• International Journal of Quality Innovation
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• 제1권1호
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• pp.89-96
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• 2000

Evolutionary operation (EVOP) is a continuous improvement system which explores a region of process operating conditions by deliberately creating some systematic changes to the process variable levels without jeopardizing the product. It is aimed at securing a satisfactory operating condition in full-scale manufacturing processes, which is generally different from that obtained in laboratory or pilot plant experiments. Information on how to improve the process is generated from a simple experimental design. Traditional EVOP procedures are established on the assumption that the variance of the response variable should be small and stable in the region of the process operation. However, it is often the case that process noises have an influence on the stability of the process. This process instability is due to many factors such as raw materials, ambient temperature, and equipment wear. Therefore, process variables should be optimized continuously not only to meet the target value but also to keep the variance of the response variables as low as possible. We propose a scheme to achieve robust process improvement. As a process performance measure, we adopted the mean square error (MSE) of the replicate response values on a specific operating condition, and used the Kruskal-Wallis test to identify significant differences between the process operating conditions.

• 대한간호학회지
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• 제38권3호
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• pp.474-482
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• 2008

Purpose: The purposes of this study were; 1) to test the validity and reliability of the Korean version of Rantz's Observable Indicators of Nursing Home Care Quality Instrument (ONHQ) and 2) to evaluate the quality of Korean nursing homes. Methods: The study employed a three-phase methodological research design. 1) The original instrument of Rantz's. ONHQ was translated into Korean and modified by Korean nursing home experts. 2) A pilot study using the modified instrument was done in 20 nursing homes to examine inter-rater reliability. 3) The validity and reliability were tested.in 98 nursing homes. Results: Seven factors were extracted through factor analysis: 'communication', 'care delivery', 'grooming', 'odor, 'environment-basics', 'environment-access', and 'environment-homelike'. These factors explained 86.07% of the total variance. Cronbach's alpha coefficient of the 30 items was .97 indicating a high internal consistency of the instrument. Inter-rater reliability according to Kappa was .82. The average score of nursing home quality was 112.07 indicating an average range of quality level. Conclusion: The Korean version of the ONHQ was identified as a tool with a high degree of validity and reliability. This tool can be effectively used to assess the quality of nursing homes by professions as well as family members.

• 대한한방부인과학회지
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• 제30권4호
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• pp.149-174
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• 2017

Objectives: The aim of this study is to establish a base for further research by reviewing studies on electroacupuncture (EA) for stress urinary incontinence (SUI). Methods: Clinical studies concerning the effects of EA for SUI, were obtained from Cochrane Library, PubMed, CNKI, RISS, NDSL, KISS and OASIS. Results: Forty-five studies met the criteria, which included 33 RCTs, 1 pilot RCT, 4 non-randomized Clinical Trials, 6 Case studies and 1 Orthogonal design study with 3638 patients. There was only one article published in Korea. In these study, the most common primary outcome measurement was the pad test. Most of the studies showed the group treated by EA effects compared to the control group. Also, many interventions that combined with EA were found and all complex therapy group had significantly better than control group. 7 studies observed adverse events (AEs), four of which referred to EA related AEs among them. And 4 studies reported no AEs associated with EA. Conclusions: Despite several limitations, various studies to prove limited yet effective EA on SUI provides much significance. Subsequent studies conducted by the complementary systematic review of the studies and well-designed clinical trials using the methodological quality will be needed to more firmly validate the therapeutic effect of EA on SUI.

• 국제물리치료학회지
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• 제11권4호
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• pp.2237-2243
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• 2020

Background: The myofascial release technique is known to be an effective technique for increasing posterior fascia flexibility in short hamstring syndrome (SHS) subjects. But therapeutic mechanism of myofascial relaxation remains unclear. Recently, the theory of autonomic nervous system domination has been raised, however, a proper study to test the theory has not been conducted. Objectives: To investigate whether the application of the myofascial release technique can induce changes in the autonomic nervous system and affect the secretion of stress hormones and myofascial relaxation. Design: Quasi-experimental study. Methods: Twenty-four subjects with SHS were randomly divided into two groups. In the experimental group, the suboccipital muscle inhibition (SMI) technique was applied to the subjects for 4 min in supine position, and in the control group, the subjects were lying in the supine position only. A forward flexion distance (FFD) was conducted, blood pressure, heart rate, and cortisol levels were measured before and after the intervention and 30 min after intervention to determine myofascial relaxation and stress hormone levels. The evaluation was conducted separately in blind by an evaluator. Results: A FFD decreased in the experimental group, no change in cortisol was observed. On the contrary, a decrease in cortisol appeared in the control group after 30 minutes. Conclusion: The myofascial release technique is an effective treatment to increase the range of motion through posterior superior myofascial chain, but there is no evidence that myofascial release technique can control the autonomic nervous system.

• 청정기술
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• 제12권2호
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• pp.78-86
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• 2006

저발열량 석탄 및 바이오매스 합성가스의 가스 엔진 내 연소 특성에 대한 전산 해석을 수행하였다. 열화학적 해석을 통해 연소 압력, 연소 온도, 배기가스의 조성, NO 배출량 및 엔진 출력을 예측하였고, 예측결과를 소형 파이로트 가스 엔진 시험결과와 비교하였다. 합성 가스의 가스 엔진 연소실 내부의 비정상 연소 현상을 규명하기 위해 전산유체역학적 해석을 수행하였고, 석탄 및 바이오매스 합성가스의 계산결과들을 서로 비교하여 대체연료로서 합성가스 연소 시 가스엔진에 대한 설계 변경 및 조절을 위한 기준을 제시하였다.

• 한국조경학회지
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• 제17권3호
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• pp.1-8
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• 1990

The digital terrain model (DTM) or digital elevation model (DEM) is commonly used in representing the continuous variation of relief over space. One of the most frequent applications is to display the three dimensional view of the landform concerned. In this paper, the altitude matrices-regular grid cell format of the elevation in Mt. Kyeryong National Park were used in developing the three dimensional view software for the first time in Korea. It required the removal of hidden lines or surfaces. To do this, it was necessary to identify those surfaces and line segments that are visible and those that are invisible. Then, only the visible portions of the landform were displayed. The assumption that line segments are used to approximate contour surfaces by polygons was used in developing the three dimensional orthographic view. In order to remove hidden lines, the visibility test and masking algorithms were used. The software was developed in the engineering workstation, SUN 3/280 at the Institute of Space Science and Astronomy using 'C' in UNIX operating system. The software developed in this paper can be used in various fields. Some of them are as follows : (1) Landscape design and planning for identifying viewshed area(line of sight maps) (2) For planning the route selection and the facility location (3) Flight simulation for pilot training (4) Other landscape planning or civil engineering purposes

• 대한암한의학회지
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• 제27권1호
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• pp.37-48
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• 2022

Objective: Insomnia is a very common symptom and has a great effect on the quality of life in cancer patients. This study was conducted to identify the effects of the aroma therapy on insomnia in cancer patients. Methods: The study was performed with one group in before-after test design. The subjects were 15 cancer patients with insomnia selected by convenience sampling in Daegu. The aroma therapy consists of 10-minute sessions twice a week over 6 weeks. The PSQI (Pittsburgh Sleep Quality Index), ISI (Insomnia Severity Index) were measured at baseline and at 3 and 6 weeks, after 6 weeks after finishing treatment. STAI (State-Trait Anxiety Inventory), FACT-G (Functional Assessment Cancer Therapy-General), HRV (Heart Rate Variability) were measured at baseline, post-treatment and after 6 weeks after finishing treatments. Results: Fifteen patients (mean age 50.93 ± 7.29 years), with breast, ovarian or gastric cancer, participated this study. At post-treatment, PSQI (from 14.18 ± 2.64 to 6.18 ± 3.03), ISI (from 19.00 ± 3.19 to 8.18 ± 5.14), FACT-G (from 55.65 ± 11.20 to 66.91 ± 12.33), and STAI (from 40.36 ± 8.10 to 34.73 ± 9.81, from 45.64 ± 6.07 to 39.73 ± 9.37) scores improved significantly over baseline(p<0.001). Conclusion: Aroma therapy improved insomnia, anxiety and quality of life on cancer patients.

• 한국군사과학기술학회지
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• 제23권6호
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• pp.639-649
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• 2020

Air data systems measure airspeed, pressure altitude, angle of attack and angle of sideslip. These measurements are essential for operating flight control laws to ensure safe flights. Since the loss or corruption of air data measurements is considered as catastrophic, a high level of operational reliability needs to be achieved for air data systems. In the case of unmanned air vehicles, failure of any of air data sensors is more critical due to the absence of onboard pilot decision aid. This paper presents design of a dual redundancy air data system and the integration process for an unmanned air vehicle. The proposed dual-redundant architecture is based on two independent air data probes and redundancy management by central processing in two independent flight control computers. Starting from unit testing of single air data sensor, details are provided of system level tests used to meet overall requirements. Test results from system integration demonstrate the efficiency of the proposed process.

• 한국지반신소재학회논문집
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• 제20권3호
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• pp.1-10
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• 2021

본 연구는 성토구조체 현장실험을 통해 포항 지역의 제3기 이암을 도로 노체 재료로 활용하기 위한 가능성을 검토하는 제시하는 것이다. 이 이암은 신생대 제 3기층인 연암퇴적층에 분포하고 있는 미고결화 암석으로 슬레이킹, 팽윤 현상, 전단강도 저하와 같은 물리적 문제와 산성배수라는 화학적 문제가 발생한다. 여러 복합적 문제 해결하기 위해 실내 배합 시험을 진행하였으며 제 3기 이암(90%)과 복합슬래그(제강 70%, 고로 30%)와 중화·코팅제 처리의 최적 배합 조건을 도출했으며, 이를 실증하기 위해 실제 규모의 도로 성토구조체를 시공하여 구간별 현장 시험을 진행했다. 사전처리구간은 최적 배합 조건 설계로 인해 안정이 유지되는 반면, 무처리구간은 자연 풍화가 빠르게 진행되어 구조적 문제 발생이 우려되었으며, 가적치구간은 중화·코팅제 효과가 확인됨에 따라 임시 적치 시기에 적용 가능함을 확인했다.

• 한국정보시스템학회지:정보시스템연구
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• 제24권2호
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• pp.117-138
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• 2015

Purpose The number of Tablet PC users has recently increased in steep, which started to offer media companies more opportunities to enter into a new business field. Based on Information System Success model, this study finds that tablet magazine's quality factors influence perceived usefulness, user satisfaction and intention of continuous use. Design/methodology/approach We conducted a survey for 20-40's Tablet PC users. After pilot study, we analyzed the main survey data by using SPSS 18.0 and AMOS 18.0, and employed structural equation modeling to test the hypotheses. Findings Our research results are summarized as follows : First, information quality has a positive impact on user satisfaction, but not on perceived usefulness. Second, service quality has a positive impact on perceived usefulness, but not on user satisfaction. Third, perceived usefulness positively influences user satisfaction. Fourth, user satisfaction positively influences the intention of continuous use. In particular we found that Tablet PC usage experience had a moderating effect on the relationship between perceived usefulness and user satisfaction.