• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권5호
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• pp.2236-2257
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• 2020

Ransomware is malicious software that encrypts the user-related files and data and holds them to ransom. Such attacks have become one of the serious threats to cyberspace. The avoidance techniques that ransomware employs such as obfuscation and/or packing makes it difficult to analyze such programs statically. Although many ransomware detection studies have been conducted, they are limited to a small portion of the attack's characteristics. To this end, this paper proposed a framework for the behavioral-based dynamic analysis of high survivable ransomware (HSR) with integrated valuable feature sets. Term Frequency-Inverse document frequency (TF-IDF) was employed to select the most useful features from the analyzed samples. Support Vector Machine (SVM) and Artificial Neural Network (ANN) were utilized to develop and implement a machine learning-based detection model able to recognize certain behavioral traits of high survivable ransomware attacks. Experimental evaluation indicates that the proposed framework achieved an area under the ROC curve of 0.987 and a few false positive rates 0.007. The experimental results indicate that the proposed framework can detect high survivable ransomware in the early stage accurately.

• Nuclear Engineering and Technology
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• 제34권5호
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• pp.468-481
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• 2002

There are 4 CANDU6 type reactors operating at Wolsong site. For fuelling operation of certain fuel channels (with flow less than 21.5 kg/s) a FARE flow Assist Ram Extension) device is used. During the refuelling operation, two remote controlled F/Ms (Fuelling Machines) are attached to a designated fuel channel and carry out refuelling job. The upstream F/M inserts new fuel bundles into the fuel channel while the downstream F/M discharges spent fuel bundles. In order to assist fuelling operation of channels that has lower coolant How rate, the FARE device is used instead of F/M C-ram to push the fuel bundle string. The FARE device is essentially a How restricting element that produces enough drag force to push the fuel bundle string toward downstream F/M. Channels that require the use of FARE device for refuelling are located along the outside perimeter of reactor. This paper presents the FARE device design feature, steady state hydraulic and operational characteristics and behavior of the device when coupled with fuel bundle string during fuelling operation. The study showed that the steady state performance of FARE device meets the design objective that was confirmed by downstream F/M C-ram force to be positive.

• Parasites, Hosts and Diseases
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• 제22권2호
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• pp.190-202
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• 1984

In an attempt to clarify the epidemiological feature of distomiasis in Tongjin riverside area, the prevalence of distomiasis in the residents and infection rates of the metacercariae in fresh-water fishes were investigated at the upper, middle and lower reaches of the river from January to April, 1984. The results obtained were summarized as follows: 1. Out of a total of 931 fresh-water fishes which composed of 33 different species, 611 fishes(65.6%) of 31 species were found positive with digenetic trematode metacercariae of 16 different species, and there were some differences in infection rates of the metacercariae among the fishes in the 3 parts of the river; 53.8% in upper, 80.7% in middle, and 61.0% in lower reaches, respectively. 2. Infection rates of the metacercariae of Exorchis oviformis, Metagonimus yokogawai, Echinochasmus japenicus, Metorchis orientalis and Clonorchis sinensis in the fishes were 48%,29%, 115, 7.9% and 6.3oA, respectively. 3. The average number of the encysted larvae of Clonorchis found in fish body/gram showed 4.44 in Pseudorasbera larva, Gnathepegon coreanus (1.2), Microphysogoio yaluensis (0.76), Abbottina springeri (0.4), Acanthorhodeus asmussi (0.21) and Cultriculus eigenmanni (0.17), respectively. 4. The average number of the metacercariae of Metagonimus found in fish body/gram disclosed 34.01 in Zacco platypus, Zacco temmincki (16.46), Carassius carassius (5.35), Moroco oxycephalus (1.54) , Aphyocypris chinensis (1.5) and etc., respectively. 5. Detection rates of the eggs of Clonorchis and Metagonimus among residents were 1.1% and 0.8%, respectively, out of a total 923 Persons.

• 지역사회간호학회지
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• 제17권1호
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• pp.125-133
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• 2006

Purpose: This study was performed to identify the relationship between PMS and sex role. Method: Data were collected from 417 female college students in Seoul and Gyeonggi-do area during the period from the 6th of September to the 15th of October in 2004. Collected data were analyzed using SPSS WIN 11.0. Result: The results of this study were as follows: 1) Perceived subjective symptoms were clustered endogenous depressive feature ($2.76{\pm}.97$), anxiety ($2.76{\pm}1.09$), and impulsivity ($2.72{\pm}1.02$). 2) PMS was significantly different according to the general characteristics of menarche age (F=5.910, p=.003), pain (F=7.886. p=.000) and family history (F=5.366, p=.005), masculinity was significantly different according to menarche age (F=3.174, p=.043), and femininity was significantly different according to menarche age (F=3.742, p=.025) and pain (F=3.256. p=.040). 3) Femininity and PMS were in a positive correlation with each other (r=.623. p=.000). Conclusion: This results showed that there is a significant correlation between PMS and sex role. For future research, it is recommended to identify major factors affecting PMS and the relationships between them and various subjects.

• 한국생산제조학회지
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• 제19권6호
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• pp.889-894
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• 2010

Conventional shrink-fit tool holders have positive features, such as high accuracy, high strength, high stiffness and low sensitivity to centrifugal forces, but they require heavy investments for heating and cooling equipment. Generally the heating equipment has to heat the tool holder up to $200{\sim}300^{\circ}C$ for tool changes. This paper introduces a novel shrink-fit tool holder that is able to unclamp a tool at $40{\sim}50^{\circ}C$. This feature makes it possible to switch between the clamped and unclamped states by using a simple device, which has lower power, smaller size and lower cost than the heating equipment of the conventional shrink-fit tool holders. The proposed shrink-fit tool holder is able to expand its tool hole by using the shape memory alloys which are integrated in the tool holder body. Performances of the SMA shrink-fit tool holder were evaluated experimentally. The experimental results confirm that the proposed tool holder is feasible in aspects of clamping/unclamping operations, clamping force and repeatability of tool setup.

• Asian Pacific Journal of Cancer Prevention
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• 제16권8호
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• pp.3091-3096
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• 2015

Worldwide, breast cancer is the most common malignant neoplasm and the second most common cause of cancer death in women. This malignancy is recognized to be estrogen-dependent and due to this feature, hormone replacement therapy is regarded as potentially dangerous in breast cancer survivors who seek relief of their menopausal symptoms. Whereas hot flashes are detected in nearly half of postmenopausal women with a relatively high frequency and severity, botanic sources of estrogens have been proposed as an alternative treatment. Nevertheless, estrogenic properties of these compounds suggest possibility of stimulating cancer recurrence or worsening prognosis in survivors. As well, effects in improving vasomotor climacteric changes is controversial. Many studies have considered the subject, some focusing on efficacy of phytoestrogens for control of menopausal symptoms, and others discussing effects of these compounds on breast cancer outcome in terms of survival or recurrence. The present article is a concise review of the effects of consumption of phytoestrogens on menopausal symptoms, namely hot flashes, and breast cancer recurrence and mortality in survivors of the disease. Overall, the major part of the current existing literature is in favor of positive effects of phytoestrogens on breast cancer prognosis, but the efficacy on menopausal symptoms is probably minimal at the best.

• The Journal of Asian Finance, Economics and Business
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• 제4권4호
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• pp.39-49
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• 2017

Religious intolerance has become a common feature of many countries in recent times. Studies have revealed a worldwide increase in government regulations and social hostilities against religious beliefs and practices. The stifling impact of both government and society on the market for religion, warrants closer scrutiny. This study examines the relationship between government regulations and social hostilities towards religious beliefs and practices, for the period of 2001-2011 for a sample of 45 European countries. The Generalized Method of Moments dynamic panel estimation technique is employed to analyze the micro panel dataset of 45 European countries, to establish the possible relationships that may exist between these variables. The theoretical framework for this study is based on the Religious Economies Theory and the Supply Side Theory of Religion. The results of this study show evidence of the positive relationship between government regulations and social hostility. Interestingly, the study also revealed that the impact of social hostility on the level of government restrictions is smaller in magnitude compared to the reverse impact of government restrictions on social hostilities, indicating the dangerous role played by governments in inciting social hostilities, when they regulate or restrict religious beliefs and practices.

• 만화애니메이션 연구
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• 통권32호
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• pp.363-381
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• 2013

본 논문은 모바일 웹 상에서 오프라인의 학습 내용을 복습 할 때 학습 동영상에 필요한 재학습 영역을 프레임 단위로 중요 영역만 캡처한다. 캡처된 프레임은 영상 중에서 진행된 학습 시간과 이미지의 형태로 저장하고 또한 설명에 대한 메모 기능을 함께 저장한다. 캡처 영역은 학습자에 필요한 영역만 재학습하는 학습자 중심의 맞춤형 시스템을 적용할 수 있다. 캡처 프로그램의 구성은 학습 순서에 상관없이 선택한 순서에 따라 프레임 단위 캡처로 사용자 중심의 스토리텔링형 학습을 적용할 수 있다. 캡처 시스템 효과는 전체 학습에 비해 학습 시간을 절약하고 학습자 중심의 프레임 재구성으로 맞춤형 학습에 따른 학습 효용성 향상에 긍정적인 역할을 한다.

• Bulletin of the Korean Chemical Society
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• 제29권3호
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• pp.656-662
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• 2008

Antagonists of the d -opioid receptor are effective in overcoming resistance against analgesic drugs such as morphine. To identify novel antagonists of the d -opioid receptor that display high potency and low resistance, we performed 3D-QSAR analysis using chemical feature-based pharmacophore models. Chemical features for d -opioid receptor antagonists were generated using quantitative (Catalyst/HypoGen) and qualitative (Catalyst/HipHop) approaches. For HypoGen analysis, we collected 16 peptide and 16 non-peptide antagonists as the training set. The best-fit pharmacophore hypotheses of the two antagonist models comprised identical features, including a hydrophobic aromatic (HAR), a hydrophobic (HY), and a positive ionizable (PI) function. The training set of the HipHop model was constructed with three launched opioid drugs. The best hypothesis from HipHop included four features: an HAR, an HY, a hydrogen bond donor (HBD), and a PI function. Based on these results, we confirm that HY, HAR and PI features are essential for effective antagonism of the d -opioid receptor, and determine the appropriate pharmacophore to design such antagonists.

• 한국초등과학교육학회지:초등과학교육
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• 제33권3호
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• pp.510-523
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• 2014

Modern society is rapidly changing in the fields of science and technology, with new information and knowledge constantly being discovered. So enhancing the creativity and positive attitude of students is important. STEAM education enables students to develop their creativity, personality, intelligence and sensitivity with a well-balanced curriculum. In this study, considering the student's interest, a theme-centered STEAM program was developed in the 'Strata and Fossils' unit of elementary 4th grade science. The purposes were to find the impact on the academic achievement, creative problem solving abilities, and scientific attitude of elementary school students. The STEAM program are composed of contents which can be applied effectively indoors. As application results for STEAM program to J elementary school's students in J province, the experimental group increased significantly in the academic achievement, creative problem solving abilities and scientific attitude compared to the control group. Therefore, it is necessary to be developed continuous and systematic STEAM programs in units of various subjects to improve the students' academic achievement, creative problem solving abilities and scientific attitude.