• Journal of Veterinary Clinics
• /
• v.19 no.3
• /
• pp.363-366
• /
• 2002

Transmissible venereal tumor (TVT) is a contagious, sexually transmitted tumor and, in the natural setting, affects only dogs. We surveyed two cases which were serviced in veterinary medical teaching hospital of Seoul National University. Through this report we studied the method for treatment or n by chemotherapy and surgical resection. in treatment or TVT, surgical resection is not considered an effective method, but chemotherapy and radiation. In these two cases, chemotherapy was very effective and in the second case, there was no effect of surgical method. For treatment of TVT, chemotherapy was very effective, but surgical resection was not recommended.

• Journal of Veterinary Clinics
• /
• v.33 no.2
• /
• pp.122-123
• /
• 2016

A dog (Maltese, 4-year-old, intact male) was referred to the hospital because of the multiple cabbage-shaped nodular masses on penis, preputial fornix and inner layer of prepuce with the free-roaming history. Those appearance was similar with the characteristic of transmissible venereal tumor (TVT). As a result, it was tentatively diagnosed as TVT by the veterinarian of a local clinic and treated with vincristine sulfate. However, the lesion did not regress. Histologically, the mass was consisted of fibrovascular connective tissue stalks and keratinized stratified squamous epithelium, and koilocytosis and intranuclear inclusion body were not shown in the epithelial layer. In addition, inflammatory changes were minimal in the tissue of mass. Based on these findings, this case was diagnosed as venereal squamous papilloma. As the treatments of TVT and papilloma differs, practitioners must be cautious with the diagnosis.

• Journal of Veterinary Clinics
• /
• v.13 no.2
• /
• pp.212-215
• /
• 1996

Chemotherapy of transmissible venereal tumor (TVT) in a dog has been tried, using vincritstine, cyclophosphamide, and methotrexate. The dog was hiven an combination chemotherapy and underwent complete regression of the tumors with on recurrence. The result of our clinical trial indicates that combination chemotherapy is an effective modality for dogs with TVT.

• Korean Journal of Veterinary Pathology
• /
• v.2 no.2
• /
• pp.127-138
• /
• 1998

Transmissible venereal tumor(TVT) is a naturally occurring contagious neoplasm which can be transmitted by mechanical contact during mating in dogs and transplanted as intact viable cells to dogs and other members of canine family such as coyotes, jackals, wolves, and foxes. The incidence of this tumors tends to increase in Korean native Jindo dogs. This is probably due to the high density and unrestrained management system. With time, TVT reaches the maximum size and then tends to regress spontaneously unless individuals are immunologically compromised. It consists of different types of cells depending on the stage. In this study, 10 tumors were selected from Jindo dogs. These were histologically calssified into three stages; progressive, steady-state, and regressive. Mitotic figures were counted, and their histological appearance at each stage is compared with their DNA ploidy. Histologically, 5 tumor cases were calssed as the progressors, 3 cases as the steady-state tumors, and 2 cases as regressors. Progressors were composed of round cells with large nuclei containing conspicuous nucleoli and frequent mitotic figures. A few spindle-shaped cells and inflammatory cells including mainly lymphocytes, a few neutrophils and macrophages were also seen. In the steady-state tumors, there was an increased number of spindle shaped cells and mitotic figures were rare. Six tumors were diploid and four were aneuploid with the variation coefficient of 7.02. Two of five progressive tumors were aneuploid. Two of three steady-state tumors were aneuploid while both tumors at the regressive stage were diploid. Progressive and steady-state tumors had a much larger S/G2M fraction and a higher mitotic index than regressive tumors. Two tumors which persisted for more than one year were aneuploid. These results suggest that the progressive and steady-state tumors had more active cell division than the regressive neoplasms.

• The Journal of Korean Society for Radiation Therapy
• /
• v.15 no.1
• /
• pp.11-18
• /
• 2003

The concrete is usually used to build a radiation therapy facility and the enough concrete thickness for high energy x-ray beam is about 1 meter. But if the space is not enough to build a radiation therapy facility with concrete, the substitute for concrete is needed, and the Ledite can be a good substitute for concrete. In this study, we compared the Ledite with the concrete. The comparing list are the needed shielding thickness, the period of construction and the cost.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.48 no.4
• /
• pp.495-503
• /
• 2012

An acoustic method for discriminating plankton from fish, in Lake Dom Helvecio of Brazil, is developed. The flow of data from this method is comprised of time varied threshold (TVT), dilation filter, bitmap and mask functions. The TVT can, of itself, precisely explain how to select an appropriate value. The final results of the echogram, which only shows plankton by masking fish signals, is used to examine the acoustic density of plankton by depth and time. The results indicate that the acoustic density of the plankton is at a depth of between 5m to 15m, its density is especially high at 10m to 15m. The results of the acoustic density of plankton by time indicate that May 7 is higher in density than May 8. Future study plans include the use of net samples, environmental datasets to identify the abundance and ecology described by the Chaoborus spp. from other species.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.50 no.10
• /
• pp.729-737
• /
• 2022

Melting and icing process of the PCMTCU(Phase Change Material Thermal Control Unit) installed on the NEXTSat-2, which is scheduled to be launched in the second half, was investigated through the results of satellite-level TVT(Thermal Vacuum Test). As a result of the test, it was confirmed that the latent heat of PCM contributes to the temperature stabilization of the heating components. The thermal model for numerical analysis of the PCMTCU was correlated to acquire a reasonable degree of accuracy using the collected temperature measurements during TVT. The periodic temperature variation of the PCMTCU in normal on-orbit operation was predicted with the correlated thermal model, and the quantitative contribution of the PCM on the thermal energy management was evaluated with the liquid fraction. It will receive flight telemetry from the NEXTSat-2 after the launch, and complete the space verification of the PCMTCU.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.53 no.4
• /
• pp.376-385
• /
• 2017

This study was conducted to understand the relationships between fish and zooplankton of distribution in the coastal waters of the East Sea from May to August 2016 using hydroacoustic. To distinguish between fish and zooplankton, we used the time varied threshold (TVT) method at the frequency of 120 kHz. As a result, the mean nautical area scattering coefficient (NASC) of fish was highest at $913m^2/n.mile^2$ in June and lowest at $315m^2/n.mile^2$ in July. The mean NASC of zooplankton was highest at $247m^2/n.mile^2$ in May and lowest at $70m^2/n.mile^2$ in July. The mean NASC of fish and zooplankton showed a significant difference (P < 0.05) with high correlation ($R^2=0.84$). In addition, there was no significant difference in the mean NASC of fishes and zooplankton by depth (t-test, person correction = -0.17, p > 0.05).

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.37 no.9
• /
• pp.916-922
• /
• 2009

Because thermal design of satellite carrying out mission in space is performed by thermal analysis result using thermal mathematical model, accuracy of thermal mathematical model is important and it can be improved by model correlation. Correlation steps of satellite thermal math model are composed of modeling of satellite configuration placed in thermal vacuum chamber, verification of correspondence between thermal math model and real satellite configuration, and adjustment of modeling parameters from major part to minor part etc. In this study, correlation success criteria was established and correlation for satellite thermal math model was performed using result of thermal vacuum test of satellite structure-thermal model to meet the success criteria. The overall results satisfied the criteria and this correlated thermal model was applied for detailed thermal design of satellite.