• 사상체질의학회지
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• 제16권2호
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• pp.44-51
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• 2004

1. Objectives This paper is written for clear understanding on the concepts of 'Deep adherence of the Nature' and 'Sudden explosion of the Emotion' and for intensive comprehension of Mechanism of 'The Exterior Disease' and 'The Interior Disease' by The Nature and the Emotion. 2. Methods The study mainly based on "The exterior disease injured by the Nature, the interior disease injured by the Emotion" and deals with 'Seongmyungron, Sadanron, Hwarkchungron and Jangburon'. 3. Results and conclusions The conclusions as follows (1) Exterior Disease in each constitution breaks out by deep adherence of the Nature. Interior Disease brings out with sudden explosion of the Emotion. (2) 'Deep adherence of the Nature' is the state that the Ear, Eye, Nose, Mouth taking care of environmental frames can't work enoughly because of wrong minds on the Jaw, Breast, Umbilicus, Abdment. 'Sudden explosion of the Emotion' is the state that the Lung, Spleen, Liver, Kidney doing human affairs doesn't do appropriately for each constitution due to negative minds on the Head, Shoulder, Waist, Hip. (3) The result that the Ear, Eye, Nose, Mouth doesn't extract the clear energy from 'Jin, Go, You, Yaek sea' so they are lack of 'Shin, Qi, Hyul, Jeong' causes exterior disease in each constitution. (4) In each constitution, Interior disease results from that the Lung, Spleen, Liver, Kidney fails to bring on the clear juice from 'Lee, Mak, Hyul, Jeong sea', so shortage of 'Jin, go, You, Yaek' results in it.

• 대한조선학회논문집
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• 제54권1호
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• pp.63-70
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• 2017

Release of hazardous and flammable gas is a significant contributor to risk. The ignition of flammable gas clouds can lead to explosion accidents in the offshore installations. A gas detector, which is one of active protect systems, brings the module into a safe state through emergency shut down processes and reduces the damage by eliminating the dangerous releases. It is critical to understand the gas release, the wind field, and the complex geometry of installations to determine gas detector placement. In this paper, the Gas detector Location Index (GLI) which is a novel index for optimal detector location determination to efficiently prevent explosion accident using probabilistic approach.

• 한국지열·수열에너지학회논문집
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• 제18권3호
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• pp.7-18
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• 2022

Secondary batteries used in electric vehicles have a potential risk of ignition and explosion. Various safety measures are being taken to prevent these risks. A numerical study was performed using a computational fluid dynamics code on the cases where pressure relief vents that can reduce the blast overpressures of batteries were installed in the through-compression test room, short-circuit drop test room, combustion test room, and immersion test room in facilities rleated to battery used in electric vehicles. This study was conducted using the weight of TNT equivalent to the energy release from the battery, where the the thermal runaway energy was set to 324,000 kJ for the capacity of the lithium-ion battery was 90 kWh and the state of charge (SOC) of the battery of 100%. The explosion energy of TNT (△H_TNT) generally has a range of 4,437 to 4,765 kJ/kg, and a value of 4,500 kJ/kg was thus used in this study. The dimensionless explosion efficiency coefficient was defined as 15% assuming the most unfavorable condition, and the TNT equivalent mass was calculated to be 11 kg. The internal explosion generated in a test room shows the very complex propagation behavior of blast waves. The shock wave generated after the explosion creates reflected shock waves on all inner surfaces. If the internally reflected shock waves are not effectively released to the outside, the overpressures inside are increased or maintained due to the continuous reflection and superposition from the inside for a long time. Blast simulations for internal explosion targeting four test rooms with pressure relief vents installed were herein conducted. It was found that that the maximum blast overpressure of 34.69 bar occurred on the rear wall of the immersion test room, and the smallest blast overpressure was calculated to be 3.58 bar on the side wall of the short-circuit drop test room.

• 정보처리학회논문지D
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• 제11D권1호
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• pp.115-122
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• 2004

소프트웨어 시스템 모델링에서는 정형적 기법으로 소프트웨어를 모델링하고 분석하여 소프트웨어 시스템이 가지는 문제점들을 구현에 앞서 미리 찾아 해결하고자 한다. 페트리 네트는 그래픽 정형 명세 언어로 병행적 시스템, 실시간 시스템, 통신 프로토콜 등의 소프트웨어 시스템 모델링 및 분석에 널리 이용되고 있다. 페트리 네트 분석에서, 교착상태(deadlock), 수행가능성(liveness) 등의 일반적인 시스템 특성 분석은 주로 도달성 분석을 통해 이루어지며 시스템 요구사항에 관한 고유 특성 분석은 모델 검사(model checking) 방법을 통해 이루어진다 하지만 도달성 분석과 모델 검사 방법에서는 기본적으로 시스템의 모든 가능한 상태들을 나열하여 분석하므로 모델의 규모가 커짐에 따라 상태가 기하급수적으로 증가하는 상태 폭발(state explosion) 문제가 발생한다. 이 논문에서는 상태 폭발을 회피하면서 시스템의 요구사항을 체계적으로 분석할 수 있는 새로운 방법을 제안하고자 한다. 먼저 분석하고자 하는 요구사항을 속성 네트로 나타낸 후, 시스템 모델과 속성 네트를 합성하여 분석한다. 이러한 합성 분석에서는 분석 대상 속성과 연관되지 않는 모델의 부분들을 축약 규칙에 따라 축약함으로써 분석 도메인을 점진적으로 줄어 나갈 수 있으며 요구사항 만족 여부를 간단히 검사할 수 있는 장점이 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.887-890
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• 1998

We present a method for initialization of asynchronous circuits using binary decision space representation. From state transition graph(STG) which is given as a specification a circuit, the BDD is generated to solve the state space explosion problem which is caused by concurrecy of STG. We first step, we construct the necessary informaton as a form of K-map from BDD, then find an initial state on the K-map by assignment of don't care assignment.

• 한국정보과학회논문지:소프트웨어및응용
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• 제35권1호
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• pp.12-21
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• 2008

실생활과 밀접한 환경에서 컴퓨터 시스템의 사용이 늘어남에 따라 이러한 시스템들의 신뢰성, 안전성 등을 철저히 확인할 수 있는 검증 기술의 필요성이 한층 증가되고 있다. 유한상태머신은 이러한 시스템 모델링 및 분석에 활용되는 다양한 정형적 기법의 기본 모델로 널리 이용되고 있으며 효율적인 분석을 위해 내부 이벤트에 대한 추상화 기법이 제공된다. 하지만 기존의 추상화 방법은 유한상태머신 모델을 생성한 후에 적용될 수 있으므로 상태폭발에 효과적으로 대처하지 못하는 문제점이 있다. 이 연구에서는 유한상태머신 정보를 효과적으로 표현할 수 있는 새로운 표기법으로, 병행적 특성을 나타낼 수 있는 slice 모델 개념을 제시하고 이를 근간으로 내부 트랜지션을 축약하는 추상화 알고리즘을 제시한다. 기존의 유한상태머신 기반의 추상화 방법은 모든 상태를 나열하여야만 분석할 수 있는데 반해, 제안된 추상화 방법은 필요한 분석 공간만을 부분적으로 생성함으로 시간 및 공간적인 관점에서 효율적이다.

• Asian Journal of Innovation and Policy
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• 제12권3호
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• pp.345-362
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• 2023

As the widespread adoption and proliferation of electric vehicles continue, the secondary battery market is experiencing rapid growth. However, lithium-ion batteries, which constitute a majority of secondary batteries, present high risks of fire and explosion. Solid-state batteries are thus garnering attention as the next-generation batteries since they eliminate fire hazards and significantly reduce the risk of explosions. Against this background, the study aimed to analyze research trends and provide insights by examining 2,927 domestic papers related to solid-state batteries over the past decade (2013-2022). Specifically, we used topic modeling to extract major keywords associated with solid-state batteries research and to explore the network characteristics across major topics. The changes in research on solid-state batteries were analyzed in-depth by calculating topic dominance by year. The findings provide an overview of the emerging trends in domestic solid-state battery research, and might serve as a valuable reference in shaping long-term research directions.

• 천문학회보
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• 제35권2호
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• pp.68.1-68.1
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• 2010

Cassiopeia A supernova remnant is a young (~330 yr) remnant of Type IIb SN explosion with a massive progenitor. It shows two distinct optical knots; fast moving ejecta knots (FMKs) and quasi stationary circumstellar knots (QSFs). These knots offer an unique opportunity to explore the details of the explosion and also the end state evolution of the Type IIb SN progenitor. We have obtained NIR long-slit (30") spectra of 7 positions around the bright rim of Cas A in [Fe II] 1.644 micron using Triplespec which is a cross-dispersed near-infrared spectrograph that provides continuous wavelength coverage from 0.95-2.46um at intermediate resolution of 2700. Most of the FMKs show strong sulfur, silicon, and iron forbidden lines but no hydrogen or helium lines. The QSFs, on the other hand, show a much richer spectrum with strong hydrogen, helium, and iron lines, but no sulfur and silicon lines. We measure their fluxes and radial velocities, and derive their physical parameters such as electron density and temperature. We also measure the proper motion of these knots from two [Fe II] 1.644 micron images obtained at 3-year interval. We analyze the physical properties of these knots and discuss the evolution and explosion of the progenitor of Cas A.

• 한국전산유체공학회지
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• 제11권1호
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• pp.29-35
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• 2006

A code is developed to analyze a spherically symmetric underwater explosion. The arbitrary Lagrangian-Eulerian(ALE) Godunov scheme for two-phase flow is used to calculate numerical fluxes through moving control surfaces. For detonation gas of TNT and liquid water, the Jones-Wilkins-Lee(JWL) equation of states and the isentropic Tait relation are used respectively. It is suggested to use the Godunov variable to estimate the velocity of a material interface. The code is validated through comparisons with other results on the gas-water shock tube problem. It is shown that the code can handle generation of discontinuity and recovering of continuity in the normal velocity near the material interface during shock waves interact with the material interface. The developed code is applied to analyze a spherically symmetric underwater explosion. Repeated transmissions of shock waves are clearly captured. The calculated period and maximum radius of detonation gas bubble show good agreements with experimental and other numerical results.

• 한국전기전자재료학회논문지
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• 제25권10호
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• pp.824-829
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• 2012

Zn wires have been electrically exploded in methanol or distilled water using the pulsed power technologies. The nanopowders produced by the explosions have been observed by using SEM and TEM, and analyzed its phase by using EDS and XRD. The nanopowders produced in distilled water showed ZnO phase only. On the other hands, the nanopowder produced in methanol showed mixed phases with Zn and ZnO. The HR-TEM images of the nanopowders produced in methanol showed that the some particles have been coated with carbon like materials. It is considered that the carbon coatings could be depended on the positions of the particles during the plasma state formed by explosion.