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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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A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

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Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian Guo Kunpeng Li Wei Yue Nam‑young kim Yang Li Guozhen Shen Jong‑Chul Lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency Integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State Key Laboratory of Integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

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Apolipoprotein A-I binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

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Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan Choi Soo-Ho Choi Keun-young kim Yury I.Miller Won-Kyu Ju Hamilton Glaucoma Center and Shiley Eye Institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and Imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

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Effect of partial elastic foundation on free vibration of fluid-filled functionally graded cylindrical shells

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Acta Mechanica Sinica 2015年第6期31卷 920-930页

作者： young-Wann kim Department of Mechanical Design Engineering Chonnam National University

The free vibration characteristics of fluid-filled functionally graded cylindrical shells buried partially in elas- tic foundations are investigated by an analytical method. The elastic foundation of partial axial and angular dimen- sions is represented by the Pasternak model. The motion of the shells is represented by the first-order shear defor- mation theory to account for rotary inertia and transverse shear strains. The functionally graded cylindrical shells are composed of stainless steel and silicon nitride. Material prop- erties vary continuously through the thickness according to a power law distribution in terms of the volume fraction of the constituents. The governing equation is obtained using the Rayleigh-Ritz method and a variation approach. The fluid is described by the classical potential flow theory. Numerical examples are presented and compared with existing available results to validate the present method.

关键词： Functionally graded material· Fluid-filledshell· Pasternak elastic foundation · Vibration

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Characteristics analysis and library development for piezoelectric transformer to drive a ballast for a 35 W class fluorescent lamp using PSPICE modeling

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Journal of Central South University 2016年第1期23卷 169-180页

作者： kim young-Choon Division of Mechanical and Automotive Engineering College of Engineering Kongju National University

PSPICE model driven by an electric equivalent circuit of a piezoelectric circuit is presented. In order to confirm this model to be effective, an independent model of cold cathode fluorescent lamp(CCFL) driving circuit is used to conduct simulations, leading to a precise modeling. A library is configured through modeling and its accuracy is verified through simulations for widely used and representative lamps such as CCFL, fluorescent lamps, HID lamps, and electrodeless fluorescent lamps. On the basis of experiments, a lamp simulation is also performed using PSPICE, which allows us to take advantage of the lamp library easily. Also, PSPICE model driven by an electric equivalent circuit of a piezoelectric transformer is presented. In order to confirm this model to be effective, an independent model of CCFL driving circuit is used to conduct simulations, leading to a precise modeling. In addition, a new type of electronic ballast is proposed, which allows 35 W-class(T5-class) fluorescent lamp to work. This system is built by a rectifier which has improved power factor and half-bridge series resonant inverter. Also, with size of 27.5 mm high, 27.5 mm wide and 2.5 mm thick, the produced piezoelectric transformer has a high step-up ratio, through which it is possible for the electric ballast circuit to be lighter, smaller and more efficient. After the produced ballast is used to drive the fluorescent lamp for 25 min, it yields 0.95 in power factor correction, 86% in efficiency, 35.07 W in output voltage and 20.5 °C in temperature increase while meeting the characteristics of the 35 W-class fluorescent lamp.

关键词： PSPICE 35 W-class cold cathode fluorescent lamp (CCFL) fluorescent lamp library

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Optimal Center-of-Mass Pivot Effect of Spinal Motion in Feline Galloping

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Journal of Bionic Engineering 2020年第5期17卷 970-977页

作者： young Kook kim Dongwon Yun LV R&D team Electro-technology R&D CenterLS ELECTRIC Co.LtdCheongju 28437South Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988South Korea

In this paper,we studied the acceleration behavior of a quadruped animal during a galloping *** the development of many quadruped robotic systems has been focused on dynamic movements,it is obvious that guidance from the dynamic behavior of quadruped animals is needed for robotics *** fulfill this demand,this paper deals with analysis of the galloping motions of a domestic cat,which is well known for its excellent acceleration performance among four-legged *** on the planar motion capture environment,the movement data of a galloping feline was acquired and the dynamic motions were estimated using a spring-mass *** particular,the effects of the position and angle of the center-of-mass of the cat,angular displacement of the spine,and angular velocity of the spine were analyzed and are discussed *** this process,it was possible to understand the dynamic movement characteristics of the cat,and to understand the relationships between,and the influences of,these *** this analysis,we provide significant data applicable to the design of joint movements in quadruped robot systems.

关键词： quadrupedalism feline galloping domestic cat center-of-mass

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Clinical features of gastric adenoma detected within 3 years after negative screening endoscopy in Korea

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Gastroenterology Report 2023年第1期11卷 406-411页

作者： Hyun young kim Department of Internal Medicine Seoul National University Bundang HospitalSeongnam-siGyeonggi-doKorea

Background:Early detection and management of gastric adenoma are important for preventing gastric *** present study aimed to evaluate the predictors of missed gastric adenoma on screening endoscopy in Korea and identify the risk factors associated with interval precancerous gastric ***:All cases of gastric adenomas diagnosed via screening endoscopy between 2007 and 2019 were *** them,those who had undergone endoscopy within 3 years were included in the present *** gastric adenoma was defined as gastric adenoma diagnosed within 3 years after negative screening ***:In total,295 cases of gastric adenoma were *** these,95(32.2%)were missed gastric adenoma cases(mean age,60.6 years;average interval between final and index endoscopies,12.6months);the remaining 200(67.8%)were newly detected adenoma *** analysis revealed thatmale sex,endoscopist experience,observation time,and presence of gastric intestinalmetaplasia(pathologically proven)were associated with missed gastric *** analysis revealed that gastric intestinal metaplasia(odds ratio[OR],2.736;95%confidence interval[CI],1.320–5.667;P=0.007)and shorter observation time of the index screening endoscopy(B,0.011;OR,0.990;95%CI,0.986–0.993;P<0.001)were independent risk factors for missed gastric *** optimal cut-off for the observation time for detecting gastric adenoma was 3.53minutes(area under curve,0.738;95%CI,0.677–0.799;P<0.001).Conclusions:Gastric intestinal metaplasia is an indication of missed gastric ***,careful inspection of gastric mucosa with gastric intestinal metaplasia and proper observation time can lower the possibility of missing the gastric adenoma during screening.

关键词： gastric adenoma screening endoscopy gastric intestinal metaplasia observation time

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Atrial natriuretic peptide signal pathway upregulated in stomach of streptozotocin-induced diabetic mice

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World Journal of Gastroenterology 2010年第1期16卷 48-55页

作者： young-Chul kim Department of Physiology Chungbuk National University College of Medicine

AIM:To investigate atrial natriuretic peptide(ANP) secretion from gastric mucosa and the relationship between the ANP/natriuretic peptide receptor type A (NPR-A)pathway and diabetic gastroparesis. METHODS:Male imprinting control region(ICR)mice (4 wk old)were divided into two groups:control mice, and streptozotocin-induced diabetic *** weeks after injection,spontaneous gastric contraction was recorded by using physiography in control and streptozotocin-induced diabetic *** ANP-positive cells in gastric mucosa and among dispersed gastric epithelial cells were detected by using immunohistochemistry and flow cytometry,*** and natriureticpeptide receptor type A(NPR-A)gene expression in gastric tissue was observed by using the reverse transcriptase polymerase chain reaction. RESULTS:The frequency of spontaneous gastric contraction was reduced from 12.9±0.8 cycles/min in the control group to 8.4±0.6 cycles/min in the diabetic mice(n=8,P<0.05).However,the amplitude of contraction was not significantly affected in the diabetic *** depletion of interstitial cells of Cajal in the gastric muscle layer was observed in the diabetic ***-positive cells were distributed in the gastric mucosal layer and the density index of ANP-positive cells was increased from 20.9±2.2 cells/field in control mice to 51.8±2.9 cells/field in diabetic mice(n=8, P<0.05).The percentage of ANP-positive cells among the dispersed gastric epithelial cells was increased from 10.0%±0.9%in the control mice to 41.2%± 1.0%in the diabetic mice(n=3,P<0.05).ANP and NPR-A genes were both expressed in mouse stomach, and the expression was significantly increased in the diabetic mice. CONCLUSION:These results suggest that the ANP/ NPR-A signaling pathway is upregulated in streptozotocin-induced diabetic mice,and contributes to the development of diabetic gastroparesis.

关键词： Diabetes mellitus Atrial natriuretic peptide Gastric mucosa Gastroparesis

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Some New Inverse-type Hilbert-Pachpatte Integral Inequalities

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Acta Mathematica Sinica,English Series 2004年第1期20卷 57-62页

作者： young Ho kim Department of Applied Mathematics Changwon National UniversityChangwon 641-773Korea

In this paper, some new generalizations of inverse type Hilbert-Pachpatte integral inequalities are proved. The results of this paper reduce to those of Pachpatte (1998, J. Math. Anal. Appl. 226, 166–179) and Zhao an... 详细信息

关键词： Hilbert’s double integral inequality H(?)lder integral inequality Jensen’s inequality Power mean inequality

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Network-Aided Intelligent Traffic Steering in 5G Mobile Networks

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Computers, Materials & Continua 2020年第10期65卷 243-261页

作者： Dae-young kim Seokhoon kim School of Computer Software Daegu Catholic UniversityGeyongsan38430Korea Department of Computer Software Engineering Soonchunhyang UniversityAsan31538Korea

Recently,the fifth generation(5G)of mobile networks has been deployed and various ranges of mobile services have been *** 5G mobile network supports improved mobile broadband,ultra-low latency and densely deployed massive *** allows multiple radio access technologies and interworks them for services.5G mobile systems employ traffic steering techniques to efficiently use multiple radio access ***,conventional traffic steering techniques do not consider dynamic network conditions *** this paper,we propose a network aided traffic steering technique in 5G mobile network architecture.5G mobile systems monitor network conditions and learn with network *** a machine learning algorithm such as a feed-forward neural network,it recognizes dynamic network conditions and then performs traffic *** proposed scheme controls traffic for multiple radio access according to the ratio of measured ***,it can be expected to improve traffic steering *** performance of the proposed traffic steering scheme is evaluated using extensive computer simulations.

关键词： Mobile network 5G traffic steering machine learning MEC

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