As the human demand or desire on brand new systems otherwise equipped with new functions grows drastically, so does the complexity of the systems. With this trend, the systems are becoming bigger in scale and at the same time the safety requirements are more stringent in the development. Typical systems examples in such a situation may include high-speed railway systems, aero and space systems, marine systems, etc. Failure of those systems can cause serious damages on both the human being and wealth with social infrastructure. As such, it is quite necessary to ensure that the safety requirements be satisfied in the system development. To achieve this need, there could be a lot of solutions to take. In this paper, regarding safety, a special attention is given to the verification phase process, which is one of the intermediate phases of whole systems development process. More specifically, the ultimate concern is placed on how to carry out the design verification while ensuring the safety requirements. To do so, some improvements in the verification phase were proposed first. Then, the outcomes were combined with the systems safety process by generating an integrated process model to reach the goal. As a case study, application to a railway system was discussed, where strict safety requirements are usually necessary. It would be expected that the potential likelihood of failure with rail systems could be reduced if the results obtained are used effectively with some enhancement from further study.

Smart work는 정보통신기술을 이용하여 시간과 공간의 제약 없이 언제, 어디서든 근로자가 업무를 수행할 수 있는 유연한 근무형태를 의미한다. 스마트워크의 유형에는 모바일 오피스, 홈 오피스, 센터근무, 원격협업으로 분류할 수 있다. 태블릿PC나 스마트폰을 이용한 스마트워크 방식을 모바일 오피스라고 하며, 이동통신망과 휴대 단말기를 이용한 서비스를 제공하는 방식이다. 모바일 오피스는 무선환경과 스마트기기를 이용하여 움직이는 사무실을 구현하는 것으로 언제, 어디서나 사내 시스템에 접속하여 정보 검색은 물론 결재, 승인 등의 업무를 수행할 수 있다. 이러한 모바일 오피스 시스템을 조선소에 적용한다면, 실시간 처리로 근로자들의 생산성과 업무 효율성을 향상 시킬 수 있다. 따라서 본 연구는 조선업을 위한 HSE관리 모바일 어플리케이션 개발을 위해 기능을 추출하고 설계하는 것이 목적이다. 모바일용 HSE 관리 어플리케이션을 개발하기 위해 10개의 기능들을 추출하였고, ooCBD 방법론을 이용하여 설계하였다.

The issues raised so far in the development of safety-critical systems have centered on how effectively the safety requirements are met in systems design. The systems are becoming more complex due to the increasing demand on the functionality and performance. As such, the integration of both the systems design and systems safety processes becomes more important and at the same time quite difficult to carry out. In this paper, an approach to solving the problem is presented, which is based on an integrated data model. To do so, the data generated from the inputs and outputs of the systems design and systems safety processes are analyzed first. The results of analysis are used to extract common attributes among the data, thereby making it possible to define classes. The classes then become the cores of the interface data model through which the interaction between the two processes under study can be modeled and interpreted. The approach taken has also been applied in a design case to demonstrate its value. It is expected that the results of the study could play a role of the stepping stone in extending to the architecture development of the integrated process.

본 연구에서는 화력발전소에서 온배수의 형태로 배출되는 폐열을 히트펌프의 열원으로 이용하여 온실의 난방에 활용할 수 있는 히트펌프 시스템을 설계 제작하였으며, 난방 성능을 분석하여 PE 파이프 열교환기의 설계기준을 제시하고자 하였다. PE 파이프 열교환기의 내경은 20mm, 두께는 2mm였으며, Roll의 직경은 1,000mm로 하였다. 연구결과 PE파이프 열교환기의 적정 길이는 1.0RT당 75m로 설계하는 것이 바람직할 것으로 판단되었으며, 이때 히트펌프시스템의 난방성능계수(COPh)는 3.8로 나타났다.

소프트웨어 기반의 시스템 설계과정에서 설계자가 고려해야 하는 요소들이 다양해지면서 시스템 설계가 점점 어려워지고 있다. 다양한 설계 요소들이 존재하지만 사용자의 특성 및 직무, 사용가능한 정보기술의 특성 등이 핵심적인 요소로 간주된다. 또한 정보기술이 발달하면서 인간과 시스템의 상호작용이 점점 인지적인 특징을 지니게 되었다. 따라서 사용성 높고, 효율적이면서 안전한 소프트웨어 기반의 시스템을 개발하기 위해서는 시스템 설계자가 사용자의 인지적인 요구사항

This study proposes an integrated approach that uses both a fuzzy service FMEA (failure mode and effect analysis) and HOQ(house of quality) matrix algebra in designing and improving a service system. The fuzzy service FMEA methodology applies the customer

Recently, we have witnessed the definitely negative impacts of large-scale accidents happened in such areas as atomic power plants and high-speed train systems, which result in increased fear for the potential danger. The problems appear to arise due to the deficiency in the design of large-scale complex systems. One of the causes can be attributed to the design process that does not fully reflect the safety requirements in the early stage of the system development because of the substantially increased complexity. In this paper, to enhance the systems safety an integrated process is studied, which considers simultaneously both the system design process and system safety process from the beginning of the system development. In the conceptual system design phase an integrated process model is constructed by analyzing the activities of both the system design and safety processes. As a case study example, an inner city train system is described with the application of the developed process. The computer simulation of the example case is followed by the result discussed. The results obtained in the paper are expected to be the basis for the future study where a detailed process and its associated activities can be developed.

This paper is the product development of environment and safety. In growing society, the bicycle is need to have a common goals for consumers convenience and theft prevention. The bicycle is movable means. But as times passed, that bicycle is strongly recommended to replace other vehicles because that is not produced to air pollution and energy(gas, diesel etc) insufficiency. As workers using a bicycle are increased, road for only bicycle is made by additionary. The bicycles happens to several moving accidents such as car accidents because of signal mismatch between bicycle users. However, using the development products of this paper, many accident problems for bicycle can be solved. As increasing of bicycles numbers, the high cost bicycles are too increased. So, the more theft of bicycle is also happened. The developed products(turn signal system and theft prevention system) through this study kept your bicycles from more convenience and more safe.

In this study, voltammetry system for realizing high sensitivity nano-labeled sensor of detecting heavy metals was designed, and optimal system operating conditions were determined. High precision digital to analog converter (DAC) circuit was designed to control applied unit voltage at working electrode and analog to digital converter (ADC) circuit was designed to measure the current range of at counter electrode. Main control unit (MCU) circuit for controlling voltammetry system with 150 MHz clock speed, main memory circuit for the mathematical operation processing of the measured current value and independent power circuit for analog/digital circuit parts to reduce various noise were designed. From result of voltammetry system operation, oxidation current peaks which are proportional to the concentrations of Zn, Cd and Pb ions were found at each oxidation potential with high precision.

화상영어회화시스템은 원격으로 원어민과 직접 영어회화를 가능하게 함으로써 일반적으로 사용되고 있다. 그러나 어린 학습자는 게임 기술을 활용하여 학습의 흥미와 교육의 효과를 얻을 수 있다. 본 논문은 3차원 게임 기술과 네트워크 게임 기술을 이용해서 저연령의 학습자가 교육에 몰입할 수 있도록 하는 3차원캐릭터 화상영어회화시스템의 설계와 구현에 대해서 기술한다. 3차원캐릭터 화상영어회화시스템은 게임과 교육이 결합한 좋은 예가 될 것이며, 향후 성공적인 교육용 기능성 게임의 적극적인 개발을 기대한다.

오늘날, 스마트폰의 보급으로 무선 헬스케어시스템에 대한 연구가 점차 활성화됨에 따라, 손쉽고 간편한 건강관리 시스템에 대한 수요도 증가하고 있다. 그 중에서도 사회문제로 크게 대두되는 독거노인의 고독사 방지를 위한 시스템 개발은 지속적으로 연구되고 있다. 본 논문에서는, 인체에 비침습적이며 무구속으로 생체 신호 계측이 가능한 광용적맥파법(photoplethysmography)으로 독거노인의 맥파를 계측하고 스마트 폰으로 전송하여, 원격진단이 가능한 감시시스템 개발을 목적으로 하였다. 광용적맥파법은 적색광이나 적외선광을 피부에 침투시켜 맥파를 검출하는 방법의 하나로 근래에는 손가락과 같은 인체 말단뿐만이 아니라 손목에서 맥파를 계측하는 연구가 진행되고 있다. 그러나 손목에서 맥파를 계측 시, 광량을 고정시킨 상태에서는 모세혈관의 회전이나 피부의 두께 등에 따라 정확한 맥파 검출을 하기에는 어려움이 있다. 따라서 본 연구에서는 잡음제거에 탁월하며 높은 이득을 가지는 차동 증폭기를 단일전원에서도 동작 가능하도록 개선하고, 인체의 피부 두께에 따른 오차를 줄이기 위해 광량의 침투 범위를 조절하여 다양한 피부 층에서 최적의 센싱을 할 수 있는 알고리즘을 설계하고 그 타당성을 확인하였다.

The interest for the stability of the structures against earthquake, which is increasing recently, is rapidly increasing. But, currently, school buildings among the reinforced concrete(RC) structures in Korea are not designed with seismic design or there are many cases of being designed with the old seismic design code, so it is estimated to have not only lives but also a great deal of economic damage are likely to occur when an earthquake occurs. In this study, proposed horizontal friction system(HFS) with rotary friction damper installed as a method to reinforce strength and hardness and to increase ductility for the low story structure of 5 stories or lower such as school buildings. For the seismic retrofitting design with horizontal friction system in which rotary friction damper is installed, Peak displacement response ratio according to elastic and inelastic behavior and ductility demand is calculated to decide elastic stiffness and strength of the HFS, design model and procedure to decide the capacity of HFS thereof is decided, and the feasibility and performance are reviewed through pushover analysis.

Recent projects for transferring Public Office buildings and estimation of appropriate construction expense are highly important for both government and construction firms. Moreover, estimation and management of construction expense can be regarded as extremely important duties for effective execution of a national budget as nation’s finance is invested in the Public office building projects progressed by the government. To progress one project for Public office building, not only the organization demanding the project but also an investment screening organization, a budget-managing organization, a feasibility assessment institution and many other related organizations participate in the project and a lot of decisions arisen from the project operation are made on the basis of construction expenses calculated for relevant stages. And estimation of rational construction expense is also critical for designers in order to create design within the fixed budget simultaneously with securing the quality and efficiency of structures to the maximum. Therefore this research suggested an improvement process to analyze problems in current construction expense management process and to administer the construction expenses effectively.

Various computer-based simulation tools such as 3D-CAD and CAE systems are widely used to design automotive body structure at the early phase of design. Designers must search the optimal solution that satisfies a number of performance requirements by usin