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Analysis of optical emission spectroscopy data during silicon etching in SF_(6)/O_(2)/Ar plasma

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Plasma Science and Technology 2021年第12期23卷 117-127页

作者： Dong hwan KIM jeong Eun CHOI Sang Jeen HONG Department of Electronics Engineering Myongji University116 Myongji-roYongin-siGyeonggi-doRepublic of Korea

Silicon etching is an essential process in various applications,and a major challenge for etching process is anisotropic high aspect ratio etching *** etch profile is determined by the plasma parameters and process *** this study,the plasma state with each process parameters were analyzed through the optical emission spectroscopy(OES)plasma diagnostic sensor by both chemical and physical *** temperature and electron density were additionally acquired using the corona model with OES data that provides chemical species information,and the etch profile was evaluated through scanning electron microscope measurement *** results include changes in profile with gas ratio,bias power,and *** figure out that factors like ion energy and ion angular distribution as well as chemical reaction affect the anisotropic profile.

关键词： silicon etching profile optical emission spectroscopy plasma in-formation corona model

冷加工过程中Zr-1Nb板材组织演化研究(英文)

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稀有金属材料与工程 2013年第4期42卷 667-672页

作者：刘彦章 Hyun-Gil Kim jeong-Yong park Yong-hwan jeong 深圳中广核工程设计有限公司广东深圳518057 Korea Atomic Energy Research Institute Daejeon 305-353Republic of Korea

对热轧的Zr-1Nb板材进行了不同变形量的冷加工,利用背散射电子衍射(EBSD)以及透射电子显微镜(TEM)研究了冷加工及热处理对其组织的影响。结果表明,随着冷加工变形量从30%增加到70%,晶粒尺寸逐渐从双态分布变为均匀分布。各种变形下的织... 详细信息

对热轧的Zr-1Nb板材进行了不同变形量的冷加工,利用背散射电子衍射(EBSD)以及透射电子显微镜(TEM)研究了冷加工及热处理对其组织的影响。结果表明,随着冷加工变形量从30%增加到70%,晶粒尺寸逐渐从双态分布变为均匀分布。各种变形下的织构主要为(0001),且随着变形道次的增加强度逐渐增大。

关键词： Zr-1Nb 冷轧和退火组织演化背散射电子衍射

Optical Properties of Zinc-Blende InGaN/GaN Quantum Well Structures and Comparison with Experiment

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Chinese Physics Letters 2010年第4期27卷 136-139页

作者： park Seoung-hwan LEE Yong-Tak Department of Electronics Engineering Catholic University of Daegu Hayang Kyeongsan Kyeongbuk 712- 702 Republic of Korea Department of Information and Communications Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Republic of Korea

Optical properties of zinc-blende InGaN/GaN Q W structures are investigated using the multiband effective-mass theory. The transition wavelength values at 300 K ranged from 440 to 570nm in the investigated range of the In composition and the well width. The theoretical wavelengths show reasonable agreement with the experimental results. The optical gain decreases with the increasing well width. This is mainly due to the reduction in the quasi-Fermi-level separation because the optical matrix element increases with the well width.

关键词： Condensed matter: electrical magnetic and optical Surfaces interfaces and thin films Nanoscale science and low-D systems

Wetting Layer Effect on Optical Gain of Strained CdTe/ZnTe Pyramidal Quantum Dots

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Chinese Physics Letters 2010年第9期27卷 233-236页

作者： Seoung-hwan park Woo-Pyo Hong Department of Electronics Engineering Catholic University of Daegu Hayang Kyeongbuk 712-702 Korea

The optical properties of strained CdTe/ZnTe pyramidal quantum dots （QDs） are investigated as a function of the wetting layer thickness using an eight-band strain-dependent k.p Hamiltonian. The ground-state subband energies in the conduction and valence bands rapidly decreases with the increasing wetting layer thickness. This is attributed to the reduction of subband energies in both the conduction and the valence bands due to the strain effect. The optical gain peak on the shorter wavelength side decreases with the increasing wetting layer thickness. On the other hand, the gain peak on the longer wavelength side is nearly independent of the wetting layer thickness. The decrease in the gain peak on the shorter wavelength side is related to the decrease in matrix elements corresponding to transitions between higher subbands such as （3, 4） and （4, 3）.

关键词： Thickness Layering Energy Sides

Mechanical, deformation and fracture behaviors of bulk metallic glass composites reinforced by spherical B2 particles

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Progress in Natural Science:Materials International 2018年第6期28卷 704-710页

作者： Sung hwan Hong jeong Tae Kim Jin Man park Gian Song Wei-Min Wang Ki Buem Kim Department of Nanotechnology and Advanced Materials Engineering Sejong University Erich Schmid Institute of Materials Science Austrian Academy of Sciences Global Technology Center (GTC) Samsung Electronics Co. Ltd. 4. Division of Advanced Materials Engineering Kongju National University 5. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministy of Education Shandong University

Ti45Cu40Ni7Zr5Sn2.5Si0.5alloys were prepared under various cooling rate conditions during *** alloys exhibited different volume fractions of B2 particles with 0～40 vol%in an amorphous *** bulk metallic glass of 1 mm diameter showed no macroscopic plasticity and exhibited the typical vein patterns in a maximum shear stress plane on the fracture ***,a bulk metallic glass composite containing the B2 particles revealed obvious plasticity(～5.6%)with a remarkable work-hardening behavior that resulted from a stress-induced martensitic transformation of the B2 ***,the composite displayed the complicated fracture morphologies containing of three types of fracture *** detailed investigations on the microstructural evolution,mechanical,deformation and fracture characteristics,the influence of B2 particle on overall behavior of the TiCu-based bulk metallic glass composites was elucidated.

关键词： Bulk metallic glass Composite Mechanical properties Martensitic transformation Fracture behavior

Consistency of intensity ratio between spectral lines with similar self-absorption characteristics during ungated laser induced breakdown spectroscopy measurements

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Plasma Science and Technology 2019年第3期21卷 77-83页

作者： Jung-hwan IN Youngmin MOON Jang-Hee CHOI Sungho jeong Optical Lens Research Center Korea Photonics Technology Institute School of Mechanical Engineering Gwangju Institute of Science and Technology

This work reports that the intensity ratio of spectral lines having similar self-absorption characteristics during laser induced breakdown spectroscopy(LIBS) analysis can become nearly constant over a wide range of irradiation conditions if the intensities are integrated over a sufficiently long time. It is shown that the plasma temperature and intensity ratio of these spectral lines have temporal similarity. The spectral lines with similar self-absorption properties may be selected to improve the accuracy and consistency of LIBS analysis results under an environment with fluctuating measurement conditions.

关键词： laser induced breakdown spectroscopy intensity ratio self-absorption characteristics CIGS solar cell

Recovery of brachial plexus injury after bronchopleural fistula closure surgery based on electrodiagnostic study:A case report and review of literature

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World Journal of Clinical Cases 2022年第30期10卷 11090-11100页

作者： Young-In Go Da-Sol Kim Gi-Wook Kim Yu Hui Won Sung-Hee park Myoung-hwan Ko jeong-hwan Seo Department of Physical Medicine&Rehabilitation Jeonbuk National University Medical SchoolJeonju 54907South Korea Research Institute of Clinical Medicine of Jeonbuk National University Biomedical Research Institute of Jeonbuk National University HospitalJeonju 54907South Korea

BACKGROUND Axillary thoracotomy and muscle flap are muscle-and nerve-sparing methods among the surgical approaches to bronchopleural fistula(BPF).However,in patients who are vulnerable to a nerve compression injury,nerve injury may *** this report,we present a unique case in which the brachial plexus(division level),suprascapular,and long thoracic nerve injury occurred after BPF closure surgery in a patient with ankylosing spondylitis and concomitant multiple joint *** SUMMARY A 52-year-old man with a history of ankylosing spondylitis with shoulder joint contractures presented with right arm weakness and sensory impairment immediately after axillary thoracotomy and latissimus dorsi muscle flap surgery for BPF *** the surgery,the patient was positioned in a lateral decubitus position with the right arm hyper-abducted for approximately 6 *** resonance imaging and ultrasound revealed subclavius muscle injury or myositis with brachial plexus(BP)compression and related *** electrodiagnostic study confirmed the presence of BP injury involving the wholedivision level,long thoracic,and suprascapular nerve *** was treated with medication,physical therapy,and ultrasound-guided *** steroid injection at the BP,hydrodissection with 5%dextrose water at the BP and suprascapular nerve,and intra-articular steroid and hyaluronidase injection at the glenohumeral joint were *** postoperative day 194,the pain and arm weakness were resolved,and a follow-up electrodiagnostic study showed marked *** Clinicians should consider the possibilities of multiple nerve injuries in patients with joint contracture,and treat each specific therapeutic target.

关键词： Brachial plexus Electrodiagnosis Physical therapy Surgical flaps Thoracotomy Case report

Self-expandable metal stents for choledocholithiasis in Billroth II gastrectomy patients

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Hepatobiliary & Pancreatic Diseases International 2018年第6期17卷 546-552页

作者： Min-Gui Han Eunae Cho Chang-hwan park Chung-hwan Jun Seon-Young park Division of Gastroenterology Department of Internal MedicineChonnam National University Hospital42Jaebong-roDong-KuGwangju 61482Korea

Background: Efficient ampullary intervention is essential for endoscopic retrograde cholangiopancreatography(ERCP) in patients with a prior Billroth II gastrectomy. We retrospectively evaluated the safety and effectiveness of ampullary intervention using fully covered self-expandable metal stents(FCSEMSs) for the management of common bile duct(CBD) stones in a subset of patients with a history of Billroth II gastrectomy. Methods: This retrospective analysis involved patients with a prior Billroth II gastrectomy who underwent ampullary intervention with FCSEMSs for the management of CBD stones. The factors associated with FCSEMSs placement, treatment success, and procedural complications were analyzed. Results: A group of 15 patients(10 males; median age, 78 years) underwent biliary metal stent placement for high degree of CBD angulation(6), small or flat papilla with unclear margin(5), current use of double antiplatelet agents or an anticoagulant(2), unwanted instrumentation of the cystic duct(1), and insecure position of the scope(1). Ampullary intervention with FCSEMSs was successful in all patients. After dilating the ampulla of Vater and building a durable conduit with FCSEMSs immediately, CBD stones were removed successfully from all patients in a single session. A mild post-ERCP pancreatitis occurred in one patient, who recovered without complications. Conclusion: Ampullary intervention with FCSEMSs is safe and effective for the management of CBD stones in a subset of patients with a history of Billroth II gastrectomy.

关键词： Common bile duct stone Endoscopic retrograde cholangiopancreatography Stent placement Stone extraction

Therapeutic effect of acupuncture point injection with placental extract in knee osteoarthritis

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Journal of Integrative Medicine 2017年第2期15卷 135-141页

作者： Kyeong Mee park Tae hwan Cho Inno Oriental Clinic Daejon 34014 South Korea Cho Orthopaedic Clinic Seoul 06643 South Korea

OBJECTIVE： This study evaluated the effectiveness of acupuncture point injection （API） with placenta extract on pain reduction and joint function in patients with knee osteoarthritis （OA）. METHODS： Fifty-two patients with knee OA, with an average age of 64, and having a symptom duration of more than 3 months were studied in this report. Placental extract was injected weekly into acupuncture point ST35, BL23, BL24 and BL25 for 5 weeks; 8 mL of placental extract into ST35 on the affected side, and 1 mL of placental extract to BL23, BL24 and BL25 bilaterally. RESULTS： After a five-week treatment of API with placental extract, pain was substantially decreased in patients of all Kellgren-Lawrence （KL） grades. Improvement of knee joint swelling was also apparent Decrease of pain and joint swelling improved daily working productive time among patients of all KL grades. CONCLUSION： Study results imply that API with placental extract is a potentially useful therapy to control pain and maintain joint functions in knee OA patients.

关键词： osteoarthritis, knee acupuncture point injection placental extracts pain swelling productive time