• The Transactions of the Korea Information Processing Society
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• v.4 no.4
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• pp.1100-1105
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• 1997

The verial black stripe is one of the defects in a chrge-coupled device(CCD). Vertical black stripes are caused by some signal chrges which fail to transport form the vertical CCD region to the horizontal one. The defective transport of signal charges orignates in the potential barrier with the narrow width effects in the verti-cal-horizintal interface stuccture. The vertical black stripes show up when the charge transfer dfficiency is less than 99.2% under the low illumination condition. In this research, we designed and developed a new vertical-horizontal interface structre of a delta type, thus marking it possible to eliminate the vertical black stripes.

• Korean Chemical Engineering Research
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• v.46 no.4
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• pp.686-691
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• 2008

There are no many research reports on the preparation of ZnO by electrochemical oxidation since the zinc oxide is very easily dissolved in an acidic or basic environment, even though zinc oxides have attracted many attentions because of their optical/electrical properties. In this paper, we describe the fabrication of self-ordered stripes of ZnO by anodization of Zn in an ethanolic sulfuric acid. The formation of stripes of ZnO originating from Zn is attributed to water-selective dissolution of ZnO during anodization. We study in detail the effects of concentration of $H_2SO_4$, applied potential, anodization time, and addition of a small amount of water on the fabrication of stripes of ZnO. Mechanisms for the fabrication of ZnO stripes are discussed in terms of the above-mentioned effects.

• Applied Microscopy
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• v.32 no.1
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• pp.45-55
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• 2002

The worm of Thelazia callipaeda Railliet et Henry, 1910 (The oriental eye worm) was frequently observed in the eyes of animal and human in Korea. But it did not clearly describe about the ultrastructural character on the sensory papillae and cuticular striation of the worm. This study was performed to investigate the ultrastructure and character on the cuticular surface of the worm that was extracted from the eyes of two patients in Korea University Medical Center, using the scanning electron microscopy. According to the mouth, 1/4, 1/2, 3/4 and tail portion of the worm, the size of cuticular striation on each portion was measured. The size of cuticular striation on the worm surface was $1.8{\mu}m$ in the mouth and tail portion, $4.0{\sim}4.5{\mu}m$ in the middle portion of the worm. On the scanning electron microscopy, the female worms were developed phasmids in the tail end and male worms were developed sensory papillae and external sexual organ on the tail end. The sensory papillae on the tail end were composed anterior ventral postcloacal papillae, middle ventral postcloacal papillae, subventral postcloacal papillae, and lateral papillae. According to the result in this study, it is considered that the character of the cuticular striation and the sensory papillae were able to accept as classifying key for the identification of species.

• Applied Microscopy
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• v.35 no.3
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• pp.135-152
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• 2005

Prefrontal cortex is a psychological and metaphysical cortex, which deals with feeling, memory, planning, attention, personality, etc. And it also integrates above-mentioned events with motor control and locomotor activities. Prefrontal cortex works as a highest CNS center, since the above mentioned functions are very important for one's successful life, and further more they are upgraded every moments through memory and learning. Many of these highest functions are supposed to be generated via forebrain basal nuclei (caudate nucleus, fundus striati nucleus, accumbens septi nucleus, septal nucleus, etc.). In this experiment, prefrontal efferent terminals within basal forebrain nuclei were ultrastructurally studied. Spraque Dawley rats, weighing $250{\sim}300g$ each, were anesthetized and their heads were fixed on the stereotaxic apparatus (experimental model, David Kopf Co.). Rats were incised their scalp, perforated a 3mm-wide hole on the right side of skull at the 11mm anterior point from the frontal O point (Ref. 13, Fig. 1), suctioned out the prefrontal cortex including cortex of the frontal pole, with suction instrument. Two days following the operations, small tissue blocks of basal forebrain nuclei were punched out, fixed in 1% glutaraldehyde-1% paraformaldehyde solution followed by 2% osmium tetroxide solutions. Ultrathin sections were stained with 1% borax-toluidin blue solution, and the stained sections were obserbed with an electron microscope. Degenerating axon terminals were found within all the basal forbrain nuclei. Numbers of degenerated terminals were largest in the caudate nucleus, next in order, in the fundus striati nucleus, in the accumbens septi nucleus, and the least in the septal nucleus. Only axospinous terminals were degenerated within the caudate nucleus and the fundus striati nucleus, and they showed the characters of striatal motor control system. Axodendritic and axospinous terminals were degenerated within the accumbens septi nucleus and the lateral septal nucleus, and they showed the characters of visceral limbic system. Prefrontal role in integrating the limbic system with the striatal system, en route basal forebrain nuclei, was discussed.

• 한국전자현미경학회:학술대회논문집
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• 1999.11a
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• pp.54-58
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• 1999

GaAs 위에 증착된 ZnTe 박막의 계면 구조를 투과 전자 현미경을 이용하여 관찰하였다. 2-빔 조건을 사용하여 관찰된 계면에서 모아레 즐무늬가 관찰되었으며, 이러한 모아레 줄무늬의 생성원리를 규명하였다. 또한 고분해능 투과 전자현미경상으로부터 얻어진 결과와 비교하여 ZnTe의 성장방식 전이 및 섬 구조를 가지는 ZnTe 박막의 여러 가지 구조적 성질들 - 섬의 크기, 변형량, $60^{\circ}$ 전위의 분포 등 - 에 대해 밝혔다. 이러한 결과들은 큰 변형량이 걸린 반도체 이종 접합 구조의 해석에 일반적으로 적용될 수 있다.

• Korean Journal of Veterinary Research
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• v.36 no.1
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• pp.39-49
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• 1996

The present study was performed to investigate the distribution of neuropeptide Y immunoreactivities in the corpus striatum of the Korean squirrels. The animals were perfused with 4%-paraformaldehyde and the brain was cut serially into $40{\mu}m$ thick coronal sections. Sections either were stained with cresyl violet or were stained immunohistochemically. The corpus striatum was divided into the caudate nucleus, putamen and globus pallidus. Anterior part. however, of the striatum was observed as the combined caudate-putamen. NPY immunoreactive (NPY-IR) neurons were medium-sized. The corpus striatum contained a low level of NPY-IR fibers, whose distribution appeared to be related to the immunoreactive perikarya. Large numbers of NPY-IR neurons in the caudate-putamen and caudate nucleus were expressed in medial and ventral parts. In the anterior part of the putamen NPY-IR neurons were scattered throughout the nucleus; in posterior part were found generally in the lateral and ventral parts. The density of NPY-IR fibers of the putamen were low, whose distribution appeared to be related to the perikarya. The globus pallidus contained NPY-IR fibers only in the lowest density. In brief, NPY-immunoreactivities in the corpus striatum are heterogenous in distribution. These findings may reflect innate characteristics of the specific neural circuit in the corpus striatum itself.

• Korean Journal of Optics and Photonics
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• v.17 no.3
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• pp.285-289
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• 2006

A novel alignment-free micro-optic MZI filter has been demonstrated. The filter is composed of two fiber-pigtailed collimators and a beam-splittingplate with a periodically etched stripe pattern. We fabricated the plate through a standard lithographic formulation process by using a pyrex substrate glass with SU-8 resist coating on its one of the surfaces. The maximum insertion loss of the implemented filter was less than 2 dB over 1000 nm to 1600 nm and the extinction ratio was larger than 33 dB. The measured PDL within the 3-dB pass band of the filter was less than 0.15dB and the maximum extinction ratio variation was less than 2 dB even when the worst alignment error occured.

• The Journal of the Korea Contents Association
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• v.13 no.11
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• pp.523-532
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• 2013

Since conventional methods for the reconstruction of 3D objects used a number of cameras or pictures, they required specific hardwares or they were sensitive to the photography environment with a lot of processing time. In this paper, we propose a 3D object reconstruction method using one photograph based on structured light in ubiquitous environments. We use color pattern of the conventional method for structured light. In this paper, we propose a novel pipeline consisting of various image processing techniques for line pattern extraction and matching, which are very important for the performance of the object reconstruction. And we propose the optimal cost function for the pattern matching. Using our method, it is possible to reconstruct a 3D object with efficient computation and easy setting in ubiquitous or mobile environments, for example, a smartphone with a subminiature projector like Galaxy Beam.

• Journal of the Korean Vacuum Society
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• v.5 no.4
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• pp.387-390
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• 1996

The study has been performed that the high purity of platinum crystal was grown by rf floating zone refined technique. Direct electric current was also present to examine the controlling striated structure during the sample grown. It has been proved that current and orientation could affect suppression of the striation structure in Pt. Substructure in Pt was thermally unstable and was able to be removed by the annealing technique.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.610-615
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• 2003

This experiment has been carried out to find the structure of turbulent boundary layer with instantaneous velocity fields obtained in stream-wall-normal planes using a stereo-PIV (Particle Image Velocimetry) method. And it has been measured perpendicular plane and horizontal plane with hairpin vortex structure by Reynolds number change and made third dimension shape for section of horizontal plane through stereo-PIV. In the outer layer hairpin vortices occur in streamwise-aligned packets that propagate with small velocity dispersion. A streaky structure is composed of counter-rotating vortex. According as y+ increases, streaky structure's interval space decrease, and it shows that hairpin shape of prior research is vertified. The objective of the present research is to gain a better understanding of coherent structures in the outer of wall turbulence by experimentally examining coherent structures.