• Journal of the Korean Wood Science and Technology
• /
• 제20권2호
• /
• pp.43-50
• /
• 1992

This study was carried out to investgate the possiblity of using waste bamboo and bast fiber from paper mulberry for Hwaseonji production. 3 types of Hwaseonji were made in an experimental system, 100% bamboo pulp, bamboo pulp mixed with bast fiber in two different ratios, 70% : 30% and 40% : 60%, respectively. The result were as follows: 1. The chinese ink blots of Hwaseonji made from bamboo pulp only was satisfactory, but its tensile strength showed a low value. In order to improve the tensile strength, we must develope a new beating method with musilige. 2. The burst strength increased as the bast fiber content increased. But it is a special characteristic of Hwaseonji, that an even formation of paper is required. Therefore, only the short bast fiber is needed. 3. The tensile strength was raised by increasing the bast fiber content to 60%, resulting in a more durable Hwaseonji. 4. In even thickness, the higher opacity showed the more bast fiber. So the opacity of product III (bamboo: 40%, bast fiber: 60%) is the highest. 5. The commodity value of hand-made paper should be grade-up after a dedusting process.

• 대한기계학회논문집
• /
• 제16권6호
• /
• pp.1205-1215
• /
• 1992

본 연구에서는 1차원 상변화문제를 확장하여 사각형 주형내에서의 접촉열저항 을 고려한 2차원 상변화문제를 해석하고자 한다.즉 고상/액상 경계면인 상변화면을 추적하기 위하여 온도수식법(temperature formulation method)을 적용시 나타나는 복 잡성을 극복하기 위하여 제시된 엔탈피법을 이용하여 순수물질의 경우 뿐만 아니라 2상영역이 존재하는 합금에서의 온도분포, 상변화면의 이동속도 및 총응고에 소요되는 시간등의 열적특성을 해석하며, 또한 이러한 열적특성에 영향을 미치는 매개변수를 도출하고자 주형의 형상, 주형 외벽에서의 열전달계수, 접촉 열전달계수, 주형의 열전 도계수 및 주물의 초기온도등의 변화에 따른 효과를 고찰한다.

• 간호행정학회지
• /
• 제21권5호
• /
• pp.489-500
• /
• 2015

Purpose: The purpose of this study was to identify the relation between violence experiences and the professional quality of life for hospital nurses. Methods: The participants for this study were 212 nurses in one general and three special hospitals located in the metropolitan area of Seoul, South Korea. Data gathered through October and November 2013 were analyzed using descriptive statistics and $x^2$ test. Results: Nurses experienced verbal violence, physical threats and physical violence more frequently from patients and their families rather than from doctors or peer nurses. Nurse's compassion satisfaction was low when nurses experienced violence from peer nurses. Burnout was high when nurses experienced violence from doctors, peer nurses, patients and their families. Secondary traumatic stress was affected by violence from patients and their families. The professional quality of life of nurses was associated with violence from doctors, peer nurses, patients and their families. Of the nurses, 69.3% answered that formation of a positive organizational culture would be the most effective measure for prevention of violence in hospitals. Conclusion: The formation of positive organizational culture, development of violence intervention policies and education are crucial to improve the professional quality of hospital nurses' life.

• 한국농촌건축학회논문집
• /
• 제12권4호
• /
• pp.53-60
• /
• 2010

This study aims to research the local characteristics of layout and floor plan at Hyangkyo Archiecture in Youngdong districts of Gangwon-do. Hyangkyo which were the institutional places of Chosun Dynasty used for stability and order of the dynasty as well as for the education of people. This thesis studies and analyzes the regularity which appears in the formation of architecture mainly in the aspects of layout, plane formality. Jeon-hak-hoo-myo is the arraying formality in which Myungryundang and Daesungjun are placed on a line of one axis with Myungryundang placed lower in the front and Daesungjun place higher in the back and this formality is applied for a land that slopes. The layout formation of Gangkak space is divided into Jeonjaehudang-type and Jeondanghujae-type. This study analyze arrangement type and plane characteristics about local old time school belonging to the Confucian shrine construction at Youngdong districts in Gangwon-do, there is purpose of research to wish to clear the regional special quality of local old time school belonging to the Confucian shrine construction at Youngdong districts in Gangwon-do.

• 한국자원식물학회지
• /
• 제22권6호
• /
• pp.506-512
• /
• 2009

To study the effect of genotype of donor plants on anther culture, anthers of nine hybrid cultivars (Derby, Special, Bossanova, Minipaprika, Fiesta, Boogie, Phenlene, Kufrah, and Clarity) of sweet pepper (Capsicum annuum L.) were cultured in a petridish containing C medium (Sibi, Dumas De Vaulx medium) supplemented with 0.1 mg/L 2,4-D and 0.1 mg/L kinetin, 3% sucrose and 0.32% Phytagel. The cultures were incubated in the dark at $35^{\circ}C$ for seven days, and then cultured at $25^{\circ}C$ with a photoperiod of 16 hr. daylength for 40 days. Frequency of callus formation and plant regeneration was varied among cultivars. Callus formation was ranged from 6% in Phenlene to 69.8% in Kufrah. The highest percentage of regenerated plantlets was obtained in cv. Phenlene (2.67%) followed by Bossanova (2.41%). Result of ploidy analysis; chromosome number observation and flowcytometry analysis, showed that haploid plants could be developed from all of these hybrid cultivars except cv. Fiesta, where highest percentage of haploid plants were obtained in Minipaprika (40%) followed by cv. Bossanova (36.1%). Haploid plants derived from these hybrid cultivars contained single set of chromosome (12 in numbers), higher stomata density (numbers), and smaller sized stomata as compare to diploid plants. The mean length of stomata was 26.9 ${\mu}m$ in haploid plants and 35.7 ${\mu}m$ in diploids.

• 센서학회지
• /
• 제29권6호
• /
• pp.365-368
• /
• 2020

As a green and abundant source of energy, H2 has attracted the attention of researchers for use in different applications. Nevertheless, it is highly flammable, and because of its significantly small size, extreme attention is needed to detect its leakage. In this review, we discuss different effects of noble metals on the H2 gas response and performance of metal oxide-based gas sensors. In this regard, we discuss the effects of noble metals, in combination with metal oxides, on H2 gas detection. The catalytic activity towards H2 gas and the formation of heterojunctions with metal oxides are the main contributions of noble metals to the sensing improvement of H2 gas sensors. Furthermore, in the special case of Pd and somewhat Pt, the formation of PdHx and PtHx also affects the H2 sensing performance. This review paper provides useful information for researchers working in the field of H2 gas detection.

• Journal of the Korean Physical Society
• /
• 제73권10호
• /
• pp.1473-1478
• /
• 2018

In this study, we have developed a simple and cost-effective method to prevent edge bead formation by covering the edge of a chip-level substrate with heat-resistant tape during patterning using SU-8. Edge beads are a fundamental problem in photoresists and are particularly notable in high-viscosity fluids and thick coatings. Edge beads can give rise to an air gap between the substrate and the patterning mask during UV exposure, which results in non-uniform patterns. Furthermore, the sample may break since the edge bead is in contact with the mask. In particular, the SU-8 coating thickness of the chip-level substrates used in MEMS or BioMEMS may not be properly controlled because of the presence of edge beads. The proposed method to solve the edge bead problem can be easily and economically utilized without the need for a special device or chemicals. This method is simple and prevents edge bead formation on the sample substrate. Despite the small loss in the taping area, the uniformity of the SU-8 coating is improved from 50.9% to 5.6%.

• Steel and Composite Structures
• /
• 제42권2호
• /
• pp.161-172
• /
• 2022

In this paper, four specimens of CFST column joints with endplates and long bolts are tested in the scenario of progressive collapse. Flush endplate and extended endplate are both adopted in this study. The experimental results show that increasing the thickness of the endplate could improve the behavior of the joint, but delay the mobilization of catenary action. The thickness of the endplate should not be relatively thick in comparison to the diameter of the bolts, otherwise catenary action would not be mobilized or work effectively. Effective bending deformation of the endplate could help the formation and development of catenary action in the joints. The performance of flexural action in the joint would affect the formation of catenary action in the joint. Extra middle-row bolts set at the endplates and structural components set below the bottom beam flange should be used to enhance the robustness of joints. A special weld access hole between beam and endplate should be adopted to mitigate the chain damage potential of welds. It is suggested that the structural components of joints should be independent of each other to enhance the robustness of joints. Based on the component method, a formula calculating the stiffness coefficient of preloaded long bolts was proposed whose results matched well with the experimental results.

• 한국균학회지
• /
• 제49권1호
• /
• pp.57-66
• /
• 2021

국립산림과학원이 개발한 표고 품종 6개를 대상으로 사각블럭배지에 적합한 품종을 선발하고자 하였다. 100일째 중량감소율은 평균 14.4% (12.8%~15.7%) 였다. 발생작업 후 5~7일에 발이조사 결과 배지당 2~36개였고, 만추향>산산향>산백향>밤빛향>산장향>태향고 순이었다. 대길이는 41~59 mm였고 태향고>산백향>밤빛향>만추향>산장향>산산향 순으로 길었다. 대길이가 짧고 대두께가 굵은 품종은 산산향이 우수하였다. 개체당 중량은 33~77 g였고 태향고>밤빛향>산산향>만추향>산장향>산백향 순이었다. 2 kg 배지의 생산량은 산백향이 가장 많은 582 g이었고 밤빛향>만추향>태향고>산산향>산장향 순이었다. 버섯 갓의 경도는 1,218~1,839 g/10 mm였고 태향고가 1,839 g/10 mm로 가장 단단하였고 밤빛향이 가장 낮았다. 결론적으로 사각블럭배지 재배조건에서 버섯 생산량은 산백향과 밤빛향이 좋았고, 버섯 형태면에서 산산향이 우수하였다.

• 한국주거학회논문집
• /
• 제18권3호
• /
• pp.9-18
• /
• 2007

The purpose of this study was to provide the basic information about the formation background of urban squatter and their housing state in Korea. This study was progressed on the basis of socio-historical point of view from the opening of a port to the after the Korean War. In that sense, this study considered meaning of housing for urban squatter in the Korean housing history. For this study, the formation background of the urban squatter was divided into three periods. The first period was after the opening of a port (1876-1910) when the inflow of Japanese and their plundering from Korea started. The second was Japanese occupation period (1910-1945) which contributed to increase the number of Tomak (mud hut) and made the Tomak-min's village. The third period was Korean war & postwar years (1945-1953). This period was divided into three parts again; after the Korean independence (1945-1950), during the Korean War (1950-1953), and after the Korean War (1953-). The urban squatter was settled in the national land and the public land in each period and experienced the severe housing shortage. The government of the time could not protect the urban squatter from the special national states such as the Japanese rule and the Korean War.