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Solid-state phase transformations toward a metal-organic framework of 7-connected Zn_(4)0 secondary building units

Nano Research 2021年第2期14卷 411-416页

作者： jaehui Kim Junsu Ha jae hwa lee Hoi Ri Moon Department of Chemistry Ulsan National Institute of Science and Technology(UNIST) Ulsan 44919Republic of Korea

In the development of metal-organic frameworks(MOFs),secondary building units(SBUs)have been utilized as molecular modules for the construction of nanoporous materials with robust *** solvothermal synthetic conditions,dynamic changes in the metal coordination environments and ligand coordination modes of SBUs determine the resultant product ***,MOF phases with new topologies can also be achieved by post-synthetic treatment of as-synthesized MOFs via the introduction of acidic or basic moieties that cause the simultaneous cleavage/reformation of coordination bonds in the solid *** this sense,we studied the solid-state transformation of two ndc-based Zn-MOFs(ndc=1,4-naphthalene dicarboxylate)with different SBUs but the same pcu topology to another MOF with sev *** of the chosen MOFs with pcu nets is[Zn_(2)(ndc)_(2)(bpy)]_(n)(bpy=4,4,-bipyridine),(6C_(bpy)-MOF)consisting of a 6-connected pillared-paddlewheel SBU,and the other is IRMOF-7 composed of 6-connected Zn40(C 00)6 SBUs and *** post-structural modification,these pcu MOFs were converted into the same MOF with sev topology constructed from the uncommon 7-connected Zri_(4)O(COO)_(7)SBU(7C-MOF).The appropriate post-synthetic conditions for the transformation of each SBUs were systematically *** addition,the effect of the pillar molecules in the pillared-paddlewheel MOFs on the topology conversion was studied in terms of the linker basicity,which determines the inertness during the solid-state phase *** post-synthetic modification approach is expected to expand the available methods for designing and synthesizing MOFs with controlled topologies.

关键词： metal-organic framework secondary building units solid-state transform ation linker basicity ligand addition reaction

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Regulation of sleep by astrocytes in the hypothalamic ventrolateral preoptic nucleus

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Neural Regeneration Research 2025年第4期20卷 1098-1100页

作者： jae-Hong Kim Ruqayya Afridi Il-Sung Jang Maan Gee lee Kyoungho Suk Brain Korea 21 four KNU Convergence Educational Program of Biomedical Sciences for Creative Future Talents School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of DentistryKyungpook National UniversityDaeguRepublic of Korea Brain Science&Engineering Institute Kyungpook National UniversityDaeguRepublic of Korea

Astrocytes are functionally dynamic cells that support neurons in multiple ways throughout an organism’s *** astrocytic regulation of neuronal activity has been increasingly recognized in recent *** are now recognized as playing a more complex role than mere bystanders in the central nervous ***,their role in regulating the sleep neurocircuitry is not well *** this perspective,we highlight the role of astrocytes in sleep modulation,with a particular focus on regulatory mechanisms related to the ventrolateral preoptic nucleus(VLPO)of the *** briefly discuss recent literature reporting the role of VLPO astrocytes in regulating sleep-associated behaviors.

关键词： sleep ventrolateral astrocytes

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Ru/NiMnB spherical cluster pillar for highly proficient green hydrogen electrocatalyst at high current density

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Journal of Energy Chemistry 2025年第1期100卷 397-408页

作者： Md Ahasan Habib Shusen Lin Mehedi Hasan Joni Sumiya Akter Dristy Rutuja Mandavkar jae-Hun Jeong Jihoon lee Department of Electronic Engineering College of Electronics and Information Kwangwoon University

Advanced OER/HER electrocatalytic alternatives are crucial for the wide adaptation of green hydrogen ***,Ru/NiMnB spherical cluster pillar （SCP）,denoted as Ru/NiMnB,is synthesized using a combination of electro-deposition and hydrothermal *** investigation of Ru doping in the NiMnB matrix revealed significant improvements in electrocatalytic *** Ru/NiMnB SCPs demonstrate superior OER/HER activity with low overpotentials of 150 and 103 mV at 50mA/cm2in 1 M KOH,making them highly competitive with state-of-the-art ***,the Ru/NiMnB SCPs exhibit a low 2-E cell voltage of 2.80 V at ultra-high current density of 2,000 m A/cm2in 1 M KOH,outperforming the standard benchmark electrodes of RuO2||Pt/C,thereby positioning Ru/NiMnB as one of the best bifunctional *** SCPs exhibit exceptional high-current characteristics,stability and corrosion resistance,as evidenced by continuous operation at 1,000 mA/cm2high-current density for over 150 h in 6 M KOH at elevated temperatures under harsh industrial *** a small amount of Ru incorporation significantly enhances the electrocatalytic performances of NiMnB,attributed to increased active sites and improved intrinsic properties such as conductivity,adsorption/desorption capability and reaction ***,Ru/NiMnB SCPs present a promising bi-functional electrode concept for efficient green H2production.

关键词： Potassium hydroxide

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Improvement of light uniformity by lighting arrangement for standardized crop production

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Journal of Central South University 2014年第11期21卷 4311-4319页

作者： lee hwa-Soo Kwon Sook-Youn Lim jae-Hyun Department of Computer Science and Engineering Kongju National UniversityCheonan 331-717 Korea

In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible.

关键词： high-quality crop light uniformity improvement optimal lighting layout fully artificial plant factory Relux simulation

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Prediction of grain structure in direct-chill cast Al–Zn–Mg–Cu billets using cellular automaton-finite element method

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Progress in Natural Science:Materials International 2021年第3期31卷 434-441页

作者： Min-Seok Kim Sang-hwa lee jae-Gil Jung Kwangjun Eah Department of Materials Science and Engineering Gachon University Metallic Materials Division Korea Institute of Materials Science Department of Materials Science and Engineering Yonsei University

A cellular automaton-finite element(CA-FE) model was used to predict the solidification grain structure of permanent mold cast A7086 alloy. In this model, a Gaussian distribution of nucleation sites was adopted, and the Kurz-Giovanola-Trivedi model was extended to a multicomponent Al–Zn–Mg–Cu alloy system to determine the growth kinetics of the dendrite tip. For describing the Gaussian distribution of nucleation sites on the mold surface, an empirical relationship between the initial cooling rate of the melt and the nucleation density was proposed. Under various casting conditions, the calculated grain structures agreed well with the experimental results. Subsequently, the model was applied to the direct-chill(DC) cast billets, and the simulated grain structures reproduced well the experimental results. This confirmed that the current CA-FE model can be used practically and effectively in DC casting processes.

关键词： Cellular automaton-finite element (CA-FE) model Direct-chill casting Al–Zn–Mg–Cu alloy A7068 alloy Grain structure

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Ionizing terahertz waves with 260 MV/cm from scalable optical rectification

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Light(Science & Applications) 2024年第6期13卷 1075-1087页

作者： Hyeongmun Kim Chul Kang Dogeun Jang Yulan Roh Sang hwa lee Joong Wook lee jae Hee Sung Seong Ku lee Ki-Yong Kim Advanced Photonics Research Institute GISTGwangju61005Korea Department of Physics and Optoelectronics Convergence Research Center Chonnam National UniversityGwangju61186Korea Pohang Accelerator Laboratory POSTECHPohang37673Korea Center for Relativistic Laser Science Institute for Basic ScienceGwangju61005Korea Institute for Research in Electronics and Applied Physics Department of PhysicsUniversity of MarylandCollege ParkMaryland20742USA

Terahertz(THz)waves,known as non-ionizing radiation owing to their low photon energies,can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and ***,we demonstrate the generation of ionizing,multicycle,15-THz waves emitted from large-area lithium niobate crystals via phase-matched optical rectification of 150-terawatt laser pulses.A complete characterization of the generated THz waves in energy,pulse duration,and focal spot size shows that the field strength can reach up to 260 megavolts per *** particular,a single-shot THz interferometer is employed to measure the THz pulse duration and spectrum with complementary numerical *** intense THz pulses are irradiated onto various solid targets to demonstrate THz-induced tunneling ionization and plasma *** study also discusses the potential of nonperturbative THz-driven ionization in gases,which will open up new opportunities,including nonlinear and relativistic THz physics in plasma.

关键词： optical interferometer matched

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A comprehensive approach to a variability analysis between earthquake activity and hydro-environmental factors on the Korean Peninsula

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 937-950页

作者： jae-Kyoung lee Innovation Center for Engineering Education Daejin UniversityPocheon-siGyeonggi-do487-711Republic of Korea

Following the Pohang and Gyeongju earthquakes and their aftershocks,there is no longer any zone that is safe from earthquake-related disasters in the Korean *** order to monitor and predict earthquakes,correlation analysis of earthquakes and hydro-environmental factors are insufficient,and the development and application of hydro-environmental factor measurement equipment is still in the early *** study developes and verifies a more precise radon measurement *** specific earthquake cases(2019–2020)were selected,and the correlation of the analyses of the earthquakes and hydro-environmental factors(radon,electric conductivity(EC),water-level(WL),and water-temperature(WT))was conducted at the three specific groundwater ***,was confirmed that four factors are affected by earthquakes or seismic ***,the variability of the EC showed an identical tendency for a certain period before an earthquake occurred,and,in particular,the variability trends for radon,WL,and EC coincided at the time of the earthquake′s occurrence.

关键词： variability analysis earthquake radon hydro-environmental factor

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Bee wax coated water-soluble fraction of bee venom improved altered glucose homeostasis in streptozotocin-induced diabetic rats

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Journal of Traditional Chinese Medicine 2019年第6期39卷 842-852页

作者： Rangachari Balamurugan Jeong hwa Kim Mi-na Jo Chenglian Xue Jin kyu Park jae Kwon lee Department of Beesen Lab 204Beesen Co.Ltd.Bioventure TownYuseong Daero 1662Dae Jeon 34054Republic of Korea Department of Biology Education College of EducationChungbuk National UniversityCheongju 28644Republic of Korea

OBJECTIVE:To evaluate the anti-diabetic efficacy of orally administered bee wax coated water-soluble fraction of bee venom(BWCBVA)drug over orally administered bee wax(BW)and intraperitoneally administered whole bee venom(BV)in streptozotocin(STZ)-induced diabetic ***:Diabetes induced by intraperitoneal administration of 60 mg/kg STZ was treated with BWCBVA,BW,and BV for 21 *** biochemical,protein and histological changes,and physical characteristics of BWCBVA were then ***:The BWCBVA group shows significantly decreased blood glucose level as compared to the BW and intraperitoneally administered whole BV treated ***,BWCBVA significantly normalizes the serum biochemical parameters and increases the body ***,administration of BWCBVA significantly reverses the altered liver expression of phosphatidylinositide 3-kinases-p85 and liver *** analysis of the pancreas an increase in the islet cell numbers and decrease inβ-cell ***-administering BWCBVA 0.25 mg/kg with nifedipine(6.8 mg/kg)and nicorandil(13.8 mg/kg)to the diabetic rats results in insulin secretion through enhanced calcium ion *** performance liquid chromatography and gas chromatography was performed to identify the pharmacologically important compounds present in ***:Our results indicate that BWCBVA,an orally administered colon specific drug delivery system,can be effective in treating diabetes mellitus.

关键词： Diabetes Mellitus Waxes Bee venoms Streptozotocin

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Primary malignant melanoma of uterine cervix: a suggestion of new scheme of treatment combination

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Chinese Journal of Cancer Research 2014年第3期26卷 351-354页

作者： Kyung-Jin Min Yeun-Sun Kim Jin-hwa Hong jae-Kwan lee Dae-Sik Yang Department of Obstetrics and Gynaecology Korea University Medical Centre Department of Radiation Oncology Korea University Medical Centre

Historically, the lack of melanocytes in the vaginal and cervical mucus membranes has deterred the findings of primary melanomas. Mainly due to its rarity, difficulty to diagnose, and poor prognosis, there has been no absolute agreement on comprehensive treatment so far. In this case report, we present a case of a 46-year-old woman with primary malignant melanoma of uterine cervix. She underwent neo-adjuvant chemotherapy initially followed by a radical hysterectomy. After adjuvant concurrent chemo-radiation, the patient has been followed up for 24 months. So far, she has not shown any symptoms or signs of recurrence. Further studies with more cases based on variable combinations of treatment regimen have been on the way.

关键词： Malignant melanoma uterine cervix neo-adjuvant chemotherapy chemo-radiation

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Survival Analysis of Stage Ⅳ Metastatic Gastric Cancer Patients Treated with HangAm-Plus

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Chinese Journal of Integrative Medicine 2014年第1期20卷 49-55页

作者： jae-Woo Park Jeungwon Yoon Chong-Kwan Cho Yeon-Weol lee hwa-Seung Yoo East-West Cancer Center Dunsan Oriental Hospital of Daejeon University

Objective：To evaluate the efficacy of HangAm-Plus（HAP）on stageⅣmetastatic gastric cancer by analyzing the treated patients’overall survival ***：Following the study eligibility,overall survival and one year survival rate of 44 stageⅣmetastatic gastric cancer patients who visited EastWest Cancer Center（EWCC）were *** study consisted of two arms：HAP treatment only（n=18）and combined treatment of concurrent conventional chemotherapy and HAP（n=26）.Patient characteristics by gender,age,surgical intervention,Eastern Cooperative Oncology Group（ECOG）score,treatment duration（〈4 weeks or≥4 weeks）,and lines of the chemotherapy received were *** related side effects were also ***：The median survival of combined group was longer（10.0 months）than that of HAP group（5.1 months）.One-year survival rate of combined treatment group and HAP group was 38.5%±9.5%and 33.3%±11.1%,respectively（P〉0.05）.One-year survival rate of those received more and less than 4-week treatment was 57.1%±18.7%and 8.3%±8.0%,respectively（P=0.001）.Conclusions：The study supports the safety and potential efficacy of HAP treatment in prevention of chemo-related side effects for stageⅣmetastatic gastric cancer treated with conventional *** studies are needed to investigate and confirm the results before applying the treatment in clinical settings.

关键词： advanced gastric cancer supportive care Chinese materia medica Oriental medicine

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