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Parametric modeling and shape optimization of four typical Schwedler spherical reticulated shells

  • Wu, J.;Lu, X.Y.;Li, S.C.;Xu, Z.H.;Li, L.P.;Zhang, D.L.;Xue, Y.G.
    • Structural Engineering and Mechanics
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    • v.56 no.5
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    • pp.813-833
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    • 2015
  • Spherical reticulated shells are widely applied in structural engineering due to their good bearing capability and attractive appearance. Parametric modeling of spherical reticulated shells is the basis of internal analysis and optimization design. In the present study, generation methods of nodes and the corresponding connection methods of rod elements are proposed. Modeling programs are compiled by adopting the ANSYS Parametric Design Language (APDL). A shape optimization method based on the two-stage algorithm is presented, and the corresponding optimization program is compiled in FORTRAN environment. Shape optimization is carried out based on the objective function of the minimum total steel consumption and the restriction condition of strength, stiffness, slenderness ratio, stability. The shape optimization of four typical Schwedler spherical reticulated shells is calculated with the span of 30 m~80 m and rise to span ratio of 1/7~1/2. Compared with the shape optimization results, the variation rules of total steel consumption along with the span and rise to span ratio are discussed. The results show that: (1) The left and right rod-Schwedler spherical reticulated shell is the most optimized and should be preferentially adopted in structural engineering. (2) The left diagonal rod-Schwedler spherical reticulated shell is second only to left and right rod regarding the mechanical behavior and optimized results. It can be applied to medium and small-span structures. (3) Double slash rod-Schwedler spherical reticulated shell is advantageous in mechanical behavior but with the largest total weight. Thus, this type can be used in large-span structures as far as possible. (4) The mechanical performance of no latitudinal rod-Schwedler spherical reticulated shell is the worst and with the second largest weight. Thus, this spherical reticulated shell should not be adopted generally in engineering.

Lynching and Ethics in Faulkner's Fiction (포크너 소설에 나타난 린칭과 윤리의 문제)

  • Hwang, Eunjoo
    • Journal of English Language & Literature
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    • v.54 no.2
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    • pp.281-299
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    • 2008
  • The main purpose of this essay is to suggest that Faulkner's "pro"-lynching letter published in Commercial-Appeal in 1931 does not contradict his antilynching works such as "Dry September," Light in August, Go Down, Moses, and Intruder in the Dust. In the letter, Faulkner writes, "they [lynching mobs] have a way of being right." The remark has been interpreted as the expression of Faulkner's sympathetic attitude toward lynching mobs; however, it can be also seen as Faulkner's observation and criticism of the southern white people's structures of feeling in his time that stubbornly justified lynching as a way to do justice to black people who did "not" deserve to be a legal subject. This essay argues that Faulkner understood that the legislation of anti-lynching law alone could not save black people from the violence of lynching as far as white people believed that black people were not their equals and that lynching was a right means to fulfill social justice. Faulkner's fictions such as Light in August and Go Down, Moses provide moments in which white male characters feel as if they were social others, and their experiences work as an ethical urge for them to stand up for social others. This essay illuminates how Faulkner depicts the process of white male characters' identity formation as a violent break from his strong tie with black friends, how they reverse the process to blur the border again through the experiences of becoming-other, and how the experience of becoming-other has a potentiality to play the role of an ethical agency in stopping the custom of lynching in the South.

EMS fund, is it functioning or fumbling? (응급의료기금, 무엇이 문제인가?)

  • Baek, Hong-Seok;Lee, Jun-Ho;Kim, Igic-Sung;Park, Hyun-Suk;Park, Sang-Sub
    • Journal of Korean Clinical Health Science
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    • v.1 no.1
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    • pp.35-45
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    • 2013
  • Purpose. Based on the comparison and analysis with those of United States, the aim of this research is to find the problems in current management, operation and future directions of emergency medical service (EMS) fund in S. Korea and to provide basic resources and appropriate measures to make a right decision in policies for EMS fund. Methods. Data from Ministry of Health and Welfare and other various sources during 1995 to 2012 were collected and analyzed. Results. From our analyses, several problems are identified in EMS fund operation. In brief, problems discerned are as follows. First, whereas the purpose and direction of EMS fund operations in United States are highlighted and focused on pre-hospital EMS system and associated infrastructures which need to be constructed, those of S. Korea are emphasized mainly on the in-hospital EMS system so far. Second, on the contrary to the fact that the EMS funds in United States are tuned to pre-hospital EMS system to provide prompt and efficient emergency care at the emergency scene of pre-hospital stage and to achieve the development, design, planning and demonstration projects for pre-hospital EMS systems, up to date, our investment of EMS funds demonstrated an excess biased inclination toward the construction of in-hospital EMS system, which is far from the realization of constructive and vital pre-hospital infrastructures. Third, while emergency medical technician is important and principal body in the management of emergency medical funds in United States, so far, no EMS funds in S. Korea existed for EMTs including the job condition, improved treatment and working environment for them. Conclusion. In conclusion, we strongly suggest that the problems pointed out must be revised and corrected. Current usage of EMS fund needs to be redirected predominatly to pre-hospital EMS system. Otherwise, unless current management and investment of emergency medical funds in S. Korea are applied and used for the vital necessities and demands of EMTs, public EMS units and private EMS units as well as related units in pre-hospital EMS system as in the cases of United States, in our consideration, they must be suspended or abolished.

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The Legal Study on the Demonstration-on-sea (해상시위의 기본권성과 집시법적용가능성 고찰)

  • Lee Kee-Chun
    • Journal of Navigation and Port Research
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    • v.29 no.3 s.99
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    • pp.235-244
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    • 2005
  • A new type qf demonstrations in the temporal and spacial aspects, such as accidental and unprepared demonstration, urgent assembly, demonstration-on-sea, demonstration-on-highway, and etc., which are not intended in the Law of Assembly and Demonstration, are becoming a social problem Especially, the law on demonstration-on-sea needs to be discussed further because it is not clear if the Law of Assembly and Demonstration is applicable here. If so, how can it be explained logically? Or, if not so, which law should be applied to this context? So far, various theories on demonstration-on-sea have been opposed aggressively vs. submissively. However, it should be guaranteed that the demonstration on sea is one of the constitutional rights based on the self-decision right of demonstration's place. Accordingly, these contents have to be interpreted with a concept of demonstration in Demonstration's law in coordination with the Constitution. Therefore, it is not persuasive that Demonstration's law is analogized, or general police law is applied, to such untypical demonstrations. In addition, taking into consideration a demonstrative function for minority under modem situation of demonstration, it is right to apply the Law of Assembly and Demonstration to the demonstration-upon-sea directly.

A Study on the Problems in Exercising Buyer's Right to Claim Damages for the Breach of Contract by the Seller in International Sales Contract - Focusing on CISG and UNIDROIT Principles(2010) - (국제물품매매계약에서 매도인의 계약위반에 대한 매수인의 손해배상청구권 행사의 문제점 - CISG와 UNIDROIT Principles(2010)을 중심으로-)

  • Oh, Won Suk;Youn, Young Mi;Lim, Sung Chul
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.58
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    • pp.3-33
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    • 2013
  • The purpose of this paper is to examine the problems in exercising buyer's right to claim damages for the breach of contract by the seller in international sales contract and to suggest reasonable counter-measures. The main contents are as follows: First, this author analyzed the principles of the seller's liability for damages in detail and examined the methods for the calculation of damages on the basis of Arts.74~77. As these articles are found to be insufficient in practical application, this author further examined the UNIDROIT Principles(2004) to confirm whether these Principles can fill the gaps of CISG or not, which turned out their gap-filling functions. Second, this author tried to find any expected problems when the buyer resorts to the right to claim damages in case of the seller's breach of contract including the estimation of damages, the burden of proof, causation, the proof of appropriateness for avoidance, the proof of buyer's obligation to mitigate the loss and so on. The reason is that these problems may cause a lot of difficulties in real business. As result, many buyers have given up their reasonable rights to claim damages so far. Finally, from the buyer's perspective, this author would like to suggest a liquidated damage clause(LD Clause) which gives the buyer to received a specified sum in case of seller's non-performance and/or a demand guarantee(or standby L/C) which guarantees buyer to secure unconditional payment independent of the underlying contract. For these purposes, the buyer should try to insert the LD Clause and/or Guarantee Clause in the contract when the buyer and the seller negotiate the sales contract. Also there are a lot of considerations and limitations in using the LD Clause and the Guarantee Clause in their real business, mainly dependent up bargain power between the seller and the buyer, for which this author promise to examine in detail in the future.

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A Study on Improvement of Site Selecting Indicators for Safe Pedestrian Environment (안전한 보행환경 사업 대상지 선정지표 개선방안 연구)

  • Lee, Jong Nam;Heo, Joon;Cho, Won Cheol;Lee, Tae Shik
    • Journal of Korean Society of Disaster and Security
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    • v.6 no.1
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    • pp.79-86
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    • 2013
  • As car-oriented road policies have been made forward so far, relatively pedestrians' walking conditions are so in poor environments that more than two thousand pedestrians die from car accidents every year. Pedestrians' walking right has been severely invaded like that. Pedestrians' walking right is a right that people are able to walk safely and comfortably in pleasant surroundings as long as they don't threaten the public safety, order maintenance, and welfare. The government has an obligation to provide safe, comfortable, and pleasant environments to pedestrians. Recently interests in pedestrians' safety are increasing, government-driven supports have been made to make safe, pleasant, and healthy walking surroundings. As poor walking condition improvement projects cost high, they should be progressed to accomplish maximal effects using finite finances efficiently, and post feasibility evaluations of the projects should be severely estimated. However site selecting indicators which satisfy with the goal for composing safe working surroundings have not been decided yet, though currently it has a legal basis to specify walking condition improvement sites by the Law for Pedestrians' safety and Comfort Increasement. Therefore this study focuses on suggesting improved ways for selecting sites where pedestrians' safe environment project by reviewing previous research. When project sites are selected, evaluation indicators related to awareness survey of residents and history should be excluded, and disaster safety assessments for walking safety facilities, latent human hazards and natural disasters like a strong wind are proposed besides evaluations on pedestrians' safety and walking environment for matching with the purpose of the project to make safe working surroundings.

A Study on the Buyer's Duty to Mitigate Seller's Damages in CISG (CISG상의 매수인의 손해경감의무에 관한 고찰)

  • HA, Kang-Hun
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.66
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    • pp.1-23
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    • 2015
  • A party who relies on a breach of contract must take such measures as are reasonable in the circumstances to mitigate the loss, including loss of profit, resulting from the breach. Appropriate measures are those aimed at lessing the loss as far as reasonably possible. Such measures will typically be a resale of the goods by the seller or a cover purchase by the buyer. The measures the injured party is expected to take in order to mitigate the loss must be reasonable in the circumstances. Article 77 will be applied to the difference between the amount by which the loss should have been mitigated under Article 77. A reduction of damages is the only remedy available to the party in breach in cases covered by Article 77. If the buyer has received the goods and intends to exercise any right under the contract or this Convention to reject them, he must take such steps to preserve them as are reasonable in the circumstances. If goods dispatched to the buyer have been placed at his disposal at their destination and he exercises the right to reject them, he must take possession of them on behalf of the seller. Article 86(1) requires that the buyer manifest his intention at the moment of receipt of the goods. Article 86(2) envisages that the goods have been dispatched to the buyer and that they have been placed at his disposal at their destination. Article 87 allows him to deposit them in the warehouse of a third person. It is not necessary that the warehouse by public, or that it be a general warehouse for storage. A party who is bound to preserve the goods in accordance with articles 86 may sell them by any appropriate means taking possession of the goods or in taking them back or in paying the price or the cost of preservation. If the goods are subject to rapid deterioration or their preservation world involve unreasonable expense, a party who is bound to preserve the goods must take reasonable measures to sell them. A difference exists between paragraph Article 88 (1) which grants the right to sell, and paragraph (2 )which imposes the duty to take reasonable measures to sell the goods. According to Article 88(2), the party who wishes to sell must give notice to the other party of such intention, to the extent possible.

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Kinematical Analysis of Basket with 1/2 Turn to Handstand on Parallel Bars (평행봉 Basket with 1/2 Turn to Handstand 기술 분석)

  • Back, Jin-Ho;Park, Jong-Chul;Lee, Yong-Sik
    • Korean Journal of Applied Biomechanics
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    • v.17 no.1
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    • pp.165-174
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    • 2007
  • The subject of this study was male apparatus gymnastics athlete who had scored high points doing basket with 1/2 turn on parallel bars. Then 3D motion analysis were used to calculate & analyse kinematic variables of Basket with 1/2 turn to Handstand. 1. The total average time spent for Basket with 1/2 turn took $2.16{\pm}.08sec$, at the downward upward phase took $.58{\pm}0.00sec$, $.23{\pm}.00sec$, at flight phase took $.28{\pm}.01sec$, at connected area phase took $.72{\pm}0.21sec$, at rotation area phase took $.35{\pm}.14sec$. To have a successful performance, there should be faster speed and velocity to rotate at the downward upward phase, then the upward velocity and height must be used adequately. Moreover, the speed must be faster at the flight connect phase to stabilize Center of Mass(CM) for the body, and must secure more time at the rotation area to have more stable performance. 2. After handstand on parallel bars while moving CM to right hand side, and It must be performed with big and magnificent performance with putting both hand's center to far away from the parallel bars. 3. Furthermore, CM must be moved fast from downwards to right hand side, and CM must be moved fast in vertical movement at upward and flight phase to avoid CM from moving back and forth, and left and right. 4. At downwards, the subject must rotate as bis as possible using hip-joint as wide as possible and at upwards, must put his body to vertical to have stable performance. While rotating or turning, it is better to do with bigger shoulder angle and have to make sure that trunk angle must be not scattered. To perform better and more positive in basket with 1/2 turn on parallel bars, the centrifugal force must be used big and fast at downward, and at upward and flight phase, downward movement must change to vertical movement as soon as possible while turning movement must happen at handstand position. Time spent must be shorten at connected area to stabilize CM and turning must be natural as possible while securing the necessary time of movement to well-balanced. Also, the body must be vertically closed from the ground.

A Case of Erdheim-Chester Disease Who Has Policythemia Vera (진성 적혈구증다증 환자에서 발현한 Erdheim-Chester Disease 1예)

  • Kim, Ji Eun;Lee, Hyun Jeong;Rhee, Chin Kook;Yoon, Hyung Kyu;Song, Jeong Sup
    • Tuberculosis and Respiratory Diseases
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    • v.64 no.3
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    • pp.224-229
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    • 2008
  • Erdheim-Chester disease (ECD) is a rare disease that is characterized by multi-organ involvement of foamy histiocytes. It causes systemic inflammation, and also demonstrates various clinical manifestations and has a poor prognosis. We encountered a case of ECD in a patient that had been treated for underlying polycythemia vera. As far as we know, this is the first reported case worldwide where ECD developed in association with polycythemia vera. A 59-year-old man visited our hospital due to pleuric pain at the right side of the chest. Pleural tissue that was obtained following a thoracoscopic biopsy showed non-Langerhan's cell histiocytosis, suggesting the presence of ECD. The histiocytes stained positively for CD68, but were negative for S-100 and CD1a. The patient also complained of pain at both hips and the right shoulder area. An X-ray and magnetic resonance image demonstrated that the lesion showed sclerosis and osteolysis in both the proximal femur and right humerus. Treatment was started with predinisolone, and subsequently cyclophosphamide was added. ECD is a very rare multi-systemic disease, and its cause and therapeutic options have not yet been defined. ECD has a poor prognosis. Therefore, we believe that additional case studies are needed prior to the determination of a novel therapy for ECD.

A Study on the Function of Social Security of Democracy (민주주의(民主主義)의 사회안전관리 기능에 대한 고찰)

  • Gong, Bae-Wan
    • Korean Security Journal
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    • no.4
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    • pp.5-27
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    • 2001
  • This study analyzes the social function of democracy and the essential problems of social security of democracy. So far democracy has used a political term in politics. Democracy allows us the right to the freedom of individuality and social equality. Even scholars however, neglect to study about the criticism of democracy and social problems that are caused by democracy. It was expected that democracy would be valued by humans throughout the world. People have been fighting to establish a reliable political system of democracy. So they can have security in their society and the subject of politics. Therefore, We should consider study on democracy in function of democracy in relation to security of society and essential problems on what is democracy? Does democracy change with social change? Didier Bigo said, 'rising of freedom cause rising of a social unrest', B. Jeanneau said 'Democracy itself is the starting of social discord'. These are criticism of social security, the system and the function of democracy. It especially explains social discord and unrest that has occurred by an authoritative interpretation of democracy or the meaning of a word interpretation. It is a question of the day that it's converse the function of the system and the operation of democracy, act as social unrest.

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