• Journal of Microbiology
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• 제35권1호
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• pp.40-46
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• 1997

The pWHM220 cosmid with a 24-kb insert cloned from Streptomyces albus ATCC 21838 induces the biosynthesis of a polysther antibiotic similar to salinomycin in Streptomyces invidans. We have analyzed this region by DNA sequencing as well as Southern blot hybridization with type I and type II polyketide synthase (PKS) probes. Surprisingly, we found another set of type II SKS genes only 10-kb from the original PKS genes, salABCDE. The DNA sequence revealed two complete open reading frames (ORFs) named salB2 and salC2, and one partial ORF that does not resemble any known DNA or deduced protein sequence. The salC2 should code for chain length determining factor while the deduced amino acid sequence encoded by salB2 exhibits high similarity to .betha.-ketoacyl synthase from different PKS gene clusters. The highest identity was found for .betha.-keetoacyl synthases from S. argillaceus (MtmP. 59.1% identity), the mithramycin producer and from S. venezuelae ISP5230 (JadA, 52.3% identity), the jadomycin producer. The SalC2 protein clearly resembles its counterparts in order aromatic PKS gene clusters that are believed to influence the length of the polyketide chain. The highest identities observed were to that of S. argillaceus (MtmK, 62.3%) and S. venezuelae ISP 5230 (JadB, 55.1%) proteins, Moreover, the deduced amino acid sequences of the salB2 and salC2 products were 29.0% identical.

• 한국실내디자인학회논문집
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• 제21권6호
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• pp.35-45
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• 2012

As the importance of economic value of culture has increased, governments have set a strategy to secure national competitiveness through cultural art. One of concrete ways is establishing a cultural space by using idle facilities. This study aims to analyze publicness of Seoul Art Space, suggest ways to improve the facilities of creative space and provide basic date for the further plan of creative space. The object of this study is 8 facilities from Seoul Art Space which is operated by City of Seoul. Through literature review, we extracted 5 elements(each element has 4 sub categories) for publicness(accessibility, openness, convenience, historical connectivity and stay time) and to evaluates publicness of the Seoul Art Space, we analyzed these facilities based on these elements. The results are as follows: The publicness of Seoul Art Space acquired 96.9%(100% is 64 points) for stay time, 95.3% for convenience, 90.6% for accessibility, 73.4% for openness and 62.5% for historical connectivity. For the openness, we suggest to use glass materials and open the space to the public. To improve historical connectivity, we suggest to determine appropriate theme for a particular space or area and set a function of buildings for the differentiation.

• 한국해안해양공학회지
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• 제6권3호
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• pp.266-274
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• 1994

우리나라 서해안에 위치한 인천해역의 개발에 따른 조석특성을 분석하기 위하여 2차원 수치모형을 이용한 수치분석을 수행하였다. 먼저 기존 및 새로운 조석관측 자료를 분석하고, 수학적 모형으로서 수심 적분한 천수방정식을 선정하였으며, 이에 따른 수치모형은 Flather and Heaps(1975)의 모형을 사용하였다. 관측된 2개 주요분조 M$_2$와 S$_2$를 외해 경계조건으로 입력하여 모형을 수립하고, 수립된 모형을 2종류의 인천해역 개발안에 따라 적용하였다. 이 해역이 개발될 때 대조시 조석 변화양상을 평가한 결과 진폭변화는 미약하나 조류변화는 부분적으로 크게 나타낸다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권5호
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• pp.1932-1950
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• 2018

The paper proposes a code-clone detection method that gives the highest possible precision and recall, without giving much attention to efficiency and scalability. The goal is to automatically create a reliable reference corpus that can be used as a basis for evaluating the precision and recall of clone detection tools. The algorithm takes an abstract-syntax-tree representation of source code and thoroughly examines every possible pair of all duplicate tree patterns in the tree, while avoiding unnecessary and duplicated comparisons wherever possible. The largest possible duplicate patterns are then collected in the set of pattern clusters that are used to identify code clones. The method is implemented and evaluated for a standard set of open-source Java applications. The experimental result shows very high precision and recall. False-negative clones missed by our method are all non-contiguous clones. Finally, the concept of neighbor patterns, which can be used to improve recall by detecting non-contiguous clones and intertwined clones, is proposed.

• Structural Engineering and Mechanics
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• 제35권3호
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• pp.265-282
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• 2010

The shear contribution of transverse steel in reinforced concrete beams is generally assumed as independent of the concrete strength by most of the building codes. The shear strength of RC beams with web reinforcement is worked out by adding the individual contributions of concrete and stirrups. In this research 70 beams of medium strength concrete in the range of 52-54 MPa, compressive strength were tested in two sets of 35 beams each. In one set of 35 beams no web reinforcement was used, whereas in second set of 35 beams web reinforcement was used to check the contribution of stirrups. The values have also been compared with the provisions of ACI, Eurocode and Japanese Code building codes. The results of two sets of beams, when compared mutually and provisions of the building codes, showed that the shear strength of beams has been increased with the addition of stirrups for all the beams, but the increase is non uniform and irregular. The comparison of observed values with the provisions of selected codes has shown that EC-02 is relatively less conservative for low values of longitudinal steel, whereas ACI-318 overestimates the shear strength of RC beams at higher values of longitudinal steel. The Japanese code of JSCE has given relatively good results for the beams studied.

• PNF and Movement
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• 제18권1호
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• pp.133-141
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• 2020

Purpose: The purpose of this study was to conduct balance training through vision control to improve the balance, postural control, and balance confidence and to decrease the visual and sensory dependence of stroke patients. Methods: Twenty-eight chronic stroke patients volunteered to participate in the study. They were randomly assigned to the eyes-closed and the eyes-open training groups. Three times a week for four weeks each group performed an unstable-support session and a balance training session for thirty minutes per set. Their balance, postural control, and balance confidence were assessed using BIO Rescue (BR), the postural assessment scale for stroke (PASS), and the Korean activity-specific balance confidence scale (K-ABC), respectively. All data were analyzed using SPSS version 22.0. Statistical methods before and after working around the average value of each dataset were independent T-test. The significance level for statistical analyses was set at 0.05. Results: Comparison between the groups showed statistically significant effects on all variables before and after the intervention (p < 0.05). Conclusion: This study reflected that balance-training programs involving vision control improve the balance, postural control, and balance confidence of chronic stroke patients. Thus, stroke patients should undergo training programs that increase the use of their other senses with vision control in clinical practice.

• 전기전자학회논문지
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• 제22권4호
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• pp.1131-1139
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• 2018

본 논문에서는 합성곱 신경망을 이용한 유기된 물체 인식 방법을 제안한다. 유기된 물체 인식 방법은 영상 내에서 유기 물체에 대한 영역을 먼저 검출하며 검출된 영역이 있을 경우 해당 영역에 합성곱 신경망을 적용하여 어떤 물체를 나타내는지 인식하는 과정을 거친다. 실험은 쓰레기 무단투기를 검출하는 응용 시스템을 통해 진행되었다. 실험 결과, 유기 물체에 대한 영역을 효율적으로 검출하는 것을 볼 수 있었다. 검출된 영역은 합성곱 신경망으로 들어가 쓰레기인지 아닌지 분류되는 과정을 거쳤다. 이를 위해 자체적으로 수집한 쓰레기 데이터와 오픈 데이터베이스로 합성곱 신경망을 학습시켰다. 학습 결과, 학습에 포함되지 않은 테스트셋에 대해 약 97%의 정확도를 달성하였다.

• 한국해양공학회지
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• 제33권3호
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• pp.280-288
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• 2019

A submerged breakwater is one of the coastal structures used to reduce wave energy and coastal erosion. However, a submerged breakwater has a negative aspect in that a strong rip current occurring around an open inlet due to a difference in mean water levels at the front and rear sides of the structure leads to scouring. Such scouring has a bad effect on its stability. In order to eliminate this kind of demerit, this study investigated an artificial reef of the overflow type with openings. We also developed a program where the flows around the artificial reef of the overflow type could be analyzed numerically. An unstructured grid system was used to cover the various geometries, and the level set method was applied to treat the movement of the free surface. To verify these numerical schemes, hydraulic physical tests were performed on the submerged breakwater and double breaking type artificial reef. Then, the wave height and velocity distribution around the reef were examined using the experimental results. Comparisons between the results of hydraulic and numerical tests showed reasonable agreement.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5344-5356
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• 2018

Nowadays with the help of Location-Based Social Networks (LBSNs), users of Point-of-Interest (POI) recommendation service in LBSNs are able to publish their geo-tagged information and physical locations in the form of sign-ups and share their experiences with friends on POI, which can help users to explore new areas and discover new points-of-interest, and promote advertisers to push mobile ads to target users. POI recommendation service in LBSNs is attracting more and more attention from all over the world. Due to the sparsity of users' activity history data set and the aggregation characteristics of sign-in area, conventional recommendation algorithms usually suffer from low accuracy. To address this problem, this paper proposes a new recommendation algorithm based on a novel Preference-Content-Region Model (PCRM). In this new algorithm, three kinds of information, that is, user's preferences, content of the Point-of-Interest and region of the user's activity are considered, helping users obtain ideal recommendation service everywhere. We demonstrate that our algorithm is more effective than existing algorithms through extensive experiments based on an open Eventbrite data set.

• 정보보호학회논문지
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• 제19권6호
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• pp.161-174
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• 2009

IPTV에서는 제한수신시스템(Conditional Access System, CAS)을 사용하여 자격을 갖춘 시청자 만이 시청이 가능하도록 한다. 현재까지 CAS는 set-top box 혹은 cable card를 이용하여 사용자에게 서비스를 제공하는 것이 일반적이었지만 근래에는 기기간 호환성 문제 해결, DRM 등 다른 서비스와의 연동 문제 해결, 안전성 확보 등을 이유로 다운로드 가능한 CAS 시스템(Downloadable CAS, DCAS)에 대한 연구가 이루어 지고 있다. 본 논문에서는 오픈 케이블 기반의 DCAS 시스템의 취약성을 분석 및 보완하여 안전한 DCAS 시스템을 제안한다. 또한 제안한 시스템의 구현결과를 보여 요구사항에 대한 만족도를 분석한다.