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염분이 함유된 폐수의 생물학적 처리시 염분농도가 오염물질의 제거에 미치는 영향
김상수,문병현,이택순,서규태,공남식 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Effects of salt concentration and C/N ratio on pollutants removal efficiencies were investigated in treatment of seafood wastewater by sequence batch reactor(SBR). The synthetic seafood wastewater containing salinity from 3,000 to 10,000 mg/L NaCI and C/N ratio of 2 and 4 was treated by SBR. Removal efficiencies of COD_(Mn), T-N, and T-P decreased with increasing salt concentration, but eventually reached a pollutants removal a platrau. As systems adapted in salts until salts concentration of 8,000mg/L, the time required to reach the pollutants removal efficiencies at steady state was reduced. However, the removal efficiencies of pollutants sharply decreased and the time require to reach steady state was increased as salt concentration rose to 10,000mg/L, Removal efficiencies of COD_(Mn) were higher for C/N ratio of 4 than for 2. Effects of salt on the nitrogen removal were not faster than the organic removal but the time required to the nitrogen removal at steady state was ncreased. The removal efficiencies of phosphorus also were redueed as salt concentration increased, which inhibited the release of phosphorus than the uptake.
Position Determination Using the DTV Segment Sync Signal
Moon, Gong-Bo,Jee, Gyu-In,Lee, Jang-Gyu 제어로봇시스템학회 2011 Transaction on control, automation and systems eng Vol. No.
As a supplement to the Global Positioning System (GPS) in an urban center and indoor environment, the digital television (DTV) segment sync signal can be employed to obtain a mobile user's position. Two DTV receivers and a counter are integrated to measure the time difference of arrival (TDOA) for a pair of received signals from a transmitter and its corresponding repeater (DTVR). Using the measurements from a transmitter and its multiple corresponding DTVR pairs, the mobile user position can be estimated using the recursive least square method. An experiment done in Seoul using two low-grade high resolution digital television (HDTV) receivers and a two-channel universal counter demonstrates that the mean value of the mobile user position measurement is accurate to 42.58 meters circular error probability (CEP).
Gong Bo Moon,Sebum Chun,Moon-Beom Hur,Gyu-In Jee 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
A positioning method for a first responder in an indoor emergency environment is needed to strengthen a safety for rescue operation. In Korea, it is focused as one of the national agenda. Though many researches are done in this field, but they still have limitations of system preloading and a poor positioning accuracy depending on an arbitrary situation. This paper presents a robust indoor positioning system for the first responder in the scene of fire. The proposed positioning system consists of a monitoring station outside a building, portable access points (APs), and first responders. In the first place, the first responder measure distances to other first responders and portable APs in the hearable range, and calculates its relative position utilizing the simultaneous localization and mapping (SLAM) method implemented with the Extended Kalman Filter (EKF). In this process, the position information stored in the APs and first responders can serve as a map for the others. Then the initial position guess and distance measurements are delivered to the monitoring station via ad-hoc network by portable APs and first responders to correct position estimates of those in the whole system. The monitoring station also uses EKF SLAM method with all available position estimates and distance measurements. In this paper, the system configuration and positioning method are presented, and the simulation on the positioning of the portable APs and the first responders with respect to the monitoring station is carried out to certify the feasibility of the proposed system.
An Indoor Positioning System for a First Responder in an Emergency Environment
Gong Bo Moon,Moon Beom Hur,Gyu-In Jee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
An indoor positioning system for a first responder in an emergency environment is focused as one of the national agenda in Korea. In this area, many researches are carried out, still there left limitations of a system installation and an inconsistent positioning accuracy in the arbitrary emergency environment. This paper presents a new indoor positioning system for the first responder, especially firemen in the scene of a fire. The portability and adaptability for the emergency environment are mainly considered for a feasibility of the proposed system. With portable access points (APs), which can measure ranges to the other AP and the firemen based on IEEE 820.15.4a, in an indoor environment and a monitoring station in an outdoor environment, a control unit outside a building in fire can determine the position of the firemen and deployed APs using the Extended Kalman Filter (EKF) and the simultaneous localization and mapping (SLAM) methods. In this paper, the concept and positioning procedure of the proposed system are introduced. An experiment on ranging is done to analyze an error characteristic of measurements, then the result is applied to a simulation for the positioning system to certify the possibility of the system operation in the emergency environment. The simulation result shows that the proposed indoor positioning system can be applied to help the firemen escape from the emergency environment safely.
THERMO-MECHANICAL COUPLED ANALYSIS OF HOT PRESS FORMING WITH 22MnB5 STEEL
Hyung-gyu Kim,Chanhee Won,Seungho Choi,Moon-gyu Gong,Joon-gyu Park,Heejong Lee,Jonghun Yoon 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.4
This paper mainly concerns the thermo-mechanical analysis to evaluate the process parameters in the hot press forming with the 22MnB5 sheet such as the austenitization temperature, transport and quenching time for enhancing the efficiency in the production cycle. It is noted that the transport time is most influencing process parameter in the hot press forming to increase production efficiency without sacrificing the strength of the final product. In addition, we newly proposed a scheme to reproduce the flow curves of the hot stamped 22MnB5 sheet with respect to the martensite fraction by correlating the numerical analyses and tensile test results. To take into consideration of the strength variation in the hot stamped door impact beam, entire part is partitioned into several domains on which adaptive flow curves are assigned with respect to the martensite fraction. It demonstrates a good agreement with experimental 3-point bending test with the hot stamped door impact beam when applying the proposed method adopting adaptive flow curves with respect to the martensite fraction.
Optical Communication Method using CCR
Gong Bo Moon,Chan Gook Park,Jang Gyu Lee 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
These days, wireless sensor network, which has a base station and sensor nodes, is widely used. Sensor nodes are located at certain positions to gather the environmental information around them. Then they need to transmit measured data to base station or other sensor nodes. Currently, most of them are using RF (radio frequency) method for communication. This method has a security problem and needs extra modulator and demodulator to handle RF signals In this paper, to avoid these problems, communication method via optical channel is proposed. This method only needs light source and CCR (corner cube retro-reflector). First, it is checked whether proposed method can be implemented or not. Next, applicable procedure, which includes error detection, for optical communication is developed. Finally, experimental result is shown to verify that the proposed method works with real system.
CCR 반사경과 Manchester Coding을 이용한 광(光)통신 기법
문공보(Gong-Bo Moon),박찬국(Chan-Gook Park),이장규(Jang-Gyu Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
최근 활발한 연구가 진행되고 있는 센서 네트워크 시스템은 센서 노드 주변에서 수집된 환경 정보를 베이스로 전달하여 정보를 통합하는 시스템이다. 다양한 환경에 적용하기 위하여 정보 전달에 주로 무선 채널을 활용하는데 기존과 같이 라디오 주파수 채널을 이용하는 경우 센서 노드가 복잡해지고, 도청의 위험성이 존재한다. 본 논문에서는 이러한 단점을 피하기 위해 광(光)채널을 형성하고, 이를 이용하여 데이터를 전송하는 기법을 제안한다.
Jeongpyo Park,Young-Jin Moon,Min-Gyu Jeong,Jin-Gyu Kang,Sang-Hyun Kim,Jung-Chul Gong,Changsik Yoo IEEE 2016 IEEE transactions on industrial electronics Vol.63 No.6
<P>A quasi-resonant (QR) controller with an adaptive frequency reduction scheme has been developed for a flyback converter. While maintaining the valley switching, the QR controller reduces the switching frequency for lighter load by skipping some valleys to reduce the power loss and thereby achieve better light-load efficiency. If the QR controller cannot detect any valley due to the damped oscillation of switch voltage, then the valley switching is given up and the nonvalley switching is employed to keep reducing the switching frequency for lighter load. The proposed QR controller has been implemented in a 0.35-mu m 700-V BCDMOS process and applied to a 40-W flyback converter. The power efficiency of the flyback converter is improved by upto 3.0% when the proposed QR controller is employed compared to the one employing the conventional QR controller.</P>