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Recent Progress in Rapid Biosensor Fabrication Methods: Focus on Electrical Potential Application
Yoon Yejin,Kwon Yein,Park Hanbin,Lee Siyun,Park Chulhwan,Lee Taek 한국바이오칩학회 2024 BioChip Journal Vol.18 No.1
The coronavirus disease pandemic has led to an urgent need for rapid and accurate viral diagnosis. Therefore, rapid biosen- sors, not only for viruses but also for the detection of bacteria, disease diagnosis, and environmental monitoring, have been actively researched. Biosensors analyze the binding of biomolecules and target substances mainly based on electrochemical, electrical, or optical methods. To achieve precise and rapid diagnosis, it is crucial to reduce the time required for biomolecule– target substance binding. Typically, biomolecules reach the target substances through random diffusion, and to overcome the limitations associated herewith, biosensors have been integrated with alternating current (AC) electrokinetics (ACEK) technology. ACEK, through the application of alternating voltages, converts electrical energy into fluid motion, inducing pumping, mixing, concentration, and separation of the fluid. Its low power consumption makes it highly promising as a point-of-care diagnostic device. In this paper, we review the advancements in three ACEK technologies: AC electrothermal flow, AC electro-osmosis, and AC di-electrophoresis, to discuss the development of rapid biosensor fabrication methods based on electrical potential applications. The coronavirus disease pandemic has led to an urgent need for rapid and accurate viral diagnosis. Therefore, rapid biosen- sors, not only for viruses but also for the detection of bacteria, disease diagnosis, and environmental monitoring, have been actively researched. Biosensors analyze the binding of biomolecules and target substances mainly based on electrochemical, electrical, or optical methods. To achieve precise and rapid diagnosis, it is crucial to reduce the time required for biomolecule– target substance binding. Typically, biomolecules reach the target substances through random diffusion, and to overcome the limitations associated herewith, biosensors have been integrated with alternating current (AC) electrokinetics (ACEK) technology. ACEK, through the application of alternating voltages, converts electrical energy into fluid motion, inducing pumping, mixing, concentration, and separation of the fl uid. Its low power consumption makes it highly promising as a point-of-care diagnostic device. In this paper, we review the advancements in three ACEK technologies: AC electrothermal flow, AC electro-osmosis, and AC di-electrophoresis, to discuss the development of rapid biosensor fabrication methods based on electrical potential applications.
The Effect of Pulsatility Index on Infarct Volume in Acute Lacunar Stroke
Kim, Yoon,Lee, Hanbin,An, Se-A,Yim, Byeongsoo,Kim, Jonguk,Kim, Ok Joon,Kim, Won Chan,Kim, Hyun Sook,Oh, Seung Hun,Kim, Jinkwon Yonsei University College of Medicine 2016 Yonsei medical journal Vol.57 No.4
<P><B>Purpose</B></P><P>Lacunar stroke, in the context of small vessel disease, is a type of cerebral infarction caused by occlusion of a penetrating artery. Pulsatility index (PI) is an easily measurable parameter in Transcranial Doppler ultrasound (TCD) study. PI reflects distal cerebral vascular resistance and has been interpreted as a surrogate marker of small vessel disease. We hypothesized that an increased PI, a marker of small vessel disease, might be associated with a larger infarct volume in acute lacunar stroke.</P><P><B>Materials and Methods</B></P><P>This study included 64 patients with acute lacunar stroke who underwent TCD and brain MRI. We evaluated the association between the mean PI value of bilateral middle cerebral arteries and infarct volume on diffusion-weighted MRI using univariate and multivariate linear regression.</P><P><B>Results</B></P><P>The mean infarct volume and PI were 482.18±406.40 mm<SUP>3</SUP> and 0.86±0.18, respectively. On univariate linear regression, there was a significant positive association between PI and infarct volume (<I>p</I>=0.001). In the multivariate model, a single standard deviation increase of PI (per 0.18) was associated with an increase of 139.05 mm<SUP>3</SUP> in infarct volume (95% confidence interval, 21.25 to 256.85; <I>p</I>=0.022).</P><P><B>Conclusion</B></P><P>We demonstrated that PI was an independent determinant of infarct volume in acute lacunar stroke. The PI value measured in acute stroke may be a surrogate marker of the extent of ischemic injury.</P>
Magnetic Resonance Findings of a Canine Benign Uveal Melanocytoma
Hyounglok Yoon,Jin Yu,Taegeon An,Hanbin Lee,Hakhyun Kim,Dongwook Kim,Jinhwa Chang,Ji-Houn Kang,Gonhyung Kim,Dongwoo Chang 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.5
A 13-year-old spayed female Beagle dog was referred with high intraocular pressure, hyperemia, andexophthalmos of the left eye and underwent ultrasound, which revealed a mass in the ciliary body of the left eye. Magnetic resonance (MR) imaging was ordered to evaluate invasion of surrounding structures and metastasis to thebrain via the optic nerve. On MR imaging, a single, well-defined, smoothly marginated, triangular-to-oval-shaped masswas found. The mass was hyperintense on T1-weighted images and hypointense on T2-weighted images, similar toa previous case of ocular melanoma. The mass originated from the ciliary body and extended from the anterior chamberto the posterior chamber. Slight enhancement was observed in the mass. There was no evidence of invasion intosurrounding structures or the optic nerve, and no sign of metastasis to the brain. The mass was histopathologicallydiagnosed as benign uveal melanocytoma.
Magnetic Resonance Findings of a Canine Benign Uveal Melanocytoma
Hyounglok Yoon,Taegeon An,Hanbin Lee,Dongwook Kim,Jinhwa Chang,Ji-Houn Kang,Gonhyoung Kim,Dongwoo Chang 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.6
A 13-year-old spayed female Beagle dog was referred with high intraocular pressure, hyperemia, andexophthalmos of the left eye and underwent ultrasound, which revealed a mass in the ciliary body of the left eye. Magnetic resonance (MR) imaging was ordered to evaluate invasion of surrounding structures and metastasis to thebrain via the optic nerve. On MR imaging, a single, well-defined, smoothly marginated, triangular-to-oval-shaped masswas found. The mass was hyperintense on T1-weighted images and hypointense on T2-weighted images, similar toa previous case of ocular melanoma. The mass originated from the ciliary body and extended from the anterior chamberto the posterior chamber. Slight enhancement was observed in the mass. There was no evidence of invasion intosurrounding structures or the optic nerve, and no sign of metastasis to the brain. The mass was histopathologicallydiagnosed as benign uveal melanocytoma.
Popliteal Lymphography in a Dog with Chylothorax
Sohyun Bang,Hanbin Lee,Daehwan Park,Taegeon An,Hyunryung Kim,Jin Yu,Hyunglok Yoon,Gayeon An,Hyejong Oh,Jinhwa Chang,Gonhyung Kim,Dongwoo Chang 한국임상수의학회 2018 한국임상수의학회지 Vol.35 No.6
Signalment: A dog which had been hit by car a month prior and had been experiencing recurrent pleuralchyle effusion was referred to Chung-buk National University Animal Medical Center. The clinical signs includedtachypnea and salivation. Results: Ultrasound-guided popliteal lymphography was performed. The computed tomographyimaging revealed that the thoracic duct was ruptured and the lymph was leaking into the cranial mediastinal region. After this discovery, thoracic duct ligation was performed. The ultrasound-guided popliteal lymphography was repeatedafter the surgery. The second computed tomography imaging revealed that the thoracic duct rupture was resolved. Clinical relevance: We identified the etiology of chylothorax through the computed tomographic lymphography andimaged specific leakage areas. After surgery, the computed tomography imgaing confirmed the lymphatic flowmodification and the treatment was successful.
Foot Measurement Using 3D Scanning Model
Eungyeol Song,Sun-Woong Yoon,Hanbin Son,Sunjin Yu 한국지능시스템학회 2018 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.18 No.3
In a three-dimensional (3D) foot scanning, a 3D point cloud is generated and meshed to create a 3D foot model with depth information. In the previous analog process of foot scanning is to draw an outline of the foot and imitate the foot directly. This method has some disadvantage that has a measurement error, difficult to recreate, inaccuracy of reference point and an error by an expert abilities. In this paper, in-plane deformation measurement method is proposed to solve this problem. In-plane deformation measurement method is a novel method to measure foot size from a 3D foot scanning data. The Shrink-Wrap method is used to reconstruct a foot model, that estimate the foot model by wrapping the surface of a foot of the square template mesh model. For comparison, foot length, foot width and height of the instep is measured with the proposed method. In comparison with handcrafted method, the experimental results show that our proposed method has complexity reduction, higher precision and accurate reproducibility.
Lee, Jayoung,Lee, Ju Hye,Yoon, Hanbin,Lee, Ho Jeong,Jeon, Hosang,Nam, Jiho The Korean Society for Radiation Oncology 2017 Radiation Oncology Journal Vol.35 No.2
Primary liver tumor, especially hepatocellular carcinoma (HCC), is a common cause of cancer death worldwide. The incidence is generally higher in Asian countries than in western countries. Carcinogenesis of HCC is often associated with hepatitis viral infections. Current standard treatment of HCC is surgical resection or transplantation in patients with early stage disease. However, the patient with advanced stage disease, surgical resection is often limited. Sorafenib or other treatment modalities are not so effective as well. We report a case of unusual radiation super-sensitivity in advanced stage HCC, and review the literature.
Jayoung Lee,Ju Hye Lee,Hanbin Yoon,Ho Jeong Lee,Hosang Jeon,Jiho Nam 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.2
Primary liver tumor, especially hepatocellular carcinoma (HCC), is a common cause of cancer death worldwide. The incidence is generally higher in Asian countries than in western countries. Carcinogenesis of HCC is often associated with hepatitis viral infections. Current standard treatment of HCC is surgical resection or transplantation in patients with early stage disease. However, the patient with advanced stage disease, surgical resection is often limited. Sorafenib or other treatment modalities are not so effective as well. We report a case of unusual radiation super-sensitivity in advanced stage HCC, and review the literature.