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마죠람과 오레가노의 생육 및 장유함량에 미치는 양액농도의 효과
강호민,나철욱,박권우,Kang, Ho-Min,Na, Cheol-Wook,Park, Kuen-Woo 한국생물환경조절학회 2003 생물환경조절학회지 Vol.12 No.4
This study was carried out to investigate a adequate strength of nuttient solution in production of marjoram and oregano by hydroponicsl Two herbs were grown for 40days with the strength of 0.5, 1.0, 2.0, and 3.0 dS${\cdot}m^{-1}$ in herb's nutrient solution developed by European Vegetable R & D Center, Belgium. the growth, vitamin C, and essential oil content of marjormam were higher in the treatment of 0.5 dS${\cdot}m^{-1}$ than the other treatments tested. But marjoram growtn with the sstrength of 20. and 3.0 dS${\cdot}m^{-1}$ had the highest mineral contents and essential oil content, respectively. Elevated strength of nutirent solution decreased chlorophyll content. In oregano, the growth was vest in the stength of 0.5, but withered in the strength of 3.0 The chlorophyll content was the lowest in the strength of 0.2dS${\cdot}m^{-1}$, while vitamin C contents had no statistical differences among treatments, Oregano grown with 1.0 dS${\cdot}m^{-1}$had the highest mineral and essential oil content, but the oil yield washighest in the treatment of 0.5 dS ${\cdot}m^{-1}$. In conclusion, the strength of 0.5 dS${\cdot}m^{-1}$ herb's nutrient solution was adequated in production of marjorma and oregano in hydroponicc system. 본 실험은 수경재배시 마죠람과 오레가노의 알맞은 배양액 농도를 구명하기 위하여 실시했다. 배양액은 유럽채소연구센터 허브액을 사용했다. 처리농도는 0.5, 1.0, 2.0, 3.0배액 등 4수준이었고 재배기간은 40일이었다. 마죠람은 지상부 생육, 지하부 생육, 비타민 C,총 정유생산량은 0.5배액에서 가정 조았다. 그러나 무기물함량은 20.배액에서, 정유함량은 3배액에서 좋았으며 엽록소 함량은 고농도에서 감소하였다. 오래가노의 생육 0.5배야ㅐㄱ에서 조았으며, 3.0배액에서는 고사하였다. 엽록소 함량은 2.0배액에서 낮았으나 비타민 C는 이온농도에 영향을 받지 않았다. 무기물과 정유함량은 1.0배액에서 높았으나, 정유생산량은 0.5배액에서 높았다. 이사의 결과로 볼 때 마죠람과 오레가노 수경재배시 적절한 배양액 농도는 허브 배야액 0.5배인 것으로 생각된다.
일측성 만성 이명 환자에서 1회 경두개 자기장 치료의 단기 효과
강호민,박문서,이호윤,이선규,변재용,여승근 대한이비인후과학회 2012 대한이비인후과학회지 두경부외과학 Vol.55 No.4
Background and Objectives The repetitive Transcranial Magnetic Stimulation (rTMS) is generally performed over the course of several weeks, as its theoretical and experimental validity has been identified in repetitive procedures. If short term application of rTMS is proven to be significantly effective, more effective treatment of tinnitus can be expected. This study was conducted to measure the effect of one session of sham rTMS & one real trial of rTMS in chronic unilateral tinnitus patients. Subjects and Method rTMS stimulation of 1 Hz and 100% magnitude was given 1200 times per day to 33 patients with chronic unilateral tinnitus on their left side, between T3 and C3/T5, following the convention of the 10-20 International EEG system. Visual Analogue Scale (VAS) and Tinnitus Handicap Inventory (THI) scores were measured four times-immediately before rTMS, immediately after sham rTMS, immediately after real rTMS and two weeks after real rTMS. Results VAS and THI scores were found to show a tendency of declining. Immediately after real rTMS application, a significant decrease in VAS and THI scores was observed compared to those measured immediately before rTMS (p<0.05). The longer the duration was, the smaller the changes in THI and VAS scores were after a single session of rTMS treatment, a finding that is statistically significant (p<0.05). No significant changes in THI and VAS scores (p>0.05) attributable to the direction of tinnitus were observed. Conclusion A single session rTMS is thought to be a possible adjunctive treatment for tem-porary relief of tinnitus.
複合組織鋼의 母相粒徑과 軸斷面形狀이 破壞擧動에 미치는 影響
吳世旭,姜鎬珉 東亞大學校 1985 東亞論叢 Vol.22 No.1
The weight reduction and reliability, stability of various steel materials used in industrial machinery have become a great importance as industry developes. For this reason a study on dual phase steel has been performed by the reporter with great interest. It was pointed out that fatigue fracture behaviours of MEF dual phase steel were dependent upon a unit of ferrite grain size when the plastic constraint effect and the internal stress were constant. However, when the plastic constraint effect and the internal stress were constant, fracture behaviours of MEF dual phase steel might be expected to depend upon the ferrite grain size and the shape of section. Specimens were prepared the combined microstructures having different size of ferrite grain which has approximatly the constant plastic constraint effect and the constant internal stress through careful heat treatments. Each of tensile specimens and fatigue specimens was conducted by universal testing machine and rotary bending fatigue test machine. They were prepared to be able to apply the stress intensity factor equations(K₁=σ? πℓ. F(?): solid shaft, K₁=k₁.k₂σ? πℓ:hollow shaft). The relationship between fatigue crack length, fatigue crack propagation velocity, stress intensity factor and scanning electron microscope investigation of tensile fracture surface and fatigue fracture surface was investigated during the test. The results of the experiment are as follows. 1. Fracture behaviours of MEF dual phase steel with the constant plastic constraint effect and the constant internal stress depend on great and small size of ferrite grain. It has been found that Hall-petch equation is applied dual phase-poly crystallization. 2. The crack propagation length and number of cycles of hollow specimen and solid specimen approaches nearly and makes a gentle slope in case of small ferrite grain size under low stress level. 3. The difference of fatigue crack propagation velocity is large about the influence of shape of specimen at the same △K value under high stress level and that is approached under low stress level. 4. It can be had for light weighted purpose as use of hollow shaft with MEF dual phase and MEF dual phase steel demands minute ferrite grain size under low stress level. 5. It has been found that the shape of striation changes according to shape difference of specimen. The space of striation is narrow as the ferrite grain size and the stress level are small.