Ethical Standards for Employers in the Local Administration Units： Republic of Macedonia

The extensive research on public ethics in the local administration is more than necessary. This paper identifies the basic values of and the challenges to Macedonian Legal System in this area, and explains the key ethical aspects, which should be implemented in practice by civil servants, who increasingly have to learn how to perform in accordance with ethical values. In this paper I will analyze the ethical values of civil servants laid down by the Organization for Economic Co-operation and Development （OECD） and the Civil Servants Agency in Macedonia, upon which the ethical principles for civil servants in the local administration units are intended to be set. This paper deals with the ethics of civil servants, assessment of best practices, and evaluation of positive and negative indicators. The paper concludes with a few recommendations for the next steps in this process; and some criteria for the consideration of future developments are suggested.

Wide-band underwater acoustic absorption based on locally resonant unit and interpenetrating network structure

The interpenetrating network structure provides an interesting avenue to novel materials. Locally resonant phononic crystal （LRPC） exhibits excellent sound attenuation performance based on the periodical arrangement of sound wave scatters. Combining the LRPC concept and interpenetrating network glassy structure, this paper has developed a new material which can achieve a wide band underwater strong acoustic absorption. Underwater absorption coefficients of different samples were measured by the pulse tube. Measurement results show that the new material possesses excellent underwater acoustic effects in a wide frequency range.Moreover, in order to investigate impacts of locally resonant units,some defects are introduced into the sample. The experimental result and the theoretical calculation both show that locally resonant units being connected to a network structure play an important role in achieving a wide band strong acoustic absorption.

Bearing-only Visual SLAM for Small Unmanned Aerial Vehicles in GPS-denied Environments

This paper presents a hierarchical simultaneous localization and mapping（SLAM） system for a small unmanned aerial vehicle（UAV） using the output of an inertial measurement unit（IMU） and the bearing-only observations from an onboard monocular camera.A homography based approach is used to calculate the motion of the vehicle in 6 degrees of freedom by image feature match.This visual measurement is fused with the inertial outputs by an indirect extended Kalman filter（EKF） for attitude and velocity estimation.Then,another EKF is employed to estimate the position of the vehicle and the locations of the features in the map.Both simulations and experiments are carried out to test the performance of the proposed system.The result of the comparison with the referential global positioning system/inertial navigation system（GPS/INS） navigation indicates that the proposed SLAM can provide reliable and stable state estimation for small UAVs in GPS-denied environments.