• Earthquakes and Structures
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• 제16권5호
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• pp.523-532
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• 2019

Different types of gas reservoir such as Liquid Natural Gas (LNG) are among the strategic infrastructures, and have great importance for any government or their private owners. To keep the tank and its contents safe during earthquakes especially if the contents are of hazardous or flammable materials; using seismic protection systems such as base isolator can be considered as an effective solution. However, the major deficiency of this system can be the large deformation in the isolation level which may lead to the failure of bearing system. In this paper, as a solution, the efficacy of an optimally designed combined vibration control system, the combined laminated rubber isolator and rotational friction damper, is investigated to evaluate the enhancement of an existing metal tank response under both far- and near-field earthquakes. Responses like impulsive and convective accelerations, base shear, and sloshing height are studied herein. The probabilistic framework is used to consider the uncertainties in the structural modeling, as well as record-to-record variability. Due to the high calculation cost of probabilistic methods, a simplified structural model is used. By using the Mont-Carlo simulation approach, it is revealed that this combined isolation system is a highly reliable system which provides considerable enhancement in the performance of reservoir, not only leads to the reduction of probability of catastrophic failure of the tank but also decrease the reservoir damage during the earthquake. Moreover, the relative displacement of the isolation level is controlled very well by this combined system.

• Geosystem Engineering
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• 제21권6호
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• pp.326-334
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• 2018

Underground water-sealed gas storage caverns have become the primary method for strategic storage of LPG. Previous studies of excavation blasting effects on large-scale underground water-sealed gas storage caverns are rare at home and abroad. In this paper, the blasting excavation for underground water-sealed propane storage caverns in Yantai was introduced and field tests of blasting vibration were carried out. Field test data showed that the horizontal radial velocity had a major controlling effect in the blasting vibration and frequencies would not cause the vibration velocity concentration effects. In terms of the influence of blasting vibration on adjacent caverns, the dynamic finite element model in LS-DYNA soft was established, whose reliability was verified by field test data. The numerical results indicated the near-blasting side was primary zone for the structural failure and tensile failure tended to occur in the middle of the curved wall on the near-blasting side. Meanwhile, the safety criterions for adjacent caverns based on stress wave theory and according to statistic relationship between peak effective tensile stress and peak particle velocities were obtained, respectively. Finally, with Safety Regulations for Blasting in China (GB6722-2014) taken into account, a final safety criterion was proposed.

• 자원리싸이클링
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• 제30권5호
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• pp.3-9
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• 2021

우리나라에서 연, 아연, 동, 주석, 니켈, 알루미늄 등의 베이스메탈의 수급구조는 양극화된 특성을 지니고 있다. 연, 아연, 동 등은 국내에 세계적 규모의 생산기업이 있는 반면, 주석, 니켈, 알루미늄 등은 국내 생산기업이 전무하거나, 생산량이 미비하여 내수량의 대부분을 수입에 의존하고 있다. 따라서 베이스메탈의 수입중단 또는 국내생산기업의 생산 중단 등의 공급중단에 따른 리스크에 대한 대비가 필요하다. 본 연구에서는 베이스메탈 6종(구리, 연, 아연, 알루미늄, 니켈, 주석)을 대상으로 수입중단 리스크 발생 시 대응이 필요한 물량과 시장이 대응할 수 있는 물량, 정부가 대응해야 하는 물량(전략비축)을 정량화하였다.

• 한국응급구조학회지
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• 제25권1호
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• pp.57-72
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• 2021

Purpose: The purpose of this study was to provide basic data for developing strategic programs based on the types of perception to aid in the coping strategy of 119 emergency medical technicians who experienced have violence. Methods: The subjects were 119 emergency medical technicians working out of hospitals in Korea. Data were collected from March 10, 2019, to June 30, 2019. Q samples of 37 statements and P samples of 36 persons were taken using PC QUANL software. Results: As a result of the study, four types of coping with violence experiences were identified; these four types explained 53.79% of all variables from the examination. The types were labeled as the cooperation seeking and manual emphasis type, emotional suppression and stability seeking type, active response and business continuation type, communication empathy and recovery effort type. Conclusion: The Fire Department requires institutional measures to lower violence during field activities, and it will be necessary to develop a policy according to the type of perception of coping behaviors.

• Asian Journal of Innovation and Policy
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• 제11권1호
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• pp.110-147
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• 2022

Many megacities are exposed to natural hazards such as earthquakes, and when located in coastal regions, are also vulnerable to hurricanes and tsunamis. The physical infrastructures of transportation systems in megacities have become so complicated that very few organizations can understand their response to extreme events such as earthquakes and can effectively mitigate subsequent economic downfalls. The technological advances made in recent years to support these complex systems have not grown as fast as the rapid demand on these systems burdened by population shift toward megacities. The objective of this paper is to examine the risks imposed on and recoveries of transportation systems in megacities as the result of extreme events such as an earthquake. First, the physical damage to transportation infrastructure, loss of the transportation system performance, and the corresponding economic loss from disruptions to passenger and freight traffic is evaluated. Then, traffic flows are re-routed to reduce vehicles' delay due to earthquakes using a microscopic traffic flow simulator with an optimization model and macroscopic terminal simulator. Finally, the economic impact of the earthquake is estimated nationwide. Southern California is regarded as the region of study. The results demonstrate the effectiveness of the integrated model and provide what and how to prepare innovative resilience policies of urban infrastructure for a natural disaster occurrence.

• 디지털산업정보학회논문지
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• 제18권2호
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• pp.111-125
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• 2022

The general view of the division of affiliates of many large corporations is a reorganization of the governance structure, and the smooth division of affiliates is often well wrapped up in a beautiful breakup. However, the parties to the breakup are not only the owners of the company, but all employees as well. Separation of the owner family can be done with joy and good feelings, because they are separated according to the will of the owner family, and each becomes the owner of the company. As Commitment decreases and turnover behavior appears, it is necessary to take a strategic approach to members, along with consideration. This study looked into the recent separation of LG Group's affiliates based on this point of view. To this end, we focused on the case of LX Hausys of LX Group, which was separated from LG Group. To this end, through a meeting with the person in charge of LX Hausys, the company's response to the division was investigated, and FGI was conducted for retired and current members. As a result, it was confirmed through the person in charge that no appropriate measures were taken due to the separation of the company. Through FGI with the retirees and incumbents, the psychological resistance of the members and the decrease in organizational commitment and the increase in turnover intention was confirm.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.39-66
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• 2022

Modern Bulgarian nationalists aspired towards incorporating the self-identified Bulgarian lands into the Bulgarian state. The Treaty of San Stefano ending the Russo-Turkish War of 1877-78 tantalizingly achieved these so-called national ideals. Great Power diplomacy quickly diminished Bulgaria's borders and international legal status with the 1878 Treaty of Berlin, exacerbating nationalist grievances. Bulgaria would expand vast resources to restore the San Stefano borders until Balkan Communist authoritarian regimes eventually suppressed the Macedonian issue as a foreign policy subject. Sofia's policy towards its neighbor has been overdetermined by the efforts of successive Bulgarian governments to institutionalize post-communist Bulgaria's own national identity. Bulgaria's integration into so-called Euro-Atlantic structures, i.e., NATO and the EU, had been the primary strategic objective of the Bulgarian authorities since the end of the Zhivkov regime. North Atlantic community security policy aims in response to the earliest post-Cold War foreign policy crises in the Western Balkans framed the parameters of Bulgarian diplomacy. The stabilization of FYROM in 2001, followed by Bulgaria's 2007 EU accession, led to Bulgarian nationalist values become more salient in Bulgarian politics and foreign policy. Sofia-Skopje relations are a test case for the effects of Europeanization on interdependent Balkan ethno-sectarian nationalisms and state territorial institutional development.

• Molecules and Cells
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• 제46권3호
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• pp.142-152
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• 2023

Nuclear factor erythroid 2-related factor 2 (Nrf2) mediates the cellular antioxidant response, allowing adaptation and survival under conditions of oxidative, electrophilic and inflammatory stress, and has a role in metabolism, inflammation and immunity. Activation of Nrf2 provides broad and long-lasting cytoprotection, and is often hijacked by cancer cells, allowing their survival under unfavorable conditions. Moreover, Nrf2 activation in established human tumors is associated with resistance to chemo-, radio-, and immunotherapies. In addition to cancer cells, Nrf2 activation can also occur in tumor-associated macrophages (TAMs) and facilitate an anti-inflammatory, immunosuppressive tumor immune microenvironment (TIME). Several cancer cell-derived metabolites, such as itaconate, L-kynurenine, lactic acid and hyaluronic acid, play an important role in modulating the TIME and tumor-TAMs crosstalk, and have been shown to activate Nrf2. The effects of Nrf2 in TIME are context-depended, and involve multiple mechanisms, including suppression of proinflammatory cytokines, increased expression of programmed cell death ligand 1 (PD-L1), macrophage colony-stimulating factor (M-CSF) and kynureninase, accelerated catabolism of cytotoxic labile heme, and facilitating the metabolic adaptation of TAMs. This understanding presents both challenges and opportunities for strategic targeting of Nrf2 in cancer.

• 정보보호학회논문지
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• 제33권3호
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• pp.561-575
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• 2023

정보보안 산업은 지난 수십 년간 매우 다양한 성장을 거듭해왔다. 특히 기술적, 관리적, 제도적 측면에서 다양한 해법을 제시해왔다. 그럼에도 불구하고 매년 보안사고는 지속해서 발생하고 있는데 주목해야 한다. 이는기존의 보안이 지나치게 기술 중심, 예방 중심의 정책으로 추진되고 있어서 디지털 시대의 다양한 비즈니스 변화에 한계가 있음을 증명하고 있다. 따라서 최근에 전통적인 보안 접근 방식의 한계를 벗어나고자 인간중심 보안(PCS:People-Centric Security)이 화두가 되고 있다. 본 연구에서는 정보보안 위반의 개념, PCS 전략적원칙, 전문가 인터뷰를 통해 인간이 유발할 수 있는 취약점을 크게 5가지로 구분하고 21개의 세부 구성요소로 분류함으로써 근본적인 보안 사고 대응 방안을 제시하고자 한다.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.191-195
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• 2023

An X-event is an event that is difficult to predict and unlikely to occur, but if it occurs, it has a very large ripple effect, such as loss of life, property, territory, and emotional turmoil. Extreme events are unlikely to occur, but they can happen someday, and if they do, they have a great impact on society as a whole, so they must be prepared to minimize the impact and impact. For this purpose, we collected opinions from low-level experts at the Korea Army Research Center for Future & Innovation and the Army College on extreme events that can trigger the near future (10 years) in the field of high-tech science and technology, which is currently developing rapidly after the 4th Industrial Revolution. The researchers intend to synthesize and analyze this data to derive implications and provide a response direction to alleviate the ultra-uncertainty of extreme events and provide a cornerstone for crisis management strategies for the occurrence of serial and simultaneous extreme events.