• 한국컴퓨터정보학회논문지
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• 제27권12호
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• pp.179-188
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• 2022

본 논문에서는 효율적이고 절차적인 소프트웨어 패치 절차를 제안하였다. 매년 조직에서는 수만 개의 알려진 취약점이 존재하고 패치 작업에 수만 시간과 수백만 달러 이상을 소비한다. 이러한 노력에도 불구하고 주어진 패치된 취약점에 대한 익스플로잇이 나타나는 데 걸리는 시간이 단축되고 있는 것으로 조사되었다. 기업, 대학 등 다양한 형태의 조직에서 일관되지 않는 방법으로 패치를 관리함에 따라 보안 문제 발생, 시스템 불안정, 패치로 인한 정보 유출 및 작업지연 등의 문제가 발생하고 있다. 본 연구에서는 소프트웨어 패치 관리를 위해 필요한 기본적인 사항들을 살펴보고 패치 관리를 위해 고려되어야 하는 사항과 패치 관리를 위한 효율적인 단계를 정의한다. 따라서 본 연구는 소프트웨어 기능의 수정, 보안 취약점에 대한 해결 방법으로 조직 내의 소프트웨어를 새로운 버전으로 갱신하고 패치하는 과정에서 조직의 패치 관리 정책을 효율적이고 절차적으로 실행하는 방안으로 활용될 것이다.

• 대한기계학회논문집A
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• 제25권12호
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• pp.2070-2077
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• 2001

An experimental investigation of the effect of composite patching repair was conducted to characterize the fatigue crack growth behavior in thick A16061-T6 (6mm) panels with single bonded patch by fiber reinforced composite patch. Four patch lengths and no patch plate were examined. An analytical procedure, involving three-dimensional finite element method having three layers to model cracked aluminum plate, epoxy by adhesive and composite Patch, is calculated the stress intensity factors. From the calculated stress intensity factors, the fatigue crack growth rates are obtained. At the single patching type, different fatigue crack growth ratios through the palate thickness were investigated by using the experimental and analytical results. The results demonstrated that there was a definite variation in fatigue life depending on the size of composite patch. While crack reached the patch end, retardation of crack growth was also revealed in the bonded repair.

• The Korean Journal of Pain
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• 제13권1호
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• pp.79-83
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• 2000

Background: Spontaneous intracranial hypotension is a syndrome characterized by postural headache without trauma, spinal anesthesia or other medical history. The purpose of this study is to analyze the effect of epidural blood patch in spontaneous intracranial hypotension. Methods: The spontaneous intracranial hypotension patients treated with epidural blood patch were analyzed on the symptoms, radiologic images and methods of epidural blood patch retrospectively by the medical records. Results: Patients had postural headache (15 patients) including nausea/vomiting (10 patients), tinnitus (2 patients), neck stiffness (13 patients), vertigo (3 patients) and occular pain (1 patient). Brain CT and MRI showed diffuse enhancement of the pachymeninges (9 patients) and radionuclide cisternography demonstrated direct evidence of leakage (11 patients). With epidural blood patch, the symptoms were promptly relieved in 11 patients. Conclusions: We concluded that epidural blood patch is a good treatment of method in spontaneous intracranial hypotension patients.

• 한국산업정보학회논문지
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• 제19권1호
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• pp.43-52
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• 2014

P-wave characteristic in the human electrocardiogram (ECG) is important in the diagnosis of atrial conduction pathology. In this paper, we measured an ECG signal from patient with cardiovascular disease using one lead ECG electrode system which is based on the wireless cardiac monitoring system. And we detected a P-wave in ECG signal using the complex-valued continuous wavelet transforms (CWT) according to two kinds of patch type electrodes such as an existing narrow patch type electrode and the improved wide patch type electrode presented in this paper. Also, we compared the characteristics in detecting the P-wave in terms of the magnitude and the width of P-waves. From the results of comparison we found that the width and the magnitude of P-wave detected using the wide patch type electrode is improved to be interpreted easier compared to those using the narrow patch type electrode. Furthermore, we have also proven that the complex-valued CWT can be used as a robust detector for P-wave in ECG signal analysis.

• 한국산학기술학회논문지
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• 제10권10호
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• pp.2615-2618
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• 2009

본 논문에서는 WLAN 11 a/b/g 대역(2.4 GHz/5.5 GHz)용 4개의 브릿지(bridge)를 가진 이중 사각 패치(double rectangular patch) 안테나를 소개 하였다. 5.5 GHz 주파수 대역용 평면형 사각 패치는 이중 대역동작을 위해 2.4 GHz에서 동작하는 외부 사각 패치와 4개의 인덕티브 브릿지(inductive bridge)를 통해 연결되어 있다. 제안된 안테나는 4개의 인덕티브 브릿지의 넓이를 가변 하여 사용 주파수 대역을 튜닝 할 수 있으며, 안테나의 최대 이득은 5.5 GHz 주파수 대역에서 3.7 dBi 이고 2.4 GHz 주파수 대역에서는 5 dBi이다.

• 전자공학회논문지
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• 제52권2호
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• pp.55-69
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• 2015

근접 결합 급전 방식을 이용한 마이크로스트립 패치 안테나의 급전 선로에 임피던스 정합기를 집적하여 대역폭을 확장하는 방법에 대하여 연구하였다. 여러 가지 유전상수와 두께를 가지는 기판을 사용한 근접 결합 급전을 이용한 패치 안테나에 임피던스 정합기를 집적한 경우와 임피던스 정합기를 사용하지 않은 경우의 대역폭과 방사특성을 비교하였다. 임피던스 정합기를 사용한 경우가 사용하지 않은 경우에 비하여 방사특성의 저하 없이 대역폭이 크게 증가함을 볼 수 있었다.

• Journal of information and communication convergence engineering
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• 제18권3호
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• pp.162-166
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• 2020

The present paper presents an array antenna of a microstrip patch for 5G applications. Four rectangular microstrip patch elements are arranged in parallel and series to form an array antenna. Two insets are made on both sides of each patch element to achieve a wide frequency bandwidth of 23.97-31.60 GHz. To attain a high gain and wider bandwidth, the microstrip patch antenna is fed using series and corporate feeding networks. Further, three director elements on top of the top-most patch elements, and one reflector element at the open end of each patch element, are added. The addition of the Yagi elements improved the overall gain and acquired a higher radiation efficiency throughout the operating frequency bandwidth, with the array antenna achieving a maximum peak gain of 8.7 dB. The proposed antenna is built on a low-loss and low-cost substrate of FR4-eproxy. The proposed antenna design with a simple structure is suitable for Internet of Things and 5G applications.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.292-298
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• 2001

An experimental investigation of the effect of composite patching repair was conducted to characterize the fatigue crack growth behavior in thick A16061-T6 (6mm) panels with single bonded patch by fiber reinforced composite patch. Four patch lengths and no patch plate were examined. An analytical procedure, involving three-dimensional finite element method having three layers to model cracked aluminum plate, epoxy by adhesive and composite patch, is calculated the stress intensity factors. From the calculated stress intensity factors, the fatigue crack growth rates are obtained. At the single patching type, different fatigue crack growth ratios through the plate thickness were investigated by using the experimental and analytical results. The results demonstrated that there was a definite variation in fatigue life depending on the size of composite patch. While crack reached the patch end, retardation of crack growth was also revealed in the bonded repair.

• 대한기계학회논문집A
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• 제24권8호
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• pp.2000-2006
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• 2000

The enhancement of service life of damaged or cracked structures is currently major issue to the researchers and engineers. In order to improve the life of cracked aging aircraft structures, the repair technique which uses adhesively bonded boron/epoxy composite patches is being widely considered as a cost-effective and reliable method. This paper is to study the performance of the bonded composite patch repair of a plate containing an inclined central through-crack. A 3-dimensional finite element method having three layers to the cracked plate, composite patch and adhesive layer, is used to compute the stress intensity factor. In this paper, the reduction of stress intensity factors near the crack-tip are determined to evaluate the effects of various non-dimensional design parameter including composite patch thickness, and material properties of the composite patch and thickness of the adhesive layer, materials of patch etc., and the crack length, Finally, The problem of how to optimize the patch geometric configurations has been discussed.

• International Journal of Precision Engineering and Manufacturing
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• 제1권2호
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• pp.55-60
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• 2000

A comparison of Riveted and bonded repairs, bearing and net tension failures, and Al 6061-T6 plates is presented. The results are then compared with previous papers about bonded repairs on different patch materials and shapes. Aluminum alloys, including Al 6061-T6, have a face-centered-cubic crystal structure. Under normal circumstances, these types of crystal structures do not exhibit cleavage fractures even at very low temperatures. In aluminum-base structures, the cracked plate structures are frequently repaired using mechanical fasteners-either rivets of bolts- even though patch-bonding techniques are applied to repair and reinforce the structure. Static test results indicate that the riveted repairs are affected by the position of the rivers. When using the same size of patch, the bonded repair technique is stronger; the rate of elongation is also increased. Form FEM analysis, it is revealed the origin of patch debonding in patch-bonded structures is the edge of the patch along to the tensile strength.