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파워 시프트 변속기가 장착된 농업용 트랙터의 자동 변속 알고리즘에 대한 실험적 검증
최상천 ( Sang Chun Choi ),손승락 ( Seung Rak Son ),윤희범 ( Hee Bom Yoon ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
최근 농업용 트랙터에 전자식 엔진과 전자 유압 변속기가 도입됨에 따라 사용자의 편의성과 연료 및 작업 효율을 향상시키기 위한 자동 변속 연구가 활발하게 진행되고 있다. 본 연구에서는 자동 변속 알고리즘이 적용 된 100kW급 파워 시프트 트랙터에서 사용자의 입력 속도를 추종하는 변속 데이터를 획득하였다. 먼저 목표 변속 단수를 결정하기 위해서 트랙터 제원을 기반으로 H단에 대한 엔진 속도와 트랙터 속도에 대한 관계 선도를 사용하였다. 이 선도를 통해 사용자 입력 속도에 해당하는 각 변속 단수별 엔진 속도와 Eco-Power 다이얼로 결정된 기준 엔진 속도의 관계로 최적의 변속 단수를 결정한다. Eco와 Power 모드에 따라 연료 효율이 높은 엔진 속도 또는 출력이 높은 엔진 속도를 기준으로 변속 단수를 결정한다. 변속 제어는 실시간으로 ECU와 트랙터 속도 센서에서 출력되는 엔진 속도와 부하 토크 그리고 트랙터 속도를 입력 받으며, 설정된 변속 선도를 기준으로 자동 변속을 한다. 트랙터 구동 중 발생하는 동력 손실, 부하 등을 고려하여 목표 속도에 대한 정상 속도의 범위를 1km/h로 설정하였으며, Eco모드와 Power모드에서 목표 변속 단수에 도달 후, 사용자 요청 속도와 측정된 트랙터 속도에서 정상 범위 내인 약 0.7km/h의 오차를 가졌다. 또한 변속 단수 결정을 통해 목표 변속 단수는 Eco모드에서 5단, Power 모드에서 4단이 결정 되었으며, 목표 속도에 대해 구동된 엔진 속도는 Eco 모드에서는 1378 RPM, Power 모드에서는 1795 RPM으로 구동되었다, 이를 통해 자동변속 알고리즘이 “Gear up throttle down” 원리를 적용된 것을 확인했다. 본 연구를 통해 파워 시프트 트랙터에 자동변속 알고리즘을 적용하여 실험적 검증을 하였으며, 이는 사용자의 편의성과 연료 및 작업 효율을 향상시킬 수 있을 것으로 판단된다.
최상분 ( Sang Bun Choi ),서정숙 ( Jeong Sook Seo ),한양천 ( Yang Chun Han ),김애란 ( Ae Ran Kim ),허진원 ( Jin Won Hur ),이성순 ( Sung Soon Lee ),이영민 ( Young Min Lee ),이혁표 ( Hyuk Pyo Lee ),김주인 ( Joo In Kim ),염호기 ( Ho K 대한결핵 및 호흡기학회 2007 Tuberculosis and Respiratory Diseases Vol.62 No.4
The Inhalation of certain freshly formed metal oxides can cause metal fume fever, which is an acute, self-limiting, flu-like illness. The most common cause of this syndrome is the inhalation of zinc oxide. The inhalation of zinc oxide can lead to tracheobronchiolitis, chemical pulmonary edema or to respiratory failure and acute respiratory distress syndrome(ARDS). We encountered a 43-years-old man who developed severe dyspnea after inhaling of zinc oxide while working for 5 hours in a closed space. He was diagnosed with ARDS and was treated successfully with glucocorticoid. We report a case of ARDS caused by the inhalation of zinc fumes. (Tuberc Respir Dis 2007; 62: 314-317)
급성 진정제 중독 추정 환자에서 플루마제닐의 투여: 위험도/이익 재평가
허재홍 ( Jae Hong Huh ),최상천 ( Sang Chun Choi ),임용균 ( Yong Gyun Lim ),샘슨램포탕 ( Samsun Lampotang ),박은정 ( Eung Jung Park ) 대한임상독성학회 2016 대한임상독성학회지 Vol.14 No.2
Purpose: The use of flumazenil administration in the emergency department is still controversial because of concerns about adverse effects. The present study was conducted to re-evaluate the risk-benefit ratio associated with flumazenil administration to patients suspected of having acute hypnotics and sedatives poisoning in the emergency department. Methods: A retrospective chart review study was conducted for patients whose final diagnoses were “poisoning” and “benzodiazepine” or “sedatives-hypnotics” from Mar. 2006 to Feb. 2015. The basal characteristics of the patients, including past medical history, ingredients and dose of ingested drug and co-ingested drugs were investigated. For patients administered flumazenil, responsiveness and time from admission to flumazenil administration were investigated with supplement. All collected data were analyzed in aspect terms of risk/benefit. Results: A total of 678 patients were included in our study. Benzodiazepine was the most common sedative/hypnotic drug prescribed, and the frequency of prescription continuously increased. The proportion of TCA as co-ingestion decreased from 13.1% to 3.9% in patients with acute sedative/hypnotic poisoning. Flumazenil was administered to 55 patients (8.1%), of which 29 patients (52.7%) were applied to contraindications. Fifty-three patients (96.4%) showed positive responsiveness, including partial responsiveness after flumazenil administration. No severe adverse events were identified. Conclusion: Based on the current trends in prescription patterns for sedative/hypnotic drugs, increased use of non- TCA antidepressants, and responsiveness to administration of flumazenil, benefit seemed weighted more in this study, although the observed benefits were based on limited results. Further prospective multicenter studies will be needed to optimize benefit-risk ratio.
고속열차 감속기의 상시감시시스템 설계 및 가변속주행시 안정성 향상을 위한 동특성해석
박병수(Park, Byung Su),김진우(Kim, Jin Woo),최상락(Choi, Sang Rak),송영천(Song, Young Chun) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.4
MRU(motor reduction unit) for KTX is a assembled complex structure that is equipped with a lot of parts at the express train KTX and that is the core power source operating variable speeds. This study is recorded the dynamic characteristics analysis results tested by EMA which is done through the parts and assembly test, transient analysis and stoped train test in order to design the online monitoring system for KTX MRU. And the mode shapes result from critical vibration frequency explain the relation with variable speeds of express train over 250 km/hr. Also these variable speeds make variable operational frequencies at pinion, axle gear mesh frequency and normal bearing fault frequencies. As the specified speed can make resonance with natural frequencies of the MRU, for the train operating stability, this study also presents the MRU's critical speeds calculated by the each train speed.
최상천 대구효성카돌릭대학교사회과학연구소 1998 사회과학연구 Vol.5 No.-
The central themes of Confucianism consist of a polarity which is the polarity of self-cultivation(修己; hsiu-chi) leading to personal self-realization and the ordering and harmonizing of the world(治人, 治國平天下). This polarity could fully concern only those with a vacation for political and social leadership-the superior men(君子; ch n-tzu). But the vision of ch n-tzu implied a duplex significance The chün-tzuo designated the hereditary nobles as a social class in the Warring States era on the one hand. But on the other hand, it suggested the ideal type of leaders in order to demand ch n-tzu's serious reflection and to legitimate their ruling. In the Analects(論語 Lun-y n) and in the Great Learning(大學; Ta-hs ch) Confucius himself states that "ch n-tzu cultivates himself in order to give rest to the people". The ch n-tzu can achieve complete self-realization only in his public vocation. It might be stated that a commitment to public service forms one of the basic criteria distinguishing the Confucian ideal of self-cultivation from some competing ideals and new-arising socio-political powers in that time. Conversely society can be harmonized and set in order only when men who have approached the ideal of self-realization are in public office. Here we find that Confucius devoted his life to idealize and stabilize the order of social stratum which consisted in the sage(聖人), chün-tzu, mean person and populace. And also in order to solidify those order he suggested the socio-political order as 君君臣臣父父子子, which was based primarily on one's conscientious adherence to the prescriptions of proper behavior(禮; li) and benevolence(仁; jin).