• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 추계 학술논문 발표대회 논문집
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• pp.91-94
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• 2006

The way to shorten a construction period is considered to an very important technology development element as reducing the formwork removal periods with promoting strength revelation own concrete. This study executed experiment to review usability of early strength revelation chemical admixture which is judged in ways effective with premature removal of form about concrete. Use of early strength revelation AE water reducin admixture is apperaing so that strength revelation by early hydration promotions is excellent. The results of being applied proposed work process are that compressive strength are appeared more than 5MPa within 16 hours so that removal of vertical form was possible. the concrete compressive strength satisfied with a more than 2/3 of specified concrete strength for removal of horizontal form are appeared in 42 hours of 27 MPa proportioning strength, in 36 hours of 30, 35 MPa proportioning strength so that the 6 days cycle time of concrete structural frame work is cut by 2 days as shortening delayed period in works of removing slab forms. So construction cost reductions and a construction period shortening are judged so that it is possible.

• 한국건축시공학회지
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• 제17권1호
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• pp.23-30
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• 2017

순환골재가 복토 및 성토용으로 활용되는 경우 순환골재 표면의 미수화 시멘트로부터 발생하는 높은 pH의 침출수는 환경에 큰 영향을 주는 요소이다. 본 연구에서는 이러한 높은 pH의 침출수를 방지하기 위해 순환골재의 효율적인 알칼리 제거 방안에 대해 실험적으로 비교분석 하였다. 실험결과 순환골재의 높은 알칼리성을 감소시키기 위해서는 단순 야적 및 물을 이용한 씻기 방법보다는 비료를 사용한 처리방법이 가장 유리한 것으로 나타났다. 또한, 본 연구에서는 비료의 종류인 인산암모늄과 이인산암모늄을 활용하여 순환골재를 중화시켰고 그 결과 약 3주 만에 pH 8의 중성에 가까운 순환잔골재를 얻을 수 있었다. 본 연구를 통해 순환골재를 토공사용으로 사용할 때에 보다 환경에 안전한 지속가능한 재료로서 활용하는 데에 기여할 것으로 예상한다.

• 산업경영시스템학회지
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• 제43권2호
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• pp.79-86
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• 2020

To make a satisfactory decision regarding project scheduling, a trade-off between the resource-related cost and project duration must be considered. A beneficial method for decision makers is to provide a number of alternative schedules of diverse project duration with minimum resource cost. In view of optimization, the alternative schedules are Pareto sets under multi-objective of project duration and resource cost. Assuming that resource cost is closely related to resource leveling, a heuristic algorithm for resource capacity reduction (HRCR) is developed in this study in order to generate the Pareto sets efficiently. The heuristic is based on the fact that resource leveling can be improved by systematically reducing the resource capacity. Once the reduced resource capacity is given, a schedule with minimum project duration can be obtained by solving a resource-constrained project scheduling problem. In HRCR, VNS (Variable Neighborhood Search) is implemented to solve the resource-constrained project scheduling problem. Extensive experiments to evaluate the HRCR performance are accomplished with standard benchmarking data sets, PSPLIB. Considering 5 resource leveling objective functions, it is shown that HRCR outperforms well-known multi-objective optimization algorithm, SPEA2 (Strength Pareto Evolutionary Algorithm-2), in generating dominant Pareto sets. The number of approximate Pareto optimal also can be extended by modifying weight parameter to reduce resource capacity in HRCR.

• 한국산학기술학회논문지
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• 제19권11호
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• pp.166-181
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• 2018

본 연구의 목적은 비만환자의 비만을 감소시키기 위한 침술요법의 현황을 파악하고 침술요법의 내용과 효과를 파악하는 것이다. 문헌검색은 '비만', '침', '이침', '전기침' 등을 검색어로 하여 한국학술정보, 한국교육학술정보원, 국회도서관, Pubmed, CINAHL 등을 통해 2003년 1월부터 2017년 12월까지 발표된 연구논문을 검색하였다. 연구자가 원본을 확인한 후, 선정한 19편의 논문을 최종 분석 하였다. Scottish Intercollegiate Guideline Network의 체크리스트로 논문의 질적 평가를 실시한 결과 10점 만점에 9점인 연구가 1편, 10점 만점에 7-8점인 연구가 15편, 10점 만점에 6점인 연구가 2편, 10점 만점에 3점인 연구가 1편이었다. 침술요법의 내용을 파악한 결과 비만을 감소시키기 위한 경혈점은 shemen, hunger, LI-11(Quchi), LI-4(Hegu), St-25(Tianshu), St-44(Neiting) 등이었다. 침술요법 총 시행 횟수는 평균 16.9회이었고, 침술요법 중재 기간이 20일 혹은 72일인 연구에서의 침술요법 중재 빈도는 1회/1-2일이었고, 침술요법 중재 기간이 4-18주인 연구에서의 침술요법 중재빈도는 1-3회/주이었다. 분석한 연구결과에 의하면 침술요법은 신체계측수치의 감소, 혈당 및 혈중 지질 농도의 감소, 혈중호르몬 변화 등을 일으켜 비만환자의 비만을 감소시키는 효과가 있었다. 향후 비만환자의 비만감소를 위한 침술요법의 효과성을 평가하기 위해 잘 설계된 연구가 시급히 필요하다.

• 융합정보논문지
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• 제8권6호
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• pp.243-249
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• 2018

본 논문에서는 가시광 통신시스템의 변조 방식과 각 변조 방식이 Dimming level에 미치는 영향을 분석하고, 지연신호로 인한 왜곡이 미치는 영향에 대해서 연구하였다. 현재 가시광 통신에서 가장 많이 사용되는 변조 방식들은 통신 성능은 증가하나 전체 조명의 밝기를 감소시키는 결과를 나타낸다. 연속적인 Burst Zero Duration이 발생하면 조명 기능이 심각하게 저하된다. 이는 조명뿐만 아니라 전체 시스템의 성능저하 시키게 되며 Flicker 현상을 유발한다. 본 논문에서는 이러한 변조 기술과 조명-통신 성능의 관계를 분석하고, 신호지연으로 인한 왜곡이 발생하였을 경우에 가시광 통신 시스템에 미치는 영향을 연구하였다. 시뮬레이션을 통해 통신-조명성능이 가장 좋은 IPI-OOK의 성능을 분석하고 그에 따른 향후 연구방향을 제안하였다.

• 대한정형외과스포츠의학회지
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• 제5권2호
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• pp.147-154
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• 2006

목적: 장경대 마찰 증후군으로 진단된 환자에서 시행된 스트레칭 운동의 치료 효과에 대하여 분석하였다. 대상 및 방법: 장경 대 마찰 증후군으로 진단된 22예를 대상으로 하였다. 양호한 치료 결과는 8주 내에 치료 결과 분류 상 75% 이상의 회복을 보인 경우로 하였다. 8주에 확인된 자가 스트레칭 운동의 성실성 유무에 따른 양호한 치료 결과를 보이는 시기까지의 치료 기간 차이를 분석하였다. 스트레칭 운동의 성실성은 처방한 운동 치료의 50% 이상 이행한 경우로 하였다. 결과: 치료 후 8주 내에 19예 (87%)의 환자에서 양호한 치료 결과를 보였다. 치료 실패를 보인 3예를 제외 한 경우 양호한 결과를 보이는 환자의 평균 치료 기간은 13.1일 이었다. 양호한 결과를 보인 환자들의 내원 전 증상 기간(평균 25.6일)과 치료 기간(평균 28.1일)과의 연관 관계에서도 통계적 의미가 없었다. 스트레칭 운동을 성실히 시행한 군과 시행하지 않았던 군의 비교에서 치료 기간은 각각 평균 23일 및 32.7일 이었으며 통계적으로 의미 있는 차이를 보였다. 결론: 장경대 마찰 증후군 환자들의 치료로 시행된 스트레칭 운동은 치료 기간의 단축에 도움이 되었다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제24권5호
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• pp.423-431
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• 2021

Purpose: To assess the effect of combination probiotic Saccharomyces boulardii CNCM-I 3799 and Bacillus subtilis CU-1 in outpatient management of acute watery diarrhea in children. Methods: A randomized double-blind placebo-controlled study was conducted in 180 participants aged six months to five years with acute mild to moderate diarrhea. All were enrolled from six centers across India and centrally randomized to receive S. boulardii CNCM-I 3799 and B. subtilis CU-1 or a placebo along with oral rehydration salts and zinc supplementation. Each participant was followed up for three months to assess recurrence of diarrhea. Results: The mean duration of diarrhea in the probiotic and placebo groups were 54.16 hours and 59.48 hours, respectively. The difference in the duration of diarrhea in those administered with probiotic or placebo within 24 hours of diarrhea onset was 25.21 hours. Furthermore, the difference in duration of diarrhea was 13.84 hours (p<0.05) for participants who were administered with probiotics within 48 hours. There were no significant differences in the stool frequencies between the two arms. After three months, 15% in the probiotic group and 18.5% in the placebo group reported episodes of diarrhea. The mean duration of diarrhea was considerably lower in the probiotic group, 31.02 hours versus 48 hours in placebo (p=0.017). Conclusion: S. boulardii CNCM-I 3799 and B. subtilis CU-1 combination was effective in reducing the duration of diarrhea when administered within 48 hours of diarrhea onset. Similarly, it reduced recurrence of diarrhea and its intensity in the subsequent three months.

• Journal of Ginseng Research
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• 제24권3호
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• pp.134-137
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• 2000

Spontaneous bursting activity was studied in rat thalamocortical slices using extracellular field potential recording to test the potential utilization of ginsenoside Rb$_1$ in controlling overactivated neural systems. In order to induce bursting activity, slices were perfused with Mg$\^$2+/-free artificial cerebrospinal fluid (ACSF). Two major types of spontaneous bursting activity, simple thalamocortical burst complexes (sTBCs) and complex thalamocortical burst complexes (cTBCs), were recorded in Mg$\^$2+/ -free ACSF. Ginsenoside Rb$_1$ selectively suppressed cTBCs. Duration and occurrence rate of cTBCs were reduced by 87.3${\pm}$10.2% and 85.3${\pm}$ 14.7% in the presence of 90 ${\mu}$M ginsenoside Rb$_1$ respectively, while amplitude and intraburst frequency were slightly changed by ginsenoside Rb$_1$. In contrast, ginsenoside Rb$_1$was much less effective in reducing duration and occurrence rate of sTBCs. We also tested effects of ginsenoside Rb$_1$ on bursting activity in the presence of a GABA$\sub$A/ receptor antagonist, bicuculline methiodide (BMI). Ginsenoside Rb$_1$ had no effect in suppressing BMI-induced bursting activities. These results suggest that ginsenoside Rbi may be useful in controlling seizure-like bursting activity under pathological conditions.

• 한국정보처리학회논문지
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• 제6권11호
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• pp.3131-3139
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• 1999

Satisfying the rigid timing requirements of various real-time activities in real-time systems often requires some special methods to tune the systems run-time behaviors. Unbounded blocking can be caused when a high priority activity cannot preempt a low priority activity. In such situation, it is said that a priority inversion has occurred. The priority inversion is one of the problems which may prevent threads from meeting the deadlines in the real-time systems. It is difficult to remove such priority inversion problems in the kernel at the same time to bound the worst case blocking time for the threads. A thread is a piece of executable code which has access to data and stack. In this paper, a new real-time systems. It is difficult to remove such priority inversion problems in the kernel at the same time to bound the worst case blocking time for the threads. A threads is a piece of executable code which has access to data and stack. In this paper, a new real-time server model, which minimizes the duration of priority inversion, is proposed to reduce the priority inversion problem. The proposed server model provides a framework for building a better server structure, which can not only minimize the duration of the priority inversion, but also reduce the deadline miss ratio of higher priority threads.

• 대한치과교정학회지
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• 제24권1호
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• pp.221-231
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• 1994

The short-term effects of plaque control instruction were studied in 42 adolescent orthodontic patients under active fixed treatment. At first visit, all the patients were received plaque control instruction using materials such as oral hygiene education slides, dentiform, disclosing agents, tooth brush and interdental brush. After that, Pateints were asked to perform the tooth brushing according to instructions. Such a procedure was repeated every week lot 3 weeks. Plaque index and bleeding index were scored once a week for 4 weeks and were compared according to ages, sex and duration with fixed appliance. The results were as follows: 1. Plaque control instruction was effective in reducing plaque accumulation and gingival inflammation of the orthodontic patients. 2. The effect of plaque control instruction was continued during 3 weeks among all groups of subjects, and it was prominent at the first week. 3. There was no statistically significant difference in the effects of the plaque control of instruction according to sex, ages, or duration with fixed appliances.