follows. (1) Females presented higher levels of self-esteem than males. (2) Those who were continuously employed presented higher levels of self-esteem than those who lost their jobs. (3) The effects of job loss on self-esteem varied by gender, indicating males who lost their jobs presented much lower levels of self-esteem than their female counterparts. Based on these findings, implications and future research directions are discussed.

Time-dependent low-field MRI characteristics of canine blood: an in vitro study

Jimo Jeong,Sangjun Park,Eunseok Jeong,Namsoo Kim,Min Su Kim,Yechan Jung,Youngkwon Cho,Kichang Lee 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.1

The present study was conducted to assess time-sensitive magnetic resonance (MR) changes in canine blood using low-field MR. Arterial and venous blood samples were collected from eight healthy beagle dogs. Samples were placed in 5-mL tubes and imaged within 3 hours of collection at 1 day intervals from day 1 to day 30. The following sequences were used: T1-weighted (T1W), T2-weighted (T2W), fluid-attenuated inversion recovery (FLAIR), short tau inversion recovery (STIR), and T2-star gradient-echo (T2*-GRE). Visual comparison of the images revealed that four relatively homogenous blood clots and twelve heterogeneous blood clots developed. The margination of the clot and plasma changed significantly on day 2 and day 13. On day 2, heterogeneous blood clots were differentiated into 2 to 3 signal layers in the T2W, T1W, and especially the STIR images. Hypointense signal layers were also detected in the blood clots in STIR images, which have T2 hypo, FLAIR hypo, and T1 hyper intense signals. In all images, these signal layers remained relatively unchanged until day 13. Overall, the results suggest that hematomas are complex on low-field MRI. Accordingly, it may not be feasible to accurately characterize hemorrhages and predict clot age based on low-field MRI.

진동감지를 이용한 사용자 걸음걸이 인식

정은석(Eunseok Jeong),김대은(DaeEun Kim) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.5

In service robots, a number of human movements are analyzed using a variety of sensors. Vibration signals from walking movements of a human provide useful information about the distance and the movement direction of the human. In this paper, we measure the intensity of vibrations and detect both human walking pace and direction. In our experiments, vibration signals detected by microphone sensors provide good estimation of the distance and direction of a human movement. This can be applied to HRI (Human-Robot Interaction) technology.

DSRC 기반 적응형 지능 내비게이션 시스템

정호현(Hohyeon Jeong),이정원(Jung-Won Lee),정재훈(Jaehoon Paul Jeong),이은석(Eunseok Lee) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.2

본 논문에서는 교통상황을 실시간으로 반영하여 최적의 이동경로를 제공하는 적응형 내비게이션 시스템을 제안한다. 본 시스템은 세 가지 요소로 구성되어있다. 첫 번째로 도로교통망 중 한 구획의 도로상황정보를 수집하고 공유하는 Traffic Control Center (TCC). 두 번째로 개별적인 도로나 교차로에 설치되어 차량으로부터 도로상황정보를 수집하는 Road Side Unit(RSU). 마지막으로 차량들 간의 망 형성을 위해서 사용되는 Dedicated Short Range Communications(DSRC)를 기반으로 차량에 설치된 단말기가 있다. DSRC를 기반으로 RSU와의 통신하는 단말기는 실시간 도로교통정보를 기반으로 운전자에게 최적의 경로를 제공한다. 이동속도와 같은 교통정보는 단말기에서 측정되고, RSU로 전송된다. RSU는 이 정보를 처리하여 해당 도로의 도로상황지수를 생성하고, 주기적으로 TCC에 전송한다. TCC는 RSU로부터 도로상황지수를 통합하여 TCC의 관할 구획의 모든 차량에 대해 도로교통정보를 만든다. 마지막으로 단말기는 효율적인 경로안내를 위해 최적의 경로를 도출하여 운전자에게 제공한다. 따라서 단말기, RSU, TCC간의 상호작용을 통해 AINS는 동적인 교통상황(정체, 교통사고 등)을 기반으로 새로운 형태의 적응형 지능 내비게이션을 제공할 수 있다.

Case Report of Spontaneous Malignant Lymphoma in a SD Rat

Eunseok Auh,Euna Kwon,Hyoung-Jin Kim,Jeong-Hwan Che,Byeong-Cheol Kang 한국실험동물학회 2012 한국실험동물학회 학술발표대회 논문집 Vol.2012 No.8