• 한국기계가공학회지
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• 제18권12호
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• pp.45-51
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• 2019

As the separator becomes thinner, the role of thermal stability becomes more important in ensuring the high capacity of medium- and large-sized lithium-ion secondary batteries. In this study, we researched coating technology to improve the separator's thermal stability. We minimized the coating time by optimizing the design of a vertical two-stage coater that was thin, uniform, and capable of coating on both sides at the same time with a maximum 2㎛ thickness coating layer of fluorinated polymer (PVdF-HFP) on the bare polyethylene (PE) separator, which increased the thermal stability. In addition, during the coating process, a dual-jacket-roll method of drying was developed that increased the drying effectiveness without thermal damage to the separator. We also investigated the thermal stability of the separator manufactured from a coating machine, and studied the battery-applied performance by making a lithium-ion pouch battery.

• 한국분무공학회지
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• 제21권1호
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• pp.20-28
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• 2016

This paper presents an experimental study on the GDI injector with Bosch method. The injection characteristics, such as the injection quantity, the injection rate, the maximum velocity of the nozzle exit and the injection delay were studied through the change of the injection pressure, the tube pressure and energizing duration in injection rate measurement device using nheptane. The injection quantity is increased by increasing injection pressure, decreasing tube pressure or increasing energizing duration. As the difference of the injection quantity changed, the shape of injection rate was moved with a constant form. The maximum velocity of the nozzle exit showed a tendency to increase as the injection pressure is increased. However, tube pressure did not affect. Overall, it was confirmed that the closing delay is longer than the opening delay in all conditions. As the injection pressure increased, the result has a tendency to decrease the closing delay, it did not affect the opening delay. Reduction of the closing delay showed the reduction of the injection duration. the tube pressure and energizing duration did not affect the injection delay (opening delay, closing delay).

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제9권5호
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• pp.567-577
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• 2003

GPRS 망으로 이동한 이동 ISP 가입자는 자신의 홈 ISP 망을 접속하여 무선 인터넷 서비스를 받기 위해 홈 ISP 망으로부터 인증을 받고 IP를 할당받아야 한다. 이에 본 논문에서는 GPRS 망으로 이동한 이동 ISP 가입자의 인증 처리를 위해 PPP CHAP과 RADIUS 인증 서버의 연계 방안을 제시한다. 이를 위해 우선 이동 ISP 망 가입자의 단말에서 정의되어야 할 인증 메시지 구조와 GPRS 망 게이트웨이에서 구현될 메시지 구조를 제시한다. 아울러 GGSN과 ISP 망간의 인증 메시지 구조 정의를 기반으로 제안된 내용에 대해 시험 환경 구축을 통해 실제 시뮬레이션 결과를 보였다.

• 한국산학기술학회논문지
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• 제8권3호
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• pp.496-501
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• 2007

본 논문에서는 우편 물류 환경에서 실시간 소포 처리 및 파렛 관리를 위한 RFID 적용 모델과 시스템 구조를 제시하였다. 또한 제시한 RFID 응용 모델과 시스템 구조에 기반하여 RFID 기술을 우정 물류 현장 도입에 앞서 사전에 문제점을 파악하여 그 해결 방안을 모색하고 시행착오를 줄이기 위해 우편 물류용 RFID 응용 시스템 Testbed를 구축했고, 구축한 우편용 RFID 응용 시스템을 이용해 매체별 RFID 태그 인식 성능에 대한 시험 결과를 보였다. 실험에서 종이와 알미늄호일에 대한 인식성능이 물과 캔에대한 인식성능보다 높음을 알 수 있었다.

• 한국염색가공학회지
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• 제30권1호
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• pp.38-50
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• 2018

This investigation reported the recent development of 3 dimensional fabrics such as spacer fabric, 3 dimensional multi-layered fabric and 3 dimensional braided fabric. First, we categorized 3 dimensional fabrics into 3 main products; 3 dimensional woven fabrics, 3 dimensional knitted fabrics and 3 dimensional braided fabrics with reviewing the possible main applications. We also reported the research and development trends of 3 dimensional fabrics by analyzing technical trends in industry and research institutes at domestic and overseas. United State, Germany and Japan lead the manufacturing technology for the mainly preform related products to apply in aerospace, automotive, protections, architecture and clothing applications. Lastly, we reviewed the main products of the leading company which manufactured using the 3 dimensional fabrics.

• 한국자동차공학회논문집
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• 제22권3호
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• pp.220-227
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• 2014

This paper presents about multi-rate sensors' synchronization and filter fusion via a sigmoid function of the Kalman filter. To synchronize multi-rate sensors, the estimation states of the Kalman filter is modified. A specific matrix that makes the filter choose sensor values only updated is multiplied to measurement matrix. For the filter that has weak points on some criteria, filter fusion is suggested by using sigmoid function. Modified kalman filter is tested with practical case. A sigmoid function was designed for the test and the performance of the modified function is estimated with respect to conventional Kalman filter. Unscented Kalman filter is used to the base filter of the suggested filter because of its stability.

• 한국축산시설환경학회지
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• 제1권1호
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• pp.47-53
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• 1995

An efficient Treatment of animal wastewater is one of the hot issues for preventing the environmental pollution. It should be established the design parameter in order to purify the animal wastewater. A test is carried on in the pilot plant as a simplified activated sludge process. A vibration sieve separator is deviced to keep the pollution load constant by means of separation of solid matter. The BOD removal efficiency of the vibration sieve showed over 50%. As the test results, the BOD contents of the influent was in average of 3,000 mg/I and that of the effluent 85 mg/I. So, the BOD removal rate showed 97% in average. The SS-contents in the primary chamber was about 3,300 mg/I and that of effluent 92 mg/I. The SS removal efficiency showed 97%. The removal rate of total nitrogen and phosphore were in average of 82% respectively. Carrying out in winter season, it showed relatively good results; The design parameter approved in this test can be applied to the full-time farmers.

• 한국식품위생안전성학회지
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• 제14권1호
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• pp.60-66
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• 1999

Diethylnitrosamine (DEN) is known as a potential hepatic carcinogen by single administration. This study was designed to measure the effects of DEN-induced cell damage on the triglyceride and cholesterol concentration in the liver, excluding dietary effects. Fertilized chicken eggs, 10 days before hatching, were randomly divided into three groups (n=20) and each egg was injected 10 ${mu}ell$ of corn oil (vehicle control), 5 $\mu\textrm{g}$ of DEN/10 ${mu}ell$ of DEN/10 ${mu}ell$ into yolk via air sac. After 48 hr and 96 hr incubation, the damage of the chick-embryo liver cell was investigated by electron microscopy and by measuring the concentration of lipid components (total cholesterol, free cholesterol, phospholipid and triglyceride). For eggs administered 10 $\mu\textrm{g}$ of DEN and incuvated 96 hr, in hepatocyte, the nucleus membrane was roughed, the size of nucleolus was apparently increased and euchromatin was accumulated. Mitochondria were condensed and cristae, located mitochondiral inner membrane, were obscured. Additionally, the leaves of triglyceride and cholesterol classes were significantly increased depend on the amount treated with 10 $\mu\textrm{g}$ DEN at 96 hr, but phospholipids component of cell membrane, were decreased with significance. As a conclusion, carcinogen induced hepatic lesion was correlated with the changes in lipid component of liver.

• Journal of Chest Surgery
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• 제30권11호
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• pp.1125-1127
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• 1997

본 8kg, 18개월 환아는 다른 병원에서 심실 중격 결손증 수술을 받았으며 수술후 합병증으로 약물치료를 받아 왔으나 심실 비대와 심부전증이 악화되었으며 본원에서 시행한 심도자 결과 좌심실과 대동맥간 혈압 차이는 55mmHg를 보였다. 본원에서는 이와 같은 소아에서의 심실 중격 결손증 수술후 발생한 대동맥 판막하 협착증의 성공적 수술 증례를 보고하는 바이다.

• The Korean Journal of Pain
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• 제10권2호
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• pp.208-213
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• 1997

Background: Pruritus is the most frequent undesirable symptom associated with epidural morphine. It is unpleasant and often difficult to treat. Naloxone is presently the drug of first choice for treating this symptom. Naloxone however decrease the pain threshold in some cases. Recently it was reported subhypnotic doses of propofol were efficient in relieving epidural-morphine-induced pruritus(EMIP). In a prospective. randomized, double-blinded clinical trial, we compared the efficacy of propofol and naloxone for treatment of EMIP. Methods: Forty patients with EMIP were allocated to receive either 20 mg propofol, or 1.5 ${\mu}g/kg$ naloxone intravenously. Pruritus and level of postoperative pain were assessed after 5 min, using pruritus rating scale and visual analogue scale. Results: The overall success rate in treating pruritus was similar in both groups (propofol 70% vs naloxone 65%). Twenty-five percent of the patients in the naloxone group had an increase in the level of postoperative pain versus none in the propofol group(P=0.018). Conclusions: These results suggest propofol and naloxone are equally effective in treating EMIP. However, the level of postoperative pain is significantly reduced when treated with propofol.