• Journal of Korean Society of Steel Construction
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• v.24 no.3
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• pp.289-299
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• 2012

The goal of this paper is to apply the multi-step Taylor method to a space truss, a non-linear discrete dynamic system, and analyze the non-linear dynamic response and unstable behavior of the structures. The accurate solution based on an analytical approach is needed to deal with the inverse problem, or the dynamic instability of a space truss, because the governing equation has geometrical non-linearity. Therefore, the governing motion equations of the space truss were formulated by considering non-linearity, where an accurate analytical solution could be obtained using the Taylor method. To verify the accuracy of the applied method, an SDOF model was adopted, and the analysis using the Taylor method was compared with the result of the 4th order Runge-Kutta method. Moreover, the dynamic instability and buckling characteristics of the adopted model under step excitation was investigated. The result of the comparison between the two methods of analysis was well matched, and the investigation shows that the dynamic response and the attractors in the phase space can also delineate dynamic snapping under step excitation, and damping affects the displacement of the truss. The analysis shows that dynamic buckling occurs at approximately 77% and 83% of the static buckling in the undamped and damped systems, respectively.

• The Journal of the Korea Contents Association
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• v.10 no.2
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• pp.295-305
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• 2010

The occupational socialization process of security and secretary service goes through four stages of preparation, adaptation, conflicts, and maturity and dynamic and incessant changes. The preparation stage includes the preparation to become a security and secretary service, the importance of what to prepare, usefulness of college education, required courses, and certificates. The adaptation stage includes the percentage of bodyguard and secretary, systematic nature of work, stagnation of the job, abilities required for a security and secretary service, elements to work on, job satisfaction, information sources, professionalism of the job, and future of the job. In the conflicts stage includes conflicts at work, difficulty of security and secretary service, problem-solving efforts, advice and consultation, satisfaction with workload, job stress, perceptions of others for security and secretary service, experience of trying to get another job, and supplements. And the maturity stage includes the changes to the roles and capabilities of a security and secretary service, autonomy of business management, degree of others' recognition of one's abilities, methods to evaluate job performance, salary, social status and pride, and efforts for self-development.

• Journal of the Korean Society of Radiology
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• v.4 no.3
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• pp.19-25
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• 2010

Dysphagia is common and serious problems in post-stroke patients. The post-stroke dysphagia with aspiration is associated with dehydration, malnutrition, pneumonia, sepsis and death. Up to date, gag reflex and choking history used to decide the aspiration in clinical. The purpose of this study was to evaluate the aspiration and to choice the proper meal formation using by video fluoroscpic swallowing study(VFSS) with post-stroke dysphagia patients. 58 post-stroke patients and ten normal person participated to perform the VFSS with liquid type, puding, yoplait, rice mixed with barium(Ba). Two rehabilitation medicine doctors and a radiological technologist analysed the phase(oral, pharyngeal, esophageal phase)with video film, and checked the pharyngeal transition time(PTT). 38 patients showed abnormality in pharyngeal phase, 13 patients in oral and pharyngeal phase, 3 patients in oral phase, and 2 patients in pharyngeal and esophageal phase. 43 patients(65.2%) occured the aspiration, but 23 of 43 patients improved by the chin tuck position. Aspiration occured 34 patients in liquid type, 2patients in rice gruel and nothing in boiled rice. After VFSS, 13 of 23 patients change the intaking pathway from nasogastric tube(NGT) to oral, On the contrary with 3 of 42 patients from oral to NGT. Consequently VFSS is clearly effective to evaluate the aspiration with post-stroke dysphagia patients.

• Investigative Magnetic Resonance Imaging
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• v.5 no.2
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• pp.116-122
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• 2001

Purpose : To find sensitivity of MRI imaging methods to slow flow phantom study was performed with conventional Spin-Echo, gradient echo based Phase Contrast, fast GRASS, and heavily T2-weighted Fast Spin Echo pulse sequences. Materials and Methods : A siphon driven flow phantom was constructed with a ventriculo-peritoneal shunt catheter and a GE phantom to achieve continuous variable flow. Four different pulse sequences including Spin-Echo, Phase Contrast, GRASS and Heavily T2-weighted Fast Spin Echo were evaluated to depict slow flow in the range from 0.08 ml/min to 1.7 ml/min and to compare signal intensities between static fluid and flowing fluid. Results : In the slow flow above 0.17 ml/min conventional Spin-Echo showed superior apparent contrast between static and flowing fluid while GRASS was more sensitive to the very slow flow below 0.17 ml/mim. It was not accurate to calculate flow and velocity below 0.1 ml/min with a modified PC imaging. Conclusion : Four different MR pulse sequences demonstrated different sensitivity to the range of slow flow from 0.08 ml/min to 1.7 ml/min. This finding may be clinically useful to measure CSF shunt flow or detecting CSF collection and thrombosis.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.2
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• pp.243-254
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• 2017

Recently, discussions about the guarantee of smart ecological environment have been started in S. Korea. These discussions are becoming more and more popular in the aspect of ubiquitous administrative spatial informatization in utilization using big data as a new paradigm due to the rapid change of information and communication technology, such as the start of smart society and the ubiquitous era. In addition, there is a growing interest in discussing environmental and disaster preservation in terms of ubiquitous smart city construction in smart society. In thisstudy, by applying 'scenario planning' as a foresight method, we have developed a desirable future vision for ubiquitous administrative spatial informatization in terms of preservation of disaster of Kori nuclear power plant like earthquake. In order to establish a high level of city disaster prevention level in S. Korea in 2030 when the big data and big data System will be further intensified in the future, it is necessary to develop advanced ICT city disaster prevention system with big data administrative spatial informatization in terms ofsmart ecological city construction.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.6
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• pp.567-580
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• 2016

In recent years, our society, because of the arrival of a new paradigm according to the rapid changes in ICT has entered into future smart society and the ubiquitous era. So it can be a notable turning point in the marine disaster prevention system with big data, aspects of the era change. Therefore, this study was to derive a desirable vision for the big data marine disaster prevention informatization in terms of ICT maritime disaster prevention system development as preparedness for the maritime disaster by applying 'scenario planning' as a foresight method. Soon this study derived a successful marine disaster prevention informatization strategy as preparedness for the maritime disaster like Ferry Sewol Disaster. It proposed the big data marine disaster prevention informatization system with the use of the administrative aspects of information with spatial informatization as big data information. Also this study explored the future leadership strategy of the big data marine disaster prevention informatization in smart society. Eventually in 2030 to around, In order to still remain our marine disaster prevention informatization as a leading ICT nation, this study suggested the following strategy. It is important to ready the advanced Big Data administrative spatial informatization system In terms of prevention of incidents like Ferry Sewol Disaster.

• The KIPS Transactions:PartD
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• v.16D no.1
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• pp.113-122
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• 2009

Since the traditional pattern mining methods only probe unspecified moving patterns that seem to satisfy users' requests among diverse patterns within the limited scopes of time and space, they are not applicable to problems involving the mining of optimal moving patterns, which contain complex time and space constraints, such as 1) searching the optimal path between two specific points, and 2) scheduling a path within the specified time. Therefore, in this paper, we illustrate some problems on mining the optimal moving patterns with complex time and space constraints from a vast set of historical data of numerous moving objects, and suggest a new moving pattern mining method that can be used to search patterns of an optimal moving path as a location-based service. The proposed method, which determines the optimal path(most frequently used path) using pattern frequency retrieved from historical data of moving objects between two specific points, can efficiently carry out pattern mining tasks using by space generalization at the minimum level on the moving object's location attribute in consideration of topological relationship between the object's location and spatial scope. Testing the efficiency of this algorithm was done by comparing the operation processing time with Dijkstra algorithm and $A^*$ algorithm which are generally used for searching the optimal path. As a result, although there were some differences according to heuristic weight on $A^*$ algorithm, it showed that the proposed method is more efficient than the other methods mentioned.

• Journal of International Area Studies (JIAS)
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• v.22 no.1
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• pp.161-202
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• 2018

The purpose of this study is to analyze the ex-post evaluation reports of KOICA's grant aid project in terms of criteria, methods, and contents. To this end, we will examine the evaluation history and process with particular reference to EDCF and KOICA. Our key research questions are: 1) How are the evaluation standards of the OECD DAC reflected in the KOICA ex-post evaluation reports? 2) Whether did Korea's practices of development evaluation change after its entry into the OECD DAC. The paper attempted an content analysis on the key words used in findings and recommendation section of the reports since 1998 that ara available on the website of KOICA. The main results can be summarized as follows. First, the frequency of OECD DAC criteria(relevance, efficiency, effectiveness, impact, sustainability) and the use of quantitative methods have been increasing after joining the OECD DAC. Second, in the ex-post evaluation reports issued after 2010, the reference indices including the Project Design Matrix (PDM), baseline data, and performance have increased exponentially.

• Journal of Korea Entertainment Industry Association
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• v.15 no.4
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• pp.187-206
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• 2021

The purpose of this study is to analyze the compositions and characteristics in cultural programs of the 1988 Seoul Olympics and the 2018 PyeongChang Winter Olympic Games. A research method was considered the developmental aspects of Cultural Olympics in all-time Olympic Games and the cases of Cultural Olympics in a host country through a documentary research method. The compositions and characteristics in cultural programs of the 1988 Seoul Olympics and the 2018 PyeongChang Winter Olympic Games were diversely analyzed. The results are as follows. First, a concept of a cultural program was deepened and developed at the 1992 Barcelona Olympics. In the wake of the 2010 Vancouver Olympics, IOC published the Cultural Olympic Guide. Through the 2012 London Olympics, the Cultural Olympic Guide was revised. Second, the cultural programs of the 1988 Seoul Olympics and the 2018 PyeongChang Winter Olympic Games showed the characteristics of image change & status and of the international exchange strengthening in a host country and a holding city. Third, in terms of cultural programs, the 1988 Seoul Olympics comprised the celebrations, performances & exhibitions amid the Culture and Arts Festival, and the International Academic Conference. The 2018 PyeongChang Winter Olympic Games were composed of performances, exhibitions, festivals, humanities & experience, and educational events. Fourth, the 1988 Seoul Olympics included the key element of forming a program that equally has the characteristics with the harmony between tradition and modernity, with the promotion of the excellence in Korean traditional culture & the spread in a bond of sympathy, and with various cultures and arts in each region. Also, the 2018 PyeongChang Winter Olympic Games pushed ahead with the strategy dubbed 'The Olympics in which there is culture day after day, in which provincial residents participate, and in which the cultural heritage is left' in order to systematically expedite the cultural Olympics.

• Progress in Medical Physics
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• v.24 no.2
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• pp.127-132
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• 2013

The position of the internal organs can change continually and periodically inside the body due to the respiration. To reduce the respiration induced uncertainty of dose localization, one can use a respiratory gated radiotherapy where a radiation beam is exposed during the specific time of period. The main disadvantage of this method is that it usually requests a long treatment time, the massive effort during the treatment and the limitation of the patient selection. In this sense, the combination of the real-time position management (RPM) system and the volumetric intensity modulated radiotherapy (RapidArc) is promising since it provides a short treatment time compared with the conventional respiratory gated treatments. In this study, we evaluated the accuracy of the respiratory gated RapidArc treatment. Total sic patient cases were used for this study and each case was planned by RapidArc technique using varian ECLIPSE v8.6 planning machine. For the Quality Assurance (QA), a MatriXX detector and I'mRT software were used. The results show that more than 97% of area gives the gamma value less than one with 3% dose and 3 mm distance to agreement condition, which indicates the measured dose is well matched with the treatment plan's dose distribution for the gated RapidArc treatment cases.