• The Korean Journal of Zoology
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• v.33 no.1
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• pp.12-21
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• 1990

When a piece of the dorsal skin(cat fish) was observed under a light microscope, melanophores were horizontally expanded and had a few processes filled with melanosomes. They were isolated from one another. Some melanophores looked black, while others were d&k brown. On observation with a transmission electron microscope, the epidermal melanophore of cat fish was highly branched and small segments of processes were found frequendy m the vidnity of the interecellular spaces. The cross section of the processes of melanophore was almost circular, and often invested by a thin layer of epidermal cells. Some processes, however, occurred free m the wide interecellular spaces or at the cytoplasm of the superilcial layers. In the mature melanophore, the cell organelles including melanosomes, mitochondria and free ribosomes were prominent in the perinuclear portions. Many melanosomes were spherical or elipsoidal in shape. Each melanosomes was surrounded by a limiting membrane. The processes of the mature melanophore were well developed, but the processes of the immature melanophores were incompletely developed.

• Journal of Plant Biology
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• v.38 no.1
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• pp.73-78
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• 1995

리기다소나무 추출액을 농도별로 무와 차풀에 처리한 3일 후에 광학현미경을 이용하여 근단세포를 관찰할 경우 6% 처리구에서는 피층세포가 신장되었으나, 25%, 75% 처리구에서는 오히려 세포 표면이 위촉되어 불규칙하게 변화됨으로써 표면부 전체가 심한 굴곡현상을 나타내었다. 특히 차풀에 있어서 75% 처리구의 표피층은 작고 불규칙한 세포들로 상당히 비후되어 있었다. 투과전자현미경으로 근단의 세포를 관찰한 결과 무의 처리구는 대조구에 비하여 표피세포의 원형질막 함입현상이 활발하였고 세포벽은 전자밀도가 높은 과립들이 층상으로 분포해 있었다. 피층세포와 중심주의 유세포에서는 중앙 액포가 발달하였고 지질과립이 감소하였으며 전분형성체가 자주 관찰되었다. 차풀의 처리구는 대조구에 비하여 세포질의 퇴행현상이 심화되었고 일부 잔존한 세포질내에는 중앙 액포가 발달하였는데 그 액포막의 안쪽에는 높은 전자밀도의 물질이 축적되었으며 피층세포와 중심부의 유세포에서는 전분형성체가 뚜렷이 존재하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.102-109
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• 2019

This paper describes the design of the circuit card assembly to eliminate the communication error on a servo control unit installed in the automated resupply vehicle K56. K56 is a weapon system that automates the supply and loading of ammunition on the K-55A1 self-propelled artillery. As the core item responsible for ammunition movement control, the servo control unit is required to have good communication stability and reliability, but the conventional unit has recognized a problem that communication error intermittently occurs, resulting in an emergency stop phenomenon. We analyzed the communication signal of the servo control unit and identified the failure cause of the circuit card assembly to solve this problem. In addition, the signal interference in data/address line of the circuit card assembly was confirmed through analysis of the failure cause, and redesigned to avoid the interference, such as adjustment of the distance between communication lines and position change. Finally, the proposed cause analysis and redesign were verified through the component of servo control unit and attachment test on K56. We expected these study results to be used as reference for the design of other similar items.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.208-210
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• 2012

웹 어플리케이션 서버를 통해 동작하는 웹 어플리케이션에 대해 기능 일부를 수정하고자 할 때, 런타임 변경이 가능하고, 어플리케이션 서버의 재시작이 필요 없는 방법에 대해 설명한다. 이러한 방법은 웹 어플리케이션의 동적 설정을 위해 사용할 수 있으며, 변경된 내용을 반영하는데 1) 서버로 어플리케이션 전체를 재배포할 필요가 없으며, 2) 변경될 부분을 부분 코드에 국한시켜 웹 어플리케이션에서 자주 발생되는 SQL 기술문의 변경이나 비지니스 로직에 대한 작은 변경을 간편하게 수정하고 실행시킬 수 있다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.207-208
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• 2002

휘발성 유기화학물질 (VOCs)이 인체의 건강에 미치는 영향은 아직까지도 명확하게 밝혀지진 않았지만 대부분의 물질이 재실자에게 자극과 불쾌감을 유발하며, 여러 종류의 발암성 물질을 포함하고 있는 것으로 알려지고 있다 휘발성 유기화학물질 중에서 80% 정도가 인체의 호흡기관을 자극하고 눈의 통증이나 자극을 유발하며, 이중에서 25% 정도는 발암성 물질로 파악되고 있다. (중략)

• Cartoon and Animation Studies
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• s.33
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• pp.363-382
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• 2013

Up until about ten years ago, the use of typography played only an auxiliary role on broadcast television programs, primarily by transmitting information in order to facilitate a basic understanding of content. Recently, however, kinetic typography has become an important component in broadcast production. In fact, kinetic typography has developed into a visual language and a means of artistic expression, one that is increasingly used in the production of entertainment programs on television. This paper analyzes six aspects of kinetic typography: manner of development, location, intent, expressive techniques, color and font selection. Particular attention is placed on their use in three highly rated television entertainment programs: "2 Days & 1 Night", "Running Man", and "Infinite Challenge". The development way consists of the technique : starts off with cut and ends with cut. While, other techniques show conversation and situation representation using Z axis : zoom-in, zoom-out in , X axis : pan in <2 Days & 1 Night>. and Y axis : tilt in . Typographic design elements, expression technique, color, font are shown up according to the feature of each program. The resulting analysis suggests new ways for motion arts designers and the broadcast media to use kinetic typography in the development of television programs.

• Applied Microscopy
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• v.29 no.4
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• pp.437-450
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• 1999

Bile canaliculi are the structure delivering bile secreted by hepatocytes into the bile passage. Bile secretion is mainly controlled by the cytoskeletal elements, mainly of actin in the microvilli, pericanalicular web. Most studies on the bile secretion have been done in viva situation, however, to control the various parameters in vitro culture system seem to be more useful. To set up an in vitro experimental system, the investigator isolated hepatocytes with an enzymatic method using a mixture of collagenase and hyaluronidase from normal Sprague-Dawley rat liver and cultured. Isolated hepatocytes were round and formed cords in culture. Microvilli covered the whole surface of hepatocytes. Bile canaliculi were formed between hepatocytes and were characterized by the presence of microvilli of various lengths and shapes mainly arising from small surface mounds. Actin filament core in the microvilli and pericanalicular actin web were incomplete. After cytochalasin D treatment, cultured hepatocytes were round but the surface were irregular with surfacen blebs, folds and grooves. Microvilli on the surface were scarce. Bile canaliculi were markedly dilated often with the detached junctional complexes. Bile canaliculi lacks microvilli almost completely and extended into the pericanalirular cytoplasm showing complex vacuolar and tubular structures by transmission electron mciroscopy. Pericanalicular actin web, intermediate filaments were hardly identified. Subsurface actin filaments were scattered scarcely under the cell membranes. These results suggest that hepatocytes isolated from rats can survive and form bile canaliculi in culture and the actin filaments are involved in the formation and/or maintenance of the bile canaliculi.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.12
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• pp.3767-3781
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• 1996

Generally, dynamic loads are applied to real structures. Since the analysis with the dynamic load is extremely difficult, static loads are utilized by proper conversions of the dynamic loads. The dynamic loads are usually converted ot static loads by safety foactors of experiences. However, it may increase weight and decrease reliability. In this study, a method is proposed for the conversion process. An equivalent static load is calculated ot generate a same maximum displacement. The method is verified through numerical tests on a spring-mass systems of one and multi degrees-of freedom. It has been found that the duration time of the loads and the natural frequencies of the structures are critical in the conversion process. A road arem is a self-propelled howizer is selected for the application of the proposed method. The shape of the road arm is optimized under the converted static loads.

• Korea Trade Review
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• v.44 no.3
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• pp.85-104
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• 2019

As exporting countries are limited compared to the export market of civilian industries, an approach should be preceded by a comprehensive evaluation of the purchasing availability of exportable markets and the status of potential competitive markets, as well as an analysis of the technology related to weapons systems. Based on the case of K9 self-propelled howitzers, a leading overseas export weapons system, this research was conducted to clarify the process of selecting the export market for Korean defense products and to verify it using a survey of weapons systems experts. In particular, this study specifically suggested the methodology needed to select the final exportable market through the analysis procedures such as competition and similar weapons systems, key performance identification, and identification of export-oriented markets, while considering the characteristics of the Defense Industrial Products. Based on these analysis results, the government proposed a method of selecting a major export market to enhance the possibility of weapons exports by domestic defense companies. Therefore, the study results can be used as a basis for objectively assessing the priorities for exportable markets, considering the possibility of exporting weapons systems that are under research and development or will be improved in the future.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.2
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• pp.229-236
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• 2016

For this research, the trajectory of a projectile was simulated via the multibody dynamics analysis of a self-propelled mortar. The dynamic model was composed of a mortar model and a vehicle model, and was simulated using the RecurDyn program. Interior ballistic was applied to the mortar model, and exterior ballistic was conducted by Matlab using the simulation results of the interior trajectory. Through repetitive Monte-Carlo simulations, the accuracy of the mortar was analyzed by considering variations in the aiming angle and vehicle dynamic response.