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A Study on the Auto-tracking Antenna System Mounted on Vehicle for DBS Reception
No full textIn this dissertation, a DBS (Direct Broadcasting from Satellite) reception system mounted on vehicle is proposed and implemented, which is composed of the slotted waveguide array antennas, the satellite tracking mechanical gear part, antenna position control circuits to track satellite signal. The antenna for mobile DBS reception is automatically controlled by the tracking algorithm with high resolution. Then, the characteristics of the auto-tracking antenna system for the DBS reception with high quality in a driving vehicle. As a result, the performance of the proposed system mounted on a car and a ship has been confirmed by the field test. To achieve the above purpose, the methods of antenna design including waveguide feeder and antenna beam tilting angle control, IF coupling circuit design to prevent a twist of feed line between antenna and tracking control circuit, and development of the high resolution algorithm to improve the tracking speed and the stability are proposed and studied in detail.
~This dissertation is composed of six chapters. The substance for each chapter is as follows~Chapter 1 describes a antenna history for the DBS reception and a background including research target of this study.
~Chapter 2 presents a design for a single-layer feeder waveguide array using π-junctions with the inductive wall. The feed structure consists of a single waveguide placed on the same layer as radiating waveguide and is characterized by a unit divider, called a π-junction. This π-junction with an inductive wall splits part of the power into two branches waveguide through one coupling window, and can excite densely arrayed waveguide at equal phase and amplitude. The power dividing characteristics of the cascade of π-junctions are analyzed by Galerkin's method of moments. The numerical results show reasonable agreement with the experimental results. From the optimum simulation results based on the feeder waveguide using π-junction,~the scattering matrices of the feeder divided power are obtained. It can be applied for 2n-way power divider.
~In the Chapter 3, the 16-port feed waveguide array with inductive walls analyzed by Galerkin`s method of moments are proposed for the DBS reception system mounted on vehicle. First of all, in order to verify the validity of electromagnetic analysis and design for a π-junction feed waveguide, it is designed and fabricated at DBS band. The measurement results of a π-junction feed waveguide agree well with the theoretical ones. Based on this design method, an array design for WR-90 standard waveguide is conducted. Since the width of a π-junction feed WR-90 standard waveguide is larger than a guided wave length in an array design, the difference of amplitude and phase of 8-port array are calculated 2.3 dB and 62 degrees, respectively. The bandwidth with return loss of -20 dB below is about 220 MHz and it doesn't satisfy DBS band. To solve this problem, we propose a novel design that the width of a π-junction feed waveguide equals to a guided wave length. By the proposed novel design for 8-port feed waveguide array, the difference of amplitude and phase are decreased 1 dB and 13 degrees, respectively. The broad bandwidth of 700 MHz is also realized. The size of 16-port waveguide array compared with WR-90 array is reduced about 10 cm. The measured antenna gain for the fabricated 16-port feed waveguide array is observed 24 dBi above at DBS band.
~Chapter 4 describes the characteristics of beam-tilting slot array waveguide~antennas and super low noise LNB for mobile DBS reception. As a basic study of slotted waveguide array, design for 16 slot elements located on a broad-wall waveguide is considered. Design parameters such as slot length, space between each slot and cross slot angle of antennas with the beam-tilting characteristics are calculated by method of moments. Based on these results, the radiation waveguide antennas with 16-element × 16-array are designed and fabricated. The measured main beam direction angles of the fabricated antennas are 48° to 50° depending on the measured frequencies and it shows good agreement with prediction. The measured 3 dB beam width of elevation pattern is about 13°, and the axial ratio and the gain measured at DBS band are observed 2.8 dB below and 24 dBi above, respectively. The high performance LNB is also designed and fabricated. It has a conversion gain of 65 dB, a gain flatness of 2 dBp-p, a noise figure of 0.7 ~ 0.9 dB, and a phase noise of about -100 dBc/Hz at 100 kHz. In order to evaluate a performance of the fabricated waveguide planar antenna and super low noise LNB, it is combined with the satellite tracking control system and the field performance test of antenna mounted on a mobile vehicle is carried out at highway. During the measurement, we confirmed that it was possible to watch television without a break signal in a driving vehicle and an excellent performance of the proposed antennas and LNB was demonstrated.
~Chapter 5 describes the performance of a satellite tracking antenna control system for mobile DBS reception and the characteristics of IF coupling circuit for prevention of wire twist occurred by system turn. In order to improve the tracking speed and the stability of this system, a directional sensor function is added to a conventional left-right tracking algorithm. The satellite tracking experiments of the fabricated antenna system for the DBS reception have been performed at a highway and an urban area. The measured AGC signal level on the highway was observed above the level to watch television. Therefore, an excellent performance of the hardware system with the tracking algorithm compensated for the directional sensor was confirmed.
~Chapter 6 describes an important summary of~the research results for leaky-wave slotted array waveguide antenna, super low noise Ku-band LNB, auto tracking control circuit and algorithm, and field test of the proposed DBS reception system.목차
Nomenclature = iii
Abstract = iv
List of Tables = vi
List of Figures = vii
제1장 서론 = 1
1.1 연구의 배경 = 1
1.2 연구의 목표 = 3
1.3 연구의 범위 = 5
제2장 유도성 벽을 이용한 π 분기형 일층구조 급전도파관 어레이의 설계 = 8
2.1 서론 = 8
2.2 π 결합 분기형 급전 도파관의 설계 = 9
2.2.1 유도성 벽을 가지는 π 결합 분기기 = 9
2.2.2 종단벽을 가지는 π 결합 분기형 급전 도파관 = 15
2.3 π 결합 분기기 한 단의 제작 및 측정결과 고찰 = 17
2.4 8-Port 전력 분기기의 어레이 설계 = 19
2.4.1 어레이 급전 도파관의 구조 = 19
2.4.2 3.95 GHz에서의 최적설계에 따른 주파수특성 = 20
2.5 결과 및 고찰 = 23
참고문헌 = 23
제3장 차량 탑재형 DBS수신 시스템용 16포트 급전 도파관 어레이 = 24
3.1 서론 = 24
3.2 WR-90을 이용한 π 분기 한 단의 설계·제작 및 측정 = 25
3.2.1 해석 모델 = 25
3.2.2 시뮬레이션 및 측정결과 고찰 = 26
3.3 16포트 어레이 급전 도파관의 설계 = 29
3.3.1 어레이 급전 도파관의 구조 = 29
3.3.2 WR-90 표준 도파관을 이용한 어레이 설계 = 30
3.3.3 새로운 타입의 급전 도파관 어레이 설계 = 33
3.3.4 급전 도파관의 제작과 성능평가 = 37
3.4 결과 및 고찰 = 38
참고문헌 = 38
제4장 DBS 수신용 빔 틸트형 슬롯 어레이 도파관 안테나의 특성 = 40
4.1 서론 = 40
4.2 16소자 어레이의 설계 = 41
4.2.1 크로스 슬롯 안테나의 구조 = 41
4.2.2 슬롯의 사이각 설계 = 42
4.2.3 슬롯의 길이와 슬롯 사이의 간격 = 43
4.2.4 지향성 패턴 설계 = 44
4.3 16소자 × 16열 도파관 안테나의 실험 및 고찰 = 46
4.3.1 안테나의 제작 = 46
4.3.2 근방계 측정 = 47
4.3.3 지향성 패턴 = 51
4.3.4 이득 = 52
4.4 Super Low Noise Ku-Band LNB = 53
4.5 필드측정 = 60
4.6 측정결과 및 고찰 = 61
참고문헌 = 61
제5장 차량용 DBS 수신을 위한 위성 추적 안테나 제어 시스템의 구현 및 평가 = 63
5.1 서론 = 63
5.2 위성 추적 안테나 제어 시스템의 구현 = 64
5.2.1 시스템의 구성 = 64
5.2.2 추적 알고리즘 = 70
5.3 Field 측정 결과 및 평가 = 76
5.3.1 실험환경 = 76
5.3.2 고속도로에서의 측정결과 = 76
5.3.3 도심지역에서의 측정결과 = 78
5.4. 평가결과 = 79
참고문헌 = 79
제6장 결론 = 81
본 연구와 관련된 발표 논문 및 특허 실적 = 8
(A) Study on Corporation System in Chinese Law
Full text linkThis thesis is a comparative study on Corporation System in China and Corporation System in Korea. The author tries to find out the similarities and differences. also legal principal differences from the two systems.
In the respect of Chinese Corporation System, the study bases on Chinese Corporation Law in cooperation with Corporation Law in China, which issued in December, 1993, and other related laws and regulations, such as the Corporation Standardizing Suggestions, the Joint-Venture Corporation Law of People's Republic of China, and the Corporation Registration Management Methods of People's Republic of China. Chapter 1 is the introduction. Chapter 2 is the stimulation and structure of China Corporation Law. Chapter 3 discusses the categories of Chinese corporations. The core of this thesis lies in Chapter 4, it is a complete discussion and analysis of Chinese cooperation system. It includes the foundation, the capital system, the stock and stockholders, the functional bodies, the bonds, the accounting methods, the change of stock prices, the merger and division, the change of organizations, the bankruptcy, the winding up, the liquidation, and the penalty regulations. Chapter 5 is the conclusion.
According the conclusion, the author gives six suggestions as follows:
(1) The Chinese Corporation Law needs consolidation. It is more comprehensive to add omitted laws, orders, and regulations which concerning corporation affair, The only statute is not enough. Also, principle and justified customs should be incorporated.
(2) It is necessary to increase corporation categories. In China, as one of supplementary forms, stock cooperation companies exist widely except private companies and stock corporations, it should be accepted and embodied in statute. Besides, the application scope of one man company should be enlarged.
(3) The foundation conditions of Corporation need to be loosen. While, in order to be against the abuse of the condition regulation, it is necessary to issue strict inspection system.
(4) The voting regulations of board need to be ameliorated. It is suggested to stimulate the member number and the ratio of voting rights.
(5) The rights of minor stockholders must be protected. It is not enough to only stimulate the rights of stockholders, the specific procedure of the guarantee of rights also needs to be stimulated.
(6) The stimulation of organizations needs to be amended. In respect to Chinese Corporation Law, the rights of "General Manager" need to be identified. Furthermore, it is not enough to only stimulate the rights of inspection bureau, the specific procedure of the guarantee of rights also needs to be stimulated.Abstract = ⅳ
中·韓會社法律用語對照表 = ⅵ
제1장 序論 = 1
제1절 硏究의 目的 = 1
제2절 硏究의 範圍 및 方法 = 3
제2장 中國會社法의 制定과 그 構造 = 4
제1절 中國會社法의 制定 = 4
Ⅰ. 過去 中國의 會社制度 = 4
Ⅱ. 中華人民共和國 會社制度의 變遷過程 = 5
제2절 中國會社法의 構造 = 7
Ⅰ. 會社法의 內容 = 7
Ⅱ. 會社法의 特徵 = 9
제3장 會社의 種類 = 12
제1절 會社와 企業 = 12
Ⅰ. 會社와 公企業 = 12
Ⅱ. 會社와「합화기업」 = 13
제2절 會社法上의 分類 = 14
Ⅰ. 有限會社와「國有獨資公司」 = 15
Ⅱ. 株式會社 = 23
제3절 特殊形態의 會社 = 23
Ⅰ.「外商投資企業」 = 24
Ⅱ. 外國會社의 支社 = 24
Ⅲ. 商業銀？？ = 25
Ⅳ.「고빈합작공사」 = 25
제4장 中國會社法上의 株式會社 = 27
제1절 株式會社의 設立 = 27
Ⅰ. 設立의 特徵 = 27
Ⅱ. 設立方式 = 30
Ⅲ. 設立 節次 = 30
Ⅴ. 國有企業에서 株式會社로 轉換 = 40
제2절 株式會社의 資本制度 = 45
Ⅰ. 資本의 意義 = 45
Ⅱ. 資本의 立法原則 = 45
Ⅲ. 最低資本金 = 48
Ⅳ. 資本의 增加와 減少 = 49
제3절 株式과 株主 = 50
Ⅰ. 株式 = 51
Ⅱ. 上場會社 = 57
Ⅲ. 株主 = 58
Ⅳ. 一人會社 = 62
제4절 株式會社의 機關 = 66
Ⅰ. 株主總會 = 66
Ⅱ. 業務擔當機關 = 69
Ⅲ. 監事會 = 75
제5절 株式會社의 社債 = 78
Ⅰ. 社債의 意義 = 78
Ⅱ. 社債의 特性 = 79
Ⅲ. 社債의 種類 = 80
Ⅳ. 社債發行의 條件 = 81
Ⅴ. 社債發行節次 = 82
제6절 株式會社의 計算 = 82
Ⅰ. 財務諸表 = 82
Ⅱ. 財務會計의 公開化 = 83
Ⅲ. 稅後利潤分配 = 84
제7절. 株式會社定款의 變更 = 86
Ⅰ. 定款變更의 意義 = 86
Ⅱ. 定款變更의 節次 및 效力의 發生 = 86
제8절 株式會社의 合？굅？ 分割 및 組織變更 = 87
Ⅰ. 會社의 合倂 = 87
Ⅱ. 會社의 分割 = 90
Ⅲ. 會社의 組織變更 = 93
제9절. 株式會社의 破産, 解散과 淸算 = 94
Ⅰ. 破産 = 94
Ⅱ. 解散 = 95
Ⅲ. 淸算 = 98
제10절 罰則 = 100
Ⅰ. 罰則의 意義 = 100
Ⅱ. 罰則의 特徵 = 101
Ⅲ. 罰則의 形式 = 102
Ⅳ. 罰則의 基本內容 = 102
제5장 結論 = 104
參考文獻 = 10
(A) Study on the Redundancy Optimization Problems in Series-Parallel System
Full text linkThis paper is concerned with finding the global optimal solutions for the redundancy optimization problems in series-parallel systems. This study transforms the difficult problem, which is classifed as a nonlinear integer problem, into a 0/1 IP(Integer Programming) by using binary integer variables. And the global optimal solution to this problem can be easily obtained by applying GAMS (General Algebraic Modeling System) to the transformed 0/1 IP. From computational results, we notice that GA(Genetic Algorithm) to this problem, which is known as a best algorithm until now, is very poor in many cases.Abstract = ⅱ
Ⅰ. 서론 = 1
1.1 기호 = 4
1.2 연구배경 및 목적 = 5
1.3 연구범위 = 7
Ⅱ. 0/1 변수 변환을 이용한 해법 = 8
2.1 직렬 시스템에 대한 0/1 변수 변환 = 8
2.2 직렬-병렬 구조 시스템에 대한 0/1 변수 변환 = 10
2.3 예제 = 12
Ⅲ. 전산 실험 결과 = 19
Ⅳ. 결론 = 22
부록 = 23
참고문헌 = 2
An Empirical Study on the Purchasing Behavior of Private car based on Life style
Full text linkThe marketing strategy of enterprises on the object of specific group has recently tended to be increased and the special group as like the professional soldier has no exception, and the various merchandises and the marketing of service at the target of the professional soldier have been increased, but the study on the life style or purchasing behavior of professional soldier can be considered to be weak.
Accordingly, the purpose of this study is to classify the type of life style of professional soldier, to clarify the difference of purchasing behavior upon the life style, and then to suggest the marketing-suggestive point of analysis results, and thus to offer the basic data to the enterprise and person in charge who establish the marketing strategy on the object of professional soldier and moreover to utilize it as the basic data in the setting-up of military welfare policy.
For the data collection of this study, 300 copies of questionnaire were distributed to the professional soldier over the vice-officer of navy who has worked in the city of Jinhae, Korea, and then collected its 251 copies and then actually used the questionnaire of 220 persons for the analysis.
The collected data was analysed by use of SPSS Statistics Analysis Program.
First of all, the frequency analysis was used to check the characteristics of sample of replier, and the factor analysis was carried out to examine the propriety between each variables, and the cluster analysis to clarify the life style.
And, The ANOVA and cross tabulation analysis were used to find out the difference between life style type group and the purchasing behavior.
The results of this study are as shown in the followings.
Firstly, There are distinguished life style between the professional soldiers.
Secondly, The purchasing motive of traffic inconvenience release and trip/leisure desire satisfaction partly has a significant difference in the respects of purchasing motives. ( Problems Recognition Stage )
Thirdly, The degree of influence by the advertising element ( Information Searching Stage ) has no significant difference, but it is appeared which the advertising effect by the personal element as like the oral way was big in 4 life style types.
Fourth, There is the significant difference statistically only about the design with regard to the difference of importance ( Countermeasure Valuation Stage ) in the purchasing.
Fifthly, The difference of purchasing behavior ( Purchasing Decision Stage ) does not show the significant difference, but the private car seemed mostly to be purchased through the intimate persons in the professionl shop.
Sixthly, It appeared which the difference of satisfaction after the purchasing ( Behavior Stage after the purchasing ) has no significant difference between the groups.
As shown in the above-mentioned study results, there is the distinguished life style type between the professional soldiers, and they show some characteristic behavior upon its type.
In the purchasing motive, the traffic inconvenience release and trip/leisure desire satisfaction are strong and they make the importance on the performance and the maintaining charge in the purchasing.
Also, most professional soldiers place the importance to the practical scope.
And, as the advertising effect and the purchasing method, they showed the characteristics to purchase the car through the professional shop or the second-hand car market together with the person who is familiar by the effect of personal element as like the oral way rather than the advertising effect of mass media as like internet, TV and newspaper which are popular.
The results of this study will have its meaning to be useful to the setting-up of marketing strategy of enterprise or military welfare policy , subdividing the car purchasing market and supplying the effective standard to the finding of consumers of target market.목차
Abstract = i
제1장 서론 = 1
제1절 연구의 배경 = 1
제2절 연구목적 = 2
제3절 연구의 방법 및 구성 = 2
제2장 라이프스타일과 구매행동에 관한 이론적 고찰 = 4
제1절 라이프스타일의 이론적 고찰 = 4
1. 라이프스타일의 개념 = 4
2. 라이프 스타일의 결정요인 = 7
3. 라이프 스타일의 분석방법 = 10
4. 라이프스타일 분석을 통한 마케팅 전략 = 17
제2절 구매행동에 관한 이론적 고찰 = 23
1. 소비자 행동의 개념 = 23
2. 관여의 수준과 의사결정수준에 따른 구매유형 = 24
3. 구매행동에 영향을 미치는 요인 = 27
4. 구매의사결정 과정 = 31
제3절 승용차 구매행동에 관한 기존의 연구 고찰 = 40
1. 연구자별 선행 연구결과 고찰 = 40
2. 변수별 선？扇П？ 고찰 = 45
제3장 연구설계와 가설설정 = 49
제1절 연구모형과 가설설정 = 49
1. 연구모형 = 49
2. 가설의 설정 = 50
제2절 변수의 조작적 정의 = 52
1. 라이프스타일에 관한 항목 = 53
2. 구매의사결정단계에 관한 항목 = 54
3. 인구통계적 항목 = 55
제4장 실증분석 = 57
제1절 자료의 분석 = 57
1. 표본의 선정과 조사방법 = 57
2. 표본의 특성 = 57
3. 측정변수의 신뢰성 검정 = 58
제2절 연구가설의 검정 = 59
1. 라이프스타일에 관한 가설검정 = 59
2. 구매의사결정과정에 관한 가설검정 = 66
3. 분석결과의 요약 = 70
제3절 분석결과의 마케팅적 시사점 = 71
1. 시장세분화 시사점 = 71
2. 제품포지셔닝 시사점 = 72
3. 촉진전략 시사점 = 73
제5장 결론 = 74
제1절 연구의 요약 및 시사점 = 74
제2절 연구의 한계점 = 75
참고문헌 = 77
부록 = 8
Performance Improvement of a Fuzzy PID Controller and Its Application to the Position Control of Nonlinear Hydraulic Cylinders
Full text linkIn order to derive a new fuzzy controller, a fixed design-parameter fuzzy PID controller was surveyed in view of deriving a control law based on the design procedure of general fuzzy logic controllers. The controller is known to be very useful to control unknown nonlinear systems because it has nonlinear time-varying PID controller gains. While it has advantages that the resultant form of the controller is an analytical mathematical form and fuzzy rules are so simple, it also has a disadvantage that the PID control action is not applied at all or cannot be accurately applied when operating inputs are greater than or smaller than the reference input used to decide design-parameters in initial controller design procedure.
In this paper, in order to improve the disadvantage of the fixed design-parameter fuzzy PID controller, a new fuzzy PID controller named a variable design-parameter fuzzy PID controller was suggested. The main characteristic of the controller is to adjust design-parameters of the controller by comparing magnitudes between fuzzy controller inputs at each sampling time when controller inputs are measured. As a result, all fuzzy input partitions converge within a time-varying normalization parameter and the resultant PID control action can always be applied precisely regardless of operating input magnitudes.
In order to verify the effectiveness of the suggested controller, several computer simulations were executed for example mathematical systems such as a linear system and a nonlinear system. And another simulations were executed for a hydraulic position control system which is one of the typical nonlinear systems in the real field. The output of the suggested control system was compared with the outputs of linear PID and the fixed design-parameter fuzzy PID control system for several reference inputs.
In the conclusion, the variable design-parameter fuzzy PID controller was assured to be a very effective and useful method to control unknown nonlinear systems from the simulation results.목차
Abstract
제 1 장 서론 = 1
제 2 장 고정 설계파라미터 비선형 퍼지 PID 제어기 = 3
2..1 개요 = 3
2.2 고정 설계파라미터 비선형 퍼지 PID 제어기의 구성 = 4
2.2.1 제어기의 기본구조 = 4
2.2.2 퍼지화 알고리즘 = 6
2.2.3 피지 제어규칙 = 8
2.2.4 비퍼지화 알고리즘 = 11
2.2.5 제어기의 특징 및 설계절차 = 14
제 3 장 가변 설계파라미터 비선형 퍼지 PID 제어기의 제안 = 18
3.1 고정 설계파라미터 퍼지 PID 제어기의 단점 = 19
3.1.1 작동범위에 따른 퍼지 PID 제어동작의 효능저하 = 19
3.1.2 설계시 퍼지 P, I, D 제어동작 사이의 불균형성 = 19
3.1.3 고정 설계파라미터 비선형 퍼지 PID 제어기의 성능개선 방법 = 20
3.2 가변 설계파라미터 비선형 퍼지 PID 제어기 = 22
3.2.1 작동범위에 무관한 퍼지 PID 제어동작의 적용성 입증 = 22
3.2.2 가변 설계파라미터 비선형 퍼지 PID 제어기의 구조 및 설계절차 = 24
제 4 장 컴퓨터 시뮬레이션 및 결과 고찰 = 29
4.1 선형 시스템에 대한 적용 = 29
4.2 비선형 시스템에 대한 적용 = 34
제 5 장 비선형 유압시스템의 위치제어 문제에 적용 = 40
5.1 개요 = 40
5.2 유압시스템의 구성 = 41
5.3 유압시스템의 비선형 수학모델 = 43
5.3.1 전자비례제어밸브 = 44
5.3.2 편로드 실린더 = 44
5.3.3 부하구동부 = 52
5.3.4 밸브-실린더-부하시스템의 동적 방정식 = 53
5.4 시뮬레이션 및 결과 고찰 = 55
제 6 장 결론 = 62
참고 문
Structure Analysis of Ship's Collision Causes Using Fuzzy Structural Modeling
Full text linkThe prevention of marine accidents has been a major topic in marine society for long time and various safety policies and measures have been developed and applied to prevent those accidents. In spite of these efforts, however significant marine accidents have taken place intermittently.
During the course, hardware factors such as technology of ship building have been progressed significantly but software factors such as ship management including ship's crew have not. Ship is being operated under a highly dynamic environment and many factors are related with ship's collision and those factors are interacting. So the analysis on ship's collision causes are very important to prepare measures which will ensure the safety.
This study analysed, the cause of marine accidents using the marine accidents data over the past 10 years(1991-2000), which is compiled by Korea Marine Accidents Inquiry Agency. The analysis confirmed that 'ship's collision' is occurred most frequently and the cause is closely related with human factor.
The main purpose of this study is to analyse human factor. The structure of human factor is analysed by the questionnaire methodology. Marine experts were surveyed based on major elements that were extracted from the human factor affecting to ship's collision. Then, the structure analysis of ship's collision cause using Fuzzy Structural Modeling is performed. FSM(Fuzzy Structural Modeling) has been widely adopted in modeling a dynamic system which is composed of human factors.
The analysis shows that, the most important human factor related to the ship's collision is 'lookout negligence'. The other but less important factors are 'violation of navigation rules', 'inappropriate ship's speed', 'non-display of the navigation lights and shapes', 'non-execution of signals', 'sleepiness', 'inappropriate supervision' and 'inappropriate report and take over for duty officer's watch keeping', respectively.
This structure model could be used in understanding and verifying the procedure of real ship's collision. Furthermore it could be used as the model to prevent ship's collision and reduce marine accidents.목차
List of Tables = iv
List of Figures = vi
Abstract = vii
제1장 서론 = 1
1.1 연구배경 = 1
1.2 연구목적 = 7
1.3 논문구성 = 8
제2장 선박운항 위험성 = 9
2.1 선박운항시스템 = 9
2.2 운항위험성 = 13
2.2.1 위험성 평가 = 13
2.2.2 위험성 관리 = 15
2.2.3 의사소통과 위험성 수준 = 16
2.2.4 위험성기반 의사결정 = 19
제3장 국내 선박충돌사고 위험성 분석 = 21
3.1 해양사고 현황 = 22
3.2 해양사고 현황분석 = 26
3.2.1 발생빈도 분석 = 26
3.2.2 피해상황 분석 = 28
3.3 선박충돌사고 위험성 분석 = 36
3.3.1 선박충돌사고 빈도 분석 = 36
3.3.2 위해요소 파악 = 37
3.3.3 위험성 분석 = 43
3.3.4 분석결과 = 47
제4장 FSM기법 = 49
4.1 이론적 배경 = 49
4.2 FSM을 위한 수학적 준비 = 52
4.3 FSM기법 알고리듬 = 55
제5장 선박충돌사고 원인 구조분석 = 60
5.1 FSM기법에 의한 인적요소 구조분석 = 60
5.1.1 인적요소 자료분석 = 60
5.1.2 인적요소 구조 모델링 = 64
5.1.3 구조 그래프화 = 65
5.2 분석결과 검토 및 고찰 = 86
5.2.1 분석결과 타당성 검토 = 86
5.2.2 분석결과 고찰 = 86
제6장 결론 = 93
참고문헌 = 98
부록 1 = 102
부록 2 = 10
(A) Study on Analysis of port competition by using Inverse Relation of Fuzzy Evaluation
Full text linkRecently, Fuzzy theory has been applied in evaluation problem. Fuzzy evaluation based on Fuzzy theory can accommodate fuzziness of judgement with people through introducing Fuzzy measure. Representative Fuzzy evaluation is Fuzzy Integral using Fuzzy measure.
A definite methodology using Fuzzy Integral HFI (Hierarchical Fuzzy Integrals), HFEA (Hierarchical Fuzzy Evaluation Algorithm),
HFP (Hierar chical Fuzzy Process), etc.
In this paper, we deal with problem identifying evaluation value using Fuzzy Relation Equation at these Fuzzy evaluation. We verify relation between Input data and Output data through @-operation and apply this to HFP. And that we verify evaluation value which objects of evaluation are able to possess.1. 서론 = 1
1.1 연구의 배경 및 목적 = 1
2. 퍼지 평가법 = 3
2.1 퍼지 평가법 = 3
2.1.1 γ-퍼지측도 (γ-Fuzzy Measure) = 4
2.1.2 퍼지적분 (Fuzzy Integral) = 8
2.1.3 HFP의 평가 알고리즘 = 10
2.2 퍼지 관계 = 14
2.2.1 퍼지 관계의 합성 = 14
2.2.2 퍼지 관계 방정식의 해법 = 15
3. 적용 = 19
3.1 기존 연구사례 = 19
3.1.1 평가속성의 평가치 = 19
3.1.1.1 입지 = 19
3.1.1.2 시설 = 20
3.1.1.3 물류비용 = 21
3.1.1.4 물류서비스 = 21
3.1.1.5 관리운영 형태 = 23
3.1.2 평가 속성의 퍼지 측도치 = 24
3.1.3 퍼지평가 = 25
3.1.4 평가에 따른 분석 = 27
3.2 퍼지관계방정식에 의한 경쟁요인 도출 = 31
3.2.1 퍼지관계방정식에 의한 평가치 동정 = 31
3.2.2 경쟁여건의 변화에 의한 재평가 = 33
4. 결론 = 38
참고문헌 = 4
(A) Study on Course Stability of Towing and Towed Vessels System under Wind Pressure
Full text linkA Study on Course Stability of Towing and Towed Vessels System under Wind Pressure
The author discusses the problem on course stability of towed ship under severe wind pressure. The characteristic equation to assess the stability on course, is derived from sway and yaw coupled motions of towing and towed vessels with wind effect. Through the numerical calculation on course stability of towing and towed vessels system, the relationship between the course stability of a towed ship and wind direction or towrope length, is clarified with the parameter of wind speed in terms of Beaufort number. Two types of towed vessel, such as a bulk carrier and a passenger liner, are applied and examined. The major results are as follows. The course stability of towed vessel under wind pressure depends on the inherent course stability of the vessel herself. The towed vessel will be much unstable for the range from beam to quarter wind in relatively high wind speed. The length of towrope has also great infulence upon the stability. Long towrope will be able to stabilize for all range of wind direction in relatively low wind speed or for the head wind in relatively high wind speed
A Study on the Sensor-Embedded Hydraulic Cylinder for Offshore Application and Position Tuning Control of Multiple Cylinders
Full text linkIn this paper, an idea to comprise a sensor-embedded hydraulic cylinder for offshore applications was suggested. The idea not only includes a scale processing method of piston rod using ceramic plasma coating by Ti-ceramic and Al-ceramic, but also includes a remote detecting method using two sets of optical sensors and optical fibers. And it includes exclusive developing methods of circuit elements for the embedded sensor amplifier. Based on the methods mentioned above, a practical sensor-embedded hydraulic cylinder was developed and several experiments were executed in order to verifying the effectiveness of the suggested method.
There are two main advantages of the developed sensor-embedded hydraulic cylinder. One is that the embedded sensor can detect the piston rod strokes without time delay because light is used as a detecting medium, and it can be adapted to detect instantaneous high speed strokes of piston rod owing to the surge pressure of hydraulic oil. The other advantage is that the embedded sensor is robust against vibrations and shocks during operations, by installing only optical fiber head on the cylinder.
In this paper, a position tuning control method was also discussed, in order to control the positions of multiple cylinders for high power and high precision hydraulic control systems. The discussed method is to comprise a tuning controller based on CPU in view of digital hardware and software. To verify the effectiveness of the discussed method, computer simulations were executed by using two different mathematical models as hydraulic cylinder models. According to the simulation results, the discussed tuning control method was turned out to generate differential tuning control signals accurately. It is expected that the discussed method will be used more effectively than the conventional mechanical tuning control methods in view of accuracy and price burden.
A further study will be concentrated on experiments to analyze the control performance quantitatively for a practical system which is combined the suggested sensor-embedded hydraulic cylinders with the discussed position tuning controller.목차
Abstract
제 1 장 서론 = 1
제 2 장 해수용 센서내장형 유압실린더 = 3
2.1 해수용 센서내장형 유압실린더 개발의 필요성 = 3
2.2 해수용 센서내장형 유압실린더의 구성 = 4
2.2.1 센서내장형 유압실린더의 구성요소 = 4
2.2.2 내장형 센서를 이용한 스트로크 검출 원리 = 6
2.3 내장형 센서를 위한 해수용 피스톤 로드의 처리 = 7
2.4 양방향 스트로크 검출을 위한 광파이버헤드의 설치방법 = 9
제 3 장 내장형 센서 전용앰프의 설계와 각 요소의 기능 = 11
3.1 내장형 센서앰프의 전체구성 = 11
3.2 내장형 센서앰프 각 요소의 설계와 기능 = 12
3.2.1 발/수광 센서 전용의 아날로그 회로 = 12
3.2.2 출력 안？ㅐ？ 위한 자동 게인 조정회로 = 14
3.2.3 트리거 및 외부감도조정 회로 = 15
3.2.4 업/다운 카운터 회로 = 16
3.3 80C196KC 중심의 데이터 처리 = 17
제 4 장 다중 실린더 위치동조 제어의 구현 = 21
4.1 위치동조 제어의 필요성 = 21
4.2 동조제어기의 구현 방법 = 22
4.3 동조제어기의 전체 구성 = 22
제 5 장 실험 및 시뮬레이션 = 24
5.1 내장형 센서앰프 동작 실험 = 24
5.1.1 증분방식 스트로크 측정의 가능성 = 24
5.1.2 양방향 스트로크 측정의 가능성 = 25
5.1.3 출력위상 안정을 위한 자동 게인 조정 가능성 = 26
5.1.4 외부 트리거 레벨조정과 감도조정의 가능성 = 27
5.2 해수용 센서 내장형 실린더의 스트로크 검출 실험 = 29
5.2.1 스트로크 검출의 선형성 및 정확도 실험 = 29
5.2.2 스트로크 검출의 반복 정밀도 실험 = 30
5.3 두개의 유압실린더 위치동조 제어를 위한 시뮬레이션 = 32
5.3.1 2개의 유압실린더 수학모델 = 32
5.3.2 퍼지 PID제어기의 구조 및 응답특성 = 34
5.3.3 위치동조 제어기의 구현 = 39
5.3.4 시뮬레이션 결과 = 40
제 6 장 결론 = 48
참고 문헌 = 4
Analysis of Ocean Discharges of Municipal Water and its Near-Field Mixing Characteristics
Full text linkAnalysis of Ocean Discharges of Municipal Water and its Near-Field Mixing Characteristics
Due to the growth of population and industrial development at the coastal cities, there have been much increase in necessity to effective disposal of the wastewater. The amount of municipal water has been increased rapidly and it is necessary to treat and dispose the wastewater effectively. The recent trend, in terms of disposal of it, is discharge through diffusers into the ocean, either at the coastline or at the deep water, or between these two.
For this end, we need to predict near-field characteristics of discharged water. We adopted CORMIX model for the analysis of the near-field behavior of discharged water and made certain comparison with the existing experimental results.
We found the early dilution is important, especially for the numerical simulation by a depth averaged hydrodynamic model of diffusion mechanism at the existing flow field.
We also applied it to the Pusan Jungang Effluent Outfall System, which is planned to be in the Gamchun harbour and will be completed in 2011. The model output showed the trajectoral variation of dilution and mixing behavior for three cases of outfall system. Dilution differences have been simulated and found the highest dilution condition under the different displacement of outfall system. On the basis of these outputs it will be proposed the optimum outfall system type and location.
Through the case study, dilution is dependent on the discharge depth, the ambient velocity and total flow rate. This approach might contribute to deal with serious water quality problems caused by the ocean discharge