• 전기학회논문지
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• 제62권10호
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• pp.1403-1407
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• 2013

This paper presents the method to calculate the motor parameters considering skew in EPS Interior Permanent Magnet Synchronous Motor (IPMSM). The skew is applied to stator or rotor by general technology used for design of reducing noise and vibration in motor. The characteristics analysis of motor including the skew is mostly used by 3D Finite Element Analysis (FEA), though, this analysis is a very time-consuming to perform. Besides, The reliability lacks due to the considerable change of motor characteristics according to the number of elements in 3D FEA. However, analysis time and effort can be saved by characteristic analysis considering skew using 2D FEA. Therefore, in this paper, a quick and accurate method for the calculations of motor parameters considering skew is suggested. The proposed method is verified by the comparison of calculated and experimental results.

• 한국환경과학회지
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• 제11권7호
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• pp.669-677
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• 2002

This study was conducted to investigate the characteristics of role of transport on aerosol concentration at Crate Lake, Oregon USA for 1988.3~1999. 5. The IMPROVE program is a cooperative measurement effort governed by a steering committee composed of representatives from USA federal and regional-state organizations. Also IMPROVE sampler is designed to obtain a complete signature of the composition of the airborne particles affecting visibility. According to 10-day backward isentropic trajectory analysis, the frequency of local, marine and Asian trajectory showed 33.1%(335 cases), 47%(478 cases), 5.2%(53 cases) respectively. The monthly variation of nss $SO_4^{2-}$, nss S, $NO_3^-$, K and C showed the double peak pattern, high in April~May and August~september and showed the lowest concentration in Winter. The other constituents concentration except for Cl$^{[-10]}$ , Na, Mg was high in local trajectory than marine trajectory. A ratio nss $SO_4^{2-}$ to $SO_4^{2-}$ was 90.5% in marine trajectory and 98% in local trajectory. It suggest that the aerosol in Crater Lake was effected by salt. The annual mean concentration of nss $SO_4^{2-}$ and nss S decreased but the springtime concentration increased.

• 한국기계기술학회지
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• 제20권6호
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• pp.947-956
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• 2018

This research has been conducted to design upright parts of hand-made vehicles with the purpose of reducing material and machining cost while ensuring structural safety. Aluminum knuckles were modelled with three parts in order to enhance design flexibility as well as to reduce CNC machining cost. A vehicle model was constructed in CAD program and simulated in ADAMS View in order to estimate joint forces developing during 20 degree step steering condition at 60km/h. The joint forces obtained in the vehicle dynamics simulation were used for the structural analysis in ANSYS and dimensions of knuckle parts were adjusted until the lowest safety factor reached 2.0. The weight of knuckle decreased by 50% compared to the previous version that was designed without the structural analysis. The overall manufacturing cost decreased by 33% due to the reduction in the material as well as the CNC machining effort.

• 보건행정학회지
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• 제24권2호
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• pp.136-142
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• 2014

Background: This study is to research on how hypertension control is associated with adherence in newly diagnosed hypertension patients. Methods: The study is based on 255,916 patients who were diagnosed with hypertension in 2009 and didn't have any previous medical history of hypertension or associated complication for the past year using data collected by National Health Insurance Corporation. Newly diagnosed hypertension patients are divided into two group by visiting medical center numbers (more than 300 days was adherence group, if not non-adherence group). Patients are considered to have successfully controlled their hypertension based on blood pressure measured by health examination. Chi-square test and logistic regression, repeated measured analysis of variance was used to analyze. Results: The relations between adherence and hypertension control show that 1.12 times of patients in adherence group was able to control their hypertension. The additional analysis proves that adherence group are more decreased level of blood pressure than non-adherence group except for patients who are over 70. Comparison of the average of systolic blood pressure and diastolic blood pressure between adherence and non-adherence groups shows that the blood pressure has been significantly among the adherence group. Conclusion: The study proves that constant treatment for hypertension could control the blood pressure and encourages patients to put more effort for persistent treatment. It also shows that hypertension treatment are more effective in younger patients than the elderly and strategies of approaching are different depending on age.

• 대한지리학회지
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• 제43권4호
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• pp.511-525
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• 2008

거주지 분화(residential segregation)는 도시 불평등을 심화하는 요인 중 하나이다. 본 연구는 거주지 분화의 원인에 대한 상이한 주장들을 살펴보고 사례분석을 통해 현실 적합성을 검증하고자 한다. 이론적 고찰은 일찍이 논의가 활발했던 미국도시의 인종 민족별 거주지 분화에 대한 것으로 한정하였으며, 거주지 분화가 소수민족의 주류사회로의 낮은 동화에 기인한다고 주장하는 지리적 동화론(spatial assimilation), 주택금융시장의 인종차별에 기인한다는 층화론(place stratification), 그리고 거주지선택에 있어 타민족에 대한 선입관과 자기민족에 대한 선호에 기인한다는 재기되는 민족성론(resurgent ethnicity)을 살펴보았다. 사례 연구로 시카고에 거주하는 아시아인의 거주패턴의 변화를 출신국가별로 지도로 그려 분석하였다. 1990년대를 통한 가장 큰 변화는 교외화와 재집중화로 요약될 수 있으며 이는 민족성론을 그리고 부분적으로 마나 동화론을 뒷받침한다.

• 대한기계학회논문집A
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• 제37권11호
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• pp.1429-1436
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• 2013

본 논문에서는 미분게임 이론과 다수준 계획법을 이용하여 차량 전복 방지 제어기를 설계하는 방법을 제안한다. 차량 전복 방지 문제는 비협조적 제로섬 2 인 미분게임으로 정식화된다. 미분게임의 균형해로 얻어지는 제어기는 모든 가능한 조향 입력에 대해 최악의 성능을 보장한다. 적은 계산량으로 미분 게임의 균형해를 찾기 위해 완화 과정을 가지는 다수준 계획법을 이용한다. 차량의 롤 운동을 억제하기 위해 능동 현가장치를 사용하면 차량의 횡방향 안정성이 상실되므로 이를 방지하기 위해 자세제어장치(ESP)를 이용한다. 시뮬레이션을 통해 제안된 방법이 미분게임의 균형해를 찾는데 효과적임을 보이고 설계된 제어기가 차량의 전복을 방지함을 보인다.

• 보건행정학회지
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• 제25권2호
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• pp.90-96
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• 2015

Background: This study aimed to research on how adherence and blood control could make a difference when it comes to develop complications. Methods: The study's subjects were 255,916 patients who were newly diagnosed with hypertension in 2009 using data collected by National Health Insurance Cooperation. Patients are considered as a group under adherence if visit days and prescription days are more than 300 days. Patients are considered to have successfully controled their hypertension based on actual value measured by National Health Insurance Cooperation and the study takes a look at whether they were diagnosed with complications of cerebrocardiovascular disease in 2012. Chi-square test and logistic regression was used to analyze. Results: Patients who were able to control their hypertension show 0.80 times chance of developing cerebrovascular disease, and 0.89 times chance of developing cardiocerebrovascular disease. The group of adherence shows lower chance of developing complication in general than the group of non-adherence. Conclusion: The study revealed that hypertension's constant treatment could control the blood pressure and prevent complications. It is important that encourages patients to effort for persistent treatment for reducing complication.