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캐패시터 배터리 기반의 도어록 장치 및 관제 시스템 설계
한대철(Dae-Cheol Han),정준화(Jun-hwa Jeong),문학룡(Hak-Ryong Moon),고자경(JaKyung-Ko) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.11
호텔, 리조트 등의 대형 숙박시설의 도어록 장치는 배터리 방식의 전자식 방식을 채용하고 있다. 기존의 도어록 장치는 배터리 상태를 고려한 교체 어려움과 더불이 원격에서 상태 감시를 통한 유지관의 어려움으로 인하여 비용 및 업무 효율의 저하 등의 문제가 발생되고 있다. 본 연구에서는 도어록 배터리의 수명 연장, 원격 상태감시가 가능한 시스템을 설계하고 기초 실험을 하였다. 특히 배터리수명연장을 위해서는 커패시터-일차전지 콤비네이션 배터리 시스템 연구를 통해 배터리 교체시기를 최대한 연장하고, Wi-Fi 기술을 접목하여 배터리 상태를 원격에서 감시 할 수 있는 시스템을 설계하였다. 그 효과를 입증하기 위하여 본 연구에서는 기초 실험을 하였다. 이를 통하여 도어록 배터리 교체 시스템의 기술적 기반을 마련하고 실시간 원격 감시를 통해 유지관리 측면에서 배터리 교체 시점의 적정성 확보를 통해 비용 절감의 업무의 효율성을 높이는데 기여할 수 있다고 판단된다.
유방암 환자의 수술 전 액와림프절 전이 여부 평가를 위한 영상의학적 검사의 효용성
김경덕(Kyeong Deok Kim),인정진(Jeong Jin In),장윤희(Yun Hee Jang),김지선(Zisun Kim),국중철(Jung Cheol Kuk),최규성(Kyu Sung Choi),정재홍(Jaehong Jeong),허성모(Sung Mo Hur),정귀애(Gui Ae Jeong),정준철(Jun Chul Chung),조규석(Gyu Seok Ch 대한종양외과학회 2015 Korean Journal of Clinical Oncology Vol.11 No.2
Purpose: The purpose of this retrospective study was to identify the diagnostic performance of positron emission tomography/computed tomography (PET/CT) compared to conventional modalities, such as ultrasonography (US) and contrast-enhanced computed tomography (CT) in detecting axillary lymph node metastasis (ALNM) in patients with breast cancer. Methods: Two hundred thirty-three consecutive patients diagnosed with primary breast cancer who had not been treated with neoadjuvant chemotherapy and had been examined by US, CT, and PET/CT before surgery were included. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of each imaging modality and combinations of modality according to tumor size were obtained, and were compared with the histopathological results of sentinel lymph node biopsy or axillary lymph node dissection. Results: ALNM was confirmed in 32.6% (76/233) of patients. The sensitivity, specificity, PPV, NPV, and accuracy of US for detecting ALNM were 65.8%, 86.6%, 70.4%, 84.0%, and 79.8%, respectively. The sensitivity, specificity, PPV, NPV, and accuracy of CT were 72.4%, 72.6%, 56.1%, 84.4%, and 72.5%, respectively. The sensitivity, specificity, PPV, NPV, and accuracy of PET/CT were 69.7%, 86.0%, 70.7%, 85.4%, and 80.7%, respectively. The combination of US and PET/CT showed the most accurate results with specificity, PPV and accuracy values of 93.6%, 81.5%, and 82.0%, respectively. Conclusion: The diagnostic performance of PET/CT was comparable to that of US and CT. Combination of US and PET/CT could be a reliable strategy for determining preoperative ALNM in patients with operable breast cancer.
갑상선유두암에서 갑상선전절제술과 중심경부림프절절제술 후 발생하는 저칼슘혈증 예측 인자 연구
이옥주(Ok Joo Lee),김형철(Hyung Chul Kim),임철완(Cheol Wan Lim),신응진(Eung Jin Shin),조규석(Gyou Suk Cho),정준철(Jun Chul Jung),정귀애(Gui Ae Jung),김지선(Zisun Kim),정재홍(Jae Hong Jeong),최규성(Kyusung Choi),한선욱(Sun Wook Han),허 대한갑상선-내분비외과학회 2015 The Koreran journal of Endocrine Surgery Vol.15 No.3
Purpose: Total thyroidectomy with central lymph node dissection (CLND) is a treatment modality of choice for thyroid cancer. Hypocalcemia is the most common complication after total thyroidectomy. The aim of the current study was to determine the association between surgery-related clinical factors and postoperative hypocalcemia. Methods: A prospective analysis was performed for 101 patients who underwent total thyroidectomy with CLND for papillary cancer from June 2013 to June 2014. Correlation between clinicopathologic factors and postoperative hypocalcemia was analyzed. Results: Based on the postoperative day-2 calcium, 56 patients (55%) developed hypo-calcemia and 45 patients (45%) were normal. No significant differences in histopathologic (tumor size, tumor focality, histologic type, number of retrieved lymph nodes, metastatic lymph node, thyroiditis, retrieved parathyroid gland) findings were observed between the hypocalcemia group and normal calcium group. Mean value of the postoperative day-0 parathyroid hormone (PTH) was significantly lower in the hypocalcemia group (hypoca1cemia group: 14.3±9.4 pg/mL; normal group: 25.0±16.4 pg/mL; P<0.001). In logistic regression analysis, postoperative PTH was a factor significantly affecting postoperative hypocalcemia (OR 0.93; CI: 0.90-0.97; P<0.001). In ROC analysis, the cut-off value of PTH was 19.965 (sensitivity 79%, specificity 58%), and area under the curve (AUC) was 0.709 (95% CI: 0.607-0.811). Conclusion: Postoperative PTH was a factor predicting hypocalcemia after total thyroidectomy with CLND. Use of postoperative PTH as a screening tool for prediction of postoperative hypocalcemia would be useful in management of patients with hypocal-cemia.
재발성 직장암의 간전이 환자에서 시행된 전간 혈류 차단과 정맥 혈류 우회술 그리고 장기 보존액 주입 하의 ante situm 간절제술
주종우(Chong Woo Chu),김형철(Hyung Chul Kim),신응진(Eung Jin Shin),임철환(Cheol Wan Lim),조규석(Gyu Seok Cho),정준철(Jun Cheol Chung),정귀애(Gui Ae Jeong),송옥평(Ok Pyung Song),진수지(Soo Ji Jin),김희경(Hee Kyung Kim),박성진(Seong Ji 한국간담췌외과학회 2008 한국간담췌외과학회지 Vol.12 No.2
We present here a case of recurrent rectal cancer liver metastasis that was managed with ante situm liver resection under total vascular exclusion (TVE) and venovenous bypass with hypothermic perfusion. A 58-year-old man who suffered with rectal cancer liver metastasis was transferred to our hospital in January 2006. A left lateral sectionectomy had been previously performed. Recurrent lesion developed in segments I, IV and VIII one year after the first hepatectomy. The tumor was 5 cm in diameter and it involved the confluence of the hepatic veins and the retrohepatic vena cava. An incomplete tumor-free margin and massive bleeding were expected with performing a conventional liver resection, together with vena cava reconstruction. Therefore, we planned an ante situm liver resection under TVE and venovenous bypass with hypothermic perfusion. After adhesiolysis, hilar dissection was carried out. The inflow to the medial segment was interrupted, and then the liver and inferior vena cava (IVC) were mobilized fully. During controlling the bleeding of a short hepatic vein, we found adhesion of the hepatocaval portion. Therefore, TVE and venovenous bypass were performed along with suprahepatic IVC transection. The long conduit of V5 was preserved during hepatic parenchymal dissection, and the paracaval portion of the caudate lobe was readily detached from the IVC. The suprahepatic IVC was reconstructed after V5 reconstruction with using the saphenous vein. Portal vein anastomosis was then conducted. After reperfusion, an end-to-side anastomosis was performed between the saphenous vein graft and the IVC. Finally, a Roux-en- Y hepaticojejunostomy was carried out. The patient remains well without recurrence 12 months after the last operation.
박경우 ( Kyung Woo Park ),김영석 ( Young Seok Kim ),김상균 ( Sang Gyune Kim ),정승원 ( Soung Won Jeong ),장재영 ( Jae Young Jang ),김흥수 ( Hong Soo Kim ),이세환 ( Sae Hwan Lee ),김부성 ( Boo Sung Kim ),정준철 ( Jun Cheol Jeong 대한간암학회 2015 대한간암학회지 Vol.15 No.2
For a small hepatocellular carcinoma (HCC), liver resection shows most favorable outcome in case which liver transplantation is not available, although it has also substantial recurrence rate. Here, we report a case of recurred HCC with multiple intrahepatic metastasis at 5 months after surgical resection for small HCC was done. A 55-year-old man with chronic HBV infection received subsegmentectomy for HCC less than 2 cm. A follow-up computed tomography (CT) at 5 months from operation revealed that there were multiple enhancing nodules in entire remnant liver. Intra-arterial injections of adriamycin mixed lipiodol and gelfoam particles were instituted through hepatic artery. We assume that poorly differentiated cellular feature would be attributable to this kind of very early and aggressive recurrence of HCC. (J Liver Cancer 2015;15:122-125)