• New & Renewable Energy
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• v.19 no.4
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• pp.98-107
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• 2023

A study was conducted to analyze data from 1981 to 2020 for understanding the impact of climate on solar energy generation. A significant increase of 104.6 kWhm^-2 was observed in the annual cumulative solar radiation over this period. Notably, the distribution of solar radiation shifted, with the solar radiation in Busan rising from the seventh place in 1981 to the second place in 2020 in South Korea. This study also examined the correlation between long-term temperature trends and solar radiation. Areas with the highest solar radiation in 2020, such as Busan, Gwangju, Daegu, and Jinju, exhibited strong positive correlations, suggesting that increased solar radiation contributed to higher temperatures. Conversely, regions like Seosan and Mokpo showed lower temperature increases due to factors such as reduced cloud cover. To evaluate the impact on solar energy production, simulations were conducted using climate data from both years. The results revealed that relying solely on historical data for solar energy predictions could lead to overestimations in some areas, including Seosan or Jinju, and underestimations in others such as Busan. Hence, considering long-term climate variability is vital for accurate solar energy forecasting and ensuring the economic feasibility of solar projects.

• Journal of the Korea Organic Resources Recycling Association
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• v.11 no.1
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• pp.129-129
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• 2003

본 연구는 음식물 퇴비의 합리적인 시용량을 검증하고, 3년 연용에 의한 토양 변화 및 고추 생육과 수량에 미치는 영향을 평가하고 돈분퇴비를 시용한 대조구와 생육 및 품질 면에서 비교 분석하여 적정한 퇴비 시용량을 설정하기 위하여 실시하였다. 처리구는 1, 2, 3차 연도 모두 동일한 방법으로 무처리구, 대조구(2ton/10a의 돈분퇴비), 음식물 퇴비 2t, 4t, 6t, 8ton/10a을 사용한 처리구 등 6개를 두었으며 3반복, 난괴법을 이용하였다. 음식물 퇴비와 돈분 퇴비의 이화학적 특성을 분석한 결과, 음식물 퇴비의 경우 1차 연도는 유기물과 NaCl 모두 부산물 비료의 공정규격에 적합하였으나, 2차 연도는 유기물이, 3차 연도는 NaCl이 공정규격에 적합하지 않았다. 그리고 돈분 퇴비의 경우 수분함량이 약간의 차이를 보였으나 공정규격을 벗어나지는 않았다. 토양은 음식물 퇴비 시용량이 증가할수록 대부분의 화학적 특성이 증가하였고, 연용에 의해서도 유기물, 치환성양이온, NaCl 등의 양이 증가함을 보여 염류집적이 일어나고 있음을 확인할 수 있었다. 또, 음식물 퇴비 시용량증가에 따라 비중은 낮아지고 공극률이 증가하여 물리성 개선에 도움을 주었으나, 1, 2, 3차 연도를 비교해 보았을 때 큰 차이는 없었다. 고추의 생육과 수량에 있어서도 음식물 퇴비 시용량이 증가할수록 초기 생육이 저조하였으며, 그로 인해 수량이 감소하였다. 또한 3년 연용으로 인한 음식물 퇴비의 축적으로 수량의 감소와 품질 저하를 초래하였다. 음식물 퇴비의 연용에서 2ton/10a 이상의 시용은 수량의 감소를 초래하였다. 이러한 결과로 볼 때 음식물 퇴비를 2ton/10a 이하로 사용하면 큰 무리는 없겠지만 장기 연용은 삼가는 것이 좋을 것이라 판단된다. 따라서 음식물 퇴비를 다른 일반 퇴비 제조의 중간 원료나, 또는 혼합 사용하는 시험을 계속 진행 중에 있다.

• Korean Journal of Environmental Biology
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• v.24 no.4
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• pp.387-391
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• 2006

Computational and experimental dosimetry of Henschke applicator with respect to high dose rate brachytherapy using the MIRD phantom and a remote control afterloader were performed. A comparison of computational dosimetry was made between the simulated Monte Carlo dosimetry and GAMMADOT brachytherapy Planning system's dosimetry. Dose measurements was performed using ion chamber in a water phantom. Dose rates are calculated using Monte Carlo code MCNP4B and the GAMMADOT. Thecomputational models include the detailed geometry of Ir-192 source, tandem tube, and shielded ovoids for accurate estimation. And transit dose delivered during source extension to and retraction from a given dwell position was estimated by Monte Carlo simulations. Point doses at ICRU bladder/rectal pointswhich have been recommened by ICRU 38 was assessed. Calculated and measured dose distribution data agreed within 4% each other. The shielding effect of ovoids leads to 19% and 20% dose reduction at bladder surface and rectal points.

• Journal of Physiology & Pathology in Korean Medicine
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• v.27 no.5
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• pp.497-508
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• 2013

In addition to our previous study on the diseases and symptoms described in Juan Wooden Slips(居延漢簡), here we focused on therapeutics of Juan Wooden Slips, including herbal medicines, acupuncture, and moxibution. In Juan Wooden Slips, there are 36 species of medicinal herbs and 17 herbal prescriptions. Among the medicinal herbs, 75% of herbs were also used in Shanghanzabing-lun(傷寒雜病論). In terms of efficacy and therapeutic range of the medicinal herbs and prescriptions, Juan Wooden Slips is very similar to Shanghanzabing-lun. In addition, acupuncture were used as a combined with moxibution or herbal remedies similarly to Shanghanzabing-lun. Thus, we suggest that the medical thoughts and technologies shown in Juan Wooden Slips might influence on the establishment of Shanghanzabing-lun.

• Atmosphere
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• v.17 no.1
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• pp.101-108
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• 2007

To observe and analyze the cloud and fog characteristics, the METeorological Research Institute (METRI) has established the Cloud Physics Observation System (CPOS) by implementing the cloud observation instruments: Forward Scattering Spectrometer Probe (FSSP), PARticle SIze and VELocity (PARSIVEL), Microwave Radiometer (MWR), Micro Rain Radar (MRR), and 3D-AWS at the Daegwallyeong Enhanced Mountain Weather Observation Center. The cloud-related products of CPOS and the validation status for the size distribution of FSSP, the precipitable water of MWR, and the rainfall rate of MRR and PARSIVEL are described.

• Korean Journal of Pharmacognosy
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• v.22 no.4
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• pp.249-251
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• 1991

The cytotoxic and antibacterial activities of the leaf, the stem and the seed extracts of Luffa cylindrica were evaluated against L1210 cells and Streptococcus mutans OMZ176, respectively. Among hexane, ether, butanol and water fractions, the ether fraction demonstrated the most potent cytotoxic activity, and the $ED_{50}$ values of the ether extract from the leaf, the stem and the seed were 3.5, 3.7 and $13.7{\mu}g/ml$, respectively. Meanwhile, the other fractions showed negligible effect. Separately, it was found that the antibacterial activity of the respective fraction from three parts was insignificant.

• The Journal of Information Systems
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• v.16 no.4
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• pp.51-73
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• 2007

Ubiquitous computing is enhancing computer use by making many computers available throughout the physical environment, but making them effectively invisible to the user. To facilitate the successful adoption and diffusion of ubiquitous computing, it is necessary to figure out the factors affecting the use of U-service. Though the research related to ubiquitous computing has been vigorously conducted from the aspect of system and service provider, there have been very few studies that focus on the user's perspective. Therefore, this study attempts to figure out major factors which are dedicated to the development of ubiquitous computing and u-service, and that ultimately influence the u-business outcome. This study derived the factors that characterize u-service, such as ubiquity, contextual offer, reliability, invisibility, and confidentiality, which are then combined in the TAM model and carry out the path analysis. The research findings indicate that ubiquity affects both the perceived usefulness and perceived ease of use. The reliability and confidentiality were found to affect the perceived usefulness, whereas the contextual offer and invisibility turned out to influence the perceived ease of use. Finally, the relationship among the perceived usefulness, perceived ease of use, and the attitude toward using are identical with the previous research findings related to the technology acceptance model(TAM).

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.964-966
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• 2002

This paper presents a magnet circuit design procedure to reduce mover mass of the moving coil type linear direct motor (LDM). The procedure of optimization is based on the response surface methodology (RSM) and Sequential Quadratic Problem (SQP). This procedure of optimization is verified by the comparison of the result of the initial design between the result of the optimum design.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.592-594
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• 2002

Hybrid stepping motor(HSM) has very small airgap and teeth. These bring out the saturation in the teeth easily. In this paper. the 3 dimension equivalent magnetic circuit network method (EMCNM) based on the trapezoidal element is used for the accurate and efficient nonlinear analysis of HSM. and the validity of the analysis results by the proposed method is verified by comparison with the experimental results.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.952-954
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• 2002

The effort for measuring the rotor vibration caused by the short of rotor winding or air-gap eccentricity has been carried on. This paper introduces on-line vibration monitoring technologies using search coils to measure flux for synchronous generators. A 3,300/6,600 (V), 150 [kW] synchronous generator is built, and search coils are designed and inserted in the wedges. Furthermore, air-gap eccentricity is analyzed by finite element method and compared with experiment tests. Induced voltages caused by different air-gap eccentricity on the search coils are compared as well.