• Journal of Institute of Control, Robotics and Systems
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• v.21 no.6
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• pp.589-594
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• 2015

In this paper, we described the Cramer-Rao Lower Bound (CLRB) performances of Time Difference of Arrival (TDOA) and Frequency Difference of Arrival (FDOA) methods when there are multiple emitters. The TDOA and FDOA values between two receivers can be simultaneously estimated by using the so-called Complex Ambiguity Function (CAF). In the case of multiple emitters, there exist Inter Symbol Interferences (ISIs) in the measurement data. Therefore, it is required to reduce the effect of ISI and provide a performance evaluation method of TDOA and FDOA estimations. In order to eliminate the ISIs, using of a filter bank before calculating CAF is proposed when the carrier frequencies of the emitters are different to one another. Angle of Arrival (AOA) or Received Signal Strength (RSS) methods before calculating CAF were proposed to reduce the ISIs when the carrier frequencies are the same. In order to evaluate the CRLB of TDOA and FDOA estimations, we employed the conditional probability distribution method and described the numerical comparison results.

• Advances in Traditional Medicine
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• v.8 no.4
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• pp.416-422
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• 2008

This study evaluated the anti-inflammatory potential of the crude alkaloidal fraction (CAF) of methanol extract of Solanum trilobatum Linn. (Solanacea) root in animal models of inflammation. Crude alkaloidal fraction at doses of 25, 50 and 100 mg/kg significantly (p < 0.01) reduced carrageenan induced rat paw volume at 3 h after carrageenan challenge as compared to control group of animals. CAF (25, 50 and 100 mg/kg) significantly (p < 0.01) and dose dependently suppressed cotton pellet induced granuloma formation. Topical application of CAF (1, 5 and 10 mg/ear) markedly inhibited multiple application of TPA in mice. CAF elicited pronounced inhibitory effects on formaldehyde and adjuvant induced arthritis in rats. These results indicate that CAF of methanol extract of the Solanum trilobatum has anti-inflammatory activity in acute and chronic inflammation.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.1
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• pp.9-15
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• 2023

The cement is a typical CO₂ emission industry. Manufacturing process improvements and increased use of alternative materials are needed to reduce energy consumption and CO₂ emissions. This study confirmed the basic characteristics of cement hydration by sintering CAF at low temperature as a CO₂ adsorbent material. For the hydration product of the synthetic CAF, crystal phase analysis, porosity, and structural images were confirmed, and the compressive strength was measured. The replacement rate of SCAF was 10, 20, and 100 %, and the compressive strength tended to decrease as the replacement rate increased. In addition, when the SCAF substitution rate is 100 %, the hydration products of the early age are calcium aluminum oxide hydrate (Ca₃Al₂O₆ x H₂O) and calcium iron hydroxide (Ca₃Fe(OH)₁₂), and at substitution rates of 10 and 20 %, CAF compounds other than general cement hydrates brownmillerite was observed. As for the porosity, the pore size increased and the porosity increased with the increase of the replacement ratio. As a result of this study, CAF manufactured by low-temperature sintering seems to be difficult to use alone and general curing for utilization as a CO₂ adsorbing material.

• Journal of the Korean Geographical Society
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• v.49 no.4
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• pp.546-562
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• 2014

This research attempts to investigate the geographical approaches on healing, which have been neglected in geography relatively, comprehensively and to examine the meaning of healing in daily life from the viewpoint of the managers of psychological counselling caf$\acute{e}$s. According to the results of this research, exposed healing spaces such as mental clinics or counselling centers are regarded as cultural stigmatic spaces; besides, psychological counselling caf$\acute{e}$s decrease psychological distance or resistance and people calling for healing can access these healing spaces easily. Second, healing spaces from a perspective of modern people mean geographical boundaries as refuges for a brief time; accordingly, the users' activities in psychological counselling caf$\acute{e}$s as instant or unexpected healing spaces in daily life are interpreted as special experiences without any emotional burdens. And these psychological counselling caf$\acute{e}$s are regarded as the spaces where can experience healing repeatedly and continuously. Third, psychological counselling caf$\acute{e}$s were changed into general caf$\acute{e}$s as open spaces; therefore, they can penetrate deeper into daily life rather than others.

• Korean Institute of Interior Design Journal
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• v.14 no.1
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• pp.151-159
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• 2005

The atmosphere of a caf is one of the most important elements for cafe interior design since it is linked directly with profit. As human sensibility ergonomics which is recently signified In various fields is an attempt to quantitatively analyze factors of human sensibility and apply it to design operation, it can be apt for analyzing caf atmosphere. Employing human sensibility ergonomics this study examined issues to be considered for preferred caf interior design. The outcome of this study indicated that the most significant caf design factors are "'style', 'artificiality' and 'enjoyment'. It also suggested a design guideline by evaluating features of each factor. Constructing a successful interior design can be achieved by applying this design guideline.

• Proceedings of the KOSOMBE Conference
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• v.1995 no.11
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• pp.101-104
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• 1995

In this paper, we designed a cascade adaptive filter for elimination of the baseline drift and the distortion of the filtered signal. The cascade adaptive filter(CAF) consists of two filters. The first adaptive filter which has the cutoff frequency of 0.3Hz eliminate the noisy signal. The second adaptive filter remove the remnant baseline drift which is not eliminated by the first adaptive filter. Comparing the performance of the CAF with standard filter, recursive notch filter(RNF) and a adaptive impulse correlated filter(AICF), the CAF showed a higher performance in removal of the baseline drift than standard filler, and RNF. Also, considering the distortion of filtered signal, CAF is better than AICF and is comparable to the standard filter.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.7
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• pp.60-68
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• 2014

In modern electronic warfare systems, a demand on the more accurate estimation method based on TDOA and FDOA has been increased. TDOA/FDOA localization consists of two-stage procedures; the extraction of information from signals, and the estimation of emitter location. CAF(complex ambiguity function) is known as a basic method in the extraction stage. However, when we extract TDOA and FDOA information from VHF(very high frequency) communication signals, conventional CAF algorithms may not work within a permitted time because of much computation. Therefore, in this paper, an improved sequential estimation algorithm based on CAF is proposed for effective calculation of extracting TDOA and FDOA estimates in terms of computational complexity. The proposed method is compared with the conventional CAF-based algorithms through simulation. In addition, we derive the optimal performance based on the CRLB(Cramer-Lao lower bound) to check the extraction performance of the proposed method.

• Korean Institute of Interior Design Journal
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• v.22 no.5
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• pp.68-77
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• 2013

'The Third space,' which is the concept that embraces sociological, spatial, and marketing concepts, refers to the place which is other than the home and the workplace and which is a comfortable frequented place where meditation, psychological relaxation, and social needs can be satisfied. 'The Third space' has the characteristics of comfort, openness, interactivity, playfulness, and diversity. In modern times, most of consumption spaces play the role of 'the Third space,' and the typical example is $Caf{\acute{e}}$. $Caf{\acute{e}}$ began from its origin with the characteristics of 'the Third space,' and recently it has become the complex cultural space of urban dwellers. $Caf{\acute{e}}$ as 'the Third space' has the characteristics of a healing space, communication space, personalized space, value-expressive space, culture and consumption space, nomad space. Such characteristics of $Caf{\acute{e}}$ are well represented in the cafes around the regions where 'street culture' has recently been formed. As examined through the examples, $Caf{\acute{e}}$ as 'the Third space' can be more strategically produced by establishing themes through storytelling, giving spatial identity through style creation, diversifying the sequence through complex space organization, and establishing interaction devices through experience elements.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.5
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• pp.35-40
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• 2010

The present study proposes the strengthening method to use Conclinic Advanced FiberWrep(CAF) so as to improve Load Carrying Capacity of the RC slab bridge. In order to evaluate the strengthening performance, we strengthen 50cm per unit-width of CAF to the slab's bottom of the test bridge that designed with DB 18, then perform Static and Dynamic Field Load Test. As a result of this, 14.7% of the maximum displacement, 5.0% of the strain and 33.7% of the impact factor are reduced after strengthening. At the middle of the test spans, nominal resisting ratio is increased by 27% and Service Load Carrying Capacity is increased by 44.6%, 48.9% of each span 1 and 2. In conclusion, this study indicates that the strengthening method using CAF is very effective to improve the deteriorated RC slab bridge designed with DB 18, to the DB 24 of the first class bridge design load.

• Journal of the Korean Society of Food Culture
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• v.31 no.1
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• pp.64-72
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• 2016

This study investigated the correlation between consumer's buying habits and food styling visual elements. Differentiated and original techniques were used to determine whether or not visual elements in tteok menus reflect the aesthetic needs of consumers without altering the nutrition of tteok. The targeted tteok cafes were in Jeonju Hanok Village, which is a tourist attraction in Korea. First, sub-factors of food styling visual elements applied to tteok $caf{\acute{e}}$ menus such as shape, size/volume, color, and texture all had significantly positive effects on customer satisfaction, proving that food styling visual effects applied to tteok $caf{\acute{e}}$ menus have significant effects on customer satisfaction. Second, sub-factors of food styling visual elements applied to tteok $caf{\acute{e}}$ menus all had significantly positive effects on buying habits. Third, customer satisfaction of menus had a significant effect on buying habits, as proven by previous studies. Fourth, the effects of customer satisfaction on the relationship between food styling visual factors applied to tteok $caf{\acute{e}}$ menus and buying habits were investigated.