• 한국수소및신에너지학회논문집
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• 제33권3호
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• pp.261-265
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• 2022

In this paper, comparative studies between Linde, Claude and advanced cycle for the liquefaction of nitrogen have been completed. PRO/II with PROVISION release 2021. 1 from AVEVA company (Cambridge, UK) was used, and Peng-Robinson equation of the state model with Twu's alpha function was selected for the modeling of the condensation of nitrogen. When using Claude liquefaction, we can reduce the total compression power by 49.25% for the comparison of Linde cycle. And finally, we could conclude that 90.41% of total compression power was saved when using an advanced cycle being compared to Linde liquefaction cycle.

• 한국수소및신에너지학회논문집
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• 제33권4호
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• pp.446-450
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• 2022

In this paper, comparative studies between Linde-Hampson and Claude cycle for the liquefaction of oxygen have been completed. PRO/II with PROVISION release 2021. 1 from AVEVA company (Cambridge, UK) was used, and Peng-Robinson equation of the state model with Twu's alpha function was selected for the modeling of the condensation of oxygen. When using Claude liquefaction cycle, we could reduce the total compression power by 59.51% for the comparison of Linde-Hampson cycle.

• 설비공학논문집
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• 제20권12호
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• pp.775-780
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• 2008

A dynamic model to simulate LNG reliquefaction process has been developed. The model was applied to two candidate cycles for LNG reliquefaction process, which are Reverse Brayton and Claude cycles. The simulation was intended to simulate the pilot plant under construction for operation of the two cycles and evaluate their feasibility. According to the simulation results, both satisfy control requirements for safe operation of brazed aluminum plate-fin type heat exchangers. In view of energy consumption, the Reverse Brayton cycle is more efficient than the Claude cycle. The latter has an expansion valve in addition to the common facilities sharing with the Reverse Brayton cycle. The expansion valve is a main cause to the efficiency loss. It generates a significant amount of entropy associated with its throttling and increases circulation flow rates of the refrigerant and power consumption caused by its leaking resulting in lowered pressure ratio. It is concluded that the Reverse Brayton cycle is more efficient and simpler in control and construction than the Claude cycle.

• International Journal of Air-Conditioning and Refrigeration
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• 제17권4호
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• pp.135-140
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• 2009

A dynamic model to simulate LNG reliquefaction process has been developed. The model was applied to two candidate cycles for LNG reliquefaction process, which are Reverse Brayton and Claude cycles. The simulation was intended to simulate the pilot plant under construction for operation of the two cycles and evaluate their feasibility. According to the simulation results, both satisfy control requirements for safe operation of brazed aluminum plate-fin type heat exchangers. In view of energy consumption, the Reverse Brayton cycle is more efficient than the Claude cycle. The latter has an expansion valve in addition to the common facilities sharing with the Reverse Brayton cycle. The expansion valve is a main cause to the efficiency loss. It generates a significant amount of entropy associated with its throttling and increases circulation flow rates of the refrigerant and power consumption caused by its leaking resulting in lowered pressure ratio. It is concluded that the Reverse Brayton cycle is more efficient and simpler in control and construction than the Claude cycle.

• 설비공학논문집
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• 제6권2호
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• pp.130-139
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• 1994

A cycle analysis was performed for 2-stage expansion Claude refrigerators by a numerical method. The refrigerators are under recent development such that the reciprocating expanders of Collins cycle are replaced by new turboexpanders. A computer simulation program was written to predict the coefficient of performance of the refrigerators for several input parameters. It was found out that there exist unique optimum values for the ratio of expanded mass through the turboexpanders to the total mass and for the intermediate pressure of the 2-stage expansion. The maximum coefficient of performance was about $5{\times}10^{-4}$ at the optimal operation.

• Structural Engineering and Mechanics
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• 제15권4호
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• pp.437-449
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• 2003

The aim of this study is to develop an analytical model of a beam with open cracks and external strengthening which is able to predict its modal scheme components (natural frequencies and mode shapes). The model is valid as far as the excitation level is low enough not to activate non linear effects. The application field of the model are either the prediction of the efficiency of the reinforcement or the non destructive assessment of the structural properties. The degrees of freedom associated to the fault lips must be taken into account in order to introduce the effect of the external strengthening. In a first step, an analytical formulation of a beam with thin notches is proposed according to the references. The model is then extended to incorporate the strengthening consisting in a longitudinal stiffness applied in the vicinity of the cracks. In a second step, the analytical results are compared with these obtained from a finite element simulation.

• Steel and Composite Structures
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• 제3권1호
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• pp.33-46
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• 2003

This study focuses on the influence of a composite external strengthening on the natural frequencies of a steel beam with open cracks. In a first step, the leading parameters associated with the effect of the composite strengthening are experimentally identified. An analytical model is developed in order to quantify the importance of the force transfer within the resin interface. In a second step, the analytical model of a cracked beam with composite external strengthening is compared to experiments.

• 한국수학교육학회지시리즈A:수학교육
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• 제63권3호
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• pp.549-571
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• 2024

디지털·AI 기반 교수·학습이 강조됨에 따라 생성형 AI의 교육적 활용에 대한 논의가 활발해지고 있다. 본 연구는 고등학교 1학년 수학 교과서 5종의 예제와 문제 풀이에 대한 ChatGPT 4, Claude 3 Opus, Gemini Advanced의 수학적 성능을 분석하였다. 총 1,317개 문항에 대해 전체 정답률과 기능별 특징을 살펴본 결과, ChatGPT 4의 전체 정답률이 0.85로 가장 높았고, Claude 3 Opus가 0.67, Gemini Advanced가 0.42 순으로 나타났다. 기능별로는 함수 구하기와 증명하기에서 세 모델 모두 높은 정답률을 보였으나, 설명하기와 그래프 그리기에서는 상대적으로 낮은 정답률을 보였다. 특히 경우의 수 세기에서 ChatGPT 4와 Claude 3 Opus가 1.00의 정답률을 보인 반면, Gemini Advanced는 0.56으로 낮았다. 또한 모든 모델이 벤 다이어그램을 이용한 설명하기와 이미지 생성이 필요한 문제에서 어려움을 겪었다. 연구 결과를 바탕으로 교사들은 각 AI 모델의 강점과 한계를 파악하고 이를 수업에 적절히 활용할 수 있을 것이다. 본 연구는 생성형 AI의 수학적 성능을 분석함으로써, 실제 수학 수업에서의 생성형 AI의 활용 가능성을 제시했다는 점에서 의의가 있다. 또한 인공지능시대의 수학 교육에서 교사의 역할을 재정립하는 데 중요한 시사점을 제공하였다. 향후 생성형 AI와 교사의 협력적 교육 모델 개발, AI를 활용한 개별화 학습 방안 연구 등이 필요할 것이다.

• 한국엔터테인먼트산업학회논문지
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• 제15권4호
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• pp.127-139
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• 2021

본 연구는 전통적 연출 작업에서 벗어나 침묵으로서의 글쓰기를 행하는 프랑스 연출가 끌로드 레지(Claude Régy)의 '침묵의 미학'이 창조해내는 시적 연출을 이탈리아 철학자 조르조 아감벤(Giorgio Agmaben)의 '잠재성'의 개념을 통해 고찰하고자 한다. 끌로드 레지는 연극에서 "근본적으로 중요한 것은 말하고자 하는 바를 말하지 않는 것에 있다"고 설명한다. 그래서 끌로드 레지는 극도의 절제된 미니멀한 수단을 선택하면서 지나치게 느리고 과도하게 분절된 대사가 만들어내는 '침묵'의 무대를 그려내고자 한다. '차라리 ~하지 않는 것을 선호(prefer not to)'하는 바틀비를 통해 자신의 완벽한 잠재성의 주요한 모델로 삼는 아감벤은, 현실태의 '중지' 속에서 비로소 잠재성의 본질이 드러남을 주장한다. 아감벤의 철학에서처럼, 끌로드 레지의 연출 작업은 말과 행동의 '중지'로서 이 침묵은 '행동과 유사성의 모방을 드러내는 현실태로 환원되는 것이 아니라' 비로소 '보이지 않는 것(l'invisible)'이 보이게 되는 순간을 창조해낸다. 이렇듯 끌로드 레지의 연출에서 드러나는 말의 침묵, 어두운 조명과 함께 불분명한 빈 무대의 시각적 침묵은 아감벤에 의해 "비존재를 환대하는" "근본적인 수동성"으로서의 잠재성으로 설명된다. 이런 관점에서 본 연구는 '내용없는 예술가'들에 대한 비판적 관점을 제공하는 아감벤의 '잠재성' 개념과 함께, '느림'과 '침묵'의 미학으로 자신만의 독창적 연출 양식을 창조한 끌로드 레지의 연출 작품, 모리스 메테를링크(Maurice Maeterlinck)의 <내면 L'interieur>과 욘포세(Jon Fosse)의 <누가 올거야 Quelqu'un va venir>를 살펴보면서 동시대, 21세기 연극예술의 또 다른 방향성을 창출해내며 새로운 연출 양식의 지평을 확장시키고자 한다.

• 대한한방내과학회지
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• 제42권5호
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• pp.1054-1061
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• 2021

Objective: The aim of this study was to report the effect of Korean medicine treatment on Claude's syndrome with ataxia and diplopia. Methods: We applied electroacupuncture, scalp acupuncture, and physical therapy to the patient. Diplopia was assessed with the distance between two images of one object, and ataxia was assessed with the Korean Version of the Scale for the Assessment and Rating of Ataxia (K-SARA). Results: After 21 days of treatment, diplopia, abnormal extraocular movement, and ataxia were improved on the basis of the K-SARA score. Conclusion: This case demonstrates the effectiveness of Korean medicine treatment in improving the symptoms of Claude's syndrome.