• Journal of Radiation Protection and Research
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• v.37 no.3
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• pp.123-128
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• 2012

Evidence suggests that even low-dose irradiation can lead to progressive cognitive decline and memory deficits, which implicates, in part, hippocampal dysfunction in both humans and experimental animals. This study examined whether diethyldithiocarbamate (DDC) could attenuate memory impairment, using passive avoidance and object recognition test, and suppression of hippocampal neurogenesis, using the TUNEL assay and immunohistochemical detection with markers of neurogenesis (Kiel 67 (Ki-67) and doublecortin (DCX)) in adult mice treated with gamma radiation (0.5 or 2 Gy). DDC was administered intraperitonially at a dosage of 1,000 $mg{\cdot}kg^{-1}$ of body weight at 30 min. before irradiation. In passive avoidance and object recognition memory test, the mice, trained for 1 day after acute irradiation (2 Gy) showed significant memory deficits compared with the sham controls. The number of TUNEL-positive apoptotic nuclei in the dentate gyrus (DG) was increased 12 h after irradiation. In addition, the number of Ki-67- and DCX-positive cells were significantly decreased. DDC treatment prior to irradiation attenuated the memory defect, and blocked the apoptotic death. DDC may attenuate memory defect in a relatively low-dose exposure of radiation in adult mice, possibly by inhibiting a detrimental effect of irradiation on hippocampal neurogenesis.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.4
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• pp.457-467
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• 2002

In order to simulate cyber attacks and predict network behavior by attacks, we should represent attributes of network components in the simulation model, and should express characteristics of systems that carry out various cyber attacks and defend from these attacks. To simulate how network load may change under the cyber attacks, we extended SSF[9, 10] that is process-based event-oriented simulation system. We added a firewall class and a packet manipulator into the SSFNet that is a component of SSF. The firewall class, which is related to the security, is to simulate cyber attacks, and the packet manipulator is a set of functions to write attack programs for the simulation. The extended SSFNet enables to simulate a network with the security systems and provides advantages that make easy to port already exsiting attack programs and apply them to the simulation evironment. We made a vitual network model to verify operations of the added classes, and simulated a smurf attack that is a representative denial of sevive attack, and observed the network behavior under the smurf attack. The results showed that the firewall class and packet manipulator developed in this paper worked normaly.

• Maritime Security
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• v.2 no.1
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• pp.1-42
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• 2021

Controversy continues over the offensive nature of China's naval strategy to become a maritime power. Therefore, the purpose of this study is to identify the characteristics of China's naval strategy to become a maritime power by using the three elements of strategy and predict China's military actions in the future. For this purpose, research was conducted by considering the three elements of strategy and the distinct characteristics of naval strategy, and it was found that China's naval strategy was overall aggressive, but there was an imbalance in the pursuit of aggression between each strategic element. Offensive nature was prominent in terms of the methods, but there were limitations in the goals and means, such as the need to cooperate with neighboring countries to become a maritime power and the lack of military technology and operational continuity. The prospects for China's future military actions derived from the imbalance between these strategic elements are as follows. ① The risk of all-out military conflict with the US is low for now. ② China may use its naval power to force or cause limited military clashes against neighboring countries within the first island chain. ③ Accidental military conflicts with the US and neighboring countries may occur over naval confrontation over territorial disputes.

• The Journal of Korean Academy of Prosthodontics
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• v.59 no.3
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• pp.333-340
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• 2021

Although gag reflex is an essential function and a useful physiological defense mechanism, it can become an obstacle in a dental treatment. In this case, a questionnaire was designed and used in consultations to objectify the factors associated with gag reflex. Based on the questionnaire, various treatment protocols were planned, such as behavioral control, which is a systematic desensitization that adapts by placing dental instruments in the oral cavity, and habit control to eliminate vomiting habits after drinking. Except for the placement of the implant fixture under general anesthesia, all restoration procedures were performed in the outpatient clinic in the same manner as the conventional implant fixed prosthetic restoration. The systematic desensitization and behavior technique were repeated until the patient was able to endure discomfort and relieve gag reflex in dental treatment. The patient was successfully received the implant-fixed prosthetic restoration in the partial edentulous region.

• Journal of Radiation Protection and Research
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• v.19 no.2
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• pp.109-120
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• 1994

A method for estimating the effectiveness of each protective action against a nuclear accident has been proposed using the fuzzy set theory. In most of the existing countermeasure models in actions under radiological emergencies, the large variety of possible features is simplified by a number of rough assumptions. During this simplification procedure, a lot of information is lost which results in much uncertainty concerning the output of the countermeasure model. Furthermore, different assumptions should be used for different sites to consider the site specific conditions. Tn this study, the diversity of each variable related to protective action has been modelled by the linguistic variable. The effectiveness of sheltering and evacuation has been estimated using the proposed method. The potential advantage of the proposed method is in reducing the loss of information by incorporating the opinions of experts and by introducing the linguistic variables which represent the site specific conditions.

• Journal of Radiation Protection and Research
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• v.20 no.3
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• pp.163-168
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• 1995

The Radio-frequency electromagnetic(RFEM) spectrum is defined as waves that range in frequency from>0 to $3{\times}1012Hz$. Although there are several thousands of reports that present data or opinion of the biological response to RFEM radiation, no consensus has emerged regarding thresholds and mechanisms of injury. This review presents a overview of the subject on mechanisms of interaction of RFEM fields with tissue, chromosomal and mutagenic effect. carcinogenic effects. The scope of the review is expanded to include systemic effects such as those on reproduction, growth, and development, hematological effects. Some biological end points, those with associated with behavior and cataractogenesis is discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.12
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• pp.1602-1608
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• 2019

In this study, we developed a "Zetton Children's Traffic Safety Education" application using mixed reality to help children experience a variety of traffic situations indirectly and to help them defend themselves from accidents. We analyze the types of high mortality child traffic accidents to set learning goal. And we developed the experience-oriented contents that players could acquire signal systems and traffic information naturally and funny in the course of playing scenarios according to designed various traffic situations. In order to verify the educational effectiveness of the developed application, children were given traffic safety education through after-school education activities. The result shows that the frequency of right answers to questions related to traffic safety awareness and learning objectives is increased.

• Journal of Music and Human Behavior
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• v.10 no.2
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• pp.35-54
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• 2013

The purpose of this study was to examine how Korean music therapy students experience growth under clinical supervision. The investigator conducted in-depth qualitative interviews with 9 students from 3 different universities in Seoul who had at least three semesters of clinical supervision. Data was analyzed using a modified grounded theory approach to construct the growth experience of music therapy supervisees. Results suggest that growth can be understood in terms of both personal and professional domains and includes four types of experiences: growth hindering, fostering, mediating, and revealing. In the personal domain, hindering factors are defensiveness, narcissistic trauma, avoidance and anxiety whereas growth fostering and mediating factors include reflection on self, musical self, unconscious drives and conflicting issues as well as self-driven problem solving skills. As a result, growth in the personal domain is associated with increased self-acceptance and self-awareness. Growth in the professional domain is hindered by having trust issues, performance anxiety, identity crisis, and being hypersensitive to the judgment of others. On the other hand, growth is fostered and mediated by opening the self and interacting more with others, building trusting relationships with peers and supervisors, and establishing a new relationship with music, which leads to improved attitude, increased motivation, and more efficient and effective training.

• Journal of the Korean Society of Marine Environment & Safety
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• v.13 no.4
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• pp.55-63
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• 2007

The Group Digital Surveillance System for Fishery Safety and Security (GDSS-F2S) is to provide the target tracking information and the target identification information in order to secure an huge aquaculture farm-field from a thief. The two information, however, is not enough to indict the thief due to the lack of lawful evidences for the crime actions. To overcome this problem, we consider the target image information as one of solutions after discussion with the effective countermeasure tools for the crime actions with scenario-based analysis according to the geological feature of aquaculture farm-field. To capture the real-time image for the trespassing targets in the aquaculture farm-field area, we developed the image capture system which is consists of ultra sensitive CCD(Charge-Coupled Device) camera with 0.0001 Lux and supplementary devices. As results from the field tests for GDSS-F2S with image capture system, the high definite images of the vehicle number plate and shape, person's actions and features are obtainable not only day time but also very dark night without moon light. Thus it is cleary known that the improved GDSS-F2S with image capture system can provide much enough lawful evidences for the crime actions of targets.

• Proceedings of the KAIS Fall Conference
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• 2011.05b
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• pp.1072-1075
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• 2011

이 연구는 진단용 방사선피폭에 대한 환자 및 종사자의 방사선 인식도, 방사선 지식정도, 방사선 피폭의 유해성, 진단방사선의 필요성, 방사선의 피폭방지, 정보파악의 유무 및 파악경로, 방사선 검사 시 심리적 상태에 영향을 미치는 요인을 살펴보고자 하는 연구이다. 2010년 10월 25일부터 11월 10일까지 일개 광역시 소재하는 종합병원 및 의원에 근무하는 방사선사와 2주내에 진단 방사선을 이용한 해당 의료기관에 내원한 환자를 대상으로 총 347부의 유효설문지를 사용 하였다. 방사선에 대한 인식도에 영향을 미치는 요인으로는 환자의 경우, 직업, 2년내 건강검진 경험, 방사선 피폭에 대한 설명을 들은 경험으로 나타났고, 근무자의 경우, 2년내 교육이수 경험으로 나타났다. 방사선에 대한 지식정도에 영향을 미치는 요인으로는 환자의 경우, 2년내 건강검진 경험으로 나타났고, 근무자의 경우, 연령, 근무기관으로 나타났다. 방사선의 유해성에 영향을 미치는 요인으로는 환자의 경우, 성별, 2년내 건강검진 경험, 정보매체로 나타났고, 근무자의 경우, 근무기관으로 나타났다. 방사선의 필요성에 영향을 미치는 요인으로는 환자의 경우, 월소득, 거주지로 나타났고, 근무자의 경우, 결혼상태, 피폭선량계 착용여부, 환자에게 피폭에 대한 설명을 하는 것으로 나타났다. 방사선 피폭방지에 영향을 미치는 요인으로는 환자의 경우, 직업, 월소득, 2년 내 건강검진 경험으로 나타났고, 근무자의 경우 환자에게 피폭에 대한 설명을 하는 것으로 나타났다. 방사선검사의 심리적 상태에 영향을 미치는 요인으로는 환자의 경우, 방사선에 대한 피폭설명을 들은 경험, 직업으로 나타났고, 근무자의 경우, 연령, 경력, 2년내 교육이수 경험으로 나타났다. 그러므로 방사선 종사자들도 방사선의 위해성에 대한 올바른 인식을 하게 하여 방사선 방어를 적극적으로 할 수 있는 행동을 유도하기 위해서는 이용 방사선의 특성에 맞는 방사선 안전 관리 교육 프로그램의 개발과 방사선 종사자 스스로 방사선에 대한 안전성 확보를 위하여 노력해야 할 것이다.