• 제목/요약/키워드: graph construction

검색결과 202건 처리시간 0.034초

Communication Performance of BLE-based IoT Devices and Routers for Tracking Indoor Construction Resources

  • Yoo, Moo-Young;Yoo, Sung Geun;Park, Sangil
    • International Journal of Internet, Broadcasting and Communication
    • /
    • 제11권1호
    • /
    • pp.27-38
    • /
    • 2019
  • Sensors collect information for Internet of Things (IoT)-based services. However, indoor construction sites have a poor communication environment and many interfering elements that make it difficult to collect sensor information. In this study, a network was constructed between a Bluetooth Low Energy (BLE)-based IoT device based on a serverless IoT framework and a router. This experimental environment was applied to large- and small-scale indoor construction sites. Experiments were performed to test the communication performance of BLE-based IoT devices and routers at indoor construction sites. An analysis of the received signal strength indication (RSSI) graph patterns collected from the communication between the BLE-based IoT devices and routers for different testbed site situation revealed areas with good communication performance and poor communication performance due to interfering factors. The results confirmed that structural components of the building as well as the materials, equipment, and temporary facilities used in indoor construction interfere with the communication performance. Construction project managers will require improved technical knowledge of IoT, such as optimizing the router placement and matching communication between the router and workers, to improve the communication performance for large-scale indoor construction.

건설 현장 관리자 역량의 인과관계 구조 분석 (An Analysis of the Casual Relations on Construction Project Manager's level Competency)

  • 김도엽;김화랑;장현승
    • 대한건축학회논문집:구조계
    • /
    • 제34권3호
    • /
    • pp.77-86
    • /
    • 2018
  • Recently, Korean construction industry is moving from quantitative growth to qualitative growth. Among the changes in the construction industry, the competency of the project manager who represents the construction project as well as the construction company has been referred to as a factor that effects qualitative growth. This research utilized previous research analysis and expert interview in order to extract essential competency factors of a construction project manager. DEMATEL method was utilized to analyze the quantitative and objective causal relationship between the competency factors. The causal relationship of the competency factors were visualized through Digraph (directed graph) and competency areas of the project manager that requires strengthening were also suggested. Analysis result showed that the important competency categories of a project manager were Internal & External Communication, Project Management Body of Knowledge, and Inspirational Leadership. The analysis results of this research can be utilized in developing competency enhancement method for future project managers and as a basic data in developing an education program.

HID램프와 안정기 사이의 전선 길이에 따른 이그니션 전압 전달특성 분석 (Transmission Characteristics & Analysis of Ignition Voltage According to Its Conductor Length from the Ballast to the HID Lamp)

  • 방선배;김종민;한운기;임병노;장목순
    • 전기학회논문지P
    • /
    • 제56권3호
    • /
    • pp.148-154
    • /
    • 2007
  • In this paper, characteristics of ignition voltage and current by wire length of HID(High Intensity Discharge) lamp circuit are analyzed. In the construction field, decision of the wire thickness for HID lamp circuit has the problems, and these are presented. Through transmit parameters, equivalent model of the ballast and HID lamp circuit was derived. The graph of voltage reduction about length between the ballast and the lamp is shown. The simulation of proposed model and experimental results are presented in order to validate the proposed method. The proposed model and graph can use to choose the proper length of wire between the ballast and the lamp in the field.

A CONSTRUCTION OF COMMUTATIVE NILPOTENT SEMIGROUPS

  • Liu, Qiong;Wu, Tongsuo;Ye, Meng
    • 대한수학회보
    • /
    • 제50권3호
    • /
    • pp.801-809
    • /
    • 2013
  • In this paper, we construct nilpotent semigroups S such that $S^n=\{0\}$, $S^{n-1}{\neq}\{0\}$ and ${\Gamma}(S)$ is a refinement of the star graph $K_{1,n-3}$ with center $c$ together with finitely many or infinitely many end vertices adjacent to $c$, for each finite positive integer $n{\geq}5$. We also give counting formulae to calculate the number of the mutually non-isomorphic nilpotent semigroups when $n=5$, 6 and in finite cases.

지반 굴착에 따른 인접 프레임구조물의 손상평가에 관한 모형실험 연구 (Model Test for the Damage Assessment of Adjacent Frame Structures in Urban Excavation)

  • 김성철;황의석;김주철;김학문
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2005년도 춘계 학술발표회 논문집
    • /
    • pp.1490-1495
    • /
    • 2005
  • In this study, Model test of concrete frame structures with various shapes and locations are carried out by means of applying Peck's(1969) settlement method. The results of the model test indicated that important correlations existed between the behavior of frame structure and ground movement. Also, the damage level of frame structure closely influenced by the phase of excavation. Therefore, prediction of damage level at early phase of construction should be very precise. The damage level graph by Cording et al.(2001), the angular distortion provided gradually more serious damage to frame structures for the all cases. But the damage level graph by Burland(1997), was difficult to confirm because of very small amount of deflection ratio.

  • PDF

형식 도구를 이용한 이산사건 시뮬레이션의 모델 형식화 방법론 (A Model Formalization Methodology of Discrete Event Simulation with Formal Tools)

  • 정영식;황종선
    • 한국경영과학회지
    • /
    • 제17권3호
    • /
    • pp.79-99
    • /
    • 1992
  • The DEVS (Discrete Event system Specification) formal model for discrete event simulation is a hierarchical, modular model. Because the DEVS formal model has a mathematical structure, it provides a theoretic background of discrete event simulation model. However, the DEVS formal model is difficult to understand because of its mathematical structure. Also, since the DEVS formal model is often constructed by heuristic, subjective method of model designer from the model, a systematic model built-in methodology does not exist. In this paper, we propose the model formalization methodology from an informal model to the DEVS formal model. For this formalization methodology, we introduce formal tools for model construction based on the DEVS ( from an informal model : Event Dependency Graph (EDG) for the event analysis and State Representation Graph(SRG) for the system state analysis.

  • PDF

부양체 수중 위치제어에 관한 연구 (Study on the Position Control System of the Float Chamber using Air Control)

  • 허정규;김태호;양경욱
    • 유공압시스템학회:학술대회논문집
    • /
    • 유공압시스템학회 2010년도 춘계학술대회
    • /
    • pp.75-80
    • /
    • 2010
  • The paper is that study method to reduce bad influence that act to the floating fish cage by effect of environment in sea. Fish cage is controlled buoyancy using air control. According to marine environment, it is descend automatically to set-up depth and rise on the surface of the sea. The paper is the preceding research for a practical application. The fish cage simplified with the spherical float body. Then a control algorithm and a program developed by the experiment. And we did modelling by bond graph technique, and controlled by the practical reference model for PID control.

  • PDF

An Alternative Way of Constructing Ancestral Graphs Using Marker Allele Ages from Population Linkage Disequilibrium Information

  • Park, Lee-Young
    • Genomics & Informatics
    • /
    • 제7권1호
    • /
    • pp.1-12
    • /
    • 2009
  • An alternative way of constructing ancestral graphs, which is different from the coalescent-based approach, is proposed using population linkage disequilibrium (LD) data. The main difference from the existing method is the construction of the ancestral graphs based on variants instead of individual sequences. Therefore, the key of the proposed method is to use the order of allele ages in the graphs. Distinct from the previous age-estimation methods, allele ages are estimated from full haplotype information by examining the number of generations from the initial complete LD to the current decayed state for each two variants depending on the direction of LD decay between variants. Using a simple algorithmic procedure, an ancestral graph can be derived from the expected allele ages and current LD decay status. This method is different in many ways from previous methods, and, with further improvement, it might be a good replacement for the current approaches.

개최장소 추출을 위한 LGG의 구축 (Construction of LGG for Extracting Meeting Location)

  • 김경렬;최동현;김은경;최기선
    • 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
    • /
    • 한국정보과학회언어공학연구회 2011년도 제23회 한글 및 한국어 정보처리 학술대회
    • /
    • pp.49-54
    • /
    • 2011
  • 본 논문에서는 회의공지 이메일을 대상으로 하는 개최장소 추출시스템에 대하여 소개한다. 개최장소 추출 시스템은 두 단계로 구성되는데, 첫 번째 단계는 본문에 포함된 개최장소의 추출이고, 두 번째 단계는 추출된 개최장소의 Geocoding이다. 개최장소의 추출을 위하여 문맥 패턴을 분석하여 개최장소가 포함된 문장 주변의 패턴을 반영하는 Local-Grammar Graph를 구축하며, 개최장소의 Geocoding을 위하여는 Addr2Geocode API를 사용한다. 본 논문은 일정공지메일의 개최장소를 추출하기 위한 LGG 방법론 기반의 어휘-통사적 언어 정보를 기술하는 것을 목적으로 한다.

  • PDF

Simulation of Electric Vehicles Combining Structural and Functional Approaches

  • Silva, L.I.;Magallan, G.A.;De La Barrera, P.M.;De Angelo, C.H.;Garcia, G.O.
    • Journal of Electrical Engineering and Technology
    • /
    • 제9권3호
    • /
    • pp.848-858
    • /
    • 2014
  • In this paper the construction of a model that represents the behavior of an Electric Vehicle is described. Both the mechanical and the electric traction systems are represented using Multi-Bond Graph structural approach suited to model large scale physical systems. Then the model of the controllers, represented with a functional approach, is included giving rise to an integrated model which exploits the advantages of both approaches. Simulation and experimental results are aimed to illustrate the electromechanical interaction and to validate the proposal.