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다지점 오픈플로우 사이트들을 위한 자동화된 연동 도구의 설계 및 구현
나태흠(TaeHeum Na),김종원(JongWon Kim) 한국정보과학회 2015 정보과학회 컴퓨팅의 실제 논문지 Vol.21 No.1
미래형 서비스 실증을 위해서 실험자들에게 소프트웨어-정의 네트워킹(Software-Defined Networking: SDN)과 클라우드 컴퓨팅(Cloud Computing: CC) 기반으로 융합된 컴퓨팅/네트워킹 자원들을 유연하게 제공하는 통합된 시험/실증 환경의 중요성이 확산되고 있다. 이러한 추세에 맞춰서 OF@TEIN (OpenFlow @ Trans Eurasian Information Network) 시험/실증 환경에서는 국내외 다수 지역들에 가상화를 지원하는 융합형 자원인 SmartX Rack들을 설치하고 이들을 오픈플로우(OpenFlow) 기반의 SDN에 의해 연동하여 활용한다. 본 논문에서는 다지점에 설치된 오픈플로우 사이트들을 2계층 이더넷(Ethernet) 차원에서 연동할 때 원하는 토폴로지에 부합하도록 NVGRE(network virtualized generic route encapsulation) 터널링을 자동으로 설정하고 관제하는 관리도구를 소개한다. 제안한 관리 도구를 활용하면 운용자는 다수의 오픈플로우 사이트들간의 네트워크 연동을 신속하고 효율적으로 관리할 수 있고, 이와 동시에 실험자들은 원하는 가상화된 사용자 네트워크(virtual tenant network)를 최대한 자율적으로 구성하고 활용할 수 있다. To realize futuristic services with agility, the role of the experimental facility (i.e., testbed) based on integrated resources has become important, so that developers can flexibly utilize the dynamic provisioning power of software-defined networking and cloud computing. Following this trend, an OpenFlow-based SDN testbed environment, denoted as OF@TEIN, connects multiple sites with unique SmartX Racks (i.e., virtualization-enabled converged resources). In this paper, in order to automate the multi-point L2 (i.e., Ethernet) inter-connection of OpenFlow islands, we introduce an automated tool to configure the required Network Virtualization using Generic Routing Encapsulation (NVGRE) tunneling. With the proposed automation tool, the operators can efficiently and quickly manage network inter-connections among multiple OpenFlow sites, while letting developers to control their own traffic flows for service realization experiments.
나태흠,장요한,정지훈,김관주,Na, Taeheum,Jang, Yohan,Jeong, Jihoon,Kim, Kwanju 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.2
This study proposes an evaluation method for time delay function(TDF) of Point Detonation(PD) fuse using underwater explosion and water entry phenomena. Until now, nothing but the naked eyes of an observer or video images have been used to determine whether the TDF of PD fuze is operated or not. The observer has verified the performance of TDF by analysing the shape of the plume formed by underwater explosion. However, it is very difficult to evaluate the TDF of PD fuse by these conventional methods. In order to overcome this issue, we propose a method using underwater sound signal emitted from the underwater explosion of high explosive charge. The result shows that the measured sound signal is in accord with the physical phenomena of water entry of warhead as well as underwater explosion. Also, from the hypothesis test of bubble period, difference on underwater sound analysis between dud event and delay one is proved.
김재갑,김재훈,나태흠,김보균,박노석,Kim, Jaekab,Kim, Jaehoon,Na, Taeheum,Kim, Bokyun,Park, Noseok 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
In this paper, the integration of the firing test stages at the acceptance test of the propelling charge has been studied using statistical analysis on the basis of the test data of K676 and K677 propelling charge for K9 self propelled howitzer. Acceptance test of K676 / K677 propelling charge consists of 3 stages and each stage is charge assessment test, charge uniformity test and charge proving ground test. Many of rounds are fired and much money is spent to prove the charge performance at each stage. The result of t-test shows that there is no difference between charge uniformity and charge proving ground test stage of K676 and K677 propelling charge.
포 발사에 따른 쉘터 구조물의 차음 및 구조안전성 연구
이해석,허동은,박노석,나태흠,장요한,홍준희,Lee, HaeSuk,Heo, DongEun,Park, NoSeok,Na, TaeHeum,Jang, YoHan,Hong, JunHee 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.5
This paper describes the sound insulation and structural safety of the shelter which may be used for shooters. The noise level of the shelter should be less than 100 dB on the basis of the Industrial Safety and Act, the World Health Organization and the MIL-STD. The sound insulation design was designed for the shelter structure. The designed shelter performance was verified by the real measurement after completing the construction of the shelter. The system was also designed using the finite element method with data of sound pressure measured in the test. Its response was obtained numerically. It is proved that the shelter structure is sufficiently safe considering the calculated maximum stress level with the allowable stress of structural property.
대기 환경이 TDOA 기법의 위치 추정 정확도에 미치는 영향 분석
최동훈(Donghun Choi),고영주(Yeong-Ju Go),이재형(Jaehyung Lee),나태흠(Taeheum Na),최종수(Jong-Soo Choi) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
TDOA position estimate from acoustic measurement of artillery shell impact is studied in order to develop a targeting evaluation system. Impact position is calculated from the intersections of hyperbolic estimates based on the least square Taylor series method. The mathematical process of Taylor series estimation is known to be robust. However, the concern lays with the accuracy because it is sensitive to the bias caused by the randomness of measurement situation. The measurement error typically occurs from the distortion of waveform, change of travelling path, and sensor position error. For outdoor measurement, a consideration should be made on the atmospheric condition such as temperature and wind which can possibly change the trajectories of rays of sound. It produces wrong propagation time events accordingly. Ray tracing and optimization techniques are introduced in this study to minimize the bias induced by the ray of sound. The experiments were carried out in the football field with a sport start gun as an impact source. The array of sensors are deployed around the source and a weather monitored is positioned with it to acquire environmental information. The comparison of experimental result and numerical simulation shows that the atmospheric correction improves the estimation accuracy.