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다중 로봇 SLAM을 위한 스펙트럼 기반 PSO를 이용한 격자 지도 병합
이헌철 대한전기학회 2022 전기학회논문지 Vol.71 No.5
This paper addresses the problem of grid map merging for multi-robot SLAM(simultaneous localization and mapping) with LiDAR(light detection and ranging). The problem becomes highly challenging if inter-robot observations, common landmarks, and the knowledge of initial relative poses are not available in the multi-robot SLAM system. This paper proposes an accurate grid map merging method with spectra-based particle swarm optimization (PSO) to solve the problem. Experimental results show that the proposed method can be conducted successfully and acquire a more accurate merged map than the existing methods.
MIL-STD-1553B 통신에서 샘플링 기반 최적화 기법을 이용한 효율적 임무 자료 전송
이헌철,김기표,권용성,Lee, Heoncheol,Kim, Kipyo,Kwon, Yongsung 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.3
The mission data in missile systems should be quickly and reliably transmitted from a mission transmission device to a guidance control unit. The MIL-STD-1553B is one of the reliable communication standards, but its bit rate is generally limited to 1Mbps due to the intrinsic properties of its electrical design. Therefore, the bus controller needs to be optimized to efficiently transmit the mission data on the inevitably limited bit rate. This paper proposes an analytical approach based on sampling-based optimization methods to maximize the data throughput without data loss. The proposed approach was evaluated in the simulations with the data transmission model for the MIL-STD-1553B communication system. The results of the proposed methods were applied to a real-time system and showed that the proposed method was successfully performed.
안전조치 포함 다단계 임무 수행을 위한 선택적 스퀴브 도화 및점검 회로 설계
이헌철,권용성 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.5
The mission in missile systems can be conducted with multiple phases according to the characteristics of the systems and the targets. The safeguarded multi-phase mission includes a safeguarded phase before launch for considering the safety of operators in unexpected squib activation. However, the safeguard function should be disabled after launch to complete the mission. Therefore, the squib system needs to be selectively activated according to the phases. This paper presents a selective squib activation and check circuit design for safeguarded multi-phase missions in missile systems. The presented circuit design was implemented with various electronic components including a field-programmable gate array(FPGA). Its functions and performance were validated by both many ground tests and several flight tests.
經營情報시스템(MIS)의 事例硏究에 따른 科學的 硏究方法論에 대한 考察
徐正大,李憲哲 釜山工業大學校 1991 論文集 Vol.33 No.-
A methodology for conducting the case stydy of a managemment information sustem (MIS) is presented. Suitable for the study of a single case, the methodology also satisfies the standards of the natural science model of scientific research. This article provides an overview of the methodological problems involved in the study of single case, describes scientific method, presents an elucidation of how a previously published MIS case study captures the major features of scientific method, responds to the problems involved in the study of a single case, and summarizes what a scientific methodology for MIS case studies does, and does not, involve. The article also has ramifications that go beyond matters of MIS case studies alone. For MIS researchers, the article might prove interesting for addressing such fundamental issues as whether MIS research must be mathematical, statistical, or quantitative in dorder to be called "scientific." For MIS practitioners, the article's view of scientific method might prove interesting for empowering them to identify, for themselves, the point at which scientific rigor is achieved in an MIS research effort, and beyond which further rigor can be called into question, especially if pursued at the expense of professional relevance.
연구논문(硏究論文) : 온라인 오픈마켓의 고객만족 영향요인에 관한 연구
이헌철 ( Heon Cheol Lee ),권해익 ( Hae Ik Kwon ),권장기 ( Jang Kee Kwon ) 한국세무회계학회 2010 세무회계연구 Vol.0 No.27
본 연구의 주요한 목적은 기존 연구에서 나타난 오픈마켓의 고객만족 요인을 체계적으로 분석해 보고 최근의 Web2.0의 패러다임에 따라 중요한 화두로 등장한 오픈마켓의 고객만족 요인들을 실증적으로 규명하는 것이다. 오픈마켓의 고객만족 영향요인이 오픈마켓의 고객만족에 미치는 영향을 분석키 위해 요인 분석을 통해 추출된 요인을 독립 변수로, 오픈마켓의 고객만족을 종속 변수로 설정, 다중회 귀분석을 실시한 결과 쇼핑의 효율성의 경로계수가 0.438, t = 7.828, p < 0.000, 거래안정성의 경로계수는 0.281, t = 5.018, p < 0.000, 주문용이성의 경로계수는 0.239, t = 4.274, p < 0.000, 개인정보보호 경로계수는 0.235, t = 4.201, p < 0.000, 검색편의성의 경로계수는 0.223, t = 3.991, p < 0.000, 의사결정지원의 경로계수가 0.171, t=3.064, p=0.003, 배송 및 A/S 편의성의 경로계수가 0.104, t=1.863, p=0.064 등의 순으로 분석되었다. 본 연구의 실증분석 결과에 근거, 실무적 관점에서 몇 가지 중요한 시사점을 정리, 제시하면 첫째, 오픈마켓은 종합몰에 비해 여러 판매자와 구매자가 동시에 상거래를 하는 장소이기에 무엇보다도 거래되는 제품과 개인정보처리에 대한 신뢰성, 해당 쇼핑몰 업체의 평판 등이 확보되어야 한다. 둘째, 소비자의 오픈마켓에서의 구매행동이 무엇보다도 편리함을 추구하고 있는 추세를 반영하여, 다양한 상품군을 구비하고 있는 오픈마켓의 경우 빠른 주문 처리와 취소편리, 대금결제의 편리성이 무엇보다도 소비자만족도에 있어서 중요하다고 할 수 있으므로 이에 대한 지속적인 관리가 필요하다고 보여 진다. The main purpose of this study is to provide an important suggestion in order to establish competition strategy for the open market businesses and to intend to build a new one through the analysis of success factors of open market emerging as a new paradigm of the Internet shopping business. First, this study suggested independent variables and dependant variable based on existing studies related to open market and made study model. Then, we analyzed the effects of main success factors of open market which are service factor, trust factor, the effectiveness of shopping, support of decision-making on the customer satisfaction of open market. 250 undergraduates on Department of Business Administration in Dae-gu took part in this survey for 10 days from 4. 26. 2010 and Actually, 189 proper questionnaires were used in the analysis except some inappropriate questionnaires. To sum up the analysis result, it was found that search convenience, easy to order, delivery and A/S ease, transaction safety, personal data protection, shopping efficiency, decision support had a significant effect on the open market success. that is, the better cost saving effect, decision making, the convenience of order and A/S and transaction safety are the more satisfied consumers are with the shopping through open market when they shop through open market.