Low-dose ionizing radiation increased lifespan and motility via the modulation of ROS level in Drosophila model

Haemin Jeong,Hwa Jin Jang,Seong-Jun Cho,Seon Young Nam 대한방사선방어학회 2018 대한방사선방어학회 학술발표회 논문요약집 Vol.2018 No.04

S-7 Differences in Minimal Hepatic Encephalopathy between ALC and viral LC

( Jeong Haemin ),( Ki Tae Suk ),( Dong Joon Kim ),( Chang Seok Bang ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1

Minimal hepatic encephalopathy (MHE) is a mild form of HE that is defined as an abnormality in cognitive function presenting abnormality in psychometric tests without clinical symptoms. Few data are available about cognitive function in patients with liver cirrhosis (LC) who had no history of HE. And the term of MHE is not considered etiologic factors that contribute to cognitive functions or brain damage. we can suppose that the degree of cognitive function impairment and its treatment may be different between alcoholic and viral compensated LC patients In this study, we evaluated the differences of the cognitive function of the two groups. From October 2011 to March 2013, 80 patients (virus:37 and alcohol:43) with compensated LC prospectively enrolled. Patients who have any history of overt HE, seizure, head trauma or stroke, dementia or who show any focal neurologic sign were excluded. We checked various neuropsychological factors of the selected patients, We used one psychometric test battery, Seoul Neuropsychological Screening Battery Second Edition; SNSB II (Human Brain Research & Consulting Co., Seoul, South Korea) that included all the tests described above.Concerning the statistical analysis, analysis of baseline characteristics was done by independent t-test, and neuropsycholgical test data analysis was done with analysis of covariance (ANCOVA) test. A p value <0.05 was considered significant for all tests. Education duration adjusted as a covariate (p=0.01). But age (p=0.531) and sex (p=0.122) were not adjusted as a covariate. We used statistical software, SPSS 18.0 (SPSS Inc., Chicago, Illinois, USA).The mean ages of patients with viral and alcoholic LC was 53.4±8.8 and 50.1±9.3 years, respectively. There were no significant differences in age, sex, education-period and laboratory findings except γ-GT (120.9±125.4 and 373.2±410.3 IU/L) and ALT (60.2±69.2 and 32.1±26.2 g/dL), between viral and alcoholic LC group, respectively. In results of the neuropsychological tests of patients,both alcohol and viral groups showed decreased memory and frontal/executive functions compared with age-matched normal data of the SNSB-II.

정렬오차 추정 필터에 기반한 비전 정렬 시스템의 고속 정밀제어

정해민(Haemin Jeong),황재웅(Jaewoong Hwang),권상주(SangJoo Kwon) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.12

In the flat panel display and semiconductor industries, the visual alignment system is considered as a core technology which determines the productivity of a manufacturing line. It consists of the vision system to extract the centroids of alignment marks and the stage control system to compensate the alignment error. In this paper, we develop a Kalman filter algorithm to estimate the alignment mark postures and propose a coarse-fine alignment control method which utilizes both original fine images and reduced coarse ones in the visual feedback. The error compensation trajectory for the distributed joint servos of the alignment stage is generated in terms of the inverse kinematic solution for the misalignment in task space. In constructing the estimation algorithm, the equation of motion for the alignment marks is given by using the forward kinematics of alignment stage. Secondly, the measurements for the alignment mark centroids are obtained from the reduced images by applying the geometric template matching. As a result, the proposed Kalman filter based coarse-fine alignment control method enables a considerable reduction of alignment time.

여유 구동 병렬기구를 이용한 마스크-패널 얼라인 로봇 시스템

정해민(Haemin Jeong),권상주(SangJoo Kwon),이상무(Sang Moo Lee) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.9

In this paper, a mask-panel alignment robot system is considered for IT industry applications. Two kinds of solutions are suggested which are required in constructing a control system for the alignment robot with actuation redundancy. First, the kinematic solution for the 4PPR parallel positioning mechanism is formulated for an arbitrary initial posture, which relates the mask-panel misalignment in the task space and the desired actuator displacements in the joint space. Secondly, in order to increase the stiffness of the control motion and also to avoid the mechanical lock which may happen due to the redundant actuation, a new synchronous control method is proposed which has the merit of coordinating joint control motions while not losing individual joint control performance. In addition, the engineering process to develop a visual alignment robot system is described with the results of experimental setup and GUT software. Finally, the experimental results demonstrate the effectiveness of the proposed alignment system control methodology and how much beneficial it will be in real industrial applications.

Virus-Directed Design of a Flexible BaTiO₃ Nanogenerator

Jeong, Chang Kyu,Kim, Insu,Park, Kwi-Il,Oh, Mi Hwa,Paik, Haemin,Hwang, Geon-Tae,No, Kwangsoo,Nam, Yoon Sung,Lee, Keon Jae American Chemical Society 2013 ACS NANO Vol.7 No.12

<P>Biotemplated synthesis of functional nanomaterials has received increasing attention for applications in energy, catalysis, bioimaging, and other technologies. This approach is justified by the unique abilities of biological systems to guide sophisticated assembly and organization of molecules and materials into distinctive nanoscale morphologies that exhibit physicochemical properties highly desirable for specific purposes. Here, we present a high-performance, flexible nanogenerator using anisotropic BaTiO<SUB>3</SUB> (BTO) nanocrystals synthesized on an M13 viral template through the genetically programmed self-assembly of metal ion precursors. The filamentous viral template realizes the formation of a highly entangled, well-dispersed network of anisotropic BTO nanostructures with high crystallinity and piezoelectricity. Even without the use of additional structural stabilizers, our virus-enabled flexible nanogenerator exhibits a high electrical output up to ∼300 nA and ∼6 V, indicating the importance of nanoscale structures for device performances. This study shows the biotemplating approach as a facile method to design and fabricate nanoscale materials particularly suitable for flexible energy harvesting applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-12/nn404659d/production/images/medium/nn-2013-04659d_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn404659d'>ACS Electronic Supporting Info</A></P>

Validation of Motor Imagery Guidance System for Stroke Patients using Virtual Hand Illusion

Hojun Jeong(정호준),Haemin Jung(정해민),Jonghyun Kim(김종현) 대한기계학회 2024 대한기계학회 춘추학술대회 Vol.2024 No.4

Control Strategy of Slack Enabling Tendon Actuator for the Soft Wearable Robot using Feedback Linearization

Useok Jeong,Haemin Lee,Hyunki In,Kyu-Jin Cho 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

Tendon driven mechanism has been widely used in mechanical systems because of its versatility to mechanical systems requiring complex transmission. This paper proposes a control strategy of slack enabling tendon actuator using feedback linearization. The slack enabling actuator is a newly developed tendon actuator that does not fail although the tendon slacks (non-positive tension) at the outlet of the actuator which is an essential operating phase when the tendon driven is applied to the soft wearable robots. To deal with the dynamic nonlinearities of the slack enabling actuator, input-output feedback linearization was adopted and linear disturbance observer was used to estimate the output tension of the wire and reject position following error due to the external load. The results show that the estimated tension coincide with the measured tension and a proposed method have proper characteristics to control the position of the tendon while estimating the tension of the output tendon.

A study of thermal decomposition of phases in cementitious systems using HT-XRD and TG

Song, Haemin,Jeong, Yeonung,Bae, Sungchul,Jun, Yubin,Yoon, Seyoon,Eun Oh, Jae Elsevier 2018 Construction and Building Materials Vol.169 No.-

<P><B>Abstract</B></P> <P>Significant variations have been reported on the temperature range of thermal decomposition of cementitious phases. Thus, this study identified temperature ranges on the phases in actual cementitious systems (portland cement (OPC) pastes, blended pastes of ground granulated blast furnace slag (GGBFS) with OPC, and Ca(OH)<SUB>2</SUB>-activated GGBFS) by simultaneously using thermogravimetry (TG) and high-temperature X-ray diffraction (HT-XRD) as follows: (1) 81°–91 °C for dehydration of ettringite, (2) ∼80°–240 °C for major dehydration of C-S-H, (3) ∼241°–244 °C for hydrogarnet, (4) ∼129°–138 °C for Al<SUB>2</SUB>O<SUB>3</SUB>-Fe<SUB>2</SUB>O<SUB>3</SUB>-mono phase (AFm), (5) ∼411°–427 °C for Ca(OH)<SUB>2</SUB>, and (6) ∼648°–691 °C for CaCO<SUB>3</SUB>. The CaO layers and SiO<SUB>2</SUB> chains of C-S-H likely started to decompose from 615°–630 °C, and eventually transformed to new crystalline phases. This study also demonstrated that (a) the quantity of calcite could be overestimated due to additional carbonation when Ca(OH)<SUB>2</SUB> is plentifully present in samples, and (b) the quantification of phases would be greatly affected by sample particle size when GGBFS is used in the system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study suggests correct decompositional temperatures of cementitious phases. </LI> <LI> DTG peaks of a phase can be affected by the presence of other phases. </LI> <LI> In TG, when Ca(OH)<SUB>2</SUB> plentifully exists, the weight of CaCO<SUB>3</SUB> can be overestimated. </LI> <LI> The gas type in TG (N<SUB>2</SUB> vs. air) had no significant influence on TG below 800 °C. </LI> <LI> Different heating rates and sample fineness can alter the TG results. </LI> </UL> </P>

Low-dose ionizing radiation alleviates Aβ42-induced defective phenotypes in Drosophila Alzheimer’s disease models

Soojin Hwang,Haemin Jeong,Seon Young Nam 대한방사선방어학회 2017 대한방사선방어학회 학술발표회 논문요약집 Vol.2017 No.04

Kalman Filter-Based Coarse-to-Fine Control for Display Visual Alignment Systems

SangJoo Kwon,Haemin Jeong,Jaewoong Hwang IEEE 2012 IEEE transactions on automation science and engine Vol.9 No.3

<P>A coarse-to-line two-stage control method is investigated for the display visual alignment systems. The proposed visual servo is with hierarchical loops, where the original line but slow vision loop is necessary for the exact localization of alignment marks while the coarse but fast vision loop of exploiting pruned image data is to compensate for the mask-panel misalignment. The degraded resolution of the reduced images is recovered in terms of the Kalman filter which tracks the mark centroids in near realtime. In order to construct the recursive estimation algorithm, the motion model for the moving alignment marks is determined by solving the forward kinematics of positioning mechanism and the measurements from vision sensors are given by means of the geometric template matching (Kwon and Hwang, “Kinematics, pattern recognition, and motion control of mask-panel alignment system,” Control Eng. Practice, vol. 19, pp. 883-892, 2011). Compared with the conventional alignment methods, this approach enables a fast and line alignment control. Experimental results are followed to validate the proposed control framework. Note to Practitioners-In order to successfully apply the developed alignment control to any display manufacturing equipment, it is necessary to well understand the principle of the geometric template matching (GTM) as an alignment mark specific fast algorithm, the details on which can be consulted in our preceding works (Kwon and Hwang, “Kinematics, pattern recognition, and motion control of mask-panel alignment system,” Control Eng. Practice, vol. 19, pp. 883-892, 2011). The new approach has the goal of updating the pose of an alignment mark as fast as the capturing rate of a frame grabber by utilizing pruned image data but recovering the lost resolution in terms of the Kalman filter. For example, in using a common 30 fps grabber, the reduced image of 320 240 pixels is a proper choice to finish the image processing and Kalman filtering within 30 ms under GTM. The proposed algorithm can be implemented in the current industrial display aligners by modifying the control software so that the reference inputs for the distributed joint servos follow the error compensation trajectory in Fig. 4 with the Kalman filter estimates.</P>