• Title/Summary/Keyword: Design standardization method

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A Study of th Optimum of closed ${CO}_{2}$ Gas Turbine Process for Nuclear Energy Power Plant(II) - For Optimal Design of Heat Exchanger- (원자력 발전소에 대한 밀폐 ${CO}_{2}$ 가스터빈 프로세스의 최적화 연구 (II) -열교환기의 설계에 관하여 -)

  • 이찬규;이종원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.1
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    • pp.251-258
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    • 1990
  • Optimal design of heat exchanger for closed CO$_{2}$ gas turbine plant of three processes selected from the result of cycle analysis have been discussed previously paper(I) has been carried out under specified inlet and outlet conditions. Independent variables such as number of parallel connection, tube diameter, shell side and tube side pressure loss as well as dependent variables such as shell diameter, number of tubes, number of serial connections were all characterized according to the standardization or so. Search method was used to construct a computer simulation together with the calculation of heat transfer rate by logarithmic mean temperature difference method. Strength analysis of major parts was carried to examine their dimensions satisfying heat transfer and pressure loss requirements.

Fundamental Study for Predicting Ship Resistance Performance Due to Changes in Water Temperature and Salinity in Korea Straits (대한해협에서의 수온 및 염도변화를 고려한 선박의 저항성능 예측을 위한 기초 연구)

  • Seok, Jun;Jin, Song-Han;Park, Jong-Chun;Shin, Myung-Soo;Kim, Sung-Yong
    • Journal of Ocean Engineering and Technology
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    • v.29 no.6
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    • pp.418-426
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    • 2015
  • Recently, shipping operators have been making efforts to reduce the fuel cost in various ways, such as trim optimization and bulb re-design. Furthermore, IMO restricts the hydro-dioxide emissions to the environment based on the EEDI (Energy Efficiency Design Index), EEOI (Energy Efficiency Operational Indicator), and SEEMP (Ship Energy Efficiency Management Plan). In particular, ship speed is one of the most important factors for calculating the EEDI, which is based on methods suggested by ITTC (International Towing Tank Conference) or ISO (International Standardization Organization). Many shipbuilding companies in Korea have carried out speed trials around the Korea Straits. However, the conditions for these speed trials have not been exactly the same as those for model tests. Therefore, a ship’s speed is corrected by measured environmental data such as the seawater temperature, density, wind, waves, swell, drift, and rudder angle to match the conditions of the model tests. In this study, fundamental research was performed to evaluate the ship resistance performance due to changes in the water temperature and salinity, comparing the ISO method and numerical simulation. A numerical simulation of a KCS (KRISO Container ship) with a free-surface was performed using the commercial software Star-CCM+ under three conditions that were assumed based on the water temperature and salinity data in the Korea Straits. In the simulation results, the resistance increased under low water temperature & high salinity conditions, and it decreased under high water temperature & low salinity conditions. In addition, the ISO method showed the same result as the simulation.

Trend Tracking Strategic System for Application on the Web Base on Town Watching (타운 워칭(Town Watching)에 의한 트렌드 트래킹 시스템과 활용에 관한 연구)

  • 한석우;김정진
    • Archives of design research
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    • v.13 no.4
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    • pp.225-231
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    • 2000
  • Forcasting the future is a very important task in design situation analysis. To do this, the reduction of life style, the tendency of product differentiation and individuality should be considered along with such changes as cultural, economical and social trends. At the moment, industrial structure is being reorganized from centering around the manufacturing industry to the distribution industry and consumers. Consumers show the attitude of expressing their individualities on the basis of various tastes rather than standardization. The flow of information also has been changing rapidly from the former types of information provided by producers to the age when consumers pursue the objective and model of information. Therefore, we are able to say that picking up the trends around the streets becomes more important than ever. Accordingly, the objective of this study is to establish a system which is able to effectively carry out the trend analysis by a town watching method, the construction of a database with collected data, and its practical application on the web.

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A study on the application of on-line card game Avatar (온라인 카드게임 아바타 활용에 관한 연구)

  • Lee, Mi-Young
    • Archives of design research
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    • v.18 no.2 s.60
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    • pp.133-142
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    • 2005
  • Recently, on-line users prefer image and sense that are deviated from standardization pattern. Also, they need instant and mutual exchangeable communication forms. Developing the various Avatars is required to apply it to various situations. It is due to that the Avatar is used as a card in the on-line communication to represent the user's character visually. The Avatar in the on-line game, such as poker or go-stop which are the most popular nowadays, does not have different character from general community site. Therefore, it dose not satisfy owner who needs sensitive and various character of the Avatar. In this paper, we will be analysis the card game Avatar service, character and desire of the user in existing game petal sites. Also, we'll provide service method which can satisfy the user's requirements. For this, we survey recognition and design preference of users on the card game Avatar.

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Design Plan of Secure IoT System based Common Criteria (CC 기반의 안전한 IoT 시스템 설계 방안)

  • Kim, Ju-Hun;Jung, Hyun-Mi;Cho, Han-Jin
    • Journal of the Korea Convergence Society
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    • v.8 no.10
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    • pp.61-66
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    • 2017
  • Recently, IoT technology is rapidly developing with the keyword "Anytime, Anywhere, Convenient". In addition, security problems in IoT systems are exploding and the damage is increasing as well. In this paper, we propose a method to develop IoT system safely by using internationally recognized CC evaluation in ICT by identifying the standardization and security technology development status defining IoT system security requirements. For this purpose, IoT system and service security aspects are analyzed. Based on this, it is possible to design the security functional requirements and to demonstrate the rationale of the security objective through the correspondence relation, and it is possible to design the protection profile for the IoT system. This is a sufficient basis for the development methodology to be presented in this paper because it is used as a means of referring to the set of security requirements of administrators, developers, and users.

Development of Functional Products Using Chamaecyparis Obtusa Heartwood Essential Oil (편백심재오일을 이용한 기능성 제품 개발)

  • Choi, Ju-Hyeon;Park, Jeong-Hyeon;Cho, Yun-Jin
    • Journal of Convergence for Information Technology
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    • v.11 no.2
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    • pp.211-218
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    • 2021
  • The purpose of this study is to develop how to extract essential oil from heartwood of chamaecyparis obtusa and commercialize eco-friendly products using essential oil. Manufacturing process consisted of 8 steps: pulverization, input, pretreatment, extraction(steam distillation), steam emission, cooling, separation, aging. Through the method developed in this study, chamaecyparis obtusa oil with excellent quality in antibacterial effect can be extracted with high productivity. Also, chamaecyparis obtusa spray using this oil had good antibacterial and deodorant effects, and got no irritation results in the clinical test. To commercialize spray, we built a commercial website and performed consumer survey on the site. The survey results showed that respondents had positive attitude toward the products and their messages in the site. When the production standardization through precise quality control and the optimization of composition ratio are accomplished, this study will contribute to commercialize various types of cosmetics and quasi-drugs.

A Mechanism to Provide Telepresence Service Information to Heterogeneous Services (이종 서비스에 텔레프레즌스 서비스 정보 제공 방법)

  • Lee, Yunjin;Kim, Younghan;Choi, Sunwan
    • Journal of KIISE
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    • v.42 no.1
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    • pp.122-129
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    • 2015
  • This paper proposes a method for providing the information about multimedia streams for telepresence services to heterogeneous services such as IMS (IP Multimedia Subsystem) and RTCWeb (Real-Time Communication in WEB-browsers). First of all, we design an interworking gateway for each service and suggest a procedure for providing the information about multimedia streams, which is defined by CLUE, a working group for standardization, to the heterogeneous services. We also apply the method of the actual CLUE information exchange and implement it in our experiment environment. Finally, we show that the proposed method can exchange more information than previous methods even though the media session re-establishment time is similar to legacy systems in terms of performance analysis. With the proposed method, the heterogeneous services can collect a variety of information about the telepresence service and use it according to user preference. In this way it provides rich multimedia streaming services for many areas.

Implementation and Design of Objective Quality Assurance System for Multimedia Service Video (멀티미디어 서비스 영상의 객관적 품질측정 시스템 설계 및 구현)

  • Joo, Hae-Jong;Hong, Bong-Hwa;On, Jin-Oh;Hong, Suk-Ju
    • 전자공학회논문지 IE
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    • v.45 no.1
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    • pp.58-64
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    • 2008
  • This Paper provides perceptual metrics for video quality based on properties of human visual system, and audio quality based on human audition. All metrics work without reference signals, allowing non-intrusive, in-service measurements. A simple and easy-to-learn user interface displays the metrics and saves them in popular file formats like CSV. In this paper, proposed method was able to various and corrective measurement for the multimedia service video quality. As that it was able to application to set up service guide line and the methode of measurement and system for the set up standardization of the high quality video service.

A Study on the Shroud, according to Change of Mourning & Funeral Custom (상장례문화의 변화에 따른 수의연구)

  • 이민주
    • The Research Journal of the Costume Culture
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    • v.8 no.6
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    • pp.887-898
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    • 2000
  • Mourning & funeral ritual means a various kinds of ritual procedures which begins at the time of death, buried and created a graveyard, a manner of wearing funeral garment being mourning the death, finally go back to everyday life. Our mourning & funeral custom was burial at first time. After going through the era of the Three kingdoms, The unified Shilla and Korea dynasty, cremation method has been prevailed. However, based on Chu-tzu celebration in Chosun dynasty, the burial custom has been widely spread again. Nowadays, due to effective land utilization issue, excessive cost for burial and the change of thinking for cremation, the cremation is recognized as remedy of righteous funeral system. At this point, a shroud following existing burial custom burdens considerably for quality, price, size and design of it. Accordingly, it needs anew style of shroud corresponding to cremation system. As an alternative, the shroud is required simplification and standardization ; Firstly, in size, a shroud should be larger than plain clothes and differentiated in small, medium and large. Secondly, the material of a shroud would be white cotton, which can keep from pollution during burning time. Thirdly, it unifies the item. In case of man, 바지(把特, those are trousers), 저고리(赤古里, Korean-style jacket) and Durumagi(周衣, Korean topcoat). In case of woman, 치마(赤 , those are skirt), 저고리(赤古里, Koran-style jacket) and Durumagi(周衣, Korean topcoat).

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A Study on the Performance Improvement of Asynchronous W-CDMA System (비동기 W-CDMA 시스템의 성능 개선에 관한 연구)

  • 우병훈;소준영;강희조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.6
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    • pp.853-864
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    • 2001
  • In this paper, system model is based on proposed standardization by 3GPP(Asynchronous IMT-2070 system), and we have analyzed the performance of the DS-CDMA/QPSK which cancelled self-interference, so that occurs when the received signal time is delay by multipath fading. We proposed the new scheme that designed for self-interference cancellation and the system performance is calculated in Rician fading and Rayleigh fading channel. The proposed rake receiver can be achieved a gain of about 1 [dB]∼6 [dB] more than generally rake receiver, and will be a very effective method to improve the performance of IMT-2000, and these data can be available for modem design of DS-CDMA.

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