• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.829-831
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• 2001

현재의 정보통신 사회에서 널리 사용되는 인터넷 서비스는 기본적으로 ID/PW(PassWord) 기반의 인증을 사용한다. 이때 사용자는 여러 웹 서비스에 대해서 각각 다양한 ID/PW를 기억해야 한다는 어려움을 가진다. 마찬가지로 웹 서비스 관리자 역시 여러 사용자들의 ID/PW를 관리하는데 많은 비용 및 노력을 소모해야 한다. 따라서 한 번의 안전한 인증 과정을 통해 사용자 및 관리자의 편리를 도모할 수 있는 SSO(Single Sign-On) 시스템의 적용이 필수적으로 요구되고 있다. 본 연구에서는 기존의 SSO 시스템을 분석하여 새롭게 모든 인터넷 환경에서 보다 안전하게 사용자에게 서비스를 제공하며, 관리자에게는 편리성을 제공하는 브로커와 에이전트의 기능을 포함한 통합 SSO 시스템을 설계하며, 추후 연구과제로서 실제 브로커 및 에이전트 기반 통합 SSO 시스템 구현 및 적용에 대하여 연구 할 것이다.

• Korean Journal of Agricultural Science
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• v.39 no.4
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• pp.459-466
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• 2012

The objective of this study is to observe growth pattern of grand rapids(lettuce) according to different dexperimental conditions for minimizing its growth period such as composition of nutrient, irradiation time of light source and cultivation mode. The culture of water spray type using seeds of grand rapids was performed during growth period of total 50 days. Experimental conditions consist of five compositions of nutrient (PW 0.5 mS/cm, PW 1.0 mS/cm, PY 0.5 mS/cm, PY 1.0 mS/cm, PW 2.0 mS/cm) and three irradiation times of light source (12h(on) / 12h(off), 18h(on) / 06h(off), 24h(on) / 00h(off)). Illumination was adjusted to ratio of 7:1:1 of red, blue and white color, respectively. Indoor environmental condition for cultivating grand rapids is as follows: temperature (19-$22^{\circ}C$), relative humidity (60-70%) and carbon dioxide (1,000-1,200 ppm). The data were obtained from five iteration tests. The maximum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PY 1 mS/cm for 1st week of cultivation period, 24 hr(on) / 00 hr(off) and PY 1mS/cm for 2nd week of cultivation period, and 24 hr(on) / 00hr(off) and PW 1 mS/cm for 3rd week of cultivation period, respectively. On the contrary, the minimum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PW 0.5 mS/cm for 1st week of cultivation period, 12 hr(on) / 12 hr(off) and PW 0.5 mS/cm for 2nd week of cultivation period, and 12 hr(on) / 12 hr(off) and PY 0.5 mS/cm for 3rd week of cultivation period, respectively. Based on the results obtained from this study, it is concluded that the growth level of grand rapids varied with different irradiation time of light source and composition ratio of nutrient according to cultivation period.

• Journal of Environmental Science International
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• v.2 no.1
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• pp.43-49
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• 1993

Concentrations of sulfate and 6-values of sulfate, $({\delta}^{34}SO_4_){pw}$, dissolved In pore waters were measured from the sediment cores of the two different marine environments : deep northeast Pacific (57-1) and coastal Kyunggi Bay of Yellow Sea (57-2) . Sulfate concentration in pore waters decreases with depth at both cores, reflecting sulfate reduction in the sediment columns. However, much higher gradient of pore water sulfate at 57-2 than 57-1 indicates more rapid sulfate reduction at 57-2, because of high sedimentation rate at the coastal area compared to the deep-sea. The measured 6-values, $({\delta}^{34}SO_4_){pw}$, follow extremely well the predicted trend of the Rayleigh fractionation equation. The range of 26.756 to 61.35% at the coastal core 57-2 is not so great as that of 32.4$\textperthousand$ to 97.8$\textperthousand$ at the deep-sea core 57-1. Despite greater graclient of pore water sulfate at 57-2, the 6-values become lower than those of the deep- sea core 57-1. This inverse relation between the 6-values and the gradients of pore water sulfate could be explained by the combination of the two subsequent factors : the kinetic effect by which the residual pore water sulfate becomes progressively enriched with respect to the heavy isotope of $^{34}S$ as sulfate reduction proceeds, and the intrinsic formulation effect of the Rayleigh fractionation equation in which the greater becomes the fractionation factor, the more diminished values of $({\delta}^{34}SO_4_){pw}$ are predicted.

• Journal of Soil and Groundwater Environment
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• v.19 no.3
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• pp.33-38
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• 2014

This study was performed to evaluate the applicability of pump and treat technology as well as to identify the changes of groundwater level by continuous pumping at the petroleum contaminated site. A total of 9 monitoring wells were installed at the site and the contaminant concentrations, TPH, benzene, toluene, ethylbenzene and xylene, of groundwater were measured. With the results of the groundwater monitoring, a total of 9 wells were set up for pumping contaminated groundwater in 3 locations. The waste water treatment facility with a capacity of $10m^3/hr$ was installed in the site and operated for about 1 year. The concentrations of the contaminated groundwater from the 3 pumping wells were exceeded groundwater regulation for benzene and TPH. However, the effluent concentration of benzene and TPH was under the regulation showing the maximum level of 0.011 mg/L and 1.2 mg/L during the operation periods. Groundwater levels were decreased by continuous pumping and those were not recovered during the operation period. Groundwater levels of PW-1,2, PW-3,4,5,6 and PW-7,8,9 were decreased about 5 m, 0.7 m, 2 m, respectively. The hydraulic conductivity (K) of the region of PW-1,2, PW-3,4,5,6 and PW-7,8,9 was estimated to be $6.143{\times}10^{-5}cm/sec$, $2.675{\times}10^{-5}cm/sec$, $1.198{\times}10^{-4}cm/sec$. Groundwater level was seemed to be affected not by hydraulic conductivity but by morphological effect. These results show that the pump and treat technology has high applicability for the restoration of petroleum contaminated groundwater but needs continuous monitoring to prevent rapid groundwater drawdown.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2001.04a
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• pp.187-190
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• 2001

This study is concerned with the hydrodispersive characteristics of granite in Changwon area. A single-well injection/recovery tracer test was conducted to determine longitudinal dispersivity of the granite, using sodium chloride tracer The dispersivity values obtained from the injection phase are 0.48 m (for between PW-1 and OW-3) and 0.72 m (for between PW-1 and OW-4). That obtained from the recovery phase is 0.68 m. The result of the tracer test indicates that the anisotropy and heterogeneity of the granite and the direction of flow.

• Convergence Security Journal
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• v.11 no.6
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• pp.31-36
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• 2011

Cloud computing is a system which efficiently utilizes resources. In this paper, we propose 2-factor authentication system combing PKI, ID_PW and location information. The proposed method improve the security of hybrid cloud systems and manage resources more safely.

• Bulletin of the Korean Chemical Society
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• v.30 no.7
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• pp.1665-1666
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.6-7
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• 2003

The inertial fusion research at ILE, Osaka moves to the fast ignition scheme with using PW laser system to achieve hot core plasma of keV-temperature by heating additionally the dense plasma imploded by the multi-beam Gekko laser system. The solid-state lasers have been developed of the peak-power from TW to PW region with the chirped pulse amplification (CPA) and optical parametric amplification (OPA) technology. (omitted)

• The Bulletin of The Korean Astronomical Society
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• v.46 no.1
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• pp.61.3-61.3
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• 2021

We, on behalf of the Korean Gemini Office (KGO), introduce three proposal routes besides a standard semester program available for the Korean Gemini users: Fast Turnaround (FT), Director's Discretionary Time (DDT), and Poor Weather (PW). By presenting useful statistics and some examples implemented through these routes, we aim to provide the KAS members insights how well these observing routes have been utilized by the Gemini partners. Finally, we provide several useful suggestions to the KAS community for preparing these programs.

• Journal of the East Asian Society of Dietary Life
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• v.23 no.4
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• pp.437-443
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• 2013

Rice wine (makgeolli) containing various amounts of mountain ginsengs (MG) are being prepared with nuruk and yeasts, and the physicochemical characteristics and contents of ginsenosides in MG-makgeolli were analyzed. Average particle size of MG powder is $29.1{\mu}m$. MG slice (20 g) or powder (0~20 g) and rice (3,000 g) were used for 12 days fermentation of makgeolli, makgeolli containing slice of MG (SW-makgeolli), makgeolli containing 2 g (PW1-makgeolli), 10 g (PW2- makgeolli), 20 g (PW3-makgeolli) of powder of MG, respectively. Soluble solids and pH levels show no differences between five kinds of makgeolli groups, whilst the presence of high amounts of MG (PW3-makgeolli) caused decreases in ethanol and acidity. Major free amino acids in MG-makgeolli are glutamic acid and arginine. Total contents of 14 ginsenosides are approximately 2.5 g/100 g of dried MG powder and major ginsenoside were ginsenosides Re, Rb1, Rb2, Rg1, Rc and Rf. During the propagation of makgeolli containing MG, the ginsenosides Rb1, Rb2, Rb3, and Rc decreased, whilst ginsenosides Rg3 and compound K increased highly. It indicates that ginsenosides in MG are metabolized to different forms of ginsenosides by brewing microorganisms.