• 한국전자통신학회논문지
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• 제2권1호
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• pp.46-51
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• 2007

무선 환경에서 P2P 환경에서의 파일 공유 방식은 클라이언트/서버 방식과는 다르게 값비싼 서버를 사용하지 않고 클라이언트 컴퓨터들만을 사용하여 자료의 공유 및 관리를 분산시킨다. 이러한 이유로 대용량의 서버를 사용하는 클라이언트/서버 방식에서 발생하는 인적, 물적 자원의 낭비를 최소화 할 수 있다. 또한 사용자의 수가 늘어날수록 연산, 협업의 성과가 높아지는 등의 혜택을 제공한다. 이와 같은 이유로 인해 많은 사람들이 P2P에 관심을 갖고, 또한 현재 각광받고 있는 모바일 관련 분야에도 P2P를 이용한 연구들이 활발하게 진행되고 있다.

• 한국융합학회논문지
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• 제12권12호
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• pp.401-409
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• 2021

이 연구는 천안시 태조산의 산림 경사 트레킹 시 80bpm 및 130+30bpm의 속도로 걷기 운동 후 정적회복 및 동적회복방법이 회복 중 심박수, 혈중젖산농도, 혈중글루코스에 미치는 영향을 분석하여 산림환경의 경사 트레킹 후 효율적인 회복방법을 알아보고자 하였다. 걷기 운동을 하는데 이상이 없는 20-30대 남자 9명을 대상으로 80bpm 속도와 130+30bpm 속도로 트레킹 후 정적회복방법과 동적회복방법에 따라 얻은 결과를 이원 반복측정 분산분석(Two-way repeated ANOVA)방법으로 분석하였으며, 유의한 차이가 나는 경우 contrast의 repeated 방법을 적용하여 비교 분석하였다. 80bpm 조건에서의 심박수는 방법(p=.008)과 시기(p=.000)에 따라 유의한 차이가 있었으며, 혈중젖산농도는 회복방법에 따라 유의한 차이가 없었으나(p=.401), 시기에 따라 유의한 차이가 나타났다(p=.000). 혈중글루코스는 회복방법에 따라 유의한 차이가 나타나지 않았으며(p=.093), 정적회복방법의 시기에서 유의한 차이가 나타났다(p=.002). 130bpm+30bpm 조건에서의 심박수는 방법(p=.002)과 시기(p=.000)에 따라 유의한 차이가 있었으며, 혈중젖산농도는 방법(p=.001)과 시기(p=.000)에 따라 유의한 차이가 나타났고, 혈중글루코스농도는 방법(p=.721)과 시기(p=090)간 유의한 차이가 나타나지 않았다.

• 산업융합연구
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• 제6권1호
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• pp.57-72
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• 2008

In this study, general outline of P2P(peer to peer) application was analyzed dealing with security attacks and threats on the P2P environment. Information security service was studied to provide secure P2P service under the information threats. This study proposes two methods to provide secure information security service. One is a method to use personal firewall software on the peer. The other is a method to use key distribution protocol for confidentiality and integrity.

• 한국농공학회지
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• 제44권6호
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• pp.106-114
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• 2002

In this study, the results of a series of consolidation test for undisturbed Ariake clay in Japan were analyzed by three methods, e-log p (e: void ratio, p: consolidation pressure), log e-log p and n-log p (n: porosity). Moreover, the characteristics of each analysis method were studied. For undisturbed Ariake clay, the log o-Log p and the n-log p relationships can be found as two groups of straight lines of different gradients, but both the elastic consolidation and plastic consolidation regions of e-log p relationship are expressed as a curve. In this paper, the porosity of consolidation yield n$\_$y/, consolidation yield stress p$\_$y/, and the gradient of the plastic consolidation region C$\_$p/ were represented by the log e-log p method, and n$\_$c/, P$\_$cn/ and C$\_$cn/ were represented by the n-log p method. The meaning and the relationships of each value were studied, and the interrelationships among compression indices i.e. C$\_$cn/, C$\_$p/ and C$\_$c/ are obtained from each analysis method as a function of initial porosity n$\_$0/.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2009년도 춘계학술발표대회
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• pp.29.1-29.1
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• 2009

Fabrication of good quality P-type GaN remained as a challenge for many years which hindered the III-V nitrides from yielding visible light emitting devices. Firstly Amano et al succeeded in obtaining P-type GaN films using Mg doping and post Low Energy Electron Beam Irradiation (LEEBI) treatment. However only few region of the P-GaN was activated by LEEBI treatment. Later Nakamura et al succeeded in producing good quality P-GaN by thermal annealing method in which the as deposited P-GaN samples were annealed in N2 ambient at temperatures above $600^{\circ}C$. The carrier concentration of N type and P-type GaN differs by one order which have a major effect in AlGaN based deep UV-LED fabrication. So increasing the P-type GaN concentration becomes necessary. In this study we have proposed a novel method of activating P-type GaN by electrochemical potentiostatic method. Hydrogen bond in the Mg-H complexes of the P-type GaN is removed by electrochemical reaction using KOH solution as an electrolyte solution. Full structure LED sample grown by MOCVD serves as anode and platinum electrode serves as cathode. Experiments are performed by varying KOH concentration, process time and applied voltage. Secondary Ion Mass Spectroscopy (SIMS) analysis is performed to determine the hydrogen concentration in the P-GaN sample activated by annealing and electrochemical method. Results suggest that the hydrogen concentration is lesser in P-GaN sample activated by electrochemical method than conventional annealing method. The output power of the LED is also enhanced for full structure samples with electrochemical activated P-GaN. Thus we propose an efficient method for P-GaN activation by electrochemical reaction. 30% improvement in light output is obtained by electrochemical activation method.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권11호
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• pp.471-474
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• 2013

본 논문에서는 효율적인 peer-to-peer(P2P) 네트워크의 토폴로지 구축을 위해 참여 피어의 용양과 데이터 소스까지의 홉 수를 고려한 분산적 부모 피어 선택 기법을 제안한다. 이를 위해 우선 각 피어가 부모 피어로 선정될 확률을 결정하기 위해 피어의 용양과 거리를 결합하는 방안을 제시하고 각 피어가 분산적으로 관리하는 이웃피어의 상태 정보를 이용하여 확률적으로 부모 피어를 선택하는 방안을 제시한다. 모의실험을 통해 제안 기법은 용양이 큰 피어가 보다 많은 자식 피어들을 지원하게 함으로써 타 기법들에 비해 동일 환경에서 P2P 네트워크의 지름과 네트워크 구성의 효율성 측면에서 우수함을 정량적으로 검증하였다.

• 한국동물위생학회지
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• 제20권3호
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• pp.313-321
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• 1997

The antibiotic residues of the urine, the liver, the lung, the kidney and the spleen in slaughtered pigs at Kyongbuk province were detected by TLC(505 kit) and EEC-4 plate method. 1. The positive rate of residual sulfamethazine which was detected by 505 kit in the urine (n=200) was 0.0%. 2. The positive rate of residual sulfamethazine which was detected by EEC-4 plate in the urine (n=126), the liver(n=98), the kidney(n=72), the spleen (n=68) and the lung(n=48) were 63%, 49%, 36%, 34% and 24%, respectively. 3. By EEC-4 plate method, the positive detection rates of the urine were 53.0% in BS(pH 6.0), 29.0% in BS(pH 7.2), 11.5% in BS(pH 8.0) and 13.0% in ML(pH 8.0) medium, that of the liver 41.5% in BS(pH 6.0), 22.0% in BS(pH 7.2), 6.5% in BS(pH 8.0) and 5.0%, in ML (pH 8.0) medium, that of the lung 21.0% in BS(pH 6.0), 9.5%, in BS(pH 7.2) and 8.5% in BS(pH 8.0) medium, and that of the kidney 31.5% in BS(pH 6.0), 14.5% in BS(pH 7.2), 20.0% in BS(pH 8.0) and 3.0% in ML(pH 8.0) medium. In the spleen, only in BS(pH 6.0) medium the positive rate was detected as 33.5 %. 4. The positive rates of samples which shown TLC-positive detected by EEC-4 plate method were 53.9% in no band, 77.8% in one band, 80.9% in two bands, 66.7% in three bands, respectively. In conclusion, the EEC-4 plate method could be applied for the detection of residual antibiotics in samples which shown as out of standard Rf values by TLC-method (SOS kit).

• Restorative Dentistry and Endodontics
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• 제21권1호
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• pp.1-18
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• 1996

There are many advantages when using IIF and DNA probe methods over anaerobic culture method in that they are time-and effort-saving, more precise and more sensitive. Furthermore, in IIF and DNA probe methods, the detection is possible only with small amount of bacteria, the quantitative analysis is possible, and the cell viability is not necessary. The purpose of this study is to observe the incidence of P.endodontalis by carrying out anaerobic culture, IIF and colony lift using DNA probe method respectively, and to compare these 3 methods in terms of effectiveness and sensitivity in order to identify the most effective detection method. 30 teeth with at least one clinical symptoms, with single canal, and with pulp necrosis were sampled. For sampling bacteria, access cavity was prepared after disinfecting tooth and its surroundings. Then the paper point was inserted up to the periapical area, leave there for a while, and finally it was placed into PRAS Ringer's sol. and PBS sol. In anaerobic culture method, P.endodontalis was identified by biochemical tests after subculturing black and brown colonies which were produced after 7 days of incubation on BAP and Brucella BAP in anaerobic chamber. To identify P.endodontalis in IIF method, species-specific polyclonal rabbit-antisera of P.endodontalis(ATCC 35406) was reacted with sampled PBS sol. dispensed onto glass slide, and then P.endodontalis was examined by phase contrast microscopy after incubating with Goat anti-rabbit lgG conjugated to Fluorescein isothiocyanate. For colony lift using DNA probe method, membranes were laid over colonies on the surface of BAP and were hybridized with cloned DNA probe of P.endodontalis. The existence of P.endodontalis was then identified by the methods of chemiluminescent detection and color metric detection. Black colony was found in 11 teeth out of 30 teeth and P.endodontalis was detected in 6 teeth (20 %) by anaerobic culture method, 16 teeth (53 %) by IIF method, and 7 teeth (23 %) by DNA probe method. IIF method is significantly better in detecting P.endodontalis than DNA probe method and anaerobic culture method. There was no significant differences between DNA probe method and anaerobic culture method. There was significant correlation between the formation of black colony and the existence of P.endodontalis. The probability of detecting P.endodontalis when black colony being present is 2.89 times higher than when not being present. There was significant relationship between the foul odor of clinical symptoms and P.endodontalis. The sensitivity of existing P.endodontalis when foul odor being present was 93.75 %, while the specificity of not existing P.endodontalis when foul odor not being present was 28.57 %. These results suggested that the probes of P.endodontalis will be used to decide the method and prognosis in endodontic treatments.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.345-350
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• 2000

Adaptive finite element analysis, which its solution error meets with the user defined allowable error, is recently used far improving reliability of finite element analysis results. This adaptive analysis is composed of two procedures; one is the error estimation of an analysis result and another is the reconstruction of finite elements. In the rp-method, an element size is controlled by relocating of nodal positions(r-method) and the order of an element shape function is determined by the hierarchical polynomial(p-method) corresponding to the element solution error. In order to show the effectiveness and accuracy of the suggested rp-method, various numerical examples were analyzed and these analysis results were examined by comparing with those obtained by the existed methods. As a result of this study, following conclusions are obtained. (1) rp-method is more accurate and effective than the r- and p-method. (2) The solution convergency of the rp-method is controlled by means of the iterative calculation numbers of the r- and p- method each other.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.1129-1134
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• 2001

In the point of the Eco-concrete(Environmentally Friendly Concrete), it is very important to reduce the pH of high porous concrete by the pH to be able to grow plants, because the pH of concrete is l1~13. But the method of measuring the pH of high porous concrete is not well-defined, yet. Therefore, first, this paper report the method of measuring the pH of high porous concrete. Secondly this paper reports the pH reduction of high porous concrete to grow plants.