Recently, 3D printing has been actively studied. A representative material in this 3D printing technology is plastic, and PLA, an eco-friendly material, is widely used. FDM is widely used as a way to output these PLA materials. However, this method lacks mechanical properties compared to injection-molded products as it is a method of stacking materials by melting. Therefore, in this study, using an FDM-type 3D printer, a tensile test was performed after printing a tensile specimen with PLA filament with the layer angle and layer density as control factors. After that, changes in tensile properties according to the layer angle and density were compared and evaluated. As a result, to improve the tensile strength, the layer density had to be considered, and to improve the elastic modulus, both the layer angle and the layer density had to be considered.

교통수단과 시설의 도입은 인근 지역의 인구구조, 토지이용, 거주민의 통행행태뿐만 아니라 도시 및 지역 공간구조의 변화를 가져온다. 최근 활발하게 도입이 논의되고 있는 복합환승센터는 이용자들의 환승편의를 증진시켜 대중교통수단 이용을 촉진하고, 대규모 상업/문화시설을 함께 입지시켜 쇼핑/여가활동 인구를 수용하는 역할을 담당하고 있어, 역세권 지역의 인구구조 와 토지이용에 복합적인 변화를 가져오고 있다. 따라서 본 연구는 처음으로 건설된 복합환승센터가 위치한 동대구역 역세권 지역을 대상으로 해당 시설의 입지가 유발하는 공간적 변화를 분석하는 것을 목적으로 한다. 격자와 건축물 단위로 구축된 인구와 토지이용 자료를 버퍼(Buffer)와 고리존(Annuli)으로 집계하였고, 이들의 변화가 통계적으로 유의한 지 모수, 비모수 검정을 통해 확인하였 다. 또한, 주성분 분석을 활용하여 인구와 토지이용 각각의 대표적인 변화를 도출하였으며, 국지적 Moran I를 활용한 LISA 분석을 통해 역세권 내에서도 해당 변화들이 집중적으로 나타난 지역을 격자단위로 확인하였다. 그 결과 동대구역 남쪽에서 업무지구로의 변화가 관찰되었으며, 북쪽으로는 단독주택에서 아파트로의 변화가 관찰되었다. 또한, 업무지구로의 변화가 관찰되는 지역에서 20대 인구의 증가가 확인되었으며, 토지이용이 아파트 중심으로 변화하는 지역에서는 전 연령의 인구 증가가 확인되었다.

본 연구는 전화코칭을 병행한 운동프로그램이 지역사회 거주 독거노인의 균형능력, 악력 및 우 울에 미치는 효과를 조사하기 위한 단일집단 사전사후 원시실험연구이다. 연구대상자는 경기도 S시에 위치 한 노인복지관에 등록된 독거노인 20명이 참여하였으며, 자료수집기간은 2021년 7월 03일부터 2021년 10 월 14일까지 총 12회기 프로그램을 시행하였다. 프로그램 전후에 대상자 가정에 직접 방문하여 4단계 균형 검사, 근력검사, 악력 및 우울을 측정하였다. 중재 프로그램은 탄력밴드와 악력볼을 이용하여 구성하였으며 매주 전화코칭 중재를 제공하였다. 연구결과, 전화코칭을 병행한 운동 프로그램은 대상자의 4단계 균형기 능(3단계)(t=-2.37, p=.029), 4단계 균형기능(4단계)(t=-2.46, p=.024), 우측 악력(t=-2.18, p=.042), 우울 (t=2.82, p<.001)에서 통계적으로 유의한 차이가 나타났다. 본 연구 결과를 바탕으로 전화코칭을 병행한 운 동프로그램은 독거노인의 균형능력, 악력 향상 및 우울 감소를 위한 간호중재로 활용될 수 있을 것으로 기 대된다.

In this study, heavy metals (lead, cadmium, and mercury) and shellfish poisoning toxins (diarrhetic shellfish poisoning toxins, amnesic shellfish poisoning toxins) were investigated in a total of 104 shellfishes. According to the analysis of heavy metals, lead (Pb) was detected in the range of 0.0177-0.5709 mg/kg, cadmium (Cd) was detected in the range of 0.0226-1.4602 mg/kg, and mercury (Hg) was detected in the range of 0.0015-0.0327 mg/kg. Levels of Pb, Cd, and Hg were acceptable by Korean standards. Okadaic acid (OA) and dinophysistoxin-1 (DTX-1) were investigated for monitoring of diarrhetic shellfish poisoning toxins and OA and DTX-1 were not detected. As a result of monitoring of amnesic shellfish poisoning toxins, domoic acid was detected in 5 of 104 samples and detection ratio was 4.8%. The detection period was found as follows; 1 case in January, 1 case in February, 1 case in May, 2 cases in September. These showed that continuous monitoring for the management of shellfish poisoning toxins and heavy metals is required. In addition, this study can be used as reference data to strengthen managing heavy metals in fishery products.

Pleurotus eryngii, a white rot fungus, produces two extracellular lignin-degrading enzymes, laccase and manganese peroxidase (MnP). Owing to these enzymes, P. eryngii efficiently degrades synthetic chemicals such as azo, phthalocyanine, and triphenyl methane dyes. In this study, we investigated the degradation processes of four aromatic dyes, congo red (CR), methylene blue (MB), crystal violet (CV), and malachite green (MG), by P. eryngii under solid and liquid culture conditions. CR and MG were the most quickly degraded under solid and liquid culture conditions, respectively. However, compared to CR, CV, and MG, MB was not degraded well under both culture conditions. The activities of ligninolytic enzymes (laccase and MnP) were also investigated. Laccase was identified to be the major enzyme for dye degradation. A positive relationship between decolorization and enzyme activity was observed for CR, MB, and CV degradation. In contrast, decolorization of MG ensued after high enzyme activity. These results indicate that the degradation process differs between MG and the other aromatic dyes. Therefore, P. eryngii could be a potential tool for the bioremediation of synthetic aromatic dye effluent.

동물복지 향상에 대한 국민적 인식과 요구가 높아진만큼 작년 동물보호법 개정과 지자 체에서도 동물복지팀 신설 등 다양한 활동들이 이루어지고 있다. 말은 동물보호법에 기재 되어 있는 동물 범위에 포함되어 있지만 구체적인 말에 관한 법령은 기재되어 있지 않아 아직까지 국내 경주마에 대한 복지체계는 턱없이 부족하다. 이에 본 논문에서는 국내 경 주마의 육성과 생애를 시작으로 은퇴한 퇴역마까지의 전반적인 삶에 관해 학대 및 도축, 채찍의 측면에서 나누어 해외 사례와 비교 분석한 뒤 국내 경주마 복지의 미비점 및 해결 방안에 대해 고찰하였다. 미국의 경우 2009년 말 학대 방지법과 2011년에는 말 도축 방 지법을 제정하였으며 영국 또한 경주마 관련 법이 존재한다. 1986년 노르웨이에서는 채 찍 사용을 전면 금지하였고 2009년에는 관련 법안을 더 정교하게 개정하였다. 스웨덴 역 시 올해 2022년부터 채찍 사용이 법적으로 제한된다. 이와는 대조적으로 국내 동물보호 법에 말에 관한 사항은 전무하며 이렇기에 다른 국가들에 비해 법적 책임과 복지 측면에 서의 관리 방안들이 미흡하다는 결과가 나타났다. 따라서 국내 경주마의 복지 향상을 위 해서 체계적인 법 규정이 필요한 것으로 보인다.

Density and sound speed contrasts (g and h , respectively), and swimming angle were measured for sandfish (Arctoscopus japonicus) without swimbladder. The density contrast was measured by the volume displacement method while the sound speed contrast was measured by the acoustic measurements of travel time (time-of-flight method). The swimming angle was measured by dividing it into daytime, nighttime, daytime feeding and nighttime feeding. The g was 1.001 to 1.067 with an average (± standard deviation) of 1.032 (± 0.017), and the h was 1.007 to 1.022 with an average (± standard deviation) of 1.015 (± 0.003). The swimming angles (mean ± standard deviation) were 16.8 ± 10.3° during the daytime, 1.9 ± 12.3° during the nighttime, 30.2 ± 12.6° in the daytime feeding and 35.0 ± 13.2° in the nighttime feeding. These results will provide important parameters input to calculate theoretical scattering models for estimating the acoustic target strength of sandfish.

This study aimed to examine cucumber (Cucumis sativus) varieties adaptive to the desert climate by comparing and analyzing the growth, yield, and water consumption. Two long-sized cucumber varieties, ‘Gulfstream’ and ‘Imea’ and two medium-sized cucumbers, ‘Nagene’ and ‘Sausan’ were cultivated in coir substrate hydroponics under hot and humid greenhouse conditions from March 2 to June 20, 2020. On the 113 DAT, ‘Nagene’ had the longest plant height and the highest internode number. The marketable fruit number per plant was higher in the medium-sized varieties, which had more internode number. The marketable fruit number was 31.3 for ‘Gulfstream’, 30.7 for ‘Imea’, 57.8 for ‘Nagene’, or 56.0 for ‘Sausan’ with no significant difference in total fruit weights per plant. The water consumption required to produce 200 g of fruit was lower in the ‘Nagene’ (2.39 L) with the highest water use efficiency (WUE). Therefore, ‘Nagene’ variety may have higher adaptability to desert high temperature compared to the long-sized varieties, and it is going to be necessary to verify more medium-sized cucumber varieties.

The purpose of this study is to monitor the pesticide residues in frozen fruits and vegetables distributed and sold in online and offline markets in Korea. For the study, 107 samples of 34 types of frozen fruits and vegetables were examined, and a total of 341 pesticide residues were analyzed by using multiclass pesticide multiresidue methods of the Korean Food Code. As a result, pesticide residues were detected from 16 of 64 frozen fruits samples and 15 of 43 frozen vegetables samples. Conclusively, residues were detected from 31 samples in total, showing a detection rate of 29.0%. Specifically, pyridaben exceeded the Maximum Residue Limits (MRLs) based on the Positive list system (PLS) in one of the frozen radish leaves, and the violation rate was 0.9%. Detection on frozen fruits and vegetables was made 23 times for 11 types and 36 times for 21 types. In total, 28 types of pesticide residues were detected 59 times. Fungicides were detected the most in frozen fruits, while insecticides were detected the most in frozen vegetables. The most detected pesticides were the insecticide, acaricide chlorfenapyr (5) and the fungicide boscalid (5). Chlorfenapyr was detected only in frozen vegetables, and boscalid was detected in frozen fruits except one.