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Search Results: 1 - 10 of 25288 matches for " Sungjun Lee "
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Correlation between Serum Neutrophil Gelatinase Associated Lipocalin and Burn Severity: A Pilot Study  [PDF]
Sungjun Lee, Suyeol Lee, Youngwhan Choi, Song Vogue Ahn, Cheonjae Yoon, Jungsuk Lee
Journal of Biosciences and Medicines (JBM) , 2017, DOI: 10.4236/jbm.2017.51002
Abstract: The severity of an initial burn injury is critical for determining the treatment plan and prognosis of burn patients. Here, we measured serum neutrophil gelatinase-associated lipocalin (NGAL) levels to determine whether NGAL can be used as a biomarker for severity of burn injuries. A study of the demographic, clinical, and laboratory markers for various organ damage was performed at Bestian Burn Center (n = 10 healthy people, n = 31 patients). NGAL and organ damage marker levels were measured in 31 patients with severe burns within 2 - 3 days following their admission to the intensive care unit. Serum NGAL level of the expired patients was 788.5 (685.0 - 998.0) pg/mL, whereas that of the discharged patients was 421.2 (356.2 - 480.6) pg/mL, showing that the initial serum NGAL level can be used to estimate mortality. We also determined the correlation between serum NGAL level and the currently used severity markers (total body surface area burned and abbreviated burn severity index) and confirmed that serum NGAL level could be used as a severity marker. We also found that serum NGAL level was correlated with damage of organs such as the liver, kidney, heart, and respiratory organs in patients with severe burns.
Neuroendocrine Tumor Arising from Common Bile Duct: A Case Report and Literature Review  [PDF]
Sungjun Hwang, Jung Wook Seo
Advances in Computed Tomography (ACT) , 2017, DOI: 10.4236/act.2017.64005
Abstract:
Neuroendocrine tumor (NET) arising from common bile duct (CBD) is a rare disease entity, whose origin is currently in discussion with various theories. We present a case of well-defined solid, exophytic and arterial hypervascular mass arising from CBD with relatively mild dilated central intrahepatic bile ducts in 50-year-old man, which was surgically confirmed to be extrahepatic biliary NET, and reviewed radiologic features of extrahepatic biliary NET in previous literature.
Quantitative Sasang Constitution Diagnosis Method for Distinguishing between Tae-eumin and Soeumin Types Based on Elasticity Measurements of the Skin of the Human Hand
Han Wook Song,SungJun Lee,Yon Kyu Park,Sam Yong Woo
Evidence-Based Complementary and Alternative Medicine , 2009, DOI: 10.1093/ecam/nep097
Abstract: The usefulness of constitutional diagnoses based on skin measurements has been established in oriental medicine. However, it is very difficult to standardize traditional diagnosis methods. According to Sasang constitutional medicine, humans can be distinguished based on properties of the skin, including its texture, roughness, hardness and elasticity. The elasticity of the skin was previously used to distinguish between people with Tae-eumin (TE) and Soeumin (SE) constitutions. The present study designed a system that uses a compression method to measure the elasticity of hand skin and evaluated its measurement repeatability. The proposed system was used to compare the skin elasticity between SE and TE subjects, which produced a measurement repeatability error of <3%. The proposed system is suitable for use as a quantitative constitution diagnosis method for distinguishing between TE and SE subjects with an acceptable level of uncertainty.
High Speed Friction Microscopy and Nanoscale Friction Coefficient Mapping
James L. Bosse,Sungjun Lee,Bryan D. Huey,Andreas S? Andersen,Duncan S. Sutherland
Physics , 2014, DOI: 10.1088/0957-0233/25/11/115401
Abstract: As mechanical devices in the nano/micro length scale are increasingly employed, it is crucial to understand nanoscale friction and wear especially at technically relevant sliding velocities. Accordingly, a novel technique has been developed for Friction Coefficient Mapping (FCM), leveraging recent advances in high speed AFM. The technique efficiently acquires friction versus force curves based on a sequence of images at a single location, each with incrementally lower loads. As a result, true maps of the coefficient of friction can be uniquely calculated for heterogeneous surfaces. These parameters are determined at a scan velocity as fast as 2 mm/s for microfabricated SiO2 mesas and Au coated pits, yielding results that are identical to traditional speed measurements despite being ~1000 times faster. To demonstrate the upper limit of sliding velocity for the custom setup, the friction properties of mica are reported from 200 {\mu}m/sec up to 2 cm/sec. While FCM is applicable to any AFM and scanning speed, quantitative nanotribology investigations of heterogeneous sliding or rolling components are therefore uniquely possible, even at realistic velocities for devices such as MEMS, biological implants, or data storage systems.
Technical Analysis of Exoskeleton Robot  [PDF]
Sungjun Yeem, Jinyeong Heo, Hongchul Kim, Yongjin Kwon
World Journal of Engineering and Technology (WJET) , 2019, DOI: 10.4236/wjet.2019.71004
Abstract: Recently, the need for exoskeleton robots has been increased due to the advancement of robotic technologies and changes in the concept of how the robots can be utilized in direct contact with human bodies. The robots, once only used on the factory floor, are now becoming a part of human bodies, which provides the unprecedented level of muscle power boost and the increase of running speed. If used very carefully, the exoskeleton robots can be also used for patients’ rehabilitation. The exoskeleton robots have many potential application areas;?hence most advanced countries are currently developing various types of exoskeleton robots. Those robots can be classified into two major categories, namely the rigid type and the soft type. Each type has own advantages and disadvantages, while the carrying load capacity and the actuation speed can be quite different. There are also many technical difficulties in order to use the exoskeleton robots in the field. The aim of this study is, therefore, to introduce the trends of exoskeleton robot development in advanced countries, while providing the analysis on the technical merits and downside of robot types. The comparison chart also indicates the major technical directions, in which the future technology will be headed for, such as the improved robot response characteristics by employing advanced sensors and artificial intelligence. The robots are becoming smarter, lighter, and more powerful. It is foreseeable that the wearable robots can be a part of human life in the very near future.
Study on the Compressive Modulus of Nylon-11/Silica Nanocomposites
Haseung Chung,Sungjun Kong,Dongchoul Kim
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/615489
Abstract: This paper investigates the unusual characteristics regarding the mechanical properties of Nylon-11 filled with different volume fractions of silica nanoparticles by selective laser sintering (SLS) from numerical simulation. The compressive modulus was predicted by two different numerical models and compared with the experimentally measured one. While the two-phase model has a limited capability in explaining the unusual behavior shown in the compressive modulus obtained by experiments with 2% volume fraction of nanoparticles, the effective interface model can simulate the unexpected characteristic of nanocomposites according to the volume fraction of nanoparticles. We can conclude that the effective interface model should be employed to predict the mechanical properties of nanocomposites for efficiency and accuracy.
Adiabatic quantum pumping of a desired ratio of spin current to charge current
Sungjun Kim,Kunal K. Das,Ari Mizel
Physics , 2005, DOI: 10.1103/PhysRevB.73.075308
Abstract: We present a prescription for generating pure spin current or spin selective current, based on adiabatic quantum pumping in a tight-binding model of a one dimensional conductor. A formula for the instantaneous pumped current is derived without introducing the scattering matrix. Our calculations indicate that some pumping cycles produce the maximum value 2 of pumped spin while others reverse the direction of current as a result of small alterations of the pumping cycle. We find pumping cycles which produce essentially any ratio of spin current to charge current.
Controlled Flow of Spin-Entangled Electrons via Adiabatic Quantum Pumping
Kunal K. Das,Sungjun Kim,Ari Mizel
Physics , 2005, DOI: 10.1103/PhysRevLett.97.096602
Abstract: We propose a method to dynamically generate and control the flow of spin-entangled electrons, each belonging to a spin-singlet, by means of adiabatic quantum pumping. The pumping cycle functions by periodic time variation of localized two-body interactions. We develop a generalized approach to adiabatic quantum pumping as traditional methods based on scattering matrix in one dimension cannot be applied here. We specifically compute the flow of spin-entangled electrons within a Hubbard-like model of quantum dots, and discuss possible implementations and identify parameters that can be used to control the singlet flow.
Adiabatic quantum pumping in an Aharonov-Bohm loop and in a Si-like nanowire: Role of interference in real space and in momentum space
Sungjun Kim,Kunal K. Das,Ari Mizel
Physics , 2006, DOI: 10.1103/PhysRevB.76.085307
Abstract: We study the consequences of interference effects on the current generated by adiabatic quantum pumping in two distinct one-dimensional (1D) lattice model. The first model contains an Aharonov-Bohm (AB) loop within a tight-binding chain of lattice sites. The static AB phase is shown to strongly affect interference between the two arms of the loop, serving as an on-off switch and regulator for the pumped current. The second model simulates pumping in semiconductors with indirect band-gaps, by utilizing a tight-binding chain with next-nearest-neighbor coupling. The model exhibits signatures of interference between degenerate conduction band states with different Fermi wavevectors.
Renal-Adenocarcinoma-Associated Erythrocytosis in a Cat
Sungjun Noh, Ji-Houn Kang*, Gonhyung Kim, Dongwoo Chang, Byeongwoo Ahn, Ki-Jeong Na and Mhan-Pyo Yang
Pakistan Veterinary Journal , 2013,
Abstract: A 9-year-old spayed female domestic shorthair cat was referred for erythrocytosis. Even after the correction of dehydration, blood analyses showed that there had been no improvement. An abdominal ultrasonography and computed tomography identified the presence of a mass on the left kidney. Measurement of serum erythropoietin (EPO) showed higher concentration than the reference interval. These findings suggested a direct association of the erythrocytosis with excessive EPO production. The cat underwent nephrectomy of the affected (left) kidney. Subsequent histopathology was consistent with a diagnosis of renal adenocarcinoma. Following the nephrectomy, serum EPO concentrations decreased gradually, and the erythrocytosis resolved 15 days postoperatively. This case describes the diagnosis and treatment of secondary inappropriate erythrocytosis in a cat with renal adenocarcinoma.
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