• Journal of the Korean Chemical Society
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• v.35 no.6
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• pp.720-724
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• 1991

Simultaneous determination of chloragenic acid (CA), 3,4-o-dicafeoyl quinic acid(3,4-DCQA), 4,5-o-dicaffeoyl quinic acid (4,5-DCQA) and linarin in Chrysanthemum sibiricum Fisher was newly established by a reversed-phase high performance liquid chromatography (HPLC). Sample was extracted with 20 ml methanol for 4 hrs. The extract was cleaned up by using Sep-Pak $C_18$ cartridge and 4 ml methanol-$H_2$O(1 : 1) as eluent. Their determination was performed by means of RP-HPLC with Bondapak $C_18$ column (30 cm ${\times}$ 3.9 mm i.d., 10 ${\mu}m$ and gradient elution mode as methanol-5 mM $H_3PO_4$ solution (30 : 70). The established method was applied to various samples purchased. As a result, their content ranges showed to be 0.35~0.55% for CA, 0.46~0.76% for 3,5-DCQA, 0.077~0.23% for 4,5-DCQA and 0.16~2.72% for linarin, respectively.

• Solar Energy
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• v.18 no.1
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• pp.57-67
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• 1998

A study on a buoyancy effect by the temperature difference between a inner room air and a inflowing cool air and also by Inlet velocity can contribute greatly to enhance performance of air conditioning system, so the study on the distribution characteristics of inflowed cool air is important to analyze the cool air storage in a room. For this study, in the real-sized model room, the temperature differences between inflowing cool air and inner room air are 10, 20, $30^{\circ}C$, and the inlet velocities of inflowing cool air are 1, 2, 3m/s respectively as dynamic parameters. Also, a anemos and a vane type diffuser are used as inlet geometric conditions. Following conclusions have been obtained through this study. 1) In case of the anemos type diffuser, it is found that a dimensionless temperature profile is low and the distribution of the inflowed cool air is uniform. and also, all diffuusers have a low temperature of the inner room as increasing the inlet velocity. 2) A mixing takes place rapidly in case of the anemos type diffuser when the temperature difference is low ${\Delta}T=10^{\circ}C$ and the inletvelocity is high V=3m/s. and the mixing degree is higher with the anemos type diffuser than the vane.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.7 no.1
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• pp.42-47
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• 1998

This study was performed to compare the bonding mechanism of glass ionomers. In this study, hybrid glass ionomers were used for restoration(Fuji II LC, GC, Japan) as the material of choice. Two different etching solutions were used in this study, 35% phosphoric acid and 10% polyacrylic acid. The effect of two different conditioners to dentin surface of a primary molar was studied and compared by using scanning electron microscope. Further, the interface of the dentin surface and the hybrid glass ionomers were examined.

• Journal of the Korean Data and Information Science Society
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• v.13 no.1
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• pp.47-53
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• 2002

A new redescending M-estimating function is introduced. The estimators by this new redescending function attain the same level of robustness as the existing redescending M-estimators, but have less asymptotic variances than others except few cases. We have focused on estimating a location parameter, but the method can be extended for a scale estimation.

• Communications of the Korean Mathematical Society
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• v.13 no.3
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• pp.561-577
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• 1998

We study (n＋3)-dimensional contact three CR submanifolds of a Riemannian manifold with Sasakian three structure and investigate some characterizations of $S^{4r＋3}$(a) $\times$ $S^{4s＋3}$(b) ($a^2$＋ $b^2$=1, 4(r ＋ s) = n - 3) as a contact three CR sub manifold of a (4m＋3)-dimensional unit sphere.

• The Bulletin of The Korean Astronomical Society
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• v.26 no.1
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• pp.31.2-31.2
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• 2001

• The Journal of Internal Korean Medicine
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• v.21 no.2
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• pp.212-212
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• 2000

Objective : To observe the effect of Boryungbosim-tang on the cough, cough patients medicine Boryungbosim-tang. Methods : A clinical observation was done on 30 case of cough patients, treated by Boryungbosim-tang, who were hospitalized frome January, 1. 1999 to December, 31, 1999 at the department of IKSAN Oriental Medicine Hospital, Wonkwang University and Pak Cheon Soo oriental medical clinic. Results : The effect of treated by Boryungbosim-tang is that excellent was 19 case(63.33%), good 3 case(10%), fair 3 case(10%) and poor 5 case(16.66%). Conclusions : These results indicate that the effect of Boryungbosim-tang on the cough is excellent.

• Communications of the Korean Mathematical Society
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• v.32 no.1
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• pp.107-118
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• 2017

In this paper we study CR-submanifolds of maximal CR-dimension by investigating extrinsic behaviors of integral curves of characteristic vector field on them. Also we consider the notion of ruled CR-submanifold of maximal CR-dimension which is a generalization of that of ruled real hypersurface and find some characterizations of ruled CR-submanifold of maximal CR-dimension concerning extrinsic shapes of integral curves of the characteristic vector field and those of CR-Frenet curves.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1001-1002
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• 2017

2차원 바코드는 1차원 바코드의 데이터 용량의 한계를 극복하여 최근 많이 사용되고 있다. 복잡한 환경에서 바코드의 인식을 위해서는 바코드 영역 검출이 중요한 단계이다. 본 논문에서는 딥러닝 기법을 이용하여 QR코드 검출 시스템을 구현한다. 실험은 실생활에서 카메라로 촬영한 바코드 영상을 이용한다.

• Journal of the Korean Mathematical Society
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• v.36 no.1
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• pp.109-123
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• 1999

In this paper we prove a reduction theorem of the codimension for real submanifold of quaternionic projective space as a quaternionic analogue corresponding to those in Cecil [4], Erbacher [5] and Okumura [9], and apply the theorem to quaternionic CR- submanifold of quaternionic projective space.