대용량 텍스트 데이터베이스를 위한 효율적인 2단계 합성 요약 화일 방법

유재수(Yoo Jae Soo),강형일(Kang Hyung Il) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.4

In this paper, we propose a two-level hybrid signature file method(THM) to efficiently deal with large text database that use a term discrimination concept. In addition, we apply Yoo's clustering scheme to the two-level hybrid signature file method. The clustering scheme groups similar signatures together according to the similarity of the highly discriminatory terms so that we may achieve better performance on retrieval. The space-time analytical model of the proposed two-level hybrid method is provided. Based on the analytical model and experiments, we compare it with the existing methods, i.e., the bit-sliced method(BM), the two-level method(TM), and the hybrid method(HM). As a result, we show that THM achieves the best retrieval performance in a large database with 100,000 records when the number of matching records is less than 160.

여중생의 체육수업 기피요인 분석

유창재,김영수,김수덕 신라대학교 교육과학연구소 2004 교육과학연구 Vol.- No.9

유자액을 이용한 소스의 이화학적 특성 및 저장성

유경미,서우영,서한석,김완수,박재복,황인경 한국조리과학회 2004 한국식품조리과학회지 Vol.20 No.4

The purposes of this study were to investigate the physicochemical characteristics and storage stabilities of various sauces with added Yuza(Citrus Junos). Yuza consisted of three parts: peeled (46.17%), fleshed (43.74%) and seeded (10.09%). Yuza juice revealed 11.33% extraction yield, pH 2.85, 4.18% total acidity, 11° Brix, 1.16% transmittance and 2.63° Brix/acid ratio. Five kinds of sauces with added Yuza juice were Yuza red pepper paste sauce, Yuza soybean sauce for meat, Shahu shabu Yuza sauce, Korean Yuza vegetable sauce and Japanese Yuza soybean sauce. These sauces showed slight changes in pH, total acidity, total bacterial counts and overall sensory characteristics during storage period (60 days). In conclusion, Yuza juice could be applied to various sauces, which remained usable for 60 days.

혼화재 종류 및 친환율에 따른 콘크리트의 염소이온 침투저항성 평가에 관한 연구

유재강,김동석,이상수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This research was to investigate the invasion and diffusion properties of chloride ion on the concrete containing mineral admixtures. Mineral admixtures contained in mixes were fly-ash, ground granulated blast-furnace slag, silica fume, and meta-kaolin. For the Rapid Chloride Penetration Test(RCPT), Tang and Nilsson's test method was used to estimate chloride ion diffusion coefficients of that mixes. And the RCPT test results were compared with the penetration depth measured from long-term ponding test with 3.6% sodium chloride solution. As a result, the diffusion coefficient of chloride ion were reduced with the use of mineral admixtures and the compressive strength was related with the diffusion coefficient of chloride ion. The diffusion coefficients from the RCPT and the penetration depth at 91 days of ponding test with the sodium chloride solution have a well established.

ATM망 트래픽 제어 알고리즘 연구

유진호,손준영,안재환,박성우,김명수,장혁수 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-

ATM(Asynchronous Transfer Mode) is a transmission technique for the B-lSDN(Broadband Integrated Service Digital Network). Congestion problems are unavoidable in the ATM networks, since various traffic typos coexist in the networks. The preventive congestion control algorithm is widely used for the real time traffics such as voice and video. The reactive congestion control algorithm works well for the non-real time traffic within a short distance. A mixed traffic control algorithm is proposed, which works either preventively or reactively based on traffic types. The proposed algorithm sets a high and low threshold value at the output buffers and modifies the EPRCA(Enhanced Proportion Rate Control Algorithm) to control loss-sensitive cells. Delay-sensitive cells are handled by the priority control and the UPC(Usage Parameter Control) algorithm. The performance analysis shows that the proposed traffic control algorithm works well for both the VBR(Variab1e Bit Rate) and ABR(Available Bit Rate) traffic with small buffers

최적유동을 위한 수조 내 팬의 위치에 관한 연구

박성수,도영민,유재환 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3

In this numerical study, characteristics of swirl generation by the fan and selection of the location of the fan was studied theoretically by the modified TEACH code. The governing equation for the system are solved by means of the three dimensional version of the SIMPLE method and STAGGERED grid. From the present results, the optimal position of the fan is 0.625(h/H).

Cathode materials of Li ion battery

심영재,문성인,형유업,도칠훈,윤문수 국립경상대학교 공과대학 부설 첨단소재연구소 1994 尖端素材 Vol.4 No.-

Li ion 2차전지는 높은 전지전압, 낮은 자기방전율, High Energy Density High Power Density Non-Toxic, No Memory Effect등의 우수한 특성을 보유하고 있고, 환경적인 측면에서 Lead Acid 전지 및 Ni/Cd 전지 등과 같은 Pb, Cd 및 Hg 등으로 인한 환경오염문제가 없는 고성능 신형전지로써, 92년에 SONY사에서 최초의 시제품을 내놓은 이래 현재 소형녹음기, 캠코더 및 셀룰라폰용으로 시판되고 있으나 세계적으로 Li ion 전지를 생산할 수 있는 회사는 일본의 몇몇 기업으로 한정되어 있는 실정이다.

Cell 부하량에 따른 DS-CDMA 셀룰러 시스템의 최소기간 차단율

김남수,유재훈 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.18 No.1

The minimum dur ation outage probability of a cellular system is defined the probability that the received signal level is hold under minimum required threshold duration. This definition is more realistic compared to the outage probability which is the received signal st r ength level is below predefined threshold level. Especially, in a DS-CDMA cellular system the received signal-to-interference ratio is a function of the cell traffic. Therefore this paper is considered the minimum duration outage probability as a function of cell traffic, while the former researches are only considered the minimum duration outage probability independent of the cell traffic We noticed that the minimum outage probabilitv is rapidly increases as cell traffic increase.

난소절제후 Estrogen을 투여한 흰쥐 대동맥에서 Protein Kinase C-α와 Fas 발현의 변화

이왕수,이상엽,안지현,송영빈,김학진,이광재,유재격,김상욱,김태호,김치정,류왕성 중앙대학교 의과대학 의과학연구소 2001 中央醫大誌 Vol.26 No.3

Estrogen is believed to decrease coronary artery disease. Protein kinase C-α(PKCα)appear to be important in signal conduction pathways. Estrogen treatment increases catalytic activity of PKCα,and activation of PKCαcan modulate estrogen receptor levels and responsiveness. And it was reported that activation of PKC can protect cells from apoptosis induced by Fas ligation. But the beneficial effect of estrogen on PKCαwas not clearly demonstrated. The objective of this study was to evaluate the role of PKCαafter ovariectomy and estrogen therapy in rat aorta. The results were summarized as below: 1. The significant pathological changes were not observed in the rat aorta irrelevant to ovariectomy and estrogen therapy. 2. The expression of Fas was decreased in the aorta of estrogen-treated rats than that of ovariectomized rats without estrogen therapy. 3. Increased expression of PKCαwas more marked in the aprta of estrogen-treated rats than that of ovariectomized rat without estrogen therapy. In conclusion,PKCαmay be important in signal conduation pathway on the effect of estrogen. Activation of PKCαby estrogen reduced Fas expression, suggesting that PKCαactivation may play a role in protection against atherasclerosis. Further studies are needed to elucidate the role of PKCαafter estrogen therapy.

이동객체의 미래 위치 검색을 위한 공간 분할 방식의 색인 구조

복경수,유재수 충북대학교 컴퓨터정보통신 연구소 2005 컴퓨터정보통신연구 Vol.13 No.1

최근 위치 기반 서비스의 급속한 발전과 함께 이동 객체 데이터베이스에 대한 많은 연구들이 진행되고 있다. 본 논문에서는 이동 객체의 미래 위치 검색을 지원하는 색인 구조를 제안한다. 제안하는 색인 구조는 기존의 공간 분할 방식 색인 구조를 변형하여 이동 객체의 미래 위치를 검색을 지원한다. 제안하는 색인 구조의 중간 노드에는 자식 노드를 포함하는 영역 정보와 함께 이동 객체의 미래 위치 검색을 지원하기 위해 정보를 저장한다. 노드에 오버플로우가 발생할 경우 분할을 방지하기 위해 병합 분할을 수행한다. 병합 분할이 가능하지 않을 때에는 객체의 이동성을 고려하여 분할을 수행한다. 제안하는 색인 구조의 우수성을 입증하기 위해 기존에 제안된 색인 구조와 검색 성능을 비교한다. With the rapid development of location-based services, moving objects databases have become an important research issue. In this paper, we propose a new index structure which supports the future position retrieval of the moving objects. The proposed index structure is a space partitioning index structure that retrieves the future location of the moving objects. The proposed index structure stores the region information on the current positions and velocities of moving objects to efficiently support the future position retrieval in the internal node. If the overflow occurs in nodes, the index structure processes a merge split to avoid a split. If a merge split is impossible, a split is processed with considering moving features of object. We show through the various experiments that our index structure outperforms the existing index structures in terms of retrieval performance.