길경의 부탄올 분획으로부터 지표성분을 분리, 정제하기 위해 SiO2 컬럼크마토그래피를 실시한 결과 1종(화합물 1)의 단일 물질을 순수 분리하였으며 화합물 1의 구조는 1H, 13C NMR 등 분광학적 관측 결과 platycodin D로 확인되었다. Platycodin D의 HPLC 정량법을 검토한 결과, 검출기는 증기화광산란검출기(ELSD)를, 컬럼은 역상컬럼을 사용하여 길경 MeOH 추출액으로부터 효율적인 지표성분 정량이 가능하였다. 추출조건을 재검토한 결과 환류추출보다는 초음파 추출이 더 효율적이었으며 추출용매로는 80% MeOH이 다른 용매조건보다 추출효율이 우수하였다. 건조조건의 검토에서는 platycodin D의 함량이 양건이나 양건과 건조기 혼용건조 보다 건조기 단독 건조시 더 높았으며 특히 60℃ 열풍건조에서 그함량이 0.083%로서 가장 높았다. 묽은 에탄올 엑스 함량도 건조기만을 이용한 열풍건조가 양건과 건조기 열풍건조를 혼용한 방법보다 4% 정도 더 높았다.

Photocatalytic degradation of phenol was carried out with UV-illuminated TiO2- SiO2 in aqueous suspension. TiO2-SiO2 catalysts were prepared by sol-gel method from the titanium isopropoxide and tetraethylorthosilicate at different Ti/Si ratio and some commercial TiO2 catalysts were used as purchased. All catalysts were characterized by X-ray Diffraction(XRD) and BET surface area analyzer. The effect of reaction conditions, such as initial concentration of phenol, reaction temperature and catalyst weight on the photocatalytic activity was studied. In addition, TiO2-SiO2(49:1) prepared by sol-gel method showed higher activity than commercial TiO2 catalysts on the photocatalytic degradation of phenol. The addition of SiO2 into TiO2 hepled to increase the thermal stability of titania which suppressed the formation of anatase into rutile. The photocatalytic degradation of phenol showed pseudo-1st order reaction and the degradation rate increases with decreasing initial phenol concentration.

ZnS 박막을 Hot W긴 법에 의해 증발관 온도, 기판온도 및 외부로부터 유황(5)의 공급을 변수로 하여 제작하여 광학적, 결정 구조적 특성을 분석 ·검토하였다 박막의 증착속도는 증발관 온도 및 5 증기압을 높일수록 증가하였으나 기관온도를 높이면 급격히 감소하였다. 박막의 광학적 특성은 증착속도와 밀접하게 관계하고 있다고 사료되며, 실온에서의 금지대 폭은 이론 값보다 작은 3.46∼3.72ev를 나타내어 결정 중에 결함이 존재함을 알 수 있었다. 박막의 구조를 분석한 결과 어느 경우에 있어서나 섬아연광 구조의 (111) 주 배향성을 나타내었으나 회절피크의 강도 및 반치폭으로부터 결정성은 대체로 양호하지 못했음을 알았다. 그러나, 기판온도 또는 5 공급 등의 제작조건에 따라 광학적, 결정적 특성이 개선되었다.

수치시뮬레이션 기법 중 하나인 SMAC법은 시간의 변화에 따른 유동의 현상을 해석하기 위해 MAC법을 수정 한 기법이다. 비압축 점성 흐름을 풀기 위해 Navier-Stokes 방정식을 사용하였으며, 유동을 가시화하기 위해 마커입자가 사용되었다. 본 연구에서는 SMAC법을 사용한 2차원 물기등 붕괴현상의 수치시뮬레이션을 수행하였으며, 시뮬레이션 결과는 Martin과 Moyce의 실험 결과 및 MPS법의 계산결과와 비교하였고, 좋은 결과가 얻어졌다. 또한

Although the ports are actually competing with various strategies, the definition and structural understanding of port competitive power are not known very much. Therefore this study has launched from this fact, and has the objective of obtaining the structural model of the competitive power, and understanding the components of the port competitive power. The following are the results of the study. First, the process began by abstracting the components that composed the port competitive power through recent research, and grouping it by the most core components using the KJ method. Also, by using the FSM(Fuzzy Structural Modeling) method to understand the structure of the grouped components, and the structural model of the port competitive power was able to obtain as the result. Second, when analyzing the obtained structural model, port expenses, main trunk location, port congestion and port facility came out to be the most important component groups, and especially port expenses was the most effective component that effected all the other components overall. Third, the component groups that were relatively less important, effected by most of the other components, and located on the top level of the structure model were the hinterland accessibility, port ownership, customs duties speed, and large ship port entrance possibility etc. Fourth, the results of this study will be able to be used when establishing competing strategies for our country's ports by proposing the relatively important components with the port competitive rower considered.

A new technique to grow a manganese-doped zinc-sulfide(ZnS：Mn) has been proposed using the repeated deposition of the Hot Wall method. The optical characteristics and crystallinity for the ZnS and ZnS：Mn thin films deposited on a quartz glass substrate by the method were investigated. Also, The ZnS：Mn thin film elcetroluminescent devices were fabricated by the method to study luminescence characteristics. All films showed (111)-oriented cubic structure. By the repeated deposition, the deposition rates were decreased, and the optical characteristics and crystalline properties were improved, which clarifies that the method is effective to deposit the thin films with good crystallinity Futhermore, the crystallinity was more improved by the doping of Mn. Only one peak emission at around 585nm originating from Mn luminescent center is observed In the photoluminescent and electroluminescent spectra of ZnS：Mn films and the luminance of the ZnS：Mn-based thin film electroluminescent devices was obtained below 60cd/m2 . The optical and crystalline properties, luminescence characteristics are discussed in terms of the effects of the repeated deposition and Mn-doping.

간편하고 효과적인 정유성분 분석을 위해 SPME fiber를 선별하고 산초와 초피의 개체 정유성분 분석에 적합한 SPME fiber를 찾고자 실험한 결과는 다음과 같다. 단일물질별 흡착율은 PDMS, PDMS/DVB, CAR/PDMS 가 우수했다. 10종의 단일물질 표준품 혼합액 흡착 실험에서 직접주입 했을때와 가장 유사한 결과를 보인 것은 PDMS, PDMS/DVB fiber이였다. 최종 선발된 PDMS와 PDMS/DVB를 이용하여 24종의 단일물질 표준품 흔합액 흡착과 직접주입시를 비교한 결과 이들 간에 차이가 없었다. 또한 GC주입구의 split ratio별 성분의 검출에서도 차이가 없었다. 흡착시간이 길어질수록 분자량이 큰 성분의 흡착율이 높아지는 경향을 보였지만, 직접주입시와 비교해 볼 때 적절한 흡착시간은 30-40분이였다. SDE 추출물을 이용한 산초와 초피나무 개체 정유성분 분석에는 산초와 초피 모두 PDMS/DVB가 흡착시간 30-40분에서 분자량이 큰 sesquiterpene류까지 흡착하는데 유리하였다.

흘란다이트 터널 구조내의 A자리 양이온인 Ba2+ 이온을 K+ 이온이 치환하면서 결정의 구조에 어떠한 변화가 있는지 알아보기 위해 K-Ba 전구간 완전고용체로 치환된 7개의 합성 흘란다이트형 광물(K2x Ba1 -x/Cr2Ti6 O16 , x=0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0)에 대하여 X선 회절분석과 리트벨트 구조분석법을 실시하였다. 리트벨트 계산 결과, 구조의 정밀도를 나타내는 R 지수값을 보면 Rexp에 대한 Rwp 값(Rwp /Rexp )은 15.77%/20.90%~14.74%/l9.37%의 범위를 보여주며, RB 값은 6.45~8.97%, S (GofF)값은 1.45~l.63으로 각각 계산되었다. 합성 홀란다이트는 K-Ba 전구간에서 Ba의 함량에 관계없이 모두 공간군 14/m을 가지며, 단위포의 크기는 a=10.1194(2) ~ 10.0599(2)a, c=2.9572(6)~2.9512(7)a, V=302.75~298.66a3의 범위를 보여주며, K 함량이 50% 이상에서는 금홍석이 부산물로 합성되었다. 그 결과 A자리의 Ba와 K의 치환관계에서는 비록 단위포의 크기에 일정한 변화를 보여주었으나 구조적 변이에 영향을 주기에는 충분치 않은 것으로 밝혀졌다. 따라서 정방정계에서 대칭성이 낮은 단사정계로의 구조적 변이는 A자리에 대한 K-Ba 치환보다는 다른 양이온의 치환이나 B자리의 치환 등 다른 요인에 의할 것으로 생각된다.다.

이성분 희토류 원소로 치환된 4종류의 합성불화인회석(synthetic fluorapatite) (Ap49: La+Gd, Ap50:Ce+Dy, Ap51: Pr+Er, Ap54: Eu+Lu; Ca10-x-2y Nay REEx+y(P1-x //Six 4)6 F2, x=0.13~0.12, y=0.26~0.42)을 대상으로 X-선 회절분석을 통해 얻어진 자료를 이용하여 리트벨트 구조분석을 실시하고 치환된 희토류원소의 거동을 단결정법으로 구해진 결과와 비교.분석하였다. 리트벨트 구조분석결과 합성불화인회석은 공간군 P63/m, 단위포는 평균하여 a=9.3906(1) a, c=6.8924(1) a, V=527.36 a3의 값을 갖는다. 구조의 정밀도를 나타내는 R 지수를 보면 RB / 값은 17.29~18.80이고 S(GofF)값은 1.44~1.68로 계산되었다. 불화인회석은 9개의 산소를 배위하는 Ca1자리와 6개의 산소와 하나의 불소가 배위하는 Ca2자리가 있으며 Ca1-O의 평균거리는 2.563 a이고 Ca2-O의 평균거리는 2.460 a으로 Ca1자리가 Ca2자리보다 다소 크다. 구조자리 치환식에서는 Ca2+ / 자리를 치환하는 REE3+ 로 인하여 전하균형을 맞춰주기 위해서 인과규소가 함께 참여하였다. (REE3+Si 4+ 2Ca2+ : Ca1) 계산된 희토류원소의 자리점유율(REE-Ca2/REE-Cal)은 원자번호가 증가함에 따라 일정하게 감소하는 경향을 보여주며 이는 희토류원소의 거동이 LREE는 크기가 상대적으로 작은 Ca2 자리에 우선 치환되고 HREE는 크기가 큰 Ca1자리에 우선 치환되는 경향을 지시한다.

In port management, the scale of facilities and port layouts are major factors characterizing the port, which influence port economics and productivities continuously through the port operation. Grouping ports in certain region by their characteristics could be used as the principal informations to establish national policy for port development or investment and also to analyze the competitiveness between ports. Currently Korean ports are divided into two groups such as the local port and the designated port containing foreign trade port and coastal port under the Korean port law. These divisions seem to be used for port administration as the matter of convenience but some qualitative grouping is needed for research of port problems. In this paper, 20 major Korean ports were clustered by the similar characteristics using Fuzzy C-Means and found to be classified 8 qualitative groups.

Centralized safety stock in a periodic replenishment system which consists of one central warehouse and m regional warehouse can reduce backorders allocating the centralized safety stocks to regional warehouse in a certain instant of each replenishment cycle. If the central warehouse can not monitoring inventories in the regional warehouse, then we have to predetermine the instant of allocation according to demand distribution and this instant must be same for all different replenishment cycle. However, transition of inventory level in each cycle need not to be same, and therefore different instant of the allocation may results reduced shortage compare to the predetermined instant of allocation. In this research, we construct a dynamic model based on the assumption of monitoring inventories in the regional warehouse everyday, and develop an algorithm minimize shortage in each replenishment cycle using dynamic programming approach.

In this thesis the legal systems related to real estate and sea area utilization are studied in order to improve them for construction of Very Large Floating Structure. Main research subjects are as follows: 1) Whether can Very Large Floating Structure be accepted or not as real estate like house and land\ulcorner 2) How can the sea area which is occupied by Very Large Floating Structure be utilized\ulcorner As the conclusion, the Very Large Floating Structure can be registered as real estate even though it is not specified by Korean law for the present. The design concept of Very Large Floating Structure can be interpreted as satisfying enough necessary conditions and factors for Very Large Floating Structure to become real estate. In the near future, we have to make improvement on the laws related with the construction of Very Large Floating Structures so that private sectors can joint the construction. In additions, a new law for various floating structures should be made as soon as possible.

In this study, the regional frequency analysis is used to determine each subbasin drought frequency with reliable monthly precipitation and the L-Moments method which is almost unbiased and has very nearly a normal distribution is used for the parameter estimation of monthly precipitation time series in Nakdong river basin. As the result of this study, the duration of '93-'94 is most severe drought year than any other water year and the drought frequency is established as compared the regional frequency analysis result of cumulative precipitation of 12th duration months in each subbasin with that of 12th duration months in the major drought duration. The Linear regression equation is induced according to linear regression analysis of drought frequency between Nakdong total basin and each subbasin of the same drought duration. Therefore, as the foundation of this study, it can be applied proposed method and procedure of this study to the water budget analysis considering safety standards for the design of impounding facilities large-scale river basin and for this purpose, above all, it is considered that expansion of reliable preciptation data is needed in watershed rainfall station.