• 한국통신학회논문지
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• 제23권7호
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• pp.1732-1743
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• 1998

본 논문에서는 트래픽 양이 변화하는 중첩셀 구조에서 다양한 트래픽을 효율적으로 서비스하기 위한 채널 할당기법을 제안한다. 제안한 기법을 통해, 중첩셀 구조의 장점인 용량은 증가하면서 잦은 핸드오프를 방지할 수 있고, 고정채널할당기법이면서도 동적채널할당기법과 유사한 동작을 하여 각 트래픽의 서비스품질(GOS)허용치를 만족할 수 있다. 제안한 기법과 중첩셀 환경에서 각 트래픽에 일정 수의 보호채널을 가진 고정채널할당기법과 비교.분석한 결과, 제안한 방식의 우수함을 볼 수 있었다.

• 대한치과기공학회지
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• 제21권1호
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• pp.131-138
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• 1999

As a society has developed, much concern has been put on appearances of people with development of economy. Accordingly malocclusion patients have been increasing. With this trend, it has become very important to investigate patients characteristics so as to cure the patients effectively. This study investigated 724 malocclusion patients who had been examined diagmosed and recorded well at Chong-a Dental Hospital for 5 years from 1994 to 1998. The results are as follows ; 1) The total number of orthodontic patients in 1998 increased about 79% than in 1994, and female orthodontic patients(68.1%) were more than male ones(31.9%). 2) Age distribution has shown more than 19 year-old group being the largest(48.9%) 3) Distributions in the types of malocclusion according to the Angle's classification have shown 42.5% for class I division, 21.5% for class II division, 35.9% for class III division, being class I division the largest. 4) 50.1% of the total patients were from Kang-nam Gu, So-cho Gu, and Song-pa Gu.

• Computers and Concrete
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• 제11권6호
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• pp.587-602
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• 2013

In the current study, a method for concrete compressive strength prediction (based on cement strength class), incorporated in a software package developed by the authors for the estimation of concrete service life under harmful environments, is presented and validated. Prediction of concrete compressive strength, prior to real experimentation, can be a very useful tool for a first mix screening. Given the fact that lower limitations in strength have been set in standards, to attain a minimum of service life, a strength approach is a necessity. Furthermore, considering the number of theoretical attempts on strength predictions so far, it can be seen that although they lack widespread accepted validity, certain empirical expressions are still widely used. The method elaborated in this study, it offers a simple and accurate, compressive strength estimation, in very good agreement with experimental results. A modified version of the Feret's formula is used, since it contains only one adjustable parameter, predicted by knowing the cement strength class. The approach presented in this study can be applied on any cement type, including active additions (fly ash, silica fume) and age.

• 대한치과교정학회지
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• 제19권3호
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• pp.35-48
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• 1989

1795 patients who visited orthodontic department from 1979 to 1987, were surveyed on the yearly tendency of patient distribution and state of Angle's classification. The results were as follows; 1. There was increased visiting rate of patient per year and higher visiting rate in female than in male. 2. 8-15 age group was 70.3% in total visiting patients and over 20 age group was 10.8%, under 7 age group was 7.3%. 3. Class I malocclusion was 26.3%, Class II div 1 was 31.0%, Class II div 2 was 1.6% and Class III was 41.1% in total visiting patient. 4. There was increased tendency to be received preventive treatment than fixed treatment and increased extracting rate per year in fixed treatment. 5. There was increased tendency for the number of the patient to be received orthognathic surgery.

• 한국통신학회논문지
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• 제16권12호
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• pp.1357-1365
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• 1991

본 논문은 비주기 주파수 도약 확산 시스템(FH/SSMA)에 있어서 주파수 도약 패턴의 요소간, 치환을 이용한 새로운 주파수 도약 패턴 발생 방법을 제안하고, 종래 방법과 비교 검토한다. 제 1방법은 Latin Square에 의한 발생법을 이용하였다. 제2방법은 유한체의 요소를 이용한 치환방법을 설계하였다. 제 3방법에서는 유한체의 기준 집합 요서의 치환 base를 이용하여 발생법을 설계하였다. 평가를 위하여 주기/비주기성의 시간-주파수 변환에 의한 도약 패턴간의 힛트에 대해서 검토하였다. 검토 결과, 종래의 RS계열을 이용한 패펀보다 비주기성의 시간-주파수에 의한 힛트면에서 제2발생 방법이 좋은 결과를 얻었다.

• The Journal of Asian Finance, Economics and Business
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• 제7권8호
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• pp.723-733
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• 2020

The study investigates the effects of online instructional facilitator's qualities on student performance of online class activities. The study explores the roles of instructional facilitators who may influence student performance of online class activities and their academic achievement. The study employs a set of aggregated data from 1,362 subjects and 10 facilitators who participated in multiple online classes. The results of independent samples t-test reveal that the student performance in online classes has no association with facilitators' educational background or academic degree, as well as demographic characteristics, student evaluation records and instructional achievement. The results of multiple regression analysis show that the facilitator engagement has a positive relation to the enhancement of student interaction, reading discussion messages, and the quality of discussion messages in online discussions. The results of correlation analysis show that the facilitator engagement has a positive impact on both increasing the number of reading discussion messages and enhancing the quality of discussion messages. The facilitator engagement increases the quantity of reading discussion postings and enhances the quality of discussion messages, which would be a substantial contribution to student performance by facilitators. The findings suggest that student performance and academic achievement in online classes are not independent of facilitator engagement.

• 보건의료산업학회지
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• 제13권1호
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• pp.31-42
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• 2019

Objectives: The purpose of this study is to analyze the relationship between the change gap in the perception of subjective hierarchy and medical expenditure and the factors influencing medical expenditure. Methods: An analysis based on the the data extracted from the Panel Study of Korea Health Panel for 2012-2013 (n=9,359) is conducted. Further in this study, data analysis included a chi-square test and logistic regression using SPSS version. 22.0 to analyze the factors influencing the turnover intention of industrial workers. Results: Model I showed decreases in medical expenditure by 1.247, 1.391, and 1.441 times in social classes one, two, and Model II showed an increase in medical expenditure by age, spouse, number of family members living together, insurance type, income class, economic activities, subjective health status, chronic illness and change on subjective recognition of social class. Conclusions: The study concludes that the state and community require psychological, social, and cultural support, in addition to individual efforts, to reduce medical expenditure.

• International Journal of Computer Science & Network Security
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• 제21권6호
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• pp.127-136
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• 2021

In the systems and software modeling field, a conceptual model involves modeling with concepts to support development and design. An example of a conceptual model is a description developed using the Unified Modeling Language (UML). UML uses a model multiplicity formulation approach, wherein a number of models are used to represent alternative views. By contrast, a model singularity approach uses only a single integrated model. Each of these styles of modeling has its strengths and weaknesses. This paper introduces a partial solution to the issue of multiplicity vs. singularity in modeling by adopting UML use cases and class models into the conceptual thinging machine (TM) model. To apply use cases, we adopt the observation that a use-case diagram is a description that shows the internal structure of the part of the system represented by the use case in addition to being useful to people outside of the system. Additionally, the UML class diagram is recast in TM representation. Accordingly, we develop a TMUML model that embraces the TM specification of the UML class diagram and the internal structure extracted from the UML use case. TMUML modeling introduces some of the advantages that have made UML a popular modeling language to TM modeling. At the same time, this approach supplies UML with partial model singularity. The paper details experimentation with TMUML using examples from the literature. Our results indicate that mixing UML with other models could be a viable approach.

• 응용통계연구
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• 제33권6호
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• pp.683-696
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• 2020

표본의 다범주 표현형을 예측하는데 사용되는 최적의 유전자집단이란 적은 수의 유전자로 표현형을 정확히 예측할 수 있는 유전자들의 모임이다. 특이발현유전자를 검색하는 통계량은 이미 여러 가지가 있고, K-평균 군집화를 곁들여 중복성이 적은 특이발현유전자들을 선택 가능하다. 이들을 바탕으로 적은 수로 정확하게 다범주 분류가 가능한 유전자집단을 구성할 수 있도록 수정한 입자최적화 방법을 제안한다. 널리 알려진 ALL 248례와 SRBCT 83례를 이용하여 제안된 방법으로 최적유전자집단을 찾을 수 있음을 보였다.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.341-348
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• 2021

펜데믹 시대가 도래하면서 비대면 수업이 실시되고 있으며, 많은 교과에서 비대면 수업의 효과에 대한 연구도 많이 진행되고 있다. 특히, 프로그래밍 수업은 지식 전달과 실습을 겸하는 특성을 가진 과목으로 비대면 수업의 경우에 학생들의 인식면에서 어떤 특성을 보여주는지 알아보기 위하여 비대면 수업과 대면 수업을 각각 실시한 후에 학생들에게 설문 조사하였다. 수업에서의 질문과 응답 용이성, 수업 내용의 이해 및 수업에의 몰입에서는 전통적인 대면 수업이 좋다고 응답한 학생수가 많았으며, 실습 시간 확보 및 수업 제어 면에서는 비대면 수업이 좋다고 응답한 학생수가 많았다. 이와 같은 연구 결과를 활용하면 효과적인 프로그래밍 수업을 계획하는데 도움이 될 수 있을 것으로 기대된다.