• Transactions of the Korean Society of Mechanical Engineers
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• 제19권7호
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• pp.1758-1769
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• 1995

The heat transfer of oscillating flow in a cylinder with regenerator was investigated by the moving boundary technique. The flow in regenerator was modeled by means of Brinkman Forchheimer-Extended-Darcy equation . Results showed that when piston moved toward right, velocity vectors near cylinder wall at left piston and right side of regenerator inclined to symmetric axis and velocity vectors near cylinder wall at right piston and left side of regenerator inclined to cylinder wall. And the time averaged Nusselt number was increased by 46.73% when the oscillatory frequency became twice and decreased by 31.46% when the oscillatory frequency became half. The time averaged Nusselt number was increased by 18.09% when thickness of the regenerator became twice and decreased by 7.53% when thickness of the regenerator became half. But mesh size of regenerator hardly affected the Nusselt number. And efficiency of regenerator was larger as the oscillatory frequency was smaller, thickness and mesh size of regenerator was larger.

• Journal of Veterinary Clinics
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• 제19권2호
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• pp.256-259
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• 2002

A 39 kg, 7-year-old male Labrador Retriever dog with a 3-month history of epistaxis, sneezing, and nasal discharge was referred to the Veterinary Medical Center of the Tokyo University. On the plain X-ray and computed tomography (CT) of the head showed increased density of the soft tissue in the left nasal cavity and the tumor infiltrated to nasal septum. The tumor mass removed by rhinotomy. Histopathological examination of the mass revealed adenocarcinoma. Four weeks after the surgery, the radiation therapy was performed twice a week for f weeks. 4 months after surgery, the dog had a recurrence in nasal cavity and administered carboplatin 300 mg/$m^2$ twice. However, the tumor had no response to chemotherapy, additional surgery and additional radiation therapy, and the dog was euthanized at the owner's request. At necropsy, metastatic proliferation was confirmed in the lung, lymph nodes and nasal cavity.

• Korean Journal of Veterinary Research
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• 제33권3호
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• pp.525-530
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• 1993

Studies were conducted in 13 Korean native heifers to determine the puberty based on plasma progesterone profiles and estrus observations. Blood samples for determination of progesterone profiles were collected from jugular vein twice a week from 8 to 24 months of age, and all heifers werce observed for estrous behaviours twice a day. Heifers attained puberty at 11.3 months of age and 188.5kg body weight as determined by progesterone profiles, whereas the first estrous behaviours were observed at 14.2 months of age and 215.4kg body weight. This result indicates that determination of plasma progesterone profiles could be utilized for monitoring the puberty in Korean native heifers, and one or more ovulations occurred before pubertal heifers showed overt estrous behaviours.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• 제15권9호
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• pp.1053-1059
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• 2005

Dynamic stability of an axially accelerating beam structure is investigated in this paper. The equations of motion of a fixed-free beam are derived using the hybrid deformation variable method and the assumed mode method. Unstable regions due to periodical acceleration are obtained by using the Floquet's theory. Stability diagrams are presented to illustrate the influence of the dimensionless acceleration, amplitude, and frequency. Also, buckling occurs when the acceleration exceeds a certain value. It is found that relatively large unstable regions exist around the first bending natural frequency, twice the first bending natural frequency, and twice the second bending natural frequency. The validity of the stability diagram is confirmed by direct numerical integration of the equations of motion.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 한국지진공학회 1997년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 1997
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• pp.90-97
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• 1997

The purpose of this study is to evaluate the seismic response characteristics of Wolsong nuclear power plant (NPP) structures for the Kyeongju earthquake(ML=4.3) occurred on June 26, 1997. The seismograms are obtained from five accelerographs of nuclear power plant at Wolsong, Kyeongbuk. The distance from the epicenter is about 25km. The peak acceleration (PA) due to the earthquake is 0.0235g, which is far lower value than that of design basis earthquake(DBE). The PA at the containment wall is about twice as large as that at free field. Also, the higher the accelerograph is located in, the larger the PA is measured to be From the response spectrum analysis, the dominant frequency of the response is close to 4 Hz, which is similar to the free field is poor because of contamination by high frequency waves as a result of reflection and diffraction between ground and NPP structure. We are of opinion that the accelerograph at the free field should be moved approximately twice the building dimension away from the containment structure.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2000년도 ITC-CSCC -2
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• pp.902-905
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• 2000

Because of the rapid growth of Internet and multimedia applications, how to protect IPR (intellectual property rights) has become a critical issue. Is one of the ways to overcome the problem of the protection of IPR. Digital watermarking call be applied to multimedia data, such as digital images, digital video, and digital audio. In this paper, we propose a digital watermarking technique for digital images to authenticate an owner or an image by embedding visually recognizable patterns, such as logos, signatures, or stamps into images In BDCT (block discrete cosine transform) frequency domain. The proposed method sorts the components of an original image twice. At the same time, the method, also, rearranges the components of a watermark twice in order to be more robust, and finally embeds the watermark into the image. From the experimental results, the conjunction of three similarity measurements shows that our proposed method is robust to image cropping, image filtering, and JPEG (the Joint Photographic Experts Group) both subjectively and objectively.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.85-86
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• 2007

In this paper, a Radix-8 structure for high-speed FFT is proposed. Even throughput of the Radix-8 FFT is twice than that of the Radix-4 FFT, implementation area of the Radix-8 is larger than that of Radix-4 FFT. But, implementation area of the proposed Radix-8 FFT was reduced by using DA(Distributed Arithmetic) for multiplication. The Verilog-HDL coding results for the proposed FFT structure show 49.2% cell area increment comparison with those of the conventional Radix-4 FFT structure. Namely, to speed up twice, 49.2% of area cost is required. In case of same throughput, power consumption of the proposed structure is reduced by 25.4%.

• The Journal of Internal Korean Medicine
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• 제37권2호
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• pp.251-256
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• 2016

Objective: This case report examines the effects of Jaeumganghwa-tang as a treatment option for Sjögren’s syndrome.Methods: We provided the patient with Jaeumganghwa-tang twice a day, as well as acupuncture and bee venom therapy (both twice a week), for 30 days. Symptoms were charted and evaluated using the European League Against Rheumatism (EULAR) Sjögren’s Syndrome Patient Reported Index (ESSPRI).Results: The patient’s ESSPRI score decreased from 8 to 6 after the 30-day treatment.Conclusions: Jaeumganghwa-tang may be helpful in alleviating Sjögren’s syndrome.

• Nuclear Engineering and Technology
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• 제34권2호
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• pp.105-116
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• 2002

In special industrial fields such 3s nuclear power plants and chemical plants, it is often necessary to repair system components without plant shutdown or drainage of system having many piping structures which may have hazardous or expensive fluid. A temporary ice plugging method for blocking internal flow is considered as a useful method in that case. According to the pipe freezing guideline of the nuclear power plant, the length of a freezing jacket must be longer than twice of the pipe diameter. However, for applying the ice plugging to short pipes which do not have enough freezing length because of geometrical configuration, it is inevitable to use shorter jacket less than twice of the pipe diameter. In this study, the integrity evaluation for short pipes in the nuclear power plant Is conducted by an experiment and the finite element analysis. From the results, the ice plugging process in short pipes can be safely carried out without any plastic deformation and fracture.

• Journal of Chest Surgery
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• 제52권1호
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• pp.44-46
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• 2019

Gorham-Stout disease (GSD) was first described by Gorham and colleagues in 1954, but its precise mechanism and cause remain to be elucidated. In this condition, voluminous and potentially fatal chylous effusions into the thorax can occur. Herein, we describe a case of GSD in which the patient presented with massive pleural effusions and mottled osteolytic bone lesions. We performed multiple operations, including thoracic duct ligation using video-assisted thoracoscopic surgery and thoracotomic decortication, but these procedures did not succeed in preventing recurrent pleural effusion and chest wall lymphedema. After administering sirolimus ($0.8mg/m^2$, twice a day) and propranolol (40 mg, twice a day), the process of GSD in this patient has been controlled for more than 2 years.