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아크 소호용 세라믹 분말을 이용한 높은 차단용량 및 고내구성을 갖는 초소형 퓨즈 설계
강창룡,진상준,이예지,윤재서,노성여,Kang, Chang yong,Jin, Sang Jun,Lee, Ye Ji,Youn, Jae Seo,Noh, Seong yeo 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.4
Recently, inverter control systems have attracted immense attention to increase the energy efficiency. However, such systems use repeated on/off high currents for linear operation control, instead of the prevalent step variable current control method. Hence, there arise concerns of personal and property damage, especially due to the durability, explosive characteristics, and operating speed of the fuse, which is responsible for safety and is one of the internal components using current control. Therefore, in this paper, we propose an IEC60127-4 SMD sub-miniature fuse, consisting of Ag-Cu alloys and ceramic powder for arc soothing. The IEC60127-4 SMD sub-miniature fuse has high durability and cut-off capacity, and operates safely in dangerous circumstances caused by the inverter control system.
선박·해양 구조물용 YS 460 MPa 강재의 용접금속 특성에 미치는 PWHT의 영향
강창룡,정상훈,Kang, Chang-Yong,Jeong, Sang-Hoon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.4
This paper has an aim to study the effect of PWHT(for 140min. at $600^{\circ}C$) on FCAW weld metal properties (tensile, charpy impact and CTOD value) of YS 460 MPa steels for ship and offshore structures. On the basis of these study, it was found that strength was decreased and elongation was increased by PWHT. These phenomenon resulted from the reduction of acicula ferrite volume fraction by grain growth. Also, Charpy impact and CTOD value were decreased by PWHT. These phenomenon resulted from grain growth. Because the grain boundary grown by PWHT can play a role as crack initiation site and make the crack propagate more easily. Although weld metal properties were decreased by PWHT, tensile and impact properties could meet the class societies requirements for welds of YS 460 MPa steel, but decrease of fracture toughness need to be consider seriously.
25Cr-7Ni-4Mo-0.2N 슈퍼 2상 스테인리스강의 기계적 성질에 미치는 χ상의 영향
강창룡 ( Chang Yong Kang ),김재환 ( Jae Hwan Kim ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.3
This study was carried out to investigate the precipitation behavior of χ phase and effect of χ-phase which precipitated at the initial stage of aging on mechanical properties of 25%Cr-7%Ni-4%Mo-0.2%N super duplex stainless steel. χ-phase was precipitated mainly at the interface of ferrite/austenite phases and inside of the ferrite phase at the initial stage of aging, and it was transformed into σ-phase with an increase of aging time. The ferrite phase was decomposed into new austenite(γ2)phase and σ-phase by aging treatment. The hardness and tensile strength of the initial stage of aging when χ-phase was precipitated did not changed considerably, while elongation rapidly decreased. Accordingly, it is considered that χ-phase didn`t affect the hardness and strength significantly, but it affected the elongation.
강창룡 ( Chang Yong Kang ) 제주대학교 탐라문화연구소 2004 탐라문화 Vol.0 No.25
This study deals with the adrninistration of the Jaseon government, both central and local, concerning Chinese who were drifted to its territory in the mid 17th century. The main discussion in the study is focused on a group of Ming merchants who accidentally landed on Jeju Island in 1667(the 8th year of the King Hyeonjong's rule), dealing with the details such as their job, name, age, birth place, the list of goods carried in their ship, measures of the Joseon government to send them back, and the general policy of local government for handling the Chinese related matters. It was on May 23 in 1667, the 8th year of the King Hyeonjong's rule, that a group of 95 Ming merchants lost their trade route to Japan and had to land at the coast of Gaekkak, Yerae-ri, Daejeong-hyeon of Jeju. The merchants, among them was a government-sponsored merchant named Lian yan guan from Fujan Province of Ming China, had trade goods in their ship such as white confections, deer hide, herbal medicines and good-quality silk. Most of these Ming merchants were found to have come from Quan zhou fu, tong An Xian, tin tiang xian, Nan an xian, zhang zhou fu and zhang tai xian. Records show that the arrival of Ming merchants on May 23 in 1667 was preceded by other groups of foreigners who arrived, also accidentally, at Sameup of Jeju on February 9 in 1652(the 3rd year of the King Hyojong's rule). In total, two Ming ships brought 123 Chinese merchants. The news of the 1667 incident was promptly delivered to the court on June 21 by Hong Cheo-hu, Governor of JeoIla-do, and a cabinet meeting was held two days later, on June 23, to decide how to deal with the Ming merchants. Views of the government ministers were divided. Members from the non-mainstream faction of Seoin( 'party of the West' ), such as Jeong Chi-hwa(Chief Minister in the Right), Yu Hyeok-won(Provincial Governor), Yi Gyeong-eok(Justice Minister}, O Jeong-il(Mayor of the Capital), Hong Myeong-ha(Prime Minister) and Kim Jwa-myeong(Military Minister), insisted that the merchants should be sent back to their home where Ching had toppled Ming. By contrast, members from the mainstream faction, including Min Yu-jung (Chief Royal ecretary), Seong Ji-seon, Yi Yu-sang, Nam I-seong, Yi Dan-ha, Bak Se-dang, Yi Sang-ik, Yi Ji-ryeom, Gwon Gyeok, had a view that they should be sent to where they wanted to go to. The opinion of the latter, that Joseon should respect Ming as the only authoritative dynasty of China and disregard Ching as a regime of "northern barbarians", succeeded in persuading the ruling faction, Noron(Elders' Discourse}, of Seoin. Accordingly, a decision was made to send the 95 Ming merchants to China under the reign of the Ching Dynasty. The 28 Chinese merchants who landed at Jeongui-hyeon of Jeju Island on February 9 in 1652 were also sent to Beijing, China. On June 14 of the same year, King Hyojong decided to simplify the existing report system and ordered that all foreigners drifted to his territory should be dealt with according to the decision of Bibyeonsa (Border Defense Council) without reporting to army or navy commanders. In 1657(the 8th year of the King Hyopng's rule), a group of influential statesmen, including Song Jun-gil and Song Si-yeoL argued that to maintain the traditional allegiance to "civilized China", all the official documents of their government, including memorials sent up to the throne and royal edicts, should avoid using reign titles of Ching. On May 25 in 1670(the 11<sup>th</sup> year of the King Hyeonpng's rule), another Chinese ship was drifted to Geutdeunggae of Jeongui-hyeon, Jeju Island. No Jeong, governor of Jeju, acceded to the request of the Chinese merchants by allowing them to sail back to Nagasaki. Japan. When yet another Chinese ship was drifted to the island in 1675(the 1<sup>st</sup> year of the King Sukjong's rule), the Jeju governor kept the ship from coming ashore. The governor didn't make an official report of the incident for the court, and gave admonition for his people to keep it in secret. On December 10 in 1693(the 19<sup>th</sup> year of the King Sukpng's rule), a Chinere ship canying 32 Ching merchants, including cheng gan-shun from liangningfu in south China, was wrecked at a coast of Gwideok-ri, east of Myeongwoljn. The Ioc.al government acceded to their request and issued a written certificate to ensure their safe passage in their return purney.
휴대용 이차전지 보호 시스템용 전류 감지 동작형 보호소자의 퓨즈 가용체 설계
강창룡(Chang-Yong Kang),김은민(Eun-Min Kim) 대한전기학회 2018 전기학회논문지 Vol.67 No.12
Portable electronic devices secondary batteries can cause fire and explosion due to micro-current change in addition to the situation of short-circuit inrush current, safety can not be secured with a general operation limited current fuse. Therefore, in secondary battery, it is necessary for the protector to satisfy both the limit current type operation in the open-short-circuit inrush current and the current detection operation characteristic in the micro current change situation and for this operation, a fuse for the current detection type secondary battery protection circuit can be applied. The purpose of this study is to design a protection device that operates stably in the hazardous situation of small capacity secondary battery for portable electronic devices through the design of low melting fuse elements alloy of sensing type fuse and secures stability in abnormal current state. As a result of the experiment, I-T and V-T operation characteristics are satisfied in a the design of the alloy of the current sensing type self-contained low melting point fuse and the resistance of the heating resistor. It is confirmed that it can prevent accidents of short circuit over-current and micro current change of secondary battery.
진동제어에 의한 정밀기기의 고성능화를 위한 고강도 및 고감쇠능 합금개발
강창룡(CHANG YONG KANG),김익수(IK SU KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.6
The effect of the addition of Co and N and subzero treatment on tensile strength and damping capacity was investigated in Fe-Cr-Mn alloy. Austenite was transformed into martensite by cold rolling increasing the degree of cold rolling led to an increase in the volume fraction of martensite. Th damping capacity linearly increased with increasing volume fraction of ε martensite in cold rolled specimens and subzero treated specimens after cold rolling. The volume fraction of εmartensite, tensile strength and damping capacity was also increased by the addition of Co, while this treatment decreased the elongation. However, the volume fraction of ε martensite, elongation and damping capacity were reduced by the addition of N, although the tensile strength increased. Tensile strength and damping capacity werealso increased by subzero treatment, while elongation decreased.