• 대한본초학회지
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• 제35권1호
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• pp.9-18
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• 2020

Objectives : We tried to establish standards for genuine by discriminating 3 kinds of pollen and spore herbs that are highly to be mixed with each other. Using an scanning electron microscope, we prepare a standard for discriminating external morphological characters of minute herbs, thereby contributing to the stable supply of genuine herbal medicines. Methods : Standard samples were confirmed by literature review on external morphological characteristics of original plants and herbal medicines, and collection and identification of original plants. The herbal medicines on the market were purchased and classified with using naked eye observation and magnifier. Finally, micromorphological identifications were conducted using an scanning electron microscope. Results : 1. Pini Pollen was clearly distinguished by its relatively medium size and a pollen grain with two swollen reticulate sacci at both ends. The verrucate ornamentation on the exine surface of the corpus and a sunken leptoma germ pore may be used as a discrimination criteria. 2. Typhae Pollen was distinguished by its relatively small size and a saccus on the end of a pollen grain. Reticulate ornamentation of exine surface of the corpus, and a slightly clear ulcerate germ pore can be used as a discrimination criteria. 3. Lygodii Spora was distinguished by its relatively large triangular-ovate shape and trichotomous fissure. Verrucate-tuberculate ornamentation of exine surface and trilete aperture could be used as a discrimination criteria. Conclusion : These results indicate that the use of electron microscopy is very effective for discriminating the external morphology of minute herbal medicines.

• 한국한의학연구원논문집
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• 제12권3호통권18호
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• pp.91-100
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• 2006

The purpose of this study was to introduce the differential standard of the types of Acori Graminei Rhizoma. We established the classificatory standard according to the external and internal morphology for the several types of Acori Graminei Rhizoma. 1. External shape: Acorus gramineus has smaller size and fibroidal section. A. calamus has bigger size and cancellate section. A. tatarinowii has middle size and fibroidal section. Anemone altaica has very small long-spindle shape and flat section that has 6-12 row of vascular bundle. 2. Internal shape: Acorus gramineus has some bundle sheath fiber, but A. calamus has not. A. tatarinowii has many calcium oxalate crystalloid around bundle sheath. Anemone altaica has obscure cambium. All sample except A. altaica, in the mass, has scattered bundle, thin cell wall, broad cortex and well-developed endodermis. For the future, such results will be used as the basic source of additional research, and a far-reaching comparative study is needed to distinguish between many kinds of same genus-degree of relatedness.

• 한국연초학회지
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• 제26권1호
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• pp.57-63
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• 2004

A comparative analysis of characteristics of domestic and foreign reconstituted tobacco based on papermaking was conducted to evaluate the quality of reconstituted tobacco and to utilize as basic data for improvement of domestic reconstituted tobacco. In the formation, which is key factor to quality and physical properties of product, foreign reconstituted tobacco has better uniform formation than those of domestic one. These result was attributed to distribution of large floc size in the domestic one unevenly. In the fiber morphology, domestic reconstituted tobacco has larger average fiber length and width than those of foreign one. They indicated that fiber morphology of domestic one will exert structural properties of paper such as formation and permeability. Tensile strength of domestic one has lower than those of foreign one by basis weight. In the air permeability, domestic one was remarkably reduced because base web was over sized. It also will affect the combustibility of reconstituted tobacco. In summary, we conclude that the physical and structural properties of domestic reconstituted tobacco result in quality deviations compared with foreign reconstituted tobacco.

• Journal of Forest and Environmental Science
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• 제14권1호
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• pp.14-23
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• 1998

본 논문에서는 나방류 유충의 형태를 상세히 관찰하고 비교연구에 Key가 되는 형질에 관하여 조사하였다. 1. 두부(頭部) : 단안(單眼), 촉각(觸角), 상순(上脣), 하순(下脣), 상악(上顎), 하악(下顎), 자모(刺毛), 전액봉선(前額縫線), 부전액봉선(副前額縫線), 중봉선(中縫線). 2. 흉부(胸部) : 전배판(前背板), 기문(氣門), 자모(刺毛)와 자모배열(刺毛配列). 3. 복부(腹部) : 미배판(尾背板), 복각(腹脚)의 crochets, 기문(氣門), 자모(刺毛)와 자모배열(刺毛配列).

• 생명과학회지
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• 제11권1호
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• pp.54-61
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• 2001

The comparative morphology of epididymal spermatozoa in the lesser white-toothed shrew, Crocidura suaveolens, the Japanese white-toothed shrew, C. dsinezumi and the big white-toothed shrew, C. lasiura, belonging to the subfamily Crocidurinae was studied with the light and electron microscopes. The spermatozoa of C. lasiura and C. dsinezumi were characterized by the large acrosome, serrated inner acrosomal membrane, common apical body and fistulous proximal centriole with slightly dense electron granular materials, which are the charateristics of the Crocidurinae. The C. suaveolens, however, is distinguished from the two species mentioned above in the sperm morphology. That is, the spermatozoa possess not only the charateristic of the Crocidurinae such aw the large acrosome, but also those of the Soricinae, i.e. the smooth inner acrosomal membrane, wavy, finger-like and electron-dense apical body, and the solid proximal centriole filled with electron-dense materials. The results suggest that C. suaveolens has conserved characteristics of the Soricinae.

• 대한치과교정학회지
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• 제14권1호
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• pp.7-13
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• 1984

A roentgeno cephalometric comparative study was undertaken to reveal significant differences of craniofacial morphology and growth between unilateral cleft lip and palate and normal individuals. The material for this study consisted 32 subjects with repaired unilateral cleft lip and palate (27 male, 5 female) and 44 normal subjects (22 male, 22 female). The analysis was performed by Coben's method and the measurements were compared by Student's t-test. The following conclusions were obtained. 1. In the UCLP subjects there is definite decrease in midfacial growth, so they showed concave profile. 2. The ramus inclination angle and AR-GO of UCLP subjects are larger than normal subjects. 3. The craniofacial height of UCLP subjects is smaller than normal subjects, especially in midface. 4. The lower part of craniofacial height of UCLP subjects is larger than normal subjects.

• Journal of Plant Biology
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• 제35권4호
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• pp.339-358
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• 1992

한국산 나자식물 6개과에서 대표적인 1종씩을 선정하여 수피의 특징을 형태 및 해부학적으로 조사하고 기재하였다. 수피를 인위적으로 조직단위로 간주할 경우 수피의 색, 두께, 내수피와 외수피의 두께, 확장조직의 유무 및 발달정도, 조피내 주피의 층우와 주피의 층수와 주피의 구성요소들의 두께, 2기 사부지역 각 구성요소들의 배열양상과 점유면적 비율 등은 종류에 따라 차이를 보였다. 또한 보강세포의 형태와 사세포의 사역 등도 앞으로 상세한 조사가 수행될 경우 비교형태학적 연구에 매우 가치있는 정보를 제공할 것으로 생각되었다.

• 한국생산제조학회지
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• 제19권5호
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• pp.653-659
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• 2010

Friction stir welding results in low distortion and high joint strength compared with other welding procedures, and is able to join all aluminium alloys that are not considered as virtually weldable with classical liquid state techniques. The comparative study on high cycle fatigue properties between A16005-T6 friction stir welds and MIG weld joints have been performed and fracture mechanisms for the fatigue specimens were investigated. Although mechanical properties are lower than the corresponding base material, FSW joints of A16005-T6 become higher at tensile and fatigue strength in comparison with the traditional fusion weld(MIG). The fracture surfaces of FSW and MIG fatigue specimens cleary show different aspects of the fracture morphology. MIG weldments were characterized by voids and cleavage(brittle fracture) but FSW specimens showed the presence of ductile fracture surface.

• 한국표면공학회지
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• 제47권4호
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• pp.168-173
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• 2014

The paper presents the comparative results of TiAlN coatings deposited by DC and pulsed DC asymmetric bipolar magnetron sputtering systems. The results show that, with the decreasing duty cycle and increasing pulse frequency, the coating morphology changes from a columnar to a dense structure, with finer grains. Pulsed sputtered TiAlN coatings showed higher hardness, higher residual stress, and smaller grain sizes than dc prepared TiAlN coatings. Moreover residual stress of pulsed sputtered TiAlN coatings increased on increasing pulse frequency. Meanwhile, the surface roughness decreased continuously with increasing pulsed DC frequency up to 50 kHz.

• 한국표면공학회지
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• 제48권4호
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• pp.136-141
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• 2015

The paper presents the comparative results of NbN coatings deposited by DC and pulsed DC asymmetric bipolar magnetron sputtering systems. The results show that, with the decreasing duty cycle and increasing pulse frequency, the coating morphology changes from a columnar to a dense structure, with finer grains. The Pulsed sputtered NbN coatings showed higher hardness, higher residual stress, and smaller grain sizes than those of DC prepared NbN coatings. Moreover residual stress of pulsed sputtered NbN coatings increased on increasing pulse frequency. Meanwhile, the surface roughness decreased continuously with increasing pulsed DC frequency up to 50 kHz.