• 전기전자학회논문지
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• 제27권4호
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• pp.399-404
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• 2023

본 논문에서는 3D NAND Flash memory의 O/N/O(Oxide/Nitride/Oxide) 구조와 blocking oxide를 ferroelectric material로 대체한 O/N/F(Oxide/Nitride/Ferroelectric) 구조의 current path를 분석했다. O/N/O 구조는 V_read가 인가되면 neighboring cell의 E-field로 인해 current path가 channel 후면에 형성된다. 반면 O/N/F 구조는 ferroelectric material의 polarization으로 인해 electron이 channel 전면으로 이동하여 current path가 전면에 형성된다. 또한 channel thickness와 channel length에 따른 소자 특성을 분석했다. 분석 결과 O/N/F 구조의 전면 electron current density 증가는 O/N/O 구조보다 2.8배 더 높았고 O/N/F 구조의 전면 electron current density 비율이 17.7% 높았다. 따라서 O/N/O 구조보다 O/N/F 구조에서 전면 current path가 더 효과적으로 형성된다.

• 산업기술연구
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• 제28권B호
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• pp.9-14
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• 2008

In the Reporting Cell Location Management (RCLM) system, a subset of cells in the network is designated as the reporting cells. Each mobile terminal performs location update only when it enters one of these reporting cells. When a call arrives, the paging is confined to the reporting cell the user last reported and the neighboring bounded non-reporting cells. Frequent location update may result in degradation of quality of service due to interference. Miss on the location of a mobile terminal will necessitate a search operation on the network when a call comes in. We must decide the number of reporting cells and which cell should be reporting cell to balance the registration (location update) and search (paging) operations to minimize the cost of RCLM system. This paper proposes a simulated annealing (SA) for optimization of RCLM system.

• 산업공학
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• 제19권2호
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• pp.168-173
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• 2006

In the Reporting Cell Location Management (RCLM) system, a subset of cells in the network is designated as the reporting cells. Each mobile terminal performs location update only when it enters one of these reporting cells. When a call arrives, the paging is confined to the reporting cell the user last reported and the neighboring bounded non-reporting cells. Frequent location update may result in degradation of quality of service due to interference. Miss on the location of a mobile terminal will necessitate a search operation on the network when a call comes in. We must decide the number of reporting cells and which cell should be reporting cell to balance the registration (location update) and search (paging) operations to minimize the cost of RCLM system. This paper proposes a ranking ant colony system (RACS) for optimization of RCLM system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.583-586
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• 2002

In this research, we propose a flexible conveying system (FCS) which consists of multiple arrays of cells. Each cell is a wheel driven by a two degree-of-freedom mechanism. The direction and velocity of cell are controlled based on the concept of hybrid control under a distributed network. Each cell has its own controller under a subsumption architecture for low-level control. A cell communicates with its four neighboring cells to manipulate n targeted object towards its desired position. The high-level control assigns a desired position and direction of the object to each cell. The path of each object is generated by many supporting cells. Moreover, the FCS can handle multiple objects simultaneously. To study the flexible conveying system, a GUI-based simulator of flexible conveying system is constructed. The simulated results show that the system can handle multiple objects independently and simultaneously under the proposed hybrid control architecture.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.539-542
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• 2003

We have studied cell gap-dependent electrode-optic characteristics of the FFS mode using the LC with negative dielectric anisotropy. In case of a small cell gap of 2 ${\mu}m$, the transmittance at the center of pixel and common electrodes is low due to stronger influence of surface anchoring that holds the LC to the initial state than twisting force induced by neighboring LCs. In case of a large cell gap of 4 ${\mu}m$, the influence of surface anchoring force becomes weak so that the LCs at the center of pixel and common electrode can be twisted enough by applied voltage, giving rise to high transmittance. Therefore, we conclude that the light efficiency in the device is dependent on the cell gap.

• 디지털산업정보학회논문지
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• 제18권4호
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• pp.31-40
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• 2022

YOLOv4 can be used for detecting parking vehicles in order to check a vehicle in out-door parking space. YOLOv4 has 9 anchor boxes in each of 13x13 grid cells for detecting a bounding box of object. Because anchor boxes are allocated based on each cell, there can be existed small observational error for detecting real objects due to the distance between neighboring cells. In this paper, we proposed YOLOv4 grid cell shift algorithm for improving the out-door parking vehicle detection accuracy. In order to get more chance for trying to object detection by reducing the errors between anchor boxes and real objects, grid cells over image can be shifted to vertical, horizontal or diagonal directions after YOLOv4 basic detection process. The experimental results show that a combined algorithm of a custom trained YOLOv4 and a cell shift algorithm has 96.6% detection accuracy compare to 94.6% of a custom trained YOLOv4 only for out door parking vehicle images.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2005년도 추계 학술대회논문집
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• pp.131-134
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• 2005

Conventional high order interpolation schemes are limitative in several aspects mainly because they need data of neighboring cells at the reconstruction step. However, discontinuous Galerkin method and spectral volume method, two high order flux schemes which will be analyzed and compared in this paper, have an important benefit that they are not necessary to determine the flow gradients from data of neighboring cells or elements. These two schemes construct polynomial of variables within a cell so that even near wall or discontinuity, the high order does not deteriorate.

• 한국정보과학회논문지:정보통신
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• 제31권5호
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• pp.490-500
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• 2004

모바일/무선 환경하에서 이음새없는(seamless) 이동성 관리 문제는 많은 연구의 대상이 되고 있다. 그러나 핸드오프 이후에 등록을 함으로써 사용중 끊김이 발생하거나, MN가 인접한 셀로 이동할 확률이 같다는 Random Work 모델을 사용함으로써 불필요한 네트워크 트래픽을 발생시키는 문제들이 있었다. 본 논문에서는 이러한 문제를 해결하여 이음새없는 이동성을 제공하는 방향성 사전등록 영역(DSRR) 구성 기법과 알고리즘을 제안한다. DSRR의 핵심은 핸드오프할 확률이 높은 인접 셀(AAAF)을 최소한으로 구성하여 사전 등록을 수행함으로써 끊김과 불필요 트래픽 발생을 방지하는 것이다. 이를 위해 셀 분할 스킴을 도입하였다. 셀을 영역적으로 분할(Regional Cell Division)하여 핸드오프 시기를 감지하였으며, 셀의 방향성 분할(Directional Cell Sectoring)로 계산된 방향벡터(DV: Direction Vector)를 적용하여 MN의 이동방향을 반영하였다. 결과적으로 본 논문에서 제안한 DSRR은 노드간 메시지 교환이 인트라도메인 내에서 처리되므로 끊김은 인터도메인 환경에서 처리되는 기존 연구들에 비해 현저히 줄었으며, 또한 핸드오프마다 발생하는 트래픽은 인접한 셀의 개수(n)만큼 발생하던 기존 연구에 비해 DSRR에서는 2번으로 감소하였다.

• Journal of Photoscience
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• 제9권2호
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• pp.213-216
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• 2002

Skin pigmentation, also known as complexion coloration, results from the biosynthesis of melanin within the melanocytes of the Stratum basalum and the subsequent transfer, translocation, and degradation of this pigment to, in, and by the neighboring keratinocytes respectively, Melanins are produced and retained in melanosomes synthesized in the cell body that are translocated along the dendrites using microtubules via motor proteins. Melanosomes are eventually captured and retained at the tips of dendrites by attachment to the peripherally localized actin. Melanosomes reaching the dendritic tips are transferred to keratinocytes, primarily via phagocytosis of released melanosomes by keratinocytes. Molecules responsible for cell/cell recognition and interaction that regulate transfer are being identified. Some of these putative mediators appear to be affected by ultraviolet radiation. After the keratinocytes receive melanosomes, the granules are distributed individually or as clusters in dark versus light skin respectively. These melanosomes are then aggregated over the nucleus for photoprotection ofkeratinocyte DNA and eventually degraded.

• 한국환경보건학회지
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• 제27권1호
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• pp.100-105
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• 2001

Microstructural examinations were performed on the anaerobic biofilm from reactor filled with PE support media. Optical microscope, SEM and fluorescent microscope were used for qualitative and morphological studies on the attached microorganism under anaerobic condition. Microorganisms were attached in crevices where protection from shear forces of surfaces where easy to contact with support media surface. A hypothesis for biofilm accumulation occurs on a surface such as polymer support media is presented schematically : 1st step ; cell-support media attachment, 2nd step ; cell-support media attachment and cell-cell attachment, 3rd step ; attached biofilm from neighboring crevices joins together and growing, 4th step ; mature and irregualar biofilm was formed. In SEM photographs, shape and structures of biofilm were observed, but microorganism species and methanogens were not identified. A large number of methanogenic bacteria were identified on the surface of PE substratum by fluorescence under 480nm of radiation and it was estimated that methanogenic bacteria was related to initial attachment of bacteria under anaerobic condition.