Dynamic Grid Method for the Interface Design

Cheng,Hong In,Kim,Mi Young (사)한국디지털디자인협의회 2006 (사)한국디지털디자인협의회 conference Vol.2006 No.2

영화홍보 웹 사이트의 재미요소에 관한 감성공학적 분석

이경희,정홍인 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.S2 No.1

Usability has been regarded as the most significant principle at designing web sites. The 'Fun' elements causing fun emotion, however, can be more important for some web sites especially developed for specific purposes. Movie publicizing web sites contain various multimedia such as motion graphic, voice of actor and actress, interactive game inducing users to feel the 'Fun'. Eleven elements which induces the 'fun' feeling was extracted from the magazine jungle web sites and fifteen movie publicizing web sites were evaluated. The elements were then analyzed by using a questionnaire and web design guideline was suggested which might induce the 'Fun' feeling of web sites.

감성평가의 웹 디자인 적용에 관한 연구

김미영,정홍인 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.S2 No.2

New design method has been required for web designers to grasp the proper emotion, impression, and feeling of users evoked by visiting a web site and reflect these elements in web design. It is certain that such a new method can be a useful design tool, since web designers have only relied on their intuition and experience to induce users to perceive specific emotion of web sites. In this study, Kansei Engineering Type Ⅰ(Nagamachi 2002, Park 2000) was introduced to develop the methodology. The statistical methods and quantitative evaluation method using balance, overall density, and homogeneity were also introduced. The cause-and-effect between the results of emotional and quantitative analysis was examined by employing multiple regression and which could applied to the practical web design inducing specific emotion. The research method and procedures applied to this study would be applicable to design studies related to the emotional inducement.

Performance evaluation of soil-embedded plastic optical fiber sensors for geotechnical monitoring

Cheng-Cheng Zhang,Hong-Hu Zhu,Bin Shi,Jun-Kuan She,Dan Zhang 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.17 No.2

Based on the distributed fiber optic sensing (DFOS) technique, plastic optical fibers (POFs) are attractive candidates to measure deformations of geotechnical structures because they can withstand large strains before rupture. Understanding the mechanical interaction between an embedded POF and the surrounding soil or rock is a necessary step towards establishing an effective POF-based sensing system for geotechnical monitoring. This paper describes a first attempt to evaluate the feasibility of POF-based soil deformation monitoring considering the POF–soil interfacial properties. A series of pullout tests were performed under various confining pressures (CPs) on a jacketed polymethyl methacrylate (PMMA) POF embedded in soil specimens. The test results were interpreted using a fiber–soil interaction model, and were compared with previous test data of silica optical fibers (SOFs). The results showed that the range of CP in this study did not induce plastic deformation of the POF; therefore, the POF–soil and the SOF–soil interfaces had similar behavior. CP was found to play an important role in controlling the fiber–soil interfacial bond and the fiber measurement range. Moreover, an expression was formulated to determine whether a POF would undergo plastic deformation when measuring soil deformation. The plasticity of POF may influence the reliability of measurements, especially for monitored geo-structures whose deformation would alternately increase and decrease. Taken together, these results indicate that in terms of the interfacial parameters studied here the POF is feasible for monitoring soil deformation as long as the plastic deformation issue is carefully addressed.

Bending of a rectangular plate resting on a fractionalized Zener foundation

Cheng-Cheng Zhang,Hong-Hu Zhu,Bin Shi,Guo-Xiong Mei 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.6

The long-term performance of plates resting on viscoelastic foundations is a major concern in the analysis of soil-structure interaction. As a powerful mathematical tool, fractional calculus may address these plate-on-foundation problems. In this paper, a fractionalized Zener model is proposed to study the time-dependent behavior of a uniformly loaded rectangular thin foundation plate. By use of the viscoelasticelastic correspondence principle and the Laplace transforms, the analytical solutions were obtained in termsof the Mittag-Leffler function. Through the analysis of a numerical example, the calculated plate deflection, bending moment and foundation reaction were compared to those from ideal elastic and standard viscoelastic models. It is found that the upper and lower bound solutions of the plate response estimated by the proposed model can be determined using the elastic model. Based on a parametric study, the impacts of model parameters on the long-term performance of a foundation plate were systematically investigated. The results show that the two spring stiffnesses govern the upper and lower bound solutions of the plate response. By varying the values of the fractional differential order and the coefficient of viscosity, the timedependent behavior of a foundation plate can be accurately captured. The fractional differential order seems to be dependent on the mechanical properties of the ground soil. A sandy foundation will have a small fractional differential order while in order to simulate the creeping of clay foundation, a larger fractional differential order value is needed. The fractionalized Zener model is capable of accounting for the primary and secondary consolidation processes of the foundation soil and can be used to predict the plateperformance over many decades of time.

Visualization of Peripheral Pulmonary Artery Red Thrombi Utilizing Optical Coherence Tomography

Cheng Hong,Wei Wang,Nan-shan Zhong,Guang-qiao Zeng,Nuo-fu Zhang 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.5

Optical coherence tomography (OCT) is a new imaging technique capable of obtaining high-resolution intravascular images and has been used in interventional cardiology. However, an application of OCT in pulmonary arteries had seldom been documented. In this case, OCT imaging is performed in peripheral pulmonary arteries and shows mural red thrombi. Subsequently, the red thrombi are aspirated and confirmed by a histological examination. These findings suggest that OCT may be a useful tool to depict peripheral pulmonary artery thrombi.

Coil-based Electromagnetic Damper and Actuator for Vibration Suppression of Cantilever Beams

Cheng, Tai-Hong,Oh, Il-Kwon SAGE Publications 2009 Journal of intelligent material systems and struct Vol.20 No.18

<P>In this study, both an eddy current coil damper and an electromagnetic actuator were developed for the vibration suppression of a cantilever beam integrated with a copper coil and a permanent magnet. The control system for the vibration suppression of the electro-magneto-mechanically coupled beam that consists of a coil attached to an aluminum beam and a permanent magnet installed below the coil was proposed. Alternatively, the conductive coil can be passively and actively used as a damper and an actuator. The effects of various coil shapes including a cylindrical tube, a square tube and a circular sheet were investigated to determine optimal vibration suppression for the cantilever beam. The frequency response function of a beam with the theoretical model of the magnetic eddy current damping system was predicted and its accuracy was compared to the experimentally measured frequency response. Also, the results of the active control with a positive position feedback method were compared with those of the passive eddy current dampers with open and closed circuits. The experimental data showed that the tube type coils had much higher vibration suppression efficiency than the sheet type coil and the active vibration control strategy can be alternatively used to improve the electromagnetic damper system.</P>

Attenuation of hyperoxic acute lung injury by Lycium barbarum polysaccharide via inhibiting NLRP3 inflammasome

Cheng-Ying Hong,Hua-Dong Zhang,Xue-Yan Liu,Yong Xu 대한약학회 2019 Archives of Pharmacal Research Vol.42 No.10

Lycium barbarum polysaccharide (LBP), anactive component from Goji berry which is a traditionalChinese medicine, has anti-inflammatory and antioxidantfeatures. The aim of our study was to investigate whetherLBP has any role in hyperoxia-induced acute lung injury(ALI). Using a murine model of hyperoxia-induced ALI,we investigate the effect of LBP on pulmonary pathologicalchanges as well as Sirtuin 1 (SIRT1) and the nucleotidebinding domain and leucine-rich repeat pyrin domaincontaining 3 (NLRP3) inflammasome. Exposure to 100%oxygen for 72 h in male C57BL/6 mice resulted inincreased protein levels of tumor necrosis factor-a andinterleukin-1b in lung tissues, and aggravated lung histologicalalterations. These hyperoxia-induced changes andmortality were improved by LBP. LBP markedly suppressedthe activation of NLRP3 inflammasome bothin vivo and in vitro. Moreover, LBP upregulated SIRT1expression compared with vehicle-treated group. Importantly,knockdown of SIRT1 reversed the inhibitory effectof LBP on NLRP3 inflammasome activation in vitro. LBP meliorated hyperoxia-induced ALI in mice by SIRT1-dependentinhibition of NLRP3 inflammasome activation.

Electric and magnetic field-responsive suspension rheology of core/shell-shaped iron oxide/polyindole microspheres

Cheng Hai Hong,장효선,오석준,Fu Li-hai,최형진 한국유변학회 2023 Korea-Australia rheology journal Vol.35 No.2

In this study, conductive polyindole (PIn) was coated onto initially fabricated magnetic iron oxide ( Fe3O4) particles via chemical oxidative polymerization, and the synthesized core–shell structured hybrid smart particles were used as smart electrorheological/magnetorheological (EMR) materials. The synthesized Fe3O4/ PIn particles were characterized using scanning electron microscopy and transmission electron microscopy. In addition, the chemical composition of the synthesized particles was confirmed using Fourier-transform infrared spectroscopy. Their magnetic properties were further analyzed using VSM. Consequently, the Fe3O4/ PIn particle-based suspension, which was both magnetic and conductive, was found to exhibit interesting dual stimuli under both external electric and magnetic fields. Various rheological measurements, including shear simple steady shear and dynamic tests, were employed to evaluate the behavior of typical EMR suspensions. Furthermore, the dielectric properties of the particles were analyzed using an LCR meter. Based on the dielectric spectrum data, the relaxation time (λ) was estimated to be 1.5 × 10– 8 s at the maximum frequency (λ = 1/2πfmax). Measurements conducted using a Turbiscan indicated enhanced sedimentation stability of the particles owing to a decrease in the particle density from 4.34 to 2.93 g/cm3.

Responses of Plasma IGF-1, IGFBPs and Hepatic GH Receptor to Growth Hormone Releasing Peptides (GHRP)-2 Administration and Energy Level in Wethers

Hong Gu Lee(이홍구),Young Cheng Jin(김영성),Hisashi Hidari,Yun Jaie Choi(최윤재),Seon Ku Kim(김선구),Teak Soon Shin(신택순),Byung Uuk Cho(조병욱),Yong Gyun Kim(김용균),Keun Ki Kim(김근기),Hong Joo Son(손홍주),Sang Mong Lee(이상몽) 한국생명과학회 2008 생명과학회지 Vol.18 No.7

본 연구는 정상으로 단백질을 급여한 거세면양에 있어서 에너지 첨가가 GHRP-2투여에 대한 혈장 IGF-1 및 IGFBPs에 대한 반응과, 고에너지 급여에 따른 GHRP-2투여가 hepatic GH 수용체에 미치는 영향을 검증하기 위하여 실시하였다. 시험 결과 HENP (CP 0.34 ㎏, TDN 1.83 ㎏/day DM intake)처리기간 동안 혈장 IGF-1 과 39-42kDa IGFBP-3수준은 LENP (CP 0.32 ㎏, TDN 0.87 ㎏/day DM intake)기간에 비하여 높게 나타났으나 (P<0.05), 혈장 34 kDa IGFBP-2와 24 kDa IGFBP-4는 영양처리에 의해 영향을 받지 않았다. 각 영양처리 기간동안 GHRP-2 (12.5 μg/㎏ body weight/day)투여는 혈장 GH 반응이 촉진되었으며(P<0.05), 혈장 GH 평균 함량과 AUC증가에 있어서는 LENP처리 기간에 비하여 HENP처리기간에서 유의적으로 높게 나타났다(P<0.01). 특히 HENP에서 7일간 GHRP-2투여에 의한 일중 혈장 IGF-1 변화양상을 조사한 결과 투여 2, 6 및 7일에서 뚜렷한 증가양상을 보였다(P<0.05). 이에 반하여 LENP에서는 오직 투여 3일째에서 Saline구에 비하여 유의적인 증가를 확인하였다(P<0.05). IGFBPs의 ligand blotting 결과 HENP구에서 혈장 39-43 kDa IGFBP-3의 수준의 증가가 투여 6일과 7일에서 관찰되었으나 혈장 IGFBP-2수준은 두 영양처리시기에서 유의적인 차이를 관찰하지 못했다. 아울러 HENP구에 있어서 간세포막에 <SUP>125</SUP>I-oGH의 결합력을 측정한 결과 GHRP-2투여에 의한 영향은 관찰되지 않았다. 이와 같은 결과는 거세면양에 있어서 단백질과 에너지 사이의 영양적 균형은 내인성 GH/IGF-1 axis는 물론 혈장 IGFBP-3수준의 변화에 영향을 미치고 있음을 시사한다. The purpose of this study was to determine the effect of energy supplement on responses of plasma insulin-like growth factor (IGF)-1 and IGF binding proteins (IGFBPs) to growth hormone-releasing peptide-2 (GHRP-2) administration in normal protein-fed wethers, and to observe the effect of GHRP-2 treatment on hepatic growth hormone (GH) receptor in well-fed wethers. Plasma IGF-1 and 39-42 kDa IGFBP-3 during the HENP (CP, crude protein 0.34 and TDN, total digestible nutrients 1.83 ㎏/day DM, dry matter intake) treatment period were higher than in the LENP (CP 0.32 ㎏ and TDN 0.87 ㎏/day DM intake) period (P<0.05). The response of GH was stimulated by GHRP-2 (12.5 ㎍/㎏ body weight/day) administration during both of the feed treatment periods (P<0.05). The area under curve (AUC) increment and average concentration of GH (0-180 min) with GHRP-2 administration was higher during HENP treatment than LENP treatment (P<0.01). During the HENP treatment period from day 1 to day 7 of twice daily GHRP-2 treatment, the plasma IGF-1 increment was increased on days 2, 6 and 7 of GHRP-2 administration (P<0.05). On the basis of ligand blotting, the proportions of plasma 39-43 kDa IGFBP-3 during the HENP treatment period only showed a significant difference on days 6 and 7 with GHRP-2 administration. No significant difference in the specific binding of 125I-labeled oGH to hepatic membranes was detected between the saline and GHRP-2 treatments of the HENP-fed wethers. These results suggest that the nutritional balance between energy and protein may affect the endogenous GH / IGF-1 axis as well as plasma IGFBP-3 levels.