• 청정기술
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• 제9권2호
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• pp.71-79
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• 2003

화력발전소에서 배출되는 질소산화물 제어를 위한 선택적 촉매 환원 공정은 안정적이며 고효율 설계가 가능하여 범용적으로 사용되고 있는 기술이다. 선택적 촉매 환원 공정의 최적 설계를 위해서는 촉매 특성에 따른 설계기술이 정립되어야 하며, 다양한 조건에 대한 설계경험이 필요하다. 본 연구에서는 SCR 공정의 설계자료 도출을 위해 설계/제작된 $1,000Nm^3/hr$급 SCR 파일럿 플랜트를 이용하여 반응온도, $NH_3/NO$ 몰비, 공간속도, 선속도 및 압력손실 등의 설계변수에 대한 성능실험을 수행하고, 도출된 실험 결과를 통한 설계과정을 기술하였다.

• Hip & pelvis
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• 제35권4호
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• pp.217-227
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• 2023

Purpose: Periprosthetic femoral fracture (PFF) is a common complication after total hip arthroplasty, and open reduction and internal fixation (ORIF) is a common surgical treatment. We conducted a meta-analysis to compare the outcomes of ORIF in patients with different fracture patterns (Vancouver B1 and B2). Materials and Methods: We conducted a systematic search of PubMed, Embase, Cochrane Library and KoreaMed from inception to August 2022. We conducted a pair-wise meta-analysis (with a fixed-effects model) on the 10 comparative studies and a proportional meta-analysis on the data from the 39 articles to determine a consensus. The outcomes were the incidence of reoperations that included osteosynthesis, irrigation/debridement and revision arthroplasty. Results: The pair-wise meta-analysis showed similar outcomes between two groups; the risk of reoperation (odds ratio [OR]=0.82, confidence interval [CI] 0.43-1.55, P=0.542), nonunion (OR=0.49; CI 0.22-1.10, P=0.085) and deep infection (OR=1.89, CI 0.48-7.46, P=0.361). In proportion meta-analysis, pooled prevalence of reoperation was 9% (95% CI, 6-12) in B1 and 8% (95% CI, 2-15) in B2 (heterogeneity between two groups (Q), P=0.772). The pooled prevalence of nonunion was same as of 4% in B1 and B2 (Q, P=0.678), and deep infection was 2% (95% CI, 1-3) in B1 and 4% (95% CI, 2-7) in B2 (Q, P=0.130). Conclusion: ORIF is a feasible treatment for B1 and B2 periprosthetic femoral fractures, with acceptable outcomes in terms of, nonunion and infection. The results of this study would help clinicians and provide baseline data for further studies validating PFF.

• 척추신경추나의학회지
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• 제15권1호
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• pp.35-48
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• 2020

Objectives : This study was conducted to evaluate the therapeutic effects of Chuna Craniosacral therapy on headaches. Methods : 1. A combination of keywords, such as headache and Chuna Craniosacral therapy, were searched based on studies published in 11 databases (Pubmed, CAJ, EMBASE, Cochrane Library, Web of Science, KMBASE, KISS, KISTI, NDSL, RISS and DBPIA) up to October 31st, 2019. 2. The subjects were randomized controlled clinical studies using Chuna Craniosacral therapy. 3. We used the Cochrane perverse assessment tools for quality assessment. Results : 1. Six randomized controlled clinical studies were selected, and all 404 patients were evaluated. 2. As a result of the meta-analysis, Chuna Craniosacral therapy and scalp acupuncture showed no difference in treatment effect. 3. Chuna Craniosacral therapy showed a significant difference in treatment effect compared to Maitlands mobilization. 4. Chuna Craniosacral therapy showed a partial difference in treatment effect compared to low intensity magnetotherapy. 5. Chuna Craniosacral therapy group showed a significant effect on pain reduction compared to the untreated group. 6. All six papers showed a high degree of bias risk, with no mention of side effects or adverse events. Conclusion : This study provided only a limited assessment of the curative effects of Chuna Craniosacral therapy's headache treatment. However, there was no mention of side effects, and given the therapeutic effects analyzed in individual papers, it is believed that Craniosacral therapy can be used safely to treat headaches.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.692-700
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• 1996

The objective of this study is to develop a systematic purification plant using the metabolism of aerobic microorganisms. This system is subsequently aerated and continuously removes suspended solids and settling sludges caused by aerating pressure at the bottom of a lower pipe (i.e., Continuous Removal of Suspended solids and Settling sludges, CRSS). The CRSS plants are brought out by introducing fine air bubbles into the liquid phase of a lower pipe in the bio-reactor. These plant uses aeration pipe, with multiple inlets to sweep the floor of bio-reactor tank, instead of the conventional scraper mechanisms. The principal advantage of this system is that it can continuously remove very small or light particles that settles completely within a short time. Once the particles have been floated to the surface, they can be moved into the pipe and collected in the settling tank by sequently aerated pressure. The experimental results shows that about 99.0% of the biochemical oxygen demand(BOD), 99.3% of the suspended solid(SS), 92.3% of the total nitrogen(T-N), 99.0% of the turbidity(TU), 100% of the total coliform(TC)and ammonia was respectively removed during aerobic digestion for 9 days. These result indicates that the CRS S plants are very effective for reduction and deodorization of swine wastewater contaminants, and the efflux from CRS S can either be discharged in the river or used as nutrient solution of formulation for plant growth factories. The developed CRSS plant proved to be flexible and it can simply be adapted to any type of biological waste treatment problem.roblem.

• 한국융합학회논문지
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• 제12권8호
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• pp.171-177
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• 2021

동남권 경제구역은 중소·중견 제조업 중심이었으나 산업변화와 코로나19로 지역경제 침체의 원인이 되었다. 본 연구는 동남권 지역경제 활성화를 위해 항공특화산업과 연관 기업들의 애로사항 제시 및 지역 경제 활성화 방안을 제시 하였다. 첫째, 항공특화부품 기업들은 수동적인 산업의 구조적 문제를 개선하기 위해 다양한 지원이 필요하다. 둘째, 동 산업 분야는 국제적 표준에 부합하는 제품과 기술을 개발하고 체계적 프로젝트 수행을 위해 전문 인력을 양성하여 안정적인 인력 수급을 지원하도록 국제적 인증 교육을 수행하는 체계적 교육시스템이 필요하다. 셋째, 동 산업분야는 고도의 표준화 기준을 충족시킬 수 있는 기술 및 제품 개발을 위해 정부의 재정적, 행정적 지원이 필요하다. 이외에도 중소·중견기업들의 거래처 발굴과 확대, 원가절감을 위한 투자지원 등 기업이 안고 있는 한계와 애로사항을 체계적으로 개선하기 위한 지원이 필요하다.

• 대한간호학회지
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• 제52권1호
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• pp.4-23
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• 2022

Purpose: The aim of this study was to evaluate the effect of auriculotherapy on musculoskeletal pain in adults. Methods: A total of 885 studies were retrieved from nine databases (PubMed, Scopus, CINAHL, Web of Science, Ovid Medline, Cochrane Library, RISS, KMbase, and KISS). Sixteen studies were selected for meta-analysis, which satisfied the inclusion criteria and the evaluation of risk of bias. Demographic data, auriculotherapy types, intervention characteristics, auricular points, and outcomes related to pain (subjective pain scale, and amount of analgesic) were extracted from all included studies. The effect size of auriculotherapy was analyzed through comprehensive meta analysis 3.0, and the presence of publication bias was analyzed through a funnel plot and Egger's regression. Results: The results of the meta-analysis (n = 16) revealed that the auriculotherapy was significantly superior to the control group on present pain in adults (Hedges' g = - 0.35, 95% Confidence Interval [CI] = - 0.55~- 0.15). According to the results of subgroup analysis, the effect size of auricular acupuncture therapy (Hedges' g = 0.45, 95% CI = - 0.75~- 0.15) was higher than the auricular acupuncture (Hedges' g = 0.27, 95% CI = - 0.53~0.00): the longer the intervention period, the greater the effect size. Conclusion: In this study, auriculotherapy demonstrates a significant reduction in musculoskeletal pain in adults. Therefore, it is necessary to refine the curriculum to include auriculotherapy as a nursing intervention to relieve musculoskeletal pain in adults and encourage its use in clinical settings.

• 시스템엔지니어링학술지
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• 제19권2호
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• pp.59-73
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• 2023

Due to the steady growth of the online shopping market and contact-free consumption, the volume of parcels in South Korea continues to increase. However, there is a lack of manpower for delivery workers to handle the growing parcel volume, leading to frequent accidents related to delivery work. As a result, the government and local authorities strive to enhance last-mile logistics efficiency. As one of these measures, unmanned parcel storage lockers are installed and utilized to handle last-mile deliveries. However, the existing parcel storage involves the inconvenience of couriers having to put each parcel in each locker, and this is somewhat insufficient to relieve the workload of delivery workers. In this study, we propose parcel storage devices that use active loading technology to minimize the workload of delivery workers, extract operation risk factors to apply this system to actual sites, and establish risk reduction methods based on the ALARP concept. Through this study, we have laid the groundwork for improving the safety of the system by identifying and proposing mitigation measures for the risk factors associated with the proposed parcel storage devices utilizing active loading technology. When applied in practical settings in the future, this foundation will contribute to the development of a more efficient and secure system. By applying the ALARP concept, a systems engineering technique used in this research, to the development and maintenance of storage devices leveraging active loading technology, it is thought to make the development process more systematic and structured. Furthermore, through the risk management of the proposed system, it is anticipated that a systematic approach to quality management can be employed to minimize defects and provide a stable system. This is expected to be more useful than the existing unmanned parcel storage devices.

• 한국안전학회지
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• 제39권1호
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• pp.41-54
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• 2024

Efforts to reduce on-site safety incidents have expanded, leading to active research in this domain. However, a systematic analysis to improve the utility of technology is lacking. In this study, we conducted a survey on the various institutional and technical improvement measures to promote the application of smart construction safety technology over three years after the implementation of the "Smart Safety Equipment Support Project." The results showed that financial constraint was the primary obstacle in the adoption of this innovation. Fostering a flexible environment in the utilization of management fees and financial support of projects was determined to aid in the extensive application of the technology. Ensuring cost efficiency and user-friendliness were principally necessary for technical enhancements in the smart construction safety technology. Technologies, such as VR/AR safety education, real-time location tracking, wearable devices, and innovation on streamlining safety-related work efficiency, had been anticipated to contribute to on-site safety. Operating a smart safety control center was expected to be beneficial in the systematic securing of data and reduction of safety blind spots. Effective methods had been suggested to overcome the barriers that hindered the development and application of smart construction safety technology. This study facilitates in the technological improvements in this field.

• 한국환경보건학회지
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• 제41권6호
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• pp.425-437
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• 2015

Objectives: Risk assessment is a tool for predicting and reducing uncertainty related to the effects of future activities. Probability approaches are the main elements in risk assessment, but confusion about the interpretation and use of assessment factors often undermines the message of the analyses. The aim of this study is to provide a guideline for systematic reduction plans regarding uncertainty in risk assessment. Methods: Articles and reports were collected online using the key words "uncertainty analysis" on risk assessment. Uncertainty analysis was conducted based on reports focusing on procedures for analysis methods by the World Health Organization (WHO) and U.S. Environmental Protection Agency (USEPA). In addition, case studies were performed in order to verify suggested methods qualitatively and quantitatively with exposure data, including measured data on toluene and styrene in residential spaces and multi-use facilities. Results: Based on an analysis of the data on uncertainty, three major factors including scenario, model, and parameters were identified as the main sources of uncertainty, and tiered approaches were determined. In the case study, the risk of toluene and styrene was evaluated and the most influential factors were also determined. Five reduction plans were presented: providing standard guidelines, using reliable exposure factors, possessing quality controls for analysis and scientific expertise, and introducing a peer review system. Conclusion: In this study, we established a method for reducing uncertainty by taking into account the major factors. Also, we showed a method for uncertainty analysis with tiered approaches. However, uncertainties are difficult to define because they are generated by many factors. Therefore, further studies are needed for the development of technical guidelines based on the representative scenario, model, and parameters developed in this study.

• 한국산학기술학회논문지
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• 제21권3호
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• pp.147-155
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• 2020

본 연구의 목적은 노인요양기관의 욕창발생 위험요인과 욕창예방 관리에 대한 내용을 비교. 분석하여 노인요양기관에 적합한 욕창예방 관리 방법을 위한 기초자료를 제공하고자 하였다. 본 연구는 체계적 문헌고찰과 포커스그룹 인터뷰를 활용한 혼합연구로 체계적 문헌고찰은 PRISMA(Preferred reporting items for systematic reviews) 지침에 따라 자료를 수집하고 분석하였으며, 포커스그룹 인터뷰는 노인요양기관에서 3년 이상 근무한 경력직 간호사를 대상으로 시행하였다. 쳬계적 문헌고찰은 2010년부터 2019년 6월까지 국내외에서 발표된 논문을 본 연구의 논문 선정기준에 따라 총 8편 논문이 선택하였다. 논문검색어는 'pressure ulcers', 'bedsore', 'decubitus ulcers', 'intervention','prevention', 'elderly', 'long term' 단어를 조합하여 검색하였다. 포커스그룹 인터뷰는 노인요양기관에 3년 이상 근무한 간호사를 대상으로 반 구조화된 설문지를 통해 내용분석을 하였다. 연구결과 노인요양기관의 경우 특히 체위변경과 압력 감소 장치를 적용한 중재가 욕창 예방관리에 중요한 중재임이 확인되었고 기관마다 표준화된 욕창간호 관리프로토콜 및 프로그램의 활용이 필요하다고 제시되었다. 본 연구는 혼합연구방법을 통해 욕창 예방관리 방법을 통합적으로 제시하였으며 특히 다학제간 협력이 노인요양기관의 중요한 이슈임이 확인되었다.