• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.173-176
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• 2020

사물인터넷의 사용이 급격히 증가함에 따라 관련 보안 기술의 개발이 매우 중요하게 되었다. 사물인터넷이 지니는 근본적인 자원 제한 요소 환경을 극복하기 위해, 최근 Chatterjee 기타 등은 정량화된 질의 응답 기반의 PUF를 활용한 인증 프로토콜을 최근 IEEE Transactions on Dependable and Secure Computing 저널에 제안하였다. 그러나 장치 간 세션 키를 주고받는 과정에서 공개된 채널에서 값을 한번 획득한 공격자는 누구나 세션 키를 만들 수 있는 치명적인 취약점이 존재한다. 본 논문에서는 이러한 취약점을 설명하고 정당한 장치만 세션 키를 만들 수 있는 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.6-8
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• 2021

슈퍼컴퓨터 5호기 누리온은 8,437대의 계산노드와 33.88PB 규모의 병렬스토리지가 100Gbps의 Omni-Path(OPA) 인터커넥트로 연결되어 있는 초대형 클러스터 시스템이다. 누리온의 계산자원은 PBS 작업스케줄러를 통해 관리되고 있고 병렬 스토리지는 DDN사의 Exascaler Monitoring System(ESMON)을 통해 influxDB에 read/write IO 통계 데이터를 수집하고 있다. 본 논문에서는 PBS의 과금 데이터와 ESMON influxDB의 IO 통계 데이터를 활용하여 사용자의 작업별 IO 통계 정보를 생성하는 방안에 대하여 소개한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.408-410
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• 2022

최근 데이터 획득 위치에 가장 근접하고, 저 수준의 계산력을 제공하는 엣지 기기를 중심으로 직접 딥러닝 추론을 수행하고자 하는 요구가 증가하고 있다. 본 논문에서는 드론에서 촬영한 교통 영상 데이터를 기반으로, 다수의 차량 종류 및 보행자를 식별하는 모델을 Jetson Nano 에 탑재하여 기본 성능을 측정한다. 더불어, 자원제약형 기기 환경에서 TensorRT 와 Deepstream 을 활용하여 객체 식별 모델의 연산 경량화 및 추론 가속화 성능을 극대화하기 위한 구현 및 실험을 수행하여 Anchor-based 및 Anchor-free 객체 식별 모델의 정확도와 실시간 대응력을 평가하고 논의한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.516-519
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• 2008

최근 엔터프라이즈 애플리케이션은 J2EE 컴포넌트로 개발된다. J2EE 플랫폼은 애플리케이션을 개발하는데 편리한 기능을 제공한다. 하지만 J2EE 애플리케이션의 테스트는 J2EE 서버 내부에서 자원을 관리하는 컨테이너의 접근 통제 때문에 기존의 테스트 방법으로 수행하기 어렵다. 본 논문에서는 J2EE 환경에 맞는 J2EE 애플리케이션의 테스트 방법을 제안한다. 이 방법은 애플리케이션을 구성하는 EJB 컴포넌트를 정적 및 동적 분석하여 획득한 정보로 애플리케이션의 메소드 커버리지를 분석하고, 메소드 커버리지를 향상시키기 위한 테스트 데이터를 생성하여 J2EE 애플리케이션을 테스트한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.439-442
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• 2008

국가연구개발사업은 국가연구개발사업의 관리 등에 대한 규정 제17조에 의거하여 연구개발결과를 활용하는데 그 목적을 가진다. 그러나, 사실상 최근 국가연구개발사업을 통해 개발된 연구기술들은 특허 등의 라이선스를 획득하고 기술이전을 통해 사업화로 이어지는 사례가 매우 미미하다. 실제로 2005년 산업자원부의 조사에 따르면, 국가연구개발사업의 사업화 성공률은 평균 31.4%로 선진국의 1/2에도 못 미치는 수준이다. 따라서, 본 논문에서는 국가연구개발사업의 예산 대비 기술이전 및 확산을 통한 기술사업화 성공률을 높이기 위한 하나의 방법으로, 연구과제 평가 시 기술의 가치를 평가하여 그 평가결과를 예산배분에 반영 할 수 있도록 기술가치평가방법을 활용한 R&BD(Research &Business Development) 활성화를 위한 평가항목 및 개발될 기술의 사업성을 평가할 수 있는 평가모델을 설계하였다.

• Resources Recycling
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• v.32 no.1
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• pp.42-49
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• 2023

The glass ceramic secondary resource containing Li-Al-Si is used in inductor, fireproof glass, and transparent cookware and accounts for 14% of the total consumption of Li, which is the second most widely used after Li-ion batteries. Therefore, new Li resources should be explored when the demand for Li is exploding, and extensive research on Li recovery is needed. Herein, we recovered Li from fireproof Li-Al-Si glass ceramic, which is a new secondary resource containing Li. The fireproof glass among all Li-Al-Si glass ceramics was used as raw material that contained 1.5% Li, 9.4% Al, and 28.9% Si. The process for recovering Li from the fireproof glass was divided into two parts: (1) calcium salt roasting and (2) water leaching. In calcium salt roasting, a sample of fireproof glass was crushed and ground below 325 mesh. The leaching efficiency was compared based on the presence or absence of heat treatment of the fireproof glass. Moreover, the leaching rates based on the input ratios of calcium salt, Li-Al-Si glass, and ceramics and the leaching process based on calcium salt roasting temperatures were compared. In water leaching, the leaching and recovery rates of Li based on different temperatures, times, solid-liquid ratios, and number of continuous leaching stages were compared. The results revealed that fireproof glass ceramics containing Li-Al-Si should be heat treated to change phase to beta-type spodumene. CaCO₃ salt should be added at a ratio of 6:1 with glass ceramics containing Li-Al-Si, and then leached 4 times or more to achieve a recovery efficiency of Li over 98% from a solution containing 200 mg/L of Li.

• Geophysics and Geophysical Exploration
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• v.26 no.2
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• pp.52-61
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• 2023

The use of ultra-high-resolution (UHR) seismic surveys to preceisly characterize coastal and shallow structures have increased recently. UHR surveys derive a spatial resolution of 3.125 m using a high-frequency source (80 Hz to 1 kHz). A digital streamer system is an essential module for acquiring high-quality UHR seismic data. Localization studies have focused on reducing purchase costs and decreasing maintenance periods. Basic performance verification and application tests of the developed streamer have been successfully carried out; however, a comparative analysis with the existing benchmark model was not conducted. In this study, we characterized data obtained by using a developed streamer and a benchmark model simultaneously. Tamhae 2 and auxiliary equipment of the Korea Institute of Geoscience and Mineral Resources were used to acquire 2D seismic data, which were analyzed from different perspectives. The data obtained using the developed streamer differed in sensitivity from that obtained using benchmark model by frequency band.However, both type of data had a very high level of similarity in the range corresponding to the central frequency band of the seismic source. However, in the low frequency band below 60 Hz, data obtained using the developed streamer showed a lower signal-to-noise ratio than that obtained using the benchmark model.This lower ratio can hinder the quality in data acquisition using low-frequency sound sources such as cluster air guns. Three causes for this difference were, and streamers developed in future will attempt to reflect on these improvements.

• Korean Journal of Breeding Science
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• v.41 no.4
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• pp.444-450
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• 2009

Amplified fragment length polymorphism (AFLP) marker was utilized for evaluation of genetic diversity of 60 pear germplasms. Twenty selective AFLP primer pairs generated a total of 522 polymorphic amplification products. From UPGMA (unweighted pair-group method arithmetic average) cluster analysis by using polymorphic bands, the pear germplasms were divided into four clusters by similarity index of 0.691. The first cluster (I) included European pears belonging to Pyrus communis and wild species such as P. nivalis and P. cordata. The second cluster (II) included Ussurian pea pears belonging to P. betulaefolia and P. fauriei. The third cluster (III) included pea pears belonging to P. calleryana and P. koehnei. Most of germplasms belonging to P. pyrifolia and P. ussuriensis, and interspecific hybrids were included in the fourth (IV) cluster. Therefore pear germplasms originated from East Asia were closely related to P. pyrifolia and P. ussuriensis. Similarity values among the tested pear germplasms ranged from 0.584 to 0.879, and the average similarity value was 0.686.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.14 no.4
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• pp.39-49
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• 2019

The government is actively implementing a start-up infrastructure and start-up support policy for successful start-up companies. However, the actual success rate of start-up companies is not high. In order to improve the performance of a start-up company, it is necessary to have a strategy that has the right entrepreneurship and efficiently utilizes its resources. In particular, opportunity exploration, resource acquisition and resource reorganization are dynamic capabilities that are very necessary for the growth of a start-up company. Therefore, the purpose of this study is to verify the effects and relationships of entrepreneurship and dynamic competence of business startups on management performance. For this study, a survey was conducted on CEOs of start-up companies less than seven years old, and 361 final samples were used to analyze data. The results of this study are as follows. The innovation, risk-taking and initiative of entrepreneurship were found to have a positive effect on dynamic capabilities. Second, the innovation and risk-taking of entrepreneurship had a significant positive effect on management performance, but initiative was found to have no significant effect. Third, it was found that dynamic capabilities had a significant positive effect on management performance. Lastly, the verification of the mediated effect of dynamic capabilities showed that there was a mediated effect between initiative and management performance. In other words, this study found a significant research result that effective management of the resources of a start-up company had an effect on management performance and growth when forwardness did not directly affect management performance. This suggests that dynamic capabilities are an important factor in the management performance of start-up companies.

• Korean Journal of Breeding Science
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• v.50 no.4
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• pp.434-441
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• 2018

High-density genetic linkage mapping is critical for undertaking marker-assisted selection and confirming quantitative trait loci, as well as helping to build pseudomolecules of genomes. We constructed a genetic map using 94 $F_1$ populations generated from the interspecific cross between Korean cultivar "Wonwhang" (Pyrus pyrifolia, NCBI BioSample SAMN05196235) and European cultivar "Bartlett" (Pyrus communis). We designed a total of 24,267 SSR markers based on the genome sequences of "Wonwhang" for this. To select the markers that are linked to the traits important in pear breeding programs, SSR-containing genomic sequences were subjected to nucleotide sequence homology searches, which resulted in 510 SSR markers with high similarity to genes encoding proteins with putative functions such as transcription factors, resistance proteins, flowering time, and regulatory genes. Of these, 70 markers showed polymorphisms in parents and segregating populations and were used to construct a genetic linkage map, together with the unpublished 579 SNPs obtained from genotyping by sequencing analysis. The genetic linkage map covered 3,784.2 cM and the average distance between adjacent markers was 5.8 cM. Seventy SSR markers were distributed across 17 chromosomes with more than one locus.