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서영교 ( Seo Youngkyo ) 공주대학교 백제문화연구소 2016 백제문화 Vol.0 No.55
餘昌은 한강유역을 수복하고 가야에 대한 백제의 영향력을 회복하기 위해 554년 관산성 전투를 결행했다. 12월 백제연합군이 관산성의 중요한 子城인 函山城을 함락시키면서 승리가 거의 굳어져 가고 있었다. 하지만 재앙은 생각지도 못한 곳에서 찾아들었다. 승리가 예상되자 아버지 성왕이 餘昌을 위로하기 위해 久陀牟羅塞로 순행하다가 신라군에게 잡혔고, 참수를 당했다. 소문이 퍼지자 백제군은 한강 하류에서 남하해온 신라 新州 김무력 군대에 무너졌다. 餘昌은 倭弓부대의 도움으로 간신히 목숨을 건졌지만 약 3만의 전사자를 낸 관산성 패전의 결과는 바로 나타났다. 554년에서 562년 사이에 가야의 10개국이 차례로 신라에 항복했다. 餘昌은 왜군을 끌어들여 다시 전쟁을 시작한다. 562년 7월 백제와 왜 연합군이 가야지역에 들어갔다. 하지만 신라의 생각지도 못한 白旗欺瞞전술에 걸려 왜군이 격파되고, 백제군도 1,000명의 전사자를 남기고 물러섰다. 그해 9월 백제연합군에 협조한 대가야도 사다함의 기병이 급습하여 도성 성문에 백기를 꽂으면서 완전히 제압당했다. In 554 Baekje Prince Yeochang(餘昌) started fight action to regain Han River. Yamato japan sent military aid to Baekje. Kaya also sent reinforcements. In December the Baekje Allies captured Ham Castle(函山城) in Okcheon Korea. Triumph almost it becomes firm. But disaster was found in places that never thought. Baekje King Seong(聖王) went to the fortress Kutamora(久陀牟羅塞)where Prince Yeochang was staying. The King was a prisoner in a silla army. And he was executed by Wagoner dork(司馬奴 都刀). Such rumors sprayed, Baekje army became dispirited. A new army of Silla came closer, Baekje was defeated. Baekje-Kaya army 30,000 was died. Prince Yeochang would dead without help of the Japanese archers. In 562 Kaya was surrendered to Silla. Baekje King Yeochang restart the war. Baekje-Yamato japan Allies headed to the region. But the Allies were lost in Kaya. Thousnd of Baekje soldier dead. Yamato japan army was deceived by the white flag. Shaking the white flag Silla soldier sent a fake surrender to Allies. Elsewhere the ambushed Silla soldier have attacked the Japanese army. Many japanese soldier were died and taken prisoner. Kaya regions were completely merged into Silla.
[기술논문] FMEA를 활용한 재제조 파워스티어링 오일펌프 시험법에 대한 최적화 연구
서영교(Youngkyo Seo),정도현(Dohyun Jung),유상석(Sangseok Yu),나완용(Wanyong Rha) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.1
Currently government certified test method for an automobile remanufactured products is insufficient. Thus many automotive parts in the remanufacturing market are lacking proper evaluation criteria and production of defective products are causing customer dissatisfaction. In this paper a power steering oil pump, which requires stringent manufacturing standards, is studied by the failure mode and effect analysis approach. The research suggested that the test criteria such as discharge flow characteristic test, tightness test, pulley run-out test, pressure switch operation test, low temperature test and rotation pressure durability test should be performed to evaluate the reliability of remanufactured power steering oil pumps. As a result of tests, the performance of remanufactured power steering oil pump satisfied the evaluation criteria of pressure switch operation test and low temperature test. However, the remanufactured power steering oil pump failed to satisfy the evaluation criteria on discharge performance test, tightness test and pulley run-out test. These performance evaluation tests proved the necessity of standard process for the remanufactured power steering oil pump.
7단 자동변속기용 오일 펌프의 재제조 공정기술 개발에 관한 연구
서영교(Youngkyo Seo),홍성도(Sungdo Hong) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.7
In this study, a remanufacturing process technology that includes a bushing assembly process and a polishing process of gear and housing was developed to restore the performance of used oil pump for a 7-speed automatic transmission. The suitability of this remanufacturing process technology for performance restoration was verified by comparing the volumetric efficiency for two remanufactured oil pumps and two original oil pumps. Based on the results over the five definite range of rpm, the volumetric efficiency of the remanufactured oil pumps was more than 95 % compared to the original oil pumps. Therefore, the suitability of the oil pump remanufacturing process technology developed through this study was verified. It was also found that the remanufactured oil pump was restored to a level equivalent to that of the original oil pump.