능동형 RFID를 이용한 RTLS의 설계 및 구현

정동호,김정효,지동환,백윤주,Jung, Dong-Ho,Kim, Jung-Hyo,Ji, Dong-Hwan,Baek, Yun-Ju 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.12A

RFID 기술은 대표적으로 인식, 실시간 추적, 보안 등의 분야에 적용할 수 있으며, 이중에서 실시간 추적의 경우 대상의 위치를 실시간으로 파악함으로써 흐름을 제어하고 비용을 절감할 수 있다. 최근 들어 이러한 실시간 추적의 응용으로 RTLS(Real-Time Locating System)에 대한 관심이 증가하고 있다. 이에 본 논문에서는 표준과의 호환성과 확장성을 고려하여 RTLS 전체 시스템을 설계하고 구현하였다. 호환성을 위해 433MHz RTLS 표준에서 제시된 프로토콜을 준수하여 시스템을 설계하고 하드웨어 상에서 구현하였다. 그리고 리더간의 무선 통신이 가능하게 함으로써 RTLS 전체 시스템을 확장시켰다. 이의 검증을 위하여 실제 야외 환경에서 태그의 위치 정확도를 측정하였고 시뮬레이션을 통해 본 논문에서 제시한 리더간의 데이터 전달 기법에 대해서도 성능평가를 하였다. Interest to the RTLS that is one of RFID applications is increasing in recent. The RTLS(Real Time Locating Systems) is one of applications for locating and tracking using RFID tags which are attached to something like container, pallet, or all the things. This paper presents the design and the implementation of an RTLS system using 433MHz active RFID tags and use radio frequency to provide the scalability. Our system we developed using RFID platform takes into account an RTLS standard. Also, in this paper a routing protocol is included to data delivery to server via each reader. In order to perform the evaluation, in addition, some experiments in out door are performed and results such as error metric and distance are also included. Furthermore, simulation for the routing protocol we supposed is also included.

해저 배관의 허용 노출길이 산정에 대한 이론해석

정동호,이용두,박한일,Jung Dong-Ho,Lee Yong-Doo,Park Han-Il 한국해양환경·에너지학회 2003 한국해양환경·에너지학회지 Vol.6 No.3

해저배관은 지반쇄굴로 인하여 일부분이 노출되어 자유경간이 형성될 수 있다. 자유경간이 형성되면 환경하중 및 와동유기진동에 의해서 안정성을 잃을 수 있다. 본 연구에서는 해저배관의 안정성을 위협하는 중요 요소인 자유경간의 정적 및 동적 경간을 결정하는 방법을 제시한다. 자유경간 해석에서는 해저배관에 작용하는 압축력 효과를 고려하였으며 토양의 종류에 따라 경계조건을 일반화시켰다. 자유경간 양단의 해저지반은 탄성기초로 간주하였으며, 이들 선형 및 회전 스프링으로 치환하여 경계조건을 일반화시켰다. 정적 및 동적 자유경간의 길이를 산정 할 수 있는 무차원화 된 곡선을 구하였다. 예제해석을 수행하여 그 적용방법을 소개하였다. 본 연구결과는 자유경간을 갖는 해저배관의 설계에 유용하게 적용될 수 있다. The free span of a subsea pipeline due to seabed scouring can result in structural failure by severe ocean environmental loads and vortex induced vibrations. This Paper examines the safety of subsea pipelines with free spans under axial compressive load. The variation of allowable lengths of static and dynamic free spans is examined for generalized boundary conditions. The free span is modelled as a beam with an elastic foundations and the boundary condition is replaced by linear and rotational springs at each end. The static and dynamic free span curves are obtained with a function of non-dimensional parameters. A case study is carried out to introduce the application method of the curve. The results of this study can be usefully applied for the design of subsea pipelines with a free span.

여성 CEO의 리더십이 조직몰입과 조직시민행동에 미치는 영향: 변혁적 리더십과 서번트 리더십을 중심으로

정동호,서정해,Jung, Dong-Ho,Seo, Jung-Hae 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3

21세기에 들어 생산성 향상에 크게 기여하는 여성성이 부각되면서 기업 내 여성인력이 증가하고 있다. 이러한 현상은 기업혁신의 주도자이면서 기업 경쟁력의 원천으로 여성을 새롭게 인식함으로써, 여성 CEO의 리더십과 조직 구성원 특성인 조직몰입과 조직시민행동과의 관련성을 파악할 필요성이 강조되었다. 본 연구는 2017년 3월 16일부터 3월 31일까지 서울, 경기에 위치하고 있는 중소기업 중, 여성이 CEO인 기업의 종사자를 대상으로 설문을 실시하였다. 자료분석은 SPSS 20.0을 이용하여 빈도분석, 요인분석, 신뢰도분석, 위계적 회귀분석을 실시하였고, AMOS 20.0을 이용하여 구조방정식 모형과 sobel-test를 통해 가설을 검증하였다. 여성 CEO 리더십은 변혁적 리더십과 서번트 리더십으로 구분하였고, 조직몰입과 조직시민행동은 단일차원으로 구성되었다. 변혁적 리더십과 서번트 리더십은 조직몰입에 정(+)의 유의한 영향을 미쳤고, 변혁적 리더십은 조직시민행동에 정(+)의 유의한 영향을 미쳤으나, 서번트 리더십은 조직시민행동에 유의한 영향을 미치지 않는 것으로 나타났다. 조직몰입은 조직시민행동에 정(+)의 유의한 영향을 미치는 것으로 나타났다. 또한 변혁적 리더십, 서번트 리더십과 조직시민행동과의 관계에서 조직몰입은 매개효과가 있음을 입증하였다. As femininity contributes to enhanced productivity in the 21st century, female human resources have increased in enterprises. The necessity to grasp the relationship between the female CEO leadership, organizational commitment, and the organizational citizenship behavior, which are characteristics of members of the organization, has been emphasized. For this research, a questionnaire survey was conducted on employees of small and medium-sized enterprises which have a female CEO in the Seoul and Gyeonggi-do regions from March 16, 2017, to March 31, 2017. For data analysis, frequency analysis, reliability analysis, factor analysis, and hierarchical regression analysis were conducted using SPSS 20.0, and hypotheses were verified through the structural equation model and Sobel test using AMOS 20.0. The types of female CEO leadership were classified into transformational leadership and servant leadership, and organizational commitment and organizational citizenship behavior were each composed of a single dimension. It was found that transformational leadership and servant leadership had positive (+) significant effects on organizational commitment, and transformational leadership had positive (+) significant effects on organizational citizenship behavior. However, servant leadership had no significant effects on organizational citizenship behavior. It was found that organizational commitment had positive (+) significant effects on organizational citizenship behavior. Also, it was found that organizational commitment had a mediating effect on the relationships between transformational leadership, servant leadership, and organizational citizenship behavior.

교회건축의 채광방식에 의한 단면유형 연구

정동호(Jung Dong-Ho),김동진(Kim Dong-Jin) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1

The light in terms of the building of church have been used the mean to see obviously the relationship between human and God, also, piety, spirit rather than a simple light that comes in through a window. Historically, construction has been developed continuously because of technique and the advanced materials. Finally that brings big change. In this study, we want to study deeply Section of the lighting method that is the part to influence worship space directly in the diverse architecture of church. First, we are suppose to analyze the Section of the lighting method. Specially we will study the place of the worship that is expressed remarkably like Le corbusier, Alvar Aalto, Louis I. Khan, Mario botta, Richard Meier that bring up the modem church model in the latter half of 1800s. In the basic of that, we explored a representative building that is selected with being related in lighting that will be studied specially. Also, we're supposed to comprehend correlativity of day lighting according to the plan of worship function through the field work. In addition, we're going to study to analyze the section type by the basic plan in the architecture of church.

Effect of Wick of Subirrigation System on Root-Zone Environment of Kalanchoe

Dong-Ho Jung(정동호),Jung-Eek Son(손정익) 한국원예학회 2000 원예과학기술지 Vol.18 No.5

부유식 파력발전장치용 계류선의 설계 및 안전성 검토에 관한 연구

정동호(Dong-Ho Jung),남보우(Bo-Woo Nam),신승호(Seung-Ho Shin),김현주(Hyeon-Ju Kim),이호생(Ho-Saeng Lee),문덕수(Deok-Soo Moon),송제하(Je-Ha Song) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.4

A study was performed on the design of a mooring line to maintain the position of a floating WEC (wave engergy converison) system. The procedure to design a mooring line is set up and the safety of the designed mooring system is evaluated using commercial software, Orcaflex. The characteristics curve for one line is analyzed to determine the properties and pretension of a mooring line. While considering the ocean environmental condition and importance of a floating WEC system, a multi-line layout is determined. A 4-point mooring system with 4 lines shows the instability in the yaw motion of the floating WEC system under a designed ocean environmental conditon. The redesigned 4-point mooring system with 8 lines is found to be safe on the condtion of a harsh ocean environment. The floating WEC system with the redesigned mooring system also shows stable motion in surge and pithc under operating condition. From a parametric study on the mooring line length, the extreme value of the mooring line tension is found to be very sensitive to the pretension and length of mooring line. The results of this study can contribute to the establishment of a design procedure for mooring lines.

한국 최초의 LNG벙커링 바지시스템 개발

정동호(Dong-Ho Jung):오승훈(Seung-Hoon Oh):정재환(Jae-Hwan Jung):황성철(Sung-Chul Hwang):성홍근(Hong-Gun Sung):이재익,김은석 한국항해항만학회 2018 한국항해항만학회 학술대회논문집 Vol.2018 No.추계

본 연구에서는 국내 최초로 개발되는 LNG벙커링 바지시스템 개발에 관하여 소개한다. 벙커링바지는 500cbm의 용량을 가지며, LNG추진 ready 개념으로 개발된다. 핵심기술로는 벙커링바지의 설계, 설계된 바지의 안정성 평가 및 Ship-To-Ship 안정성평가 기술, 고망간강 Type-C 저장탱크 설계 및 제작 기술, 적하역을 고려한 공정시스템 설계 및 실증, 열량유량시스템 설계 및 실증, 가스공급시스템 설계 및 실증, 각종 유틸리티의 설계 및 실증 기술, 적하역 절차서 등이 개발된다. 설계부터 건조까지 전 과정을 국내 기술을 적용하여 개발하며, 국내에서 개발된 선급인증된 기자재가 최대한 적용되도록 한다. 국내 기업들이 LNG 구조물에 관한 track-record를 확보하여 향후, 산업화에 기여할 수 있도록 한다. This study introduces the R& D project of development of the 1st LNG bunkering barge in Korea. The Design and pilot test of Barge-To-Ship 500cbm LNG bunkering barge system for coastal trading LNG-fueled ship is proposed. The following technologies will be developed from the project ; Basic/Detail design and pilot test of LNG Bunkering barge system, Basic/Detail design and pilot test of LNG bunkering process system considering LNG loading/unloading, Basic/Detail design and pilot test of 500cbm LNG tank in type-C, Evaluation of bunkering performance according to conditions (environment, SIMOPs) by numerical simulation, Performance evaluation of bunkering barge, towed barge and Barge-To-Ship motion considering ocean environment load, and scenario in Barge-To-Ship LNG bunkering. This project will contribute expansion to LNG-fueled ship industry and pave the way to establish LNG bunkering hub port.

실해역 환경에서 생물부착에 관한 기초실험 연구

정동호(Dong-Ho Jung),김아리(Ah-Ree Kim),문덕수(Deok-Soo Moon),이승원(Seung-Won Lee),김현주(Hyeon-Ju Kim),함윤호(Yun-Ho Ham) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.6

A flow and low temperature of deep seawater the biofouling properties in a seawater environment of different materials, such as a steel pipe, polyethylene pipe, and nylon net used for ocean industries. Experiments in a real sea environment were performed to grasp the quantitative and qualitative biofouling from diatoms attached to materials by measuring the Chlorophyll-a density. Experimental samples were placed under five types of ocean environmental conditions and analyzed every month for five months. It is shown that the biofouling by diatoms was strongly affected by the seawater temperature for all of the experimental samples. It was found that diatoms mainly adhered to the nylon net while crustaceans prefer polyethylene, under a high temperature condition. It is believed that the biofouling properties are strongly related to the surface roughness of a material. The biofouling under the low temperature condition of deep seawater was rare and stable for the experimental periods. The inside of a pipe conveying deep seawater can be presumed to remain clear without biofouling on the condition of a flow and low temperature of deep seawater.

Water Absorption Characteristics in Wick Treatments and Potted Plant Growth in Wick-Used Subirrigation System

Dong Ho Jung(정동호),Jung Eek Son(손정익),Yin Ji Lu(노은희) 한국원예학회 2001 한국원예학회 학술발표요지 Vol.2001 No.5

흘림형 저면관수시스템에서 칼랑코에 ‘New Alter’의 생육에 대한 재식 밀도, 배지 조성 및 관수 방식의 효과

정동호(Dong Ho Jung),손정익(Jung Eek Son) 한국원예학회 2002 한국원예학회 학술발표요지 Vol.2002 No.6