Chebyshev 함수에 의한 테이퍼형 선로의 설계에서 임피던스 불연속 제거에 관한 연구

이종빈,이상호,김상태,신철재 한국전자파학회 1997 한국전자파학회논문지 Vol.8 No.6

Chebyshev 함수에 의하여 테이퍼형 선로를 설계할 때 Chebyshev 함수는 테이퍼 길이가 한 파장근처에서 임 피던스 불연속을 발생시켜 실제 제작된 선로는 그 특성이 나빠진다. 이를 보완하기 위하여 이 함수들을 중첩시켜 불연속이 제거된 새로운 함수를 이 논문에서 제안하였다. 이 개선된 함수를 이용하여 구형과 원형 도파관과의 트랜지션을 설계하였으며 기존 방법으로 설계하였을 때보 다 반사손실이 5dB 이상 개선되었음을 보여주었다. When the Chebyshev function is applied to design the waveguide transition, it exhibits poor impedance matching characteristics due to impedance discontinuities at the ends of tapered line. In this paper, an improved Chebyshev function, which is obtained by using the convolution property, is proposed to make improvements on the impedance matching characteristics of the waveguide transition. When rectangular to circular waveguide transition is designed by improved function, then the computed return loss is approximately 5 dB better than the conventional Chebyshev function.

면역결핍누드쥐에 이식된 neuroblastoma에서의 물질전달에 미치는 인자의 특성

이종빈,G.R 대한의용생체공학회 1994 의공학회지 Vol.15 No.1

단세포군항체(monoclonal antibody)를 이용한 항암제치료법이 다각적인 방면으로 실험되고 있으나, 환자에 주입된 단세포군항체중에서 실제의 암전달량은 언제나 기대치에 미치지 못하고 있다. 그러므로, 효과적인 항암제치료와 조기암진단을 위하여 암내부에서의 물질전달에 미치는 인자들의 포괄적인 측정이 필요하였다. 본 실험에서는 면역결핍누드쥐에 이식된 neurobastoma의 물질전달환경을 이해하기 위하여 성장특성과 포도당대사속도(GMR)를 측정하였으며, 세포간체액압력(IFP), 국부혈액속도(BPR)와 pH를 높이 2cm의 암에서 반경방향으로 측정하였다. 성장특성으로써 체적배가시간을, 세포활동성으로써 GMR를 측정하였더니, 각각 8.1일 (SD 0.44일), 23.53 mg/min/100g(SD 3.54 mg/min/100 g)이었다. 암중심 IFP는 암부피가 커짐에 따라 증가하여 높이 3cm의 암에서는 12.3mmHg(SD 2.6mmHg)이 되었다. 반경방향에 따른 IFP, BPR, pH를 특정한 결과, 암중심에 접근할수록 IFP는 증가되었고, 반면에 BPR과 pH는 감소되었다. 이로써 암내부에서의 증가된 IFP, 감소된 BPR과 pH가 단세포군항체와 그 공합체의 내부전달을 저해하는 원인으로 작용할 수 있다는 사실이 제시되었으며, 이들 인자들을 적당한 기술로 조절하여 더 많은 단세포군항체를 암내부로 전달시킬 수 있을 것으로 판단된다. The chemotherapy using macromolecules, i.e., monoclonal antibodies loaded with anticancer agents hasn't been successful in delivering therapeutic amount of the conjugates. The comprehensive evaluation of mass transfer factors in tumor is prerequisite for the development of the effective chemotherapy. Characterization of neuroblastoma implanted in immunosuppressed athymic nude rats was performed. Its growth kinetics, glucose metabolic rate (GMR) were measured along with the interstitial fluid pressure (IFP), blood perfusion rate (BPR) and pH distribution throughtout the tumor radius. Volume doubling time and GMR were 8.1 days(SD 0.44 day), 23.53 mg/min/100 g(SD 3.54 mg/min/100 g), respectively. The IFP in tumor center was increased with tumor volume, and approached to 3 mmHg (SD 2.6 mmHg) when the tumor was 3 cm high. The radial distribution of IFP, BPR and pH in 2 cm high tumors showed that BPR and pH were decreased, while IFP was increased as the ~ensors moved toward the tumor center. The elevated IFP, decreased BPR and pH in tumor center suggested that the delivery of conjugates might be increased by properly manipulating mass transfer factors.

생쥐 배양섬유 모세포주 L929에 미치는 중금속(Cd, Ni, Zn)류의 세포독성에 관한 연구

이종빈,나명석,황영진,위성욱,최진희,김선희,유춘만,김재민 한국환경보건학회 1997 한국환경보건학회지 Vol.23 No.2

The study on the cytotoxicity of heavy metals was carried out to evaluate the cytotoxic effect of those on mouse L929 fibroblast cell in 96-well microtiter plates. The cytotoxicity was assayed by the neutral red, tetrazolium MTT, total protein, micronuclei test. The cytotoxicity of the heavy metals by neutral red and tetrazolium MTT was showed in order, cadmium > zinc > nickel for the cationic metals tested. The effect of metal-metal interaction on the cytotoxicity showed a marked reduction of cadmium toxicity by zinc, to a lesser degree, by nickel. The amount of total protein in treated group added heavy metals was less than that of the control and treated cadmium alone was less than those of combination with nickel or zinc. At midpoint cytotoxicity values of heavy metals, the frequency of micronuclei on the cell treated heavy metals was more than that of control and treated cadmium alone was more than those of combination with nickel or zinc. From those results, it could be suggested that the heavy metals decreased the viability of mouse fibroblast L929 cells in a concentration-dependent manner and have cytogenic toxic effects, but mixed group decreased the cytotoxic and cytogenic toxicity on L929 cells.

Transportation Automation System Design for Visually and Hearing Impaired Users in the Digital Environment

이종빈,김성기 사단법인 미래융합기술연구학회 2021 아시아태평양융합연구교류논문지 Vol.7 No.7

The transportation card ticket vending machine, a kiosk system first introduced in Korea in 1997, became a world-top-tier technological innovation and was gradually implemented in many other countries. Today, it is practically everywhere and expanded to other variable industry such as restaurant, concert hall and movie theater, and so on, because of cheaper of labor costs and convenience. It has recently achieved more than 95% installed vendinFg machine in most of service markets, stores, even local supermarkets. However, this being part of the digital age, causes a digital discrimination especially on the persons with visual or hearing impairment, which makes performing everyday activities difficult if not properly addressed. Thus, the study proposed an improved transportation card vending machine system, with design and operational flow that will serve these persons with disabilities. It has a simplified menu display with voice recognition and body language service, and a service mode setting automatically detecting the disability level of the user. To increase the success rate among kiosk users, the system recommends destinations through voice or text interface to lead the users to choose only one digit number representing their exact destination. It is intended to reduce the fail attempt during user interaction and to provide an improved transportation card vending machine system with design and operation flow that will serve these persons with disabilities.

Correlation analysis of gingival recession after orthodontic treatment in the anterior region: an evaluation of soft and hard tissues

이종빈,백수진,김민지,방은경 대한치주과학회 2020 Journal of Periodontal & Implant Science Vol.50 No.3

Purpose: The aim of this study was to investigate and identify the main causes of periodontal tissue change associated with labial gingival recession by examining the anterior region of patients who underwent orthodontic treatment. Methods: In total, 45 patients who had undergone orthodontic treatment from January 2010 to December 2015 were included. Before and after the orthodontic treatment, sectioned images from 3-dimensional digital model scanning and cone-beam computed tomography images in the same region were superimposed to measure periodontal parameters. The initial labial gingival thickness (IGT) and the initial labial alveolar bone thickness (IBT) were measured at 4 mm below the cementoenamel junction (CEJ), and the change of the labial gingival margin was defined as the change of the distance from the CEJ to the gingival margin. Additionally, the jaw, tooth position, tooth inclination, tooth rotation, and history of orthognathic surgery were investigated to determine the various factors that could have affected anterior periodontal tissue changes. Results: The mean IGT and IBT were 0.77±0.29 mm and 0.77±0.32 mm, respectively. The mean gingival recession was 0.14±0.57 mm. Tooth inclination had a significant association with gingival recession, and as tooth inclination increased labially, gingival recession increased by approximately 0.2 mm per 1°. Conclusions: In conclusion, the IGT, IBT, tooth position, tooth rotation, and history of orthognathic surgery did not affect labial gingival recession. However, tooth inclination showed a significant association with labial gingival recession of the anterior teeth after orthodontic treatment.

Evaluation of prognosis related to compliance with supportive periodontal treatment in patients with chronic periodontitis: a clinical retrospective study

이종빈,신혜정,김대엽,방은경 대한치주과학회 2019 Journal of Periodontal & Implant Science Vol.49 No.2

Purpose: The purpose of this study was to evaluate the prognostic effect of patient compliance with supportive periodontal treatment (PC-SPT). Chronic periodontitis patients were classified based on their compliance level, and factors affecting PC-SPT and the prognosis of PC-SPT were investigated. Methods: This study selected 206 patients who started SPT after receiving periodontal treatment between 2010 and 2012. Patients who continued SPT through February 2016 were included. The patients were classified according to whether they exhibited complete compliance (100% of visits), excellent compliance (≥70% of visits), incomplete compliance (<70% of visits), or non-compliance (only 2 visits). Patient characteristics that could affect PC-SPT, such as age, sex, distance of the clinic from their residence, implantation, and periodontal treatment, were investigated. The number of newly decayed and extracted teeth, alveolar bone level changes around the teeth and implants, and implant removal were examined to evaluate the prognosis of PC-SPT. Results: Sex and the presence of an implant significantly affected PC-SPT. Additionally, the number of newly decayed and extracted teeth and changes in alveolar bone levels around the teeth and implants were significant prognostic factors related to PC-SPT. Conclusions: PC-SPT in chronic periodontitis patients will help maintain periodontal health and prevent further periodontal disease.

철근콘크리트조 건축공사의 공종별 위험성 평가

이종빈,고성석,장성록 한국안전학회 2005 한국안전학회지 Vol.20 No.1

개선된 Chebyshev 함수를 이용한 트랜시션 설계에 관한 연구 ( The Design of Transition with Approved Chebyshev Function )

이종빈,양기덕,김상태,신철재 한국통신학회 1996 한국통신학회 학술대회논문집 Vol.15 No.3

위험성향을 고려한 자산매각문제 유형별 의사결정 패턴의 비교 분석에 관한 실증 연구

이종빈,손재동 한국경영공학회 2015 한국경영공학회지 Vol.20 No.4

Suppose that someone needs to sell a building by a certain date in the future because of the emigration or studying abroad, etc. Then he/she are faced with a decision problem of when and how to accept the price offered by a potential buyer. This kind of problem is referred to as assets selling problem(ASP). This paper deals with the following three types of ASP model; 1) with only discount factor, 2) with discount factor and search cost, and 3) with discount factor, search cost, and recall with reservation cost. With respect to these three types of ASP, the experimental games are developed by Java. By use of the game, the various decision patterns in ASP are analyzed. In addition, the influence of decision maker’s risk attitude on the decision making in ASP is investigated as well.

기도를 압박하여 호흡곤란을 유발한 식도이물 1례

이종빈,김호중,조영순,이명갑,유병대,전덕호 대한응급의학회 2011 大韓應急醫學會誌 Vol.22 No.2

Foreign bodies that migrate outside the esophagus into the mediastinum or soft tissues usually cause respiratory symptoms. Also, esophageal foreign body granulomas that cause tracheal stenosis, lobar atelectasis, and bronchoesophageal fistulas are reported as complications. Foreign bodies can become lodged above esophageal strictures, and chronically-embedded esophageal foreign bodies can induce stricture formation, although these are less common. This is rare case report that the trachea was directly compressed due to impacted esophagus by foreign body.