• 한국환경복원기술학회지
• /
• 제8권1호
• /
• pp.52-62
• /
• 2005

The objectives of this research is searching for the improvement scheme of spacial use of the Nature Environmental Conservation and its Utilization Facility through the analysis of those existing facilities from the structural and operational view points. In this study, firstly, analysis is commencing with the distinction of lawful and operational concepts of Nature Environmental Conservation and its Utilization Facility. In law, the concept is defined as an individual facility, while practical use of the concept has been understood as a collective space itself. Secondly, frequency tables in regard to the duration of the construction, types of location and objectives, and facility numbers are prepared on the basis of 53 cases of completed and under construction facilities. Conclusively, through the comparisons of facilities of Korea, United Kingdom and Germany, the future considerations on the improvement of the facilities in light of structural and operational aspects has been recommended. In structural view, ecological conservation aspect should be considered from the planning stage of the facility. And at the operational stage, various considerations should be given to the employment of facility experts and development of educational programs respectively.

• 가족자원경영과 정책
• /
• 제13권1호
• /
• pp.1-21
• /
• 2009

The purposes of this study are to provide background information to develop a family-friendly work policy and to increase the effectiveness and feasibility of this policy. We surveyed the performance of family-friendly work policies, and workers‘ needs and utilizations of 17 family-friendly work policies. We also examined the factors that influence the utilization of family-friendly work policies. The study sample consists of 197 working mothers who have at least one child under age 10. The major findings are as follows: 1) The most-needed family-friendly work policy among working mothers is child care leave 2) Of those family-friendly work policies that are not currently provided, the most-needed policy is family care leave 3) The size of firms, the provision of substitutes, and 40-hour work schedules are statistically significant variables that influence the provision of necessary family-friendly work policies and 4) In addition, the work place culture is a very important factor related to the utilization of work- and family-friendly policies.

• Journal of Power Electronics
• /
• 제14권3호
• /
• pp.531-540
• /
• 2014

A novel carrier-based PWM (CBPWM) strategy of a three-level NPC converter is proposed in this paper. The novel strategy can eliminate the low-frequency neutral point (NP) voltage oscillation under the entire modulation index and full power factor. The basic principle of the novel strategy is introduced. The internal modulation wave relationship between the novel CBPWM strategy and traditional SPWM strategy is also studied. All 64 modulation wave solutions of the CBPWM strategy are derived. Furthermore, the proposed CBPWM strategy is compared with traditional SPWM strategy regarding the output phase voltage THD characteristics, DC voltage utilization ratio, and device switching losses. Comparison results show that the proposed strategy does not cause NP voltage oscillation. As a result, no low-frequency harmonics occur on output line-to-line voltage and phase current. The novel strategy also has higher DC voltage utilization ratio (15.47% higher than that of SPWM strategy), whereas it causes larger device switching losses (4/3 times of SPWM strategy). The effectiveness of the proposed modulation strategy is verified by simulation and experiment results.

• 디자인학연구
• /
• 제17권1호
• /
• pp.221-230
• /
• 2004

변화와 경쟁을 전제로 한 지식기반사회, 정보화사회에서는 창의성을 중요시하고 있다. 이러한 현상은 사회 전반에서 나타나고 있으며, 디자인 분야는 그 어느 때보다 창의적인 디자인 개발을 요구받고 있다. 디자이너가 창의적인 아이디어를 발상하고 그것을 더욱 더 창의적으로 발전시키는 데 도움을 줄 수 있는 디자인 사고기법에 관심을 두어야 하는 까닭도 여기에 있다. 이러한 배경에서 본 연구는 창의적인 시각디자인 개발을 위하여 아이디어를 발상하고 발전시키는 데 유용한 사고기법 중의 하나인 스캠퍼의 활용에 관하여 연구하였다. 2차에 걸친 설문조사를 바탕으로 시각디자인 과정에서 창의적 사고기법들과 스캠퍼의 활용 현황을 조사하여 그 결과를 바탕으로 스캠퍼의 활용 가능성을 살펴보았다. 연구 결과로 시각디자인 과정에서 스캠퍼를 효과적으로 활용할 수 있도록 아이디어 발상 및 발전 단계들에 맞추어 스캠퍼의 사고기술들을 분류하고 체계화하여 제시하였다.

• 한국항공우주학회지
• /
• 제39권2호
• /
• pp.195-200
• /
• 2011

소형 지구관측위성의 궤도 보정을 위한 저전력 홀 추력기를 개발하였다. 원통형 홀 추력기의 성능 특성을 파악하기 위해 원통형 홀 추력기과 고리형 홀 추력기를 제작하여 시험을 수행했고 그 결과를 비교 분석하였다. 원통형 추력기는 채널 내경에 따른 성능 변화를 보기 위해 28 mm, 50 mm 두 종류로 제작되었다. 다양한 방전 조건에서 추력과 이온 에너지, 이온 전류를 측정하였다. 결과는 원통형 추력기가 고리형 추력기에 비해 연료 효율과 전압 효율에서 더 뛰어나고, 전류 효율에서는 떨어짐을 보였다.

• Nuclear Engineering and Technology
• /
• 제53권5호
• /
• pp.1479-1482
• /
• 2021

Research reactors are typically well-suited for outreach activities at different levels. However, unplanned seeking to increase the utilization of a research reactor may result in weakening the nuclear security of this facility. Research reactor staff might be in shortage of a functional nuclear security culture; specifically, there might be a conviction that the necessities of research can be given the priority over consistence with security procedural requirements. Research reactors are usually parts of bigger institutes or research labs of different activities. Moreover, the employments of research reactors are usually with the purpose that easy entry to the reactor premises is fundamental. So, they could be co-situated in places with different sorts of activities, mostly under similar security arrangements. The co-area of research reactor offices among different kinds of research labs introduces explicit security issues, the effects of which should be viewed as when building up a nuclear security framework. Notwithstanding potential security vulnerabilities presented in the design, research reactors frequently have devices kept promptly accessible to encourage research and education. The accessibility of these sorts of hardware could be used by an authorized person to commit an unapproved activity or cause harm. This paper aims to present insights to compromise contradicting conditions in new research reactors in which both enhancing utilization and ensuring security are satisfied.

• 한국초전도ㆍ저온공학회논문지
• /
• 제23권3호
• /
• pp.5-9
• /
• 2021

Comprehensive utilization of sulfur-containing iron tailings (SIT) not only solves environmental problems but also creates certain economic value. The iron element from SIT was enriched by the superconducting high gradient magnetic separation (S-HGMS) technology in this study. In the experiments, the total iron content (TFe) was increased from 26.3% to 60.5% with the total sulfur content (TS) of 5.9% under the optimal parameters, i.e., a magnetic flux density of 0.4 T, a slurry flow rate of 1500 mL/min. The high-quality sulfur-containing material with TFe of more than 60% was obtained, which can be used for preparing high-sulfur free cutting steel. The S-HGMS technology can realize the resource utilization of iron tailings with high added value.

• 무역학회지
• /
• 제42권6호
• /
• pp.87-110
• /
• 2017

이 글은 FTA 활용이 우리 농산업화에 갖는 의미를 살피고, 농업분야 FTA 활용 확대를 위한 정책적 시사점을 찾는 것을 목적으로 한다. 이 연구는 농산업화의 핵심인 농기업과 지역농가 간의 계약생산의 실 사례를 살피는 사례연구로서 학문적으로는 FTA 활용에 대한 논의를 농산업화 연구까지 확장하는 의의가 있고, 실천적으로는 우리 농업분야 과제에 대한 근본적인 해법을 제시하고 FTA 활용 확대를 위한 정책적 시사점을 찾는 의의가 있다. 연구결과를 통해 FTA로 인해 유발된 경쟁 속에서 농산업화가 진전을 이루기 위해 농기업과 농가 간 평등하고 공정한 관계 형성을 위한 정부의 지속적인 조정과 지원이 필수적임을 강조한다.

• Child Health Nursing Research
• /
• 제30권3호
• /
• pp.199-209
• /
• 2024

Purpose: This study aimed to assess the knowledge level of first-time mothers regarding digestive health issues in infancy and to examine the utilization of healthcare facilities for such problems. Methods: Data from 119 first-time mothers of infants under 6 months of age were analyzed. Descriptive statistics, t-test, and one-way analysis of variance (ANO-VA) were conducted using the SPSS software. Results: The average correct response rate for first-time mothers' knowledge of digestive health problems in infancy was 61.9%. The highest correct response rate was observed for infantile colic, while diarrhea had the lowest. Less than 50% of mothers received education on infant digestive health problems across all categories. Among digestive health problems in infancy, diarrhea exhibited the highest rate of healthcare utilization, whereas infantile colic had the lowest. First-time mothers' knowledge of digestive health problems in infancy varied based on maternal age (t=-3.66, p<.001), education level (t=-2.26, p=.026), and planned pregnancy (t=3.24, p=.002). Moreover, mothers who received education on infant digestive health problems demonstrated better overall knowledge of digestive health problems. Conclusion: The rate of education regarding digestive health problems during infancy among first-time mothers was < 50%. Furthermore, mothers educated on infant digestive health issues exhibited improved knowledge. Therefore, it is necessary to provide appropriate pre-education to primiparous common gastrointestinal health issues in infants.

• Fisheries and Aquatic Sciences
• /
• 제27권9호
• /
• pp.588-599
• /
• 2024

Tank color is an important environmental factor influencing aquaculture performance, but it remains poorly understood for juvenile giant trevally (Caranx ignobilis) under laboratory conditions. This study evaluated the effects of five different tank colors (white, blue, red, yellow, and dark grey) on growth performance, survival, feed utilization efficiency, body coloration, and biochemical composition of juvenile giant trevally. In a 28-day experiment, juvenile giant trevally with an initial mean length of 1.91 ± 0.03 cm and an initial weight of 0.24 ± 0.04 g were reared in tanks with different colors at a density of 1 fish/L, and each treatment was replicated three times. Results showed that fish reared in yellow tanks had higher growth rate, higher survival, and lower feed conversion ratio compared to those reared in white and blue tanks (p < 0.05). Fish reared in yellow and red tanks had significantly darker yellow body coloration and accumulated more carotenoids than those reared in white and dark grey tanks. Additionally, fish reared in yellow and red tanks had higher body protein content, whereas fish reared in white tanks had higher body moisture content (p < 0.05). These findings indicate that tank color could be an important factor in improving the rearing performance and skin pigmentation of juvenile giant trevally. Yellow tank color is suggested as a potential strategy to optimize juvenile giant trevally seed production in aquaculture.