• Title, Summary, Keyword: Logical consequence

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An Experimental Study on the Semi-Automated Formal Verification of Cryptographic Protocols (암호프로토콜 논리성 자동 검증에 관한 연구)

  • 권태경;양숙현;김승주;임선간
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.13 no.1
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    • pp.115-129
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    • 2003
  • This paper presents a semi-automated formal verification method based on the famous SVO logic, and discusses its experimental results. We discuss several problems on automating the SVO logic and design its derivative, ASVO logic for automation. Also the proposed method is implemented by the Isabelle/Isar system. As a result, we verified the well-known weakness of the NSSK protocol that is vulnerable to the Denning-Sacco attack, using our Isabelle/ASVO system. Finally, we refined the protocol by following the logical consequence of the ASVO verification.

A Characteristic Heating-Energy Expend of Insulation Block System for Korea Type Passive House (한국형 패시브하우스를 위한 단열블럭시스템의 난방에너지소비 특성)

  • Kang, Jae-Sik;Choi, Gyoung-Seok;Yang, Kwan-Seop;Lee, Seung-Eon
    • Proceedings of the SAREK Conference
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    • pp.603-607
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    • 2009
  • About a Structure is performance external insulation is fundamantal performance for enrgy-saving. these day, most of residential structures have constructed by internal insulation method structure. The method structure internal insulation have construction and economical efficiency, but on the other hand, be generated heat loss by heat bridge especially, be generated loss heat-energy logical consequence in structure ondol. The external insulation structure method has a mert able to minimum to loss heat about heat-bridge. But the external insulation technique is unsatisfactory statues within the know-how and method of construction and materials compared with developed countries. The recently, the requirement of market related to the external insulation technique is resulted by the energy efficiency system, but it can lead to the lack of alternative technique In study on the korea type passive house building design for insulation block method of wall system has to experimental characteristic heat-energy of practice building. In result field-experimental, the heat-bridge appeared to characteristic spent heat-energy of blow 2L class and have a suffience performance it.

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DISCUSSION ABOUT HBS TRANSFORMATION IN HIGH BURN-UP FUELS

  • Baron, Daniel;Kinoshita, Motoyasu;Thevenin, Philippe;Largenton, Rodrigue
    • Nuclear Engineering and Technology
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    • v.41 no.2
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    • pp.199-214
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    • 2009
  • High burn-up transformation process in low temperature nuclear fuel oxides material was observed in the early sixties in LWR $UO_2$ fuels, but not studied in depth. Increasing progressively the fuel discharge burn-up in PWR power plants, this material transformation was again observed in 1985 and identified as an important process to be accounted for in the fuel simulations due to its expected consequence on fuel heat transfer and therefore on the fission gas release. Fission gas release was one of the major concerns in PWR fuels, mainly during transient or accidents events. The behaviour of such a material in case of rod failure was also an important aspect to analyse. Therefore several national and international programs were launched during the last 25 years to understand the mechanisms leading to the high burn-up structure formation and to evaluate the physical properties of the final material. A large observations database has been acquired, using the more sophisticated techniques available in hot cells. This large database is discussed in this paper, providing basis to build an engineering-model, which is based on phenomenological description data and information accumulated. In addition this paper has the ambition to construct the best logical model to understand restructuring.

Patterns of mathematical concepts and effective concept learning - around theory of vectors (수학적 개념의 유형과 효과적인 개념학습 - 벡터이론을 중심으로)

  • Pak, Hong-Kyung;Kim, Tae-Wan;Lee, Woo-Dong
    • Journal for History of Mathematics
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    • v.20 no.3
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    • pp.105-126
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    • 2007
  • The present paper considers how to teach mathematical concepts. In particular, we aim to a balanced, unified achievement for three elements of concept loaming such as concept understanding, computation and application through one's mathematical intuition. In order to do this, we classify concepts into three patterns, that is, intuitive concepts, logical concepts and formal concepts. Such classification is based on three kinds of philosophy of mathematics : intuitionism, logicism, fomalism. We provide a concrete, practical investigation with important nine concepts in theory of vectors from the viewpoint of three patterns of concepts. As a consequence, we suggest certain solutions for an effective concept learning in teaching theory of vectors.

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Seismic Design Provisions and Revisions to the Guides for RC Flat Plate Systems in the US (미국에서의 RC무량판 내진설계기준과 개정 방향)

  • Kang, Thomas H.K.;Park, Hong-Gun
    • Magazine of the Korea Concrete Institute
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    • v.20 no.2
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    • pp.25-36
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    • 2008
  • Seismic design of reinforced concrete flat plate structures is often complicated as it deals with three dimensionality and continuous spans, and mostly material complexity and reinforcement variation. A great degree of uncertainty in such structural and material properties is thus inherent in the RC flat plate systems, and hinders simplification of the design process in terms of slab flexure, unbalanced moment transfer at a slab-column connection, and punching shear. For these reasons, there have been substantial changes and updates in building codes relating to flat plates and slab-column connections over a handful of decades. Also, for the same reason, some of codes never have been revised. As a consequence of nonsimultaneous development of each provision, it tends to confuse structural engineers when using a mixture of all different US code provisions. In this paper, in the step-by-step logical order, seismic design of the RC flat plate systems is re-organized and clarified to make it easier to apply. Furthermore, recent changes or proposed changes are introduced, and are explained as to how it will apply in practice.

Analytical Tools for Ideological Texts in Critical Reading Instruction

  • Lee, Jong-Hee
    • English Language & Literature Teaching
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    • v.10 no.3
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    • pp.89-112
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    • 2004
  • This article examines the ways in which language can be exploited in the manipulation of the reader's interpretation of a text to make him/her take certain lines of thought according to the writer's persuasive intents. Such functions of language provide valid foundations to support the teaching of critical reading skills and to explore an adequate approach to discourse analysis. A pilot study was conducted to find out the extent to which the reader can be coaxed into thinking in some fashions guided by specific linguistic devices employed for ideological texts. Forty-seven subjects divided into two groups (humanities majors and natural science majors at undergraduate level) joined the two-fold questionnaire surveys intended to look at their critical reading abilities. The empirical results indicate that college students whose majors are humanities were more inclined to take a holistic approach in processing commercial advertisement texts and their abilities for critical interpretation appeared to be lower than those of the subjects whose majors are natural sciences, who showed a relatively high tendency to take an analytical approach in decoding the textual facts. As a consequence, pedagogic implications for increasing critical reading abilities have resulted in a set of analytical procedures concerning ideological texts which is linked with instructional guidelines to emphasize the importance of the reader's logical and analytical reasoning power, entirely accepted as a general prerequisite for cracking the covert language gambits.

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A Study on the Meaning and Revitalization Strategy of Landscape Architecture in University Campus (대학 캠퍼스 조경의 의미와 활성화 방안에 관한 연구)

  • Kim, Jong-Pyo;Kim, Yong-Soo
    • Journal of the Korean Institute of Educational Facilities
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    • v.14 no.1
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    • pp.14-22
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    • 2007
  • This study is to examine the present situation relating to the works for landscape architecture in the universities of Korea with the aim of efficient landscape architecture in university campus and to provide the fundamental data of the logical and organized approach to the plans for campus landscape architecture. A survey of the staffs for landscape architecture in 20 national universities all over the country was carried out on the lot utilization ratio of each university, the development of landscape architecture department and its professionals in universities, the establishing status of the plans for landscape architecture of each university, and the satisfaction level of landscape architecture staffs. The results show that most universities pay a little attention to the whole campus landscape architecture according as they don't conduct the systematic works for landscape architecture and some which are done partially attach importance only to maintenance work such as simple controls of open space and trees. As a consequence, the active utilization of potential lot on campus and the organization of professionals and specialized teams for landscape architecture should be realized in order to make the works for campus landscape architecture effective. Besides, in policies, it is thought that the development of general plans and budgets for landscape architecture at the stage of establishing the medium-and long-tenn growth schemes of the universities is required.

Sorites Paradox and Supervaluationism (더미의 역설과 초평가주의)

  • Lee, Jinhee
    • Korean Journal of Logic
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    • v.16 no.2
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    • pp.189-231
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    • 2013
  • The purpose of this paper is to show that Williamson's counterexamples and Fara's paradox do not conclusively refute supervaluationism. I will achieve this purpose on the basis of local validity. In general, people regard supervaluational validity as global validity. And D-introduction, which is premise of Williamson's counterexamples and Fara's paradox, is justified only if we assume global validity. But it cannot correctly grasp supervaluational semantics, especially semantic character of D-operator. So I will show that validity of supervaluationism is local and define global validity by local validity. Strategy of this paper is to protect supervaluationism against Williamson's counterexamples and Fara's paradox by minimal modification of supervaluationism and to prove that supervaluational logic is not revisionary and weak for solving the sorites paradox.

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An Update on Prader-Willi Syndrome with Diabetes Mellitus

  • Lee, Ji-Eun
    • Journal of mucopolysaccharidosis and rare diseases
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    • v.2 no.2
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    • pp.35-37
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    • 2016
  • Prader-Willi syndrome (PWS) often develops type 2 diabetes mellitus (T2DM) related to severe obesity. The prevalence of T2DM in adults with PWS (7-20%) exceeds greatly the prevalence in the general population (5-7%). It is uncommon for pre-pubertal children with PWS to develop overt diabetes or glucose intolerance. GH therapy and genotype did not influence the development of altered glucose metabolism. It has been assumed that T2DM in PWS develops as a consequence of morbid obesity and concomitant insulin resistance. However recent studies suggest the relationship between morbid obesity and T2DM development is more complex and appears to differ in PWS subjects compared to non-PWS subjects. PWS patients had relatively lower fasting insulin levels and increased adiponectin levels compared with BMI-matched obese control despite of similar levels of leptin. So PWS children may be protected to some extent form of obesity-associated insulin resistance. Although there's no data, it seems logical to approach diabetes management including weight loss and increased exercise, using similar pharmacological agents as with non-PWS obesity-related diabetes such as metformin or thiazolidinedione, with the introduction of insulin as required. On the other hand, several recent T2DM in PWS case reports suggest favorable outcomes using Glucagon-like peptide 1 (GLP-1) analog with regard to ghrelin reduction, control of glucose and appetite, weight loss and pre-prandial insulin secretion. The role of GLP-1 agonist therapy is promising, but has not yet been fully elucidated.

Practices of Sustainable Agriculture in Korea With References for the Development of Sustainable Rice Production Systems (한반도에서 지속농업의 실천방안 지속적 벼 생산체계 개발을 중심으로)

  • Choe Zhin Ryong;Kim Jeong Bu;Cho Yong Son
    • Proceedings of the Korean Society of Crop Science Conference
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    • pp.288-312
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    • 1998
  • In Korea, chemical fertilizers and agricultural chemicals have had a significant impact on food production and these are today thought to be an indispensable part of modern agriculture. On the other hand, socioeconomical and IMF and WTO status in Korea are constant reminders of the vulnerability of our fossil fuel dependent agriculture. A new crop production system to improve economic, environmental and production efficiency must be exploited. Our particular concern has been given to an integrated cropping system involving recycling of crop residues, soil and N management, biological N fixation and multipurpose legumes. As a new integrated crop production system, a no-till direct-sown rice-vetch relaying cropping system has been proposed in this paper. The formulation of this system is based on the conception that N fertilizers being neither limitlessly available nor affordable, the current high-input crop production systems have produced troubled results severe labour shortage ill rural areas, balance of payment, environmental degradation and reduction of human health far exceed economic concerns. A natural and logical consequence is that long-term sustainability of agricultural systems must rely on the use and effective management of internal resources. Based on the information obtained throughout a series of experiments last years we have proved that the no-till direct-sown rice-vetch relaying cropping system dictates biological alternative which can augment, and in some cases replace, N fertilizers. Comprehensive discussions were made for the proposed system and it concluded that the system can offer an economically attractive and ecologically sound means of reducing external nitrogen input and improving the quality and quantity of internal resources, and consequently improving the farmers as well as the national returns.

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