• 한국주조공학회지
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• 제31권3호
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• pp.145-151
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• 2011

Metallic foam has been known as a functional material which can be used for absorption properties of energy and sound. The unique characteristics of Al foam of mechanical, acoustic, thermal properties depend on density, cell size distribution and cell size, and these characteristics expected to apply industry field. Al-Zn-Mg-Cu alloy foams was fabricated by following process; firstly melting the Al alloy, thickening process of addition of Ca granule to increased of viscosity, foaming process of addition of titanium hydride powder to make the pores, holding in the furnace to form of cooling down to the room temperature. Metal foams with various porosity level were manufactured by change the foaming temperature. Compressive strength of the Al alloy foams was 2 times higher at 88% porosity and 1.2 times higher at 92% porosity than pure Al foams. It's sound and vibration absorption coefficient were higher than pure Al foams and with increasing porosity.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.1031-1040
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• 1996

Spawn bottle cutting and spawn cake shredding machine has been developed to save the farm labor and operating cost for mushroom growing farmers. The prototype can cut the bottom and side of the bottle while shredding the spawn cake by one farmer. The cutting plastic shell is done by two couples of high speed disc saws that can cut cross section and lengthwise two side of the bottle, while spawn cake shredding is done by spike teethed rotating drum and wiremesh concave. The optimum speed of cutting disc saw was observed 1.700rpm both the cross cutting saw and lengthwise cutting saw in consideration of the cutting accuracy. And the location for the instalation of cross cutting disc saw was considered as around 4 mm above the table bottom , while the optimum clearance between two edges of lengthwise cutting disc saw was showed 86mm. For the sawdust spawn cake shredder , proper size of spawn sawdust granule was observed in the 15 x 15mm size withmesh concave with the shredding rum speed of 500rpm. The prototype can be reduce 73 per cent of working hours with the working cost reduction of 49 per cent compare with those of conventional operation.

• 한국동물학회지
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• 제26권2호
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• pp.107-123
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• 1983

The globus pallidus of normal cats were prepared for electron microscopic study following perfusion with a mixture of 1% paraformaldehyde and 1% glutaraldehyde solution. Neurons of two size categories were identified in 1 $\\mu$m araldite sections and their ultrastructural characteristics were studied in adjacent thin section. 1. Large neurons ($30 \\mum \\times 45 \\mum$ in diameter) had extensive areas of rough surfaced endoplasmic reticulm, abundant perinuclear Golgi complex, numerous mitochondria and lipofusin granule, and had a large spherical nucleus with shallow indentation of nuclear manbrane. Small neurons ($17 \\mum \\times 27 \\mum$ in diameter) had poorly rough surfaced endoplasmic reticulum, moderate number of mitochondria and randomly distributed Golgi complex. The nuclear envelope of this cell frequently showed multiple deep invagination. 2. Three types of axo-somatic synapses were identified on the basis of the size and shape of vesicle in the axon terminal and the symmetrical or asymmetrical thickening at the synaptic site. Type I synaptic terminal shows an even distribution of round and oval synaptic vesicles, and has a symmetrical synaptic thickening. Type II axon terminals reveal mostly round and pleomorphic vesicles and a few vesicles were localized near the presynaptic membrane in pale axoplasm and its synaptic thickening were symmetric. Type III axon terminals contain round vesicles, which were aggregated in the axoplasm, and has a asymmetrical synaptic thickening. 3. The majority of axo-somatic contact with the large and small neurons were type I, and type II and III synapes were rare.

• 한국식품조리과학회지
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• 제5권1호
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• pp.53-62
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• 1989

분질감자인 남작, 중간질감자인 세풍과 수미, 점질감자인 대지마로부터 전분을 분리하여 입자의 형태, 이화학적 성질 및 호화 특성을 비교 검토하였다. 전분입자는 모두 원형과 타원형이고 입자의 크기는 남작과 세풍 전분은 $11~30\mu\textrm{m}$ 수미와 대지마 전분은 $21~40 \mu\textrm{m}$의 입자가 주를 이루었다. Blue value, 아밀로오스 함량, 상대결정도, 밀도는 남작 전분이 가장 높았으며 대지마전분이 가장 낮았다. 물결합 능력, 팽윤력, 광투과도, 아밀로그라프에 의한 최고점도와 breakdown은 수미전분이 가장 높았으며 남작 전분이 가장 낮았다. 호화개시온도는 남작 전분이 가장 높았으며 수미 전분이 가장 낮았다. DSC에 의한 호화엔탈피는 품종간의 차이가 뚜렷하지 않았다.

• Animal cells and systems
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• 제1권2호
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• pp.381-388
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• 1997

Glutamate is a putative excitatory neurotransmitter in the central nervous system. The present study utilizing monoclonal antibodies against fixative-modified glutamate analyzed the distribution of glutamate-immunoreactive neuronal elements in the dog basilar pons. The glutamatergic neurons were present throughout the rostrocaudal extent of the basilar pons, predominantly to the medial and ventral subdivisions. Labelled cells were relatively sparse in the midline region of the medial nucleus and most lateral area of the lateral nucleus. The majority of glutamate-immunoreactive neuronal somata in the basilar pons was multipolar-shaped, and the size was in the range of 15-25 ${\mu}$m in diameter. Glutamate-immunoreactive axons and terminals were also observed at specific regions of the basilar pons. These observations provide evidence that this excitatory neural element functions in a multisynaptic pathway involving glutamatergic afferents to the basilar pons, pontocerebellar projection neurons, and the granule cells of the cerebellar cortex.

• 한국작물학회지
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• 제54권2호
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• pp.198-202
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• 2009

The starch properties of two chinese yams were evaluated in this study. Amylose content ranged 13.5% to 19.3%. The swelling power of starches varied 10.98% to 11.43%. Water binding capacity in chinese yam starches ranged 93.46% to 107.21%, high WBC was observed in Ma 1. The onset temperature (To) of two chinese yam starches ranged 62.9 to $75.0^{\circ}C$, peak temperature (Tp) ranged 76.2 to $84.7^{\circ}C$. The PHI(peak height index) was about 4-fold higher in Anwon cultivar than in Ma 1 cultivar. SEM revealed that starches has a presence of large oval or spherical to small irregular-shape granules. Starch granule size ranged 15.23 to 15.52 ${\mu}m$, showing a typical C-type X-ray pattern.

• Journal of Ginseng Research
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• 제5권2호
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• pp.114-121
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• 1981

Starch was isolated from 4-year-old and 6-year-old ginseng roots and its physical and chemical characteristics were studied. The results obtained were summarized as follows. 1. The shape of ginseng starch granules was polygonal and rounded with its granule size ranging from 2.0 to 7.5$\mu$. The swelling power of 4-year-old ginseng starch was much greater than that of 6-year old ginseng starch. Gelatinization pattern showed that 6-year-old ginseng starch gelatinized rapidly at $65^{\circ}C$, whereas 4-year-old starch continued to gelatinize, without having a definite gelatinization temperature as temperature increased 3. Amylogram of ginseng starch showed that gelatinization initiated at 61$^{\circ}C$ and was completed at 88$^{\circ}C$ with its viscosity reaching at 810 B.U. 4. The amylose contents were 32% and 9% for 4-year-old and 6-year-old ginseng starch, respectively. 5. X-ray diffraction analyses indicated that there were some structural differences between 4-year-old and 6-year-old ginseng starch.

• Journal of Pharmaceutical Investigation
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• 제13권4호
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• pp.191-195
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• 1983

Acetaminophen, fenbufen, and mefenamic acid tablets were formulated with the same additives, granulated to different sizes, ranging $30{\sim}200mesh$, and compressed by pressure of $0.5{\sim}2.0\;ton{\cdot}cm^{-2}$. The hardness and disintegration time of the three tablets were determined. The dissolution rates of the three tablets at critical point of pressure were investigated. The results showed that fenbufen, and mefenamic acid tablet had critical compression pressure of $1.0\;ton{\cdot}cm^{-2}$, but acetaminophen tablet had that of $1.5\;ton{\cdot}cm^{-2}$. Neverthless, three tablets were disintegrated within 5 min. Among the three tablets, mefenamic acid tablet followed zero order of dissolution and the rate constants were as fellows; $1.68 \;mg{\cdot}min^{-1}\;(30{\sim}50mesh),\;1.76mg{\cdot} min^{-1}\;(50{\sim}80\;mesh)\;and\;4.85\;mg{\cdot}min^{-1}\;(80{\sim}200mesh)$.

• Journal of Ginseng Research
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• 제8권2호
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• pp.114-123
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• 1984

This study was conducted to investigated the morphology and distribution of starch granule in ginseng root. The results obtained are as follows; The starch contents of main and lateral ginseng 1$.$cot were 23-32% and 14-16%, respectively, and it was varied significantly with growing season, namely 15-37% in Summer (May to August) and 3-6% in Winter (November to March). Thus the starch content of ginseng root was different depending on the portien of ginseng root and growing seasons, but a significant difference was not observed by a growing period of ginseng. The starch granules showed nearly round or oval shape having the diameter 2-8${\mu}$ and their size were increased with a growing period of ginseng. The crystalline structure of starch granules was found to be B-type by X-ray diffraction study.

• 마이크로전자및패키징학회지
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• 제6권4호
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• pp.35-39
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• 1999

The $Li_2O-MgO-MgF_2-SiO_2$glasses with addition of $B_2O_3$ were investigated in order to make glass-ceramics for low temperature firing substrate. Glasses were made by melting at $1450^{\circ}C$ in the electronic furnace and crystallized at $750^{\circ}C$. The crystal phases were polycrystalline of lithium boron fluorphlogopite and lithium fluorhectorite. The crystal shape was chanced to granule type from needle type with increasing $B_2O_3$ content. Average particle size of the glass-ceramics after water swelling was 3.77$\mu\textrm{m}$. The optimum sintering temperature and sintering shrinkage of the substrate were $900^{\circ}C$ and 13.4%, respectively.