• 한국환경과학회지
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• 제4권3호
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• pp.153-167
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• 1995

Recycling is receiving increasing social attention today as our nation begins to grapple with the significant problems caused by huge amount of municipal solid waste. The topic of recycling is not simple but extremely complicated. This study attempts to provide basic data and policy options for expanding and improving separated collection and recycling in public residential areas, through three case study of apartment housing areas in Taegu Metropolitan City. The main results of this study are summarized as follows. For the significant period of time, all three case areas had in common the extreme difficulty in establishing and operating the system of connecting public participation, collection and storage, transportation, and actual recycling of materials because of a variety of problems involved in this process. Both amounts of and prices for collected materials fluctuated considerably over time mainly due to monthly changes in recyclable home materials and the dynamic nature of recycling markets. Public questionnaire survey revealed the very high level of participation in separated collection, not only because almost all respondents well understood the necessity and importance of recycling, but because they also knew how to do separated collection. But overall activities were rated low and most respondents suggested the enlargement of public participation, the improvement of collection and storage facilities, and collection transportation networks. In particular, most respondents had little experience of using recycled Products and used mainly reproduced soap and bathroom tissue. Furthermore, they were considerably unsatisfied with low variety and quality of recycled products, their high prices and low availability in the market. Finally potential policy options and activities for improving separated collection and recycling are suggested.

• 한국정보통신학회논문지
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• 제20권12호
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• pp.2206-2212
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• 2016

액체의 특성을 분류하기 위해서는 액상 물질의 유전율의 차이 등에 따른 특징적인 현상들을 파악하여야 한다. 이러한 현상들을 원격으로 탐지하여 추출할 수 있다면 폭발 가능성이 있는 위험물질의 검색이나 액체의 종류 등을 파악하는데 유용하게 활용할 수 있을 것이다. 따라서 본 논문에서는 광대역 전자파 신호를 이용하여 액체의 반사 및 투과신호를 하나의 송신 안테나와 2개의 수신 안테나에서 획득하여 분석하였다. 반사 또는 투과신호는 액체의 종류에 따라 주파수별 응답특성이 다르게 나타난다. 그러나 기존의 FFT 스펙트럼 추정방식은 주파수 해상도 문제 및 윈도잉에 의한 왜곡 때문에 적용하기 어렵다. 따라서 이러한 문제들을 최소화할 수 있는 고유벡터 해석 기법을 이용한 고해상도 스펙트럼 추정 및 분석 방법을 적용하였다. 이렇게 얻어진 결과들로부터 투과 또는 반사경로 들에 따른 액체의 종류별 첨두치 주파수들 및 대응전력 값들을 비교함으로서 다양한 액체들의 분류가 가능함을 보였다.

• 한국수소및신에너지학회논문집
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• 제33권5호
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• pp.574-582
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• 2022

A lithium-ion battery exhibits high energy density but has many limitations due to safety issues. Currently, as a solution for this, research on solid state batteries is attracting attention and is actively being conducted. Among the solid electrolytes, sulfide-based solid electrolytes are receiving much attention with high ion conductivity, but there is a limit to commercialization due to the relatively high price of lithium sulfide, which is a precursor material. This study focused on the possibility of relatively inexpensive and light lithium hydride and conducted an experiment on it. In order to analyze the characteristics of LiAlH₄, ion conductivity and thermal stability were measured, and a composites mixed with PVDF, a representative polymer electrolyte, was synthesized to confirm a change in characteristics. And metallurgical changes in the material were performed through XRD, SEM, and BET analysis, and ion conductivity and thermal stability were measured by EIS and LFA methods. As a result, Li₃AlH₆ having ion conductivity higher than LiAlH₄ is formed by the synthesis of composite materials, and thus ion conductivity is slightly improved, but thermal stability is rapidly degraded due to structural irregularity.

• Journal of Chest Surgery
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• 제32권3호
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• pp.215-223
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• 1999

배경: 여러 가지 다양한 원인에 의해 기도 협착이 초래된 경우, 단단문합이 가능한 병변을 제외하고는, 기관을 대치할 수 있는 여러 가지 대용물이 고려되고 임상에서도 이용되고 있으나 아직 만족스러운 결과는 보고되고 있지 않다. 이러한 이유로 비가역적 손상을 받은 다른 장기 \ulcorner마찬가지로 기관의 이식술이 고려되고 공여 기관의 자원의 제한으로 인하여 장기간 기관의 보관이 필요하게 되었다. 이에 쥐를 이용한 기관의 이소이식술을 통하여 기관 이식의 임상 적용 가능성 및 초냉동 보관을 통한 장기간 보관의 실험 모델의 정립 및 형태학적 측면에 대한 연구를 시행하였다. 대상 및 방법: 30마리의 Wistar쥐에서 60개의 기관 절편을 취득하여 20마리의 Wistar쥐와 40마리의 Sprague Dawley쥐들의 복부 복강내에 이소 이식하였다. 이식 동물 대상에 따라 실험군은 모두 6개의 군으로 나누었다. I, II, III군은 기관 절편을 취득후 곧바로 이식한 군들이며, IV, V, IV군은 기관 절편을 1개월간 -196$^{\circ}C$에서 초냉동 보관시킨 다음 이식한 군들이다. I군과 IV군은 동인자형 대조군으로 이식 대상 쥐는 공여 쥐와 같은 Wistar쥐였으며 면역억제제를 투여하지 않았다. II군과 V군은 이인자형 이식군으로 모두 Sprague-Dawley쥐로서 면역억제제를 투여하지 않았고, III군과 VI군도 마찬가지로 이인자형 이식군이었으나 면역억제제를 투여하였다. 모든 쥐는 이식술후 28일째 절명시키고 이소 이식된 기관 절편을 분리하여 조직학적 검사를 시행하였다. 결과: 기관 내강 및 상피 세포의 변화는 초냉동 보관의 시행 유무와는 차이가 없었으며, 면역억제제의 투여 유무에 따라 현저한 차이가 관찰되었다(p<0.01). 면역억제제를 투여하였던 III군과 VI군의 경우 기관 내강이 잘 유지되어 있었고 정상 상피 세포의 관찰이 가능하였으나, 나머지 군의 대부분의 기관절편에서 기관 내강이 섬유 조직의 증식에 의해 거의 폐쇄되어 있었고, 상피세포의 소실 및 상피하 조직의 관찰이 힘들었다. 이러한 기관 내강의 섬유 조직의 증식은 폐이식술과 관련된 폐색성 세지관지염의 병리 소견과 유사하였다. 결론: 쥐 기관의 초냉동 보관후의 이소 이식술시 적절한 면역억제제의 투여로 기관 내강 및 기관 상피세포가 잘 유지됨을 알 수 있어, 보다 장기간의 기관 보관이 가능할 것으로 생각된다. 그러나 초냉동 보관의 시행 여부와는 상관없이 면역억제제를 투여하지 않은 군에서 폐색성 모세기관지염과 비슷한 양상의 기관 내강의 섬유조직 과잉 증식 및 기관 상피세포의 소실 등이 관찰되었다. 쥐와 같은 소동물에서의 이러한 시도는 폐이식술과 관련된 어려운 문제중의 하나인 폐색성 모세기관지염의 병인, 예방 및 치료를 위한 연구에 있어 좋은 실험 모델이 될 수도 있을 것이다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권16호
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• pp.6981-6986
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• 2015

Background: Breast cancer is the most common cancer in women. One way to decrease the burden of this cancer is early detection through mammography. This study compared the effectiveness of two different educational methods for teachers' uptake of mammography based on the Health Belief Model. Materials and Methods: The current study was a randomised trial of 120 teachers over 40 years old in two groups receiving multimedia or group education, both based on the Health Belief Model. Participants completed questionnaires before, immediately and three months after educational intervention. Mammography was evaluated before and after educational intervention. Results: The participants in the two groups were demographically similar. Comparison showed no difference noted in the scores of knowledge, perceived barriers, susceptibility, and severity constructs between two groups (p > 0.05). Health motivation and benefit were perceived to be higher in the group education compared to the multimedia group. There was a significant difference in mammography between two groups after the intervention (p= 0.003). Conclusions: Planning and implementation of educational program based on the Health Belief Model can raise knowledge and increase participation in mammography especially with group education.

• Asian Pacific Journal of Cancer Prevention
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• 제14권6호
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• pp.3565-3568
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• 2013

Background: Cholangiocarcinoma is the most common cancer in males in Thailand. The outcome is poor although systemic chemotherapy has been used in attempts to improve disease control, quality of life and prolong survival in patient with unresectable and advanced disease. Materials and Methods: In this retrospective study the medical records of all patients diagnosed as having unresectable and metastatic cholangiocarcinoma and receiving systemic chemotherapy at Udonthani Cancer Hospital during January 2007 to December 2010 were reviewed. Results: Among the total of 105 patients, 21 received gemcitabine-based chemotherapy and 84 5FU-based chemotherapy. Most received platinum doublet regimens. 5FU-based regimens yielded an overall response rate (tumor control) of 23.8% and a median survival of 7.2 months while gemcitabine-based regimens yielded an overall response rate (tumor control) 19.1% and a median survival of 10.0 months. Conclusions: Tumor control and survival of patient with advanced cholangiocarcinoma treated with gemcitabine-based and 5FU-based chemotherapy do not markedly differ.

• Asian Pacific Journal of Cancer Prevention
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• 제14권6호
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• pp.3561-3564
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• 2013

Background: The negative effects of gynecologic cancer on women's health is multidimensional. Sexual problems arising after chemotherapy are decreased interest and vaginal lubrication, lack of orgasm and dyspareunia and sense of reduction in sexual attractiveness in general. The purpose of this study was to evaluate changes that patients who receive chemotherapy for a gynecologic oncology disorder experience in their sexual functions. Materials and Methods: A descriptive/cross-sectional and qualitative study was performed. The Female Sexual Function Index (FSFI) was used in order to collect data on sexual capacity. The quantitative data obtained were evaluated with frequency and percentage calculations while content analysis was performed for the qualitative data. Results: All of the information related to sexuality was provided by the physician. Chemotherapy treatment affected sexuality negatively in 55.9%. Since receiving the diagnosis, 52.9% of women had experienced no sexual intercourse at all. Those who had an FSFI score of 30 and below made up 75% of the women. After the content analysis of data obtained during in in-depth interviewing, we focused on three main themes: desire for sexual intercourse, problems experienced during sexual intercourse, and coping with problems. Conclusions: An integrated system where sexual problems can be handled professionally should be present during gynecological cancer treatment.

• Asian Pacific Journal of Cancer Prevention
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• 제16권5호
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• pp.2051-2054
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• 2015

Background: Radiation therapy is a key part of the combined modality treatment for Hodgkin's lymphoma (HL) and non-Hodgkin's lymphoma (NHL), which can achieve locoregional control of disease. The 3D-conformal radiation oncology can be extended-field (EFRT), involved-field (IFRT) and involved node (INRT). New techniques have resulted in a smaller radiation field and lower dose for critical organs such as lung heart and breast. Materials and Methods: In our research, we made a virtual simulation for one patient who was treated in four different radiotherapeutic techniques: mantle field (MFRT), EFRT, IFRT and INRT. After delineatiion we compared dose-volume histograms for each technique. The fusion of CT for planning radiotherapy with the initial PET/CT was made using Softver Xio 4.6 in the Focal program. The dose for all four techniques was 36Gy. Results: Our results support the use of PET/CT in radiation therapy planning. With IFRT and INRT, the burden on the organs at risk is less than with MFRT and EFRT. On the other hand, the dose distribution in the target volume is much better with the latter. Conclusions: The aim of modern radiotherapy of HL and NHL is to reduce the intensity of treatment and therefore PET/CT should be used to reduce and not increase the amount of tissue receiving radiation.

• 한국가시화정보학회지
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• 제5권1호
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• pp.30-36
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• 2007

The global environment is deteriorating at an alarming rate, despite of enhanced international environmental regulation. Many studies have been performed to reduce toxic pollutants. Recently, plant-based phytoremediation technology for moving toxic contaminants from soil and water has been receiving large attention. Arsenic-contaminated soil is one of the major pollutant sources for drinking water. Pteris erotica has been known as a hyper-accumulator of arsenic from soils. In this study, we investigated the effect of arsenic absorption on sap flow inside xylem vessels of Pteris. The synchrotron X-ray micro-imaging technique was employed to monitor the refilling process of water containing arsenic inside the xylem vessels of Pteris's leaves and stems non-invasively. The captured phase-contrast X-ray images show both anatomy of internal structure and transport of water inside Pteris. The exposure of Pteris to arsenic solution was found to increase largely the water raise speed in xylem vessels. The present results would provide important information needed for understanding the mechanisms of accumulation and transportation of toxic materials in plants.

• 한국전자통신학회논문지
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• 제8권6호
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• pp.815-822
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• 2013

본 논문에서는 물류 시스템에서 원료의 운송 작업에 필요한 컨베이어 고무벨트의 파손을 감지할 수 있는 시스템 개발에 대한 연구이다. 벨트의 내부에 전기 유도가 가능한 재료를 삽입하여 벨트의 파손이 발생했을 경우 전자 시스템에 의한 벨트의 파손을 감지할 수 있는 시스템을 개발하여 벨트의 파손을 최소화하도록 하였다. 따라서 벨트의 수리비용이나 운송 중인 물류의 재정리 단계의 시간을 줄일 수 있다. 벨트의 파손을 감지하기 위한 방법으로 송신 신호를 벨트 내에 삽입된 코일에 유도하고, 수신 측에서 코일에서 유도되는 전기 현상을 감지하여 벨트의 파손을 감지하도록 하였다.