Development Of A Semi-Swath Craft For Malaysian Waters

Small Waterplane Area Twin Hull (SWATH) and Catamaran vessels are known to have more stable platform as compared to mono-hulls. A further advantage of SWATH as compared to Catamaran is its smaller waterplane area that provides better seakeeping qualities. However, the significant drawback of the SWATH vessel is when encountering head-sea at high forward speed. Due to its low stiffness, it has a tendency for large pitch motions. Consequently, this may lead to excessive trim or even deck wetness. This phenomenon will not only degrade the comfortability but also results in structural damage with greater safety risks. In this research a modified SWATH design is proposed. The proposed design concept represents a combination of Catamaran and SWATH vessel hull features that will lead to reduce in bow-diving but still maintains good seakeeping capabilities. This is then called the Semi- SWATH vessel. In addition, the full-design of this vessel has been equipped by fixed fore fins and controllable aft fins attached on each lower hull. In the development of controllable aft fins, the PID controller system was applied to obtain an optimal vessel’s ride performance at speeds of 15 (medium) and 20 (high) knots. In this research work, the seakeeping performance of Semi-SWATH vessel was evaluated using time-domain simulation approach. The effect of fin stabilizer on the bare hull performance is considered. The validity of numerical evaluation was then compared with model experiments carried out in the Towing Tank at Marine Technology Laboratory, UTM. It is shown that the Semi-SWATH vessel with controllable fin stabilizer can have significantly reduction by about 42.57% of heave motion and 48.80% of pitch motion

Computer Simulation of Current Forces on Motion of Floating Production Storage and Offloading in Irregular Waves

This paper presents the effect of current forces on the motion of forces on Floating Production Storage and Offloading (FPSO) in irregular waves. The objective of this research is to compute the motion of FPSO in irregular waves by time domain simulation including the effect of current forces. A study is made on the slowly varying oscillations of a moored single body system in a current and waves. Linear potential theory is used to describe the fluid motion, and three-dimensional source distribution techniques are applied to obtain the hydrodynamic forces and transfer function of the wave exciting forces. OCIMF (1994) data are used for estimation of the current forces. The non-linear time domain simulations have been carried out in irregular waves. Based on it, slowly varying motion responses are examined including the effect of the current forces. Several environmental conditions, such as the current angle of attack, current velocity, significant wave height and mean wave period are considered, which may significantly affect FPSO motion in surge, sway and yaw moments. It is found that the effect of current forces is quite significant when the current velocity is increased. In this simulation, while the current velocity is increased to 3.0 meter/seconds, the impact on FPSO motion is quite significant, which should be taken into consideration from the point of view of safety, failure of mooring systems, operating responses and the dynamic positioning of the FPSO

Significance of teachers and education in promoting national economic development: A case study of Pakistan

The key objective of the present paper is to highlight the consequence of education along with the importance of teacher in education and its overall influence on the national economic development Pakistan.It is crystal clear that the role of education and teachers has become more important in improving human capital and consequently has a positive impact on the national development and prosperity.The results of this study show that teachers in all level including primary school, middle school teacher and high school teacher play a positive and statistically significant role in promoting national economic development.Therefore, these findings have some important policy implications.The government of Pakistan at both the federal and provincial levels needs to formulate appropriate and education promoting oriented policy in order to encourage education and increase quality trained teachers in the country. Consequently, it will further help to promote overall economy performance and largely mitigate poverty and improve social welfare in the country

Low-cost UAV for visible, NIR and thermal sensors platform

Low-cost UAVs have a limit on the sensor payload in dimension and acquire a higher number of aerial images in terms of image resolution and produced less accurate results. Therefore, accurate calibration will improve the quality of the image data. The objectives of this research are to develop fully autonomous lowcost hexacopter UAV, perform an accurate calibration of the multispectral sensor and develop a technique to monitor the vegetation cover using modified NDVI and thermal derived data. These studies cover components calibrations, diagnose problem, and flight planning using fully autonomous vertical take-off and landing capabilities and reduce the line-ofsight telemetry. The total cost of the Hexacopter UAV system is USD 2000, which is far cheaper than commercial UAV, with a weight less than 4kg and sensor payload up to 1.5 kg. The sensor calibration used were RGB (Canon SX230 RGB), NIR (SX230 670nm to 750nm, SX260 above 750nm, Tetracam 520 nm to 920 nm) and Thermal (MobIR M8 8 to 14 µm)

AN EXPERIMENTAL AND NUMERICAL PREDICTION OF MARINE PROPELLER NOISE UNDER CAVITATING AND NON-CAVITATING CONDITIONS

In this study, the hydrodynamics and noise prediction of a five blade marine propeller were analyzed through numerical and experimental methods under variety operational conditions. The hydrodynamics of the propeller was studied and the characteristic curves were presented in both numerical and experimental methods. Inception and development of sheet cavitation conditions are obtained in both numerical and experimental methods. The cavitation was started and developed by either increasing the propeller rotational speed in constant pressure or decreasing pressure, while the velocity was kept constant. Good agreements are observed between numerical and experimental results, qualitatively and quantitatively. The noise of the propeller was analyzed through Computational fluid dynamics (CFD) method, based on the formulation of Ffowcs Williams and Hawkings (FW-H). Similarly, the experimental results collected from hydrophones were compared with numerical simulations. Finally, the effects of reflection in cavitation tunnel were obtained by considering overall sound pressure levels in numerical and experimental results

Roll mitigation of small fishing boat

Heavy rolling motions experienced by small vessels give rise to many problems and disadvantages to the vessel and crew. This is undesirable especially during resonance when the encounter wave frequency coincides with the vessel natural frequency. Onboard activities, especially fishing, are affected because of difficulties due to the rolling motion. Heavy motion may lead to loss of personnel overboard or damage to onboard equipment, and also to structural failure and capsize phenomenon. The objective of this project is to develop and improve method for roll reduction and assess its performance. A Tsunami 22’ Fishermen boat and device to reduce the rolling motion have been selected for case study. The performance of the device has been analysed and tested on a model of the boat. The selected roll reduction device is a moving mass device. The moving mass device has been fabricated and evaluated its effectiveness by calm water roll decay test. It is found that the moving mass device is capable of reducing the rolling motion of the boat. The roll decay coefficient has been found increased up to 85.87%

The type of culture at a high performance schools and low performance school in the state of Kedah

This research aims to identify the type of culture at a High Performance School (HPS) and Low Performance School (LPS) in the state of Kedah. The research instrument used to measure the type of organizational culture was adapted from Organizational Culture Assessment Instrument (Cameron & Quinn, 2006) based on Competing Values Framework Quinn and Rohrbaugh (1983) Model.Two HPSs and two LPSs representing 129 teachers were chosen as research samples.Research findings showed that the current dominant culture in both HPS and LPS is Hierarchy (M=36.76, M=30.63 & SD = 8.23, SD=7.83) consecutively. Both types of schools practice Market culture and the average scores for both types of schools are the same whereby HPS (M=25.7,SD=8.56) and LPS (M=25.94, SD=8.32). However, HPS practices less Clan culture (M=21.15, SD=8.74) compared to LPS (M=24.18, SD=6.97). The Clan culture is more prominent in LPS compared to HPS. Both types of schools practice Adhocracy less which are (M=17.75, SD=6.94) in HPS and (M=19.81, SD=6.78) in LPS respectively. The findings showed that teachers in both types of schools would like to have the Clan culture practiced in their schools with the same average scores, M=34.89, SD=8.22. HPS prefers the Market culture (M=26.01, SD=6.32) compared to LPS Market culture (M=23.01, SD=.22). However they accepted Adhocracy less in HPS (M=20.02, SD=8.31) and LPS (M=21.58, SD=7.89). Nevertheless, Hierarchy culture in HPS (M=19.32, SD=6.45) and in LPS (M=21.05, SD=6.68) are widely practiced. From the comparisons made, it can be concluded that both types of schools widely practice the Hierarchy and Market cultures in schools.The recommendations for further studies were also suggested

The impact of information and communication technology on VMI performance

The aim of this paper is to examine the impact of information and communication technology dimensions namely information sharing, quality of information, and compatibility of information system towards VMI performance.Questionnaire was the main instrument for the study and it was gathered from 101 of suppliers in manufacturing companies.The findings show that information sharing and quality of information system contributes to service performance.Meanwhile, only quality of information system contributes to cost performance.Although, literature suggest that information sharing, quality of information, compatibility of information system have a positive impact on both cost reduction and service improvement in VMI program, this study shows that there is a limited effect on cost performance. In fact, compatibility of information system has not played any major role to increase performance of VMI program.This study recommends that the supplier should urge their customer to share demand information through the quality of information system

Alternative for rapid detection and screening of pork, chicken, and beef using dielectric properties in the frequency of 0.5 to 50 GHz

Dielectric property at high microwave frequency region has been utilized for possible rapid detection and screening of different types of meat, especially for halal authentication. This investigation focused on both raw and sterilized (processed) beef, pork, and chicken samples. Dielectric response that consists of dielectric constant and dielectric loss factor was measured over the range of 0.5 to 50 GHz. All raw and sterilized meat samples could be differentiated by the dielectric values. Two distinct peaks were observed only for both raw and sterilized pork samples at the frequency around 7.43 and 31.19 GHz. These peaks can potentially be linked to compounds that exist only in pork such as DNA, microbes, enzyme, proteins, amino acids, and many others. Dielectric values for sterilized samples were lower than raw samples due to molecule structural changes that occurred in the samples. The dielectric results promise a great potential of utilizing dielectric properties as a rapid on-site detection approach prior to subsequent laborious analysis