• Journal of Korea Multimedia Society
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• v.22 no.11
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• pp.1269-1279
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• 2019

In medical image analysis, segmentation is considered as a vital process since it partitions an image into coherent parts and extracts interesting objects from the image. In this paper, we consider automatic segmentations of OCT retinal images to find six layer boundaries using convolutional neural networks. Segmenting retinal images by layer boundaries is very important in diagnosing and predicting progress of eye diseases including diabetic retinopathy, glaucoma, and AMD (age-related macular degeneration). We applied well-known CNN architecture for general image segmentation, called Segnet, U-net, and CNN-S into this problem. We also proposed a shortest path-based algorithm for finding the layer boundaries from the outputs of Segnet and U-net. We analysed their performance on public OCT image data set. The experimental results show that the Segnet combined with the proposed shortest path-based boundary finding algorithm outperforms other two networks.

• The Journal of Korean Physical Therapy
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• v.13 no.1
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• pp.219-227
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• 2001

Capsaicin. a vanillyl amide(8-methy1-N-vanilly1-6-nonenamide) with a molecular weight of 305.42, was substance, interrupting the pain conducting pathway Until recently the neurotoxic effects of Capsaicin to adult animals were thought to be limited to the peripheral nervous system. But several reports suggest the possibility of central nervous system changes after Capsaicin administration to the adult rat. Capsaicin desensitization is defined as long lasting, reversible suppression of sensory neuron activity. How fast and for how long the desensitization develops is related to the dose and time of exposure to Capsaicin, and the interval between consecutive dosing. In the long term Capsaicin treatment can lead to morphological degeneration and changes in some small sensory neurons, predominantly unmyelinated C fiber afferent nerve fibers. Clinical interest has recently been roused by evidence that Capsaicin's desensitizing action may be of therapeutic value and that an endogenous Capsaicin-1 ike substance may exist. This study summarizes the fundamental knowledge(mechanism, receptors, et al of Capsaicin) of Capsaicin for physical therapists.

• Korean Journal of Veterinary Research
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• v.39 no.2
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• pp.359-364
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• 1999

We investigated the pathological changes in young rabbits which were experimentally infected with rabbit hemorrhagic disease virus (RHDV). Experimental infection of RHDV was carried out in both thymectomized and non-thymectomized young immature rabbits and adult rabbits. None of young rabbits infected with RHDV died during the experiment. Histologically, single or focal hepatocellular degeneration and necrosis with mild lymphocyte infiltration were observed in the rabbits killed at 30 hours and 5 days PI. Lymphocyte infiltration was more severe at 5 days PI than at 30 hours PI. RHDV antigens were mainly detected in the degenerating hepatocytes adjacent to the infiltrated lymphocytes at 30 hours PI and 5 days PI. In electron microscopical observation, infiltrated lymphocytes in the lesions had large nuclei without cytoplasmic granules and interdigitated with adjacent hepatocytes. It is assumed that infiltrated lymphocytes in hepatic lesions in RHDV infected young rabbits are T-lymphocytes and originate from peripheral lymphoid organs or tissues rather than from thymus.

• The Journal of Internal Korean Medicine
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• v.15 no.2
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• pp.305-317
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• 1994

To study the effect of Kamidaebotang on the hypothyroidism induced by thiourea in SD(Splague Dawley) rats, the weight of thyroid gland, the level of serum $T_3\;and\;T_4$. total cholesterol, hematological changes and histopathological findings were measured. The following results were obtained. 1. Thyroid gland weight of the Kamidaebotang B treated group was significantly increased as compared with that of control group(p<0.05). 2. The level of serum $T_3$ of the Kamidaebotang B treated group was slightly increased as compared with that of control group. But no significant changes appeared between two groups. 3. The level of serum $T_4$ of the Kamidaebotang A, B treated groups were significantly increased as compared with that of control group(p<0.05). 4. Total cholesterol of the Kamidaebotang A, B treated groups were not significant changes as compared with that of control group. 5. Hematological data of the Kamidaebotang A, B treated groups were not significant changes as compared with that of control group. 6. Histopathologically, Kamidaebotang B administration recovered effectly the dystropy, degeneration of thyroid follicle induced by thiourea. From above results, it is suggested that Kamidaebotang B is available to the hypothyroidism induced by thiourea in rats. Therefore, Kamidabotang B seems to be applicable to hypothyroidism in clinical practice.

• Korean Journal of Bronchoesophagology
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• v.4 no.2
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• pp.182-187
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• 1998

Platelet activating factor (PAP) has been known as implicating as one of potent inflammatory mediators and reported 0 be involved in inflammation and allergy. PAF induces ciliary dysfunction and epithelial damage of human paranasal sinus mucosa in vitro. However, several recent papers have reported that PAF may not readily damage the airway epithelium. The aim of this study was to investigate the ultrastructural evidence to elucidate the pathogenesis of epithelial damage induced by PAF. Sixteen $\mu\textrm{g}$ g of PAF was applied into the maxillary sinuses of 6 rabbits. Rabbits were divided into 2 subgroups along with time interval at 1st and 3rd experimental day, and sinus mucosae were taken for the histopathologic study using electron microscopy. At 1st day, epithelial cells showed no ultrastructural change. Ultrastructures of the cilia were well preserved. Subepithelial space showed no evidence of the infiltration of inflammatory cells. Intravascular platelet aggregation and swelling of endothelial cells were evident. At 3rd day, epithelial cells showed vacuolar degeneration. Fusion of cilia forming giant cilia and focal loss of cilia were evident. Eosinophils were infiltrated in subepithelial and intraepithelial space. Swelling of endothelial cells, and migration of inflammatory cells into the connective tissue were evident. This study implies that epithelial damage induced by PAF may be secondary to the cytotoxicity of mobilized eosinophils rather than direct cytotoxicity of PAF.

• Clinical and Experimental Reproductive Medicine
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• v.20 no.1
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• pp.19-29
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• 1993

Plasminogen activator (PA)-plasmin system in follicular fluid is involved in the process leading to follicular rupture at ovulation. It is well known that PA is closely associated with cellular differentiation and tissue remodeling on evidences from the study of normal and malignant tissues. This study was designed to ascertain a potential role of PA in the ovarian folliculogenesis. Immature Sprague-Dawley rats were injected with pregnant mare serum gonadotropin, followed by injection of serine protease inhibitor (SPI; mixture of 1 mol/L benzamidine and 1 mol/L amino-caproic acid) into the unilateral ovarian bursa. In the control study, mechanical effect of bursal injection and contralateral ovarian effect SPI were ruled out. Total antral follicular areas relative to total ovarian cross-sectional areas was siginificantly lower in SPI-injected ovary than in saline-injected ovary. SPI injection decreased the relative antral follicular area by 33 % respectively. Electron microscopic finding of granulosa cell in the atretic follicle showed the presence of pyknotic nucleus, blurring of neucleolemma, degeneration of mitochondria and dilation of endoplasmic reticulum. After induction of ovulation with hCG, the number of oocytes released was significantly decreased in SPI-injected oviduct than in saline-injected oviduct. From above results, author discussed that PA may play a role not only in ovulation but also in some processes of folliculogenesis.

• Radiation Oncology Journal
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• v.12 no.3
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• pp.285-293
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• 1994

Purpose : The study was designed to investigate the effect of cis-dichlorodiammineplatinum(II)(cis-DDP) on the radiation-induced cardiomyopathy in the rat. Materials and Methods : The myocardial damage was assessed by histopathologic changes. In radiation alone group, radiation dose ranged from 10-40 Gy X-ray in a single dose and in combined group, cis-dichlorodiammineplatinum(II) at a dose of 6 mg/kg was given intraperitoneally immediately after irradiation of same dose with X-ray alone group. Results : The early changes by radiation included congestion, inflammatory cell infiltrations and fibrosis in myocardial interstitium with focal myocardial necrosis, which was noted in 10 Gy group, Myocardial fibrosis was increased by increasing dose of radiation but myocardial necrosis was not Proportional to radiation dose. cis-DDP alone group showed minimal degeneration of myocardium with surrounded by inflammatory cell infiltrations. In combined group, myocardial fibrosis in 10 Gy group were similar to radiation alone group, but 30 Gy and 40 Gy groups showed severer changes. Electron microscopic examination showed disruption of Z-band and edema of mitochondria with decreased matrix density in 20 Gy radiation group which were severer in 40 Gy radiation group. Combined group showed endothelial changes and disruption of Z-band worse than radiation alone group as well as increased connective tissue, which was considered as a hallmark of late change in radiation-induced heart disease. Conclusion : This results showed minimal enhancement of the radiation-induced cardiomyopathy in rats by cis-DDP.

• Clinical and Experimental Pediatrics
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• v.45 no.10
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• pp.1278-1282
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• 2002

Glutaric aciduria(type 1) is characterized clinically by progressive dystonia and dyskinesia in childhood, pathologically by degeneration of caudate and putamen, biochemically by tissue deficiency of glutaryl-CoA dehydrogenase(GCDH), and is transmitted as an autosomal recessive traits. Mutations of the GCDH gene on chromosome 19 have been implicated in the causation of glutaric aciduria(type 1). Macrocephaly in infancy and crossing of percentiles for head circumference are real clues to early diagnosis. Acute neuroregression of dystonia following an initial phase of normal or almost normal development is a common mode of presentation, at times preceded by seizures. We experienced a case of glutaric aciduria(type 1) in a 13-month old girl. She was admitted due to development delay and choreoasthetoid movememt that developed after generalized tonic-clonic type seizures. She was diagnosed as having glutaric aciduria(type 1) based on brain MRI and urine organic acid analysis finding.

• BMB Reports
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• v.41 no.8
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• pp.560-567
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• 2008

The importance of lipids in cell signaling and tissue physiology is demonstrated by the many CNS pathologies involving deregulated lipid metabolism. One such critical metabolic event is the activation of phospholipase $A_2$ ($PLA_2$), which results in the hydrolysis of membrane phospholipids and the release of free fatty acids, including arachidonic acid, a precursor for essential cell-signaling eicosanoids. Reactive oxygen species (ROS, a product of arachidonic acid metabolism) react with cellular lipids to generate lipid peroxides, which are degraded to reactive aldehydes (oxidized phospholipid, 4-hydroxynonenal, and acrolein) that bind covalently to proteins, thereby altering their function and inducing cellular damage. Dissecting the contribution of $PLA_2$ to lipid peroxidation in CNS injury and disorders is a challenging proposition due to the multiple forms of $PLA_2$, the diverse sources of ROS, and the lack of specific $PLA_2$ inhibitors. In this review, we summarize the role of $PLA_2$ in CNS pathologies, including stroke, spinal cord injury, Alzheimer's, Parkinson's, Multiple sclerosis-Experimental autoimmune encephalomyelitis and Wallerian degeneration.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.20 no.3
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• pp.63-67
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• 2012

Spaceflight induces a number of cardiovascular physiological alterations. To study adaptations to microgravity on Earth, the tail-suspended, hindlimb-unloaded rat model has been used to simulate the effects of microgravity. Despite the extensive use of this model to infer physiological adaptations of many organs to microgravity, little information has been obtained on the effect of tail suspension(TS) on cardiac adaptations in the rat. This study was aimed to investigate the effects of simulated microgravity on the rat myocardium using the TS model. Twenty-four male Sprague-Dawley rats were randomly assigned to 3 experimental groups(1, 7 and 14 days of TS) and a control group. A microscopic examination was performed to assess histopathological changes in the myocardial morphology. The hearts from the control group, the 1 day-TS rats and the 7 day-TS rats revealed no evident abnormalities in cardiomyocyte size and morphology. At day 14 of TS, in contrast, the ventricular cardiomyocytes appeared more separated from each other and were slightly smaller in size compared with those of the control group. Also seen were scattered areas exhibiting focal disorganization of muscle fibers and some degenerating cardiomyocytes, of which the nuclei had become pyknotic or disappeared. In this study, we demonstrated that the ventricular cardiomyocytes underwent degeneration and atrophy at the microscopic level during exposure to simulated microgravity in TS rats.