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Predicting long term remission by measuring immediate postoperative growth hormone levels in acromegaly

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Predicting long term remission by measuring immediate postop...

Effects of H_2/CO/CH_4 syngas composition variation on the NO_x and CO emission characteristics in a partially-premixed gas turbine combustor

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Eui Hyun Kim min chul oh Eun Jig Lee Sun Ho Kim Neurosurgery Yonsei Brain Research Institute Brain Korea 21 Project for Medical Science Severance Hospital Integrative Research Institute for Cerebral & Cardiovascular Diseases Yonsei University College of Medicine Seoul Korea Pituitary Tumor Clinic Institute of Endocrinology Brain Korea 21 Project for Medical Science Severance Hospital Integrative Research Institute for Cerebral & Cardiovascular Diseases Yonsei University College of Medicine Seoul Korea Endocrinology and Brain Korea 21 Project for Medical Science Severance Hospital Integrative Research Institute for Cerebral & Cardiovascular Diseases Yonsei University College of Medicine Seoul Korea Endocrinology Northwestern University Feinberg School of Medicine Chicago IL

＜正＞Objectives: The suppression of growth hormone （GH） on an oral glucose tolerance test （OGTT） has been accepted as the most reliable parameter for determining remission of acromegaly. In this study, we evaluat...

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Science China(Technological Sciences) 2016年第12期59卷 1804-1813页

作者： Lee min chul Department of Safety Engineering College of EngineeringFire Disaster Prevention Research CenterIncheon National University

This paper reports the effects of variations in the fuel composition of H_2/CO/CH_4 syngas on the characteristics of NO_x and CO emissions in a partially-premixed gas turbine combustor. Combustion tests were conducted on a full range of fuel compositions by varying each component gas from 0% to 100% at heat inputs of 40 and 50 k Wth. Flame temperature, combustor liner temperature, ignition delay time, and flame structure were investigated computationally and experimentally to judge whether they are significant indicators of NO_x and CO formation. The characteristics of and reasons for NO_x and CO emissions were investigated by analyzing the emission mechanisms and relationships among fuel property, equivalence ratio, flame temperature, liner temperature, flame shape. The flame structures were investigated using the following flame visualization methods:(1) time-averaged oh* chemiluminescence and its Abel-deconvolution;(2) direct photography; and(3) instantaneous oh-PLIF. The flame structures were greatly changed by the fuel composition and heat input, and they were subjected to key affecting parameters of the temperatures of the flames and the liners. NO_x and CO emissions also largely varied according to fuel composition and heat input, showing neither linearly nor exponentially clear proportional trends toward the syngas compositions because of the singular conditions. For example, only the 100% CO flame at low load emitted lots of CO, whereas complete combustion was observed in other cases. However, the qualitative observations showed that the root causes of NO_x emission behaviors were flame temperature and flame structure, which were directly related to the residence time in the flame. Various sets of practical test results were obtained, and these results could contribute to the optimal selection of the fuel-feeding condition when fuel is changed from natural gas to syngas in order to minimize NO_x and CO emissions with stable combustion.

关键词： gas turbine combustor NO_x and CO emission synthetic gas oh* chemiluminescence planar laser induced fluorescence

Characteristics of fever and response to antipyretic therapy in military personnel with adenovirus-positive community acquired pneumonia

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Military Medical Research 2020年第3期7卷 324-334页

作者： Hongseok Yoo Jimi oh chul Park Division of Pulmonary and Critical Care Medicine Department of Internal MedicineSamsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351South Korea Department of Anesthesiology and Pain Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Division of Pulmonary Medicine Department of Internal MedicineWonkwang University HospitalIksan 54538South Korea

Background:In 2014,an outbreak of adenoviral pneumonia occurred in the Korean military training ***,there are limited data on the characteristics of the fever and its response to antipyretic therapy in immunocompetent adults with adenovirus-positive community-acquired pneumonia(CAP).Methods:The medical records of the patients who were admitted to the Armed Forces Chuncheon Hospital for the treatment of CAP between January 2014 and December 2016 were retrospectively *** patients were divided into three groups,namely,the adenovirus-positive(Adv)group,the adenovirus-negative(Non-Adv)group and the unknown pathogen group,according to the results of a polymerase chain reaction(PCR)test and sputum culture used to measure adenovirus and other bacteria or viruses in respiratory *** evaluated and compared the demographics,clinicolaboratory findings and radiological findings upon admission between the two ***:Out of the 251 military personnel with CAP during the study periods,67 were classified into the Adv group,while 134 were classified into the Non-Adv group and 50 were classified into the unknown pathogen *** patients in the Adv group had a longer duration of fever after admission((3.2±1.6)d vs.(1.9±1.2)d vs.(2.2±1.5)d,P=0.018)and symptom onset((5.8±2.2)d vs.(3.9±2.5)d vs.(3.7±2.0)d,P=0.006)than patients in the Non-Adv and unknown pathogen groups,*** patients in the Adv group had a higher mean temperature at admission(37.8±0.3 vs.37.3±0.3 vs.37.3±0.3,P=0.005),and more patients were observed over 40 and 39 to 40(14.9%vs.2.2%vs.4.0%,35.8%vs.3.7%vs.6.0%,P<0.001)than those in the Non-Adv and unknown pathogen groups,*** Adv group more commonly had no response or exhibited adverse events after antipyretic treatment compared to the Non-Adv group(17.9%vs.1.5%,35.0%vs.4.3%,P<0.001,P=0.05,respectively).In addition,the time from admission to overall clinical stabilization was significantly longer in the patients

关键词： Adenovirus Fever Response to antipyretic treatment

Flora, life form characteristics, and plan for the promotion of biodiversity in South Korea＇s Globally Important Agricultural Heritage System, the traditional Gudeuljang irrigated rice terraces in Cheongsando

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Journal of Mountain Science 2017年第6期14卷 1212-1228页

作者： Hong chul PARK Chaang Hveon oh Korea National Park Research Institute Korea National Park Service Wonju-si Gangwon-do 26441 Korea Department of Biological and Environmental Science Dongguk University Goyang-si Ggeonggi-do 10326 Korea

The objectives of this study were to analyze the biodiversity of the Traditional Gudeuljang Irrigated Rice Terraces in Cheongsando, South Korea's representative GIAHS(Globally Important Agricultural Heritage System) site, with reference to position and land-use features, and to develop a plan to promote agricultural biodiversity in the region. We confirmed approximately 54,000 m2 of Gudeuljang paddy fields by an on-site survey. Of the Traditional Gudeuljang Irrigated Rice Terraces confirmed by onsite inspection, our survey showed that approximately 24,000 m2 are currently being used as paddy fields, approximately 15,000 m2 are being used as dry fields, and approximately 14,000 m2 are fallow. In terms of other non-agricultural land use, there was grassland, including graveyards; artificial arboreal land, such as orchards, rivers and wetlands, and man-made facilities, such as roads and residences. We also confirmed that the Traditional Gudeuljang Irrigated Rice Terraces had higher plant species diversity than conventional terraced rice paddies, and there was a difference in life form characteristics between the two types. Although the superficial topsoil structure is thesame for the Traditional Gudeuljang Irrigated Rice Terraces(TGIRTs) and conventional terraced rice paddies, it is thought that the differences in the subsurface structure of the TGIRTs contribute greatly to species and habitat diversity. However, the TGIRTs in Cheongsando are facing degeneration, due to damage and reduction in agricultural activity. The main cause is the reduction in the number of farming households due to an aging population in Cheongsando. In order to address this problem, we proposed a management plan, related to fallow paddy fields in South Korea, to initiate voluntary activities in the TGIRTs.

关键词： Globally Important Agricultural Heritage System Rice terrace Agricultural biodiversity Topsoil structure Gudeuljang

Potential effects of future adoption of the REDD mechanism as a preventive measure against deforestation and forest degradation in North Korea

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Journal of Mountain Science 2016年第9期13卷 1645-1651页

作者： Hong chul PARK Choong Hyeon oh Korea National Park Research Institute Korea National Park Service Department of Biological and Environmental Science Dongguk University

This study assesses potential effects of adaption to climate change in the future as a carbon related value using a baseline and credit approach, considering the implementation of the Reducing Emissions from Deforestation and forest Degradation （REDD） mechanism. Basic data were obtained for implementing the REDD mechanism in the Democratic People＇s Republic of Korea （DPRK） for scientific decision-making to prevent deforestation and forest degradation. The potential effects according to the implementation of the REDD mechanism in the DPRK based on forest status data （the latest） are as follows. If the deforestation rate is reduced to a level below 6% through a 20-year REDD mechanism beginning in 2011, 0.01-11.64 C-tons of carbon credit per ha could be issued for DPRK. Converted into C02-tons per ha, this amounts to 0.03-42.68 C02-tons, which translates to a minimum of 226,000 CO2-tons and a maximum of 289,082,000 C02-tons overall for forests in DPRK. In terms of carbon price, this measures up to 1.1o million USD- 1.4 billion USD, considering that the REDD carbon price in voluntary carbon markets in 2010 was around 5 USD.

关键词： Climate change Global warming Baseline approach Carbon Credit

Assessments of the effects of various fracture surface morphology on single fracture flow: A review

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International Journal of mining Science and Technology 2023年第1期33卷 1-29页

作者： min Gao Chengguo Zhang Joung oh School of minerals and Energy Resources Engineering University of New South WalesSydney NSW 2052Australia

Natural rock joint permeability deviates from the classic fluid flow governing equations due to the inher-ent fracture surface roughness(i.e.,contact points,spatial correlation,matching,varying aperture,iso-lated voids,infilling material,tortuosity and channellings)and engineering disturbance such as *** improve the accuracy of fracture permeability evaluation,many efforts have been made in analytical,experimental,and numerical *** study reviews the modified mathematical gov-erning equations of fluid flow and classifies them based on different influencing factors,such as friction factor,aperture,tortuosity,inertia,and various in situ stress *** experimental and simulation techniques for the coupled normal-and shear-stress flow problems were assessed,and their advantages and disadvantages were also ***,different surface roughness descriptions and their impacts on mechanical and hydraulic behaviours were discussed,followed by the potential research directions for fracture flow problems.

关键词： Surface roughness Single fracture Nonlinear flow Coupled hydromechanical(HM)behaviours

Development of fault section identification technique for low voltage DC distribution systems by using capacitive discharge current

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Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 509-520页

作者： chul-Ho Noh chul-Hwan KIM Gi-Hyeon GWON Yun-Sik oh College of Information and Communication Engineering Sungkyunkwan University

The increasing importance of energy efficiency has led to several studies related to the construction of a reliable low voltage DC(LVDC) distribution ***, studies on a protection scheme that considers the fault characteristics of an LVDC distribution system are essential to improve system reliability. When compared to a conventional distribution system, the most distinct feature of an LVDC distribution system is the existence of a capacitive discharge current from converters under a fault condition that results in the prompt operation of protection devices. Therefore, this study involves proposing a precise and rapid technique to identify the fault section in an LVDC distribution system. The technique involves two stages, namely: an analysis stage to analyze the capacitive discharge current and a decision stage to identify the fault section based on the fault type. A detailed discussion of each step is presented and its feasibility is verified based on the results of simulations with an ElectroMagnetic Transients Program and MATLAB~?.

关键词： Capacitive discharge current Fault section identification Fault type identification Low voltage DC distribution system

Upcycling of polyethylene terephthalate to1,4-cyclohexanedimethanol in water

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Science China Chemistry 2025年

作者： Shuhui Fang Zhiwen Gao Xinrui Shi min Zhang Wei Zhang Yue Liu State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University Engineering Center for Sustainable Carbon Science and Technology East China Normal University Institute of Eco-Chongming

The recycling of waste polyethylene terephthalate（PET）, an extensively used polymer as plastic and fiber materials, has become an urgent topic due to the rapid generation and accumulation of plastic waste into the environment. Current chemical recycling approaches to depolymerize and convert PET into 1,4-cyclohexanedimethanol（CHDM）, an important chemical in the production of advanced polyesters, predominantly use organic solvents, such as alcohols or dioxane. Herein, we developed an environmentally friendly and economically viable pathway for converting PET to CHDM using water as the solvent. In this process, PET is sequentially hydrolyzed in water, hydrogenated to 1,4-cyclohexane dicarboxylic acid（CHDA）, and then reduced to CHDM. The PET conversion rate is self-enhanced in aqueous medium via acid-catalyzed hydrolysis by the generated CHDA intermediate. A Pd-based catalyst（e.g., Pd/C） selectively hydrogenates the arene ring of the PET monomer, terephthalic acid intermediate, and a Ru-Sn/C bimetallic catalyst reduces its COoh to CH2oh group. At optimized reaction conditions, a complete conversion of PET and 80.1% yield of CHDM are obtained. Alternatively, this approach can also efficiently produce CHDA from PET, with a yield up to 86.4%.

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1.45 GPa ultrastrong cryogenic strength with superior impact toughness in the in-situ nano oxide reinforced CrMnFeCoNi high-entropy alloy matrix nanocomposite manufactured by laser powder bed fusion

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Journal of Materials Science & Technology 2022年第2期97卷 10-19页

作者： Young-Kyun Kim min-chul Kim Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon 22212Republic of Korea Korea Atomic Energy Research Institute(KAERI) Daejeon 34057Republic of Korea

CrMnFeCoNi high-entropy alloys(HEAs)exhibit an excellent combination of tensile strength and ductility at cryogenic *** study led to the introduction of a new method for the development of high-performance CrMnFeCoNi HEAs at cryogenic temperatures by jointly utilizing additive manufacturing(AM)and the addition of interstitial *** interstitial oxygen present in the powder feedstock was transformed into beneficial nano-sized oxides during AM *** HEA nanocomposite fabricated using laser powder bed fusion(L-PBF)not only contains heterogeneous grains and substructures but also a high number density of nano-sized *** tensile results revealed that the L-PBF HEA nanocomposite has superior yield strengths of 0.77 GPa and 1.15 GPa,and tensile strengths of 0.92 GPa and 1.45 GPa at 298 K and 77 K,*** addition,the Charpy impact energies of the samples tested at 298 K and 77 K were measured as 176.2 J and 103.7 J,*** results indicate that the L-PBF HEA nanocomposite successfully overcomes the well-known strength-toughness *** tensile deformation microstructure contained a relatively large number of deformation twins(DTs)at cryogenic temperature,a possible consequence of the decrease in the stacking fault energy with decreasing *** the other hand,cracks were found to propagate along the grain boundaries at room temperature,whereas a transgranular crack was observed at cryogenic temperature in the specimens fractured as a result of the Charpy impact.

关键词： Laser powder bed fusion High-entropy alloy matrix nanocomposite Nano-oxide:cryogenic Tensile Impact toughness