• 한국정보전자통신기술학회논문지
• /
• 제7권3호
• /
• pp.137-141
• /
• 2014

RFID 시스템은 공정관리, 물류관리, 고객관리, 출입통제, 환경 센싱, 개체식별 등 다양한 산업에 적용되고 있다. 그러나 무선통신을 이용하기 때문에 보안성이 매우 취약하다. 본 논문에서는 태그와 리더기 사이의 기본 보안사항인 인증에 대한 프로토콜을 제안한다. 제안 프로토콜은 유한체 위의 이변수 다항식을 이용하여 도청공격, 재전송공격, 위치추적, 트래픽분석에 대해서 안전함을 보인다.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2011년도 후기공동학술대회 논문집
• /
• pp.39-40
• /
• 2011

The 62nd session of the MARINE Environment Protection Committee was held in London from 11 to 15 July 2011. Mandatory measures to reduce emissions of greenhouse gases (GHGs) from international shipping were adopted at the Committee. The amendment to MARPOL Annex VI includes a new chapter 4 to make mandatory the Energy Efficiency Design Index (EEDI) for new ships and the Ship Energy Efficiency Management Plan (SEEMP) for all ships. This first mandatory measures on energy efficiency will enter into force on 1 January 2013. This amendment to MARPOL Annex VI will significantly influences the vast majority of the international maritime community. This paper mainly discusses the main results of MEPC 62nd session including the recent Emission Control Area.

• 한국BIM학회 논문집
• /
• 제12권1호
• /
• pp.10-22
• /
• 2022

Prefabricated bridges require strict management of tolerance during fabrication and assembly. In this paper, digital engineering models for prefabricated bridge components such as deck, girder, pier, abutment are suggested to support information delivery through the life-cycle of the bridge. Rule-based modeling is used to define geometry of the members considering variable dimensions due to fabrication and assembly error. DfMA(design for manufacturing and assembly) provides the rules for ease of fabrication and assembly. The digital engineering model consists of geometry, constraints and corresponding parameters for each phase. Alignment and control points are defined to manage tolerances of the prefabricated bridge during fabrication and assembly. Quality control by digital measurement of dimensions was also considered in the model definition. A pilot bridge was defined virtually to validate the suggested digital engineering models. The digital engineering models for DfMA showed excellent potential to realize prefabricated bridges.

• Advances in aircraft and spacecraft science
• /
• 제10권4호
• /
• pp.369-391
• /
• 2023

In our research we have offered a solid solution for aeronautical analysis. which can guarantee the asymptotic stability of coupled nonlinear facilities. According to the theoretical solutions and methods presented, the engine of this aircraft is a small high-bypass turbofan engine. using the non-linear aero-motor control approach and this paper focuses on the power management function of the aero-motor control system. These include static controls and transient controls. A mathematical model of the high-bypass-ratio two-spool unmixed-flow aeroengine was developed through a set of nonlinear dynamic equations verified by experimental data. A single actuator using the displacement method is designed to maintain a certain level of thrust under steady-state conditions. and maintains repeatable performance during transient operation from the requested thrust phase to the next. A single controller can compensate for the effects of noise and harmonic noise at many performance points. And the dynamic performance of a single controller is satisfactory during the transient. for fairness Numerical and computer experiments are described in the perfection of the methods we offer in research.

• 산업공학
• /
• 제24권2호
• /
• pp.128-138
• /
• 2011

This research proposes a resource allocation model of Data QC (Quality Control) activities using COQ (Cost of Quality). The model has been developed based on a series of research efforts such as COQ classifications, weight determination of Data QC activities, and an aggregation approach between COQ and Data QC activities. In the first stage of this research, COQ was divided into the four typical classifications (prevention costs, appraisal costs, internal failure costs and external failure costs) through the opinions from five professionals in Data QC. In the second stage, the weights of Data QC activities were elicited from the field professionals. An aggregation model between COQ and Data QC activities has been then proposed to help the practitioners make a resource allocation strategy. DEA (Data Envelopment Analysis) was utilized for locating efficient decision points. The proposed resource allocation model has been validated using the case of Korea national defense information system. This research is unique in that it applies the concept of COQ to the data management for the first time and that it demonstrates a possible contribution to a real world case for budget allocation of national defense information.

• 한국식품조리과학회지
• /
• 제19권5호
• /
• pp.647-658
• /
• 2003

Foodservice at elementary schools has been provided nation-wide. It is predictable that foodborne diseases would increase continuously. Formation of a counterplan is urgently needed. This study was designed to identify the stage which contains the critical control points (CCPs) for the microbiological management of HACCP (Hazard Analysis Critical Control Point) at the foodservice provided at elementary schools. Foodservice places at four elementary schools in Seoul were sampled and the overall hygiene of cooking, utensils and equipment, employees, and environment by season were examined. The results showed that the number of bacteria in overall samples was increased and that E. coli, Salmonella and Staphylococcus by biochemical test emerged in more diverse samples in summer than in spring. Particularly, the number of aerial bacteria in summer was three-fold greater than that in either spring or winter. E. coli 0157 was not detected, although Salmonella was identified by PCR analysis in the meat knives, chopping boards, waste bins and meat dish at elementary school foodservice. According to this data, cross-contamination should be managed in the stage of mixing up the ingredients with improper equipments and insanitary treatments. Thus, the establishment of SSOP (Sanitation Standard Operating Procedures) and GMP (Good Manufacturing Practice) at elementary school foodservice is stringently required, along with sanitation education for workers and employees as CCPs.

• 품질경영학회지
• /
• 제49권4호
• /
• pp.527-537
• /
• 2021

Purpose: The purpose of this study was to suggest an improved version of Proof-of-Nonce (PoN) algorithm, which is a distributed consensus algorithm used for block chain system. Methods: First, we used response surface method for design of experiment that is to generate experimental points considering non-linear relationship among variables. Then, we employed overlapped contour plots for visualizing the impact of control variables to performance target. Results: First, we modified the consensus procedure of the existing PoN algorithm by diminishing the content of the exchanged message. Then, we verified the performance improvement of the new PoN algorithm by performing a numerical experiment and paired t-test. Finally, we established new regression models for consensus time and Transactions per second (TPS) and proposed a method for optimizing control variables for obtaining performance target. Conclusion: We could improve the performance of the previous version of PoN algorithm by modifying the content of the exchanged message during 4-steps of consensus procedure, which might be a stepping stone for designing an efficient and effective consensus algorithm for blockchain system with dynamic operation environment.

• 한국건설관리학회논문집
• /
• 제4권4호
• /
• pp.69-79
• /
• 2003

국내 부동산 건설기업 중 2001년 말 현재 등록된 업체 중 약 93$\%$가 5억원 이하(적자 기업 포함)의 당기순이 익을 나타내고 있는 실정이다. 과거 10여년간의 매출원가 율과 매출원가 구성비율을 분석한 결과 매출원가 구성비에 큰 변화가 있었음을 발견하였다. 재료비, 노무비는 점차 감소하였고 외주가공비는 크게 증가하였다. 원가통제의 기본이 되는 활동점을 찾기 위해 공종별 신활동기준 원가관리를 모색하였다 부동산 건설업의 특징이 수주금액(판매금액)이 확정되어 있고 원가사용에 따라 이익 규모가 달라진다. 확정된 수주금액에서 최대의 이익을 창출하고, 새로운 원가관리 방법을 찾아 지속적인 경영혁신을 이루어야 할 시점이다. 공종별 신활동기준 원가관리는 부동산 건설업의 생존경영을 위한 관리혁신으로 생각된다. 실행예산과 경영원가 통제는 같은 대상을 놓고 서로 다른 관점에서 일정과 비용을 통제한다. 실행예산은 구체적인 활동 중심으로 집행되고, 경영원가는 지출내역인 재료비, 노무비, 외주비, 경비의 형태로 통제된다. 공종별 신활동기준 원가관리 방법을 이용하여 실행하기 위해서는 우선 활동의 동인이 무엇인가? 그 활동이 얼마만큼의 부가가치 창출을 하는지 사전에 분석되어 실행해야 한다. 부동산 건설업의 공종별 신활동기준 원가관리 기법은 부동산 건설업의 생존경영에 꼭 필요한 원가 관리 방법으로 지속적인 연구가 필요하다고 생각된다.

• 인터넷정보학회논문지
• /
• 제7권6호
• /
• pp.21-40
• /
• 2006

지식 기반 사회가 구축되면서 처리해야 할 업무 프로세스의 규모가 커지고 분석할 정보의 양이 증가함으로 인해 프로세스 관리와 개선에 대한 필요성이 높아지고 있다. 본 논문에서는 비즈니스 프로세스 관리를 위해 프로세스 수행에 필요한 명확한 규칙과 정의를 관리하는 룰 에이전트를 적용하여 프로세스의 정확한 수행을 가능하게 하고 일정관리 에이전트를 적용하여 프로세스 수행에 투입된 개개인의 일정을 정확하게 측정하고 관리할 수 있도록 했다. 에이전트를 적용한 프로세스 관리 모델은 조직 차원에서 비즈니스 프로세스의 자동화와 프로세스 중복 제거를 통한 프로세스의 통제성, 유연성, 민첩성, 신뢰성, 재사용성을 높이고 개인 차원에서는 개인의 프로세스 역량을 측정하고 프로세스 개선점을 식별하여 개선할 수 있도록 설계 및 구현하였다.

• 한국조리학회지
• /
• 제23권6호
• /
• pp.20-26
• /
• 2017

To guarantee the safety of rice cake production, the Hazard Analysis Critical Control Points system was applied to the production process. The purpose of this study was to analyze the microbiological hazards of the manufacture of rice cakes, and establish critical limits in the process of the manufacturing rice cakes. To control the microbiological hazards, the sterilization process was set to a critical limit. The process of manufacturing rice cakes can reduce these microbiological hazards during the steaming process. A microorganism test for each specimen was conducted three times and compared with before and after steaming processes. The finished product was conducted by microbiology experiment and the validity of the steaming process was verified. The results were determined to be capable of reducing the biological element of Critical Control Point via the steaming process. Microbiology such as aerobic plate count, coliform, Escherichia coli(E. coli), Listeria monocytogenes, Enterohemorrhagic E. coli, Salmonella spp., Bacillus cereus, Staphylococcus aureus and Clostridium perfringens was evaluated by the experimental method of Korean Food Standards Codex. Aerobic plate count was reduced by steaming process, and no microorganism were detected. All rice cakes in the finished product were judged to be safe for both the Escherichia coli and general bacteria. In conclusion, it suggested that a HACCP plan was necessary for management standard and systematic approach in the establishment of critical limit, problem resolution, verification method, education, and records management. Based on this study, it is intended to provide a baseline for improving quality control standards and improving hygiene levels for small manufacturers.