지진하중에 대한 다경간 교량의 비탄성 변위응답 평가

송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

To evaluate inelastic seismic reponses of multi-span bridge structures, the capacity spectrum method(CSM) incorporating the equivalent single-degree-of freedom(ESDOF) method is presented. Application of the CSM incorporating the ESDOF method is illustrated by example analysis for symmetric and asymmetric bridge structures. To investigate an accuracy of the CSM, the maximum displacements estimated by the CSM are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the CSM provided conservative estimates of the maximum displacements for the symmetric and asymmetric bridge structures, and the trend of conservative estimates of the asymmetric bridge structures was significantly larger than that of the symmetric bridge structure.

역량스펙트럼 방법을 이용한 철근 콘크리트 교각의 내진성능 평가

송종걸,장동휘,정영화 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

To evaluate seismic performance of reinforced concrete piers two procedures for capacity spectrum method are presented. The capacity spectrum procedures include the reduction factor-ductility-period(R_(μ)-μ-T)relationship in order to construct the inelastic demand spectra from the elastic demand spectra. Application of the procedures are illustrated by example analysis. Maximum displacements estimated by the procedures are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the maximum displacements estimated by the procedures are, on overall, smaller than those by the inelastic time history analysis.

등가단자유도 방법에 따른 다자유도 교량의 지진응답평가

송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

The capacity spectrum method(CSM) can be used for the evaluation of inelastic maximum response of structures and has been recently used in the seismic design using the incorporation of pushover analysis and response spectrum method. To efficiently evaluate seismic performance of multi-degree-of freedom(MDOF) bridge structures, it is important that the equivalent response of MDOF bridge structures should be calculated. To calculate the equivalent response of MDOF system, equivalent responses are obtained by using Song method, Fajfar method and Calvi method. Also, those responses are applied to CSM method and seismic performance of bridge according to the ESDOF method are compared and evaluated straightforwardly.

횡하중 분배방법을 이용한 교량구조물의 비탄성 변위응답 평가

송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

In order to evaluate seismic performance of multi-degree-of-freedom bridge structure, moderate lateral load distribution methods using the pushover analysis were developed by many researchers. One of important variables to improve an accuracy of pushover analysis is lateral load distribution. In this study, pushover analyses were performed using the five types of lateral load distribution and seismic performances were evaluated by capacity spectrum method (CSM). To verify an accuracy of suggested lateral load distribution, the maximum displacement estimates by the CSM were compared to those by inelastic time history analysis.

횡하중 분포와 등가단자유도 방법의 영향을 고려한 다경간 교량의 내진성능 평가

송종걸,남왕현,정영화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

To evaluate inelastic seismic responses of multi-span-bridge, the equivalent single-degree-of-freedom (ESDOF) methods and the lateral load distributions are applied to the capacity spectrum spectrum method(CSM). From the pushover analysis results using the four ESDOF methods and the six types lateral load distributions, the ESDOF method more than lateral load distribution is found to have an important influence upon the pushover analysis. The effects of the higher mode on the bridge seismic behaviors are also increased as the number of pier increase. Therefore, it can be concluded that lateral load distributions and ESDOF methods for reflection of higher mode effects should be considered in the seismic analysis of the bridge structural.

횡하중 분포와 등가단자유도 방법의 영향을 고려한 다경간 교량의 내진성능 평가

송종걸,남왕현,정영화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A

To evaluate inelastic seismic responses of multi-span-bridge, the equivalent single-degree-of-freedom (ESDOF) methods and the lateral load distributions are applied to the capacity spectrum method(CSM). From the pushover analysis results using the four ESDOF methods and the six types lateral load distributions, the ESDOF method more than lateral load distribution is found to have an important influence upon the pushover analysis. The effects of the higher mode on the bridge seismic behaviors are also increased as the number of pier increase. Therefore, it can be concluded that lateral load distributions and ESDOF methods for reflection of higher mode effects should be considered in the seismic analysis of the bridge structural.

甘草의 有效性分 含量에 關한 硏究

韓宗鉉,白承和,康成溶,宋昊埈 한국전통의학연구소 1997 한국전통의학지 Vol.7 No.2

시중에 유통되고 있는 4종류의 감초(특감초,원감초,일호감초,이호감초)에 대하여 유효약리성분 glycyrrhizin, 18α-glycyrrhetinic acid 및 glycyrrhizic ammonium salt의 함량을 대한약전의 규격기준에 준하여 검토한 결과는 다음과 같았다. 1. 감초의 수분함량은 7.00-10.16%범위 였다. 2. 감초의 회분 및 산불용성 회분 함량은 3.03-4.09%, 0.02-0.11 % 범위 였다. 3. 감초 품질의 지표성분인 glycyrrhizin,18α-glycyrrhetinic acid 및 glycyrrhizic ammonium sait 을 TLC로 각각 Rt값 0.399,0.932,0.394 위치에서 암자색의 반점을 확인할 수 있었는데 특 감초,원 감초,1호 감초,2호 감초 모두 같은 위치에서 뚜렷한 암자색 반점을 확인할 수 있었고,확인되지 않은 3종 화합 물의 Rt 값은 0.28,0.66,0.78 였다. 4. 감초품질의 지표성분인 glycyrrhizin,18 α-glycyrrhetinic acid 및 glycyrrhizic ammonium salt을 HPLC로 정량한 결과 glycyrrhizin은 4종류 감초에서 분석되어 2.93-4.48g% 범위였고, 18 α-glycyrrhetinic acid는 특감초 및 일호감초에서만 13.64,3.52 g% 함유되었다. 그러나 glycyrrhizic ammonium salt 분석되지 않았다. 5. 문헌상에 기록된 감초의 종류는 16종이었고 이들에서 분리된 화학물질은 약 170여 가지였다. This study was carried out to investigate the content of glycyrrhizin, 18 α-glycyrrhetinic acid, glycyrrhizic ammonium salt, moisture, ash, residue ash in four kinds(teuk-gamcho, won-gamcho, IIho-gamcho, Eho-gamcho) in Glycyrrhizae Radix(Glycyrrhiza sp.) used in Korea. The result were as follows ; The moisture content in four kinds of gamcho was ranged from 7.00-10.16%. The ash and ash of acid residue in all gamcho types ranged from 3.03-4.09% and from 0.02-0.11 %, respectivly. The glycyrrhizin, 18 α-glycyrrhetinic acid, glycyrrhizic ammonium salt in Teuk-gamcho, Won-gamcho, IIhogamcho, Eho-gamcho verified from line of dark purplue color by TLC and Rf value of glycyrrhizin, 18 α-glycyrrhetinic acid, glycyrrhizic ammonium salt were 0.399, 0.932, O. 394, respectivly, and the Rf value unknown compoud were 0.28, 0.66, 0.78. The glycyrrhizin, 18 α-glycyrrhetinic acid, glycyrrhizic ammonium salt content of all gamcho by HPLC were ranged from 2.93-4.48g%, 3.52-13.64g%, and trace, respectively. The 16 kinds of Glycyrrhiza (Licorice) were dassified, and that the identification about 170 chemicals were phamacology action substrate by reported references.

농업용수 수질기준 T-N 항목 설정을 위한 벼생육 실험

최선화,김호일,윤경섭,최이송,오종민 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

The present water quality standards for agricultural were established without considering the effects of water quality on the safety, growth, yield and quality of crops. This study was carried out to investigate the effects of irrigation water quality on the growth, yield, and grain quality of rice, and to acquire basic knowledges to set up water quality standards for irrigation. The field and pot experiments were conducted with irrigation water that was previously adjusted four concentrations (control, 5, 10, 20 ㎎/L) and six concentrations (control, 5, 10, 15, 20, 30 ㎎/L) by NH₄NO₃ solution and replicated three and four times with randomized block design, respectively. The results of this study showed that the inorganic nutrient of rice plant, rice protein contents and number of panicle tended to increase as the T-N concentration in irrigation water was increased. In addition, grain yield at T-N 10 ㎎/L and 20㎎/L were significantly higher than the control at the field experiment. From the pot experiment at T-N 30 ㎎/L, the percentage of head rice was slightly lower due to the increase of green kernel and white belly/core kernel.

환기팬 시스템의 소음 저감에 관한 실험적 연구

이종석,송화영,이동훈 서울産業大學校 2005 논문집 Vol.54 No.1

This paper introduces an experimental study for the noise reduction of a ventilating fan system. For the purpose of noise reduction of it, an absorptive duct silencer filled with a glass fiber has been conventionally utilized. However, a glass fiber has some disadvantages like hygiene and secondary pollution problems. In order to overcome these problems, in this paper, a perforated duct silencer has been applied to the ventilating fan system. For the designing of a perforated duct silencer, the transmission losses for various perforated panel systems are measured and compared with their sound absorption performances.

여행사의 서비스 품질 모형 설정에 관한 연구

이종화,한정문 全州大學校 大學院 1996 全州大 論叢 Vol.7 No.-

This study was aimed at establishing an evaluation model for service qualities of travel agencies based on the preceding studies. To this end, the concept and various evaluation models for general service quality were reviewed. Thereupon, considering the reality tht there exists no generalized view of the service quality of travel agency, it was attempted that a conceptual model would be established by extracting the evaluation factors for the service quality of travel agencies based on the preceding studies. The evaluation factors extracted were ① physical environment, ② species of package bur, ③ attitude of service, ④ contents of service, ⑤ capacity and ⑥ image. The attitude of service means that of the personnels who contact directly customers. Thus, most of the services offered by any travel agency belong to this category of human services. In this context, customers' impression with these human services may determine much of the service quality of travel agency. In this regard, the approaches to the management of travel business should be centered around human beings. In all the service quality of any travel agency is determined by the defference between customers' expectation of travel package or service and their actual after perceptation will be affected by individual customer's desire, past experience, other customer's imformation of traditional marketing activities, while the after-perception will be affected by various human, physical and technological factors. It is believed that the model established in this study would function as basic framework for a systematic understanding of various concepts concerning the service quality of travel agency as well as for evaluating / managing the service quality. However, this study may be limited in that the evaluation factors extracted from the preceding studies are not verified in emperical terms and thereby the model based on these factors may not be reliable. In this contect, it is hoped that further studies would be conducted to verify these evaluation factors of the service quality.