Pusan National University

About: Pusan National University is a education organization based out in Busan, South Korea. It is known for research contribution in the topics: Population & Catalysis. The organization has 24124 authors who have published 45054 publications receiving 819356 citations. The organization is also known as: Busan National University & Pusan University.

Ship-Shaped Offshore Installations : Design, Building, and Operation

Abstract: Ship-shaped offshore units are some of the more economical systems for the development of offshore oil and gas, and are often preferred in marginal fields These systems are especially attractive to develop oil and gas fields in deep and ultra-deep water areas and remote locations away from existing pipeline infrastructures Recently, the ship-shaped offshore units have been applied to near shore oil and gas terminals This 2007 text is an ideal reference on the technologies for design, building and operation of ship-shaped offshore units, within inevitable space requirements The book includes a range of topics, from the initial contracting strategy to decommissioning and the removal of the units concerned Coverage includes both fundamental theory and principles of the individual technologies This book will be useful to students who will be approaching the subject for the first time as well as designers working on the engineering for ship-shaped offshore installations

Solution-derived 40 µm vertically aligned ZnO nanowire arrays as photoelectrodes in dye-sensitized solar cells

Abstract: Well-aligned ZnO nanowire arrays with a long length of more than 40? ?m were prepared successfully by using the polyethylenimine (PEI)-assisted preheating hydrothermal method (PAPHT). Several important synthetic parameters such as PEI content, growth time, preheating time and zinc salt concentration were found to determine the growth of ultralong ZnO nanowire arrays, including length, diameter, density and alignment degree. The photoluminescence (PL) spectrum of as-grown ultralong ZnO nanowire arrays revealed a UV emission and a yellow emission, which was attributed to the absorbed hydroxyl group based on the peak shift after annealing in various atmospheres. The performance of dye-sensitized solar cells (DSSCs) increased with increasing length of ZnO nanowire arrays, which was mainly ascribed to the aggrandized photocurrent and reduced recombination loss according to electrochemical impedance spectroscopy (EIS). A maximum efficiency of 1.3% for a cell with a short-circuit current density (Jsc) = 4.26?mA?cm2, open-circuit voltage (Voc) = 0.69?V and (fill factor) FF = 0.42 was achieved with a length of 40??m.

RFID-Based Real-Time Locating System for Construction Safety Management

Abstract: This paper presents the development of a radiofrequency identification (RFID)–based real-time locating system (RTLS) for safety management. The particular focus of this paper is the creation of the RTLS, which provides accurate and robust localization performance in construction sites where it is otherwise very difficult to maintain signal availability because of many (moving) obstacles. Adopted were the Time of arrival method as a localization method, the Chirp spread spectrum as a wireless networking technology, and the Assistant Tag as a way to maintain enough signal availability for effective communication. In addition, the developed RTLS uses RFID to retain the latter’s benefits (e.g., data storage, transfer capability, relatively inexpensive installation cost). To demonstrate the RTLS’s localization performance, two case studies have been conducted; the results show great potential for use in improving construction site safety management.