For performance analysis of flood prevention projects, this study performed simulation (SWMM) for the five sites where the projects have been completed. The models were constructed using watershed and sewer information of the project sites and were verified using flood records in the past to improve accuracy. In this simulation, the design rainfall data (probability 30~50 years) and the rainfall data in the summer of 2017 were applied. When the design rainfall data was applied to the models, simulation results presented that all the sites were flooded before the projects, but after the projects all the sites were not flooded due to improve discharge capacity. And when the rainfall data in the summer of 2017 was applied to the models, simulation results presented that all the sites were flooded before the projects, but after the projects any sites did not occur flooding in this summer. So if the projects had not been completed, all the sites might be flooded in the summer of 2017. These effects were analyzed as the improvement of discharge capacity due to rehabilitation of sewer, construction of underground tunnel and pumping station, etc. As the results, ratio of sewer that water depth exceed diameter reduced from 52.3~75.8% to 17.1~39.8%.

본 연구의 목적은 문헌고찰을 근거로 보호관찰정보시스템 입력 정보 중 전자발찌 부착 성폭력범죄자의 재범 유발 변인을 선정하고 해당 변인과 재범 여부의 관련성을 실증적으로 확인하는 것이다. 이와 같은 목적을 달성하기 위해서 본 연구는 보호관찰 정보시스템에서 총 440명의 전자발찌 부착 성폭력범죄자를 무작위로 추출해서 DB를 구축하였다(비재범자: 220명, 재범자: 220명). 구축된 DB를 대상으로 이항 로지스틱 회귀분석을 실시한 결과, 전자발찌 부착 성폭력범죄 이전의 범죄 경력 중 이전 총 범 죄횟수와 이전 성폭력범죄횟수는 재범과 유의미한 정적인 관련성이 있었다. 또한 처벌 강도 중 전자발찌 부착기간은 재범과 유의미하게 정적으로 관련된 것으로 나타났다. 반면 사회적 결속과 관련해서 전자발찌 부착 성폭력범죄자가 직업이 있거나 배우자가 있는 경우가 직업이 없거나 배우자가 없는 경우보다 재범률이 유의미하게 낮았다. 마지막으로 이상의 연구 결과를 토대로 본 연구는 전자발찌 부착 성폭력범죄자의 재범 예방 정책을 제안하였다.

Collaborative filtering, one of the most widely used techniques to build recommender systems, is based on the idea that users with similar preferences can help one another find useful items. Credit card user behavior analytics show that most customers hold three or less credit cards without duplicates. This behavior is one of the most influential factors to data sparsity. The ‘cold-start’ problem caused by data sparsity prevents recommender system from providing recommendation properly in the personalized credit card recommendation scenario. We propose a personalized credit card recommender system to address the cold-start problem, using multiple user profiles. The proposed system consists of a training process and an application process using five user profiles. In the training process, the five user profiles are transformed to five user networks based on the cosine similarity, and an integrated user network is derived by weighted sum of each user network. The application process selects k-nearest neighbors (users) from the integrated user network derived in the training process, and recommends three of the most frequently used credit card by the k-nearest neighbors. In order to demonstrate the performance of the proposed system, we conducted experiments with real credit card user data and calculated the F1 Values. The F1 value of the proposed system was compared with that of the existing recommendation techniques. The results show that the proposed system provides better recommendation than the existing techniques. This paper not only contributes to solving the cold start problem that may occur in the personalized credit card recommendation scenario, but also is expected for financial companies to improve customer satisfactions and increase corporate profits by providing recommendation properly.

In this study, the homogeneity and stability of standard samples for proficiency testing in indoor air quality within the country (formaldehyde, benzene, toluene, ethylbenzene, p-xylene, styrene, TVOC) were evaluated. The procedures and statistical analysis methods applied in ISO/IEC 13528 (2009) and KS A ISO Guide 35 (2005) were applied as evaluation methods. The homogeneity evaluation was a statistical analysis of repeated measurements of each of the 11 ports and between the 11 ports concentration data. As a result, the coefficient of variation (CV) was within the range of 1.9%~5.9%. The difference between the ports was found to be insignificant and met the statistical standard specified in KS Q ISO 13528. The stability evaluation was assessed by the change in concentration over the long-term stability of the standard samples stored for 90 days. The coefficient of variation (CV), which was within the range of 2.6%~9.0%, exhibited changes in the concentration of the long-term stored standard samples. However, the results satisfy the statistical standard specified in KS A ISO Guide 35. Overall, there is no significant difference between the homogeneity of the standard samples by the port and the stability of the long-term stored samples. Therefore, it is considered to be an appropriate method to supply standard samples in an indoor air quality proficiency test.

This paper uses finite element analysis to analyze the equivalent stress and fatigue duration distributed in the timing belt pulley of the rotating part. The pulley structure used for analysis was categorized into one body type and separate axis type and their characteristics were analyzed when materials S45C and SCM440-870C were applied. A static structural analysis and durability analysis show that when external forces are applied to the pulley, the separate axis structure is structurally safer and more favorable in terms of fatigue, compared to the one body. In addition, the separate axis structure using SCM440-870C material was found to have the best safety factor at 10.4 and infinite fatigue life. These findings are expected to be useful when manufacturing timing belt pulleys.

The SLIM AU composite beam consists of U-shaped steel plate, A-shaped steel cap and infilled concrete. The bottom steel plate acts as tension bars, and the top steel cap takes roles of shear connector and compression bars in the conventional reinforced concrete section. In this paper the shear strength of this composite beam with closed steel section has been evaluated through the concentrated loading shear experiments. Test results under the symmetrical and asymmetrical loading conditions were compared with the predicted values based on the KBC 2016. The composite beam showed the greater shear strength capacities than those of the theoretical evaluation.

This paper aims to reveal the effects of the K- turbulence model on the performance analysis of battery cooling system for electric vehicle. The maximum temperature, the difference of temperature, and temperature distributions on the battery module were compared with and without K- turbulence model under the different flow rate. It can be expected that the maximum temperature of K- turbulence model is corrected by using the average error rate without the result of K- turbulence model.

Seafood is attracting attention as a future food industry. In recent years, the demand for fishery equipment of mechanization, automation, and unmanned was increased due to the environment affected by seafood processing, stricter regulations on safety, decline and aging of fishery worker. Ark shell (Scapharca subcrenata) was being produced in many steps in the production process. The process has been made such as collection–landing–washing–first sort (goods/non-goods)–transports– second sort (size). It was undergone first and second steps by delivering to the consumer. Here, the first step is to sort goods to collection and the second step is to sort by size. The fishery workers need ten people in first step and six people in second step. The workload of one hour per kg is 4,247 kg/h in first step and 2,213 kg/h in second step. In addition, the goods ratio by work process was 79% in first step and 98% in the second step. In this process, a lot of fishery worker and working time is needed. Therefore, this study developed elemental techniques for an automated size sorting system considering the working process problem, time and situation for washing and sorting of ark shell.

It is very important to treat infected livestock carcasses safely and quickly. In this study, the degradation characteristics and odor generation characteristics of carcasses were investigated during the treatment of swine carcasses using the anaerobic burial composting method. While the carcasses were decomposed, the temperature remained high, at 40~55°C on average, and most of the carcasses were decomposed rapidly. The major odorcontributing substances in the buried composting method are sulfuric odor substances such as H2S, CH3SH, dimethyl sulfide (DMS) and dimethyl disulfide (DMDS), and the odor contribution of these substances is 93~99%. Among them, CH3SH, which accounts for about 56~89% of odor contribution, was the most representative indicator substance. Despite the anaerobic digestion process, the methane concentration in the digestion process was as low as 0.5~0.8% at the burial point of the carcass. The odor and methane produced during the decomposition of the carcasses decreased considerably during the discharge to the surface layer through the buried layer consisting of compost. These results suggest that anaerobic high temperature burial composting is one of the most useful methods to treat carcasses of infected livestock.

In order to reduce odor and methane emission from the landfill, open biocovers and a closed biofilter were applied to the landfill site. Three biocovers and the biofilter are suitable for relatively small-sized landfills with facilities that cannot resource methane into recovery due to small volumes of methane emission. Biocover-1 consists only of the soil of the landfill site while biocover-2 is mixed with the earthworm casts and artificial soil (perlite). The biofilter formed a bio-layer by adding mixed food waste compost as packing material of biocover-2. The removal efficiency decreased over time on biocover-1. However, biocover-2 and the biofilter showed stable odor removal efficiency. The rates of methane removal efficiency were in order of biofilter (94.9%)>, biocover-1(42.3%)>, and biocover-2 (37.0%). The methane removal efficiency over time in biocover-1 was gradually decreased. However, drastic efficiency decline was observed in biocover-2 due to the hardening process. As a result of overturning the surface soil where the hardening process was observed, methane removal efficiency increased again. The biofilter showed stable methane removal efficiency without degradation. The estimate methane oxidation rate in biocover- 1 was an average of 10.4%. Biocover-2 showed an efficiency of 46.3% after 25 days of forming biocover. However, due to hardening process efficiency dropped to 4.6%. After overturn of the surface soil, the rate subsequently increased to 17.9%, with an evaluated average of 12.5%.

‘후지’ 사과(Malus×domestica Borkh.)에 1.0μL·L-1 1- MCP를 처리하거나 또는 1-MCP 처리 후 10μL·L-1 에틸 렌가스를 살포(1-MCP+에틸렌)하여 180일간 0.5oC 저온에서 과실의 저장성을 조사한 후에, 28일 동안 상온에서 보관하면서 연화정도를 비교하였다. 1-MCP 또는 1- MCP+에틸렌 처리된 과실의 산함량과 경도는 저온저장 120일 이후부터 높은 수준으로 유지되었고, 이후 상온보관 28일 동안에서도 높게 나타났다. 1-MCP처리 과실은 저온저장+상온보관 동안 14N 이상으로 경도가 유지되었다. 과피 적색도는 저온저장 기간 중에는 처리에 따라 일관성 있는 결과가 나타나지 않았지만 상온보관 21일 과 28일째에서는 1-MCP처리에 의하여 4.0 이상 높은 수준이 유지되었다. 대조구와 에틸렌 처리구는 저온저장 90일차에 에틸렌과 호흡량이 크게 상승되었고 클라이매 터릭 맥시멈이 지나면서 노화가 더 빨리 진행된 것으로 판단되었다. 따라서 1-MCP가 처리된 과실은 10μL·L-1정도의 에틸렌에 노출되더라도 장기간 저온저장과 약 한달 간의 상온저장 동안 상품성 유지가 가능한 것으로 평가되었다.

목적: 본 연구는 –2.00D 이하의 난시를 가진 사람에게 콘택트렌즈 처방 시 구면등가대등법에 의한 구면 콘택트렌즈가 토릭 콘택트렌즈와 비교하여 시력, 자각적 만족도의 차이가 어느 정도인지 확인하고자 하였다. 방법: 전신질환 및 안과적 수술경험이 없고 실험의 취지를 이해하고 동의한 교정시력 1.0 이상의 남녀 6명을 대상으로 하였다. 구면과 토릭콘택트렌즈는 동일한 재질과 베이스커브의 콘택트렌즈를 사용하였으며, 콘택트렌즈 피팅을 위해 문진, 전안부검사, 각막곡률검사, 굴절검사, 피팅 평가 등을 실시한 후 교정시력과 착용 후 자각적 만족도(건조감, 이물감, 흐림, 눈부심, 두통, 가려움증, 충혈 등) 조사를 실시하였다. 결과: 난시도수에 따라 그룹A(-1.00D 미만), 그룹B(-1.00D ~ -2.00D)으로 나누어 등가구 면콘택트렌즈 처방결과 착용 시간이 길어짐에 따라 시력교정에 대한 만족도 낮았으나, 토릭 소프트콘택트렌즈의 경우 착용 시간에 상관없이 만족도가 매우 높게 조사되었다. 또한 등가 구면 콘택트렌즈의 처방 교정시력은 그룹 A(난시도수 -1.00D미만)의 경우 교정시력의 만족 도가 낮게 나타났으며, 그룹 B(난시도수 -1.00D~-2.00D)의 처방 교정시력에서는 등가구 면 처방된 콘택트렌즈에 비해 시력 향상과 높은 만족도를 보였다. 결론: 두 그룹 모두 구면 소프트콘택트렌즈와 토릭 소프트콘택트렌즈에서 시력향상에 유의한 차이를 보였으나, 자각적 만족도를 함께 비교한 결과 토릭 소프트콘택트렌즈를 처방할 경우 시력 향상과 안정피로 개선에 도움이 되기 때문에 난시 콘택트렌즈처방에서 토릭 소프트콘택트렌즈를 처방이 우선되어야 할 것으로 생각된다.

‘원황’ 배(Pyrus pyrifolia Nakai)나무에 착과수준을 주당 54개(60%착과), 90개[100%착과구(관행)], 126개 (140%착과)로 조절 하였을 때 가지의 생장, 저장양분 및 과실생산과 익년에 삽수의 생장에 미치는 영향을 조사하기 위하여 2년간 수행되었다. 주당 착과량이 증가하면 도장지 생장이 감소하였고 1년생 가지의 탄수화물 과다량 무기원소 및 유리당 농도가 감소하는 경향이 나타났다. 관행 대비 140% 착과처리구는 두 해 모두 수량이 약 35톤으로 가장 높았지만 평균과중과 과실 크기 및 과육당도는 다소 낮은 수준이었다. 하지만 140% 착과처리구는 60%와 100% 착과 처리구 보다 년간 천 만원 이상의 소득증대가 관찰되었다. -20oC 처리에서 삽수의 발아율은 뚜렷한 감소가 나타나지 않았고, - 30oC에서는 140% 착과처리구에서 70% 이하로 감소되었다. 저온에서 삽수의 전해질 누출률은 적과수준에 따라서 크게 차이는 없었다.

심리치료의 궁극적인 목표는 특정한 심리적 문제를 유발하는 근본적 원인을 파악하여 이를 수정하고 변화시키는 것이다. 본 연구는 이와 같은 관점에서 최근 사회적 문제로 급부상하고 있는 SNS 중독의 근본 원인을 파악해서 향후 심리치료 프로그램 개발에 도움을 제공하고자 한다. 본 연구는 선행 연구 개관을 통해서 부적응적 자기개념(예: 낮은 자기존중감), 부적응적 성격 특성(예: 강한 자기애), 그리고 강한 부정적 정서 경험(예: 높은 수준의 불안)이라는 SNS 중독의 표면적 원인을 파악하였다. 이후 본 연구는 선행 연구 개관을 기반으로 이들 표면적 원인 기저의 근본적 원인으로 인지적 차원의 초기 부적응 도식과 정서적 차원의 정서조절곤란을 도출하고 ‘초기 부적응 도식 → 정서조절곤란 → SNS 중독’이라는 심리적 부적응 기제를 개념적으로 제안하였다. SNS 중독의 고위험군인 20대를 대상으로 설문조사 를 실시한 결과, 20대 여성 집단에서 이와 같은 심리적 부적응 기제가 나타났지만 20대 남성 집단에서는 ‘초기 부적응 도식 → SNS 중독’의 관계만 유의미한 것으로 밝혀졌다. 본 연구 결과는 20대 남녀의 초기 부적응 도식에 대한 인지치료 나 20대 여성의 정서조절곤란에 대한 정서치료가 SNS 중독 치료에 실질적으로 도움이 될 수 있다는 함의를 제공한다.

This study aimed to evaluate the fermentation characteristics of mixed Makgeolli with barley and wheats under, fermentation at different temperatures (20, 25, and 30℃) and time (3, 6, and 9 days). The pH and sugar of mixed Makgeolli were 3.68~4.26 and 12.30~17.31 ∘Brix, respectively. The total acidity showed proportionate increase with fermentation temperature and time; whereas, reducing sugar contents decreased with increasing fermentation temperature and time. The alcohol contents of mixed Makgeolli varied significantly by fermentation temperature and time (p<0.05). In terms of color values, the L value decreased with increasing fermentation temperatures, and a value increased significantly with increasing fermentation time. The number of microorganisms (yeast, total bacteria and lactic acid bacteria) in mixed Makgeolli decreased progressively with increasing fermentation temperature and time. Among the organic acids (citric, lactic, malic, and pyruvic acids) in mixed Makgeolli, citric and lactic acid was present at the highest concentrations. From these results, the optimum fermentation conditions of mixed Makgeolli with barley and wheat were 20~25℃ for 6 days.

The study is the development of stone processing machines for larger blocks of stone for more than 2 meters. The wire saw were replaced by the cutting of existing prototypes and employed as a new form of cutting tools equipped with industrial diamonds. In addition, a turn table was developed to enable the milling of large blocks of stone allowing them to spin. On the other hand, large processing machinery has been imported and used mostly by Chinese machinery and has caused many inconveniences in managing and using equipment. Therefore, it is difficult for domestic production products to remain unstable, thus maintaining the nation`s crumbling granite industry. As a result, it is uncomfortable to find domestic products, but it is difficult to maintain the domestic stone industry. Therefore, we look forward to the revitalization of the domestic stone industry through this development.