• Transactions of the Korean Society of Automotive Engineers
• /
• v.3 no.1
• /
• pp.108-117
• /
• 1995

The primary purpose of this extensive test effort was to observe real-time operational performance characteristics associated with automotive grade fuel utilized by piston engine powered light aviation aircraft. In fulfillment of this effort, baseline engine operations were established with 100LL aviation grade fuel followed by four blends of automotive grade fuel. A comprehensive sea-level-static test cell/flight test data collection and evaluation effort were conducted to review operational characteristics of a carbureted light aircraft piston engine as related to fuel volatility, fuel temperature, and fuel system pressure. Presented herein are results, data, and conclusions drawn from test cell engine operation as well as flight test operation on 100LL aviation grade and four blends of automotive grade fuel.

• English Language & Literature Teaching
• /
• v.18 no.2
• /
• pp.125-147
• /
• 2012

The primary goal of the study was to provide some preliminary validity evidence for the Vocabulary Grade Levels Test (Busan Metropolitan City Office of Education, 2009), which is designed to measure the receptive vocabulary knowledge of learners in L2. For the purpose of the current study, 327 participants at the elementary school participated in the study and were asked to take two different vocabulary tests. Namely, a Vocabulary Size Test (Nation, 2001) and a Vocabulary Grade Levels Test. The data were analyzed using correlation in order to discover the relationship between these two types of tests. Following this, the Rasch analysis was conducted to examine the reliability and validity of the measurement in question. The data analysis showed that both grade separation reliability and item separation reliability were high, indicating that the Vocabulary Grade Levels Test well discriminates learners with a wide range of proficiency levels. The findings of the study are discussed, along with further improvements in order to ascertain the validity of this particular vocabulary test.

• Journal of Korean Foot and Ankle Society
• /
• v.8 no.1
• /
• pp.7-10
• /
• 2004

Purpose: To estimate the prevalence of flat foot in the 1st grade primary school children in the Kang-Dong Gu, Seoul, Korea. Materials and Methods: We examined 1336 8 year old the first grade children (2672 feet) in primary school at 5 primary school for prevalence of flat foot and the associating factors in Kang-Dong Gu in April 2003. The group was examined with 2 mm-pannel in physical examination at erect position to put diagnosis of flat foot which showed no plantar arch. The height, weight, foot length and foot width were estimated in all children. We used obesity grading system of Korean Pediatric Association for overweight evaluation. Results: We enrolled 728 boys and 608 girls, and prevalences of each gender were 20.8% and 14.9%. The children who had flat foot were 243 and the prevalence of flat foot was 18.2%. The foot length ranges between 152 mm and 300 mm (mean value 183.6 mm, SD 10.6), and the foot width were between 50 mm and 107 mm (mean value 2.16 mm, SD 4.8). Of the 1336 children group, 1215 children (90.0%) were in range of normal weight, 72 children (5.4%) were in grade-1 overweight, 38 (2.8%) were in grade-2 overweigh and, 11 (0.8%) were in grade-3 overweight. The prevalence of flat foot of each overweight group were 16.3%, 34.7%, 39.5% and 45.5%. Overweight in children effected increased prevalence of flat foot. But there were no significant relationship with flat foot in other factors. Conclusion: Over all prevalence of flat foot of 8 year old children was 18.2% and most of patients were flexible flat foot. The prevalence of flat foot was influenced by overweight remarkably.

• Journal of Korean Ophthalmic Optics Society
• /
• v.8 no.2
• /
• pp.105-109
• /
• 2003

This study surveyed the family relations of glasses wearer who were 80 primary student among 1321 students. They live in Iksan city, Jeon buk Province. The questionnaire of this study were the first wearing time, relations with parents, relations with brother and sister, and changing visual acuity. The question about when they were the first wearing glasses was answered 26% of all answerer at first grade, each 20% at second grade and third grade, 16.2% at preschool, 15% at fourth grade, and each 1.2% fifth and sixth grade. The Question was the relations between students' wearer and their parents about wearing glasses, 37.5% of wearer answered their parents didn't wearing glasses, 32.5% for mother was glasses wearer, 20% for mother and father were wearer, and 10% for father was wearer. In case of the relations between students' wearer and sister or brother about wearing glasses, 33.7% of wearer answered their brother or sister wearing glasses but the others only wearing glasses oneself. Visual acuity of the students' wearer was checked during wearing glasses. 58.7% of wearer answered their visual acuity didn't change, 35% for worse and 6.2% better visual acuity.

• Korean Journal of Child Studies
• /
• v.32 no.6
• /
• pp.123-139
• /
• 2011

This study sought to examine the impact of reading ability and vocabulary at age 5, as well as analyzing the impact which children's gender, parental education level and family income level has on reading comprehension ability and vocabulary at the first grade level in primary school. The study also sought to compare the characteristics of the results obtained in Korea and Japan on this particular research topic. For the Korean part of the study, 328 first grade Korean children, who had participated in the initial testing as five-year olds and agreed to participate in the longitudinal study were tested; whereas in Japan, 215 students were tested. The study results indicated that, in the case of Korea, reading comprehension ability in the first grade was affected by vocabulary and reading abilities at age 5, gender, as well as the mother's education level, in that order. In Japan, it was affected in the order of vocabulary, gender, and father's education level. In terms of first grade vocabulary, in the case of Korea, it was affected in the order of vocabulary and reading ability at age 5 and father's education level; whereas in Japan, it was affected in the order of vocabulary, gender, and reading ability. In both Korea and Japan, at age 5, vocabulary was shown to have a more significant impact than reading ability on both of language ability and vocabulary in the subsequent primary school period. As such, it can be seen that more interest should be shown not only in the ability to read at age 5 but also in expanding the vocabulary of children at this age through appropriate interaction and support.

• Tuberculosis and Respiratory Diseases
• /
• v.76 no.3
• /
• pp.131-135
• /
• 2014

Low-grade endometrial stromal sarcoma (ESS) is an uncommon gynecologic malignancy of mesodermal origin. Pulmonary metastasis of low-grade ESS can occur years and decades after the treatment of the primary disease. Low-grade ESS is frequently mistaken as benign uterine neoplasm like uterine leiomyoma, which can potentially lead to a misdiagnosis. We present a case of a 42-year-old woman with low-grade ESS, that initially presented as an incidental lung mass with multiple pulmonary nodules, seven years after an uterine myomectomy. A $6.9{\times}5.8cm-sized$ intrapelvic mass suspected of uterine origin was discovered while searching for potential extrathoracic primary origin. A pelviscopy and simultaneous thoracoscopic lung biopsy were conducted for pathologic diagnosis. Finally, the diagnosis was confirmed as low-grade ESS with lung metastasis based on the histopathologic examination with immunohistochemical stain, which was showed positive for CD10 and hormone receptor markers (estrogen and progesterone receptors) in both pelvic and lung specimens.

• The Mathematical Education
• /
• v.41 no.3
• /
• pp.291-318
• /
• 2002

We investigated on the primary school children's abilities of formal reasoning. Seventy students in grade 5 participated in the study. They responsed their best reactions on the problems constituted of three parts requiring the informal or formal reasoning and generalization. Their reactions are classified by some criteria depending the level of reasoning. About 10 students showed that they constructed a kind of scheme for solving the problems, similar to formal reasoning and beyond naive informal reasoning. And about 30 students did so partially. We concluded that the teaching and learning of reasoning by the progressive increasing the degree of rigor from grade 5 is possible.

• Journal of the Society of Naval Architects of Korea
• /
• v.34 no.4
• /
• pp.108-118
• /
• 1997

For the LNG carrier, the calculation of temperature distribution of cargo tank is necessary to select the steel grade and to estimate the boil-off rate(BOR). Since the previous studies with 2-D and 3-D method ignored the effect of several primary members, the effect was included by applying the better equations for the convection coefficient that is the most important item in this kind of study. After evaluating the program considering the primary members, the results are reflected to the design of the concerned LNG carrier.

• Nuclear Engineering and Technology
• /
• v.30 no.6
• /
• pp.609-616
• /
• 1998

Cast duplex stainless steels are extensively used for primary pressure boundary components. These components are, however, embrittled due to the precipitation of $\alpha$' phase by spinodal decomposition and other processes when exposed to reactor operating temperature for a design lifetime or life extension conditions. This report presents a procedure for estimating the current condition and the residual life of safety-related stainless steel components by using ANL database and correlations. The database of Charpy impact energy suggests that CF-8M grade is the most susceptible to thermal aging and CF-3 grade is the least. Thus, the integrity of CF-8M alleys may be degraded seriously and the degree of deterioration may exceed acceptance limit after several years of service in the nuclear reactors.

• Tuberculosis and Respiratory Diseases
• /
• v.38 no.1
• /
• pp.34-44
• /
• 1991

Restoration of skin reactivity to 1 TU of tuberculin (RT23) by repeated tests at 10 days interval has been investigated in the BCG vaccinated or unvaccinated primary school children. The results obtained are as follows. 1) Tuberculin reactors showing 6 mm or larger induration to the first tests were 20.0% in the first grade school children and 33.3% in the sixth grade children. Six millimeter or larger reaction than that of the first reaction was found in 14.9% of the first grade children and in 34.6% of the sixth grade children. 2) Six millimeter or larger reactors were 10.8% of the first grade children without BCG scar against both first and second tests and 11.8% of the sixth grade children on first tests and 10.6% on second tests. There was none or very few, if any, in number of 6 mm or larger difference between the first and second tests among children without BCG scar. In addition, there was no children shown 6 mm or larger second reaction than that of the first reaction and thus those reactors seemed to be natural infection. 3) From questionaire survey, parents of 73.3% of the first grade children and of 72.7% of the sixth grade children were aware of BCG vaccination of their children, while parents of 15.1% and 24.6% of the first and sixth grade children did not know their children's vaccination history even if children possessed BCG scar. 4) Of the first grade children whose parents remembered their BCG vaccination, 65.6% were vaccinated within 4 weeks after birth and 25.5% between 4 weeks and one year. Six millimeter or larger reaction on the first tests was observed in 20.2% of the former group and 15.9% of the latter group, however reactors on the second tests were 32.1% and 31.9% respectively. BCG scar was not observed in 13.9% of children. 5) The majority of children (87.3%) were vaccinated in the skin of deltoid area and some (7.7%) at buttock or other areas. Children received first vaccination at the health centers were 68.5% and 30.3% at hospitals. More than 5 mm reaction was found in 18.7% of the former children and in 15.0% of the latter children. From this study restoration of tuberculin reactivity by repeated tests was found very common among the vaccinated children and thus it should be taken into account for the vaccination policy if it is performed after tuberculin testing.