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Comb-mode resolved spectral domain interferometer enabled by a broadband electro-optic frequency comb

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Photonics Research 2023年第1期11卷 72-80页

作者： YOON-SOO jang JUNGjae PARK JONGHAN JIN Length Group Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Major of Precision Measurement University of Science and TechnologyDaejeon 34113Republic of Korea

The spectral domain interferometer(SDI)has been widely used in dimensional *** on the nature of the SDI,both wider spectral bandwidth and narrower linewidth of the light source are paradoxically required to achieve better resolution and longer measurable *** this perspective,a broadband frequency comb with a repetition rate high enough to be spectrally resolved can be an ideal light source for *** this paper,we propose and implement a broadband electro-optic frequency comb to realize a comb-mode resolved *** proposed electro-optic frequency comb was designed with an optically recirculating loop to provide a broadband spectrum,which has a repetition rate of 17.5 GHz and a spectral range of 35 *** a preliminary test,we demonstrated absolute distance measurements with sub-100 nm *** of these advantages,we believe this electro-optic frequency comb can open up new possibilities for SDIs.

关键词： interferometer resolved spectral

Role of milk carbohydrates in intestinal health of nursery pigs: a review

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Journal of Animal Science and Biotechnology 2022年第3期13卷 628-641页

作者： Ki Beom jang Sung Woo Kim Department of Animal Science North Carolina State UniversityRaleighNC 27695USA

Intestinal health is essential for the resistance to enteric diseases and for nutrient digestion and absorption to support *** intestine of nursery pigs are immature and vulnerable to external challenges,which cause negative impacts on the structure and function of the *** nutritional interventions,the benefits of milk are significant for the intestinal health of *** coproducts have traditionally been used in starter feeds to improve the growth of nursery pigs,but their use is somewhat limited due to the high costs and potential risks of excessive lactose on the ***,understanding a proper feeding level of milk carbohydrates is an important start of the feeding *** nursery pigs,lactose is considered a highly digestible energy source compared with plant-based starch,whereas milk oligosaccharides are considered bioactive compounds modulating intestinal immunity and ***,milk carbohydrates,mainly composed of lactose and oligosaccharides,have essential roles in the intestinal development and functions of nursery *** proper feeding levels of lactose in starter feeds could be variable by weaning age,body weight,or genetic *** of lactose and milk oligosaccharides have been broadly studied in human health and animal ***,this review focuses on the mechanisms of lactose and milk oligosaccharides affecting intestinal maturation and functions through modulation of enterocyte proliferation,intestinal immunity,and intestinal microbiota of nursery pigs.

关键词： Intestinal health Lactose Milk carbohydrates Milk oligosaccharides Nursery pig

Effects of Wind Fences on the Wind Environment around jang Bogo Antarctic Research Station

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Advances in Atmospheric Sciences 2017年第12期34卷 1404-1414页

作者： jang-Woon WANG jae-Jin KIM Wonsik CHOI Da-Som MUN Jung-Eun KANG Hataek KWON Jin-Soo KIM Kyung-Soo HAN Department of Environmental Atmospheric Sciences Pukyong National University 45Yongso-ro Korea Polar Research Institute 26 Songdomirae-ro Yeonsu-gu Department of Spatial Information Engineering Pukyong National University 45Yongso-ro

This study investigated the flow characteristics altered by jang Bogo Antarctic Research Station using computational fluid dynamics(CFD) modeling. The topography and buildings around jang Bogo Station were constructed with computeraided-design data in the CFD model domain. We simulated 16 cases with different inflow directions, and compared the flow characteristics with and without jang Bogo Station for each inflow direction. The wind data recorded by the site’s automatic weather station(AWS) were used for comparison. Wind rose analysis showed that the wind speed and direction after the construction of jang Bogo Station were quite different from those before construction. We also investigated how virtual wind fences would modify the flow patterns, changing the distance of the fence from the station as well as the porosity of the fence. For westerly inflows, when the AWS was downwind of jang Bogo Station, the decrease in wind speed was maximized(-81% for west-northwesterly). The wind speed reduction was also greater as the distance of the fence was closer to jang Bogo Station. With the same distance, the fence with medium porosity(25%–33%) maximized the wind speed *** results suggest that the location and material of the wind fence should be selected carefully, or AWS data should be interpreted cautiously, for particular prevailing wind directions.

关键词： jang Bogo Antarctic Research Station CFD model observation environment wind fence porosity

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绚丽多彩的量子点世界

科学 2024年第1期76卷 46-49页

作者：朱国浩姜雪峰华东师范大学化学与分子工程学院上海200062

2023年诺贝尔化学奖授予美国麻省理工学院的巴旺迪、哥伦比亚大学的布鲁斯和纽约纳米晶体技术公司的叶基莫夫,以表彰他们在“量子点发现及合成”领域做出的杰出贡献。2023年10月4日,瑞典皇家科学院宣布将今年的诺贝尔化学奖授予巴旺迪(*... 详细信息

2023年诺贝尔化学奖授予美国麻省理工学院的巴旺迪、哥伦比亚大学的布鲁斯和纽约纳米晶体技术公司的叶基莫夫,以表彰他们在“量子点发现及合成”领域做出的杰出贡献。2023年10月4日,瑞典皇家科学院宣布将今年的诺贝尔化学奖授予巴旺迪(***)、布鲁斯(***)和叶基莫夫(***),以表彰他们发现和合成量子点。

关键词：诺贝尔化学奖量子点纳米晶体

Catalysts for electrochemical ammonia oxidation:Trend,challenge,and promise

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Science China Materials 2022年第12期65卷 3334-3352页

作者： Sol A Lee Mi Gyoung Lee Ho Won jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Electrical and Computer Engineering University of TorontoToronto M5S 3G4OntarioCanada Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

Developing sustainable and clean energy technology is critial to address the current energy and environmental *** an energy carrier,hydrogen has been getting attention due to its abundance,high energy density,and zero carbon *** to the difficulty of hydrogen storage and transport,the electro-oxidation of ammonia shows great potential for renewable energy since it satisfies both energy supply and environmental protection as a carbon-free fuel with high hydrogen ***,ammonia electro-oxidation is a sluggish reaction and shows low *** the complicated mechanism and intermediates is conducive to developing efficient electrocatalysts with high catalytic activity and *** review begins with the ammonia oxidation technologies and their *** two typical mechanisms for ammonia electro-oxidation,Oswin-Salomon mechanism and Gerischer-Mauerer mechanism,are discussed,and attention to the poisoning species is ***,the electrocatalysts for ammonia reaction are classified into Pt-based catalysts and non-noble metal-based catalysts,and their performances are reviewed with various *** on the progress on the electrochemical ammonia oxidation catalysts,the challenges and future insight on ammonia oxidation reaction are discussed and proposed.

关键词： NH3 oxidation reaction electrocatalysts green hydrogen

High-performance and current crowding-free InGaN-GaN- based LEDs integrated by an electrically-reverse-connected Schottky diode and a Mg-delta doped p-GaN

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Frontiers of Optoelectronics 2012年第2期5卷 127-132页

作者： Sei-Min KIM Seon-Ho jang Ja-soon jang Department of Electronic Engineering LED-IT Fusion Technology Research Center (LIFTRC) Yeungnam University Gyeongbuk 712 749 Korea

This work demonstrates high-performance and current crowding-free InGaN/GaN light-emitting diodes （LEDs） using an electrically-reverse-connected Schottky diode （SD） and an Mg-delta （δ） doped layer. Possible mechanism of carrier transport at the interface between transparent conducting electrode （TCE） and p-GaN with the δ-doped layer is also investigated. Results show that the LED with the SD and Mg delta （δ）-doping layer yields lower series resistance, higher output power, and lower reverse leakage current compared to normal LEDs. In addition, unlike the normal LED, there is no occurrence for the current crowding effect in the proposed LED even at high current density of 380mA/cm2. These remarkable behaviours clearly indicate that the use of the SD and δ- doping in the p-GaN region is very promising to achieve high-brightness and excellent-reliability GaN-based LEDs.

关键词： GaN light-emitting diode (LED) Schottkydiode (SD) integration current crowding

Delayed activation of leg somatotopic fibers of an injured corticospinal tract in a patient with cerebral infarction

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Neural Regeneration Research 2022年第11期17卷 2551-2552页

作者： Min Jye Cho Sung Ho jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityNamkuDaeguRepublic of Korea

Stroke is a leading cause of major adult disabilities,and motor weakness is one of the most serious disability-related sequelae of *** of the motor recovery in stroke patients is reported to occur within 6months after stroke onset,and this period is deemed critical for motor recovery in stroke(Grefkes and Fink,2020;Olafson et al.,2021).

关键词： cerebral infarction

Diffusion tensor tractography characteristics of axonal injury in concussion/mild traumatic brain injury

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Neural Regeneration Research 2022年第5期17卷 978-982页

作者： Sung Ho jang You Sung Seo Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaeguRepublic of Korea

The main advantage of diffusion tensor tractography is that it allows the entire neural tract to be *** addition,configurational analysis of reconstructed neural tracts can indicate abnormalities such as tearing,narrowing,or discontinuations,which have been used to identify axonal injury of neural tracts in concussion *** review focuses on the characteristic features of axonal injury in concussion or mild traumatic brain injury(m TBI)patients through the use of diffusion tensor *** injury in concussion(m TBI)patients is characterized by their occurrence in long neural tracts and multiple injuries,and these characteristics are common in patients with diffuse axonal injury and in concussion(m TBI)patients with axonal ***,the discontinuation of the corticospinal tract is mostly observed in diffuse axonal injury,and partial tearing and narrowing in the subcortical white matter are frequently observed in concussion(m TBI)patients with axonal *** difference appears to be attributed to the observation that axonal injury in concussion(m TBI)patients is the result of weaker forces than those producing diffuse axonal *** addition,regarding the fornix,in diffuse axonal injury,discontinuation of the fornical crus has been frequently reported,but in concussion(m TBI)patients,many collateral branches form in the fornix in addition to these findings in many case *** is presumed that the impact on the brain in TBI is relatively weaker than that in diffuse axonal injury,and that the formation of collateral branches occurs during the fornix recovery *** the occurrence of axonal injury in multiple areas of the brain is an important feature of diffuse axonal injury,case studies in concussion(m TBI)have shown that axonal injury occurs in multiple neural *** axonal injury lesions in m TBI patients may persist for approximately 10 years after injury onset,the characteristics of axonal injury in co

关键词： axonal injury brain injury concussion diffusion tensor imaging diffusion tensor tractography mild traumatic brain injury neural tract

Advent of torsional optomechanics from Beth’s legacy

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Advanced Photonics 2023年第4期5卷 3-4页

作者： jaehyuck jang Jungho Mun Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Torsional optomechanics,which involves the transfer of angular mo-mentum from light to matter,has been a vibrant research area since Beth’s pioneering contribution in *** proposed a method to measure the transfer of spin angular momentum using a torsional pen-dulum,1 laying the foundation for classical and quantum optomechanics related to particle levitation,trapping,and cooling in modern optics.

关键词： angular optics momentum