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energy band structure of Gap is calculated by the empirical pseudopotential method. The Lowdin Brust perturbation theory is considered to reduce matrix size of the secular equation. For these calculations the matrix size(∼15×15) is smaller than in the CB(∼20×20) case and J.R. Chelikowsky etal. case (∼30×30). Form factors are decided from reflectivity spectra, ultraviolet photoemission spectra(UPS) and x-ray photoemission spectra (XPS) data. Reflectivity data is well explained by these calculations. The agreements of theory and experimental data of UPS and XPS are improved by considering effective mass.
This paper describes the formulation for the analysis of the free vibration of cylindrical shell panels with stiffeners by the transfer influence coefficient method. This method was developed on the base of the successive transmission of dynamic influence coefficients. The simple computational results on a personal computer demonstrate the validity of the present method, that is, the numerical high accuracy analysis method and the flexibility for programming, compared with results of the transfer matrix method. We also confirmed that the present algorithm could obtain the solutions of high accuracy for system with stiffeners.
多頂方정式에 關한 많은 問題들이 Groebner 基底의 方法에의하여 解決이 되고 道具로서 强力한 컴퓨터 代數 시스템이 開發되어 利用되고 있다. 本 論文의 2장에서는 Groebner 基底의 性質을 把握하고, 3장에서는 이데알의 飽和를 정의하고 그것을 計算할 수 있는 알고리즘과 몇 가지 性質을 硏究하였다. 또한 飽和를 利用하여 이데알의 根基 構成員 여부를 알아보는 判定法에 관한 알고리즘과 縮小Groebner 基底를 計算하여 解決할 수 있는 方法을 記述하였다.
We study markup adjustment of leading Korean export goods, which are categorized by HSK 6-digit criteria. A dummy variable regression model is adopted in order to take into account asymmetrical markup adjustments. Test results verify asymmetrical markup adjustments in Korean export goods. Markup adjustments are observed more frequently when the value of the Won decreases. In this study, we also find a relationship between markup adjustment and final destination of export goods. Markup of export goods to the USA has a tendency to be adjusted when Won value decreases. However, markup adjustment of goods exported to China has symmetrical characteristic relative to goods exported to other final destinations.
In this paper, we degined sliding mode controller for discrete-time multivariable systems with unmeasurable state variables. Practical control systems are usually realized by digital computer. And there has existed a gap between the continuously designed VSCS (Variable Structure Control System) and the realized control systems. So, we propose the sliding mode control theory which are extended from continuous VSCS theory for controlling the discrete systems. And the previous sliding mode control theory assumed that the systems have all of measurable state variables. However, in practical systems, all state variables are not measurable. Thus, in this paper, we also investigate the discrete system there not all states are available for switching function synthesis or control. In all the case, computer simulation results are presented to demonstrate the effects of theories.
미강유를 35와 65℃에서 36일간 저장 중 미강유의 지방산 조성과 산화에 의한 off-flavor의 변화를 측정하고 산화에 의해 생성된 몇 가지 대표적인 off-flavor와 peroxide value 간에 상관관계를 연구하였다. 35℃에 저장한 미강유는 유도기의 과정을 거쳐 서서히 산화하는 반면 65℃에 저장한 미강유는 유도기의 과정이 없이 산화하여 유지의 산패취의 주요 휘발성 물질인 aldehyde를 과량 생성하였고 그 외에 휘발성분으로 유기산, hydrocarbons, alcohols, ketones가 동정 되였다. 지방산의 감소와 자유지방산의 생성 및 감소는 휘발성 성분의 변화에 높은 상관관계가 나타났으며 peroxide value 보다는 aldehyde 성분이 관능검사에 많은 영향을 주었다.
The first 7 years of altimeter data from the TOPEX/POSEIDON(T/P) were analyzed to study the surface circulation and its variability in the East Asian Marginal Seas. Long term averaged T/P sea level time series data where compared with in situ sea level measurements from a float-operated type tide gauge around of south Korea and Japan. T/P data are a large contaminated by 60-day tidal aliasing effect, very near the alias periods of M₂and S₂When this 60-day effect is removed, the data agree well with the tide gauge data with 4.6cm averaged RMS difference. The T/P derived sea level variability reveals clearly the well-known, strong current-topography such as Kuroshio current. The T/P mean sea level of North Pacific (NP) was higher than Yellow Sea (YS) and East Sea (ES).The T/P sea level valibility, with strong eddy and meandering, was the largest in eastern part of Japan and this variability was mainly due to the influence of bottom topography in Kuroshio Extention area.
The purpose of this paper is to suggest a new approach to syllable structure, which can show the whole processes of stress shift and vowel alternations. The approaches I have attempted to show in this paper are three types, these being rule-based, prosodic, and harmonic approaches. However from the comparison of existing methods we can find a few problems in dealing with stress shift and vowel laxing compositely. They dealt with the syllable just partially on the linear, which made us overlook the other important phenomena in the syllable structure. When we look at the stress movement, it causes the vowel lax or tense. Therefore the words related with the phenomena will be dealt with consideration to dual sides. Now this paper will adopt the level approach to show more appropriate explanation than the existing analysis.
This study tests the difference of pricing of foreign currency risks between the Korean stock market and the New York stock market. Test results show that foreign currency risk is priced in the Korean stock market after foreign currency crisis. However, the foreign currency risk is not priced in the New York stock market during the same periods. These results means that the foreign currency risk is a systematic risk in Korean stock market, but the foreign currency risk is an unsystematic risk in New York stock market. This study result suggests that the Korean company exposed in foreign currency risk could increase its value by listing in the New York Stock Exchange.
The objective of this thesis is to discuss the Fire of the Ship in the International Logistics. Damage to cargo by the Fire of the ship is covered by ICC(A), ICC(B), ICC(C), A/R, W/A, FPA. But if a damage occurs to cargo from a latent ship defect, seaworthiness, war perils, it is nessary to acquire knowledge of marine insurance contract and transport contract in the international logistics.