• Journal of Pharmaceutical Investigation
• /
• 제9권4호
• /
• pp.8-12
• /
• 1979

A study on the effects of the root components of Angelica koreana Max. on voluntary activity in mice has confirmed that: 1. MeOH soluble Ex., MeOH insoluble Ex., oxypucedanine and isoimperatorin were antagonized against the voluntary activity in mice pretreated with a dose of C.N.B. 30mg/kg. 2. MeOH insoluble Ex. showed higher depressant effect than MeOH soluble Ex.. 3. the depressant activity of oxypucedanine was significantly more effective than that of isoimperatorin.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
• /
• pp.1534-1536
• /
• 2007

ZnS-based orange-emitting phosphors were synthesized by two-step firing process: above $1000^{\circ}C$ to obtain hexagonal phase, and at $750^{\circ}C$ for cubic phase. The effect of heat treatment condition on the optical properties was investigated to fine an optimum condition for high-performance ZnS:Mn,Cu,Cl phosphor.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
• /
• pp.1537-1538
• /
• 2007

ZnS:Cu,Cl phosphor was synthesized by solid-liquid state reaction with two firing steps. Each stage of the process was carefully monitored so that the final product was comparable to commercially-available phosphor. The effect of $Cu^{2+}-doping$ concentration has been investigated on the luminescence characteristics of ZnS:Cu,Cl blue-green phosphors for inorganic electroluminescent device.

• 대한화학회지
• /
• 제7권1호
• /
• pp.69-73
• /
• 1963

The basicities of 16 substituted azoxybenzenes have been measured by U.V. spectrophotometric method. The effects of substituents on the basicities are discussed in terms of Hammett's equation. The reaction constants, ${\rho}^X_Y$ and ${\rho}^Y_X$ , in a modified equation, log $K_{XY}/K_{\infty}={\sigma}_X{\rho}^Y_X+{\sigma}_Y{\rho}^X_Y$, are $2.46{\pm}0.12$ and $2.25{\pm}0.26$ respectively. The validity of the equation is analysed by a statistical method, and the structure of the conjugate acid of the substituted azoxybenzenes is proposed.

• Bulletin of the Korean Chemical Society
• /
• 제27권8호
• /
• pp.1203-1205
• /
• 2006

During the synthesis of 4-fluorobenzaldehyde via the SNAr reaction of 4-nitrobenzaldehyde with TBAF, it was found that an equivalent amount of TBAF could oxidize benzaldehyde to benzoic acid. The reaction of 4-nitrobenzaldehyde with tetrabutylammonium fluoride (TBAF) gave 4-nitrobenzoic acid in high yield. Depending on the reaction conditions, other aromatic aldehydes produced acids with fewer amounts of alcohols. However, this type of oxidation has limited practical applications. Nevertheless, the mechanism is quite different from the Cannizzaro reaction because the amounts of the acid salt and alcohol formed were different.

• 대한임상독성학회지
• /
• 제3권1호
• /
• pp.45-47
• /
• 2005

MCPP (2-(2-methyl-4-chlorophenoxy)propionic acid; mecoprop), a hormonal weedkiller has been widely used. Although chronic exposure is generally considered to be mildly toxic to man, acute intoxication can be severe and should thus be taken seriously. We report the case of a patient who died after ingestion of MCPP. A 64-year-old man ingested about 400 ml of $50\%$ MCPP solution. He was stuporous and had an inadequate respiration. He had an hypotension which did not respond to vasopressors and died about twelve hours after ingestion.

• 한국잠사학회:학술대회논문집
• /
• 한국잠사학회 2003년도 제46회 춘계 학술연구 발표회
• /
• pp.81-81
• /
• 2003

Male-specific protein (MSP) is a soluble protein which is accumulated in high amounts In the hemolymph and other organs of adult male wax moth. The MSP was purified from adult male wax moth by gel filtration and reversed Phase column chromatography, and its amino acid sequence was determined. Three internal amino acid sequences of MSP were obtained by the in-gel digestion method using trypsin because of its blocked N-terminus. (omitted)

• 한국공간구조학회논문집
• /
• 제17권4호
• /
• pp.69-76
• /
• 2017

For evaluating equations of bursting force in different codes, comparative study of the formulas was conducted. Because the equations does not consider variables such as shape of anchorages, angle of tendons, and eccentricity, a relation between the bursting forces and the variables has to be analyzed. In this paper, therefore, a comparative analysis of bursting forces computed by equations in the codes and finite element analysis was performed. As a result, it could be figured out that bursting force equations in the local zone were determined by coefficient k.

• 산업기술연구
• /
• 제15권
• /
• pp.169-174
• /
• 1995

A method of calculating the natural frequency corresponding to the first mode of vibration of beams and tower structures, with irregular cross-sections and with arbitrary boundary conditions was developed and reported by D. H. Kim in 1974. IN this paper, the result of application of this method to the laminated plates with axial forces and with attached point mass/masses is presented. Both $N_x$ and $N_y$ forces are considered. The solution for the laminated plates with arbitrary boundary conditions and irregular section can be obtained by simply obtaining the deflection influence coefficients by any method. The effect of neglecting the mass of the plates on the natural frequency, as the ratio of the point mass/masses to the plate mass increases, is thoroughly studied. The influence of $N_x$ and $N_y$ is also carefully investigated.

• 한국환경과학회:학술대회논문집
• /
• 한국환경과학회 2003년도 International Symposium on Clean Environment
• /
• pp.119-122
• /
• 2003

Quantitation methods of total petroleum hydrocarbons to determinate oil contaminated level in soil were discussed. Extraction characteristics of several pretreatment methods and practical detection limit and reappearances in gas chromatography/mass spectrometry. with each pretreatment method were investigated. The obtained results showed that the newly adopted quantitation method and mechanical shaking extraction method using methanol with extraction solvent are more practical and applicable to real sample than the conventional methods. In applying these methods to gasoline, kerosene, fuel oil which are major source of soil contamination, the practical quantitation limit and % relative standard deviation was able to determine with range of 2.5 - 10 ppm, 5 - 7 ％.