Numerical analysis for flow and noise characteristics of sirocco fan design factors is conducted in this study. 4 cases of blade angle(α=24°~30°) and 5 cases of RPM(390~1170RPM) are calculated. Flow characteristics are compared for the number of blades. Outlet flow rate is tended to decrease as the number of blades increased. There is little difference in the flow characteristics for the angle of blade. The highest outlet flow rate is predicted at α=24°, and the lowest at α=28°. Flow and noise characteristics are compared for α=24° and 26°. Outlet flow rate is almost similar in both cases, but noise for α=24° is predicted higher at high RPM conditions.

본 연구의 목적은 북한이 2016년 5월 3일 유엔여성차별철폐위원회에 제출한 유엔여성 차별철폐협약 2·3·4차 국가이행보고서를 놓고, 동 보고서의 보건 인프라 조항을 분석·평가 하는 것이다. 이에 따라 본 연구의 주요 분석대상은 북한이 공식적으로 유엔에 제출한 ① 북한의 여성차별철폐협약 2·3·4차 국가이행보고서, ② 유엔여성차별철폐위원회가 추가로 요청한 쟁점, ③ 이에 대한 북한의 추가 답변서, ④ 유엔여성차별철폐위원회의 최종 견해를 표명한 보고서에 나타난 보건 인프라 부문 조항들이다. 또한 본 연구의 연구방법은 문헌조사기법에서 주로 활용하는 질적 연구방법을 분석기제로 사용하고자 한다. 분석결과, 첫째, 북한의 국가 이행보고서상의 보건 인프라의 경우 보고 내용은 일부 정량적인 보고가 있지만 다수가 정성적인 내용 중심의 보고이다. 이는 기존의 보고 행태와 거의 동일한 패턴이다. 둘째, 유엔여성차별철폐위원회의 추가 쟁점은 협약 이행 점검의 필수 사안인 여성 보건 현실에 대한 자료를 요청하였다. 무엇보다 이러한 유엔여성차별철폐위원회의 추가 요청은 본 보고서의 미진한 보고 행태에 기인한다. 셋째, 북한의 추가 쟁점에 대한 답변서의 경우 내용적으로 접근하면 일부 누락된 보고와 추상적 수준의 초점을 벗어난 답변 이 주류를 이루고 있다. 이러한 보고 행태는 북한의 심각한 오류이고 결과적으로 이는 사실 상의 북한 스스로 마지막 소명 기회를 놓친 셈이다. 넷째, 유엔여성차별철폐위원회의 최종 견해의 경우 보건 인프라에 대한 지적과 경고보다는 보건 현실에 대한 문제제기이다. 즉, 유엔여성차별철폐위원회는 심의와 평가에 전제되는 문제를 제기하였는데, 이는 북한이 당면한 해결과제이자 여성 보건의 선결과제이다.

In this study, numerical analysis is conducted to understand the flow characteristics of the radial impeller with the design parameters such as the blade shape and position using the ANSYS Fluent software. The shape of blade is divided into two types, a backward curved blade and an airfoil forward curved blade. To examine the fundamental flow characteristics near the blades, a rectangular flow field is modeled and analyzed. On the other hand, for the impeller rotation analysis, the simulation is performed by modeling the rotational region separately. As a result, the airfoil forward curved blade shows higher outlet flow rate than the backward curved blade. In addition, as the depth of the impeller and the attachment angle of blade increase, the higher flow rate appears.

이 글은 예이츠가 정의하고 있는 문명과 인간의 모습을 고찰하기 위한 것이다. 예이츠는 하나의 문명이 중심은 분명 존재하지만 영구적으로 변함없이 존재하는 것이 아니라 탄생과 성장 및 소멸과정을 경유한다는 주장을 펼치고 있다. 그리고 인간의 삶 역시 항구적일 수 없으므로 예이츠는 인간의 사고를 문제의 핵심으로 설정하면서 실재 추구를 강조하고 있다.

This study conducted a survey on environmental awareness and analyzed outdoor PM10 and heavy metals (cadmium, lead) for 60 local residents living in the Gwangyang national industrial complex from July 2019. 40.0% of subjects responded that local environmental pollution was serious. Especially, there was a high proportion of residents living near the industrial complex or roads where it was perceived that local environmental pollution was serious. The average concentration of PM10 in the outdoors of the houses was 10.95 μg/m3 and the average concentration of heavy metals in PM10 was 1.90 ng/m3 for Cd and 24.92 ng/m3 for Pb. Overall, the average concentration of PM10 and heavy metals revealed a tendency to be high in the houses located near the industrial complex or the roads. As a result of a risk assessment carried out, the cancer risk of Cd was estimated to exceed 106 in the CTE, RME and Monte Carlo analysis. These results suggest that the urgent implementation of specific environmental health education for local residents is necessary.

This study examines the effects of surrounding outdoor environmental characteristics in multi-use public facilities that are used by the susceptible population, on the concentration and distribution of indoor airborne bacteria. For this study, areas were divided into ‘factory area,’ ‘city area,’ and ‘forest area.’ The research was conducted from October 2017 to April 2018, and the selected target facilities were daycare centers, hospitals, postpartum care centers, and nursing homes for the elderly. In order to measure airborne bacteria, indoor air samples were collected using a six-stage viable particulate cascade impactor, and airborne bacteria samples were collected using MCE (Mixed cellulose esters) filters. Moreover, the outdoor airborne bacteria concentration was also measured to determine the concentration ratio (I/O ratio) of the total indoor airborne bacteria and total outdoor airborne bacteria concentrations. The results showed that the total outdoor airborne bacteria concentration was highest in the city area, with 74.2 ± 60.0 CFU/m3, and the lowest in the factory area, with 45.9 ± 35.8 CFU/m3. Furthermore, the distribution of the total outdoor airborne bacteria concentrations significantly differed across each surrounding environment (p < 0.05). On the other hand, no statistically significant difference in total indoor airborne bacteria concentrations, according to surrounding environments, was observed (p > 0.05). These findings suggest that the concentration of outdoor airborne bacteria differs across surrounding environments, unlike that of the indoor airborne bacteria.

This study was performed to investigate the characteristics of VOCs and carbonyl compounds emitted by smallscale master, offset, and screen printing facilities. During the printing process, concentration measurements of indoor samples were made at each on the printer equipment and the indoor center of the facility. In each case, the window or door served as natural ventilation, and concentration measurements of outdoor samples were made at each air exit point. The results showed that in all printing facilities, the levels of VOCs and carbonyl compounds were much higher in printer equipment compared to indoor levels. Comparative examination of VOCs between printer equipment and the indoors of the facility, the main species of master and offset printer equipment were Methyl isocyanide, 2,2,6-Trimethyloctane, 2,2-Dimethyldecane, 3,7-Dimethyldecane, Toluene, Acetonitrile, and 3- Methoxy-3-methylbutanol. The main species of the indoors of master and offset facilities were Toluene, 2,2,6- Trimethyl-octane, Isopropyl alcohol, 3-Methoxy–3- methylbutanol, Nonane, and Acetone. However, in the screen printing facility, the printer and indoor emission compounds were the same such as 2-Methyl-cyclopentanone, Cyclohexanone, Ethylbenzene, and p-Xylene. Among the compounds released to the outside, Toluene and Acetone were the most abundant species of VOCs and carbonyl compounds, respectively.

예이츠와 엘리엇 사이의 관계 규명을 위한 시도는 있었지만 좀처럼 그 해답을 찾지 못하는 것처럼 보인다. 이 글은 이 두 시인 사이의 관계 규명을 위해 기획된 것이다. 그래서 먼저 엘리엇과 예이츠 비교 연구의 의의와 이 두 시인 사이의 첫 만남에서 시작하여 예이츠와 엘리엇 상호 간의 평가와 마지막으로 엘리엇 작품 속 예이츠의 투영 모습을 고찰했다.

The purpose of this study was to determine whether there are differences in the verbal interactions of earth science gifted depending on their communications structures and group status in small group activities. To this end, a small group activity was conducted to measure the density of the earth, and 8 small groups were selected, including 4 coownership type and 4 monopolistics type groups with different communication structures. And then, the framework was developed for analyzing verbal interactions to compare the differences in characteristics between small groups. The results are as follows. First, regardless of the communication structures, there were showing a simple pingpong-type communication structures for all small groups. Second, negative interactions such as ‘restraint’, ‘command’, ‘complaint’, and ‘lack of confidence’ predominantly appeared in all small groups. Third, the students in the status of out-lookers in small groups were mainly verbal interactions, such as instructing the other person, acting against the other person’s actions, and expressing dissatisfaction with the attitudes and abilities of members. Therefore, teachers should guide students to use higher-level verbal interactions in their group activities in small group activities, and engage in students communication to prevent negative interactions from occurring. The teachers also need to check the level of achievement for students in the status of out-lookers in advance and guide them to participate more actively in small group activities. This study is meaningful in that it can be sued to design teaching and learning to improve students’ problem solving and communication skills.

The use of printing inks containing organic solvents by the master, offset and screen printing process implies the release of volatile organic compounds (VOCs) to the work environment. In this study, the volatile content of inks was evaluated by using a thermogravimetric analyzer (TGA), in which the solvent is evaporated. And, to identify the the characterization of VOCs emissions from printing inks, air samples were collected in a thermal extractor (TE) and analyzed by thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS). Weight loss curves suggest that there are two main stages, such as dry fastening and chemical curing. As the result, the first stage of mass loss (below 100oC) was due to VOC evaporation. At this stage, master and offset inks are slightly stable thermally up to 100oC, but screen inks weight loss increases distinctly beyond 25oC. The volatile content is higher in screen inks than in the master and offset inks. The results of the mass-specific TVOC emission rate of the master, offset, and screen inks were 6.3 μg/(g·h), 8.4 μg/(g·h), and 212.2 μg/(g·h), respectively. Then the TVOC emission rate of the screen inks was 25~33 times higher than that of the master and offset inks. The main species were 1-Ethyl-2-pyrrolidinone, 1,2,4-Trimethylbenzene, 1,2,3-Trimethylbenzene, 1,2,4,5-Tetramethylbenzene, 1-Methoxy-2- propanol, Decane, Undecane, and Nonane.

The purpose of this study was to evaluate indoor air pollutants of children’s facilities in libraries. The indoor pollutants, which were managed under the “Indoor Air Quality Control Standards” and “Environmental Safety Standards for Children’s Activity Zones,” were measured within five months. The new environmental pollutants such as phthalates and pesticides were also measured. The pollutant-measuring device was installed in children’s spaces in libraries and children’s libraries of the metropols. The result of investigating indoor pollutants showed that the concentration of fungus and floating bacteria had low distributions due to the use of air purifiers in all libraries. The concentration of HCHO and TVOCs was also measured lower than the environmental standards in well-ventilated libraries. On the other hand, phthalates and pesticides were detected in all libraries. In the case of heavy metals, they were mainly found in the finishing materials of the library walls and floors. As a result, indoor pollutants are managed under court receivership. On the other hand, phthalates and pesticides, which are not regulated by environmental standards should be managed because they were detected in all libraries.

PartI of this paper identified the location and size of the noise sources from the axial flow fans, and partII based on that, identified the magnitude of sound pressure from the case and the blade according to frequency in the range of 2200 Hz to 5000 Hz. The equation of Lighthill was used for calculation. Generally, when measuring noise, the analytical area was extended more than 1m from the outlet of the fan. To eliminate the effects of backflow coming from the rear of the fan, the analytical area was extended a little longer than 1m. From the results of the analysis, high noise occurs in the low frequency area, and the lower noise becomes in the high frequency area. The maximum sound pressure generated in the range of 2000Hz~5000Hz is 65dB at a distance of 1m and 82dB at the outlet of the fan. Noise of the fan mainly occurred around the blade and guide, and the noise decreased as the frequency increased between 2200Hz and 3400Hz, but the noise increased as the frequency increased between 3800Hz and 5000Hz.

본 연구의 목적은 2016년 4월 16일 북한이 유엔여성차별철폐위원회에 제출한 북한의 여성차별철폐협약 2·3·4차 통합 이행보고서의 고용복 지 조항을 분석·평가하는 것이다. 본 연구의 주요 분석대상은 북한이 유엔여성차별철폐위원회에 제출한 ① 북한의 여성차별철폐협약 2·3·4차 통합 국가이행보고서, ② 유엔여성차별철폐위원회가 추가로 요청한 쟁점목록, ③ 이 쟁점목록에 대한 북한의 답변서, ④ 유엔여성차별철폐위 원회의 최종 견해에 나타난 고용복지 부문 내용들이다. 본 연구의 연구 방법은 질적 연구방법을 통해 상기 문헌들을 분석하고자 한다. 분석결 과, 첫째, 법령과 고용지원의 경우 북한은 유엔여성차별철폐위원회의 가장 많은 지적과 다수의 권고를 받았다. 둘째, 고용(율)의 경우 북한은 유엔여성차별철폐위원회로부터 여성근로자의 관리직 진출을 보장할 것 을 귄고받았다. 셋째, 임금과 수당의 경우 북한은 유엔여성차별철폐위 원회로부터 남녀 동일노동과 동일임금 통계 부재, 관련 법률과 정책 검 토, 동일노동, 동일임금 정보와 통계를 정기적으로 공개할 것을 권고받 았다. 넷째, 노동보호의 경우 북한은 유엔여성차별철폐위원회의 추가 답변에서 북한 여성의 강제노역에 대해 문제를 제기하였다. 하지만 유 엔여성차별철폐위원회의 최종 견해에서 여성 근로자의 노동보호에 대한 직접적인 권고가 부재했다. 다섯째, 사회보장의 경우 유엔여성차별 철폐위원회는 북한에게 남녀 동일한 정년 보장, 남녀 동일한 복지급여 지급기간을 보장할 것을 권고하였다. 이는 정년보장의 경우 이미 기 완료된 사안으로, 유엔여성차별철폐위원회가 최종적으로 이를 권고할 사 항이 아니라 판단된다. 여섯째, 양육과 부양의 경우 유엔여성차별철폐 위원회의 직접적인 최종 견해에서는 부재하고 다른 부문인 고정관념 부문에서 이를 지적하였다. 이는 유엔여성차별철폐위원회가 상술한 여 성차별철폐에 대한 법령과 고용지원의 경우와 마찬가지 문제로 북한의 의식과 제도 부문에 상호 교차되는 사안이다.

In this study, numerical analysis was carried out to develop low-noise axial fans, which are often used for ventilation in houses. A commercial program and the turbulence models are used for the analysis of internal fan. Proudman acoustic power model and the Curle surface acoustic power model were used for analysis. As a result, the distribution of flow velocity and pressure around the blade and guide of the fan was high, and low in the center of the fan. Noise from the inner wall of the fan case and the blade surface was the highest at the body and vane connections of the blade, and low at the center of the vane and the center of the body.

본 연구는 국내 특산식물이며 관상소재로 개발이 가능한 산꼬리풀의 효과적인 육묘조건을 구명하기 위해 수행되었다. 육묘는 토양 종류와 비료 농도, 차광정도, 추비 농도, 종자의 광원 전처리 및 채종 시기별로 각 요인을 달리하여 수행하였 다. 연구 결과, 산꼬리풀은 원예상토에서 생육이 우수하였으며, 혼용토에서는 비료 첨가 시 생육이 억제되었다. 차광은 55% 차광조건에서 무차광에 비해 전체적인 생육이 향상되었다. 고농도(1000mg·L-1)의 Hyponex는 육묘 시 생육을 촉진 하였으며, 파종 전 종자에 대한 적색광 조사는 추후 초장과 생체중 향상에 효과적이었다. 채종 시기는 2018년도 종자가 2017년 종자보다 생육이 우수하였다.

이 연구는 예이츠의 재림 과 순례자 를 기독교 경전인 『성경』에 나 타난 내용과 비교한 것이다. 예이츠는 이 두 작품에서 『성경』에 나타난 내용을 다양하게 사용하고 있다. 그들 중에는 지난 2000년 동안 지속된 기독교 세계가 세계령에서 나온 이미지로 대치될 것이며 기독교의 성지로 일컬어지는 베들레헴에 사나운 짐승이 출현하거나 예수의 40일간의 금식 장면을 시적 화자의 기도 모습에 비유하고 있다. 이를 통하여 예이츠는 『성경』의 내용을 인유 형식으로 사용하여 시의 의미를 좀 더 강화시키고 있다.