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혼합 상토가 딸기의 뿌리 발달 및 초기생육에 미치는 영향
강호종,채윤석 진주산업대학교 산업과학기술연구소 2005 산업과학기술연구소보 Vol.- No.12
일반적으로 고설재배 농가에서 사용하고 있는 상토를 대상으로 저렴하고 구입용이한 생육에 큰 문제가 없는 몇 가지의 상토를 다른 조합으로하여 딸기의 초기 생육에 미치는 영향을 구명하기 위해 본 시험을 수행한 결과는 다음과 같다. 초장은 팽연왕겨 100%, 오스모코트5g+마가모3g인 시험구에서 17.5cm로 가장 크게 조사되었으며, 통왕겨 33%+재사용상토 66%, 오스모코트 5g+마가모 3g시용 구에서 12.6cm로 가장 작았고 그 외의 시험구에서는 비슷한 결과를 보였다. 크라운의 크기에서는 팽연왕겨를 단용으로 사용한 시험구와 삼록피트와 팽연혼합 시험구에서 다소 굵게 나타났으며 그 외의 시험구에서는 비슷한 결과를 보였다. 엽장과 엽폭은 큰차이가 없었으며 엽면적은 삼록피트와 팽연왕겨를 절반씩 혼합하여 사용한 시험구에서 가장 크게 조사되었고, 통왕겨 33%와 재사용상토 66%를 사용한 시험구와 삼록피트 50%와 통왕겨 50%를 사용한 시험구에서 작게 조사되었으며 그 외의 시험구에서는 거의 비슷한 경향을 보였다. 전체 뿌리중량은 삼록피트와 팽연왕겨(3:7)시험 구에서 가장 높게 나타났으며 통왕겨 33%와 재사용상토 66%를 사용한 시험구에서 가장 낮게 나타났다. 그 외의 시험구에서는 비슷한 양상을 보였다. 본 시험의 종합결과는 크라운 크기와 엽면적에서 고설재배 상토로는 피트모스와 팽연왕겨 혼합함이 본 시험 결과 좋은 결과를 나타내었으나 추후 상토재료의 숙성에 따른 면밀한 연구가 필요하다. A pot experiment was performed to determine the effects on the root growth and early development of strawberry from different combinations of mixed bed soil that is used in general high bed culture farm. The bed soil was obtained from sources inexpensive, easy to obtain, and thought to have no major adverse influence on the growth and development. The length of stalk was longest, 17.5cm, in the test group of 100% paengyeon bran (bulked rice hulls) supplemented with 5g of osmocort and 3g of magamo and smallest in the test group of 33% a whole bran (coarse chaff) and 66% of recycled bed soil mixture supplemented with 5g of osmocort and 3g of magamo. Similar results were obtained in all other test groups. The size of crown was slightly thick in both the test group with paengyeon bran only and the group with mixed combination of samrokpeet and paengyeon bran. All other test groups showed similar results. There were no significant differences in the length and width of leaf among different groups. The leaf area was found to be the largest in the test group treated with mixture of samrokpeet and pangyeon bran in 50:50 ratio, but to be small in the group of 33% a whole bran (coarse chaff) and 66% of recycled bed soil mixture. All other test groups showed similar results Total root weight was highest in the test group of samrokpeet and paengyeon bran in 3:7 ratio mix, and lowest in the group of 33% a whole bran(coarse chaff) and 66% of recycled bed soil mixture. All other test groups had similar results. In all, it is considered that mixture of peetmos and paengyeon bran is desirable to be used as bed soil in high bed culture with regards to crown size and leaf area. However, further detailed experiments need to be performed to determine the advantage of using the preferred mixture and apply the data in the field.
소구경 미세홈 고속가공시 가공환경변화에 따른 가공성 평가
정연행,이채문,강명창,이득우,김정석 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
High speed machining is one of most effective technologies to improve productivity. It can give great advantage for manufacture of die and Moulds. However, when the high speed machining of materials, especially in machining of micro groove, a severely thermal demage was generated on workpiece and tool. Generally, the cutting fluid is used to improve penetration, lubrication, and cooling effect. In order to rise the performance of lubrication, it contains extreme pressure agents (CI, S, P). But the environment of work room go bad by those additive. Therefore, the compressed chilly air with Oil mist system was developed to replace the conventional cutting fluid system. This paper carried out the tests to evaluate the machinability by the cutting environment in high speed micro groove machining of NAK80 (HRC40). Compressed chilly air with oil mist was ejected on the contact area between cutting edge and workpiece. The effectiveness of this developed compressed chilly air with oil mist system was evaluated in terms of tool life. The results showed that the tool life of carbide tool coated TiAIN with compressed chilly air mist cooling was much longer than with dry and flood coolant when cutting the material.
Chea-Yun Kang,Kyong-Nam Kim,Seung-Hwan Lee 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.3
The conventional method for fabricating lithium-ion battery (LIB) electrodes heavily relies on the wet coating process,which involves the use of the environmentally harmful and toxic solvent N-methyl-2-pyrrolidone (NMP). Apart from beingunsustainable, this costly organic solvent significantly inflates the production expenses of batteries due to the need for dryingand recycling throughout the manufacturing process. In this report, we introduce a commercially viable and environmentallysustainable dry process technique. This method utilizes a (polytetrafluoroethylene)PTFE as a dry powder. We successfullysynthesize LiNi0.6Co0.2Mn0.2O2 and graphite electrodes by dry-processing using the fiberization of polytetrafluoroethylene. Theproduced electrodes exhibit a porous structure, and uniform dispersion of polytetrafluoroethylene was confirmed through F. The structural/electrochemical stability is observed at the driving voltage of the electrodes. The initial charge-discharge andcyclic voltammetry are measured and analyzed to evaluate the electrochemical performances. As a result, we could concludethat the synthesized electrodes could be sufficiently applicable to next-generation energy storage devices.
The influence of Ca doping on the capacity fading of LiNi0.8Co0.1Mn0.1O2 cathode material
Chea-Yun Kang,Seung-Hwan LeeD 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.2
Ni-rich layered material can be regarded as an one of the promising cathode for high-energy lithium ion batteries. In thispaper, Ca-doped Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material is prepared to investigate the effect of Ca doping on thestructural properties and electrochemical performances. In structural properties, there is no obvious difference between thetwo samples in terms of crystallinity or morphology. In electrochemical performances, the initial capacity and electrochemicalbehavior are almost identical, while the degree of capacity deterioration in long-term cycle performance is obviously different. This is because Ca doping can increase the bond dissociation energy and pathways for electrons and lithium ions.
Chea-Yun Kang,Seokhoon Oh,Tae Yeon Shim,Seung-Hwan Lee 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.4
Ni-rich ternary oxide cathode (LiNi0.8Co0.1Mn0.1O2, NCM) is highly promising candidate for lithium-ion batteries (LIBs)due to its relatively large specific capacity and high energy density. Nevertheless, intrinsic structural/chemical instability andunwanted side reactions on the surface during charge/discharge, leading to rapid capacity fading and inferior cycle performance,severely impeded its commercialization. Herein, we demonstrated an interfacial/surface dual modification strategy,one of the most important techniques for fabricating LiNi0.8Co0.1Mn0.1O2,NCM cathode materials via Li2SnO3surfacecoating and Sn4+gradient doping. The electrochemical results deliver that the Sn dual-modified NCM exhibits the highestdischarge capacity of 86.5% at 6.0 C and superior initial discharge capacity of 177.8 mAh g−1. In addition, Sn-modifiedNCM811 cathode shows an improved reversible capacity of 144.9 mAh g−1 and excellent electrode kinetics after 200 cycles. The dual modification strategy proposes a novel approach that can accelerate commercialization by simultaneously alleviatingthe surface instability and bulk structural degradation of Ni-rich cathode materials for state-of-the-art LIBs.
Yun-Beom Sim,Soo-Hyun Park,Yu-Jung Kang,Sung-Su Kim,Chea-Ha Kim,Su-Jin Kim,Jun-Sub Jung,Ohk-Hyun Ryu,Moon-Gi Choi,Seong-Soo Choi,Hong-Won Suh 대한생리학회-대한약리학회 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.2
In the present study, the effect of intrathecal (i.t.) or intracerebroventricular (i.c.v.) administration with cholera toxin (CTX) on the blood glucose level was examined in ICR mice. The i.t. treatment with CTX alone for 24 h dose-dependently increased the blood glucose level. However, i.c.v. treatment with CTX for 24 h did not affect the blood glucose level. When mice were orally fed with D-glucose (2 g/kg), the blood glucose level reached to a maximum level at 30 min and almost returned to the control level at 120 min after D-glucose feeding. I.c.v. pretreatment with CTX increased the blood glucose level in a potentiative manner, whereas i.t. pretreatment with CTX increased the blood glucose level in an additive manner in a D-glucose fed group. In addition, the blood glucose level was increased in formalin-induced pain animal model. I.c.v. pretreatment with CTX enhanced the blood glucose level in a potentiative manner in formalin-induced pain animal model. On the other hand, i.t. pretreatment with CTX increased the blood glucose level in an additive manner in formalin-induced pain animal model. Our results suggest that CTX administered supraspinally or spinally differentially modulates the regulation of the blood glucose level in D-glucose fed model as well as in formalin-induced pain model.
Yun-Beom Sim,Soo-Hyun Park,Yu-Jung Kang,Sung-Su Kim,Chea-Ha Kim,Su-Jin Kim,Su-Min Lim,Jun-Sub Jung,Ohk-Hyun Ryu,Moon-Gi Choi,Hong-Won Suh 대한생리학회-대한약리학회 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.6
We have recently demonstrated that some anti-diabetic drugs such as biguanide and thizolidi-nediones administered centrally modulate the blood glucose level, suggesting that orally administered anti-diabetic drugs may modulate the blood glucose level by acting on central nervous system. The present study was designed to explore the possible action of another class of anti-diabetic drugs, glinidies, administered centrally on the blood glucose level in ICR mice. Mice were administered intracerebroventricularly (i.c.v.) or intrathecally (i.t.) with 5 to 30 μg of repaglinide or nateglinide in D-glucose-fed and streptozotocin (STZ)-treated models. We found that i.c.v. or i.t. injection with repaglinide dose-dependently attenuated the blood glucose level in D-glucose-fed model, whereas i.c.v. or i.t. injection with nateglinide showed no modulatory action on the blood glucose level in D-glucose-fed model. Furthermore, the effect of repaglinide administered i.c.v. or i.t. on the blood glucose level in STZ-treated model was studied. We found that repaglinide administered i.c.v. slightly enhanced the blood glucose level in STZ-treated model. On the other hand, i.t. injection with repaglinide attenuated the blood glucose level in STZ-treated model. The plasma insulin level was enhanced by repaglinide in D-glucose-fed model, but repaglinide did not affect the plasma insulin level in STZ-treated model. In addition, nateglinide did not alter the plasma insulin level in both D-glucose-fed and STZ-treated models. These results suggest that the anti-diabetic action of repaglinide appears to be, at least, mediated via the brain and the spinal cord as revealed in both D-glucose fed and STZ-treated models.