39 research outputs found
A Study on the Development of Ship Operation Data Transmission System
Get PDFAutonomous vessels are becoming a hot topic in the global shipping industry. In the EU, Autonomous ship technology is rapidly developing. Autonomous vessels are expected to become a new paradigm to change and accelerate the digitization, platform connectivity and intelligence of the shipping industry. Over the past few years, the marine industry has maintained its competitive edge by securing operating competitiveness by reducing operating costs such as vessel size and oil costs. However, as with other industries, ICBM (Industry 4.0) IOT, Cloud, Big Data, Mobile), cyber security, simulation, etc., and to create new business by maximizing the unique capabilities of the shipping industry as defined in Shipping 4.0. Until recently, autonomous vessels were named as various types such as Smart Ship, Digital Ship, Connected Ship, Remote Ship, Unmanned Ship and Autonomous Ship. They were defined as MASS (Maritime Autonomous Surface Ship) by International Maritime Organization (IMO) This is a comprehensive product and service for the unmanned ship, autonomous transportation and efficient transportation in the stepwise upgrade for safety, reliability, and efficiency in ship operation.
In this paper, the research background and research scope is described in chapter 1, discussion about autonomous ship related contents are in chapter 2. The design and implementation of a large scale ship data transmission system including method of ship communication, data protocol and messaging processing technology to transmit and display large amount of data are describe in Section 3. The configuration and results of the experimental environment are in Section 4. Then finally the conclusion and further studies are described.
Chapter 2 - Autonomous vessels are that incorporate ship control systems and communication technologies that enable wireless monitoring and control, including improved decision support systems and remote control and autonomous navigation capabilities. The control function for the autonomous vessels is implemented in the Shore Control Center (SCC). In order to accurately recognize the situation of the ship at the remote land control center, the existing systems such as AIS and RADAR are equipped with thermal cameras, LIDAR an advanced sensor module is added to the vessel to replace the existing sailing company's watch keeping operations with the landlord and system. The land control center simultaneously monitors the safe operation of autonomous vessels, manages the voyage plan update and autonomous navigation system, and manages the maintenance plan for autonomous vessels.
Chapter 3 - In this paper, we constructed and implemented a large capacity ship data acquisition and transmission system that can collect, process, and transmit data generated from ships. The required physical configuration is largely divided into onboard and onshore, and by design, it can have n ships and n land. On the ship side, data are collected from navigation equipment and AMS (Alarm Monitoring System) such as RADAR, Speed Log, Doppler, Gyro Compass and GPS, processed and stored for use on land and onboard service applications, The land consists of a server composed of modules capable of receiving data from various ships and transmitting them to a required place after processing, and servers for service application. The user is connected to the web browser on the PC and configured to use services such as flight information monitoring.
Chapter 4 - Experiments were conducted on the large scale ship data acquisition and transmission system implemented in this paper by constructing an environment in the T/V Hanbada Lab. For each unit function, the experiment proceeded while the Kongsberg simulator and the training line were at anchor, and the integrated test for the stability and function of the data was conducted during the long voyage.
Chapter 5 - In this study, the research was carried out in order to process the ship’s navigation data generated from various equipment for several number of vessels in terms of ship operation data and remote control center technology for this purpose. For the research on application system implementation and verify evaluation, an analysis of a data collection and process on ship and shoreside and design of data transmission has been studied. Also for this research, the basic research knowledge were achieved together with research results on ship data processing and transmission. The newly developed web based system can used to monitor ship’s data in real-time on the shoreside.1. 서 론
1.1 연구의 배경 및 목적 1
1.2 연구의 범위와 방법 4
1.3 논문의 구성 4
1.4 연구의 절차 5
2. 기술동향 분석
2.1 e-Navigation 6
2.1.1 e-Navigation 정의 6
2.1.2 e-Navigation 아키텍쳐 7
2.1.3 MSP(Marine Service Portfolios) 8
2.2 자율운항선박의 육상 관제 9
2.2.1 자율운항선박의 정의 9
2.2.2 육상관제 센터 9
2.3 선박 데이터 수집 11
2.3.1 NMEA0183 Sentence 13
2.3.2 Modbus 18
2.4 Kafka 메시징 시스템 25
2.4.1 MOM- Kafka 개념 26
2.4.2 MOM - Kafka 특징 28
2.5 다중이용자에 의한 메세지 전달 방법 30
3. 운항 정보전송 시스템 설계
3.1 개발 방향 33
3.2 성능 구현 35
3.3 데이터 수집과 시스템 36
3.3.1 하드웨어 데이터 수집 장비 개발 36
3.3.2 소프트웨어 데이터 수집 장비 개발 39
3.4 데이터 프로세싱 및 Web UI 구현 47
4. 운항 정보전송 시스템 구현
4.1 단위 및 통합 성능 시험 52
4.2 실험 및 결과 56
4.2.1 단위 기능 실험 및 평가 56
4.2.2 통합 기능 및 성능 실험 60
5. 결론 63
참고문헌 66Maste
Design of Fuzzy Controller Based on State Variables Combination for Stabilizing Inverted Pendulum System
Get PDFThe inverted pendulum system is a typical nonlinear unstable system because this system tend to fall down when its does not exert to proper force. Therefore inverted pendulum system is a common, interesting control problem that involves many basic elements of control theory. In the early, controls of stabilization for the inverted pendulum system were used classical methods like PD, PID controller. In recently, however, control methods based on modern and intelligent control theory are widely applied.
In particular, fuzzy logic controller which is often used in nonlinear control is a little too hard to design due to increasing fuzzy rules rapidly if the given system like inverted pendulum has many state variables. Also, in case the state variables is tied with two parts, two fuzzy controller is designed in the one control system. In this paper, therefore, propose Fuzzy Controller based on State variables Combination(FCSC) that applies only one of the fuzzy controller using the input variables as two new reorganized signals by combination properly for the four state variables of the inverted pendulum system. Proposed method apply to the inverted pendulum system and control performance is demonstrated through simulation.제 1 장 서론
1.1 연구 배경
1.2 연구 내용과 구성
제 2 장 도립진자 시스템의 모델링
2.1 도립진자 시스템의 비선형 모델
2.2 구동부를 포함한 도립진자 시스템의 선형모델
제 3 장 퍼지 제어 이론
3.1 퍼지이론
3.1.1 퍼지집합
3.2 퍼지로직 시스템
제 4 장 퍼지 제어기 설계
4.1 변수조합 퍼지 제어기 설계
4.2 일반적인 퍼지 제어기 설계
제 5 장 시뮬레이션 및 검토
5.1 도립진자 시스템의 비선형 모델
5.2 응답특성
5.2.1 일반적인 퍼지 제어기 응답특성
5.2.2 변수조합 퍼지 제어기 응답특성
제 6 장 결 론
참 고 문
Effects of Mill conditions of the Microstructures and the Mechanical Properties of Non-heat-treated Steel for Cold Heading
No full textMaste
자일리톨에 의한 1α,25(OH)2D3-induced osteoclastogenesis 억제 효과
No full textDept. of Dental Science/박사[한글]
자일리톨은 식물에 존재하는 5탄당의 당알콜으로 항 우식 효과 등 여러 가지 다양한 기능을 가지고 있다. 이전의 연구에서 자일리톨이 골 흡수를 감소시키고 골 강도를 증가 시킨다는 논문들이 발표 되었으나 분자 생물학적인 기전은 아직 보고된 바가 없었다.
본 연구는 활성형 비타민 D3나 sRANKL을 공존 배양계와 RAW 264.7에 투여하여 파골세포 분화를 유도한 후에 자일리톨 1, 10, 30, 50, 그리고 100mM을 각각 투여하여 대조군과 비교 분석하였다. 먼저, 형성된 TRAP양성 파골세포 수를 계수한 결과 공존 배양계와 RAW 264.7 모두에서 자일리톨 농도 증가에 비례하여 핵이 3개 이상인 파골세포 수가 점차 감소하였다. 또한 bone slice상에서 골 흡수 능력을 비교한 결과에서도 감소하였다. 세포 독성능 검사 결과 자일리톨 50mM 이하에서는 독성이 없었다.
자일리톨의 파골세포분화 억제 기전을 규명하기 위하여 조골세포에서 골흡수 기전의 중요 Cytokine인 골흡수 촉진인자 (RANKL)와 골흡수 억제인자(OPG)의 mRNA 양(by RT-PCR)과, 최종 생산된 단백질의 양(by ELISA)을 측정하였다. 그 결과 자일리톨 농도가 증가 함에 따라 RANKL 및 mRNA 양이 점차적으로 감소하였다. 반면에 OPG 에는 변화가 없었다. 자일리톨이 조골세포 뿐 아니라 파골세포에도 직접 작용하는지 알아 보고자 RAW 264.7을 이용하여 파골 세포로 분화된 다핵세포 수를 계수한 결과, 그 숫자 또한 자일리톨 농도가 증가 함에 따라 점차 감소하였다. RAW264.7에서 세포내 신호전달 물질 중 하나인 JNK와 ERK를 Western blot을 이용하여 조사 하였다. 자일리톨을 투여한 결과 활성형인 p-JNK와 p-ERK가 대조군에 비해서 감소하였다.
결론적으로 자일리톨은 조골세포에서 골 흡수 촉진인자인 RANKL의 발현을 억제하고 파골세포 내에서 신호 전달 물질인 JNK와 ERK의 활성을 감소 시킴으로써 파골세포 분화를 억제하였다
[영문]Xylitol has a variety of functions to cells, such as bacteriostatic, and anticariogenic effects. However, understanding of cellular mechanism for the role of xylitol on bone metabolism remains to be solved. In this study, the physiological role of xylitol in osteoclastogenesis was exploited in a co-culture system and RAW 264.7 cell. Xylitol reduced the number of tartrate-resistant acid phosphatase (TRAP) positive multinucleated cells. The number of multinucleated osteoclast cell not only in co-culture system but also in RAW 264.7 cell exposured to medium containing 1, 10, 30, 50, and 100 mM of xylitol was reduced in a dose dependent manner. Bone resorption activity, which was performed on the bone slice in co-culture system, was dramatically decreased as xylitol concentration increasing. According to the viability test, there was no cellular damage at up to 100 mM of xylitol. In order to investigate the mechanism by which xylitol inhibits osteoclastogenesis, the mRNA expressions of receptor activator of NF-B ligand (RANKL) and osteoprotegerin (OPG) were analyzed by RT-PCR. Exposure of osteoblastic cells to a medium containing of xylitol reduced RANKL mRNA expression induced by 10-8M 1, 25(OH)2D3 in a dose-dependent manner. In addition, RANKL and OPG protein were also analyzed with ELISA using anti-RANKL and anti-OPG antibody. The expression of RANKL was decreased with the increase of xylitol concentration. The amount of OPG was slightly increased in the presence of xylitol, but there was no statistically significant difference. Nonetheless these results imply that xylitol inhibits osteoclast differentiation by reducing RANKL/OPG ratio in osteoblast. Also, we found that the phosphorylation of c-Jun NH2-terminal Kinase (JNK) and Extracellular Signal-regulated Kinase(ERK), which regulates the activity of various transcriptional factors, was reduced by xylitol treatment in RAW 264.7 cells.
Conclusively, these findings suggest that xylitol down-regulates the 1α,25(OH)2D3- induced osteoclastogenesis via partly modulation of RANKL/ RANK/ OPG regulatory axis and the decrement of phosphorylation of MAPK in preosteoclast.ope
