• 한국신재생에너지학회:학술대회논문집
• /
• 2008.05a
• /
• pp.386-389
• /
• 2008

This study has analysed power output characteristics of transparent thin-film PV module depending on incidence angle and azimuth. The simulation results was evaluated power outputs of transparent thin-film PV module depending on incidence angle and azimuth after calibrating the experimental and computed data. As a result, the best power output performance of transparent thin-film PV module was obtained at slope of $30^{\circ}$ to the south, producing the annual power output of 977kWh/kWp. The annual power output data demonstrated that the PV module with a slope of $30^{\circ}$ could produce a 68 % higher power output than that with a slope of $90^{\circ}$, with respect to the inclined slope of the module. Furthermore, the PV module facing south showed a 22 % higher power output than that facing to the east in terms of the angle of the azimuth.

• Korean Journal of Plant Taxonomy
• /
• v.39 no.4
• /
• pp.292-295
• /
• 2009

Here, we report a previously unrecorded species, Sin-an-sae-u-nan-cho (Calanthe aristulifera Rchb. f.). It was discovered on Heuksan Island in Jeollanam-do. Its natural habitat was a subtropical forest. The species can easily be characterized by the simple trichomes on the back of its leaves and spur. This species is important because new horticultural races of Calanthe can be developed by cross-breeding with other species of Calanthe.

• Korean Journal of Environmental Agriculture
• /
• v.19 no.3
• /
• pp.252-258
• /
• 2000

SWMM and WASP5 were applied for pollutant loading estimate from watershed and reservoir water quality simulation, respectively, to predict estuarine reservoir water quality. Application of natural systems to improve estuarine reservoir water quality was reviewed, and its effect was predicted by WASP5. Study area was the Hwa-Ong reservoir in Hwasung-Gun, Kyonggi-Do. Procedures for estimation of pollutant loading from watershed and simulation of corresponding reservoir water quality were reviewed. In this study, SWMM was proved to be an appropriate watershed model to the nonurban area, and it could evaluate land use effects and many hydrological characteristics of catchment. WASP5 is a well known lake water quality model and its application to the estuarine reservoir was proved to be suitable. These models are both dynamic and the output of SWMM can be linked to the WASP5 with little effort, therefore, use of these models for reservoir water quality prediction in connection was appropriate. Further efforts to develop more logical and practical measures to predict reservoir water quality are necessary for proper management of estuarine reservoirs.

• The Journal of Korean Medicine
• /
• v.20 no.1 s.37
• /
• pp.113-121
• /
• 1999

This Study was carried out to investigate the protective effect of GalHwaHaJungTang(GHT) on the gastric lesions indused by ethanol in rats. Rats were pretreated with GHT extract 1.7ml/kg, 3.4ml/kg, 5ml/kg and then were given orally 1ml of absolute ethanol 30min later. The animals were killed 1hr after ethanol treatment In morphorogic change, ethanol induced prominent longitudinal hemorrhagic lesions in the stomach. But GHT-pretreatment showed a dose-depentent decrease in the mucosa lesions. GHT extract siginificantly reduced lipid peroxidation and also induced an increase of superoxide dismutase(SOD), catalase and gluthathion(GSH) levels, but showed no influence in the type conversion of xanthine oxidase. These results suggest that the proposed gastroprotective effect may involve activation of antioxidant effects, but independent of the xanthine oxidase system.

• Archives of Pharmacal Research
• /
• v.20 no.6
• /
• pp.539-544
• /
• 1997

Anti-metastatic activities of IH901, an intestinal bacterial metabolic derivative formed from Ginseng protopanaxadiol saponins, was determined in vitro and in vivo. Under in vitro conditions, IH901 inhibited the migration of bovine aortic endothelial cells 25 times stronger than suramin and suppressed the invasion of HT1080 human fibrosarcoma cells into reconstituted basement membrane components of Matrigel 1000 times stronger than RGDS peptide. IH901 also showed inhibitory effect on type-IV collagenase secretion from HT 1080 cells and platelet aggregation. When the anti-metastatic activity of IH901 was evaluated in comparison with that of 5-FU using a spontaneous lung metastatic model of Lewis lung carcinoma, the administration of IH901 (10 mg/kg p. o.) to tumor-bearing mice led to a significant decrease in lung metastasis (43% of untreated control), which was slightly more effective than that obtained with 5-FU (56% of control). Thus, IH901 seems to exhibit its anti-metastatic activity partly through the inhibition of tumor invasion which results from the blockade of type IV collagenase secretion and also through anti-platelet and anti-angiogenic activities.

• International Journal of Control, Automation, and Systems
• /
• v.6 no.6
• /
• pp.948-953
• /
• 2008

In high dynamic situations, the GPS carrier tracking loop requires a wide bandwidth to track a carrier signal because the Doppler frequency changes more rapidly with time. However, a wide bandwidth allows noises within the bandwidth of the tracking loop to pass through the loop filter. As these noises are used in the numerical controlled oscillator(NCO), the carrier tracking loop of a GPS receiver shows a degraded performance in high dynamic situations. To solve this problem, an adaptive two-stage Kalman filter, which offers the NCO a less noisy phase error, can be used. This filter is based on a carrier phase dynamic model and can adapt to an incomplete dynamic model and a quickly changed Doppler frequency. The performance of the proposed tracking loop is verified by several simulations.

• Journal of the Korean Ceramic Society
• /
• v.49 no.5
• /
• pp.454-460
• /
• 2012

The nano-sized zirconia powders were synthesized in an impregnation method using pulp and $ZrOCl_2{\cdot}8H_2O$ as an initial material. The synthesized powders were characterized by XRD and FE-SEM. The particle size of the powder was controlled by preparation conditions, such as drying temperature and time. As a result of the various drying and calcination conditions, 30~50 nm sized homogeneous zirconia particles were obtained at $800^{\circ}C$ for 1 h. Crystallization and the rapid growth of particles were accelerated with increasing calcination temperature and time. Tetragonal phase generated below $800^{\circ}C$ were transferred to monoclinic phase with increasing calcination temperature and time. Moreover, above $800^{\circ}C$, heat treatment time had very large influence on the particle growth, and the change of drying condition also had large influence on the growth of a crystal.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.27 no.10
• /
• pp.1370-1376
• /
• 2003

The investigation of liquid fuel film on the cylinder liner is an essential to understand the engine-out hydrocarbon emissions formation in SI engines. In this research, two-dimensional visualization was carried out to investigate the liquid fuel film on the quartz liner in the optical engine. For this, the optical engine with hydraulic system was designed based on the commercial SI engine. The visualization was based on the laser-induced fluorescence with total reflection technique. Using a quartz liner and a special lens, only the liquid fuel film on the liner was visualized. With using this technique, the distribution of the fuel film on the cylinder liner was measured for different engine conditions and injection timing in the optical engine.

• Proceedings of the IEEK Conference
• /
• 2005.11a
• /
• pp.339-342
• /
• 2005

We present an efficient block-based motion estimation algorithm with motion analysis. The motion analysis determines a size of search pattern and a maximum repeated count of search pattern. In case of large movement in large image, we reduce search points and the local minimum which caused by low performance. The proposed algorithm employs with searching step of 2. The first step determines an initial search point with neighbor block vector and a size of initial search pattern. The second step determines a size of search pattern and a maximum repeated count with motion analysis. We improve motion prediction accuracy while reducing required computational complexity compared to other fast block-based motion estimation algorithms.

• The Journal of the Korean dental association
• /
• v.41 no.3 s.406
• /
• pp.190-196
• /
• 2003

Osteoblastoma is an uncommon lesion of bone that occurred in jaw bone. The etiology of the Osteoblastoma is still undiscovered. The most frequent symptom is consistent pain which is often severe, and localized swelling and bone expansion mat occur. We experienced a case of osteo-blastoma which occurred on the lingual surface of mandibular body. It resembled tours mandibularis clinically, alveolar abscess radiologically. Biopsy was done to evaluable the tours-like bony mass. The results of excisional biopsy demonstrated an osteoblastoma. The symptoms are subsided and no signs related with recurrence have been noted. Our experience and many literatures demonstrated that Osteoblastoma must be included in differential diagnosis of bone-producing lesion.