하천환경사업의 현재와 전망

김규호,Kim, Gyu-Ho 한국수자원학회 2013 물과 미래(한국수자원학회지) Vol.46 No.8

조력발전 기술 및 현황

김규호,권석기,김태훈,Kim Gyu-Ho,Gwon Seok-Gi,Kim Tae-Hun 대한전기학회 2006 전기의 세계 Vol.55 No.8

고성능 패킷 분류를 위한 TCAM 분할

김규호,강석민,송일섭,권택근,Kim Kyu-Ho,Kang Seok-Min,Song Il-Seop,Kwon Teack-Geun 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.2B

네트워크 대역폭 증가에 따라 다양한 서비스의 등장과 함께 네트워크 위협이 꾸준히 증가하고 있다. 고성능 네트워크 보안의 실현을 위해, TCAM 등의 하드웨어를 통한 고속 네트워크에서의 빠른 패킷 분류 방법이 일반적으로 사용된다. 이러한 디바이스는 상대적으로 가격이 비싸고 용량이 충분치 않기 때문에 효율적으로 사용하기 위한 방법이 필요하다. 본 논문에서는 대표적인 침입탐지시스템인 Snort의 규칙집합을 이용하여 고속의 패킷 분류에 적합한 디바이스인 TCAM을 통한 효율적인 패킷 분류방법을 제안하였다. 제안한 방법에서는 값비싼 TCAM의 효율적인 사용을 위하여, TCAM을 분할함으로써 규칙상의 IP 주소와 포트의 중복 필드를 없애고 부정(negation), 범위(range) 규칙을 최소의 엔트리로 표현하도록 한다. 또한 포트번호 조합으로 TCAM 분할을 줄여 용량상의 이점은 유지하고, TCAM 검색횟수를 줄인다. 시뮬레이션을 통해 TCAM용량을 최대 98$\%$까지 줄이면서 대용량의 규칙을 사용하는 고속 패킷 분류에도 성능저하를 줄일 수 있음을 보인다. As increasing the network bandwidth, the threat of a network also increases with emerging various new services. For a high-performance network security, It is generally used that high-speed packet classification methods which employ hardware like TCAM. There needs an method using these devices efficiently because they are expensive and their capacity is not sufficient. In this paper, we propose an efficient packet classification using a Ternary-CAM(TCAM) which is widely used device for high-speed packet classification in which we have applied Snort rule set for the well-known intrusion detection system. In order to save the size of an expensive TCAM, we have eliminated duplicated IP addresses and port numbers in the rule according to the partitioning of a table in the TCAM, and we have represented negation and range rules with reduced TCAM size. We also keep advantages of low TCAM capacity consumption and reduce the number of TCAM lookups by decreasing the TCAM partitioning using combining port numbers. According to simulation results on our TCAM partitioning, the size of a TCAM can be reduced by upto 98$\%$ and the performance does not degrade significantly for high-speed packet classification with a large amount of rules.

학원시장 개방에 따른 대응 전략

김규호,Kim, Gyu-Ho 대한제과협회 1997 베이커리 Vol.3 No.-

최적전력조류 해석을 위한 원도우프로그램 팩키지 개발

김규호,이상봉,이재규,유석구,Kim, Gyu-Ho,Lee, Sang-Bong,Lee, Jae-Gyu,Yu, Seok-Gu 대한전기학회 2001 전기학회논문지A Vol.50 No.12

This paper presents a windows program package for solving security constrained OPF in interconnected Power systems, which is based on the combined application of evolutionary programming(EP) and sequential quadratic programming(SQP). The objective functions are the minimization of generation fuel costs and system power losses. The control variables are the active power of the generating units, the voltage magnitude of the generator, transformer tap settings and SYC setting. The state variables are the bus voltage magnitude, the reactive power of the generating unit, line flows and the tie line flow In OPF considering security, the outages are selected by contingency ranking method. The resulting optimal operating point has to be feasible after outages such as any single line outage(respect of voltage magnitude, reactive power generation and power flow limits). The OPF package proposed is applied to IEEE 14 buses and 10 machines 39 buses model system.

공군의 항공기 운영기술 발전에 관하여

김규호,Kim, Gyu-Ho 한국방위산업진흥회 1998 國防과 技術 Vol.- No.229

공군 항공기 운영 분야는 변화하는 항공기 운영 환경에 적극적으로 대응하고 자주적인 항공기 운영기술을 확보하며 최상의 공군력을 유지하기 위하여 정비(전력)생산, 운영 기술, 운영관리의 3가지 요소가 효과적으로 조화를 이룰 수 있도록 현재의 노력이 지속적으로 경주되어야 할 것이다.

해학반도도 채색안료에 대한 비파괴 특성 분석

김규호,송유나,임덕수,송정주,Kim, Gyu-ho,Song, Yuo-na,Lim, Duck-su,Song, Jeong-ju 국립문화재연구소 2007 保存科學硏究 Vol.28 No.-

A large variety of mineral pigments has been used for Korean paintings and it has known that organic pigments have been used together on the Buddhist painting and the portrait. Haehakbando-do, which is from Honolulu Academy Museum in the United States, 12-fold screen was commissioned by Court of the late Joseon Dynasty in order to pray for the King's longevity. Therefore, it seems that all material used including pigments were selected very carefully and a great deal of technical effort was gone into its process. The purposes of this research were to estimate the pigments and the contributory elements of each color used on Haehakbando-do, in accordance with the conservation treatment carried out by Gochang Conservation Institute throughout last year. Without extracting sample, property of pigment was measured by nondestructive method, X-ray spectral analysis, and by comparing with the data about ancient pigments. In spite of the limited range of pigment analysis by nondestructive method, it should be noted that this method would not cause damage to the cultural properites. White pigment was found in all colored parts except the background, so it can be suggested that white color was used as a grounding of other color pigments. This would be flake white[$2PbCO_3{\cdot}Pb(OH)_2$] as Pb was found. Pb was the only element could be found in yellow, however, it can be organic pigment like Gamboge as same as background. Red would be Cinnabar (HgS) as hydrargyrum (Hg) was detected. For the light purple in cloud, organic pigments were probably used since any element is not detected except for Pb, which is used for background. It is possible that green color is the mixture of Malachite[$CuCO_3{\cdot}Cu(OH)_2$] and Azurite [$2CuCO_3{\cdot}Cu(OH)_2$], which share Cu as their main element. Azurite[$2CuCO_3{\cdot}Cu(OH)_2$] was used for bluish pigments. Black is carbon compound. For gold, solid gold (Au) was detected. It shows that gold was gilded on the flake white background. Red painted on the frame of screen was identified as Cinnabar (HgS) and the gold pattern was solid gold (Au). The supporting leg of folding screen was made of brass because both copper and zinc were detected. In conclusion, white pigment was used as grounding of all colors of Haehakbando-do, and specific pigments were used for each color. Additionally, result from the analysis of several pigments shows that mineral pigment and organic pigment, or different mineral pigments were mixed to make various colors.

합리적 전력수요관리를 위한 직접부하제어 사업의 개선 방안

김규호,최승길,송경빈,Kim, Kyu-Ho,Choi, Seung-Kil,Song, Kyung-Bin 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.8

본 연구에서는 현 직접부하제어사업의 실태 및 문제점을 도출하고 국내 실정에 맞는 직접부하제어 활용 및 개선을 위하여 직접부하제어 사업 계약자를 대상으로 제도 개선사항, 지원금액 개선사항 및 제도 실시 등에 대한 설문조사를 하였다. 대표적으로 개선되어야 할 방안으로는 직접부하제어사업 참여 업체 증가를 위하여 기본지원금 및 제어지원금의 검토 방안과 소비자의 의견을 반영한 수요측 입찰 실시 방안이 필요하며, 시장운영과 계통운영에 있어서 페널티, 차단시간, 차단 횟수, 통보시간, 계약기간 등에 대한 기준을 정립할 필요가 있음을 확인하였다. This paper proposes the scheme to improve the current direct load control(DLC) program by inspecting the problems of the DLC program. In order to increase the number of the customers participating DLC program, a reduction of the base incentive and an increase of the direct load control incentive are suggested based on the interruption cost of electric power considering the characteristics of load types and the introduction of demand side bidding is recommended. Secondly, the standards of power system operations is required to control DLC program efficiently for the penalty, interruption times, the number of interrupting loads, notice time for the load interruption and the periods of the DLC program contract.

정상인을 통해 알아본 우울 증상과 불안 증상이 특정 인지 기능에 미치는 영향

김규호,남윤영,한지연,유리나,유빈,Kim, Kyuho,Nam, Yoon-Young,Han, Jiyeon,Yu, Rina,Ryu, Vin 한국정신신체의학회 2021 정신신체의학 Vol.29 No.1

Objectives : Based on the fact that cognitive functions decline known as comorbid symptoms of depression can precede depression, this study seeks to observe the effects of depressive symptoms and anxiety symptoms on cognitive function in healthy subjects. Methods : To recruit 50 general populations to evaluate cognitive and clinical symptoms and to find out the effects of clinical symptoms on cognitive functions, Pearson correlation and multivariate regression were conducted. Correlation analysis of subdomain cognitive function was conducted for reliability analysis. Results : Trail making test-B that evaluates the execution function correlates with depressive symptoms (r=0.300, p=0.03) and age (r=0.323, p=0.02). Depressive symptoms (β=0.304, p=0.03) and age (β=0.335, p=0.01) were significantly related to Trail making test -B (Adjusted R²=0.148). Subjective cognitive tests correlates with anxiety symptoms (r=0.434, p=0.002). In the correlation between cognitive functional items, Subjective cognitive tests was found to be correlated with other test except Spotter. Conclusions : In this study, depressive symptoms contribute independently to executive functions in addition to demographic characteristics such as age and duration of education. Given that cognitive decline is a common long-term clinical outcome in depression, we expect active early intervention and evaluation of cognitive function to be helpful. 연구목적 본 연구는 우울증의 동반증상으로 알려진 인지 기능 저하가 우울증보다 선행될 수 있다는 점에 착안하여 정상인에게서 우울 증상과 불안 증상이 인지 기능에 미치는 영향을 관찰하고자 한다. 방 법 일반인 50명을 모집하여 인지 기능 및 임상 증상에 대한 평가와 임상 증상이 인지 기능에 미치는 영향을 알아보기 위해 피어슨 상관분석과 다변량 회귀분석을 시행하였다. 우울증에서 흔히 저하되는 인지 영역을 평가하는 검사 소항목간의 상관성을 알아보기 위해 위해 소항목간 상관분석을 시행하였다. 결 과 선로잇기검사(B형)는 우울 증상(r=0.300, p=0.03)과 나이(r=0.323, p=0.02)와 상관 관계를 보였고 이에 영향을 미치는 독립변수는 우울 증상(β=0.304, p=0.03)과 나이(β=0.335, p=0.01)이며 선로잇기검사(B형)에 대해 14.8%의 설명력을 보여주었다. 주관적 인지 기능 검사는 불안 증상(r=0.434, p=0.002)과 상관 관계가 있었다. 인지 기능 소항목간 상관분석에서 주관적 인지 기능검사는 주의력검사를 제외한 나머지 항목과 상관 관계가 있었다. 결 론 본 연구에서 우울 증상은 나이, 교육기간 같은 인구학적 특성 외에 독립적으로 실행기능에 기여하는 것을 알 수 있었다. 우울증에서 인지 기능 저하가 흔한 장기적인 임상 결과임을 감안할 때 인지 기능에 대한 적극적인 조기 개입과 평가가 도움이 될 것으로 기대한다.

면/폴리에스터 혼방사의 제조공정별 불균제도 최적화(I) -연조 슬라이버의 불균제도-

김규호,이대훈,주창환,Kim, Gyou-Ho,Lee, Dae-Hoon,Joo, Chang-Whan 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.2

Evenness of the cotton/polyester(C/P) blend slivers produced with different processing conditions from a drawing frame is significantly affected on the quality of final spun yarns. In this study, we have compared experimental data with theoretical data on the evenness of C/P blend slivers, and established the optimum condition of drawing process, such as blending ratio, doubling strand and passage of drawing. The results obtained can be summarized as follows: The limiting irregularity ($CV_{h-lim}$) formula of the cotton sliver considered fiber fineness and fiber extent and the limiting irregularity ($CV_{h-lim}$) formula of C/P blend slivers were theoretically established. The limiting irregularity of blend slivers has decreased with increasing polyester fibers in blend slivers. Also, The limiting irregularity of blend slivers has decreased 0.1% with increasing doubling strand and 0.02% with increasing number of passage. The actual irregularity of C/P blend slivers has decreased 2.5% at 4 and 6 doubling, 0.9% at 6 and 8 doubling, respectively. Also, the actual irregularity has decreased 2.3% at 1 and 2 passage conditions, but it showed the uniform trend at 3 and 4 passage conditions. As the analysis result of irregularity index, the optimum condition of C/P blend slivers has estimated at 6 doubling and 2 passage of drawing processes.