8090 research outputs found
Sort by
Design and Implemenation of LonWorks Communication Module for Microcontroller Control
Full text linkIn this paper, we implemented universal controller for distributed intelligent control system using LonWorks technology of Echelon co. and developed LON system.
LON is a important element in low-level control network that issues in the automatic as well as in economic aspect.
It can change large control system to small by using distributed control technique with intelligent device. Developed system is based on network communication technique using LonWorks technology.
LonWorks communication module has the advantage that field bus is connected without protocol modification.
LonWorks communication module can be divided hardware module and software module. First, hardware module is divided into microcontroller attaching sensors and hardware communication module for working together control network and data network. Second, software module is realized with neuron C.
Hardware module is making use of neuron chip(TMPN3120FE3M), microcontroller(PIC16F873), transceiver(FTT-10A), Lon card(PCLTA- 20 PCI LonTalk adapter). And operating software is realized with neuron C using NodeBulider 3.0 development tool.
Produced and implemented LonWorks communication module is pretested using LTM-10A, Gizmo 4 I/O board, parallel I/O Interface. For field test, microcontroller module part is tested by hyper-terminal, communication procedure in data network is certified by transmitting and receiving short message using LonMaker for Windows tool.
This thesis is composed of five chapters. Chapter 1 describes the historical background, goals of LonWorks and outline of remaining chapters. Chapter 2 describes the concepts of LonWorks. Chapter 3 describes design and implementation of LonWorks communication module for microcontroller control. Chapter 4 describes the experimental result of LonWorks communication module and consideration to the result. Chapter 5 summarizes all results obtained in this thesis and includes the further reseach topics and the work to be supplemented.목차
Abstract
제1장 서론 = 1
1.1 연구의 배경 및 목적 = 1
1.2 연구의 내용 = 2
제2장 LonWorks의 개념 = 4
2.1 LonWorks 시스템의 개요 = 4
2.2 LonWorks 시스템의 구성요소 = 6
제3장 LonWorks 통신 모듈의 설계 및 구현 = 20
3.1 표준형 론 노드(SLN) = 20
3.2 LonWorks 통신 모듈 제작의 구성요소 = 21
3.3 LonWorks 통신 모듈의 구성 = 23
3.4 LonWorks 통신 모듈의 제작 = 26
3.5 LonWorks 통신 모듈의 펌웨어 구현 = 31
제4장 구현 결과 및 고찰 = 42
4.1 구현 결과 = 42
4.2 실험 환경 = 43
4.3 실험결과 = 44
？？5장 결론 = 48
참고문헌 = 5
A Study on the Problems and Effects of U.S.A Shipping Policy Related Acts
Full text linkThis paper is regarding the Problems and Effects of U.S.A Shipping Policy Related Acts against worldwide shipping market. We have a longtime good relationship with U.S.A in various fields as well as shipping parts. And U.S.A shipping acts have impacted on worldwide shipping including Korea's.
This subject focus on attaining five purposes 1) The history of U.S.A Shipping Acts. 2) Shipping Act of 1984. 3) The U.S Ocean Shipping Reform Act of 1998. 4) The Problems and Effects of U.S.A Shipping Policy Related Acts. 5) The Korea shipping countermeasure against U.S.A Shipping Act.
This study consists of six chapters. The first chapter reads a general introduction of this subject. The second chapter, the review of the history of U.S.A shipping acts as in age order with Shipping Acts and Merchant Marine Acts respectively.
The third chapter lay out the descriptions of Shipping Act of 1984, and the effects on the world shipping market. And then, the fourth chapter concentrate on the U.S Ocean Shipping Reform Act of 1998, from that it was passed by Congress and signed into law in October 1998. its provisions take effect May 1, 1999. The fifth chapter critically reviews in current U.S.A shipping act's injustice aspects. and propose the countermeasure to cope with current U.S.A shipping act. finally, the last chapter offers a conclusion to this paper.
The America shipping policy is consisted in Shipping act and Merchant Marine Act which are two public law scheme. However, they don't distinguish them each other. Shipping act is for externally enacting America shipping policy specially against shipping conference and worldwide shipping market. Merchant Marine Act interiorly purposed the America shipping industry promotion.
The shipping act of 1916 was the first United States legislation which was used to regulate the practices of steamship liners serving within the United States.
And then, it was adjusted into shipping act of 1961, newly the shipping act of 1984 was legislated to establish a nondiscriminatory regulatory process for the common carriage of goods by water in the foreign commerce of the United States with a minimum of government intervention and regulatory costs, and to provide an efficient and transportation system in the ocean commerce of the United States that is, insofar as possible, in harmony with, and responsive to, international shipping practices, and to encourage the development of an economically sound and efficient United States-flag liner fleet capable of meeting national security needs.
Also it was reformed into 'the Ocean Shipping Reform Act of 1998', and the purpose was added 'To promote the growth and development of United States exports through competitive and efficient ocean transportation and by placing a greater reliance on the marketplace.'
Currently, the Ocean Shipping Reform Act of 1998 modifying the shipping Act of 1984 is coming into effect in worldwide shipping market.
It has many injustice aspects as follows.
1) It's excessive a protective policy to the United States shipping liners. Therefore, FMC restricts the worldwide shipping market and oversea shipping liners.
2) The shipping liners should concentrate on U.S.A shipping acts in order to avoid violation.
3) Conference lost freight and market adjustment ability with the effectuation of shipping act of 1984 and OSRA, Therefore, if the market slow down, they may be liable to cause property damage.
4) The medium and small size shippers have a tough in the recent shipping market with the effectuation of shipping act of 1984 and OSRA
5) NVOCC will not be allowed to offer service contracts. Consequently, they are less competitive than common carriers.
The Korea liner companies have to overcome U.S.A shipping acts in this situation as following strategies. Firstly, they must meet the needs of the times on computerization age in global network fields. And then, shippers have to try to get more information on freight, liner service and so on. Also, they must organize shipper's association in order to contract more competitive freight and service condition with Liner.목차
第1障 序論 = 6
第1節 硏究의 目的 = 6
第2節 硏究의 方法 및 範圍 = 7
第2障 海運政策 關聯法의 沿革 = 10
第1節 海運政策의 方向 = 10
第2節 1916年 以前의 海運政策 關聯法 = 13
第3節 海運法 = 16
1. 1916년 해운법(Shipping Act of 1916) = 16
2. 1961년 해운법(Shipping Act of 1961) = 18
3. 1978년 해운법(Ocean Shipping Act of 1978) = 20
4. 1984년 해운법(Shipping Act of 1984) = 21
5. 1998년 미국외항해운개혁법(U.S Ocean Shipping Reform Act of 1998) = 21
第4節. 商船法 = 22
1. 1920년 상선법(Merchant Marine Act of 1920) = 22
2. 1936년 상선법(Merchant Marine Act of 1936) = 23
3. 1946년 상선법(The Merchant Ship Sales Act of 1946) = 24
4. 1970년 상선법(Merchant Marine Act of 1970) = 25
第3障 1984年 海運法의 內容과 影響 = 27
第1節. 立法 背景 = 27
第2節 主要 內容 = 28
1. 84년 해운법의 제정목적 = 28
2. 獨占禁止法 適用免除 = 28
3. 獨自行動權(Independent Action : I/A)의 도입 = 30
4. 貨物優待運賃(Time/Volume Rate : TVR)의 도입 = 31
5. 優待運送契約(Service Contract : S/C)의 도입 = 32
6. 二重運賃契約制의 실질적 금지 = 33
7. 미국선사의 보호 = 34
8. 국영선사의 통제 = 34
9. 荷主團體(SA)의 인정 = 35
10. 無船舶運送人(NVOCC)의 법적 지위 인정 = 36
11. 해운동맹자문위원 = 36
第3節. 外航定期船 海運市場에 미치는 影響 = 37
1. 해운동맹에 미친 영향 = 37
2. 선박대형화의 촉진 = 40
3. 하주에 미친 영향 = 41
4. 복합운송에 미친 영향 = 42
第4障 1998年 外航海運改革法의 內容과 影響 = 43
第1節. 制定 背景과 特徵 = 43
第2節 內容 = 45
1. 法의 執行機關 = 45
2. 태리프(Tariff) 申告 및 免除品目 = 46
3. 테리프(Tariff) 申告機關 및 申告方法 = 47
4. 置運賃還割引 및 二重運賃契約制 = 48
5. 荷主差別待遇 = 48
6. 優待運送契約 (Service Contract) = 49
7. 내륙운송비협상 = 51
8. 운임동맹의 태리프(Tariff) 및 優待運送契約(S/C)에 관한 獨自行動權(I/A) = 51
9. 미국선사보호 = 52
10. 海上貨物 및 運送周旋人, 無船舶運送人(NOVCC) = 52
11. 기타 변경 사항 = 54
第4節. 外航定期船 海運市場에 미치는 影響 = 55
1. 해운규제의 완화 = 55
2. 하주의 교섭력 증대 = 56
3. 해운동맹의 붕괴 및 신협조체제 등장 = 57
4. GLOBAL 제휴의 확산 및 합병시대의 도래 = 57
5. GLOBAL SERVICE 계약 시대의 도래 = 59
第5障 海運政策 關聯法의 問題點과 對應方案 = 60
第1節 海運企業의 觀點 = 60
1. 선사 측면에서의 문제점 = 60
2. 운임동맹 측면에서의 문제점 = 64
3. 미국내 하역,내륙운송업체, 해상터미널운영업자 측면에서의 문제점 = 68
4. 해운기업의 관점에서 대응 방안 = 71
第2節 荷主의 觀點 = 73
1. 하주 측면에서의 문제점 = 73
2. 하주의 관점에서 대응 방안 = 74
第3節 複合運送의 觀點 = 76
1. 복합운송측면에서의 문제점 = 76
2. 복합운송의 관점에서 대응 방안 = 81
第4節 制度的 觀點 = 83
1. 84년 해운법 및 98년 외항해운개혁법의 보호주의적 성향 = 83
2. 연방해사 위원회(FMC)의 기능적 측면에서의 문제점 = 85
3. 정기선동맹협약(UNCTAD LINER CODE)측면에서의 문제점 = 89
3. 제도적 관점에서 대응 방안 = 92
第5節 立法的 改善 方向 = 93
第6障 結論 = 9
Marketing Strategies for Busan Container Terminals
Full text linkAs the circumstances surrounding world ports have changed rapidly, port competition to attract more cargoes is increasing fiercely. The emergence of global liner shipping companies has also meant that fewer ports of call are desired for the largest container vessels, meaning that ports have to try harder to compete for business against fewer customer in an augmented market place.
Fierce competition to attract the increasing container cargoes of the North China and the West Japan in North-East Asian region has caused main container ports of Korea, Japan, and China not only to invest enormous fund to modernize their port facilities but also to improve efficiency in port operation and management.
In this situation, port marketing is of immediate necessity in Korean container port in order to enhance port competitiveness in the North-East Asian region.
Nevertheless, the studies on port marketing have not been conducted enough and the existing studies related have had the limitation not doing empirical analysis but tried to a theoretical approach.
This study, therefore, aims to establish the feasible marketing strategies to attract (transshipment) container cargoes in the North-East Asian region by empirical analysis .
To tackle this goal, first of all, this paper reviews a theoretical background and the existing literatures on port marketing. it, then, proposes marketing situation of Busan container terminals and the marketing benchmarking of advanced container ports in the world. Finally, it presents marketing mix strategy, customer discrimination strategy, competition strategy among their ports in North-East Asian region, and marketing strategy to attract transshipment cargoes.
The major output of the research is as follows:
First, Busan container Terminals are required to focus on Product(Facilities and Service)mix and PlaceㆍPromotion mix of the Marketing Mix and the most important marketing strategies to attract transshipment cargoes among its ports in North-East Asian region are to adjust port tariff and free storage period with flexibility.
Second, customer positioning strategy shows that Busan port to attract transshipment cargoes is required to adjust free storage period with flexibility for liner shipping companies using Gwangyang and HongKong ports, need to operate port tariff with flexibility for Freight Forwarder using Busan port mainly, and need to promote superiority of location for liner shipping companies using Busan port mainly.
Third, Price-Demand function of Busan port between main competitive ports in North-East Asian region that is derived from marketing strategies to attract transshipment cargoes, helps marketing manager to fix scientifically port price as understanding the change of demand quantity.목차
Abstract
제1장 서론
1.1 연구의 ？瘟？ 및 목적 = 9
1.2 연구방법 및 구성 = 10
제2장 항만마케팅의 이론적 고찰
2.1 항만 마케팅의 정의 및 변화 = 13
2.1.1 항만 마케팅의 정의 = 13
2.1.2 항만의 발전에 따른 마케팅의 변화 = 13
2.2 항만 마케팅의 목표와 과제 = 16
2.2.1 항만 마케팅의 목표 = 16
2.2.2 항만 마케팅의 과제 = 16
2.3 항만 서비스의 특성 = 17
2.4 항만마케팅 전략 구성 = 18
2.4.1 항만 마케팅 믹스 = 18
2.4.2 고객세분화 및 포지셔닝 = 25
2.5 선행 연구 검토 = 29
2.5.1 항만경쟁력 평가에 관련된 연구 = 29
2.5.2 환적화물 유치전략과 관련된 연구 = 32
2.5.3 선행연구의 한계 및 연구방향 = 33
제3장 부산 컨테이너항만의 주체별 마케팅 현황 및 선진외국항만 마케팅 벤치마킹
3.1. 컨테이너항만의 마케팅 전략의 필요성 = 34
3.1.1 해운ㆍ항만 환경 현황 분석 = 35
3.1.2 국내 컨테이너 전용터미널의 운영여건 변화 = 41
3.2 부산 컨테이너항만의 주체별 마케팅 믹스 현황 = 45
3.2.1 각 주체별 활동 현황 = 45
3.2.2. 주체별 마케팅 역할 정립 = 46
3.3 선진외국항만 마케팅 벤치마킹 = 48
3.3.1 벤치마킹의 정의 및 대상 = 48
3.3.2 벤치마킹 조사시기 및 방법 = 48
3.3.3 벤치마킹 결과 = 48
제4장 부산항 마케팅 전략 수립을 위한 실증 분석
4.1 연구 디자인 = 54
4.1.1 항만마케팅 변수선정 및 연구모델 = 54
4.1.2 설문개요 = 57
4.1.3 조사대상과 방법 = 57
4.1.4 설문지 내용과 구성 = 58
4.1.5 표본과 조사응답자의 특성 = 58
4.1.6 분석 내용 및 방법 = 60
4.2 항만선호도 및 항만마케팅 믹스 분석 = 60
4.2.1 항만선호도 분석 = 61
4.2.2 항만마케팅 믹스 분석 = 63
4.3 환적 컨테이너화물 마케팅 분석 = 74
4.3.1 마케팅 요인 분석 = 74
4.3.2 환적 컨테이너 화물 시장점유율 분석 = 92
4.3.3 환적 컨테이너 화물 가격-수요함수 도출 = 94
제5장 부산항의 주체별 마케팅 전략 방안
5.1 부산항 주체별 마케팅 믹스 전략 = 98
5.1.1 제품전략 = 98
5.1.2 가격전략 = 100
5.1.3 경로ㆍ촉진 전략 = 102
5.2 경쟁항만별 경쟁우위전략 = 103
5.3 부산항의 환적화물 유치를 위한 마케팅 전략 = 104
제6장 결론 및 향후연구방향
6.1 결론 = 106
6.2 연구의 한계 및 미래연구방향 = 107
참고문헌 = 10
(A) STUDY ON THE IMPLEMENTATION OF DUE DILIGENCE AND ITS EFFECT : FOCUSSING ON THE MARINE HULL INSURANCE
Full text linkA Study on the Implementation of Due Diligence and Its effect
- Focussing on the Marine Hull Insurance -
Marine Insurance is for the underwriter to indemnify the assured, in manner and to the extent there by agreed, against marine losses, that is to say, the losses incident to marine adventure. In marine hull insurance, a loss or damage to the assured's insured-against can be divided into two categories. The one is the losses which always can be covered from underwriters regardless of assured's due diligence to his insured-against such as the losses proximately caused by perils of the seas and Act of God, and the other is the losses which can be covered only if his due diligence have been proved.
Accordingly, there may be some cases in which underwriters refuse to pay claims to the assured in case of his want of due diligence and actually, a lot of cases which an assured could not have been covered, existed through the history of marine hull insurance claims. Marine enterprisers such as ship's owners, managers, charterers and carriers should not overlook this kind of resonable care in running their business, and if they fail to do so, they might be in trouble with legal liability, to say nothing of their financial hardness and difficulty in management.
Statistically, looking back the past marine accident cases in korea, the most parts of the accident are man-made disasters caused by want of due diligence. So, this study will focuss on this kind of marine losses and insurance clauses and other relevant rules containing due diligence such as due diligence of the assured in inchmaree clause, ITC-Hulls, 1983, and due diligence of carrier in Hague-Visby Rule and so on. This study also shows what the disadvantages to marine enterprisers are, caused by want of due diligence and the advantages of doing due diligence are.
In conclusion, this study contends that marine enterprisers should perform due diligence in doing their business for both financial stability and good management of their companies.
s
A Study on the Effects of ISO 9 Series on Service Quality Management for Ship Repair Companies
Full text linkEver since the introduction of ISO 9000 Certification System in 1987, many companies have adapted Quality Management System to their operation. A lot of ship repair companies have acquired ISO 9000 certifications in recent years. But there has been little study on whether companies that accepted Quality Management System had good results. Therefore, this study is to grasp the actual situation of companies operating via Quality Management System, by comparing ship repair companies' management systems before and after the acquisition of ISO 9000 Certifications. And in case anything amiss found from Systems, this is to suggest methods to improve the Quality Management System by researching causes of them. To accomplish the object of this study, literature study and field investigation were done simultaneously. For the literature study, searched literature about the service quality, especially service quality of ship repair business and specially studied ISO 9001:2000, lately revised edition. For the field investigation, mainly inquired of ship repair companies, shipping companies and auditors in ISO 9000 certificating body about the effectiveness of Quality Management System they adopted, and analyzed causes of things amiss through questionnaire sheets. As a result of analysis, ship repair companies acquired ISO 9000 certifications for the improvement of service quality, sales and work standardization.
With the acquisition of ISO 9000 certifications, they achieved their goals in some sort in service quality improvement and work standardization, but not in sales as they expected.
Also it showed that ship repair companies and shipping companies consider the quality as the most important thing in ship repair services. In many cases quality management system documents of ship repair companies don't reflect the real aspects of the repair companies. But, those unsuitable Quality Management System documents are not revised, because people do not fully understand ISO 9000 System documents and are short of time to correct them. Shipping companies, the customers of ship repair companies, consider the service quality and price as the most important thing in choosing ship repair companies, not ISO 9000 certification acquisition. Shipping companies set a high value on companies that operate via Quality Management System, considering being better in service quality and more systematic than other companies.
As mentioned above, ship repair companies need to improve Quality Management System consistently for the purpose of quality improvement, productivity increase and customer's satisfaction. Government's authorities and local bodies relating to ISO 9000 Certification System should lead companies to acquire ISO 9000 certifications through positive campaign of publicity and active supports, and finally leading to the national competitiveness.목차
Abstract = I
제1장 서론 = 1
제1절 연구의 배경 및 목적 = 1
제2절 연구의 방법 및 구성 = 2
제2장 선박수리업체의 품질경영에 관한 이론적배경 = 4
제1절 품질에 대한 개념정립 = 4
제2절 서비스 품질의 개념 = 9
제3절 선박수리업체 서비스품질의 특성 = 12
제4절 ISO 9000에 대한 이론적 고찰 = 16
제5절 품질경영시스템의 성과측정 = 24
자료: Robert S. Kaplan & David P. Norton, ibid. pp.174-179. = 26
제3장 ISO 9000 도입에 대한 실태분석 = 29
제1절 설문조항의 구성 및 표집 현황 = 29
제2절 선박수리업체 대상 설문조사의 분석 = 31
제3절 해운회사에 대한 설문조사 분석 = 39
제4절 인증기관의 심사원 대상 설문조사 분석 = 43
제4장 실태분석에 따른 품질경영 개선방안 = 46
제1절 문서화 요구사항 = 46
제2절 경영책임 = 47
제3절 제품실현 = 52
제4절 측정, 분석 및 개선 = 58
제5장 결론 = 62
제1절 연구 결과의 요약 = 62
제2절 연구의 한계 및 향후 연구 방향 = 63
참고문헌 = 65
부록 1 선박수리업체 설문 = 68
부록 2 해운회사 설문 = 74
부록 3 심사원 설문 = 7
Design, Stabilization and Tracking Algorithms of Ship Board Satellite Antenna Systems
Full text linkThis thesis presents the development of stabilization and tracking algorithms for shipboard satellite antenna systems.
With increasing the demand for the distribution of information, the use of satellite communication having merits in breadth, efficiency and speedy of construction network, and the facility of a movement has been increasing. As the result, extensive research has been carried out on mobile terminals used in satellite communication stations .
In order to use satellite broadcasting and communication service on a navigating ship, the antenna should always point to the satellite. There are two types of stabilization control which maintains the point-angle of a satellite in spite of the changing position and movement of the ship. One is passive control which maintains a horizontality by the inertia of fly-wheel. The other is active control which compensates the movement of the ship directly by driving the actuator attached on the shaft of the antenna. Recently active control is mostly used due to the development of electronic devices and control schemes. This research is satellite tracking antenna system using active stabilizing method.
In this thesis, both a hardware system including the pedestal, pedestal control unit and antenna control unit and software for stabilization control are developed. In order to design a controller which stabilizes each control axis, a model is derived and its parameters are estimated using a genetic algorithm, and the state feedback controller is designed based on the linearized model.
Then a tracking algorithm is derived to overcome some drawbacks of the step tracking. The proposed algorithm searches for the best position using gradient-based formulae and signal intensities measured according to a search pattern. The effectiveness of both the stabilization and tracking algorithms is demonstrated through experiment using real-world data.목차
Abstract = i
그림목차 = vi
제 1 장 서론 = 1
1.1 연구의 배경 = 1
1.2 연구의 목적 및 방법 = 2
1.3 논문의 구성 및 내용 = 3
제 2 장 선박용 위성안테나 시스템의 설계 = 5
2.1 서언 = 5
2.2 선박용 위성안테나 = 7
2.2.1 좌표계 = 7
2.2.2 선박의 운동 = 8
2.2.3 선박용 위성안테나의 안정화 방식 = 9
2.3 전체 시스템？？ 구성 = 14
2.3.1 SAP(Stabilized antenna pedestal)의 구조 = 15
2.3.2 PCU(Pedestal control unit)의 구성 = 22
2.3.3 ACU(Antenna control unit)의 구성 = 24
2.4 자세 검출용 센서 및 신호처리 = 27
2.4.1 각속도 센서(Rate sensor) = 27
2.4.2 경사각 센서(Tilt sensor) = 30
2.4.3 저역 통과 필터 설계 = 32
2.4.4 A/D 변환부 설계 = 32
2.5 소프트웨어 구조 = 33
2.5.1 PCU의 소프트웨어 구조 = 33
2.5.2 ACU의 소프트웨어 구조 = 35
2.6 결언 = 37
제 3 장 안테나 시스템의 모델링 및 안정화 = 38
3.1 서언 = 38
3.2 최적화 도구로서의 유전 알고리즘 = 38
3.2.1 염색체 표현 = 40
3.2.2 초기집단의 생성 = 40
3.2.3 RCGA의 유전 연산자 = 41
3.2.4 엘리트 전략(Elitist strategy) = 45
3.3 시스템 모델링 = 47
3.3.1 RCGA를 이용한 파라미터 추정 = 49
3.3.2 추정 모델의 검증 실험 = 52
3.4 안정화 제어기 설계 = 54
3.4.1 상태 궤환 제어기 = 54
3.4.2 실험 및 검토 = 56
3.5 결언 = 66
제 4 장 추적 알고리즘 개발 = 67
4.1 서언 = 67
4.2 위성 신호의 세기 분포 = 68
4.3 서칭(Searching) = 69
4.4 추적(Tracking) = 71
4.4.1 기존의 추적 알고리즘 = 71
4.4.2 제안된 추적 알고리즘 = 73
4.4.3 실험 및 검토 = 76
4.5 결언 = 82
제 5 장 종합 실험 및 검토 = 83
5.1 서언 = 83
5.2 종합 실험 = 85
5.3 결언 = 91
제 6 장 결론 = 92
참고문헌 = 94
부록 = 10
센서를 활용한 이족보행로봇의 구동
Full text linkThis thesis obtains the information of the walking of the pattern developed biped robot in our laboratory, and shows autonomous walking of the robot sensors. For a walking motion of the biped walking robot, human's walking data are obtained by using the motion capture system to apply man's walking pattern and then robot's walking motion is analyzed with the obtained data by utilizing the computer simulation. It which was the control system for control experiment of the walking robot was made, and robot which has motion capture simulation data tests out robot's walking to remote control. These systems for walking simulation and autonomous walking utilize an ultrasonic sensor and a gyro sensor. The ultrasonic sensor perceives the distance of obstacles in real time is programmed to avoid obstacles. The gyro sensor the incline angle information of the walking robot to balance it's posture. Ultrasonic waves and the gyro sensor controller are developed for remote walking of the biped walking robot obtained data. Though this experiment of biped walking robot, that operates from the command. Those which were Data-Base of self-control walking, remote control and simulation were secured by this thesis.목차
Abstract
기호설명
그림목차
제1장 서론 = 1
제2장 이족보행로봇의 기구 메커니즘 = 3
2.1. 사절 링크와 볼나사 구동기 = 3
2.2. 발목관절 = 5
2.3. 무릎관절 = 7
2.4. 골반관절 = 8
제3장 이족보행로봇의 구동 = 11
3.1 모션 캡쳐 시스템의 종류 = 11
3.1.1. 기계적 방식 = 12
3.1.2. 광학식 = 12
3.1.3. 자기방식 = 13
3.2. 모션 캡쳐 시스템의 구성 및 시뮬레이션 = 13
3.3. 이족보행로봇의 시스템 구성 = 16
3.3.1. Mobile Computer = 19
3.3.2. 모터 구동 보드(MMC-PV8) = 21
3.3.3. 모터 인터페이스 = 23
제4장 이족보행로봇 센서 = 25
4.1. 구동용 센서 = 25
4.1.1. 초음파 센서 = 25
4.1.2. 자이로 센서 = 28
4.1.3. 포텐셔미터 = 31
4.2. 센서 신호 시스템 = 32
제5장 이족보행로봇의 보행을 위한 제어와 센서를 활용한 로봇의 구동실험 = 34
5.1. 실험 장치 구성 = 34
5.2. 실험 및 고찰 = 41
제6장 결론 = 47
참고문헌 = 4
A Study on the Design of Improving Gain Circuits for Dynamic Envelope Tracking Amplifier in Cellular Phone
Full text linkThe RF power amplifier is required to be linear to maintain signal integrity with limited spectral regrowth in the mobile radio transmitter with digital modulation format. To maintain the linearity of an RF amplifier, a Class-A or Class-AB mode amplifier is typically operated.
In many wireless systems, the power transmitted by the mobile unit is adjusted such that signals arriving at a base station from all portable transmitters are similar in power level. Because of having to accommodate the variable distance between mobile and base units, as well as multipath and shadow fading, the amplifiers operate over a wide dynamic power range extending from a maximum level to 10dB in power back-off.
Envelope tracking(ET) amplifier with variable bias voltage is a certain method for power amplifier application of the third generation cellular phones.
However, the input and output impedance of transistors vary with the changing of the Q-point and power level. Because of the variation of impedance, the gain and efficiency of ET amplifiers decreases a lot and the VSWR and stability become worse. The mismatching of dynamic ET amplifier can't be substantially avoided.
In this thesis, the mismatching of dynamic ET amplifiers is proven to be compensated using a varactor diode.
The gain is experimentally improved by 7㏈ above 15㏈m output power. The efficiency improve about 2.5 times. The DC power consumption ET amplifier of which the impedance is compensated is 37% of bias fixed power amplifierAbstract = ⅰ
Nomenclature = ⅱ
제 1 장 서론 = 1
제 2 장 전력 증폭기의 이론 = 4
2.1. 전력 증폭기의 특성 = 4
2.1.1. 비선형성(nonlinearity) = 4
2.1.2. 입력 신호 레벨에 따른 임피던스의 변화 = 7
2.2 고주파 전력 증폭소자의 특성 = 9
2.2.1.고주파 전력 소자의 직류 특성 = 9
2.2.2. 고주파 전력 소자의 교류 특성 = 10
2.2.3. 전력 증폭시스템 설계시 고려 사항 = 11
제 3 장 포락선 추적 증폭기 = 14
3.1 포락선 추적 증폭기의 원리 = 14
3.2 포락선 추적 증폭기의 특징 = 15
3.3 DC-DC converter의 원리 = 18
제 4 장 제안된 포락선 추적 증폭기 = 23
4.1 포락선 추적 증폭기의 임피던스 보정 = 23
4.2 임피던스 보정에 사용된 바렉터 다이오드의 특성 = 25
제 5 장 측정 및 결과 분석 = 28
5.1 바렉터 다이오드의 임피던스 측정 = 28
5.2 실험에 사용된 전력 증폭기의 특성 = 31
5.2.1 전력 증폭기의 특성 확인 실험 = 31
5.2.2 전력 증폭기의 입력 및 출력 임피던스 측정 = 36
5.3 결과 및 분석 = 38
제 6 장 결론 = 43
참고문헌 = 44
부록 = 4
A Study on the Pressure Drop of Air-Water Two-phase Flow in Small Diameter Vertical Tubes
Full text linkThe two-phase flow is encountered in nature and many industrial applications such as the evaporators and condensers of refrigeration and air-conditioning systems, the conventional steam power plants, the nuclear power plants, and the chemical processing systems.
Recently, on the increase of heat flux due to a high-integrated electric circuit using in the computer, it is impossible to cool the electric circuit by the forced convection cooling method with air. So the phase-change heat transfer has been proposed.
The phase-change heat transfer can be adopted to design the cooling of electric circuit, narrow-gap boiling in nuclear power plants and compact heat exchanger.
In this case, the tube size is less than 5.0 mm inner diameter but until now, the two-phase research have been performed in greater than 10.0 mm inner diameter.
If working fluid and the shape of tube change, the characteristics of the heat transfer and flow patterns will be changed and it can't be adopted to the small diameter tubes.
In the present study, single-phase and two-phase experiments were performed to develop the pressure drop correlation, the flow regime map, and flow characteristics in 2.0, 4.0, 6.0, 10.0 mm inner diameter under the assumption of phase-change heat transfer.
Working fluid were air and water.
Single-phase flow experiments were performed to check the conventional prediction method for single-phase flow and the reliability of the experimental apparatus before two-phase flow experiments.
The conventional method to predict the friction factor in single-phase turbulent flow is the Blausius equation.
In case of 6.0 and 10.0 mm inner diameter, the friction factor agreed very precisely with the Blausius equation but in case of 2.0 and 4.0 mm inner diameter, the friction factor not agreed and were lower than the Blausius eqution.
From the experimental results, the new friction factor equation at the Reynolds number greater than 2,000 in turbulent flow region were obtained.
The total two-phase flow pressure drop consists of three components such as a frictional, a gravitational, and an acceleration (or deceleration) component.
The frictional pressure drop of two-phase flow was calculated by subtracting gravitational pressure drop from the measured total pressure drop. The acceleration pressure drop was neglected because of no phase change, constant void fraction, quality and cross sectional area.
The void fraction was calculated and compared by homogeneous model, drift flux model, and Hibiki correlation as a function of inner diameter.
The frictional pressure drop of two-phase flow was calculated and compared by Chisholm parameter, Hibiki correlation and new fricton factor obtained from single-phase flow.
The mechanism of the pressure drop in small tubes was discussed and new prediction method was proposed.목차
Abstract = iv
사용기호 = vii
제1장 서론 = 1
제1절 이상유동의 개요 = 1
제2절 주요 변수의 정의 = 3
제3절 종래의 연구 = 8
3.1 수직유동 = 8
3.2 수평유동 = 14
3.3 미세관에서의 이상유동 특성 = 19
제4절 본 연구의 배경 및 목적 = 21
제2장 실험장치 및 실험방법 = 23
제1절 실험장치의 개요 = 23
1.1 공기 공급계통 = 24
1.2 물 공급계통 = 25
제2절 실험방법 및 실험범위 = 30
2.1 실험방법 = 30
2.2 실험범위 = 31
제3절 데이터 정리 = 34
3.1 단상유동에서의 압력강하 = 34
3.2 이상유동에서의 1차원 정상상태 지배방정식 = 38
3.3 이상 마찰 승수의 결정 = 44
3.4 보이드율의 계산 = 47
3.5 압력강하 계산 = 50
제3장 실험결과 및 고찰 = 53
제1절 단상유동 결과 = 53
제2절 이상유동 결과 = 59
2.1 Chisholm 변수에 의한 영향 = 59
2.2 마찰계수에 의한 영향 = 64
2.3 보이드율에 의한 영향 = 66
2.4 유동양식 = 73
제4장 결론 = 78
참고문헌 = 80
학술활동 및 산학협동 연구실적 = 85
Appendix I : Detailed schematic diagram = 87
감사의 글 = 9
Intended Reform in Hard Times
Full text linkThis study aims to examine the novel Hard Times as Dickens's humanistic attempt at social reform of his contemporary utilitarian thinking. Dickens believed the root cause of social evils was not in social systems or governmental regulations, but in a lack of humane treatment to one another in society. He did not advocate any immediate political radicalism in Hard Times, but rather maintained hope and opened a new vision for a better life through highlighting the inward value of people. A close character analysis reveals what happens to the characters who have experienced utter degradation when they were repressed by misguided materialistic beliefs, and how this in turn influenced their morality and social consciousness.
Utilitarianism, the most liberal idea of the Victorian age, fostered the strict philosophical thoughts of mechanical value, which only cares for hard facts and reasons. Dickens attacks this materialistic trend that produced a cold-hearted and distorted human view. The industrial revolution, combined with the laissez-faire economic doctrine, also is presented as another major target for criticism in Hard Times. The author harshly condemned the heartlessness of capitalism and selfishness of the bourgeoisie which aggravated the alienation of industrial workers. By creating Gradgrind and Stephen Blackpool, Dickens not only symbolizes the sterile thinking of utilitarian reformers, but also criticizes the governmental system which gave rise to torturing the working class.
Dickens clearly demonstrates that inhumanity provoked by nineteenth century materialism can only be dealt with by changing man's inward value. He sought to develop this vision through appealing to human feelings, solidarity and spiritual life which shown in the circus troupe and Sissy. The human qualities of innocence and spontaneity, which Sissy shared with the circus people, served to provide convincing evidence for Dickens's human reform. This kind of belief is deployed through his characters to evoke and sustain the animating quality of human life in Hard Times.
The introductory section gives a brief overview of Dickens and his works. Chapter two describes the historical background of the Victorian age. The next two chapters explore Dickens's symbolic patterns and unique conditions of his intended reform, represented in such characters as Gradgrind and Stephen Blackpool. The fourth chapter looks at Dickens's most obvious and sustained humanistic transformation through demonstrating ideal lifestyle of Sissy and the characters in the circus troupe. This study concludes by suggesting that Dickens played a certain part in opening a new vision for a better life in a mechanical age by stressing humane interactions and that he should be regarded alongside of his contemporaries who are acknowledged as pro-humanists.목차
I. 서론 = 1
II. 디킨즈와 빅토리아조 사회상 = 8
III. 그래드그라인드 : 공리주의 = 13
IV. 스티븐 블랙풀 : 노동문제 = 25
V. 씨시와 곡마단원 : 인간다움의 실현 = 36
VI. 결론 = 48
■ 인용문헌 = 51
■ Abstract = 5