ADVANCED DVI+

Kwon, Tae-Soon,Lee, S.T.,Euh, D.J.,Chu, I.C.,Youn, Y.J. Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.7

A new advanced safety feature of DVI+ (Direct Vessel Injection Plus) for the APR+ (Advanced Power Reactor Plus), to mitigate the ECC (Emergency Core Cooling) bypass fraction and to prevent switching an ECC outlet to a break flow inlet during a DVI line break, is presented for an advanced DVI system. In the current DVI system, the ECC water injected into the downcomer is easily shifted to the broken cold leg by a high steam cross flow which comes from the intact cold legs during the late reflood phase of a LBLOCA (Large Break Loss Of Coolant Accident)For the new DVI+ system, an ECBD (Emergency Core Barrel Duct) is installed on the outside of a core barrel cylinder. The ECBD has a gap (From the core barrel wall to the ECBD inner wall to the radial direction) of 3/25~7/25 of the downcomer annulus gap. The DVI nozzle and the ECBD are only connected by the ECC water jet, which is called a hydrodynamic water bridge, during the ECC injection period. Otherwise these two components are disconnected from each other without any pipes inside the downcomer. The ECBD is an ECC downward isolation flow sub-channel which protects the ECC water from the high speed steam crossflow in the downcomer annulus during a LOCA event. The injected ECC water flows downward into the lower downcomer through the ECBD without a strong entrainment to a steam cross flow. The outer downcomer annulus of the ECBD is the major steam flow zone coming from the intact cold leg during a LBLOCA. During a DVI line break, the separated DVI nozzle and ECBD have the effect of preventing the level of the cooling water from being lowered in the downcomer due to an inlet-outlet reverse phenomenon at the lowest position of the outlet of the ECBD.

환경강수부의 물-유동 특성

권태순(Tae-Soon Kwon),이승태(Seung-Tae Lee),송철화(Chul-Hwa Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

A new design feature of DVI+, to mitigate an ECC bypass fraction and to prevent switching an ECC outlet to a break flow inlet during a DVI line break, is presented for an advanced DVI system. The injected ECC water into the downcomer is easily shifted to the broken cold leg by a high steam cross flow which is coming from the intact cold legs during the late reflood phase of a LBLOCA in the current DVI system. For a protective ECC flow down channel from a high-speed cross flow in a downcomer, a 4-duct which is called an ECC extension duct is installed at the outside of a core barrel cylinder. The ECC extension duct has a gap (height to the radial direction) of 3/25~7/25 of the downcomer annulus gap. The DVI nozzle and the ECC extension duct are only connected by the ECC water jet which is called a hydrodynamic water bridge during an ECC injection period. Otherwise these two components are disconnected from each other without any pipes inside the downcomer. The ECC extension duct is fully separated ECC water down flow channels from the steam flow downcomer annulus during a LOCA event. The injected ECC water flows downward into the lower down comer through the ECC extension duct without a strong entrainment to a steam cross flow. The outer downcomer annulus of the ECC extension duct is the major steam flow zone coming from the intact cold leg during a LBLOCA. During a DVI line break, the separated DVI nozzle and extension duct have the effect of preventing the level of the cooling water from being lowered in the downcomer due to an inlet-outlet reverse phenomenon at the lowest position of the outlet of the DVI extension duct. The feasibility of DVI+ has been tested to evaluate the LOCA performance using the CFX code. The test results show that it predicts the ECC water flows to the lower downcomer well and the ECC bypass fraction is very low

ADVANCED DVI+

TAE-SOON KWON 한국원자력학회 2012 Nuclear Engineering and Technology Vol.44 No.7

A new advanced safety feature of DVI+ (Direct Vessel Injection Plus) for the APR+ (Advanced Power Reactor Plus), to mitigate the ECC (Emergency Core Cooling) bypass fraction and to prevent switching an ECC outlet to a break flow inlet during a DVI line break, is presented for an advanced DVI system. In the current DVI system, the ECC water injected into the downcomer is easily shifted to the broken cold leg by a high steam cross flow which comes from the intact cold legs during the late reflood phase of a LBLOCA (Large Break Loss Of Coolant Accident)For the new DVI+ system, an ECBD (Emergency Core Barrel Duct) is installed on the outside of a core barrel cylinder. The ECBD has a gap (From the core barrel wall to the ECBD inner wall to the radial direction) of 3/25~7/25 of the downcomer annulus gap. The DVI nozzle and the ECBD are only connected by the ECC water jet, which is called a hydrodynamic water bridge, during the ECC injection period. Otherwise these two components are disconnected from each other without any pipes inside the downcomer. The ECBD is an ECC downward isolation flow sub-channel which protects the ECC water from the high speed steam crossflow in the downcomer annulus during a LOCA event. The injected ECC water flows downward into the lower downcomer through the ECBD without a strong entrainment to a steam cross flow. The outer downcomer annulus of the ECBD is the major steam flow zone coming from the intact cold leg during a LBLOCA. During a DVI line break, the separated DVI nozzle and ECBD have the effect of preventing the level of the cooling water from being lowered in the downcomer due to an inlet-outlet reverse phenomenon at the lowest position of the outlet of the ECBD.

Full Color LED 디스플레이장치와 휘도 개선과 호환성을 갖는 통합인터페이스 제어장치 구현

이주연 중소기업융합학회 2021 융합정보논문지 Vol.11 No.12

In this paper, we designed manufactured and design an integrated interface control unit that has compatibility with brightness control unit, color control unit, and existing control unit. As the implementation method the standard of DVI/HDMI transmission method is applied to the data transmission method, and the Sil 1169 IC is used as the applied IC. Brightness control is programmed to have eight levels of brightness control using the AT89C2051. Also, EPM240T100C5 IC was used for image and dimming data processing. As a result, it is compatible with the control unit using the DVI/HDMI transmission method manufactured by each company and can reproduce clear high quality full HD video according to the surrounding brightness through the full color LED display system. 본 논문에서는 밝기제어장치 및 색상제어장치 그리고 기존의 제어장치와의 호환성을 갖는 통합 인터페이스 제어장치 설계하고 제작하여 구현하였다. 구현 방법으로는 데이터 전송방식은 DVI/HDMI 전송방식의 규격을 적용하였으며 적용한 IC는 Sil1169 IC를 사용하였다. 밝기제어는 AT89C2051을 사용하여 8단계의 밝기조절 기능을 갖도록 프로그래밍하였다. 또한 영상 및 디밍 데이터 처리를 위하여 EPM240T100C5 IC를 사용하여 제작하였다. 그 결과로 기존에 제작하여 사용되어지고 있는 DVI/HDMI 전송방식을 적용한 제어장치와 호환이 가능하고, 주변 밝기에 따라 선명하고 고품질의 Full HD급 영상을 LED 디스플레이 장치에 통하여 재생할 수 있는 결과를 얻었다.

TRACE V5 CODE APPLICATION DVI LINE BREAK LOCA USING ATLAS FACILITY

Veronese, Fabio,Kozlowsk, Tomasz Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.7

The object of this work is the validation and assessment of the TRACE v5.0 code using the scaled test ATLAS1 facility in the context of a DVI2 line break. In particular, the experiment selected models the 50%, 6-inch break of a DVI line. The same experiment was also adopted as a reference test in the ISP-503. The ISP-50 was proposed to, and accepted by, the OECD/NEA/CSNI due to its technical importance in the development of a best-estimate of safety analysis methodology for DVI line break accidents. In particular, the behavior of the two-phase flow in the upper annulus downcomer was expected to be complicated. What resulted was the need for relevant models to be implemented into safety analysis codes, in order to predict these thermal hydraulic phenomena correctly.

TRACE V5 CODE APPLICATION DVI LINE BREAK LOCA USING ATLAS FACILITY

FABIO VERONESE 한국원자력학회 2012 Nuclear Engineering and Technology Vol.44 No.7

The object of this work is the validation and assessment of the TRACE v5.0 code using the scaled test ATLAS1 facility in the context of a DVI2 line break. In particular, the experiment selected models the 50%, 6-inch break of a DVI line. The same experiment was also adopted as a reference test in the ISP-503. The ISP-50 was proposed to, and accepted by, the OECD/NEA/CSNI due to its technical importance in the development of a best-estimate of safety analysis methodology for DVI line break accidents. In particular, the behavior of the two-phase flow in the upper annulus downcomer was expected to be complicated. What resulted was the need for relevant models to be implemented into safety analysis codes, in order to predict these thermal hydraulic phenomena correctly.

고급유 패키지 디자인의 리뉴얼 효과에 대한 연구 - CJ제일제당 백설 고급유 제품을 중심으로 -

김지선,심유리 한국브랜드디자인학회 2014 브랜드디자인학연구 Vol.12 No.1

기업들은 빠르게 변화하는 시장 환경과 소비자 트렌드를 선도하기 위해 앞 다투어 신제품 출시와 리뉴얼 전략에 선택하여 대응하고 있다. 소비자의 니즈를 파악하고 반영하는 현대의 패키지 디자인 리뉴얼은 일부 그래픽 요소 변경에서 용기디자인, 브랜드 전략 관점까지 범위가 점차 확장되고 있다. 소비자에게는 구매 만족도를 높이고 기업에게는 효과적인 브랜딩과 시장점유율, 매출향상에 도움이 되는 성공적인 리뉴얼 전략을 제시하기 위해 본 연구를 진행하였다. 이론적 배경을 통하여 브랜드 재활성화와 패키지 디자인 리뉴얼의 개념을 정리하였고, 국내 고급유 브랜드의 시장 상황을 바탕으로 가설을 설정하였다. 고급유 구매요인으로 패키지 디자인의 중요성은 시간이 지날수록 상승할 것이며, 고급유의 Surface 리뉴얼보다 Structure 리뉴얼에 더 큰 만족도를 느낄 것이고, 패키지 디자인 리뉴얼은 구매요인을 상승시켜 매출에 영향을 줄 것이라는 세 가지 가설이다. 가설을 검증하기 위한 연구조사는 CJ제일제당의 디자인 정량화 방법론인 DVI를 사용하였으며, 연구 대상은 CJ제일제당과 경쟁사 5개 업체 중 선택된 고급유 브랜드의 올리브유, 포도씨유, 카놀라 유세 종류의 제품이며, 연구기간은 2006년부터 2013년까지로 2011년을 제외한 7년의 기간 동안 산 출된 데이터를 바탕으로 하였다. 그 결과 오랜 시간 동안 변화하는 시장과 브랜드, 제품, 소비자의 관계 속에서 패키지 디자인의 중 요성과 디자인 리뉴얼의 방향과 범위에 따른 소비자 만족도, 매출 상승과의 상관관계를 확인할 수 있었다. 본 논문이 국내 디자인 산업에서 장기적 관점으로 신중하게 디자인 리뉴얼 전략을 실행할 수 있는 좋은 본보기로 사용되기를 바란다. In order to lead rapidly changing market environments and customer trends, companies are trying to launch new products and establish renewal strategy. Previous scope of package design renewal which focused on a part of graphical elements is expanding into container design and brand strategy perspective. The study proposes successful renewal strategy to enhance customer's purchasing satisfaction, suggest direction which is helpful for companies to build effective branding and increase market share and sales. In theoretical background, the concept of brand re-activation and package design renewal is clarified. Hypothesis for the study is established based on domestic high-quality cooking oil market situation. There are three major version of the hypothesis. First, the importance of package design rise up for purchasing factor of premium oil as time goes by. Second, consumer will satisfied with structure design renewal than surface design renewal. Last, package design renewal makes rise purchasing factor and impact sales. Design value index (DVI), CJ Cheiljedang's quantitative methods for measuring design quality, is used for the study. The objects of study are CJ, SajoHaepyo, Daesang, Ottogi, Dongwon F&B. Studies are conducted as comparisons between CJ and other selected 5 competitors' 3 kinds of high-quality cooking oil: olive oil, grapeseed oil, and canola oil. The study is based on 7 years data from 2006 to 2013, excepting 2011. As a result, correlation between customers' satisfaction and sales increase is identified. In terms of relationship among market, brand, product, and customer, the correlation is verified according to direction for design renewal and scope of that. The study is useful to develop long-term perspective design renewal strategy in domestic market.

1/5 스케일 실험 장치를 이용한 DVI+ 실험적 성능 평가

김기환(Kihwan Kim),최해섭(Hae Seob Choi),박길원(Kilwon Park),어동진,권태순(Tae Soon Kwon) 한국유체기계학회 2015 한국유체기계학회 학술대회 논문집 Vol.2015 No.12

Modeling of Leaked Digital Video Signal and Information Recovery Rate as a Function of SNR

Tae-Lim Song,Yi-Ru Jeong,Jong-Gwan Yook IEEE 2015 IEEE transactions on electromagnetic compatibility Vol.57 No.2

<P>Substantial information leakage at PC monitors and TV systems arises in the form of unintentional emissions of high-speed digital video signals, such as DVI/HDMI. The information recovery rate from the emanated video signal varies depending on the SNR of the receiver system, which is placed a certain distance away. In this study, a situation in which the signal from a digital video system is intercepted is modeled using full-wave electromagnetic and circuit simulations. For a quantitative evaluation of the eavesdropping threat of display systems and the effect of its countermeasure, the readability of characters on a hypothetical screen as a function of the BER of the recovery signals is presented. It is clear that a decrease of the SNR of the received signal causes a deterioration of the digital video signal-recovery rate and consequently degrades the legibility of the characters on the intercepted screen. It is expected that these techniques can be useful for measurements and analyses of the effects of countermeasures, such as noise jamming or signal modulation, to prevent interceptions of digital video information.</P>

회전익 항공기 다기능시현기의 이상시현을 방지하기 위한 DVI 케이블 개선

김영목(Young Mok Kim),정상규(Sang-Gyu Jeong),조재포(Jae Po Cho),최두현(Doo-Hyun Choi) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.9

한국형 기동헬기(KUH)의 다기능시현기(MFD)는 항공기 운용 중 임무컴퓨터(MC)로부터 영상정보(항법, 비행, 생존, 지형 및 정비 관련 정보)를 입력받아 시현한다. 체계개발 단계에서 식별된 MFD 이상시현(화면 깜박임 현상 등)은 항공기 초도양산 과정에서 DVI 케이블 차폐 성능 개선과 DVI 케이블 장착 경로 변경을 통하여 해소하였다. 항공기 납품 후 1~2년 정도 경과하였을 때 MFD 이상시현이 다시 발생하였고, 파생형헬기 시험평가 과정에서도 식별되었다. 이러한 MFD 이상시현의 해결을 위하여 항공기 체계 단위의 종합 검토를 수행하였고, DVI 케이블의 개선을 통한 설계 개선방안을 도출하였다. 본 논문에서는 MFD 이상시현의 발생원인을 분석하였고, 설계 개선방안 검토과정을 정리하였다. 그리고 설계 개선사항에 대한 타당성을 DVI 케이블 조립체 비교시험, SIL/지상/비행시험 결과를 바탕으로 입증하였다. Multi-Function Display (MFD) of Korean Utility Helicopter (KUH) displays image information(navigation, flight, topographical and maintenance information) delivered from Mission Computer (MC) during flight operation. The abnormal display of MFD such as flickering phenomenon was identified in the system development. It was solved by improving the shielding performance of the DVI cable and changing the DVI cable installation path at the first mass production. However, it was occurred again when the aircraft was operated for one or two years after delivery. It was also identified in the evaluation process of the derivative helicopters. Therefore, a comprehensive review of the aircraft system level has been performed to solve the problem of MFD malfunction at first and then a design improvement plan was derived by improving the DVI cable. In this paper, the causes of MFD anomalies are analyzed and also the process of design improvement are summarized. The validity of the improvement has been verified through the DVI cable assembly comparison test, SIL/ground/flight test.