• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 추계종합학술대회
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• pp.129-132
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• 2001

Mobile host들로 이루어진 망을 Ad hoc 망이라고 한다. 이러한 환경에서는 각 mobile node host들의 무선 전송 전파 범위의 한계 때문에 하나의 mobile host로 패킷을 목적지에 전달하기 위해서는 다른 host들간의 협력이 필수적이다. 또한 고정된 라우터가 없이 mobile host들이 라우터로 동작하므로 기존의 라우팅 프로토콜 알고리즘들은 Ad hoc 망에서는 효율적일 수 없다. 본 논문에서는 기존에 제시된 Ad hoc 망 라우팅 프로토콜들을 시뮬레이션을 통해 그 성능을 비교 분석 하고자 한다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권3호
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• pp.341-346
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• 2006

Despite many studies, results of superovulation protocols are not consistent in farm animals. In this study, 151 Boer goats were superovulated to examine the factors affecting superovulation and embryo transfer (MOET). An optimal regime for superovulation treatment was identified as a 4-day treatment with decreasing dosages of 6-7 mg Chinese FSH or 240 mg Canadian FSH. The 4-day treatment with decreasing dosages of 6-7 mg Chinese FSH was, therefore, adopted to study effects of the age of does, season and repeated treatments on superovulation and embryo transfer. The best season for superovulation and embryo transfer and pregnancy was autumn, and the best age range was 12-35 months old. Within animals there were no significant differences in the number of ovulations and the rate of transferable embryos between the first and the second superovulation. However, these parameters declined significantly for the third superovulation. No marked effects of the number of ovulations on the proportion of transferable embryos were noted. The parturition rate of the recipients receiving single embryos was not different significantly from those receiving two embryos, and the kidding rate calculated from embryos transferred did not differ significantly between recipients receiving one and two embryos.

• 정보처리학회논문지C
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• 제16C권5호
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• pp.629-636
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• 2009

무선 센서 네트워크에 사용되는 센서들은 제한된 배터리에 의해서 가동되며 배터리의 수명이 다하면 센서 네트워크가 정상적으로 동작할 수 없으므로 각 센서들의 에너지를 효과적으로 사용하는 라우팅 기법이 사용되어야 한다. 이러한 라우팅 기법 중에 가장 널리 알려진 기법이 LEACH와 PEGASIS 기법이나 LEACH(혹은 LEACH-C) 기법은 헤드 노드의 전력 소모가 심하여 다른 노드보다 먼저 수명을 다하는 단점이 있으며 PEGASIS 기법은 LEACH 기법보다 성능이 우수한 것으로 알려져 있으나 소스 노드에서 싱크노드로 데이터를 전송하기 위해 매우 긴홉을 통과하여 데이터가 전달되기 때문에 전송시간이 길고 싱크 노드에 가까운 노드들의 에너지 소모가 급격하게 진행된다는 단점이 있다. 본 논문에서는 LEACH의 클러스터링 기법과 PEGASIS 기법 체인연결 기법을 혼합하여 사용함으로써 센서네트워크를 보다 오래 사용할 수 있는 하이브리드 기법을 제시하였으며 LEACH-C 기법보다는 33% PEGASIS 기법보다는 18%의 성능의 향상을 가져올 수 있었다.

• 한국환경농학회지
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• 제33권4호
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• pp.271-281
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• 2014

BACKGROUND: Application of the transfer functions derived from local soil data is necessary in order to develop proper management protocols for agricultural soils contaminated with heavy metals through phytoavailability control of the heavy metals. The aim of this study was to derive the transfer functions of Korean agricultural soils affected by the abandoned mining sites and evaluate suitability of the derived transfer functions. METHODS AND RESULTS: 142 agricultural soils affected by the abandoned mining sites were collected and analyzed. Two extraction methods, including 1 M $NH_4NO_3$ extraction and 0.01 M $Ca(NO_3)_2$ extraction were applied to determine phytoavailable metal pools in soils. Multiple stepwise regression of phytoavailable metal pools against the corresponding total metal concentration and soil properties was conducted to derive suitable transfer functions for estimating phytoavailable heavy metal pools. Applicability of the derived transfer functions was examined by calculating NME and NRMSE. CONCLUSION: Soil pH and organic matter were valid variables for derivation of the transfer functions which were applicable for estimating phytoavailable metal concentrations in the soils being contaminated by heavy metals. In addition, it was confirmed that transfer functions need to be developed based on local soil conditions to accurately estimate heavy metal-phytoavailability.

• 패션비즈니스
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• 제20권3호
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• pp.30-42
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• 2016

The objective of this study was to perform 3D solid modeling from 3D scanned surface images of cotton and silk in order to calculate the thermal heat transfer responses using numerical simulations. Continuing from the previous methodology, which provided 3D surface data for a fabric through optical measurements of the fabric microstructure, a simplified 3D solid model, containing a defined unit cell, pattern unit and fabric structure, was prepared. The loft method was used for 3D solid-model generation, and heat transfer calculations, made for the fabric, were then carried out using the 3D solid model. As a result, comprehensive protocols for 3D solid-model generation were established based on the optical measurements of real fabric samples. This method provides an effective means of using 3D information for building 3D models of actual fabrics and applying the model in numerical simulations. The developed process can be used as the basis for other analogous research areas to investigate the physical characteristics of any fabrics.

• Clinical and Experimental Reproductive Medicine
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• 제51권1호
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• pp.85-90
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• 2024

Objective: The purpose of this study was to compare fresh and frozen-thawed euploid blastocyst transfer protocols following preimplantation genetic screening (PGS) in cases of advanced maternal age. Methods: A total of 330 patients were examined retrospectively. PGS was performed on the embryos of 146 patients for whom fresh transfers were chosen. In contrast, frozen-thawed euploid single embryo transfer (ET) was selected after PGS for 184 patients, and their embryos were vitrified. The percentage of euploid embryos and rates of implantation, pregnancy, and pregnancy continuity, as well as clinical and biochemical abortion rates, were compared. Results: The numbers of retrieved oocytes, metaphase II oocytes, and fertilized ova were greater in the frozen-thawed group. The percentages of euploid embryos were comparable between the fresh and frozen-thawed groups (32% vs. 34.8%, respectively). The rates of implantation (46.6%vs. 62.5%), pregnancy (50% vs. 66.8%), ongoing pregnancy (38.4% vs. 53.8%), and live birth percentage (37.0% vs. 53.8%) were significantly higher in the frozen-thawed group. However, no significant differences were found in the clinical and biochemical abortion rates. Conclusion: The use of frozen-thawed single euploid ET is associated with increased implantation and pregnancy rates compared to fresh single euploid ET with PGS.

• Molecules and Cells
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• 제25권4호
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• pp.462-466
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• 2008

Adenoviruses are the most commonly used gene-delivery vectors due to the efficiency of their in vivo gene transfer. Since 1993, about 300 protocols using an adenoviral vector have been performed, although they have yet to be proven effective in clinical trials. The adenovirus-based vector has been continuously improved by modification of the adenoviral genome and capsid, and novel adenovirus-delivery systems, such as the carrier-cell delivery system, have been recently proposed. Adenovirus-based cancer gene therapy is fast becoming one component of a multi-modality treatment approach to advanced cancer, along with surgery, radiotherapy, and chemotherapy.

• 한국콘텐츠학회논문지
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• 제6권8호
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• pp.30-37
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• 2006

현재 CDMA 규격으로 정의되어 있는 TIA/EIA/IS-637-A의 단문메시지 전송 규격에는 보안을 위한 별도의 대책이 포함되어 있지 않다. 따라서 필요할 경우 이러한 단문메시지에 별도의 보안대책을 강구하는 것이 바람직할 것으로 보인다. 이 논문에서는 기존의 단문메시지 서비스에 높은 수준의 기밀성과 무결성의 보안을 제공하고 아울러 적정한 수준의 인증 기능을 제공함으로써 단문메시지를 통한 개인 정보의 유출을 방지하여 예상치 못한 사고에 대비하고 사생활을 보호할 수 있는 단문 메시지 서비스를 위한 보안 알고리즘을 제안한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.927-930
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• 2003

In this paper, a design of processor IP for TCP/IP protocol stack is described. The processor consists of input and output buffer memory with dual bank structure, 32-bit RISC microprocessor core, DMA unit with on-the-fly checksum capability. To handle the various modes of TCP/IP protocol, hardware and software co-design approach is used rather than the conventional state machine based design. To eliminate delay time due to the data transfer and checksum operation, DAM module which can execute the checksum operation on-the-fly along with data transfer operation is adopted. By programming the on-chip code ROM of RISC processor differently. the designed stack processor can support the packet format conversion operations required in the various TCP/IP protocols.

• Journal of Electrochemical Science and Technology
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• 제9권2호
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• pp.149-156
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• 2018

In this technical note, I report the analysis of electrochemical impedance data measured with potential sweeping. Even though the instruments for voltammetric impedance measurements have been developed for decades using different approaches, their applications are limited due to the lack of well-established protocols to easily analyze voltammetry data. To fill this gap, the singular point of the specific potential is considered that is only determined by the standard/formal potential and the transfer coefficient and is independent of the kinetics and experimental parameters (including revertability) of faradaic reactions. Taking the advantage of its inertness, I suggest an approach employing the singular point as a reference to obtain general electrochemical information. As all the concepts and methods are verified with numerical simulations, this technique is expected to be applied for complex reactions involving electrochemical and chemical reaction mechanisms.