• Imaging Science in Dentistry
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• 제42권1호
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• pp.61-64
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• 2012

Keratocystic odontogenic tumor (KCOT) is a benign odontogenic tumor with a potentially aggressive and infiltrative behavior. KCOT is most commonly occurred in mandible and demonstrate a unilocular, round, oval, scalloped radiolucent area, while large lesions may appear multilocular. An important characteristic of KCOT is its propensity to grow in an antero-posterior direction within medullary cavity of bone causing minimal expansion. Definitive diagnosis relies on histological examination. In this report, a KCOT that had an expansion both buccal and lingual cortical bone is described including its features in computed tomography and ultrasonographic exams. The lesion was removed surgically via an intraoral approach under local anesthesia and histologically reported as a KCOT.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 제33회 추계학술대회논문집
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• pp.191-196
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• 2009

Experiments were conducted in a constant pressure combustion chamber using schlieren system to investigate the effects of carbon dioxide/nitrogen/helium diluents on cellular instabilities of syngas-air premixed flames at room temperature and elevated pressures. Laminar burning velocities and Markstein lengths were calculated by analyzing high-speed schlieren images at various diluent concentrations and equivalence ratios. Experimental results showed substantial reduction of the laminar burning velocities and of the Markstein lengths with the diluent additions in the fuel blends. Effective Lewis numbers of helium-diluted syngas-air flames increased but those of carbon dioxide- and nitrogen-diluted syngas-air flames decreased in increase of diluents in the reactant mixtures. With helium diluent, the propensity for cells formation was significantly diminished, whereas the cellular instabilities for carbon dioxide-diluted and nitrogen-diluted syngas-air flames were not suppressed.

• 한국수소및신에너지학회논문집
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• 제15권1호
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• pp.12-22
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• 2004

In order to evaluate the potential of partial hydrocarbon substitution to improve the safety of hydrogen use in general and the performance of internal combustion engines in particular, the outward propagation and development of surface cellular instability of spark-ignited spherical premixed flames of mixtures of hydrogen, hydrocarbon, and air were experimentally studied at NTP (normal temperature and pressure) condition in a constant-pressure combustion chamber. With propane being the substituent, the laminar burning velocities, the Markstein lengths, and the propensity of cell formation were experimentally determined, while the laminar burning velocities and the associated flame thicknesses were computed using a recent kinetic mechanism. Results show substantial reduction of laminar burning velocities with propane substitution, and support the potential of propane as a suppressant of both diffusional-thermal and hydrodynamic cellular instabilities in hydrogen-air flames.

• 한국조리학회지
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• 제24권2호
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• pp.71-78
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• 2018

The increased popularity of group-buying deal promotions has made research efforts grasping the importance of involvement on the positive reactions of consumers. This is due to the fact that consumer purchasing behaviors are highly likely to differ depending on a particular consumer's involvement level, referring to the basic interest in or importance of a group-buying purchase. In this regard, this paper (1) investigated the effects of involvement on purchase behaviors; and (2) examined whether the proposed relationships may vary depending on a consumer's deal prone propensity. Results revealed that a consumer's cognitive involvement in a restaurant promotion affects emotional involvement, ultimately leading to purchase intention. In addition, a consumer's deal proneness tendency was revealed to moderate the relationship between cognitive involvement and emotional involvement. Compared to low deal-prone consumers, high deal-prone consumers tended to have a higher level of emotional involvement resulting from cognitive involvement. Managerial implications and directions for future research are provided.

• 가정과삶의질연구
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• 제12권1호
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• pp.117-131
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• 1994

본 연구는 근린환경에 대한 거주자의 인지도를 파악하고, 현재 거주하고있는 지역의 근린환경에 대한 만족도를 조사하여 앞으로의 주거이동 성향이 어떻게 나타날 것인가를 예측해보는데 그 목적이 있다. 측정도구의 신뢰도계수($Cronbach's\;\alpha$)는 0.865이며, 분석방법은 빈도, 평균, $x^2$ 검증, t-검증, 일원변령분석 요인분석, 피어슨의 상관계수, 중다회귀분석, 다변량판별분석을 사용하였다. 연구결과는 첫째 '입지성' 속성에 대해 거주자의 인지와 만족이 가장 긍정적이었고 '쾌적성 및 정체감' 에 대해 가정 부정적이었다. 둘째 근린환경 인지도가 높을수록 부인의 교육수준이 높을수록 주거소유권이 자가이고 상가주변지역에 살고 있는 거주자들의 근린환경에 대한 총 만족도가 높게 나타났다. 셋째 거주기간 총 만족도, 주거용도 지역, 주택규모, 소득수준이 주거이동 성향을 판별하는 변인으로 나타났다.

• Journal of the Korean Data and Information Science Society
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• 제18권4호
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• pp.1093-1101
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• 2007

Bonus-Malus system in automobile insurance rewards claim-free policyholders by premium discounts and penalizes policyholders with claims by premium surcharges. The purpose of adopting bonus-malus system is to alleviate differences in risk propensity. A well-known side-effect of bonus-malus system is the tendency of policyholders to pay small claims themselves and not report them to their, in order to avoid future premium increases. This phenomenon is called hunger for bonus. In this paper, we introduces an alternative approach to the Bonus-Malus system in automobile insurance - the approach is based on a deductible theory; and then search for a proper way combining both of them. Also, we construct a new algorithm to determine the optimal strategy of the policyholder based on the proposed model.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 춘계학술대회 논문집
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• pp.154-160
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• 1998

This study describes a theoretical and experimental investigation of gas wave propagation in the pipe system. Most calculations of compressible flows in the pipe have been based on the method of characteristics. This technique has propensity to truncate waves and is difficult to apply to non-perfect gas. A method that describes the application of a two-step Lax-Wendroff acheme to solution of the unsteady one-dimentional flow in the pipe was developed. Theoretical calculations using both the method of characteristics and the two-step Lax-Wendroff method are presented including a realistic model for heat transfer and friction processes. In the present work, account is taken of the nonlinear behavior. For sections of parallel pipe, an one dimensional unsteady homentropic analysis is employed, and a numerical solution is obtained with the aid of a digital computer, using the method of characteristics and two-step Lax-Wendroff method. This analysis is then combined with boundary models, based on a quasi-steady flow approach, to give a complete treatment of the flow behavior in the pipe system.

• 디지털융복합연구
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• 제12권2호
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• pp.39-43
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• 2014

전자감시제도는 범죄자를 통제하기 위한 수단으로 최근에 도입되었다. 전자감시제도는 일정한 조건으로 석방된 범죄자가 지정 된 시간에 지정된 장소에 있는지 여부를 확인하기 위한 범죄자의 원격감시제도의 하나로 서 새로운 사회내처우의 하나이다. 전자감시제도는 현재 초기단계이기 때문에 그에 따른 문제점들도 많겠지만, 꾸준한 제도의 보완을 통해 국민들이 범죄로부터 안전할 수 있도록 제도적인 보완작업이 지속적으로 이루어져야 할 것이다.

• 한국치위생학회지
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• 제15권4호
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• pp.575-582
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• 2015

Objectives: The purpose of the study was to investigate the relationship between oral health locus of control and oral health behavior promotion in the adolescents. Methods: A self-reported questionnaire was completed by 493 high school students in Jeonju by convenience sampling from March to June, 2014. The questionnaire consisted of fourteen questions of oral health locus of control, fifteen questions of oral health behavior promotion, and seven questions of the general characteristics of the subjects. Data analysis was done by frequency analysis, t-test, ANOVA, and Duncan's multiple range test. Results: Oral health behavior promotion and oral health behavior index of internal locus of control showed a positive correlation, Higher internal locus of control showed a positive oral health behavior promotion. The higher propensity of oral health on the external locus of control showed the negative effects. Conclusions: The oral health internal locus of control was closely related to better oral health behavior in the adolescents.

• 공학교육연구
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• 제20권3호
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• pp.13-24
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• 2017

This study investigated student engagement of STEM-specialized higher education institutions in comparison with students from humanities & social science and STEM majors, respectively. By doing so, the study aimed to find the effects of the characteristics of STEM disciplines and organizational culture of STEM-specialized small-sized institutions on student engagement. The students majoring STEM disciplines, regardless of the organizational types, showed lower reflective-integrative learning experiences compared to students on humanities & social science disciplines. In contrast, students of STEM-specialized institutions reported significantly higher levels of peer relationship and student-faculty interaction in comparison with humanities & social science students and STEM students of general higher education institutions. Finally, the study suggests policy implications for STEM education.