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김종민,김민수,김귀남,Kim, JongMin,Kim, MinSu,Kim, Kuinam J. 한국융합보안학회 2014 융합보안 논문지 Vol.14 No.5
A Trojan malicious code is one of largest malicious codes and has been known as a virus that causes damage to a system as itself. However, it has been changed as a type that picks user information out stealthily through a backdoor method, and worms or viruses, which represent a characteristic of the Trojan malicious code, have recently been increased. Although several modeling methods for analyzing the diffusion characteristics of worms have proposed, it allows a macroscopic analysis only and shows limitations in estimating specific viruses and malicious codes. Thus, in this study an ESP model that can estimate future occurrences of Trojan malicious codes using the previous Trojan data is proposed. It is verified that the estimated value obtained using the proposed model is similar to the existing actual frequency in causes of the comparison between the obtained value and the result obtained by the Markov chain. 악성코드 중 가장 많은 비율을 차지한 것은 트로이 목마이며, 트로이 목마의 경우 그 자체로 피해를 주는 형태가 주종을 이루었지만, 최근에는 백도어 방식으로 사용자 정보를 몰래 빼오는 형태가 많아지고 있으며, 트로이 목마의 특성을 갖고 있는 웜이나 바이러스가 증가하고 있는 추세이다. 웜의 확산 특징을 분석하기 위한 모델링 기법들이 제시되었지만 거시적인 분석만 가능하였고 특정 바이러스, 악성코드에 대해 예측하기는 한계점이 있다. 따라서 본 논문에서는 과거의 Trojan 데이터를 활용하여 미래의 Trojan 악성코드의 발생을 예측 할 수 있는 ESP모델을 제시하였다. 이 모델을 적용하여 얻어진 예측 값을 마코프 체인과 비교한 결과 제안한 모델이 기존 발생한 실제 빈도수와 유사한 값을 나타냄을 알 수 있었다.
김종민(J. M. Kim),박정배(J. B. Park),김주일(J. I. Kim),천민우(M. W. Chun),김바다(B. D. Kim),김주호(J. H. Kim),이정호(J. H. Lee),이충근(C. G. Lee),이대엽(D. Y. Lee) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
In order to develop a HST rear wheel auxiliary drive, which can be selectively used depending on work environment, a feasibility of HST with driving and steering function was studied for a 3.5 ton class forklift. For accurate control of HST, steering angle and revolutions were precisely measured with potentiometers and encoders, respectively. And the wheel load was measured using load cell to obtain the required power output of the rear wheel. This help accurately control the number of revolutions when make a turn. In order to minimize the decrease of fuel consumption due to the installation of HST, hydraulic energy was regenerated and analytical study using SimulationX was performed for optimization. Also, a standard test cycle to evaluate an improvement of fuel economy by energy regeneration was developed and applied to this study.
천공유압드릴 장비에서 작업 동작에 따른 연비 측정 및 평가 기술 연구
최진구(J. G. Choi),강주영(J. Y. Kang),김종민(J. M. Kim),배종원(J. W. Bae),이충근(C. G. Lee),이정호(J. H. Lee),김주호(J. H. Kim),이대엽(D. Y. Lee),송윤우(Y. W. Song),김명보(M. B. Kim),조재상(J. S. Cho) 유공압건설기계학회 2017 유공압건설기계학회 학술대회논문집 Vol.2017 No.11
In order to improve the fuel economy of a hydraulic drilling machine, which consumes relatively large amount of fuel compared to other typical construction machinery, a comparison is made between gravimetric fuel consumption using mass flowmeter and CAN signal. And, since the data of CAN signal is close enough to the measured data of a flowmeter, fuel consumption at real work mode is measured and analyzed using CAN signals. A result show that drilling mode occupies about 67.4% of total fuel consumption. It is concluded that this work may contribute to enhance fuel economy of hydraulic drilling machines.
J. S. Kong(공정식),K. Min(민경현),J. Kim(김종민),J. Kim(김지수),G. Gao(가오그),H. Park(박효신),H. H. Han(한현호),D.-W. Cho(조동우) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
To treat peripheral nerve deficits, a variety of synthetic and decellularized materials with anisotropic architectures are developed due to the advantages proposed by aligned structures with respect to cell activity, migration, and directionality. Additionally, narrowing microscale topological cue has advantages on alignment and migration of cells. However, up to date, fabricating 3D hydrogel constructs composed of thin microfibers under 50 μm using mechanically weak hydrogel like low concentrated dECM bioink is challenge, unlike synthetic polymer-based fabrication. In this study, we created a microgel printing bath solution to three-dimensionally print a dECM bioink, derived from porcine nerve, as a thin microfiber. A 30 μm filament resolution of low viscosity dECM hydrogel with a neutral pH was achieved using an alginate microgel supplemented printing bath. To treat the sciatic nerve defect model of rats, 3D printed cylindrical constructs retaining bundle of dECM microfibers were used as a filler of the polycaprolacton (PCL) conduit. The total number of regenerated axons and relative gastrocnemius muscle weight ratio were comparable to those of the autologous nerve graft group. Meanwhile, the results were superior to those of the porcine decellularized nerve tissue group or the 3D printed filler only group.
J. Kim(김지수),J. Jang(장진아),J. Kim(김종민),G. Ge(그가오),J. Won(원재연),D.-W. Cho(조동우) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
The clinical therapy for retinal vascular diseases requires repeated intravitreal injections of anti-vascular endothelial growth factors due to their short half-life, which imposes burdens such as endophthalmitis and hemorrhage for patients. Therefore, the improvement of drug delivery system is necessary to prolong the drug activity and minimize secondary complications. In this study, we used co-axial printing technique to develop a core/shell drug-loaded rod (Drug Rod) which could deliver dual types of drugs (Bevacizumab (BEV) and Dexamethasone (DEX)) from the same implant. The drug rod can achieve sustained and burst release kinetics of BEV and DEX, respectively, under both the in vitro and in vivo conditions. The versatility of coaxial printing technique facilitates to produce the drug rod with various dosages and dimensions that can be implanted in the vitreous using small gauge of the needle less-invasively. We validated the superiority of the implanted drug rod by using rat laser-induced choroidal neovascularization models for inhibiting inflammatory responses and long-term suppressing neovascularization compared to the conventional intravitreal injection of BEV. These results suggested that the drug rod could be an alternative therapeutic approach for the treatment of various types of retinal vascular diseases including AMD.
Development of Vascularized Outer Blood-retinal-barrier Model via 3D Cell Printing
J. Kim(김종민),J. S. Kong(공정식),J. Y. Won(원재연),D-.W. Cho(조동우) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
The outer blood-retinal-barrier (oBRB) is formed by tight junction of retinal pigment epithelium (RPE) and controls the molecular transportation between choroid and retina. Moreover, the RPE plays a multifunctional role in ocular system, including clearance, visual and maintenance functions. Due to their crucial role, the loss of this epithelium causes a wide range of the disease related to retinal degeneration such as age-related macular degeneration. Unfortunately, currently, there is no cure for most of these diseases since there is no suitable testing platform. To overcome this limitation, we developed the 3D printed vascularized oBRB model. For this objective, we developed Bruch’s membrane derived bioink (BM-ECM), containing natural extracellular matrix (ECM). Using BM-ECM and 3D printing technology, the Bruch’s membrane mimetic substrate (BMMS) was developed to recapitulate the structural and ECM micro environment for RPE. Then, HUVEC and RPE cells were printed in both side of BMMS to from vascularized oBRB and confirmed their superiorities.