• 농업과학연구
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• 제44권4호
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• pp.549-557
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• 2017

As exchanges between countries become more active, new threats such as drugs, illegal imports of food and medicines, and terrorism are present all over the world. From this, increased border security that protects people's safety is becoming a new issue. The activities of special purpose dogs that detect these threats in advance are becoming very important. One of the obstacles in securing superior individuals is musculoskeletal disorders which interfere with the work of special purpose dogs. In order to search for genes associated with these genetic disorders, we conducted genomic analysis using linkage disequilibrium information and investigated genetic characteristics to know heterozygosity and inbreeding status in the population. In this study, two breeds (Malinois, Shepherd) of army dogs and three breeds (Malinois, Shepherd, Retriever) from public databases were used for comparison. The 170K SNP marker panel was used for this study. In the principal component analysis, it was confirmed that clusters were formed for each breed. The number of effective populations differed for each cultivar, but this was due to the difference in numbers of individuals for each breed used for the analysis. The results of heterozygosity decay analysis showed that heterozygous alleles decreased with each generation. In the army dog group, if the population number is maintained properly, the frequency of allele genotype will not decrease significantly.

• 한국조리학회지
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• 제20권5호
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• pp.43-51
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• 2014

The purpose of this study is to assess the sanitation level and purchase behavior of fishery products, and to identify management conditions of bad smell from cooking fish at home as perceived by housewives in a metropolitan area. Frequency analysis, descriptive analysis, and cross-tabulation analysis were employed as statistical techniques for current study. Total 270 were collected from housewives. The statistical variables included the kinds of cooking oil and the age of housewives, the types of hoods for fish roasting, the types of covers for fish grills, the number of family, the ventilation methods, and the maintenance of kitchen utensils based on family incomes, and they showed statistically significant differences(p<.05). Furthermore, the housewives whose sanitary cognition level for fishery products was high, the housewives whose level of purchase attitude was relatively high, and the housewives who utilized specialized kitchen utensils demonstrated statistically significant differences(p<.05). It resulted from the assessment of such actual conditions as difference of culinary environment according to the sanitation level of fishery products, the level of purchase attitude, and whether the housewives utilized special kitchen utensils or not. The more efforts were proved from those who had the intentions for improvement of an amenable culinary environment at homes, according to the higher income obtainers, the smaller nuclear family, the younger generation, whether the housewives utilized special kitchen utensils or not, and those who had the higher sanitary cognition level of fishery products. The above results were derived from an individual lifestyle or a dietary lifestyle, but eventually this seems to be related with the propensity and values hierarchy of individuals.

• 한국수소및신에너지학회논문집
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• 제26권6호
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• pp.638-644
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• 2015

This paper describes the continuing effort to analysis and design on dynamic and electrical behavior of gamma-type free piston Stirling engine/generator with dual-opposed linear generator for domestic micro-CHP (Combined Heat and Power) system. The double acting Stirling engine/generator has one displacer and two power piston which are supported by flexure springs. Two power pistons oscillate with symmetric sinusoidal displacement and are connected with moving magnet type linear generators for power generation. To operate Stirling engine/generator, combustion heat of natural gas is supplied to hot-end and heat is rejected from cold-end by cooling water. The temperature difference across the displacer induces the oscillating motion, and it can be explained with mass-spring vibration system. The purpose of this paper is to describe the design process of linear generator for the double acting free-piston Stirling engine.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2011년도 추계학술발표대회
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• pp.20.1-20.1
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• 2011

The nano-sized quantum structure has been an attractive candidate for investigations of the fundamental physical properties and potential applications of next-generation electronic devices. Metal nano-particles form deep quantum wells between control and tunnel oxides due to a difference in work functions. The charge storage capacity of nanoparticles has led to their use in the development of nano-floating gate memory (NFGM) devices. When compared with conventional floating gate memory devices, NFGM devices offer a number of advantages that have attracted a great deal of attention: a greater inherent scalability, better endurance, a faster write/erase speed, and more processes that are compatible with conventional silicon processes. To improve the performance of NFGM, metal nanocrystals such as Au, Ag, Ni Pt, and W have been proposed due to superior density, a strong coupling with the conduction channel, a wide range of work function selectivity, and a small energy perturbation. In the present study, bismuth metal nanocrystals were self-assembled within high-k $Bi_2Mg_{2/3}Nb_{4/3}O_7$ (BMN) films grown at room temperature in Ar ambient via radio-frequency magnetron sputtering. The work function of the bismuth metal nanocrystals (4.34 eV) was important for nanocrystal-based nonvolatile memory (NVM) applications. If transparent NFGM devices can be integrated with transparent solar cells, non-volatile memory fields will open a new platform for flexible electron devices.

• 복식
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• 제56권4호
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• pp.33-47
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• 2006

In 21 century, the ubiquitous environment is advanced fast through the so-called digital convergence. This research experts what is the next generation of traditional fashion product purchase behaviors. The purpose of this study is to analyze the fashion product purchase decision making in the development stages of ubiquitous environment. The quantitative Investigation was executed for 487 collegians and the data were analyzed with Frequency, percentage, ANOVA, Duncan test and multiple regression by using SPSS win version 10 package. The results of this research were as followed: First, in the 1st stages of ubiquitous developmental environment, using internet pc or mobile phone was analyze the difference between fashion shopping orientation group and purchase restricted factor Second, as a result of the factor analysis of the ubiquitous 2nd stages, four lower dimensions were made: giving information; wearable effect, buying facility; interest from purchase. as a result of ANOVA, there were any differences between fashion shopping orientation group and ubiquitous 2nd stages. Third, in the 3rd stages of ubiquitous developmental environment, there are differences between fashion shopping orientation group and ubiquitous 3rd stages. And the result from regression analysis of the ubiquitous 2nd stages and 3rd stages showed that buying facility factor in increasing need recognition, wearable effect factor in fashion information acquisition, giving information factor in have a intention to buy in ubiquitous #3 rendition are most influential.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제35권1호
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• pp.31-34
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• 2009

Purpose: This study compared the frequency of postoperative infections in patients for a closed mandibular fracture with that without the postoperative antibiotic prophylaxis. Patients and Methods: 48 patients without any specific medical history were divided into two groups depending on whether or not antibiotics had been applied after the surgery. The 24 patients in group 1 received only a second-generation cephalosporin ($Cefotetan^{(R)}$) intravenously from admission to immediate after the surgery. Likewise, 24 patients in group 2 received 1.0g of $Cefotetan^{(R)}$ twice daily longer than the third day after surgery. The mean (SD) duration of antibiotics administration after surgery was 6.9 (${\pm}3.56$). The patients were evaluated after surgery for any postoperative infections according to the criteria: purulent drainage from a wound, spontaneous wound dehiscence accompanied by swelling, pain, and fever around the wound. Results: Postoperative infections were encountered in 2 out of 24 patients in group 1, who received antibiotic medication until shortly after surgery, and in 3 out of the 24 patients in group 2, in whom the medication was continued even after the surgery. There was no sig nificant difference in the incidence of postoperative infections between the two groups. Conclusion: From this study, postoperative use of antibiotics seems to be unnecessary with view of the little significance of the factors that could affect the wound infection.

• 한국물환경학회지
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• 제31권3호
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• pp.241-252
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• 2015

Runoff behaviors by five bias correction methods were analyzed, which were Change Factor methods using past observed and estimated data by the estimation scenario with average annual calibration factor (CF_Y) or with average monthly calibration factor (CF_M), Quantile Mapping methods using past observed and estimated data considering cumulative distribution function for entire estimated data period (QM_E) or for dry and rainy season (QM_P), and Integrated method of CF_M+QM_E(CQ). The peak flow by CF_M and QM_P were twice as large as the measured peak flow, it was concluded that QM_P method has large uncertainty in monthly runoff estimation since the maximum precipitation by QM_P provided much difference to the other methods. The CQ method provided the precipitation amount, distribution, and frequency of the smallest differences to the observed data, compared to the other four methods. And the CQ method provided the rainfall-runoff behavior corresponding to the carbon dioxide emission scenario of SRES A1B. Climate change scenario with bias correction still contained uncertainty in accurate climate data generation. Therefore it is required to consider the trend of observed precipitation and the characteristics of bias correction methods so that the generated precipitation can be used properly in water resource management plan establishment.

• 전력전자학회논문지
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• 제9권5호
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• pp.457-466
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• 2004

본 논문에서는 태양광 컨버터로서 변형된 벅-부스트 컨버터를 제안하고 분석하며, 출력을 증가시키고 출력전압의 리플을 저감하기 위한 새로운 병렬 구동 기법을 제안한다. 변형된 컨버터의 입ㆍ출력 관계는 기존의 승압형 컨버터인 부스트 컨버터와 동일하지만, 출력단자의 구성을 변형시켜 출력 콘덴서의 동작전압과 커패시턴스 용량을 저감시킬 수 있는 장점을 가진다. 또한 변형된 컨버터와 전류 제어 기법을 이용하는 제안된 병렬구동 기법은 기존병렬 구동 방식의 전류 분배에 대한 불평등 문제를 해결할 수 있으며, 부가적인 스위칭 손실의 증가 없이 등가 스위칭 주파수를 증가 시킬 수 있어 출력전압 리플 저감에 효과적이다. 제안된 병렬 구동 기법의 타당성을 컴퓨터 시뮬레이션과 실험을 통하여 입증한다.

• 한국방사선학회논문지
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• 제13권2호
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• pp.233-239
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• 2019

본 연구는 방사선 비전공 대학생들을 대상으로 방사선사용에 관한 지식 및 인식을 분석하고자 설문조사를 실시하였다. 회수된 설문을 바탕으로 빈도, 평균과 표준편차, t-test, one-way ANOVA를 사용하였다. 그 결과, 방사선의 기본 지식과 사용 분야에 관한 지식 정도는 성별과 연령에서 집단 간 큰 차이는 나타나지 않았다. 전공 계열에서는 일부 항목에서 통계적 차이가 나타났다. 또한 방사선에 대한 인식에서는 여자와 25세 미만에서 더 부정적인 것으로 나타났다(p<0.05). 하부 요인 간 상관관계 분석 결과 방사선 지식이 높을수록 사용 분야의 지식과 방사선사용 인식이 높게 나타났다. 대학생들은 앞으로 사회에 진출하여 방사선 인식을 제고 하는데 영향력이 크다는 점에서 방사선에 대한 올바른 인식이 전달된다면 방사선 산업 발전에 기여하는 긍정적 효과를 나타낼 것으로 판단된다.

• 인간식물환경학회지
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• 제24권2호
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• pp.229-244
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• 2021

Background and objective: The purpose of this study was to comprehensively analyze the user behavior in order to cope appropriately with the increasing demand for mountain usage of those in their 20s and 30s and to allocate resources efficiently. Methods: To analyze the behavior of mountain hiking users, an exploratory data analysis (EDA) was conducted on the data which had been collected in the app Tranggle. The main target are users in their 20s and 30s who visited the mountains in the metropolitan area in 2019-2020. Among them, we have selected data on the top 13 mountains based on the frequency of visits. After data pre-processing, mountain usage patterns were analyzed through statistical analysis and visualization. Results: Compared to 2019, the number of users in 2020 increased 1.36 times. The utilization rate of the well-established hiking trails has also increased. The usage of mountain on weekends (Saturday > Sunday) was still the highest, and the difference in the usage between the days of the week decreased. Outside of work hours, early morning usage has increased and night-time usage has decreased. There was no significant change in usages depending on activity type, level (experience point) and exercise properties. Conclusion: Since the COVID-19 outbreak, the usage of mountains has been changing towards low user density and short-distance trip. in the post-COVID-19 era, the function and role of forests in daily life are expected to increase. To cope with this, further research needs to be carried out with consideration of the wider demographic and social characteristics.