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배진아 ( Jina A Bae ),차봉환 ( Bong Hwan Cha ),김기영 ( Ki Young Kim ),장중순 ( Joong Soon Jang ) 대한설비관리학회 2013 대한설비관리학회지 Vol.18 No.3
Solders are vitally used in SMT (surface mounting technology) processes of electronics manufacturing. Because of environmental issues, however, regulation like RoHS has been imposed on solders. This paper is to perform environmental effect assessment for the solder using E-FMEA (environmental- failure mode and effect analysis). To this end, solders and processes using them are identified and classified into activities, and then their potential environmental effect modes, causes/mechanisms, and environmental effects are estimated. Those derived modes and effects are assessed based on controlling documents (S), public image (I), environmental consequences (O) and improvement possibility. Improvement action plans are established for those 4 critical items that may affect environment seriously.
유료화에 따른 웹사이트 상표전환여부의 결정요인에 관한 연구
배진아(Jina-Na Bae),조연하(Youn-Ha Cho),이영주(Young-Joo Lee) 한국언론학회 2003 한국언론학보 Vol.47 No.4
The purpose of this study is to identify important factors affecting a community operator's decision upon brand switching (or brand non-switching) when the community service starts to be charged for. For this purpose, this study suggests a hypothetical model for website brand switching and tries to provide empirical evidence for it. The result turns out that the determinants of brand switching are users' trust in the website and the switching cost for community members perceived by community operator. The switching cost for community operator, which the theoretical model has suggested to be an important factor, is proved to be insignificant. The users' trust in the website turns out to increase along with the better evaluation of the provided service. In addition, it shows that the cost perceived by community operator tends to get higher when he/ she considers the community assets high and when he/ she is not good at using internet. This study is significant in that it attempts to identify the determinant factors in brand switching decision by the website users and provides a theoretical base for the effective strategy by which a website can successfully retain customers.
Feasibility and response of helical tomotherapy in patients with metastatic colorectal cancer
Bae, Sun Hyun,Moon, Seong Kwon,Kim, Yong Ho,Cho, Kwang Hwan,Shin, Eung Jin,Lee, Moon Sung,Ryu, Chang Beom,Ko, Bong Min,Yun, Jina The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.4
Purpose: To investigate the treatment outcome and the toxicity of helical tomotherapy (HT) in patients with metastatic colorectal cancer (mCRC). Materials and Methods: We retrospectively reviewed 18 patients with 31 lesions from mCRC treated with HT between 2009 and 2013. The liver (9 lesions) and lymph nodes (9 lesions) were the most frequent sites. The planning target volume (PTV) ranged from 12 to 1,110 mL (median, 114 mL). The total doses ranged from 30 to 70 Gy in 10-30 fractions. When the ${\alpha}/{\beta}$ value for the tumor was assumed to be 10 Gy for the biologically equivalent dose (BED), the total doses ranged from 39 to $119Gy_{10}$ (median, $55Gy_{10}$). Nineteen lesions were treated with concurrent chemotherapy (CCRT). Results: With a median follow-up time of 16 months, the median overall survival for 18 patients was 33 months. Eight lesions (26%) achieved complete response. The 1- and 3-year local progression free survival (LPFS) rates for 31 lesions were 45% and 34%, respectively. On univariate analysis, significant parameters influencing LPFS rates were chemotherapy response before HT, aim of HT, CCRT, PTV, BED, and adjuvant chemotherapy. On multivariate analysis, $PTV{\leq}113mL$ and $BED>48Gy_{10}$ were associated with a statistically significant improvement in LFPS. During HT, four patients experienced grade 3 hematologic toxicities, each of whom had also received CCRT. Conclusion: The current study demonstrates the efficacy and tolerability of HT for mCRC. To define optimal RT dose according to tumor size of mCRC, further study should be needed.
Infections in Lung Transplant Recipients during and after Prophylaxis
Bae Moonsuk,이상오,조경욱,최세훈,Lee Jina,채은진,도경현,Choi Dae-Kee,최인철,홍상범,심태선,김형렬,김동관,박승일 대한감염학회 2020 Infection and Chemotherapy Vol.52 No.4
Background: The timeline of infections after lung transplantation has been changed with the introduction of new immunosuppressants and prophylaxis strategies. The study aimed to investigate the epidemiological characteristics of infectious diseases after lung transplantation in the current era. Materials and Methods: All patients who underwent lung or heart–lung transplantation at our institution between October 29, 2008 and April 3, 2019 were enrolled. We retrospectively reviewed the patients' medical records till April 2, 2020. Results: In total, 100 consecutive lung transplant recipients were enrolled. The median follow-up period was 28 months after lung transplantation. A total of 127 post–lung transplantation bacterial infections occurred. Catheter-related bloodstream infection (25/84, 29.8%) was the most common within 6 months and pneumonia (23/43, 53.5%) was the most common after 6 months. Most episodes (35/40, 87.5%) of respiratory viral infections occurred after 6 months, mainly as upper respiratory infections. The remaining episodes (5/40, 12.5%) mostly manifested as lower respiratory tract infections. Seventy cytomegalovirus infections observed in 43 patients were divided into 23 episodes occurring before and 47 episodes occurring after discontinuing prophylaxis. Of 10 episodes of cytomegalovirus disease, four occurred during prophylaxis and six occurred after prophylaxis. Of 23 episodes of post–lung transplantation fungal infection, 7 were aspergillosis and all occurred after the discontinuation of prophylaxis. Conclusion: Lung transplant recipients experienced a high burden of infection even after 6 months, especially after the end of the prophylaxis period. Therefore, these patients should be continued to be monitored long-term for infectious disease.
Radiotherapy for initial clinically positive internal mammary nodes in breast cancer
Jina Kim,Jee Suk Chang,Seo Hee Choi,Yong Bae Kim,Ki Chang Keum,Chang-Ok Suh,Gowoon Yang,Yeona Cho,Jun Won Kim,Ik Jae Lee 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.2
Purpose: Internal mammary lymph node (IMN) involvement is associated with poor prognosis in breast cancer. This study investigated the treatment outcomes of initial clinically IMN-positive breast cancer patients who received adjuvant radiotherapy (RT), including IMN irradiation, following primary breast surgery. Materials and Methods: We retrospectively reviewed data of 95 breast cancer patients with clinically detected IMNs at diagnosis treated with surgery and RT between June 2009 and December 2015. Patients received adjuvant RT to the whole breast/ chest wall and regional lymph node (axillary, internal mammary, and supraclavicular) areas. Twelve patients received an additional boost to the IMN area. Results: The median follow-up was 43.2 months (range, 4.5 to 100.5 months). Among 77 patients who received neoadjuvant chemotherapy, 52 (67.5%) showed IMN normalization and 19 (24.6%) showed a partial response to IMN. There were 3 and 24 cases of IMN failure and any recurrence, respectively. The 5-year IMN failure-free survival, disease-free survival (DFS), and overall survival (OS) were 96%, 70%, and 84%, respectively. IMN failure-free survival was significantly affected by resection margin status (97.7% if negative, 87.5% for close or positive margins; p = 0.009). All three patients with IMN failure had initial IMN size ≥1 cm and did not receive IMN boost irradiation. The median age of the three patients was 31 years, and all had hormone receptor-negative tumors. Conclusion: RT provides excellent IMN control without the support of IMN surgery. Intensity-modulated radiotherapy, including IMN boost for breast cancer patients, is a safe and effective technique for regional lymph node irradiation.