현장 대응용 리눅스 기반 서버 정보 식별 및 데이터 수집 시스템

최근철,이상진,박정흠 한국디지털포렌식학회 2022 디지털 포렌식 연구 Vol.16 No.4

사이버 도박이나 저작권 침해 사이트와 같이 인터넷 서비스를 이용하는 범죄에 웹 서비스 시스템이 사용되고 있다. 따라서, 웹 서비스 시스템에 대한 디지털포렌식이 필요하다. 현장에서 디지털 증거 압수 시 범죄 관련 증거가 모여 있는 데이터베이스 서버에서 디지털 증거를 선별 압수할 필요가 있다. 리눅스 기반의 웹 서비스 시스템에서 디지털 증거를 선별 압수하기 위해서는 리눅스 시스템과 웹 서비스 시스템에 대한 이해가 필요하다. 현장에서 선별 압수를 진행해야 하는 수사관들에게 필요한 도구가 제공되지 않아 디스크의 복제본을 획득하여 복제본 반출을 진행하고 있다. 현장에서 리눅스 기반 웹 서비스 시스템에서 범죄사실과 관련성 있는 디지털 증거를 확보하기 위한 분석 방법 및 프레임워크를 제안한다. 제안된 프레임워크를 바탕으로 데이터를 수집하는 도구를 개발하여 제공한다.

석탄밀 B/F 분산판 및 입구덕트 개조로 B/F효율 향상

최근철,우태건,이용남,백종섭 한국시멘트협회 2000 시멘트 심포지움 Vol.27 No.-

豆芽組織의 ADP-ribosyl Transferase에 關한 硏究

崔根哲,金康信,金炯魯 전북대학교 의과학연구소 1985 全北醫大論文集 Vol.9 No.2

ADP-ribosyl transferase, which catalyzes the transfer of ADP-ribose moiety of NAD to acceptor portein, has been reported only in bacteria nad animal tissues but not in plant tissues. The enzyme activity in soybean hypocotyl was demonstrated only in nuclear fraction, showing similar distribution with poly (ADP-ribose) synthetase of animal tissues. The growth curve of soybean hypocotyl showed the ideal sigmoid shape with maximal growth rate between 4 and 6 days. And the maximal activity of this enzyme was demonstrated at about 2cm fraction from the distal tip of soybean hpocotyl, where the growth and differentiation were most active. The enzyme activities in these fractions showed gradual increase with development and reached the maximum at 6th day. ADP-ribosyl transferase of soybean hypocotyl was very unstable, exhibiting only 30% of initial activity after 4 days storage at 4℃, but stabilized by the addition of MgCl₂. Inhibitors of poly (ADP-ribose) synthetase such as nicotinamide and benzamide showed little inhibitory effect on the enzyme activity, comparing with a profound inhibition of LaCl₃ and hgCl₂.

피마자유와 양명아주 추출물을 원료로 하는 유기농업자재 유효성분의 열 안정성 평가

최근형 ( Geun-hyoung Choi ),정동규 ( Dong-kyu Jeong ),진초롱 ( Cho-long Jin ),노진호 ( Jin-ho Rho ),박병준 ( Byung-jun Park ),문병철 ( Byung-cheol Moon ),김진효 ( Jin-hyo Kim ) 한국환경농학회 2017 한국환경농학회지 Vol.36 No.1

BACKGROUND: Castor oil and wormseed extract are important active ingredients for biopesticide, and ricinoleic acid in castor oil and three monoterpenes (ascaridole, carvacrol and p-cymene) in wormseed extract are known bioactive substances. However, their stabilities had not been studied, even though the stability was the core property for estimation of shelf-life of biopesticide. Aimed to investigate the thermal stabilities of the bioactive substances in castor oil and wormseed extracts. METHODS AND RESULTS: The contents of ricinoleic acid and three monoterpenes (ascaridole, carvacrol and p-cymene) were analyzed by gas chromatography (GC). The thermal stabilities of the bioactive substance were measured at 0℃, 23℃, 30℃, 40℃, 45℃and 54℃for 84 d. The half-lives of ricinoleic acid in biopesticides was ranged from 28.9 d to 57.8 d at 30℃, and the stability of pure castor oil were located in the range (t_1/2=46.2 d for Indian product and 27.7 d for Korean product) at the same temperature. The half-lives of the total monoterpenes in biopesticides were ranged from 3.9 d to 27.7 d at 30℃. Among the monoterpenes, the stability ascaridole and p-cymene were decreased in acidic condition. All the bioactive substances showed similar stability on the different thermal conditions. CONCLUSION: The half-lives of most bioactive substance from castor oil and wormseed extracts were less than 100 d. To increase the stability of bioactive substance in biopesticide, stabilizing additives like antioxidant and oxygen remover should be considered to extend of the shelf-life.

수도작 작물의 과불소화합물 흡수이행성

최근형,이득영,배지연,노진호,문병철,김진효 한국응용생명화학회 2018 Journal of Applied Biological Chemistry (J. Appl. Vol.61 No.2

국내 주요 식량작물인 벼에서의 잔류성 유기오염물질 잔류평가는 인체 위해성 평가에서 매우 중요하다. 본 연구에서는 과불소화합물 중 perfluorooctanoic acid (PFOA)와 perfluorooctane sulfonic acid (PFOS)의 잔류평가를 벼의 부위별 흡수이행성을조사하여 수행하였다. 벼는 저농도 오염처리구(1 mg kg−1)와 고농도 오염처리구(5 mg kg−1)에서 재배 후 현미, 왕겨, 볏짚으로나누어 잔류량을 조사하였고, 시험결과 현미의 과불소화합물 흡수이행성(0.002-0.006)이 다른 부위에 비해 가장 낮은 것으로 확인되었다. 잔류수준은 볏짚에서 가장 높게 나타났으며, 다음으로 왕겨와 현미 순이었고, 볏짚의 PFOA와 PFOS의 생물농축계수는 최대 1.474와 4.700으로 확인되었다. Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) are emerging pollutants in agricultural product, and the residual patterns and the uptake potentials were only studied on several crops, not on rice. The residue level and bioconcentration factor (BCF) of PFOA and PFOS were investigated on the low (1 mg kg-1) and the high contaminated soil (5 mg kg-1) groups. The residue levels in brown rice in the low group and in the high group were 0.002-0.004 and 0.008-0.030 mg kg-1 of the each perfluorinated compounds (PFCs), and in the rice husk were 0.035-0.074 mg kg-1 and 0.125-0.376 mg kg-1 of the each PFCs, respectively. Furthermore, the residues in rice straw were the highest level in the all rice parts both in the groups. The PFOA and PFOS were reached to 3.723 mg kg-1 and 7.641 mg kg-1, respectively, and the BCF (1.474 and 4.700) as well.

음식물쓰레기의 장기 혐기성소화 시 암모니아의 영향

최근형 ( Geun-hyung Choi ),김태형 ( Tae-hyung Kim ),이미애 ( Mi-ae Lee ),박완철 ( Wan-cheol Park ),조길영 ( Gil-young Cho ),박제철 ( Je-chul Park ) 한국환경기술학회 2008 한국환경기술학회지 Vol.9 No.4

본 연구에서는 음식물쓰레기의 장기 혐기성소화 시 독성으로 작용하는 암모니아의 영향에 대하여 조사하였다. 실험에 사용된 음식물쓰레기의 BOD₅ 및 CODcr 농도는 59,100mg/L 및 155,700mg/L였고, CODcr/BOD₅ 비는 2.7이었다. 운전결과, BOD₅ 및 CODcr 제거효율은 체류시간 80일에서 95.8% 및 87.0%를 보였다. 또한, 체류시간 80일의 경우 암모니아 농도가 3,500mg/L까지 높아졌음에도 혐기성 미생물에는 아무런 영향이 없는 것으로 보아 독성을 유발하는 한계농도도 높아진 것으로 판단된다. This study was conducted to analyze the effect of ammonia which causes a poisonous reaction with respect to the long-term anaerobic digestion for food waste. BOD₅ and CODcr concentrations of food waste in the experiment were 59,100mg/L and 155,700mg/L. The ratio of CODcr/BOD₅ was 2.7. As operation results, the removal efficiencies of BOD₅ and CODcr at 80 day retention time showed 95.8% and 87.0%, respectively. Also, extended acclimation period made the level of toxic limit concentration heighten such that with 80 day retention time, even 3,500mg/L of ammonia concentration does not affect to anaerobic microorganism.

Survey of Medical Applications of Federated Learning

최근호,차원철,이세욱,신수용 대한의료정보학회 2024 Healthcare Informatics Research Vol.30 No.1

Objectives: Medical artificial intelligence (AI) has recently attracted considerable attention. However, training medical AI models is challenging due to privacy-protection regulations. Among the proposed solutions, federated learning (FL) stands out. FL involves transmitting only model parameters without sharing the original data, making it particularly suitable for the medical field, where data privacy is paramount. This study reviews the application of FL in the medical domain. Methods: We conducted a literature search using the keywords "federated learning" in combination with "medical," "healthcare," or "clinical" on Google Scholar and PubMed. After reviewing titles and abstracts, 58 papers were selected for analysis. These FL studies were categorized based on the types of data used, the target disease, the use of open datasets, the local model of FL, and the neural network model. We also examined issues related to heterogeneity and security. Results: In the investigated FL studies, the most commonly used data type was image data, and the most studied target diseases were cancer and COVID-19. The majority of studies utilized open datasets. Furthermore, 72% of the FL articles addressed heterogeneity issues, while 50% discussed security concerns. Conclusions: FL in the medical domain appears to be in its early stages, with most research using open data and focusing on specific data types and diseases for performance verification purposes. Nonetheless, medical FL research is anticipated to be increasingly applied and to become a vital component of multi-institutional research.

Headspace 법을 사용한 유기농업자재 중 잔류 유기용매 분석

최근형(Geun Hyoung Choi),공승헌(Seung-Heon Kong),박병준(Byung-Jun Park),문병철(Byeong-Cheol Moon),김진효(Jin-Hyo Kim) 한국농약과학회 2016 농약과학회지 Vol.20 No.2

Volatile organic solvents are used to extract the bioactive materials from raw materials for environmentally-friendly farming materials (EFFM), but the solvent should not remain in EFFM for the safety reasons. Thus qualitative and quantitative analysis method for the solvents using Headspace-GC were evaluated. Water content depleted the detection ratio of hydrophilic solvents and disturbing the hydrophilic interaction with solvents by DMSO might be helped to increase the detection ratio (up to 715%). Surfactant concentration affected to the detection ratio (68.5-179.1%) while surfactant type was not deeply involved the solvent detection. On the other hand, matrix-matched calibration method was accepted the minimum requirements for the quantitative analysis of the solvents in EFFM.

토마토 복합내병성 자원들의 병저항성 마커 검정 결과

조명철(Myeong Cheoul Cho),김정호(J.H. Kim),김수(S. Kim),양은영(E.Y. Yang),채수영(S.Y. Chae),박태성(T.S. Park),문지혜(J.H. Moon),최학순(H.S. Choi),최근진(G.J. Choi) 한국원예학회 2015 한국원예학회 학술발표요지 Vol.2015 No.10

수도작 작물의 토양 잔류 Endosulfan 흡수 이행성

최근형(Geun-Hyoung Choi),이득영(Deuk-Yeong Lee),류송희(Song-Hee Ryu),노진호,박병준(Byung-Jun Park),문병철(Byung-Cheol Moon),김진효(Jin-Hyo Kim) 한국농약과학회 2018 농약과학회지 Vol.22 No.1

Endosulfan has not allowed to use in agriculture since 2012 in South Korea, but the residue issue in crop is not solved due to the long half-life of endosulfan in environment. In this study, the plant uptake of endosulfan was investigated from soil to rice through the calculation of bioconcentrate factor (BCF). The plant uptake experiments were designed on the two different endosulfan concentrations (3 and 10 mg kg<SUP>−1</SUP>) in the soil, and endosulfan was quantified by GC-ECD analysis. From the experiments, only endosulfan was detected in the rice straw (0.546 and 1.258 mg kg<SUP>−1</SUP> as total endosulfan in the low and the high contaminated soil), but not in brown rice. Thus, the BCF was calculated to 0.125-0.188 in rice straw, and below 0.0001 in brown rice. Additionally, endosulfan sulfate was the main contributor to total endosulfan residue in rice straw.