• Korean Journal of Breeding Science
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• v.49 no.3
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• pp.170-179
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• 2017

Plant molecular farming has attracted a lot of attention lately in the field of mass production of industrially valuable materials by extending application of the plant as a kind of factory concept. Among them, protein expression system using rice(Oryza sativa L.) callus is a technology capable of mass culture and industrialization because of a high expression rate of a target protein. This study was carried out to develop an Agrobacterium-mediated transformation system to increase the utilization of rice callus. The transformation efficiency was improved by using the hand when seeds were de-husked for callus induction. Furthermore, we were possible induction of callus from 6 years old seed smoothly. Selection of the callus contained the target gene was required a cultivation period of at least 3 weeks, and the most efficient selection period was after 6 weeks of culture including one passage. This selection was confirmed that the gene was stably inserted into the genomic DNA of the plant cell by the southern blot analysis and progeny test. Such an efficient selection system of rice callus that can be cultured in the long term will be contribute to the industrialization of useful recombinant proteins using rice.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.23-27
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• 1997

정보검색 시스템이나 웹(Web)이 방대해지고 초보적 수준의 사용자들이 늘어남에따라 간단한 조작만으로 원하는 정보를 얻어 낼 수 있는 도구의 개발이 점점 중요해지고 있다. 일반적으로 정보검색 시스템 (검색엔진 포함)의 검색되는 결과의 수는 정보검색 시스템 별로 다양하고 많은 시스템들이 검색을 못하거나 방대한 결과를 제시한다. 본 논문은 방대한 결과를 여러가지 다양한 view로 볼 수 있고 사용자의 피드백에 의해 정보를 재 검색함으로서 검색하고자 하는 문서를 보다 정확하게 검색할 수 있도록 도와주는 결과 렌즈 (Results Lens: RL)를 제안한다. 본 논문에서 제시한 결과 렌즈는 다양한 view로의 결과를 수정(refine) 할 수 있으며 웹을 기반으로하는 플러그인(plug-in)으로 제공함으로써 유용성 및 확장성이 크다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.558-560
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• 2000

본 논문은 ATM(Abstract Timed Machine)에 대해서 기술한다. ATM 은 임무 위급 시스템과 같은 실시간 시스템을 명세, 분석 및 검증할 수 있는 정형 기법이다. ATM 은 모드(mode), 전이(transition), 포트(port)로 구성된다. 모드는 머신의 압축된 상태를 의미하고 전이는 모드와 모드 사이의 변화를 말한다. 포트는 ATM 들 사이의 상호작용을 위한 진입을 나타내기 위한 것이다. ATM 은 소프트웨어 순환 공학을 위해 디자인 되었다. ATM은 재/역공학적 측면에서 계산 이론과 더불어 기존의 실시간 시스템의 소스코드에 대한 디지안 및 환경 정보를 나타낸다. 본 논문은 병렬성, 병렬적으로 동작하는 엔터티들 사이의 제어 정보이 흐름, ATM 타입과 클래스로부터의 인스턴스, 비/동기적 이벤트, 포트와 이벤트 타입, 포트의 타입, 통신, 입/출력, 예외처리, 시간에 관한 요구사항, 다수를 대상으로 하는 통신 주기적 작업등과 같은 ATM의 여러 개념을 기술하고 이러한 속성들을 Producer-Buffer-Consumer 예제로 살펴본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.99-102
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• 2020

센서/외부사건 연동을 지원하는 인터랙티브 디지털 사이니지(Interactive Digital Signage)가 활발히 전개되고 있다. 그런데, 현재 전개되고 있는 대부분의 인터랙티브 사이니지 시스템은 정해진 인터랙션에만 맞추어 설계되어 지원되기 때문에, 추가적인 인터랙션 기능이 요구되는 경우에 재프로그래밍하여야 한다. 다양한 센서 입력, 외부사건 발생 등에 대한 반응을 유연하게 지원하는 데 있어서 규칙엔진 지원이 유용하다. 본 논문에서는 규칙 메타데이터 변환 및 이의 규칙엔진과의 동기화 방안을 제시하고, 이를 활용하여 다양한 센서/외부사건 연동 인터랙션을 유연하게 지원하는 규칙엔진 기반 인터랙브 기지털 사이니지 시스템의 설계 및 구현을 보고한다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.13 no.4
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• pp.283-293
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• 2015

The buffer is a key component of the engineered barrier system in a high-level radioactive waste (HLW) repository. The present study reviewed the requirements and functional criteria of the buffer reported in literature, and also based on the results, proposed an approach to establish a buffer concept which is applicable to an HLW repository in Korea. The hydraulic conductivity, radionuclide-retarding capacity (equilibrium distribution coefficient and diffusion coefficient), swelling pressure, thermal conductivity, mechanical properties, organic carbon content, and illitization rate were considered as major technical parameters for the functional criteria of the buffer. Domestic bentonite (Ca-bentonite) and, as an alternative, MX-80 (Na-bentonite) were proposed for the buffer of an HLW repository in Korea. The technical specifications for those proposed bentonites were set to parameter values that conservatively satisfy Korea's functional criteria for the Ca-bentonite and Swedish criteria for the Na-bentonite. The thickness of the buffer was determined by evaluating the means of shear behavior, radionuclide release, and heat conduction, which resulted in the proper buffer thickness of 0.25 to 0.5 m. However, the final thickness of the buffer should be determined by considering coupled thermal-hydraulic-mechanical evaluation and economics and engineering aspects as well.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.8
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• pp.50-58
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• 2009

Fourth generation mobile communication network have the technology of extensive form include basic service technology and it has been developed from the radio access technology and network topology. Not only fourth generation mobile communication network have basically done new highspeed radio access technology which is suitable to high and low speed environment of transfer, but also it is possible that they have been made for freely vertical handover. ETRI also has made fourth generation mobile communication network which is WiNGS(Wireless Initiative for Next Generation Service) satisfied that demand. This paper is made by lossless handover method through the local retransmission ARQ agent that is one of the main technology of fourth generation mobile communication network. Lossless handover method through local retransmission ARQ agent has been basically made by WiNGS and it was better than original local retransmission of layer by simulation.

• Journal of the Earthquake Engineering Society of Korea
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• v.5 no.4
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• pp.67-74
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• 2001

Structural engineers lately have an interest in the safety for equipments and facility in buildings subjected to earthquake. The stability of cultural assets was not considered for the earthquake induced vibration, while the integrity of structure has been considered through the resistant earthquake design. The purpose of this study aimed to analyze the behavior of isolation device named as \"Isolation table system\" and to evaluate its isolation performance through the experiment study. Isolation table is one of isolation systems to reduce the vibration which was transferred from slab to exhibition table. Experimental result shows that isolation table can reduce the vibration by 80-90% and its behavior is very stable within its maximal stroke.al stroke.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.7 s.361
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• pp.81-87
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• 2007

While conventional frequency reuse techniques for cellular communication systems divide frequency resources into multiple regions and each mobile is statically assigned to a certain frequency region, frequency reuse techniques for cellular OFDMA communication systems can be regarded as dynamic scheduling problems of finding best-fitted subcarriers for each packet transmission. Unlike conventional frequency reuse techniques allocating mutually exclusive frequency resources to adjacent cells, this paper proposes the use of a frequency reuse technique with irregular frequency allocation patterns assigned statically based on the cell numbers. This paper shows that the use of irregular frequency patterns can allow efficient interference avoidance and high data throughputs comparable to those with carefully planned frequency patterns.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.11a
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• pp.180-181
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• 2019

South Korea has long been without major earthquakes. But 317 public facilities have been damaged by Po-Hang earthquake. Among them, 103 educational facilities suffered 25.6 billion won worth of damage. This is the most damaging of public facilities. The earthquake damage was mainly centered on non-seismic retrofit educational facilities and masonry architectural wall systems installed on the outer walls of buildings. Therefore, the purpose of this study is to develop a filling material that can be applied to the non-seismic retrofit of masonry architectural wall systems installed on the outer walls of educational facilities. To achieve the objective, first, set the filling material requirements. Second, set the sequence model of experiments and prepare for the experiment. Third, after the experiment, analyze the results obtained through the experiment. Forth, the optimal filling material is selected by comparing the analyzed results with the requirements. As a results, E-S-X sample using epoxy resin were selected for the seismic retrofit of masonry architectural wall systems in educational facilities. In the future, this study can be used as a basic material for developing seismic reinforcement methods guidelines in domestic existing educational facilities.

• Journal of Aerospace System Engineering
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• v.10 no.4
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• pp.50-58
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• 2016

In our preceding study, we reported that the use of light, composite-material wings in long-endurance Solar-Powered UAVs is a critical factor. Ribs are critical components of wings, which prevent buckling and torsion of the wing skin. This study was undertaken to design and manufacture optimal composite ribs. The ribs were manufactured by applying laminated-layer patterns and shapes, considering the anisotropic properties of the composite material. Through the finite element analysis using the MSC Patran/Nastran, the maximum load and the displacement shape were identified. Based on the study results measured by structural tests, we present an optimal design of ribs.