• Journal of The Korean Association of Information Education
• /
• v.12 no.1
• /
• pp.109-120
• /
• 2008

The purpose of this study is to develop a test and verifying the validity and reliability for measuring a effectiveness of e-earning course in cyber university. Twenty-five items were developed based on literature review and were examined by experts in the field. For item analysis, EFA(Exploratory Factor Analysis) was performed with 768 students in first study. In order to validate the test, CFA(Confirmatory Factor Analysis) was conducted with 791 students in second study. The result of the study yielded five factors with 25 items: 1) contents and design, 2) instructor, 3) system, 4) evaluation, and 5) overall course satisfaction. And this research reports the reliability and validity of new test.

• The Korean Journal of Mycology
• /
• v.31 no.2
• /
• pp.84-88
• /
• 2003

Basic studies on the cultural characteristics of Pycnoporus coccineus and P. cinnabarinus were performed. They exhibited $30{\sim}40{\circ}C$ optimal temperature ranges and optimal pH ranges of $5{\sim}6$. Among 6 media, they were good at mycelial growths on PDA, LBA and YMA.P. coccineus grew more than P.cinnabarinus on the same medium. Among 10 sawdust media, they were good at mycelial growth on three oak trees and Alnus hirsuta. However, the sawdust of Castanea crenata was bad at mycelial growth. Among 3 coniferous trees, Larix leptolepis showed better growth than the other trees such as Pinus densiflora and P. koraiensis. The fruit body production P. coccineus was about twice better than P. cinnabarinus on Quercus spp. sawdust cultivation.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.33 no.1
• /
• pp.73-79
• /
• 2013

In this study, NIMAX material has been processed using the three-dimensional measuring instrument and white light interferometer. they were tested to roundness and surface roughness and results are as follows: As for a cutting characteristic, it indicated that F4 showed a lower result than 2F showed due to the high hardness of the material and showed a good result when spindle rotation speed and tool feed were low. As for the measurement of roundness through 3-Dimensional measuring machine, it indicated that 4F showed a good result like the condition of cutting component and that roundness showed a good result when spindle rotation speed of 1,700 rpm and tool feed speed of 85 mm/min were applied. As for the surface roughness of processing surface, Surface roughness showed better 4F than 2F and conditions of spindle rotation speed 1,700 rpm, tool feed rate 55 mm/min showed good results in the Ra $0.4025{\mu}m$.

• Proceedings of the KOR-BRONCHOESO Conference
• /
• 2003.09a
• /
• pp.110-110
• /
• 2003

후두기관외상은 두경부 부위의 다른 외상에 비해 흔하지 않은데, 이는 연골의 유연성과 후두의 가동성, 후두가 하악과 흉골사이에 위치하여 외상시 보호 받게 되는 해부학적 특성에 기인한다. 그러나, 후두는 호흡과 발성에 중요한 기관으로 조기 진단과 정확한 평가, 적절한 치료를 못할 경우 생명을 위협 할 수 있고 삶의 질에 지대한 영향을 줄 수 있다. 이에 저자들은 급성 후두기관손상으로 수술적 치료를 받은 환자를 대상으로 손상 기전 및 임상 양상, 손상부위, 손상 정도 치료 등을 알아보고 향후 치료에 도움을 얻고자 하였다. 1996년부터 2003년까지 급성 후두기관 손상으로 수술적 치료를 받은 10명을 대상으로 후향적으로 조사를 하였다. 손상정도는 Schaefer의 분류를 따랐으며 술후 결과는 발성과 기도유지로 평가하였다. 발성의 경우 수상전과 동일하거나 유사할 경우 성공(good)으로, 수상전과는 다르지만 기능을 하는 경우는 양호(fair)로, 거의 음성이 나지 않거나 알아들을 수 없는 경우 불량(poor)로 분류하였고, 기도유지는 수상전과 동일하거나 유사할 경우 성공(good)으로, 경한 흡인이나 운동 유발성 호흡곤란이 있는 경우(fair)로 발관이 되지 않는 경우를 불량(poor)으로 분류하였다. 남녀 성비는 8대 2였고 30～40대가 4명으로 가장 많았다. 손상의 원인은 둔상인 경우(4예) 교통사고가 2례, cloth line 손상 2례, 관통상(6례)는 모두 칼에 의한 좌상이었다 증상은 피하기종이 9례, 애성이 7례, 호흡 곤란이 6례로 많았으며 손상부위는 갑상연골 골절이 5례(50％), 기도손상과 갑상선 손상이 각각 4례에서 관찰되었다. 그 외에도 윤상 연골 골절과 윤상갑상막 손상 등이 관찰되었다. 또한 점막 손상이 7례에서 관찰되었다. 성대마비는 내원시 4례에서 관찰되었다 치료는 수상 후 조기수술을 시행하였고 수상 부위를 개방하여 손상된 연조직을 일차 봉합하거나, 골절을 정복 고정하였고 3례에서 스텐트를 삽입하였다. 술후 기도유지는 모두 성공적이었고 발성기능은 6례에서 성공(good)적이었고 4례에서 양호(fair)의 결과를 보였다. 양호의 결과를 보인 모든 예가 내원시 성대 움직임의 마비나 저하를 보인 예였다. 급성 후두기관손상환자에서 조기 진단과 적절한 수술적 치료는 환자의 생명을 유지시키고 술후 발성 지능의 보존에 양호한 결과를 보였다.

• The Korean Journal of Mycology
• /
• v.26 no.1 s.84
• /
• pp.39-46
• /
• 1998

This study was carried out to obtain the basic data for artificial culture of Sparassis crispa. The optimal conditions for the mycelial growth were $25^{\circ}C$ and pH 4, respectively. The mycelial density of S. crispa was most compact in the Hamada media, whereas colony diameter was prominent in the Hoppkins media. Carbon sources such as maltose, arabinose and mannitol were favorable for stimulating a mycelial growth of S. crispa. Glycine, one of nitrogen sources also appeared to be favorable to the mycelial growth. The optimum C/N ratio was about 20 : 1 in case that 1% glucose as carbon source was mixed with the basal medium. Fumaric acid or lactic acid as organic acid was most favorable to the mycelial growth.

• Korean Journal of Organic Agriculture
• /
• v.16 no.3
• /
• pp.299-308
• /
• 2008

In this study, the effect of commercial organic growth medium amended with different ratios of vermicast on the growth of rice seedlings. The amended ratios of vermicast were 0% (control), 5%, 10%, 20% and 40%, respectively. A bioassay with two rice varieties (Chucheng and Black) was conducted to assesses the amendment effect of vermicast on the seedling growth in two potting methods. In potting treatment, the Chucheng variety with late maturity showed significantly higher values on growth parameters excepted root weight (RW) up to 20% and Black variety with early maturity up to 10% amended with vermicast, respectively. In floor layering treatment, all of the growth parameters significantly increased up to 5% amended with vermicast in both rice variety. The seedling growth of rice in floor layering treatment attained the highest values at lower amended ratios of vermicast than those of potting treated only, it may correspond with increased uptake of nutrient by elongated root grown under the layering amendment of vermicast. Vermicasts can be used as soil amendments or components of plant growth medium for seeding organic agriculture.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.31 no.2
• /
• pp.172-177
• /
• 1995

The maneuverabilities of the M.S. TAMYANG are studied, based on maneuvering indices and the data obtained from her Z test. The results obtained are summarized as follows : 1. The maneuvering indices K'and T'of the M.S. TAMYANG are 0.9464, 0.6895 at 10$^{\circ}$Z test and 0.8651, 0.4224 at 20$^{\circ}$Z test and 0.8349, 0.4328 at 30$^{\circ}$Z test respectively. The above calculated values K', T'showed that her maneuverabilities are more effective when the rudder is used to small angle than to large angle. 2. As her maneuvering indices K'and T'at 10$^{\circ}$Z test are smaller than the standard maneuvering indices of fishing boats, her turning ability was found to be lower but her obeying ability higher. 3. The running distance of a turn at her 10$^{\circ}$Z test was about 8.8 times her own length and she was considered to have good maneuverabilities synthetically.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.19 no.1
• /
• pp.63-70
• /
• 1983

Recently, many studies for developing the underwater welding techniques have been carried out in the advanced countries as a manufacturing process and a repairing method according as a great deal of interest in development for various marine industrial fields has been gradually increased. But no study on such underwater welding is available at present in our country. In this study, underwater welding was carried out for welding of domestic structural steel plates (SM41A) of 10 mm thickness, using six types of domestic coated arc welding electrodes on a self-made gravity type underwater welding device, resulting in investigation for the underwater weldability of the domestic structural steel plates as well as for the underwater welding properties and practicability of the domestic welding electrodes.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2019.04a
• /
• pp.79-79
• /
• 2019

홍띠(Imperata cylindrica 'Rubra') 식물자원의 기내대량증식과 재분화식물체의 순화체계를 구축하고자 기내 재분화에 적합한 식물재료부위, 생장조절물질을 조사하고, 재분화 유식물체로부터 적정 순화조건을 구명하였다. 기본배지로 MS (Murashige and Skoog, 1962) 배지를 사용하였고, 배양은 $26{\times}2^{\circ}C$, $25{\mu}mol/m^2/s$, 14h/10h (day/night) 광조건 하의 배양실에서 수행하였다. 캘러스 형성은 뿌리 끝, 줄기절편, 생장점 부위 중생장점 부위에서 가장 양호하였고, 이 생장점 조직에 0.1 mg/L의 2,4-D와 2 mg/L의 BA를 처리하였을 때 양호하였다. 캘러스 증식은 0.1 mg/L의 2,4-D와 0.05 mg/L의 BA 배지, 0.05 mg/L의 2,4-D와 0.5 mg/L의 BA를 첨가한 배지 중 0.1 mg/L의 2,4-D와 0.05 mg/L의 BA 배지에서 양호하였고, 이들 캘러스로부터 신초 재분화는 0.01 mg/L의 NAA와 2 mg/L의 BA 처리에서 양호하였다. 초기 치상으로부터 실제 경과시간은 캘러스 유도에 19주간(2018. 03. 18~07. 27), 캘러스 증식 9주간(2018. 07. 27~09. 28), 신초 유도 11주간(2018. 09.28~12. 14), 순화에 10주간(2018. 12. 14~2019. 02. 23)에 걸쳐 진행하였으나 확립된 배양계를 적용하면 캘러스 유도 4주, 캘러스 증식 3주, 신초유도 및 증식 ４주, 순화 ７주 정도가 소요될 것으로 계측되었다. 순화는 다경줄기 형성후 MS배지를 멸균한 상토(버미큘라이트) 또는 종이포트로 교체하여 재분화식물체를 배양병에서 7주간 배양하고, 7주후에 배양병 뚜껑을 1/10 정도 1차 개방하여 1주일 후 3/10 정도 개방하여 2주간 경과한 후 컵포트(직경 6 cm)에 이식하여 성공적으로 활착시켰다.

• Journal of Plant Biotechnology
• /
• v.34 no.4
• /
• pp.331-338
• /
• 2007

One-node stem pieces ca. 1 cm in length containing a axillary bud and a fully expanded leaf were obtained from it in vitro plants of potato (Solanum tuberosum L.). Leaves were removed and the nodes were cultured on the MS medium to investigate the effects of temperature, day length, sucrose, and CCC in microtuber formation and development. The fresh weight of microtubers after 80 days increased significantly at 8% sucrose and $20^{\circ}C$ compared with $28^{\circ}C$. The tuberization and development were reduced at $28^{\circ}C$ except short-day treatment of 8 hours at 8% sucrose. The fresh weight and diameter were increased on the culture medium added CCC 500 mg/L. The potato tuberization was promoted under short daylength, and it showed great effect by treatment with the CCC. Though the tuberization was promoted at low temperature of $20^{\circ}C$ in a histologic change of an axillary bud part cell of a potato, the cells were able to observe the swelling growth. Swelling growth of tissue was stimulated in the darkness and was more remarkable by addition of CCC. In particular, in the visual ratio of cell division for each position in the tissue, the cortex part showed larger ratio of cell expansion than that of the pith part. The effect of CCC was identified at 8% sucrose in the darkness. The effect of CCC was not showed in sucrose 3% under long daylength of 16 hours. As a result, the fact of a substance with AGPase important for starch composition was certified by the result with the inclose of AGPase activity on high concentration of sucrose, CCC, and dark treatment by which tuber formation and development are promoted.