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Maximizing biomass utilization: An integrated strategy for coproducing multiple chemicals

journal of Energy Chemistry 2025年第1期100卷 180-191页

作者： Byeongchan Ahn Sua jo jonggeol Na j.jay Liu Young-ju kim Wangyun Won Department of Chemical and Biological Engineering Korea University Department of Chemical Engineering (Integrated process) Kyung Hee University Department of Chemical Engineering and Materials Science Ewha Womans University Department of Chemical Engineering Pukyong National University Resources Engineering Plant Research Department Korea Institute of Geoscience and Mineral Resources

Lignocellulosic biomass is one of the viable solutions to alleviate the global warming. However, the limited utilization of biomass majorly focused on cellulose and hemicellulose restricts the economic and environmental feasibilities. To cope with this issue, we proposed an integrated process of co-producing 1,6-hexanediol（1,6-HDO） with tetrahydrofuran and adipic acid from biomass, referred to as Strategy A. To compare the impacts of lignin upgrading and feedstock, Strategy B, which co-produces tetrahydrofuran alone, and Strategy C, which is the traditional route to produce 1,6-HDO from fossil fuels, were used. Heat networks are also designed to reduce operating costs and indirect carbon emissions due to energy consumption, saving 87% and 83% of the heat and cooling requirements, respectively, in Strategy A. The market competitiveness of Strategy A was evaluated by determining the minimum selling price through techno-economic analysis, and sustainability was thoroughly investigated by quantifying the environmental impacts through both midpoint and endpoint life-cycle assessments（LCAs）.Strategy A was found to be the most favorable both economically（USRDSCHARDOLLAR3,402/ton） and environmentally（-26.9 kg CO2eq.）. This indicates that lignin valorization is not only economically but also environmentally preferred. Finally, changes in economic and environmental feasibilities depending on economic, process, and environmental parameters were investigated using sensitivity and uncertainty analyses. The results of these analyses provide valuable insight into bio-based chemical production.

关键词： Biorefinery Carbon mitigation Climate change Global warming Lignin utilization Bioeconomy

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Characterization of Ceramic Composite-Membranes Prepared by ORMOSIL Coating Sol

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journal of Rare Earths 2004年第Z2期22卷 136-140页

作者： Goo-Dae kim Tae-bong kim School of New Materials Science and Engineering Yonsei UniversitySeoul 120-749Korea Division of MaterialsKorea Institute Science and TechnologySeoul 136-791Korea

Sol-gel methods offer many advantages over conventional slip-casting, including the ability to produce ceramic membranes. They are purer, more homogeneous, more reactive and contain a wider variety of compositions. We produced ormosil sol using sol-gel process under different molecular weight of polymer species [polyethylene glycol (PEG) ] in total system [Tetraethyl ortho silicate(TEOS)-polyethylene glycol (PEG)]. The properties of as-prepared ormosil sol such as,viscosity, gelation time were characterized. Also, the ceramic membrane was prepared by dip-coating with synthetic sol and its micro-structure was observed by scanning electron microscopy. The permeability and rejection efficiency of membrane for oil/water emulsion were evaluated as cross-flow apparatus. The ormosil sol coated Membrane is easily formed by steric effect of polymer and it improves flux efficiency because infiltration into porous support decreased. Its flux efficiency is elevated about 200(1/m2·h) compared with colloidal sol coated membrane at point of five minutes from starting test.

关键词： ORMOSIL sol crack Resistance ultra-filter micro-filter

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Integrated guidance and control for damping augmented system via convex optimization

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Chinese journal of Aeronautics 2022年第7期35卷 30-39页

作者： bong-Gyun PARK Tae-Hun kim The 1^(st)R&D Institute-4 Agency for Defense DevelopmentDaejeon 34186Republic of Korea

In this paper,an integrated guidance and control approach is presented to improve the performance of the missile *** approach includes damping augmented system with attitude rate feedback to decrease the oscillation during the homing phase for missiles with low *** addition,physical constraints,which can affect the performance of the missile interception,such as acceleration limit,seeker’s look angle,and look angle rate constraints are *** integrated guidance and control problem is formulated as a convex quadratic optimization problem with equality and inequality constraints,and the solution is obtained by a primal–dual interior point *** performance of the proposed method is verified through several numerical examples.

关键词： Convex optimization Damping augmented system Integrated guidance and control Physical constraint Primal-dual interior point method

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Globus pharyngeus:A review of its etiology,diagnosis and treatment

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World journal of Gastroenterology 2012年第20期18卷 2462-2471页

作者： bong Eun Lee Gwang Ha kim Department of Internal Medi cine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University Hospital Busan 602-739South Korea

Globus is a persistent or intermittent non-painful sensation of a lump or foreign body in the *** is a commonly encountered clinical condition that is usually long-lasting,difficult to treat,and has a tendency to ***,due to the uncertain etiology of globus,it remains difficult to establish standard investigation and treatment strategies for affected patients. As a first step for managing globus,careful history taking and nasolaryngoscopy are *** the benign nature of the condition and the recent notion that gastroesophageal reflux disease is a major cause of globus,empirical therapy with a high dose of proton pump inhibitors is reasonable for patients with typical *** patients are nonresponsive to this therapy, definitive assessments such as endoscopy,multichannel intraluminal impedance/pH monitoring,and ma-nometry should be *** and language therapy,anti-depressants,and cognitive-behavioral therapy can be helpful in patients whose symptoms persist despite negative investigations.

关键词： Diagnosis Gastroesophageal reflux disease Globus Proton pump inhibitor Treatment

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Evaluation of the performance of a soft X-ray charger for the bipolar charging of nanoparticles

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Particuology 2015年第1期13卷 165-169页

作者： Young Hun Yoon Choonkeun bong Dae Seong kim Department of Integrated Environmental Systems Pyeongtaek University GreenSolus Co. Global Frontier Center for Multiscale Energy Systems Seoul National University

The use of soft X-rays in a neutralizer represents an alternative technique that could replace conventional radioactive sources. In this study, we evaluated the charging characteristics of a soft X-ray aerosol neu- tralizer. In addition, the results from the evaluation of the soft X-ray charger were compared with results obtained using a neutralizer incorporating an 241 Am radioactive source. The tandem differential mobility analyzer technique was used previously to determine the size-dependent positive, negative, and neutral charge fractions of a soft X-ray neutralizer. This technique was used to show that the neutral fractions obtained using the soft X-ray charger agreed well with the predictions of bipolar diffusion charging the- ory, and that the soft X-ray charger could be used as a neutralizer for a scanning mobility particle sizer system.

关键词： Soft X-ray Neutralizer Bipolar charger Nanoparticle TDMA

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Risk factors for immediate post-operative fatal recurrence after curative resection of hepatocellular carcinoma

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World journal of Gastroenterology 2006年第1期12卷 99-104页

作者： bong-Wan kim Young-Bae kim Hee-jung Wang Myung-Wook kim Department of Surgery Ajou University School of MedicineWonchon dongYoungtong kuSuwonKyounggi ProvinceSouth Korea Department of Pathology Ajou University School of Medicine.Wonchon dongYoungtong kuSuwonKyounggi ProvinceSouth Korea

AIM： To investigate the clinicopathological risk factors for immediate post-operative fatal recurrence of hepatocellular carcinoma （HCC）, which may have practical implication and contribute to establishing high risk patients for pre- or post-operative preventive measures against HCC recurrence. METHODS： From june 1994 to May 2004, 269 patients who received curative resection for HCC were reviewed. Of these patients, those who demonstrated diffuse intrahepatic or multiple systemic recurrent lesions within 6 mo after surgery were investigated （fatal recurrence group）. The remaining patients were designated as the control group, and the two groups were compared for clinicopathologic risk factors. RESULTS： Among the 269 patients reviewed, 30 patients were enrolled in the fatal recurrence group. Among the latter, 20 patients showed diffuse intrahepatic recurrence type and 10 showed multiple systemic recurrence type. Multivariate analysis between the fatal recurrence group and control group showed that preoperative serum alpha-fetoprotein （AFP） level was greater than 1 000 μg/L （P= 0.02; odds ratio = 2.98）, tumor size greater than 6.5 cm （P= 0.03; OR= 2.98）, and presence of microvascular invasion （P= 0.01; OR=4.89） were the risk factors in the fatal recurrence group. The 48.1% of the patients who had all the three risk factors and the 220 of those who had two risk factors experienced fatal recurrence within 6 mo after surgery. CONCLUSION： Three distinct risk factors for immediate post-operative fatal recurrence of HCC after curative resection are pre-operative serum AFP level 〉 1 000 μg/L,tumor size〉6.5 cm, and microvascular invasion. The high risk patients with two or more risk factors should be the candidates for various adjuvant clinical trials.

关键词： Hepatocellular carcinoma Hepatectomy Early recurrence Risk factors

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Anodic-biased titania nanotube growth in low-dielectric viscous media

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International journal of Smart and Nano Materials 2013年第1期4卷 47-54页

作者： bong june Zhang Kwang jin kim Low Carbon Green Technology Laboratory Department of Mechanical Engineering(MS312)University of NevadaRenoNV 89557USA

The influence was investigated of aqueous electrolytes and organic-based electrolytes on nanopore *** create well-defined nanotubes with a high aspect ratio,it is important to maintain equilibrium between field-assisted metal oxide dissolution and field-assisted water dissociation,which influence the temperature and pH levels in TiO_(2) nanotubes(TiO_(2) NTs).This sought after balance in the net reactions of the TiO_(2) NT growth can be achieved by choosing the appropriate electrolytes that are a relatively low dielectric viscous ***(η)and dielectrics(ε)can be a priority in designing the experiment since it is closely related to joule-heating,diffusion-driven metal ions dissolution and chemical etching of the metal *** and the hydrogen bonding ability are inter-correlated to the stability of the[TiF_(6)]^(2-) *** order to examine various electrolyte effects on the anodic-biased nanotube,different categories of electrolytes,each with different viscosity and dielectric properties,were incorporated in this study.

关键词： nanoporous material titanium dioxide nanotube thin film anodizing

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Calculation of optimal current density of double side permanent magnet linear synchronous motor

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journal of Central South University 2011年第1期18卷 165-170页

作者： jANG Ki-bong AN Ho-jin kim Gyu-Tak School of Mechatronics Changwon National University

The use of design method considering a coil temperature to maximize the thrust density of a double side coreless permanent magnet linear synchronous motor(PMLSM) was *** optimal current density where the coil temperature reaches an allowable temperature with heat analysis was applied to a magnetic circuit *** optimal current density is verified whenever the design parameters of the motor are *** design parameters of the motor were applied to thrust *** this way,the optimal model,which is a reversal of the existing design method,is *** results were compared with the experimental data to verify their *** the convection heat transfer coefficient is applied to other models,the results of the analysis and test values show good *** method proposed has some limitations.

关键词： permanent magnet linear synchronous motor current density heat transfer temperature thickness of coil

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Design study of a radio-frequency quadrupole for high-intensity beams

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Chinese Physics C 2017年第7期41卷 142-150页

作者： jungbae Bahng Eun-San kim bong-Hyuk Choi Department of Physics Kyungpook National University Daegu 41566 Republic of Korea Department of Accelerator Science Graduate School Korea University Sejong campus Sejong 30019 Republic of Korea Institute for Basic Science Daejeon 34047 Republic of Korea

The Rare isotope Accelerator Of Newness（RAON） heavy-ion accelerator has been designed for the Rare Isotope Science Project（RISP） in Korea. The RAON will produce heavy-ion beams from 660-MeV-proton to200-MeV/u-uranium with continuous wave（CW） power of 400 k W to support research in various scientific *** system consists of an ECR ion source, LEBTs with 10 ke V/u, CW RFQ accelerator with 81.25 MHz and 500 ke V/u, a MEBT system, and a SC linac. In detail, the driver linac system consists of a Quarter Wave Resonator（QWR） section with 81.25 MHz and a Half Wave Resonator（HWR） section with 162.5 MHz, Linac-1, and a Spoke Cavity section with 325 MHz, Linac-2. These linacs have been designed to optimize the beam parameters to meet the required design goals. At the same time, a light-heavy ion accelerator with high-intensity beam, such as proton,deuteron, and helium beams, is required for experiments. In this paper, we present the design study of the high intensity RFQ for a deuteron beam with energies from 30 ke V/u to 1.5 MeV/u and currents in the m A range. This system is composed of an Penning Ionization Gauge ion source, short LEBT with a RF deflector, and shared SC Linac. In order to increase acceleration efficiency in a short length with low cost, the 2nd harmonic of 162.5 MHz is applied as the operation frequency in the D^＋RFQ design. The D^＋RFQ is designed with 4.97 m, 1.52 bravery factor. Since it operates with 2nd harmonic frequency, the beam should be 50% of the duty factor while the cavity should be operated in CW mode, to protect the downstream linac system. We focus on avoiding emittance growth by the space-charge effect and optimizing the RFQ to achieve a high transmission and low emittance growth. Both the RFQ beam dynamics study and RFQ cavity design study for two and three dimensions will be discussed.

关键词： heavy-ion accelerator RFQ accelerator high intensity RFQ beam dynamics RFQ cavity design

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Evaluation the Properties of Titanium Matrix Composites by Melting Route Synthesis

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journal of Materials Science & Technology 2008年第1期24卷 105-109页

作者： bong-jae Choi Si-Young Sung Myoung-Gyun kim Young-jig kim Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Department of Advanced Materials Engineering Sungkyunkwan University SuwonKorea Materials & Processing Engineering CenterR&D DivisionKorea Automotive Technology InstituteChonanChungnamKorea Research Institute of Industrial Science and Technology Pohang Korea

The main purpose of this study is an in-situ synthesis of （TiB＋TiC） hybrid titanium matrix composites （TMCs） by vacuum induction melting method and to verify its mechanical *** melting route was adopted to synthesize the commercial pure titanium （cp Ti） and granular boron carbide （B-4C）.The reinforcements,the fraction of 10 ***,were formed by adding 1.88 wt pct B-4C to cp *** in-situ synthesis of TMCs,electron probe micro-analysis elemental mapping was carried out to confirm the distribution and shape of *** cone-on-disk type sliding wear test was also done for the identification of *** is concluded that （TiB＋TiC） hybrid TMCs can be in-situ synthesized and has better wear properties than H13.

关键词： Titanium matrix composites H13 In-situ Wear

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