• Proceedings of the Plant Resources Society of Korea Conference
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• 2010.10a
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• pp.19-19
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• 2010

황칠나무(Dendropanax morbifera Lev.)는 두릅나무과(Araliaceae)에 속하며 학명에서 뜻하는 바와 같이 목본 (Dendro), 전능약(Panax)이라는 의미가 있고 나무인삼이라 불리기도 하며 줄기에 상처를 내면 노란액이 나온다고 해서 황칠나무(D. morbifera)라는 이름이 붙여졌다. 두릅나무과는 우리나라에서 최고의 약재들로 손꼽히는 인삼(Panax ginseng), 가시오갈피(Eleutherococcus senticosus) 등의 약용식물을 포함하고 있어서 황칠나무는 황칠수지액 이외에 약용식물로서의 무한한 개발 가능성을 내포하고 있다. 따라서 본 실험은 황칠나무의 기내 부정근 유도 및 증식조건의 확립을 목적으로 수행되었다. 우선 황칠나무의 기내 발아체로부터 부위(잎, 줄기, 뿌리)를 달리하여 부정근을 유도한 결과, 잎은 줄기나 뿌리보다 양호한 부정근의 유도를 보였다. 또한 유도된 부정근을 이용하여 옥신의 종류에 따른 부정근 유도율을 조사한 결과 IBA와 NAA는 IAA와 2.4-D보다 높은 유도율을 보였다. IBA의 농도에 따른 유도율과 증식효율은 IBA가 1.0 mg/L 첨가되었을 때 가장 높은 유도 및 증식효율을 보였다. 최적의 액체배지조건을 확인하고자 sucrose의 농도와 염농도를 달리하여 실험한 결과 1/2MS 배지는 MS 배지보다 10%정도 높은 증식율을 보였다. 액체배양 된 황칠나무의 부정근을 각각 1/2MS 배지에 30 g/L sucrose, 3.0 mg/L IBA가 첨가된 5 L volume 생물반응기에 4주 간 배양한 대조구와 2주 후 IBA의 농도를 1.0으로 낮추어 배양한 실험구에서 2주후 IBA의 농도를 낮추어 배양한 실험구에서 대조구보다 약 2배 높은 부정근의 증식량을 보였다. 결국, 황칠나무의 종자발아체를 이용하여 부정근의 유도 및 증식조건에 필요한 기내배양조건을 확립하였고, 플라스크와 생물반응기 배양을 통해 효율적인 실험실 내 증식조건을 확립하였다. 본 실험결과는 향후 황칠나무 천연추출물을 활용한 향장품/식,의약품 소재의 대량확보 차원에서 중요한 가치를 내포하고 있다고 조심스럽게 사료된다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.16 no.1
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• pp.110-119
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• 2012

Fiber reinforced polymer (FRP) reinforcing rebar with non-corrosive property is suggested as an alternative replacement to steel reinforcing rebar due to its enhanced durability and non-corrosive characteristics. Currently, a limited number of glass fiber reinforced polymer rebar (GFRP) are sold commercially due to their high cost, relatively low performances, and brittle failure characteristics. Therefore, the performance enhancements and cost reduction of GFRP rebar are needed to increase its applications in construction fields. The intent of this study is to develop high performance GFRP rebar by improving its tensile and shear properties. Also, in order to reduce manufacturing costs, factors such as material composition and manufacturing process were evaluated to improve manufacturing efficiency. Finally a GFRP rebar with enhanced material properties and less expensive than the GFRP rebar currently sold in the market was manufactured and evaluated for its application possibility in construction fields.

• Journal of the Korea institute for structural maintenance and inspection
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• v.26 no.4
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• pp.81-90
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• 2022

In this study, for one-way concrete slabs, the flexural strength, deflection, and crack width according to the amount of reinforcing bars were compared for the cases of using steel reinforcing bars and CFRP reinforcing bars. Critical performance dominating the flexural design was investigated and how to design the CFRP-reinforced concrete slab with efficiency was also discussed. It was found that CFRP-reinforced concrete slabs could achieve greater design flexural strength with the same amount of reinforcing bars compared to those using steel rebar, while deflection and crack width were relatively much larger. In concrete slabs using CFRP reinforcing bars, it was confirmed that the maximum crack width acts as a dominant factor in the design. For more efficient flexural design, it is necessary to mitigate the allowable crack width to 0.7 mm and to apply smaller diameter reinforcing bars to control the crack width.

• Korean Journal of Plant Resources
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• v.24 no.5
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• pp.514-520
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• 2011

This study describes conditions for the mass production of mutant hairy root lines by co-cultivation with A. rhizogenes harboring the activation tagging vector pHC7. Various sources of explants were subjected to genetic transformation with A. rhizogenes to determine optimum conditions and cultivar for the highest frequency of hairy root formation on explants. Hairy root formation also were investigated in transformed hairy roots grown in various culture media. Finally, a total of approximately 2,500 lines of hairy root mutants were produced in this study. A managing system for metabolomics in hairy root lines also were established. These hairy root lines will be useful to determine functions of genes relating biosynthesis pathway of secondary metabolites.

• Journal of the Korea Society of Computer and Information
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• v.28 no.12
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• pp.175-182
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• 2023

In this paper, we propose a study compared and analyzed the CPR results and muscle fatigue of the three groups. There is a group that counts loudly when compressing the mannequin's chest (Group A), a group that breathes autonomously without counting (Group B), and a group that breathes abdominally without counting (Group C). Twelve people were assigned to each group, and after performing chest compressions for 5 minutes, the results of CPR were analyzed using a program connected to the mannequin, and the muscle fatigue of the performers was analyzed using wireless electromyography. The most efficient method was found to be group B. If we only look at the speed and depth of compression within the normal range, Group C would be more efficient, but Group B showed significantly lower muscle fatigue, and Group A did not reach the normal range in depth of chest compression and muscle fatigue was the highest. Group B was also found to be the most accurate in hand positioning accuracy, and was also found to be the most efficient in maintaining concentration on chest compressions.

• Bulletin of the Korean Institute for Industrial Safety
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• v.3 no.1
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• pp.27-30
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• 2003

지난해 12월 30일자로 산업안전보건법이 개정 공포(법률 제 6847호)됨으로써 단순반복작업 또는 중량물 취급 등으로 인한 근골격계질환의 예방을 위한 법적 근거를 마련하게 되었다. 이에 따라, 해당 사업장에서는 무엇을 어떻게 준비를 해야하는지에 대한 구체적 준비사항을 문의해 오고 있으면 근골격계질환 예방 관련 규칙개정(안)에 대한 관심이 매우 높은 상태이다. 따라서, 본 법의 취지대로 사업장에서 근골격계질환 예방을 효율적으로 수행하기 위해서 우선 사업장안전보건 관계자 및 근로자대표가 관련업무에 관해 무엇을 어떻게 수행해야 하는지를 구체적이고 명확하게 알아야만 책임을 지고 예방업무를 수행해 갈 수 있을 것이다.(중략)

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.371-376
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• 2018

The purpose of this study is to clarify the effects of whole-body vibration and to provide scientific basis for effective exercise by analyzing the differences in lower extremity muscle activation according to squat position during whole body vibration. In this study, muscle activation during whole-body vibration was measured in 10 healthy males in their 20s with no orthopedic conditions during standing posture, deep squat, half squat, and heel raise squat. Muscle activation was compared by measuring the root mean square (RMS) with electromyography electrodes attached to lateral gastrocnemius, tibialis anterior, vastus lateralis, and biceps femoris. The vibration intensity was applied in combinations of the volumes of 50 and 80 and the frequencies of 10, 25, and 40 Hz in each posture. The results showed that there were differences in muscle activations of external gastrocnemius, tibialis anterior, and vastus lateralis among the position(p<.05). The heal raise squat was found to have a high muscle activation effect.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.163-166
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• 2005

[ $TiO_2$ ] 광촉매에 의한 분해 반응의 활성을 높이기 위한 다양한 연구가 진행되었다. 광촉매 반응은 1차 반응을 따랐으며 초기농도가 높을수록 분해효율이 감소하는 경향을 보였다. 본 연구에서는 산화제로 과산화수소가 주입되었을 경우 분해효율을 조사하였으며, 과산화수소를 주입하였을 경우가 그렇지 않은 경우보다 더 높은 분해효율을 보였다. 또한 과산화수소 주입량을 달리했을 때, 주입량이 증가할수록 효율이 높아지다가 일정량 이상에서는 오히려 효율이 감소하는 것으로 나타났다. 따라서 과산화수소 최적첨가량이 존재함을 알 수 있었다. 한편 $TiO_2$에 전이금속을 첨가하여 전이금속이 $TiO_2$ 촉매의 분해효율에 미치는 영향을 알아보았다. Pt(0.5%)-$TiO_2$가 가장 높은 분해효을을 보였으며, Pt첨가함량이 더 큰 Pt(2%)-$TiO_2$는 함량이 증가했음에도 불구하고 큰 차이는 아니지만 오히려 효율이 감소하였다. 따라서 촉매표면에서 전자와 정공이 생성되었을 때, Pt가 전자를 포획함으로써 전자와 정공의 재결합율을 감소시켜 OH라디칼을 생성할 수 있는 정공이 많아져 반응효율을 증가되는 것을 알 수 있었고, 금속에 따른 최적 첨가함량이 존재함을 알 수 있다. 반면에 Pd를 첨가했을 경우는 첨가 함량에 관계없이 모두 분해효율이 오히려 감소하는 경향을 나타냈으며 이는 전이금속 고유의 성질이나, 또는 대상물질에 따라 각기 다른 경향이 존재함을 나타내며 추가적인 연구가 필요하다고 사료된다.

• The Journal of the Korea Contents Association
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• v.9 no.10
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• pp.427-435
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• 2009

The aim of this study was to examine the effect of a brisk walking intervention for 8weeks on isokinetic muscular function factor(strength, power, endurance). The following results were found from the current study: First, Isokinetic muscle function(strength, power, endurance) on $60^{\circ}/sec$ in extension and flexion was significant exercise group and interaction in left knee flexion and right knee extension(P<.00l). Secondly, Isokinetic muscle function(strength, power, endurance) on $120^{\circ}/sec$ in extension and flexion was significant exercise group and interaction in left knee flexion and right knee extension(P<.001). Thirdly, Isokinetic muscle function(strength, power, endurance) on $180^{\circ}/sec$ in extension and flexion was significant exercise group and interaction in left knee flexion and right knee extension(P<.001). Considering the above result of the study the brisk walking had more improvement knee flexor and extensor muscular power. Therefore the brisk walking in the study can be proposed as effective plan to prevention hurt from a sarcopenia and to raise quality in life.

• Nuclear Engineering and Technology
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• v.17 no.4
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• pp.356-360
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• 1985