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Han, Junwon,Jeon, Byung Ho,Ryu, Chang Y.,Semler, James J.,Jhon, Young K.,Genzer, Jan WILEY-VCH Verlag 2009 Macromolecular Rapid Communications Vol.30 No.18
<P>Interaction chromatography has been employed to validate that adsorption of poly[styrene-co-(4-bromostyrene)] (PBr<SUB>x</SUB>S) random copolymers, where x denotes the mole fraction of 4-bromostyrene (4–BrS) in PBr<SUB>x</SUB>S in solution depends on the average number of adsorptive segments, the type of adsorbing substrate, and on the co-monomer sequence distribution in PBr<SUB>x</SUB>S.</P><P> <img src='wiley_img/10221336-2009-30-18-MARC200900282-gra001.gif' alt='wiley_img/10221336-2009-30-18-MARC200900282-gra001'> </P> <B>Graphic Abstract</B> <P>Interaction chromatography is used to detect monomer sequence distributions in A/B random copolymers by tailoring their adsorption inside a chromatographic column through variations of the solvent quality and the chemistry of the stationary phase. <img src='wiley_img/10221336-2009-30-18-MARC200900282-content.gif' alt='wiley_img/10221336-2009-30-18-MARC200900282-content'> </P>
The System for Designing the Experience Game of Smart Phone
James E. Brown,Kil-Dong Hong,Chul-Soo Han,Jung-Hwan Sung,Hyo-Houn No,Eui-Sang Oh 한국콘텐츠학회 2009 ICCC International Digital Design Invitation Exhib Vol.2009 No.12
This paper describes a game design system that is effective to design a game running on a smart phone. Firstly, for establishing the system, we define a clip as a concept diagram which represents overall configuration of smart phone game. Secondly, we divide smart phone game configuration into four parts; User interaction part, picture part, Scene control part, and operation element part and extract elements of the four parts from smart phone game. Then, we apply these elements to the iphone game application, "Slugger" and show how the four parts produce the analyzed model of certain scenario of the game. Finally, we introduce the simulation environment of the analyzed model.
A new approach to deal with sensor errors in structural controls with MR damper
Han Wang,Luyu Li,Gangbing Song,James B. Dabney,Thomas L. Harman 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.2
As commonly known, sensor errors and faulty signals may potentially lead structures in vibration to catastrophic failures. This paper presents a new approach to deal with sensor errors/faults in vibration control of structures by using the Fault detection and isolation (FDI) technique. To demonstrate the effectiveness of the approach, a space truss structure with semi-active devices such as Magneto-Rheological (MR) damper is used as an example. To address the problem, a Linear Matrix Inequality (LMI) based fixed-order H∞ FDI filter is introduced and designed. Modeling errors are treated as uncertainties in the FDI filter design to verify the robustness of the proposed FDI filter. Furthermore, an innovative Fuzzy Fault Tolerant Controller (FFTC) has been developed for this space truss structure model to preserve the pre-specified performance in the presence of sensor errors or faults. Simulation results have demonstrated that the proposed FDI filter is capable of detecting and isolating sensor errors/faults and actuator faults e.g., accelerometers and MR dampers, and the proposed FFTC can maintain the structural vibration suppression in faulty conditions.
James D. Baker,Garrett K. Harada,Youping Tao,Philip K. Louie,Bryce A. Basques,Fabio Galbusera,Frank Niemeyer,Hans-Joachim Wilke,Howard S. An,Dino Samartzis 대한척추신경외과학회 2020 Neurospine Vol.17 No.1
Objective: To assess the impact of Modic changes (MC) on preoperative symptoms, and postoperative outcomes in anterior cervical discectomy and fusion (ACDF) patients. Methods: We performed a retrospective study of prospectively collected data of ACDF patients at a single institution. Preoperative magnetic resonance imagings were used to assess the presence of MC. MC were stratified by type and location, and compared to patients without MC. Associations with symptoms, patient-reported measures, and surgical outcomes were assessed. Results: A total of 861 patients were included, with 356 patients with MC (41.3%). MC more frequently occurred at C5–6 (15.1%), and type II was the most common type (61.2%). MC were associated with advanced age (p<0.001), more levels fused (p<0.001), a longer duration of symptoms, but not with specific symptoms. MC at C7–T1 resulted in higher postoperative disability (p<0.001), but did not increase risk of adjacent segment degeneration or reoperation. Conclusion: This study is the first to systematically examine the impact of cervical MC, stratified by type and location, on outcomes in ACDF patients. Patients with MC were generally older, required larger fusions, and had longer duration of preoperative symptoms. While MC may not affect specific outcomes following ACDF, they may indicate a more debilitating preoperative state for patients.
Han, Yiwen,Kang, Wanmo,Thorne, James,Song, Youngkeun ELSEVIER SCIENCE B.V. AMSTERDAM 2019 URBAN FORESTRY AND URBAN GREENING Vol.41 No.-
<P><B>Abstract</B></P> <P>The fragmentation of natural habitats by urbanization often results in small and isolated remnants that lead to the degeneration of ecosystem services (ESs) and a loss of biodiversity. However, our understanding of the effects of landscape patterns on the provisioning of ESs in urban areas remains limited, as few studies have distinguished historical forest remnants (HFRs) from recently established habitats or have quantified changes in ESs due to HFRs. This study measured changes in the extent of forest ecosystems and the role played by HFRs in generating ESs in the human-dominated modernized landscape of Seoul, Republic of Korea. We use the spatial configuration of habitats to measure an index of habitat quality as an ES for a target conservation objective of general terrestrial biodiversity. Land-cover maps from two periods were used to identify 37 isolated patches within current parks with HFRs. Then landscape patterns and modeled habitat quality and habitat units (HUs) were quantified. Pearson correlation coefficients and forward stepwise multiple regression were used to examine the landscape metrics combined with HUs to explore key indicators that affect the HUs-value of HFRs. A 35.31% decline in total HUs was observed due to a significant decline in total forest area; however, the HUs of the HFRs increased by 0.5%. The shapes of current forests may positively affect the biodiversity of HFRs, whereas the area of newly formed habitats may negatively affect biodiversity in our modeling results. Thus, the careful design of newly formed habitats during city planning should include the preservation of historical remnants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The historical forest remnants within current forests habitats were identified at current parks. </LI> <LI> A joint analysis of changes of landscape pattern and habitat quality values was approached. </LI> <LI> The four key landscape metrics of current forests habitats played a significant role in affecting the habitat quality in historical forest remnants. </LI> <LI> The careful design of newly formed habitats during city planning should include the preservation of historical remnants. </LI> </UL> </P>
Han, Eun Ok,Kim, Jae Rok,Choi, Yoon Seok,Lochhead, James The Korean Association for Radiation Protection 2015 방사선방어학회지 Vol.40 No.3
To develop tailored elementary, middle, and high school textbooks suitable for understanding the nuclear energy and radiation, quantitative and qualitative research was carried out in parallel, which included nine steps to ensure the validity of content and structure. The elementary, middle, and high school students wanted to acquire information used in their daily lives, including the definition of nuclear energy and radiation, principles and status of nuclear power generation, and information about irradiated food, medical radiation, and radiation in life. In the evaluation of the effects of textbook contents according to the educational requirements of each school level, high suitability frequencies (>80%) were shown for the human character, education goals, curriculum goals, evaluation method, and education time. At some levels, the high suitability frequencies (>70%) were shown for the education grade, education type, and textbook type.
Han, Jeehoon,Luterbacher, Jeremy S.,Alonso, David Martin,Dumesic, James A.,Maravelias, Christos T. Elsevier 2015 Bioresource technology Vol.182 No.-
<P><B>Abstract</B></P> <P>The work develops a strategy for the production of ethanol from lignocellulosic biomass. In this strategy, the cellulose and hemicellulose fractions are simultaneously converted to sugars using a γ-valerolactone (GVL) solvent containing a dilute acid catalyst. To effectively recover GVL for reuse as solvent and biomass-derived lignin for heat and power generation, separation subsystems, including a novel CO<SUB>2</SUB>-based extraction for the separation of sugars from GVL, lignin and humins have been designed. The sugars are co-fermented by yeast to produce ethanol. Furthermore, heat integration to reduce utility requirements is performed. It is shown that this strategy leads to high ethanol yields and the total energy requirements could be satisfied by burning the lignin. The integrated strategy using corn stover feedstock leads to a minimum selling price of $5 per gallon of gasoline equivalent, which suggests that it is a promising alternative to current biofuels production approaches.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A process based on a new GVL-based biomass hydrolysis technology is studied. </LI> <LI> New separations for recovery of sugars, GVL, and lignin are developed. </LI> <LI> Separations are integrated with biomass-to-sugars and sugar-to-ethanol conversions. </LI> <LI> Proposed strategy is an attractive alternative to enzymatic lignocellulosic ethanol. </LI> <LI> Study identifies future research directions in conversions and separations. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>