• Proceedings of the Korea Society of Design Studies Conference
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• 1999.05a
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• pp.70-71
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• 1999

시장에서 제품 성공에 중요한 요인들 중 빼놓을 수 없는 것으로 제품형태 즉, 디자인이 있다. 특히 특정한 주도자가 없는 복잡한 시장에서 제품 형태는 소비자의 주의를 끌 수 있는 할 방법이다. Broch(1995)의 논문에서 제시된 제품의 형태에 대한 소비자의 반응 모델을 살펴보면, 소비자가 제품에 대해 긍적적이거나 부정적인 반응을 보이는 데에는 제품의 형태에 대한 심리학적 반응들이 작용한다.(중략)

• The Korean Journal of Zoology
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• v.36 no.2
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• pp.245-263
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• 1993

신경성장인자 수용체(nerve growth factor receptor, HGFr)의 소재를 휜쥐 전뇌 기저부 핵들의 신경세포와 그 세포내 소기 관에서 연역세포화학적 방법으로 관찰하였다. NGFr에 면역반응을 보이는 신경세포들은 내측중격, 수직 및 수평대각선 브로카대, 거대세포 시삭전핵 그리고 Meynert 기저핵에는 다수 미상핵-피각과 복부담창구에는 소수 관찰 되었다 NGFr에 면역반응을 보이는 신경세포들은 형태학적으로 3가지 형 즉, 1) 난형(또는 원형). 2) 방추형, 3) 삼각형(또는 다각형)으로 구분되었다 내측중격은 주로 난형의 세포로 구성되었으며(91.2%), 수직 및 수평대각선 브로카대, 거대세포 시삭전핵 및 Meynert 기저 핵에는 난형의 세포가 높은 율로 구성되었으나, 방추형과 삼각형 세포들도 내측중격에서보다는 많았다 특히 복부담창구에는 다른 핵들에 비하여 방추형세포(25%)들이 높은 출현율을 보였다 일반적으로 이들 세포의 크기는 삼각형세포가 제일 컸으며, 방추형세포가 그 다음, 그리고 난형 세포가 제일 작았다 전자현미경적 관찰에서 0.05% triton X-100을 처리한 조직중 Meynert 기저핵을 관찰한 결과. Golgi체, multivesicular body 및 소포체들이 N6Fr에 면역반응을 보였으며. trion X-100을 처리하지 않은 조직에서는 단지 수평대각선 브로카대의 신경세포 원형질 막에서만 약한 면역반응을 보였다 위의 결과로 미루어 NGFr은 조연소포체에서 합성되어. Golgi체에서 농축되고, multivesicular body를 통하여 원형질막에 위치하게 되며, 원형질막에서 NGFr은 외래성의 NGF와 복합체를 형성한후, 궁극적으로는 Iysosome의 형태로 세포체 안으로 들어 가는 것으로 추정된다.

• The Korean Journal of Zoology
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• v.37 no.1
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• pp.1-11
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• 1994

임신 26주, 27주의 생명력이 없는 한국인 태아 2예를 대상으로 십이지장 점막에서의 장내분비세포군집(일부 일본인 학자들이 명명한 "Segi's cap")의 출현, 형태 및 구조를 관찰하고. 이들 세포군집에서 내분비세포들의 존재 및 면역조직 화학적 특징들을 관찰하고자, 파라핀조직절편과 냉동박절 후 hematoxvlin과 eosin염색. Azan염색, Comori법, 그리고 면역조직화학염색 표본을 제작, 관찰하여 다음과 같은 결과들을 얻었다 세포들의 군집 형태는 장 내강을 향해서는 오목한 형태였고, 기저막을 향해서는 볼록한 형태였다. 군집을 이룬 세포들은 중층을 이루었고. 술잔세포도 장 내캉목에서 관찰되었다 또한. 내강쪽에 위치한 세포들의 경우 미세융모들의 줄무의가장자리는 관찰되지 않았다 Leuenkephalin, somatostatin, substance p, vasoactive intestinal polypeptide 및 5-HT 항혈청을 이용하여 면역조직염색한 결과 somatostatin 양성반응세포와 5-HT 양성반응세포만이 관찰되었다. 이들 somatostatin 양성반응 세포와 5-HT 양성반응세포들은 대개가 원추형의 세포들로서 개구형을 이루고 있음을 관찰한 수 있었다.관찰한 수 있었다.

• Journal of Wetlands Research
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• v.15 no.2
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• pp.171-177
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• 2013

This study was conducted to find the leaf morphological responses of Quercus serrata and Q. aliena which are potential natural vegetation of riverine in Korea under elevated $CO_2$ and increased temperature. Rising $CO_2$ concentration was treated with 1.6 times than control(ambient) and increased temperature with $2.2^{\circ}C$ above the control(ambient) in the glass greenhouse. As a result, leaf width length, leaf lamina weight and leaf area of Q. serrata and Q. aliena was respectively increased, and number of leaves and specific leaf area(SLA) was decreased by elevated $CO_2$ and temperature. Leaf width length, leaf lamina length, leaf lamina weight, number of leaves, leaf area, and specific leaf area of Q. serrata were not statistically significant difference between control and treatment. Leaf width length and leaf weight of Q. aliena was increased, but specific leaf area was decreased. These results indicated that Q. aliena was to be sensitive than Q. serrata in response to global warming situation. According to the principal component analysis(PCA), two oak species were arranged based on factor 1 and 2 in the control and warming treatment. And change on the warming treatment was clearly distinguishable from the Q. aliena than Q. serrata.

• Applied Chemistry for Engineering
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• v.19 no.5
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• pp.471-476
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• 2008

The thermal and mechanical properties and morphology of epoxy/polyamide/DDS/2E4MZ-CNS reactive blends with various amounts of polyamide were investigated. The amount of polyamide was 10, 20, and 30 phr and 2 phr of catalyst was added to the blend to cure at $180^{\circ}C$ for 30 min. By adding the catalyst, 2E4MZ-CNS, to the blend, the cure reaction occurred at a lower temperature. From the SEM images, it was found that the boundary of separated-phase was unclear and the phase was co-continuous. Without the catalyst, however, the boundary of separated-phase was clear. The control of cure temperature and morphology could be achieved by using a proper catalyst and consequently the mechanical strength increased by 20% compared to the blend without the catalyst due to the strong interaction between epoxy matrix and phase-separated polyamide at the interface.

• Polymer(Korea)
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• v.33 no.4
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• pp.290-296
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• 2009

The morphology and mechanical properties of epoxy/polyamide/MPD/2E4MZ-CN reactive blends with various amount of catalyst were investigated. The cure behaviors, mechanical strengths, and morphological changes of the epoxy blend systems were analyzed by using DSC, UTM, and SEM, respectively. The amount of catalyst ranged from 0 to 3 phr, and the cure reaction occurred at $170^{\circ}C$ for 30 min. The maximum peaks in heat flow during cure reactions appeared at slightly lower temperature with increasing catalyst content, indicating that the cure reactions start at lower temperature by adding catalyst and polyamide rarely hinders the cure reaction paths. The co-continuous morphology was found in epoxy/polyamide(20 phr) blends and by adding catalyst to the blends much clearer and uniform co-continuous phase was observed. The surface tension of the mechanical test specimen was increased due to the AP plasma surface treatment, and then adhesion strength was increased by over 20% by adding 2 phr of catalyst to the blends. When considering morphological tuning of the blends by means of catalyst incorporation, it is expected that the increased elongation and adhesion strength can be achieved in the structural adhesive systems.

• Polymer(Korea)
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• v.33 no.4
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• pp.284-289
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• 2009

The morphology and mechanical properties of epoxy/polyamide/MPD reactive blends with various amount of polyamide were investigated. The cure behaviors, mechanical strengths, and morphological changes of the epoxy blend systems were analyzed by using DSC, UTM, and SEM, respectively. The amount of high soluble polyamide in epoxy ranged from 0 to 30 phr, and the cure reaction occurred at $170^{\circ}$ for 30 min. The start and maximum exothermic temperature in heat flows during cure reactions appeared at almost same temperature, indicating that soluble polyamide could rarely hinder the cure reactions. From the SEM images, it was found that the size of separated-phase was very fine about 100-300 nm, and at 20 phr of polyamide the boundary of separated-phase was unclear and the phase revealed co-continuous. By AP plasma treatment of specimen surface, the adhesion strength was increased by 20% due to enhanced surface free energy. By blending 20 phr of polyamide with epoxy, the adhesion strength was increased by 50% due to co-continuous phase in morphology. By considering the surface treatment of specimen and morphological tuning of the blends, it can be expected that the improvement in toughness and excellent adhesion strength can be achieved in structural adhesive systems.

• Clinical and Experimental Pediatrics
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• v.45 no.12
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• pp.1551-1558
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• 2002

Purpose : Loss of hippocampal interneurons in dentate gyrus has been reported in patients with severe temporal lobe epilepsy and in animals treated with kainic acid(KA). Interneurons contain $Ca^{2+}$- binding protein parvalbumin(PV). The effects of kainic acid on parvalbumin-immunoreactive (PV-IR) interneurons in dentate gyrus were investigated in organotypic hippocampal slice cultures. Methods : Cultured hippocampal slices from postnatal day nine C57/BL6 mice were exposed to $10{\mu}M$ KA, and were observed at 0, 8, 24, 48, 72 hours after a one hour KA exposure. Neuronal injury was determined by morphologic changes of PV-IR interneuron in dentate gyrus. Results : Transient(1 hour) exposure of hippocampal explant cultures to KA produced marked varicosities in dendrites of PV-IR interneuron in dentate gyrus and the shaft of interbeaded dendrite is often much thinner than those in control. The presence of varicosities in dendrites was reversible with KA washout. The dendrites of KA treated explants were no longer beaded at 8, 24, 48 and 72 hours after KA exposure. The number of cells in PV-IR interneurons in dentate gyrus was decreased at 0, 8 hours after exposure. But there was no significant difference in 24, 48 and 72 hours recovery group compared with control group. Conclusion : The results suggested that loss of PV-IR interneurons in dentate gyrus is transient, and is not accompanied by PV-IR interneuronal cell death.

• Polymer(Korea)
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• v.35 no.3
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• pp.249-253
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• 2011

The effect of morphological development in PET/PEN blending on the physical properties of PET/PEN blend film as a flexible substrate was investigated. The two phase morphology was obtained in PET/PEN blends and it caused the improvement of dimensional stability of PET/PEN blend as a flexible substrate. The two phase morphology and crystallinity of PET/PEN blends could be controlled by the transesterification between PET and PEN during the film processing and this macroscopic structural development affected the dimensional stability of PET/PEN blend films. Better dimensional stability was obtained with increasing crystallinity and decreasing the level of transesterification.

• Journal of the Korean Ceramic Society
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• v.12 no.4
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• pp.37-42
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• 1975

철(II)이온을 안정화 하기위하여, 2산화 규소와, 구상, 입방체상 및 침상의 서로 다른형태의 산화 제2철로부터 규산철을 합성하였다. 메타놀증기로 포화시킨 질소까스를 튜브로에 도입시켜 얻은 환원성 분위기속에서, 114$0^{\circ}C$에서 11$65^{\circ}C$의 온도범위에서, 가스유속을 0.13 및 0.25l/min. 로서, 환원시간 4-150분동안 교상반응을 진행하였다. 반응생성의 동태를 오르자트 가스분석으로 검토하였으며, 생성물의 확인은 X-선 회절시험 및 감량정량에 의하였으며, 결과는 다음과 같다. 1 : 1.1의 몰비로 혼합한 산화제2철과 2산화 규소의 경우, 가스유속이 0.13l/min일 때, 규산철 합성반응시간은 구상, 입방체상 및 침상산화철에 있어서 각기 8-27분, 10-16분 및 6-7분으로 구상의 경우가 범위가 가장 넓었다. 또한, 반응속도는 산화제2철의 표면적의 평방근에 비례하였고 반응시간의 평방근에 역비례하였다.