• Journal of Korea Society of Digital Industry and Information Management
• /
• v.19 no.4
• /
• pp.137-146
• /
• 2023

The dropout of university freshmen is a very important issue in the financial problems of universities. Moreover, the dropout rate is one of the important indicators among the external evaluation items of universities. Therefore, universities need to predict dropout students in advance and apply various dropout prevention programs targeting them. This paper proposes a method to predict such dropout students in advance. This paper is about a method for predicting dropout students. It proposes a method to select dropouts by applying logistic regression using a shift sigmoid classification function using only quantitative data from the first semester of the first year, which most universities have. It is based on logistic regression and can select the number of prediction subjects and prediction accuracy by using the shift sigmoid function as an classification function. As a result of the experiment, when the proposed algorithm was applied, the number of predicted dropout subjects varied from 100% to 20% compared to the actual number of dropout subjects, and it was found to have a prediction accuracy of 75% to 98%.

• Journal of the Korea Concrete Institute
• /
• v.21 no.2
• /
• pp.169-178
• /
• 2009

An equation for calculating confining reinforcement amount of RC bridge columns, specified in the current bridge design codes, has been made to provide additional load-carrying strength for concentrically loaded columns. The additional load-carrying strength will be equal to or slightly greater than the resistant strength of a column against axial load, which is lost because the cover concrete spalls off. The equation considers concrete compressive strength, yield strength of transverse reinforcement, and the section area ratio as major variables. Among those variables, the section area ratio between the gross section and the core section, varying by cover thickness, is a variable which considers the strength in the compression-controlled region. Therefore, the cross section ratio does not have a large effect in the aspect of ductile behavior of the tension-controlled region, which is governed by bending moment rather than axial force. However, the equation of the design codes for calculating confining reinforcement amount does not directly consider ductile behavior, which is an important factor for the seismic behavior of bridge columns. Consequently, if the size of section is relatively small or if the section area ratio becomes excessively large due to the cover thickness increased for durability, too large an amount of confining reinforcement will be required possibly deteriorating the constructability and economy. Against this backdrop, in this study, comparison and analysis were performed to understand how the cover thickness influences the equation for calculating the amount of confining reinforcement. An equation for calculating the amount of confining reinforcement was also modified for reasonable seismic design and the safety. In addition, appropriateness of the modified equation was examined based on the results of various test results performed at home and abroad.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.19 no.1
• /
• pp.146-157
• /
• 2018

Over the last 10 years, the number of disasters has been increasing in Korea. As a result, the need for temporary residences or shelters for disaster conditions is increasing. In this study, post-disaster refugees housing was developed using lightweight composite panels that are lighter than the materials that make up the existing shelter. To accomplish this, the structural performance of the lightweight composite panel was validated. Among the performance tests on the panels, the transverse load test was conducted according to the ASTM E 72 criteria. As a result of the experiment, when each specimen was subjected to a uniformly distributed load, the allowable load was determined according to the span. All the experiments were ended due to a loss of adhesive at the junction of the skin and core. Further analysis was conducted to calculate the shear stress when the junction was dropped. The mean shear stress at the adhesive surface of a specimen, 150 mm and 200 mm in thickness, was 0.0170MPa and 0.0156MPa, respectively. This suggests that similar values were obtained from panels of equal thickness. In addition, this stress provides a criterion of judgment that could be used to inspect the structural performance of the panels. The performance of the panel was evaluated based on the allowable load, but it may be possible to increase the strength of the lightweight composite panel by improving the joining method to avoid separation from the junction.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.36 no.4
• /
• pp.556-562
• /
• 2009

Ectopic eruption of the maxillary first permanent molar means that the molar erupts out of the normal position and is arrested in its eruption by the second primary molar. This local eruption disturbance results in a premature atypical resorption on the distal part of the second primary molar. In most irreversible cases, the second primary molar is lost prematurely, either by spontaneous exfoliation or by extraction, In cases of doubt as to whether the eruption is of the irreversible type or not, careful radiographic observation period for a few months would be valuable in evaluating the possibilities of the tooth's freeing itself. The purpose of this study was to determine the characteristics and occurrence of the ectopic eruption of the maxillary first permanent molar. A descriptive, observational, retrospective study was done using the radiographs of 25 conseutive patients, who were in the first phase of mixed dentition. A method was designed to evaluate the amount of pathologic resorption of the second maxillary primary molar and the mesial angulation of the first permanent molar. The study showed that the most important etiologic factor was the eruption path or mesial angulation of the first permanent molars relative the chosen reference lines.

• MALSORI
• /
• no.31_32
• /
• pp.173-193
• /
• 1996

불어의 "묵음 e(e muet)"에 대한 정의를 내리기는 매우 까다롭다. 불어에서 "e"가 "묵음 e(e muet)"로 불리우는 이유는 "e"가 흔히 탈락되기 때문이다. 현재 "e muet"는 다음 발화체에서 볼 수 있듯이 열린음절에서만 나타난다. "Je/le/re/de/man/de/ce/re/por/ta/ge/." [omitted](나는 그 리포트를 다시 요구한다. : 이 경우 실제 발화시 schwa 삭제 규칙이 적용된다.) 둘째, 접두사에 나타나는 "e muet"는 s의 중자음 앞에서 s가 유성음, [z]로 발음되는 것을 막기 위해 쓰인다. "ressembler[omitted](닮다); ressentir[omitted](느끼다)" 같은 경우, 셋째, 몇몇 낱말의 경우 고어의 철자가 약화되어 "e muet"로 발음이 되고 있다. "monsieur[$m{\partial}sj{\emptyset}$](미스터), faisan[$f{\partial}z{\tilde{a}}$](꿩), faisait[$f{\partial}z{\varepsilon}$]("하다"동사의 3인칭 단수 반과거형)"등. 또 과거 문법학자들은 이를 "여성형의 E"로 불렀는데, 이는 형태론적으로 낱말의 여성형을 남성형과 구분짓기 위해 사용되고 있기 때문이기도 하다. 예를 들어, "$aim{\acute{e}}-aim{\acute{e}}e$"(발음은 둘 다 [${\varepsilon}me$]로 동일하다 : 사랑받다)의 경우. 현대불어의 구어체어서 "e muet"는 어말자음을 발음하기 위해 쓰이고 있다. 예를 들어, "pote[pot](단짝)-pot[po](항아리)". 이러한 "e muet"는 발음상으로 지역적, 개인적 및 문맥적 상황에 따라 그 음색 자체가 매우 불안정하며 여러 가지 음가(열린 ${\ae}$ 또는 닫힌 ${\O}$)로 나타난다. 예를 들어 "seul[$s{\ae}l$](홀로), ceux[$s{\O}$](이것들)"에서와 같이 발음되며, 또한 원칙적으로 schwa, [${\partial}$]로 발음이 되는 "Je[$\Im\partial$]"와 "le[$l{\partial}$]"의 경우, Paris 지역에서는 "Je sais[${\Im}{\ae}{\;}s{\Im}$](나는 안다); Prends-le[$pr{\tilde{a}}{\;}l{\ae}$](그것을 집어라)"로 발음을 하는 한편, 프랑스 북부 지방세서는 동일한 발화체를 [${\ae}$]대신에 [${\o}$]로 발음한다. 실제로 언어학적 측면에서 고려되는 "e muet"는 schwa로 나타나는 "Je[$\Im\partial$]"와 "le[$l{\partial}$]"의 경우인데, 불어 음운론에서는 schwa에 의해 대립되는 낱말짝이 없기 때문에 schwa를 음소로 인정할 것인가에 대해 논란이 있다. 그러나 불어에서 schwark 음운론적 역할을 한다는 사실은 다음과 같은 예에서 찾아 볼 수 있다. 첫째, 발음상으로 동사의 변화형에서 "porte[$p{\jmath}rte$](들다: 현재형), porte[$p{\jmath}rte$](과거분사형), porta[$p{\jmath}rte$](단순과거형)"등이 대립되며, 이휘 "Porto[$p{\jmath}rte$](포르토)"와도 대립된다. 둘째, 어휘적 대립 "le haut[$l{\partial}o$](위)/l'eau[lo](물)"와 형태론적 대립 "le[$l{\partial}$](정관사, 남성단수)/les[le](정관사, 복수)"등에서 "묵음 e"는 분명히 음운론적 역할을 하고 있다. 본 논문에서는 이와 같이 음색이 복잡하게 나타나는 "e muet"의 문제를 리듬단위, 문맥적 분포 및 음절모형 측면, 즉 음성학 및 음운론적 측면에서 다양하게 분석하여 그 본질을 규명해 보고 "e muet"탈락현상을 TCG(Theorie de Charme et de Gouvernement) 측면에서 새롭게 해석해 보았다.

• Radiation Oncology Journal
• /
• v.4 no.2
• /
• pp.99-105
• /
• 1986

Optimal balance between control probability and risk of complication is emphasized even in present time, Although certain incidence of intestinal injury is accepted as an inevitable consequence after abdominopelvic irradiation, these complications still remain as problems. 60 mice were irradiated with 250 kVp orthovoltage x-ray machine and $200rad{\times}5/wk$ regimen. Histpathologic findings of colorectum and the relationship with occult blood test were analyzed and possible tolerable dose which would be safe from permanent complication was also estimated. Followings are the results: Mild mucosal and submucosal edema were observed in 1,000 rad irradiated group. Congestion of small vessels was prominent in 2,000 rad irradiated group and infiltration of inflammatory cells was observed in 3,000 rad irradiated group. Denuded mucosa was observed in 3,000 rad irradiated group. Occult blood test is not a proper indicator for rectal denuding or rectal ulcer, but our results suggest the possibility of using this as a relative scale of intestinal damage. Mitotic figures of crypt cells were observed even in 5,000 rad irradiated group, these suggest that the repair capacity of crypt cells are still functioning.

• Therapeutic Science for Rehabilitation
• /
• v.9 no.2
• /
• pp.27-38
• /
• 2020

Introduction : This review aims to introduce an intention-to-treat analysis(ITT) method and demonstrate the importance of rigorous utilization of this method to researchers in Korea. Discussion : ITT analysis includes all data as results in randomized control trials (RCT). Thereby the result of RCT is high validated to adapt in the real-world so that the result should be expected at clinical practice. Therefore, many RCT quality assessment tools include the question of the utilization of ITT analysis in individual trials. However, many researchers omit to report ITT, not utilize ITT or use ITT incorrectly. Conclusion : Through this review, more Korean researchers may understand and utilize ITT which is expected to enhance the quality of RCT papers.

• The Journal of Information Technology
• /
• v.1 no.2
• /
• pp.143-162
• /
• 1998

As a method of providing lifelong educational opportunities to working professionals, some legal provisions allowing for the establishment and management of an entrusted education system linked with college and corporation was duly approved in 1994. According to the recent trend in the military organization, to provide higher educational opportunities to noncommissioned officers and warrant officers with the purpose of inspiring their spirit and improving military capabilities has been much increased. Professional soldiers such as noncommissioned officers and warrant officers have a lot of problems to continue their attendance at school because of regular military maneuvers, constant alert status and long-term outdoor military training. Even more serious problem is that the current curriculums and some departments in college are not concurrent with the present job specifications and the military specialties of the individual soldier as well. The purpose of this paper is, therefore, to introduce a newly revised educational model that provides more viable academic courses and curriculums to military professionals along with a proposal for the establishment and management of long distance educational system within barracks, utilizing the latest information and telecommunication technology.

• The Journal of the Korea Contents Association
• /
• v.16 no.11
• /
• pp.754-766
• /
• 2016

What is the relationship between the power of mask and the popularity of 'Umakdaejang(which means a band master in Korean)' who was one of the mask-singers in King of Masksinger? And which aspects of the contemporary Korean society were projected to this fever of Umakdaejang? This study has made efforts to answer these questions. To do this, it has examined the episodes that Umakdaejang appeared in the TV program King of Masksinger, has dealt with the origin and purpose of mask, and with the cultural meaning of the mask's concealing and revealing identity in order to understand the power of mask. Findings are as follows. Umakdaejang amplified the curiosity of his identity by displaying anonymous typicality with the mask. He also showed the resistant gestures against the forms and manners of the existing TV music programs through the way of somewhat tough, uncontrolled, and mischievous behaviors. By doing so, he exposed the desire of self-revelation. As a result, by means of its anonymity and resistance, the mask functioned as an effective apparatus being able to resist against the class polarization of the capitalist ideology. This can be viewed as the origin of the fever of Umakdaejang as well as the very power of mask itself.

• The Journal of the Korea Contents Association
• /
• v.17 no.12
• /
• pp.77-91
• /
• 2017

Due to the lack of learning motivation, there is a need to seek ways to facilitate learning incentives because it's causing drop out and maladjustment of university life. This study is to examine whether the ARCS evaluation model developed by Keller (1983) is a valid model for evaluating the motivation level of local university students sample 276(male 116, female 157) in the Republic of Korea. To analyze the data, average statistic, one-way ANOVA and confirmative factor analysis were used. The conclusion of this study is as follows. First, the level of motivation per ARCS factor has demonstrated the highest relevance factor. Second, the level of motivation by the ARCS for the 1st and 3rd graders was appropriate. Differences in 'attention' and 'relevance' have only been observed for each year, and the 1st grade group was found to be larger than the 2nd grade cohort. Third, construct validity and convergent validity were obtained for measuring the level of motivation. The results of the verification of the variables also showed that the AVE and CR were met, and the model fit well was satisfactory. Based on the finding results, discussion and implication for further research were suggested.