• 한국환경과학회지
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• 제25권10호
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• pp.1407-1415
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• 2016

In this study, we investigated the relationship between noise reduction and the community structure of nine groups of typical plant communities as well as the reduction in noise at different frequencies. The semantic differential method was adopted to explore the perception of noise reduction. The results indicated that there was a significantly positive correlation between noise reduction and coverage, a significantly negative correlation between noise reduction and bifurcate height, and a negative correlation between noise reduction and bare rate. However, there was no significant correlation between noise reduction and height, diameter at breast height, or crown width. The reduction of middle-frequency noise was better than that of low- and high-frequency noise. The indicators "quiet" and "calm" showed that plant communities could reduce the noise perceived by humans. However, overly dense woodland caused nervousness, fear, depression, and other negative effects. Relatively open environments and those with large forest gaps obtained the highest evaluation.

• Structural Engineering and Mechanics
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• 제24권3호
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• pp.355-374
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• 2006

Thin walled steel bridge-piers/columns are vulnerable to damage, when subjected to earthquake excitations. Local buckling, global buckling or interaction between local and global buckling usually is the cause of this damage, which results in significant strength reduction of the member. In this study new innovative design concepts, "thin-walled corrugated steel columns" and "thin-walled cellular steel columns" are presented, which allow the column to undergo large plastic deformations without significant strength reduction; hence dissipate energy under cyclic loading. It is shown that, compared with the conventional designs, circular and stiffened box sections, these new innovative concepts might results in cost-effective designs, with improved buckling and ductility properties. Using a finite element model, that takes the non-linear material properties into consideration, it is shown that the corrugations will act like longitudinal stiffeners that are supporting each other, thus improving the buckling behavior and allowing for reduction of the overall wall thickness of the column.

• Journal of Advanced Marine Engineering and Technology
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• 제26권2호
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• pp.248-255
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• 2002

Miller cycle was studied and analyzed by engine performance simulation to achieve very low fuel consumption and to meet the IMO NOx regulation on a medium speed diesel engine. Based on the performance simulation results the intake valve closing time for HYUNDAI HiMSEN 6H21/32 engine was set at 0deg.ABDC(After Bottom Dead Center). Also, the simulation results indicated that significant NOx reduction could be achieved with low reduction of fuel consumption. The performance simulation investigated the effect of compression ratio and turbocharger on fuel consumption and NOx concentration in combination with Miller cycle. The results indicated a significant reduction of fuel consumption with keeping NOx concentration. The results of performance simulation were compared with measured data to verify simulation results. The comparison showed the maximum error was 2.34% in exhaust temperature. Also, the experimental result showed that improvement in BSFC(Brake Specific Fuel Consumption) was 5.8g/kwh with keeping NOx level similar to simulation result.

• 한국안전학회지
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• 제25권2호
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• pp.89-94
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• 2010

This study deals with the traffic accident according to the improvement projects of frequent accident locations. The objective is to analyze the impact of improvements on the accident reduction. In pursuing the above, the study gives the particular attentions to developing the models based on the data of 70 intersections improved. The main results analyzed are as follows. First, 4 multiple linear regression accident models(total, side right-angle, rear end and side stripe accident) which were statistically significant were developed. Second, total accidents reduction by sight-distance and turning traffic flow improvements, side right-angle by sight-distance, over-speed and lane operation, rear end by turning traffic flow, signal and lane operation, and side stripe by traffic impedance improvements were analyzed. Finally, the above 4 models were evaluated to be statically significant through the correlation analysis and pair-sample t-test.

• 대한한방부인과학회지
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• 제26권2호
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• pp.138-150
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• 2013

Objectives: To observe randomized controlled trials(RCTs) related to investigating the effects of acupoint treatments on nausea and vomiting in pregnancy to establish the basis of korean medical treatments, and suggest the problems of future clinical research. Methods: After searching for national and international papers published after 2000 and restricting the parameters to 'clinical trial', 'controlled clinical trial', 'randomized controlled trial', then comparing the subjects, methods, research tools, and results to understand the effects and re-comparing the conflicting results to assume the cause. Results: Of the 9 research papers that applied acupressure, four of them used control and experimental groups, and three(75%) research papers indicated significant reduction in vomiting and nausea, and of the seven research papers that utilized the experimental and placebo groups, five(71.4%) reported significant reducing effects. Of the four research papers the used acupuncture treatments, four research papers using control and placebo groups, two showed improvements in symptoms but did not have significant results compared to sham acupuncture groups, and two showed significant reduction of symptoms compared to the control groups. The one research paper that used electrical stimulation showed significant results in the reduction of vomiting and nausea compared to the control group. Conclusions: Acupressure and electrical stimulation showed efficacy reducing the symptoms. Acupuncture treatments did not indicate efficacy some experiments. Therefore it is thought that future acupuncture treatments should use methods that resemble actual clinical medicine to establish efficacy to produce significant results.

• 한국콘텐츠학회논문지
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• 제8권10호
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• pp.301-308
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• 2008

본 연구의 목적은 태권도 선수들을 대상으로 운동, 식이제한, 탈수의 방법으로 단기간 체중감량을 했을 때 체력, MDA와 SOD의 변화를 규명하는 것이다. 이를 위한 피험자는 10명의 대학 태권도 선수가 참여했고, 이들은 경력 7년 이상의 기능이 우수한 선수들이다. 체중감량의 기간과 수준은 1주일간 자기체중의 5%로 한정하였다. 체중감량 전후 체력, MDA와 SOD가 측정되었다. 체력은 근력, 근지구력, 유연성, 민첩성, 평형성 그리고 반응시간이 측정되었고 혈액 검사는 MDA와 SOD가 분석되었다. 자료는 체중감량 전후로 종속 t 검증으로 유의성은 .05로 분석되었다. 첫째, 단기 체중감량에 의한 체력은 근력, 근지구력, 유연성, 민첩성, 평형성 그리고 반응시간에 있어서 유의한 차이가 없었다. 둘째, 단기 체중감량에 의한 MDA와 SOD는 유의한 차이가 없었다. 따라서 엘리트 태권도 선수들에 있어서 단기 체중감량에 의한 자기체중의 5% 감량은 운동수행력과 생리적 효과에 영향을 미치지 못했다. 따라서 선수와 코치들은 1주일간 자기체중 의 5%를 감량함에 있어서 운동, 식이 그리고 탈수를 고려하도록 노력해야 할 것이다.

• 대한물리의학회지
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• 제15권4호
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• pp.87-99
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• 2020

PURPOSE: This study examines the therapeutic effect of functional adjustment procedure therapy (FAPT), by comparatively analyzing behavioral disorders due to shoulder pain and subjective pain intensity subsequent to therapy, in patients with shoulder pain. METHODS: The intervention was performed on 48 employee patients with shoulder pain, Patients were administered 16 sessions of FAPT for 8 weeks, twice a week for 30 minutes per session. This study applied the neck pain and disability scale (NPDS) as a measurement tool, and used the questionnaire to measure subjective pain intensity to investigate the difference before and after administering FAPT to employee patients with shoulder pain. RESULTS: Statistically significant difference was obtained between the mean difference in shoulder pain disorder, before and after FAPT. Assessing gender and age differences in the reduction effect of shoulder pain, showed significant difference in 8 of the 10 factors examined. Finally, examining the difference in the effect of reducing subjective shoulder pain by gender and age, we observed that gender-based disability reduction was significant for all 12 factors examined. CONCLUSION: Taken together, the results of this study, validate the therapeutic efficacy of FAPT for patients with shoulder pain. We believe that this data will provide basic information to understand the health conditions and psychological variables of patients with shoulder pain.

• 부모자녀건강학회지
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• 제10권1호
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• pp.65-76
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• 2007

Purpose: This study was to determine the effects of a combined obesity management program in obese women. The study also attempted to measure the effects of the program on blood lipid, body mass index, dietary calory and dietary habit. Method: This research employed a one group pretest-posttest design. A total of 251 obese women(BMI: over 25) were selected for this research. The subjects in a combined obesity management program (combined exercise therapy and dietary therapy) for 8weeks. Results: After performing the program for 8 weeks, the result were follows. 1) There were significant reduction in total cholesterol(t=4.10, p= .00), triglyceride(t=5.09, p= .00) but no significant reduction BMI. 2) There were reduction in dietary calory, but no significantly. 3) There were significant increase in dietary habit. Conclusion: From these findings, it was confirmed that a combined obesity management program for obese women can decrease TC, TG, BMI and increase dietary habit. Therefore, this program can be utilized for various population groups including women, and further researches are required on program for men, elderly.

• 무역학회지
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• 제46권6호
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• pp.163-190
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• 2021

The paper studies the impulse buying behavior of Chinese consumers during the online shopping festivals of the specific situations and their influencing factors with empirical analysis. We carried out an empirical analysis on 302 Chinese consumers with shopping experience in the online shopping festival. The study result shows that (1) marketing stimulation, preferential promotion and features of consumers have a significant positive influence on the impulse buying behavior; while the freight reduction has no significant influence on impulse buying behavior; (2) the perceived value has a significant positive influence on the Chinese consumers to have impulse buying behavior; (3) perceived value works as an in the relationship between the marketing stimulation, preferential promotion and features of consumers and the impulse buying behavior, but it has no meditating role between the freight reduction and the impulse buying behavior.

• Journal of Korean Neurosurgical Society
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• 제67권2호
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• pp.202-208
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• 2024

Objective : Failed back surgery syndrome (FBSS) is a common long-term complication following spine surgeries characterized by chronic persistent pain; different strategies of management were employed to deal with it. This clinical trial aims to compare the efficacy of Pregabalin and Gabapentin in the management of this condition. Methods : A double-blind, randomized, comparative study (clinical trial registry NCT05324761 on 11th April 2022) with two parallel arms with Pregabalin and Gabapentin were used in arms one and two, respectively. Visual analog scale was used for basal and endpoint assessment of pain. T-test and analysis of covariance were used to deal with different variables. A pairwise test was used to compare pairs of means. Results : Of 66 patients referred to the trial, 64 were eligible, with 60 patients completing the 30 days trial. Both pregabalin and gabapentin effectively reduce pain, with significant p-values of 0.001 for each group. However, the pregabalin group was superior to gabapentin in pain reduction (p=0.001). Gender was an insignificant factor (p=0.574 and p=0.445 for the pregabalin and gabapentin groups, respectively, with a non-significant reduction (p=0.393) for both groups in total. Location of stenosis before surgery and type of surgery performed show non-significant effect on pain reduction for both groups. Conclusion : Both pregabalin and gabapentin effectively and safely relieve neuropathic pain associated with FBSS; pregabalin was significantly more effective irrespective of the patients' gender.