The purpose of this research was to evaluate the correlation between obesity, threshold of salty taste, optimal saltiness and blood pressure in middle school students in a fishing village. The subjects were 115 boys and 103 girls in middle school in a fishing village. The BMI index and systolic and diastolic blood pressures of subjects were measured, and the subjects were divided into a normal and obese group according to their BMI. The threshold of salty taste and salt preference for a semisolid dish (steamed egg dish), liquid dish (bean sprout soup), and a solid dish (raw radish salad), were estimated by sensory evaluation. Calorie intake was measured using the weighing plate method. The boys in the obese group showed significantly higher systolic and diastolic blood pressures than those in the normal, but girls did not. Furthermore, calorie intakes of the boys in the obese group were significantly higher than those in the normal group, but this was not shown in girls. On the threshold of salty taste, both boys and girls in the obese group needed higher concentration of salt than those in the normal group. The threshold of salty taste were significantly positively correlated with systolic pressure and diastolic pressure in boys. Regarding the salt preference in the steamed egg dish, bean-sprout soup, and raw radish salad, both boys and girls in the obese group preferred higher concentrations. The higher concentration they preferred, the higher the systolic and diastolic pressures were in boys, but only systolic blood pressure was higher in girls. From these results, it is evident that a nutritional education program is needed in school to help restricting middle school students salt consumption and decreasing obesity to prevent hypertension.

본 연구는 운전자 연령대와 뇌손상 여부에 따라 다양한 반응시간 과제에서의 반응시간과 반응정확성에서 어떠한 차별성이 있는지 살펴볼 목적으로 수행되었다. 이를 위해 30-50대의 중년운전자, 65세 고령운전자, 그리고 65세 이상의 뇌졸중 고령운전자들을 대상으로 단순반응, 2-선택반응, 자극 이심률을 달리한 4-선택반응, 탐색반응 및 동적자극 탐지 과제에 대한 수행을 비교하였다. 본 연구의 결과를 정리하면 다음과 같다. 첫째, 전반적으로 중년, 고령 및 뇌졸중 고령운전자 순으로 느린 반응시간을 보였으나 자극 이심률이 작은 조건(5o)에 비해 큰 조건(10o)에서 뇌졸중 고령운전자의 반응시간이 다른 집단에 비해 더 두드러지게 지연되었다. 둘째, 전체 반응시간에서 단순 반응시간을 감산한 반응시간 을 분석한 결과, 2-선택반응 과제와 동적자극 탐지과제에서의 집단간 반응시간 차이는 유의하지 않았는데, 이것은 이러한 과제들에서의 반응시간 차이가 단순 반응시간에 의해 주로 결정된다는 것을 시사한다. 셋째, 일시적 기억을 요구하는 탐색과제에서는 두 고령운전자 집단이 중년운전자 집단에 비해 유의하게 느리고 부정확한 수행을 보였다. 넷째, 집단간 반응정확성에서의 차이는 선택 대안이 많은 과제와 기억을 요구하는 과제에서 두드러졌다. 이러한 결과는 기억 요구를 수반하는 탐색과제는 중년과 고령운전자 사이의 수행을, 반면 자극이심률 조건은 뇌졸중 여부에 따른 고령운전자 집단에서의 수행 차이를 민감하게 반영할 수 있음을 시사한다.

This experiment was carried out to study the effect of rice black-streaked dwarf virus(RBSDV) infection rate on forage productivity of corn varieties in Cheonan of chungcheongnamdo from 2006 to 2008. Forage corn varieties of 10 were cultivated with first cropping(seeding in the last ten days of April) and second cropping(seeding in the last ten days of May) system in field and tested the infection rates of RBSDV and productivity of forage. The Infection rate of RBSDV was significant difference between corn varieties in middle district of Korea. Resistant corn varieties for RBSDV were ‘Kwanganok’, ‘P3156’, ‘Kwangpeyongok’ and ‘P3394’ but susceptible varieties were ‘Suwon19’, ‘DK697’, ‘GW6959’ and NC+7117. Dry matter(DM) yield of forage corn according with infection rates of RBSDV in field was significant difference between varieties(p<0.05). DM yield of susceptible varieties, ‘Suwon 19’, ‘DK697’ and ‘GW6959’ was lower about 20% than that of resistant varieties, ‘Kwangpeyongok’ and ‘P3156’. For increasing the productivity of forage corn, recommend of resistant varieties for RBSDV and control of seeding time are very important in middle district of Korea.

In this study, we investigated the correlation between the number of cyanobacterial species and the water quality factors after installation of Nakdong river weirs. Factor analyses of water quality factors were also performed. The results of correlations showed that there was no significant water quality with the cyanobacterial concentration but the correlation coefficient of nutrients increased from the upstream to the downstream. There was a significant correlation between W·T and pH as important water quality factors for the growth of cyanobacteria. In the downstream region of Nakdong river, algae were more frequently detected than in the upstream region, and the blooms of algae species seem to be influenced by the higher pH and the influx of the phosphorus from the upstream tributaries. Nutrient concentration was higher in the downstream region than in the upstream region due to the effects of tributaries Geumho river and Nam river in Nakdong river. As a result of the factor analyses, nitrogen species were the principal factors in the upper region, and phorsphorus species were the principal factors in the downstream region.

PURPOSES : The purpose of this study is to investigate the fundamental behaviors such as stresses and deflections of the middle slab in a double-deck tunnel for the development of a middle slab design guide. METHODS : The middle slab has been divided into the following three different sections as according to its structural differences: the normal section, expansion joint section, and emergency passageway section. The normal section of middle slab represents the slab supported by brackets installed continuously along the longitudinal direction of tunnel lining. The expansion joint section refers to a discontinuity of middle slab due to the existence of a transverse expansion joint. The emergency passageway section has an empty rectangular space in the middle slab that acts as an exit in an emergency. The finite element analysis models of these three sections of middle slab have been developed to analyze their respective behaviors. RESULTS: The stresses and deflections of middle slab at the three different sections decrease as the slab thickness increases. The emergency passageway section yields the largest stresses and deflections, with the normal section yielding the smallest. CONCLUSIONS: The stress concentrations at the corners of the passageway rectangular space can be reduced by creating hunch areas at the corners. The stresses and deflections in the emergency passageway section can be significantly decreased by attaching beams under the middle slab in the passageway area.

This study aimed to compare energy nutrient intake, health related factors, physical characteristics, blood biochemical indices, prevalence of metabolic syndrome and odds ratio (OR) of metabolic syndrome based on dietary fat energy ratio. Subjects were 1,205 men aged 40~64 years. The average fat intake was 52.8 g. Subjects were divided into three groups (deficient, normal, excess) based on dietary fat energy ratio. The dietary fat energy rations of the three groups were 36.9%, 42.9% and 20.2%, respectively. Energy and protein intake were increased significantly with dietary fat energy ratio (p<0.001), whereas carbohydrate intake decreased (p<0.001). In health related factors, amount of smoking alone showed increase based on dietary fat energy ratio (p<0.001). In comparing physical characteristics, blood pressure and blood biochemical indices, excepting diastolic blood pressure, increased significantly based on dietary fat energy ratio (p<0.01~p<0.001). The rate that exceeded criteria in risk factors for metabolic syndrome was higher in the serum triglyceride (41.2%) and was lower in the waist circumference (22.2%). Prevalence of metabolic syndrome was 37.9%, and showed significant correlation to dietary fat energy ratio (p<0.05). The OR of metabolic syndrome was higher in deficient and excess group than in normal group, but it had no relationship between fat energy ratio and metabolic syndrome. The results of this study provide basic data to establish fat intake guidelines for prevention of metabolic syndrome in middle-aged men.

This present study investigated characteristics of distribution and community structure of macrobenthic invertebrates through the survey of commercial Danish seine fisheries from 2011 to 2013. In this study, a total of 28 species were sampled with a mean density of 32,568 ind./km2 and mean biomass of 1,649.5 kg/km2. The dominant species, comprising over 1.0% of the total number of individuals, were Chionoecetes opilio (11,203 ind./km2, 34.4%), Pandalus eous (9,247 ind./km2, 28.4%), Ophiuridae spp. (5,750 ind./km2, 17.7%), Argis lar (2,631 ind./km2, 8.1%), Neocrangon communis (994 ind./km2, 3.1%), Berryteuthis magister (612 ind./km2, 1.9%), Sepiola birostrata (499 ind./km2, 1.5%) and Strongylocentrotidae sp. (424 ind./km2, 1.3%). The dominant species, in terms of biomass, comprising over 1.0% of the total biomass, were C. opilio (1,167.2 kg/km2, 70.8%), B. magister (130.3 kg/km2, 7.9%), P. eous (102.4 kg/km2, 6.2%), Ophiuridae spp. (84.6 kg/km2, 5.1%), Enteroctopus dofleini (45.5 kg/km2, 2.8%), A. lar (35.7 kg/km2, 2.2%), Strongylocentrotidae sp. (25.0 kg/km2, 1.5%) and S. birostrata (22.1 kg/km2, 1.3%). Among them, S. birostrata, E. dofleini, Strongylocentrotidae sp. and Ophiuridae spp. were higher abundance and biomass in the shallow water (<200 meters in depth), whereas C. opilio, P. eous, A. lar, N. communis and B. magister were higher in the deep water (301 ~ 500 meters in depth).As the results of cluster analysis and non-metric multidimensional scaling (nMDS) analysis based on the Bray-Curtis similarity of fourth root transformed data for number of species and individuals, the macrobenthic invertebrates community by Danish seine survey was divided into two groups of station in the shallow water (<200 meters in depth, Group A) and the deep water (201 ~ 500 meters in depth, Group B). The major individual-dominant species was S. birostrata, Ophiuridae spp. and immature C. opilio in group A. But Group B was P. eous, A. lar, B. magister and mature C. opilio.

본 연구는 뿌리부추를 시설하우스에서 재배할 경우 여름철 고온기 하고현상(Summer depression)을 방지하기 위하여 차광막을 하우스 내부 또는 외부에 설치하여 차광정도를 달리하면서 생육 및 수량에 미치는 영향을 조사하기 위하여 수행되었다. 2015년 하우스 내부에 무차광, 35, 55, 75, 95% 차광막을 설치하여 정식 후 20일 째 되는 날에 최종 출현 정도를 조사한 결과, 무처리, 35 및 75% 차광에서 98% 출현하였고, 55 및 95% 차광에서 100% 출현하였다. 차광 정도와는 상관없이 모든 처리에서 최종 출현은 양호하였다. 하우스 내외부에 차광막을 설치했을 경우, 2년간 평균 생중량(Fresh weight) 은 75% 차광에서 6,323kg/10a으로, 무차광, 35%, 55%, 95% 차광보다 각각 5.0배, 1.8배, 1.1배, 1.7배 높았다. 하우스 외부에 차광막을 설치할 경우 생중량은 75% 차 광에서 684g으로, 55%, 95% 차광보다 1.1배, 1.8배 높았다. 건중량(Dry weight), 건물율(Percentage of dry matter), 엽수(No. of leaves), 분얼수(No. of branches), 초장(Plant height), 근장(Root length) 등 분석결과 75% 차광이 다른 차광 보다 통계적으로 유의하게 높거나 절대적 수치가 높게 측정되어 중부지역에서 뿌리부추를 재배 할 경우에는 75% 차광이 가장 적합한 것으로 판단 되었다.

In unlimited competition era changed rapidly, productivity improvement and raw cost reduction by working improvement are very important for the survival of middle and small-sized companies. At this moment, middle and small-sized companies are cleary important in domestic industry. Therefore, this researcher applied TPS(Toyota production system) 7 wastes by experiment planning method for wastes of lots of working processes at the manufacturing site of automobile assembly manufacturing company, D company, analyzed current system of D company applied so as to verify if value creation works and factors were minimized during the production and drew results by analyzing experimental planning for analyzing waste elimination.

본 연구는 장년층(50～64세) 1인가구의 인구사회학적 특성과 삶의 만족도 수준을 파악하는 데 목적을 두고 다인가구와 비교분석하였다. 이를 위하여 국민노후보장패널 4차 자료를 이용하였다. 분석결과, 인구사회학적 특성에 있어서 장년층 1인가구는 성별, 연령, 혼인상태, 자녀유무, 신체적 건강상태 심리적 건강상태, 우울감, 외로움, 교육수준, 가구 소득, 공적연금보유여부에서 다인가구와 통계적으로 유의한 차이가 나타났다. 또한 장년층 1인가구의 삶의 만족도를 생활전반 만족도와 10개 하위영역별 만족도(주거, 경제적 상태, 일, 건강, 여가활동, 가족관계, 자녀관계, 형제․자매관계, 친구관계, 이웃관계)로 살펴본 결과 모든 영역에서 1인가구는 다인가구보다 만족도 수준이 유의하게 낮은 것으로 확인되었다. 이러한 연구결과를 바탕으로 정책적 함의를 제시하였다.

연구의 목적은 여자 중학생의 대인관계문제가 섭식문제에 영향을 미치는 과정의 이면기 제를 밝히고자 대인관계문제와 섭식문제의 관계에서 긍정반응경향의 매개효과를 검증하는데 있다. 대전 및 충청권에 거주하는 여자 중학생 712명으로부터 자기보고식 질문지 자료를 수집 하고 구조방정식모형(structural equation modeling) 분석을 실행하였다. 긍정반응경향이 대인 관계문제와 섭식문제의 관계를 매개하는 관계모형의 적합도를 검증하고, Sobel 검증을 사용하 여 긍정반응경향의 매개효과를 검증하였다. 첫째, 연구모형(부분매개모형)에 비해 경합모형 (완전매개모형)의 적합도가 더 양호하였다. 둘째, 대인관계문제와 섭식문제의 관계에서 긍정 반응경향의 매개효과가 유의하였다. 긍정반응경향이 매개변인으로 설정되면, 대인관계문제가 섭식문제에 직접 영향을 주기보다는 긍정반응경향을 통해서 간접적으로 영향을 주는 것으로 나타났다. 셋째, 대인관계문제의 수준이 높을수록 긍정반응경향의 수준이 낮고, 긍정반응경향 의 수준이 낮을수록 섭식문제의 수준이 높았다. 이러한 결과는 여자 중학생의 대인관계문제가 긍정반응경향의 감소라는 매개과정을 통해 섭식문제를 증가시킬 가능성을 시사한다. 마지막으로, 이 연구가 이미 섭식문제를 겪고 있거나 섭식문제를 겪을 위험에 놓인 여자 중학생들을 위한 개입과 예방 및 코칭 프로그램 개발에 가지는 시사점, 연구의 제한점, 후속연구를 위한 제언을 논의하였다.

본 연구는 월경전증후군 증상의 지속적인 신체적 고통으로 일상생활과 대인관계에 어려움을 겪고 있는 40代의 중년여성을 대상으로 호흡명상을 실시하여 월경전증후군에 미치는 효과를 규명하고자 한 단일사례연구이다. 연구방법은 ABAB 설계에 따라 제1기저선 단계(A)에서 진단평가 4회기(15일간), 1차 개입단계(B )에서 호흡명상 8회기(25일간), 프로그램 개입을 철회한 40일간의 제2기저선 단계(A )에서 진단평가 2회기, 2차 개입단계(B )에서 호흡명상 8회기(27일간)를 차례로 진행하였다. 이러한 과정을 거쳐 수집된 연구참여자가 느끼는 월경증후군증상에 대한 자기 보고식 호흡명상 전·후 평가지, 월별 월경에 따른 조사 기록지, 척도검사, 상담 축어록, 인터뷰 자료 등을 분석하고 해석한 결과 유의미한 감소를 보였다. 연구참여자의 월경전증후군에서 눈썹, 코, 볼의 경직은 1차에서는 53% 감소, 전신증상은 30% 감소, 근육 통, 소화기계는 24% 감소, 생식기계는 35% 감소가 되었으며 2차에서는 눈썹, 코, 볼의 경직은 12% 감소, 전신증상 은 20% 증가, 근육통, 소화기계는 3.3% 증가, 생식기계는 20%로 감소하였다. 평가질문지 검사 중 신체증상 척도검 사 결과는 1차 개입으로 57점에서 24점으로 33점 감소하였고, 2차 개입에서는 28점에서 29점으로 1점 증가한 것으 로 나타났다. SSI-3/5 검사에서는 1차 개입으로 64점에서 33점으로 31점 감소하였고, 2차 개입으로 42점에서 35점 으로 7점이 감소한 것으로 나타났다. 비수용 억압 검사 결과는 1차 개입으로 57점에서 38점으로 19점 감소하였고, 2차에서는 46점에서 29점으로 17점 감소한 것으로 나타났다. 이러한 결과는 호흡명상이 월경전증후군을 경험하는 여성들의 신체적 고통을 감소시키는데 도움을 줄 수 있을 것이라 여겨진다. 따라서 본 연구자는 월경전증후군 증 상 감소에 대해 안전하고 효율적이라는 정보를 제공하고자 한다.

The purpose of this study was to investigate perception of the Food Allergy Labeling System (FALS) of school foodservice in female middle school students. The subjects were 148 female middle school students in the Incheon metropolitan area. In this cross-sectional study, data were collected using self-administered questionnaires. Only 20.9% of subjects had experience of food allergy education. There was no significant difference in food allergy knowledge by grade. The scores of perception of food allergy labeling by school foodservice were significantly higher in lower grade students (p<0.001). In all grades, highest scores were observed for ‘food allergy labeling is necessary’, whereas the lowest scores were for ‘I check the food allergy labeling’. The percentages of subjects who wanted to participate in food allergy education were significantly different (p<0.01); 73.8% in 1st grade, 50.0% in 2nd grade, and 35.7% in 3rd grade. For desired education contents to enhance perception of FALS, 57.5% of subjects answered ‘emergency management’ and 23.0% said ‘information of food allergy causing food’. Therefore, it is necessary to increase food allergy education and educate female middle school students according to grade in order to enhance perception of FALS.

Since a free-learning semester has been introduced to middle school curriculum, interest in career experience programs has increased. To respond to this new demand, we developed a continuous agriculture-related career experience program linked with STEAM (Science, Technology, Engineering, Arts, and Mathematics) education, and we examined the program’s effects on the job awareness of middle school students. The program was conducted from April 8, 2015 to June 24, 2015, and consisted of 12 classes. The direct experience subprogram was based on 13 different horticultural activities that reflect producing (nine programs), cooking (two programs), and sales (two programs) of horticultural produces. For the indirect experience subprogram, we preliminarily selected 10 representative agricultural jobs, and based on the keywords analyzed from 7 direct experience programs, we chose to introduce seven jobs to the students by videos and the three others by written material. We then investigated the effect of introductory videos on job interest, understanding, and preference by the students. We found that the student’s interest, understanding, and preference regarding each job were significantly improved when direct experience and video watching were combined. Career awareness was improved for gardener (47.0%), nursery grower (42.0%), rural extension official (31.1%), eco-friendly farm material developer (30.9%), agricultural research official (23.4%), plant doctor (19.8%), and agricultural wholesale distribution experts (9.3%). Conclusively, it is expected that career experience programs have the greatest effect on students when both interest in the job and participation on direct experiences are encouraged.

Animal-Assisted Intervention programs and interventions with students are becoming promising field in school and therapeutic settings. Following this trend, Animal-Assisted Intervention (AAI) program was designed to help students adopt more easily to school life and to encourage them to keep healthy relationships with others. Accordingly, the purpose of this study was to identify the effects of animal-assisted intervention (AAI) on the middle school students' sociability and depression. The participants in this study, 8 middle school students residing in Seoul who were interested in animals and agreed to the research attended this program. This study was conducted two times a week for 6 weeks (a total of 12 times) with one main researcher and three research assistants. The major research tool was the test of sociability and depression and the statistical test being used for this study was Wilcoxon's signed ranks. The results were as follows. First, the study showed the significant effects of animal-assisted intervention on sociability for middle school students. There were significant differences in many aspects such as reliability, autonomy, sociability and compliance. Second, significant reductions in anxiety and depression were found after the introduction of animal-assisted intervention for students. Students who participated this program experienced a reduction in depression and stress to some degree. Also, they began to form much more positive friendships and followed school rules as well. Based on the above results, it can be seen that animal-assisted intervention program significantly has the positive effects on the social adaptability and depression of the middle school students. Therefore, this animal-assisted intervention should be considered as a positive program for emotional and psychological support for middle school students.

이 연구는 재교육(학점은행제) 참여가 중년기의 삶의 질에 미치는 영향을 규명하는 것에 그 목적이 있 다. 이를 위해 첫째, 중년기 재교육(학점은행제) 참여자의 사회인구학적 특성을 알아보고, 둘째, 사회인구 학적 특성과 삶의 질의 관계를 살펴보았다. 셋째, 참여자의 사회인구학적 특성이 삶의 질에 어떠한 영향 을 미치는지 분석하였다. 넷째, 중년기의 재교육(학점은행제) 참여가 삶의 질에 미치는 영향을 보기 위해 참여자의 주관적 삶의 질을 사후 조사하였다. 연구의 자료는 경기도 내 전문대학교 1개교, 대학교 1개교, 서울소재 대학교 1개교의 재교육(학점은행제) 참여자 236명의 설문지를 분석에 사용하였다. 연구방법은 SPSS 18.0프로그램으로 중다회귀분석, 사후조사 등을 활용하였다. 평생교육을 통한 재교육 참여가 주관적 삶의 만족도에 미치는 영향을 분석한 주요 결과는 다음과 같다. 첫째, 주관적인 삶의 질에 대한 설문을 통해 자기효능감은 설문 참여자의 83.9%가 향상되었다고 응답하 여 .9%가 향상시켰다. 둘째, 행복감도 높아졌다는 응답자 201명으로 전체의 85.17%로 나타나 중년기 학점은행제 참여가 주관적 행복감을 향상시켰다. 셋째, 자존감의 경우 높아졌다는 응답이 202명으로 전 체의 85.6%로 나타나 중년기 학점은행제 참여가 주관적인 자존감을 향상시켰다. 넷째, 생활만족에 대한 질문에 높아졌다는 응답이 188명으로 전체의 79.7%를 차지하여 중년기 학점은행제 참여가 주관적 생활 만족도를 향상시켰다. 다섯째, 우울감을 묻는 질문에는 낮아졌다는 응답이 235명으로 전체의 99.6%를 차지하였다. 특히 우울감이 매우 낮아졌다는 응답이 전체의 91.53%가 응답하여, 주관적 우울감이 감소 되었다는 응답이 전체 응답자의 99.6%로 나타났다. 이와 같은 연구의 결과로 중년기의 신체적, 사회적, 정서적 변화의 특성에 재교육(학점은행제)이 긍정 적으로 작용하여 삶의 질이 향상되었다. 따라서 중년기의 우울이나 교육에 대한 욕구를 해결하는 방법으 로 학점은행제가 중요하다는 것을 확인 할 수 있었다. 따라서 이 연구는 중년기의 특징을 이해하고 고령 화와 정보사회에 대비한 재교육에 대한 다양한 평생교육 정책 및 제도 개발의 유용한 기초자료로 활용될 수 있을 것이다.

The purpose of this study was to determine the health behaviors and nutritional status related to dyslipidemia in Korean middle-aged adults (between 50 and 64 years old) from the Korean National Health and Nutrition Examinations Survey data (2007~2010). A total of 4,721 subjects were analyzed in this study. The subjects were divided into three groups (normal, borderline, and dyslipidemia) according to serum lipid levels. Parameters included in this study were drinking and smoking, anthropometric parameters, blood and nutritional parameters. The latter parameter included food/nutrients intake. All data was adjusted by sex, region, education level, and age. General linear model and logistic regression model were used for statistical analysis. The dyslipidemia group was comprised of more men than women. By contrast, the borderline group was comprised of more women than men (p<0.001). No significant differences were observed for other general characteristics. There were more smokers and drinkers(drinking per time) in the dyslipidemia group (p<0.05). Anthropometric data showed significant difference, ie, height (p<0.05), weight, body mass index, waist circumference, percent body fat, and blood pressure were higher in the dyslipidemia group (p<0.001). Only blood urea nitrogen showed no significant difference among groups. The HbA1c (p<0.01), fasting blood glucose, GOT, GPT, creatinine levels were higher in the dyslipidemia group (p<0.001). So it is required for the management of obesity in dyslipidemia group. The dyslipidemia group ate less sea food (p<0.05). The nutrients intake of energy and protein, thiamin, riboflavin, niacin, calcium, phosphorus were lower in the dyslipidemia group (p<0.05). Therefore, to lower dyslipidemia prevalence rates, it is necessary to increase the intake of foods containing ω-3 fatty acids. We also suggest a meal management program and nutritional education to recognize the risk of dyslipidemia, especially for people such as the individual in the borderline and dyslipidemia study groups. Key words: dyslipidemia, Korean middle-aged adults, nutritional status, health behaviors

This study examined the reading passages of the National Assessment of Educational Achievement (NAEA) and middle school English textbooks in terms of their readability and lexical difficulty. The readability was measured by using Flesch-Kincaid Grade Level Index, while their lexical difficulty was measured in terms of STTR (standardized type-token ratio), frequency of tokens per type, and vocabulary frequency levels by using VocabProfile and Oxford WordSmith Tools 7.0. The results showed that there was a gap between the readability of the English textbooks and that of the NAEA conducted from 2012 to 2014, while the readability between the English textbooks and that of the 2015 NAEA reached a comparable level. However, the textbooks from one publisher showed substantively lower readability than those from the other publishers and the NAEA. Secondly, regarding vocabulary frequency levels, the words in 1K and 2K accounted for more than 90% of the textbooks and the NAEA, while the NAEA had a higher STTR and lower frequency of tokens per type than the textbooks. It suggests that the NAEA employed more various words with less repetition than the textbooks. Pedagogical implications are discussed.

The objective of this study was to compare the differences between males and females in the mediating effects of academic failure tolerance on the impact of self-efficacy on game addiction among adolescents. The results are summarized as follows. First, in both men and women, self-regulation, one of sub-variables of self-efficacy, had negative effects on game addiction. Second, in men, both emotion and behavior had negative effects on game addiction, while, in women, only behaviour did so. Third, among sub-variables of self-efficacy, in males, self-regulation and task difficulty had positive effects on academic failure tolerance, while, in women, self-regulation, confidence, and task difficulty did so. Fourth, testing the mediating role of academic failure tolerance in the effect of self-efficacy on game addiction showed that there was a partial mediating effect among males, while there was a perfect mediating effect among females. All this implies that there is a need to develop programs that help students maintain positive emotions and behaviors even after they have experienced academic failure, considering the importance of academic failure tolerance for students.