아크젯 플라즈마에서의 메탄 개질 특성

황나경(Na Kyung Hwang),이대훈(Dae Hoon Lee),송영훈(Yong-Hoon Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

A reaction mechanism of methane partial oxidation with arc plasma has been investigated. The reaction zone of arc plasma reactor can be divided into two zones, i.e. thermal and non-thermal plasma reaction zones. Test results shows that the most of the methane is decomposed in the thermal zone, which reveals that the present process is governed by thermal chemistry process induced by arc. It was observed that the H₂ selectivity in the non-thermal plasma zone is abnormally high, although the methane decomposition rate is relatively poor. This observation implies that the contribution of the non-thermal plasma to overall H₂ production is not negligible.

뇌졸중 재활의 조기퇴원지지(Early Supported Discharge) 서비스에 대한 고찰

황나경(Hwang, Na-Kyoung) 한국노인작업치료학회 2020 한국노인작업치료학회지 Vol.2 No.2

서론 : 본 연구는 조기퇴원지지 서비스와 그 효과성에 대해 고찰하고, 국내 뇌졸중 재활의료 현실에서 서비스도입의 필요성과 서비스 내 작업치료 접근 방향에 대한 기초자료를 제시하고자 하였다. 본론 : 조기퇴원지지는 뇌졸중 재활의료의 체계가 선진화된 여러 국가에서 시행되는 제도로 재활과 사회 자원에 대한 서비스를 병원에서 지역 사회 환경으로 조기 전환하는 것에 그 목적을 두고 있다. 경증에서 중등증 뇌졸중 환자를 서비스 대상으로 하며 환자는 조기퇴원 후 가정에서 병원과 유사한 정도의 재활서비스를 제공받는다. 선행연구들을 통해 조기퇴원지지 서비스의 의학적 효과성과 개인적, 사회적 부담을 감소시키는 비용 효율적 중재임이 보고되어 왔다. 가정과 지역사회 복귀가 가능한 경증, 중등증 환자들이 지속적으로 병원 입원을 통해 재활치료를 받고 있는 국내 뇌졸중 재활의료 현실에서 조기퇴원지지서비스는 효율적 재활의 료자원 이용과 재활의료전달체계 구축을 위한 하나의 재활의료 모델이 될 수 있다. 결론 : 향후 국내 재활의료 현실에 적합한 뇌졸중 환자의 조기퇴원지지 서비스 시범사업과 이를 통한 효과성 검증 연구가 필요할 것이다. 또한 조기퇴원지지의 근간인 가정방문재활서비스 중 현재 제도적 미비로 확립되지 못하고 있는 국내 방문작업치료 서비스에 대한 학술, 정책적 노력을 위한 논의들이 활성화될 필요가 있음을 제언한다. Introduction : This study aimed to review early supported discharge (ESD) and its effectiveness, and present the necessity of implementing an ESD service in the reality of domestic stroke rehabilitation medicine healthcare and the direction of occupational therapy approaches in ESD. Body : The ESD is a system implemented in various countries with advanced stroke rehabilitation medicine healthcare systems, and aims at early transition of rehabilitation and social resource services from the hospital to the community environment. It targets patients with mild to moderate stroke, and these patients receive rehabilitation services similar to those at home after early discharge. Previous studies have reported that ESD is a cost-effective intervention. It has medical effectiveness and reduces personal and social burdens. For patients with mild and moderate stroke can return home and to the community continuously receive rehabilitation treatment through hospital admission, ESD can be a rehabilitation healthcare model for efficient use of resources and establishment of rehabilitation medicine healthcare delivery systems. Conclusion : Pilot projects of ESD suitable for domestic rehabilitation medicine healthcare and studies to verify its effectiveness through these projects will be needed. In addition, it is suggested that discussions on academic and policy efforts for domestic home-visit occupational therapy service, which is currently not established due to institutional deficiencies, be activated.

뇌졸중 및 노인 환자의 퇴원 평가도구에 대한 체계적 고찰

황나경(Hwang, Na-Kyoung),유은영(Yoo, Eun-Young) 대한신경계작업치료학회 2020 재활치료과학 Vol.9 No.3

Objective : The aim of this systematic review is to analyze the assessment items and tools used for the discharge of stroke and elderly patients and to help select appropriate assessment tools for discharge planning. Methods : The studies included in this review were collected from the PubMed, Medline Complete (EBSCOhost), and Scopus databases from January 2009 to December 2018. A total 22 studies were selected. The research types, the areas and sub-areas of assessment, as well as the assessment tools according to the areas were analyzed. Results : Descriptive research (59.2%) was the most frequent type of research. The 12 main areas of assessment were medical condition, activities of daily living, swallowing function, sensation, mobility, cognition and perception, communication, emotion, home environment, patient knowledge and readiness for discharge, social support, and well-being. Among the assessment tools, the most frequently used tools were Bathel Index; Functional Independence Measure, to assess activities of daily living; Short-Form Health Survey, to assess well-being, and Timed Up and Go test, to assess mobility. Conclusion : This study will help select the assessment areas and tools to be considered at discharge of stroke patients and serve a basis for the development of comprehensive assessment tools for discharge planning. 목적 : 본 연구는 뇌졸중 환자와 노인 환자를 대상으로 퇴원 시기에 이루어지는 평가도구에 대한 체계적문헌고찰을 통해 평가 항목과 평가도구들을 분석하여 효율적인 퇴원계획을 위한 기초자료를 제공하고자한다. 연구방법 : 문헌 선정은 PubMed, Medline Complete(EBSCOhost), Scopus를 사용하여 2009년 1월부터2018년 12월까지의 온라인 데이터에 등록된 연구를 대상으로 최종 22편의 연구를 선정하였고, 연구설계 및 퇴원 시 주요 평가영역, 하위영역, 평가도구들을 분석하였다. 결과 : 선택된 연구들의 연구 설계 형태는 기술적 연구가 13편(59.2%)으로 가장 많았다. 퇴원 시 평가영역은 의학적 상태, 일상생활활동, 삼킴 기능, 감각, 이동성, 인지·지각, 의사소통, 감정상태, 가정환경, 환자의 지식과 퇴원을 위한 준비, 사회적지지, 안녕감 등 12개 영역으로 나타났다. 평가 영역에 따라 사용된 평가도구를 분석한 결과, 가장 높은 빈도의 사용을 보이는 평가도구는 일상생활활동을 평가하는 Barthel Index, Functional Independence Measure, 안녕감을 평가하는 Short Form Health Survey, 이동성을 평가하는 Timed Up and Go test 등으로 나타났다. 결론 : 본 연구를 통해 뇌졸중, 노인 환자의 퇴원 시 이루어지는 다양한 평가 영역과 평가도구의 사용과 제한적이나 여러 영역을 포괄하는 평가도구들을 확인할 수 있었다. 이는 뇌졸중 환자의 퇴원 시 고려되는 평가 영역과 효과적인 평가도구의 선택을 돕고 적절한 퇴원계획 중재와 제안을 위한 포괄적인 평가도구의 개발의 기초자료가 될 것이다.

병원급 의료기관에서 근무하는 작업치료사의 소진 경험에 대한 현상학적 연구

황나경(Hwang, Na-Kyoung),정민예(Jung, Min-Ye) 대한신경계작업치료학회 2020 재활치료과학 Vol.9 No.4

목적 : 본 연구는 현상학적 연구방법을 통해 병원급 의료기관에서 근무하는 작업치료사의소진의 본질을탐구함으로써 소진을 완화하기 위한 방법을 개발하는데 필요한 기초자료를 제공하고자 한다. 연구방법 : 병원급 의료기관에서 근무하는 작업치료사 6명을 대상으로 8주간 심층면담을 실시하였다. 면담자료는 Colaizzi의 현상학적 연구방법을 통해 분석하였고, 자료 전사 및 주제생성과, 범주화 과정에파랑새 2.0 소프트웨어를 사용하였다. 결과 : 수집된 자료를 통해 14개의 주제, 9개의 주제모음, 3개의 범주를 도출하였다. 분석 결과, 소진의원인은 병원 작업치료 업무에서 오는 소진, 업무 환경에서 오는 소진 등으로 확인되었고, 소진이 개인의삶에 미치는 영향은 내면 심리변화와 타인에 대한 영향이었다. 소진에 대한 대처 전략으로는 개인 삶의풍요화, 자기 인식과 철학, 인식적 접근, 사회적 지지, 삶의 새로운 목표 설정 등으로 나타났다. 결론 : 반복되는 재활과정에서 오는 타성과 치료 효과에 대한 확신 부재에서 경험하는 직업 정체성 갈등을해결하고 작업치료의 가치 제고를 위한 자생적 노력이 필요함을 제언한다. 또한 소진예방을 위한조직 차원의 규정 및 교육 프로그램 마련과 수평적인 인간관계를 지향하는 조직문화의 확립이필요할 것이다. Objective : This study aimed to understand the burnout experience of hospital occupational therapists through phenomenological research. Methods : We conducted in-depth interviews with 6 occupational therapists working at hospital for 8 weeks. The data were analyzed using the Palangsae 2.0 software to derive meaning through the process of transcription and data entry, coding, and topic creation. Results : From the collected data, 14 sub-themes, 9 theme clusters, 3 categories were identified. The cause of burnout was confirmed as being due to therapy-related work and workplace conditions. The impacts of burnout on individual life were psychological in nature and also included being an adverse, influence on others. The coping strategies to deal with burnout were enrichment of personal life, self-awareness and philosophy, conscious approach, social support, and setting new goals for life. Conclusion : We suggest that spontaneous efforts are needed by occupational therapists in order to alleviate the conflicts of job identity. In addition, organizational regulations and programs and the establishment of horizontal organizational cultures are required to overcome and prevent burnout of occupational therapists.

국내 작업치료사의 퇴원계획 개입에 대한 실태 조사연구

황나경(Hwang, Na-Kyoung),유은영(Yoo, Eun-Young) 대한신경계작업치료학회 2020 재활치료과학 Vol.9 No.2

목적 : 본 연구는 환자의 퇴원계획에 대한 작업치료사 개입의 필요성과 퇴원 스크리닝과 계획을 위해고려되어야할 영역을 조사함으로써 효과적인 퇴원계획 실행을 위한 퇴원평가도구의 개발의 기초 자료를제공하고자 실시되었다. 연구방법 : 연구 참여에 동의한 의료기관에서 근무하는 작업치료사 60명을 대상으로 온라인 설문 조사를실시하였다. 설문 내용은 일반적 특성, 퇴원계획 현황, 퇴원평가와 퇴원계획 필요성, 총 36문항으로구성되었다. 수집된 자료는 SPSS 20.0 프로그램을 이용하여 기술통계, 독립표본 티 검증, 일원배치분산분석, 사후검증은 쉐페 검증으로 분석하였다. 결과 : 퇴원계획과 준비에 대한 작업치료사의 역할과 퇴원평가도구의 필요성에 대한 인식은 높게 나타났으나, 작업치료사의 퇴원 관련 지식 및 정보 보유에 대한 인식 정도는 낮은 것으로 조사되었다. 퇴원계획중재 시 겪게 되는 어려움은 면담과 평가를 위한 적절한 수가의 부재, 퇴원계획을 위한 팀 접근의 부족, 퇴원계획을 위한 적절한 평가도구의 부재에 대한 응답이 높게 나타났다. 퇴원 시 평가의 필요성이 높은영역은 낙상위험과 BADL수행으로 나타났으며, 평가의 필요성이 낮은 영역은 안녕감과 발병 전 기능수준으로 나타났다. 결론 : 본 연구를 통해 퇴원계획에 대한 작업치료사 개입의 필요성을 파악할 수 있었으며, 향후 효과적인퇴원계획 실행을 위한 퇴원평가도구 개발의 기초자료가 될 것으로 사료된다. Objective : The purpose of this study was to investigate the necessity of occupational therapist’s involvement in patient discharge planning, the areas that should be considered for discharge screening and planning, and to provide the basic data required for the development of a discharge assessment tool. Methods : We conducted an online questionnaire survey of 60 occupational therapists who were working at medical institutions and had agreed to participate in the study. The questionnaire was composed of 36 questions regarding the general characteristics of the current discharge planning process and the necessity of discharge assessment and planning. Descriptive statistics, an independent t-test, and a one-way ANOVA were conducted using SPSS 20.0. As for the post-hoc test, Scheffe’s test was used. Results : The awareness of occupational therapist s role in discharge planning and the necessity of a discharge assessment tool were high, but the occupational therapist s awareness of discharge-related knowledge was low. The difficulties in discharge planning showed high response rate in the absence of adequate fee-for-service in the patient interview and assessment and the lack of team approach and appropriate assessment tools for discharge planning. The high-needs areas for evaluation during discharge were fall risk and BADL, and the low-needs areas were well-being and functional level prior to onset. Conclusion : This study is expected to provide preliminary information necessary for the development of a discharge assessment tool for effective discharge planning.

아크제트 플라즈마에서의 메탄 건식 개질의 특성

황나경(N. K. Hwang),차민석(M. S. Cha),이대훈(D. H. Lee),김관태(K. T. Kim),이재옥(J. O. Lee),송영훈(Y.-H. Song) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-

The reaction mechanism of methane dry reforming has been investigated using an arc-jet reactor. The effects of input power, CO₂ /CH₄ and added O₂ were investigated by product analysis, including CO, H₂, C₂HY and C₃HY as well as CH₄ and CO₂. In the process, input electrical power activated the reactions between CH₄ and CO₂ significantly. The increased feed ratio of the CO₂ to CH₄ in the dry reforming doesn't affect to the CH₄ conversion but increase the selectivity of CO with suppressing the reaction of H₂ generation. Added oxygen can also increase not only CO selectivity but also CH₄ conversion, For more understanding these results. the reaction has been compared with thermo-equilibrium calculation.

대기압 플라즈마를 이용한 메탄의 건식개질과 부분산화반응의 비교

황나경(Na Kyung Hwang),차민석(Min Suk Cha),이대훈(Dae Hoon Lee),송영훈(Young-Hoon Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Plasma techniques have been proposed to generate a hydrogen enrich gas to investigate a feasibility of plasma techniques on a fuel reforming, we considered a dry reforming and a partial oxidation with methane in the atmospheric pressure. For these experiments, we employed an arc jet plasma reactor. The effects of input power and oxidizer in each process were investigated by product analysis, including carbon monoxide, hydrogen, ethylene, propane, and acetylene as well as methane and carbon dioxide. In both processes, input electrical power activated the reactions significantly. The increased ratio of the carbon dioxide to methane in the dry reforming doesn't affect to a methane conversion, whereas increased ratio of oxidizer to methane in the partial oxidation was very effective for the reaction. Moreover, for a simultaneous treatment of methane and carbon dioxide, a feasibility of a dry reforming combined with partial oxidation also has been investigated

메탄개질에서의 아크젯 플라즈마의 역할

황나경(Na kyung Hwang),이대훈(Dae Hoon Lee),송영훈(Young-Hoon Song) 한국연소학회 2006 한국연소학회지 Vol.11 No.3

A reaction mechanism of methane partial oxidation, which consists of thermal and plasma chemistry reaction pathways, has been investigated using with an arc-jet reactor. The reaction zone of the arc-jet reactor is spatially separated into thermal and non-thermal plasma zone. Methane conversion rates, selectivity of H₂ and C₂ chemicals in each zone are obtained, which reveals clearly different characteristics of reaction pathways depending on the temperature conditions. The conversion rates obtained in thermal plasma zone is higher than those in non-thermal plasma zone. The selectivity, however, obtained in non-thermal plasma zone is significantly higher than those in thermal plasma zone. Further parametric study on O₂/C ratio, arc length and SED shows that the present process is mainly governed by thermal chemistry pathways.

플라즈마 개질기에서 방전전력 특성에 따른 개질 결과

황나경(Nakyung Hwang),허민(Min Hur),김관태(Kwan Tae Kim),이재옥(Jae Ok Lee),이대훈,송영훈(Young-Hoon Song) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

In an arc jet reactor, the influence of voltage-current characteristics on the reforming performance was compared between the partial oxidation reaction and CO₂ dry reforming. The reforming performance was evaluated in terms of the CH₄ conversion, selectivity, and efficiency. In the partial oxidation reaction, the reforming performance was little influenced by the voltage-current characteristics, of which effect on the reforming performance was, however, great in the CO₂ dry reforming. At a same power, high voltage-low current operation attained higher CH₄ conversion than low voltage-high current operation, whereas the latter achieved higher selectivity than the former. It was derived from this result that the non-equilibrium effect caused by high voltage operation plays an important role in determining the plasma chemistry in the CO₂ dry reforming whereas the reaction heat governs the reforming performance in the partial oxidation reaction.

증례 : 순환기 ; B형 벽내 혈종에서 심낭압전과 심막염

황나경 ( Nakyoung Hwang ),박진섭 ( Jin Sup Park ),차광수 ( Kwang Soo Cha ),김은희 ( Eun Heui Kim ),한성용 ( Sung Yong Han ),강진숙 ( Jin Suk Kang ) 대한내과학회 2015 대한내과학회지 Vol.89 No.6

We report the case of a patient with cardiac tamponade and pericarditis in type B intramural hematoma. A 75-year-old woman was admitted to the emergency department presenting with general weakness and dizziness for several hours and hemodynamic collapse. Thoracic echocardiography and computed tomography (CT) showed a large pericardial effusion and aortic intramural hematoma but no evidence of aortic dissection. Therefore, we concluded that the intramural hematoma did not involve the ascending aorta and thus immediately performed pericardiocentesis. Follow-up CT showed no pericardial effusion or specific changes in the range or depth of the intramural hematoma, and she was discharged continuing colchicines and ibuprofen therapy for acute pericarditis. Cardiac tamponade in type B intramural hematoma is extremely rare. Prompt diagnosis and initial treatment resulted in a substantial improvement in clinical status. (Korean J Med 2015;89:695-698)