• Bulletin of the Korean Chemical Society
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• v.24 no.1
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• pp.23-26
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• 2003

Titanium acetylacetonate was used in the construction of a PVC-based membrane electrode. This sensor shows very good selectivity for iodide ion over a wide variety of common inorganic and organic anions. It exhibits Nernstian behavior with a slope of 59.1 mV per decade. The working concentration ranges of the sensor are with a detection limit of $3.0\;{\times}\;10^{-6}\;M$. The response time of the sensor is very fast (<8 s), and can be used for at least twelve weeks in the pH range of 4.0-9.2. The best performance was obtained with a membrane composition of 30% PVC, 65% dibutylphthalate, 3% titanium acetylacetonate and 2% hexadecyltrimethylammonium bromide. The proposed sensor was successfully applied as an indicator electrode for titration of iodide with silver ion.

• Structural Engineering and Mechanics
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• v.44 no.4
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• pp.417-429
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• 2012

Taking the superficial temperature increment as the major fatigue damage indicator, the infrared thermography was used to predict fatigue parameters (fatigue strength and S-N curve) of welded joints subjected to fatigue loading with a high mean stress, showing good predictions. The fatigue damage status, related to safety evaluation, was tightly correlated with the temperature field evolution of the hot-spot zone on the specimen surface. An energetic damage model, based on the energy accumulation, was developed to evaluate the residual fatigue life of the welded specimens undergoing cyclic loading, and a good agreement was presented. It is concluded that the infrared thermography can not only well predict the fatigue behavior of welded joints, but also can play an important role in health detection of structures subjected to mechanical loading.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1996.03a
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• pp.165-169
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• 1996

In this study residual stress in weldment was considered about the effect on the fatigue propagation and about the effect of redistribution of residual stress. Then, fatigue tests were conducted by the center notched specimens machined with welded plate. The residual stress and its redistribution after the crack growth were measured by the magnetizing stress indicator and hole-drilling method. Fatigue crack propagation was estimated by the specimens having residual stress redistributed after the cracks growth and having the effects of crack closure. Crack growth rates were predicted and compared with experimental results. It had been found that the predicted crack propagation rates have a good agreement with experimental results when the redistribution of residual stress was considerd.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06b
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• pp.328-332
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• 2010

교통사고는 운전자, 차량, 주변 교통상태, 도로 및 교통시설 등의 여러 요인이 복합적으로 작용하여 발생하지만, 많은 경우 운전자의 운전 행태가 가장 큰 영향을 미친다. 본 논문은 이러한 운전자의 운전 행태를 분석하여 점수화 하여 보여줌으로써 운전 행태를 개선할 수 있도록 도와주는 정숙 운전 지수 표기기 개발에 관한 것이다. 연구에서는 MEMS 기반 3차원 가속도 센서와 3축 지자기 센서, GPS 등 모션 센서들을 이용하여 운전 안정성 / 승차감 지수를 측정, 저장하고 정량적으로 보여 줌으로써 운전자의 운전습관을 개선할 수 있도록 해 준다. 실제 구현에는 정숙 운전 지수 계산에 필요한 모든 센서를 이미 포함하고 있는 아이폰을 이용하였으나, 내비게이션 시스템이나, 차량용 블랙 박스 등에 최소한이 센서를 부가 장착함으로써 적용이 가능하다.

• Journal of Korean Clinical Health Science
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• v.6 no.2
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• pp.1097-1105
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• 2018

Purpose: Loneliness is an extremely subjective experience that is influenced by life experiences and circumstances. This study attempted to provide basic data for the development of nursing intervention strategies to understand the concept of loneliness and to reduce loneliness on various topics. Methods: The research analysis method is based on the framework of concept analysis proposed by Walker and Avant (1988). Results: The results of this study are as follows: 1) Self-alienation 2) Isolation of human beings 3) Psychological damage reaction 4) Pain 5) Loneliness is the loss of a comfortable "frame". The prerequisites can be divided into personal characteristics and situational characteristics. Empirical criteria include intimate others, lack of social relationships or problems, family and friendship, belonging, recognition or expression of loneliness, emotional state changes and changes in health behavior, and physical symptoms. Conclusions: Loneliness is an important indicator of well-being and a cause of physical and mental illnesses, so nurses facing various subjects should be able to recognize the signs and symptoms of loneliness. By promoting and sustaining their interest, they should be able to enjoy lonely people.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.248-251
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• 2015

High injury and fatality rates remain a serious problem in the construction industry. Many construction injuries and fatalities can be prevented if workers can recognize potential hazards and take actions in time. Many efforts have been devoted in improving workers' ability of hazard recognition through various safety training and education methods. However, a reliable approach for evaluating this ability is missing. Previous studies in the field of human behavior and phycology indicate that the visual focus of attention (VFOA) is a good indicator of worker's actual focus. Towards this direction, this study introduces an automated approach for estimating the VFOA of equipment operators using a head orientation-based VFOA estimation method. The proposed method is validated in a virtual reality scenario using an immersive head mounted display. Results show that the proposed method can effectively estimate the VFOA of test subjects in different test scenarios. The findings in this study broaden the knowledge of detecting the visual focus and distraction of construction workers, and envision the future work in improving work's ability of hazard recognition.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.31 no.4
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• pp.1-6
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• 2023

EBT has designed and implemented a training program that relies on evidence from events such as Flight Operation Quality Assurance (FOQA), accidents, and incidents specific to each airline. The goal is to enhance the overall skills of the flight crew. This involves assessing the capabilities of individual crew members and, based on the findings, providing additional training to address any shortcomings. To create a training program aligned with the objectives of EBT, this study focused on analyzing data from hard landing incidents in domestic airlines obtained through FOQA events. A practical EBT training program was then developed, specifically targeting adverse weather conditions. The program evaluates landing capabilities, and the results guide the supplementation of any deficiencies in the landing skills of each flight crew member, ultimately aiming to enhance their confidence.

• Journal of Oral Medicine and Pain
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• v.48 no.4
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• pp.137-143
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• 2023

Purpose: To assess Google Trends (GT) search behavior regarding orofacial pain (OFP) and headaches. Methods: GT scores for OFP and headache specialists between February 2013 and December 2022 were analyzed. Statistical tests such as Poisson regression analyses, mean differences, and Cohen's D were used to assess the score change over time. Results: The top three search words for OFP specialists were "temporomandibular joint (TMJ) specialist," "TMJ doctor," and "TMJ dentist," whereas the top three search words for headache specialists were "Headache specialist," "Headache doctor," and "Migraine specialist." Here, TMJ is temporomandibular joint. The GT scores for OFP specialists increased significantly (p<0.05) for all years except 2017, with the highest mean difference in 2020. The scores for headache specialists showed similar trends but gradually. Conclusions: The interest in OFP and headache specialists expressed by Google searches has increased over the years. More awareness is needed regarding the OFP scope of practice, and the use of GT may serve as an indicator.

• Journal of the Korean Society for Railway
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• v.20 no.1
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• pp.156-163
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• 2017

In the major operation sections of the urban railway, there has been habitual delay, and delay propagation; another problem is the increase of crowds and of inconvenience to passengers. The urban railway has different characteristics from rural railways, such as uncertainty of demand and irregularity of train operation. In urban railways, recently, operators manage quality indicators of service using operation results, such as the delay of train operation and the congestion of trains. However, because the urban railway has characteristics in which demand, passenger behavior, and train operation mutually affect each other, it is difficult to express the quality of service that passengers actually feel. In this paper, we suggest a quality indicator of service from the viewpoint of passengers, and present a demand responsive multi-train simulation method to predict dynamic dwell time and train operation status; we also use simulation results to consider changes in the quality indicator of service.

• Asian Pacific Journal of Cancer Prevention
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• v.17 no.8
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• pp.3735-3737
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• 2016

Background: The purpose of this study is to evaluate if there is a relation between platelet: lymphocyte ratio (PLR) and neutrophil lymphocyte ratio (NLR) values and tumour histology and spread in bladder cancer cases. Materials and Methods: Bladder cancer patients undergoing TUR-M operation, with histopathologically verified diagnosis, followed-up and treated at the Private Medical Park Gaziantep Hospital between 2010 and 2015, have were included in the study. NLR and PLR values were calculated using complete blood count data obtained at the first presentation. Results: A total of 99 patients were included in the study, 7 (7.1%) women and 92 men (92.9%). When NLR was used as the indicator of systemic inflammatory response (SIR), it was determined that, 52 (52.5%) of the patients were SIR negative and 47 (47.5%) SIR positive. No significant relation could be detected between NLR and tumour grade and muscle invasion (p=0.948, p=0.480). When PLR was used as SIR indicator, it was determined that 71 (71.7%) of the patients were found as negative and 28 (28.3%) as positive. No significant relation could be detected between PLR and tumour grade and muscle invasion (p=0.651, p=0.494). Conclusions: In our study we did not detected a relation between tumour histological behavior and PLR and NLR in bladder cancer. However, NLR and PLR are easily calculated, accessible, inexpensive and simple-to-use laboratory data from whole blood counts.