We aimed to examine the co-doping effects of 1/6mol% Mn3O4 and 1/4mol% Cr2O3 (Mn:Cr=1:1) on the reaction,microstructure, and electrical properties, such as the bulk defects and grain boundary properties, of ZnO-Bi2O3-Sb2O3 (ZBS;Sb/Bi=0.5, 1.0, and 2.0) varistors. The sintering and electrical properties of Mn,Cr-doped ZBS, ZBS(MnCr) varistors werecontrolled using the Sb/Bi ratio. Pyrochlore (Zn2Bi3Sb3O14), α-spinel (Zn7Sb2O12), and δ-Bi2O3 (also β-Bi2O3 at Sb/Bi≤1.0)were detected for all of the systems. Mn and Cr are involved in the development of each phase. Pyrochlore was decomposedand promoted densification at lower temperature on heating in Sb/Bi=1.0 system by Mn rather than Cr doping. A morehomogeneous microstructure was obtained in all systems affected by α-spinel. In ZBS(MnCr), the varistor characteristics wereimproved dramatically (non-linear coefficient, α=40~78), and seemed to form Vo.(0.33eV) as a dominant defect. Fromimpedance and modulus spectroscopy, the grain boundaries can be seen to have divided into two types, i.e. one is tentativelyassigned to ZnO/Bi2O3 (Mn,Cr)/ZnO (0.64~1.1eV) and the other is assigned to the ZnO/ZnO (1.0~1.3eV) homojunction.

PURPOSES : Hollows are easily made, and bearing capacity can be lowered near underground structures because sublayers of pavement settle for a long time due to difficult compaction at the position. If loadings are applied in this condition, distresses may occur in pavement and, as the result, its lifespan can decrease due to the stress larger than that expected in design phase. Although reinforced slab is installed on side of box culvert to minimize the distresses, length of the reinforced slab is fixed as 6m in Korea without any theoretical consideration. The purpose of this paper is investigating the behavior of concrete pavement according to the cover depth of the box culvert ad the length of the reinforced slab. METHODS : The distresses of concrete pavement slabs were investigated and cover depth was surveyed at position where the box culverts were located in expressways. The concrete pavements including the box culverts were modeled by finite element method and their behaviors according to the soil cover depth were analyzed. Wheel loading was applied after considering self weight of the pavement and temperature gradient of the concrete pavement slab at Yeojoo, Gyeonggi where a test road was located. After installing pavement joint at various positions, behavior of the pavement was analyzed by changing the soil cover depth and length of the reinforced slab. RESULTS : As the result, the tensile stress developed in the pavement slab according to the joint position, cover depth, and reinforced slab length was figured out. CONCLUSIONS : More reasonable and economic design of the concrete pavement including the box culvert is expected by the research results.

In order to ascertain the extent to which Korean college students are familiar with the proper use of the English comma, this study examined all the instances of the comma used in a learner corpus consisting of 787 compositions written by Korean college students. All in all, 5,869 tokens of comma errors were identified and subsequently grouped into five categories of errors: (a) omission, (b) addition, (c) wrong substitution, (d) wrong position, and (e) others. A careful examination of these five types of comma errors revealed that the number of tokens in omission was the highest among the five categories, accounting for over half of all the comma errors, and that the students who received higher scores on their essays were just as likely to make comma errors as those who scored lower, a fact which suggests that students with a higher procifiency of English also need instruction on using the comma properly. These results lead to the conclusion that most Korean students are not familiar with contextual uses of the comma and that teaching the comma should be incorporated into English education both at the secondary and at the tertiary level.

본 연구는 돼지 체외수정란의 배양시스템의 최적화를 위하여 수행되었다. 기본배양액으로는 NC-SU-23을 사용하였으며, 실험 1에서는 IGF-I이 각각 0, 1, 10, 100 ng/의 농도로 첨가된 배양액에서 배양하여 분할율, 배반포 발달율과총 세포수를 확인하였다. 농도 경사에 따른 분할율은 차이가 없었으나(65.5%~69.5%), 배반포 발달율에 있어서는 10 ng/의 농도로 첨가하였을 경우가 가장 높았다(P<0.05). 실험 2는 배 아 유전자 활성

The present study aimed to examine the effect of dietary Ptecticu tenebrifer powder mixtures as pet dogfeed ingredients on crude fat and ash digestibility. Three groups of feeds Feed A, Feed B, and Feed C supplied from three farms were fed to a total of 45 dogs. The dietary Ptecticu tenebrifer powder mixture were prepared by mixing 25 g of Ptecticu tenebrifer powder with 100 g of canned food. Feed A, Feed B, and Feed C containing dietary Ptecticu tenebrifer powder mixtures were fed to 15 dogs of each breed of bichon, poodle, and chihuahua that were divided into three groups following a completely randomized design. For measuring the crude fat and crude ash digestibility, manure of each dog breed from each group were collected. Crude fat digestibility was not statistically significant among the dog breeds fed with feed C (p>0.05), but overall there was a statistical difference between the feed and the group by dog breed (p<0.05). In terms of crude ash digestibility, the three types of feed showed differences with respect to dog breeds (p<0.05). However, the group with no significant difference was observed in Feed B by dog breed (p>0.05). In conclusion, feeding Ptecticu tenebrifer powder mixture to dog breeds had no positive effect on the crude fat and ash digestibility and can be used as pet dogfeed ingredients.

This study was conducted to evaluate the effects of sipjeondaebo-tang by-product powder on the growth performance of broilers. A total of 120 broiler chicks (Arbor acres) at 0 days old were assigned to one of two treatments with three replications: control and 1% sipjeondaebo-tang by-product powder. Weight gain at 3 weeks and feed intake at 5 weeks were significantly (p<0.05) influenced by the sipjeondaebo-tang by-product powder treatments. However, there were no significant differences in the feed conversion ratio between treatments as a function of treatment time (p>0.05). Overall, weight gain and the feed conversion ratio were slightly greater for the sipjeondaebo-tang by-product powder treatment than the control treatment. It was concluded that sipjeondaebo-tang by-product powder may be an appropriate source of feed additive, without any negative effects on the growth performance of the broilers.

This study aimed to investigate the effects of dietary Ptecticus tenebrifer on the fecal microbiomes of bichon frise. A total of 16 bichon frise dogs (average weight, 2 kg) were randomly allotted to 4 dietary treatments (4 dogs/group): general pet food, two types of domestic pet food containing Ptecticus tenebrifer, and one imported pet food containing Ptecticus tenebrifer. In the controls, Firmicutes accounted for the highest proportion (82%) at the phylum level in the fecal microbiomes. The Tax4Fun2's functional prediction program indicated that the control groups showed a relatively high amount of obesity-related microorganisms; the pathways included three types of carbohydrate metabolism. Among the treatments, Firmicutes abundances was the least in the treatments with the two types of domestic pet food containing Ptecticus tenebrifer; this did not affect the functional prediction of Tax4Fun2. In conclusion, the two types of domestic feed with Ptecticus tenebrifer were healthy and suitable for bichon frise; they could be beneficial in terms of obesity.

This study investigated the effects of dietary Ptecticu tenebrifer powder and canned mixtures on protein digestibility by different breeds of companion dogs (15 Bichons, 15 Malteses, 15 Chihuahuas and 15 Poodles). The mixtures were divided into Diet A, Diet B, Diet C, Diet D, and Diet E, which were supplied from five farms. Twenty-five grams each was mixed with 100 g of each canned food, and a total of 125 g was measured for each breed of dog. The result of component analysis of the mixtures showed the highest protein contents rather than dry matter, crude ash or crude fat. There were statistical significances (p<0.05) in all mixed feeds fed to bichon, maltese, chihuahua and poodle dog. Overall, protein digestibility by the breeds of dog ranged from 87.44% to 97.18%. Result of breed of dog comparison revealed that Diet E by poodle dog had the highest protein digestibility, and the lowest protein digestibility was observed in Diet C by Maltese. In conclusion, the use of dietary Ptecticu tenebrifer powder and canned mixtures did not only increased protein digestibility by different breeds of dog but also maintained normal manure properties.

The present study evaluated the blood profile and meat color of ducks with Houttuynia cordata (H. cordata) pellets in their diets. In total, 120 pekin ducks (1-d-old) were used in a 42 d growth trial. Ducks were randomly allocated to six pens and exposed to three replicates of two treatments: (1) controls as basal diet and (2) basal diet + 2% H. cordata pellets (T1). Total-cholesterol, HDL-cholesterol, triglyceride contents or L* and b* vaules revealed significant difference (p>0.05) in compared with those in the controls; however, dietary supplementation of H. cordata pellets did not affect (p>0.05) LDL-cholesterol, VLDL-cholesterol and a* values. In conclusion, the inclusion of 2% H. cordata pellets improved HDL-cholesterol and meat color in duck breast and thigh meats, which further reduced other cholesterol values.

Extreme low temperature has various effects on society. It has negative impacts on health, industry, agriculture, and transportation during winter season. Therefore, extreme low temperature is recognized as main factor that causing traffic accidents. This study analyzed the relationship between low temperature and traffic accidents from 2012 to 2018. This study also compared the differences in vulnerability to low temperature between urban and rural areas. Generalized Additive Model (GAM) and Poisson regression model are used to estimate the thresholds and the level of traffic accidents. The results show that the thresholds tend to be decreased gradually, but the level of traffic accidents are more likely to increase in both urban and rural areas Comparatively, rural areas are more vulnerable to traffic accident caused by drop in temperature than urban areas.

본 연구는 낙지다리(Penthorum chinense Pursh) 추출물을 기능성 화장품소재로 개발하기 위해 (−)‑epicatechin gallate를 지표성분으로 선정하고, 품질관리를 위해 High Performance Liquid Chromatography (HPLC)를 이용하여 분석법을 개발하였다. 분석에 사용된 칼럼은 Unison US-C18 (4.6 × 250 mm, 5 μm, Imtakt, USA)을 사용하여 0.05% (v/v) trifluoroacetic acid (TFA)와 메탄올을 이동상 조건으로 컬럼 온도는 30 ℃ 에서 유속은 1.0 mL/min 로 검출파장은 280 nm에서 검출하였다. International Conference on Harmonization (ICH) 가이드라인(version 4, 2005)을 근거로 하여 특이성, 직선성, 정밀성, 정확성, 검출한계 및 정량한계를 분석하여 분석방법을 검증하였다. 검출한계 및 정량한계는 각각 0.11 mg/mL 및 0.33 mg/mL로 나타났으며, 검량곡선은 상관계수값이 0.9999로 양호한 직선성을 보였고, 정밀성 분석결과 도 0.6% 이하로 확인하였다. 또한, 회수율은 99.51 ~ 101.92% 범위로 정확성이 있음을 알 수 있다. 따라서, 본 분석법은 낙지다리 추출물의 지표성분의 분석법은 적합한 시험법임이 검증되었다.

이 연구는 전문적 텍스트를 함께 읽고 토론하는 교사독서모임이 교사의 전문성 발달에 가지는 교육적 의미를 탐색하는 데 그 목적이 있다. 특히 이 연구는 교사독서모임을 통해 교사들이 어떠한 전문적 정체성을 발달시켜 가는지, 이러한 전문적 정체성 발달에 영향을 미치는 교사독서모임의 주요한 특성이 무엇인지를 이해하고자 하였다. 이러한 연구목적을 달성하기 위해, 본 연구에서는 한 교사의 교사독서모임 참여경험에 대한 내러티브 탐구를 수행하였다. 연구 결과, 교사독서모임은 반성적 실천가이자 연계적 전문가로서의 교사 전문적 정체성 발달에 기여하고 있는 것으로 나타났다. 또한 교사의 전문적 정체성 발달에 있어 교사독서모임에서 함께 읽는 교육철학적 텍스트와 교사들 사이의 협력적 반성이 상당히 중요한 역할을 하고 있는 것으로 나타났다. 이러한 연구결과를 토대로, 교사발달과 교육과정 운영에 있어서의 교사독서모임의 중요성이 논의되었다.

The objective of this study was to compare antioxidant activities of green tea, rosemary, lemon and bamboo leaves extracts using three different extraction methods (80% ethanol sonication extraction, distilled water autoclave extraction, distilled water extraction at room temperature). As a result, green tea and rosemary extracts showed relatively high antioxidant activities compared with those of lemon and bamboo leaves. These green tea and rosemary extracts were subsequently added to soymilk and their mixtures were examined for antioxidant activities. Soymilk added with 10% green tea distilled water autoclave extracts and distilled water at room temperature extracts showed relatively high DPPH, 85.09±2.26%, 84.38±1.97%, and ABTS radical scavenging activities, 73.43±2.78%, 81.34±4.78%, respectively. On the other hand, soymilk added with 10% rosemary distilled water autoclave extracts showed remarkably higher DPPH radical scavenging activity while their ABTS radical scavenging ability was similar to that of non-added soymilk. In conclusion, our results suggest that the addition of green tea distilled water autoclave extracts, distilled water at room temperature extracts and rosemary distilled water autoclave extracts to soymilk could contribute to the development of added value soymilk products with increased antioxidant activities.

최근 청소년 범죄는 숫자적으로는 감소하는 양상을 보이고 있지만 범죄의 강도는 더 강해지고 범죄내용 또한 심각해지고 있으며 재발의 가능성이 높다는 점이 사회적으로 시급한 문제로 대두되고 있다. 이러한 소년 범죄 청소년들은 심리적 혼란의 시기인 청소년기를 겪으며 스트레스를 유발하여 다양한 정서 및 행동문제를 일으키는 것으로 보고되고 있다. 이에 따라 본 연구는 원예치료프로그램이 남자 소년원 생들의 심리적 스트레스에 미치는 영향을 알아보고자 전라북도 전주에 소재한 남자소년원생을 대상으로 원예치료 프로그램에 참가한 실 험군과 참여하지 않은 대조군으로 구성하여 수행하였다. 두 그룹의 스트레스 변화를 측정하기 위하여 사전, 사후 모세혈관을 통한 심박변 이도를 측정하였으며, 실험군에 원예치료 프로그램을 12회기 실시하고 회기 중 프로그램 시작 전과 종료 직후 심박변이도를 측정하였다. 그 결과 집단에 따른 주효과는 유의미한 것으로 나타났으며, 사전 스트레스 지수를 공변량으로 처리하였을 때 집단 간 사후 스트레스 지수 에 유의미한 차이가 있는 것으로 나타났다. 또한 실험집단을 대상으로 회기별 스트레스 지수의 변화를 분석한 결과 스트레스 지수는 1차시 이후 지속적으로 감소하는 결과를 보여주었다. 이러한 연구 결과는 원예치료 프로그램이 소년원생들에게 스트레스를 주는 외부환경에 적 응하는 힘을 향상시켜주고 분노, 근심, 공포상태의 심리적 양상들을 완화 시켜주는데 기여했음을 나타내주는 결과라고 할 수 있다. 따라서 보호기관에 수용되어있는 문제 청소년들에게 적합한 다양하고 전문화된 인성교육 원예치료 프로그램이 보다 더 적극적으로 연구 개발 되 어야 한다고 판단된다.