http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Eunsoo NAM,Dong Yun JUNG,Myoung Sook OH 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We describe a 100 GHz waveguide InGaAs/InP p-i-n photodiode based on multimode waveguide structure. The measured background carrier concentration in the unintentionally doped In0:53Ga0:47As absorption layer is as low as 1015 cm
Anion Extraction-Induced Polymorph Control of Transition Metal Dichalcogenides
Nam, Dae-Hyun,Kim, Ji-Yong,Kang, Sungwoo,Joo, Wonhyo,Lee, Seung-Yong,Seo, Hongmin,Kim, Hyoung Gyun,Ahn, In-Kyoung,Lee, Gi-Baek,Choi, Minjeong,Cho, Eunsoo,Kim, Miyoung,Nam, Ki Tae,Han, Seungwu,Joo, You American Chemical Society 2019 NANO LETTERS Vol.19 No.12
<P>Controlled phase conversion in polymorphic transition metal dichalcogenides (TMDs) provides a new synthetic route for realizing tunable nanomaterials. Most conversion methods from the stable 2H to metastable 1T phase are limited to kinetically slow cation insertion into atomically thin layered TMDs for charge transfer from intercalated ions. Here, we report that anion extraction by the selective reaction between carbon monoxide (CO) and chalcogen atoms enables predictive and scalable TMD polymorph control. Sulfur vacancy, induced by anion extraction, is a key factor in molybdenum disulfide (MoS<SUB>2</SUB>) polymorph conversion without cation insertion. Thermodynamic MoS<SUB>2</SUB>-CO-CO<SUB>2</SUB> ternary phase diagram offers a processing window for efficient sulfur vacancy formation with precisely controlled MoS<SUB>2</SUB> structures from single layer to multilayer. To utilize our efficient phase conversion, we synthesize vertically stacked 1T-MoS<SUB>2</SUB> layers in carbon nanofibers, which exhibit highly efficient hydrogen evolution reaction catalytic activity. Anion extraction induces the polymorph conversion of tungsten disulfide (WS<SUB>2</SUB>) from 2H to 1T. This reveals that our method can be utilized as a general polymorph control platform. The versatility of the gas-solid reaction-based polymorphic control will enable the engineering of metastable phases in 2D TMDs for further applications.</P> [FIG OMISSION]</BR>
Nam, Jaekwang,Lee, Wonseo,Jung, Eunsoo,Jang, Gunhee Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.7
<P>We propose a novel closed-circuit magnetic navigation system (CMNS), which utilizes eight electromagnets connected by back yokes to maximize a magnetic field. We first show the effectiveness of a closed magnetic circuit (CMC) and conduct a parametric analysis to design a single CMC, which is utilized to construct the whole CMNS. A magnetic field mapping method is also developed utilizing the finite-element method and polynomial regression to evaluate and control the magnetic field over almost the whole workspace in real time. We investigated how the magnetic field changed based on the shape of core tips by comparing the isotropic magnetic field control authority, which is the ability to generate an equal magnetic field over the workspace regardless of the position and direction of the magnetic field. We experimentally verified the mathematical assumption that the magnetic field generated from the proposed CMNS can be linearly proportional to the applied current and that the magnetic field of the proposed CMNS can be expressed as a superposition of the magnetic fields generated by each electromagnet. Finally, we verified the effectiveness of the developed CMNS by performing experiments related to steering a commercial magnetic catheter.</P>
( Eunsoo Kim ),( Won Chul Shin ),( Sang Min Lee ),( Min Jun Choi ),( Nam Hoon Moon ) 대한고관절학회 2023 Hip and Pelvis Vol.35 No.2
The aim of this study was to conduct a meta-analysis of randomized controlled trials (RCTs) for comparison of the effectiveness of pericapsular nerve group (PENG) block with that of other analgesic techniques for reduction of postoperative pain and consumption of opioids after total hip arthroplasty (THA). A search of records in the PubMed, Embase, and Cochrane Library, and ClinicalTrials.gov databases was conducted in order to identify studies comparing the effect of the PENG block with that of other analgesics on reduction of postoperative pain and consumption of opioids after THA. Determination of eligibility was based on the PICOS (participants, intervention, comparator, outcomes, and study design) criteria as follows: (1) Participants: patients who underwent THA. (2) Intervention: patients who received a PENG block for management of postoperative pain. (3) Comparator: patients who received other analgesics. (4) Outcomes: numerical rating scale (NRS) score and opioid consumption during different periods. (5) Study design: clinical RCTs. Five RCTs were finally included in the current meta-analysis. Significantly lower postoperative opioid consumption at 24 hours after THA was observed in the group of patients who received the PENG block compared with the control group (standard mean difference=- 0.36, 95% confidence interval -0.64 to -0.08). However, no significant reduction in NRS score at 12, 24, and 48 hours after surgery and opioid consumption at 48 hours after THA was observed. The PENG block showed better results for opioid consumption at 24 hours after THA compared with other analgesics.
Visual object detection 기반 의수 제어
신은수(Eunsoo Shin),최태환(Taehwan Choi),나재영(Jayeong Na),유다영(Dayoung You),이회림(Hoirim Lee),임철용(Chulyong Lim),남우철(Woochul Nam) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Most prosthetic hands cannot automatically control their gripping motions according to target objects; users need to manually select gripping motion. To address this problem, this study integrated a vision system with the prosthetic hand to autonomously detect an object to grip and conduct a suitable grip motion. The users vision was replaced with a laser pointer and mini-cam. The user needs to indicate a target object with the laser pointer. Then, the object detection model (Scaled-YOLOv4) discerns the object class and determines the gripping motion corresponding to the class. To improve the object detection accuracy, various image processing methods are applied to the detection model. Moreover, a public robot hand design (Handi-hand) was significantly modified to realize precise and robust grip motions. Actuators, joints, and stiffness components in the robot fingers were replaced with different devices for high gripping performance, and the part design was changed accordingly. The unmovable wrist was also changed to an active wrist that is controlled by a servo motor. The gripping time was determined by the user’s electromyography signals. In experiments, this prosthetic hand successfully grasped four different objects.
Visual object detection 기반 의수 제어
신은수(Eunsoo Shin),최태환(Taehwan Choi),나재영(Jayeong Na),유다영(Dayoung You),이회림(Hoirim Lee),임철용(Chulyong Lim),남우철(Woochul Nam) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Most prosthetic hands cannot automatically control their gripping motions according to target objects; users need to manually select gripping motion. To address this problem, this study integrated a vision system with the prosthetic hand to autonomously detect an object to grip and conduct a suitable grip motion. The users vision was replaced with a laser pointer and mini-cam. The user needs to indicate a target object with the laser pointer. Then, the object detection model (Scaled-YOLOv4) discerns the object class and determines the gripping motion corresponding to the class. To improve the object detection accuracy, various image processing methods are applied to the detection model. Moreover, a public robot hand design (Handi-hand) was significantly modified to realize precise and robust grip motions. Actuators, joints, and stiffness components in the robot fingers were replaced with different devices for high gripping performance, and the part design was changed accordingly. The unmovable wrist was also changed to an active wrist that is controlled by a servo motor. The gripping time was determined by the user’s electromyography signals. In experiments, this prosthetic hand successfully grasped four different objects.
Confining jackets for concrete cylinders using NiTiNb and NiTi shape memory alloy wires
Choi, Eunsoo,Nam, Tae-Hyun,Yoon, Soon-Jong,Cho, Sun-Kyu,Park, Joonam Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>This study used prestrained NiTiNb and NiTi shape memory alloy (SMA) wires to confine concrete cylinders. The recovery stress of the wires was measured with respect to the maximal prestrain of the wires. SMA wires were preelongated during the manufacturing process and then wrapped around concrete cylinders of 150 mm×300 mm (&phis;×<I>L</I>). Unconfined concrete cylinders were tested for compressive strength and the results were compared to those of cylinders confined by SMA wires. NiTiNb SMA wires increased the compressive strength and ductility of the cylinders due to the confining effect. NiTiNb wires were found to be more effective in increasing the peak strength of the cylinders and dissipating energy than NiTi wires. This study showed the potential of the proposed method to retrofit reinforced concrete columns using SMA wires to protect them from earthquakes.</P>