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정지연(Ji-Youn Jeong),강용진(Yong-Jin Kang),장훈(Hoon Jang),유지윤(Ji-Yoon Yoo) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 IPM(Intelligent Power Module)의 작동에 있어서 효율의 향상을 위한 스너버 회로 사용의 효과에 대하여 살펴본다. 고속 스위칭을 행하는 IPM에서 턴 온시에는 다이오드 역회복 특성에 의해 전류 오버슈트가 생기고, 턴 오프시에는 IGBT내부의 잔류 커패시턴스에 의해 서지전압이 생긴다. 이런 전류 맥동 및 서지전압은 IPM의 손실요인이 된다. 따라서 스너버 사용으로 이런 손실요인을 제거할 수 있음을 보이고 실험을 통해 고찰해 본다.
정지연(Jeong, Ji-Youn) 한일관계사학회 2017 한일관계사연구 Vol.57 No.-
본 논문은 조선전기 壹岐 지역의 조선통교 현황을 시기별, 통교자별, 교역품목별로 살펴봄으로써 그동안 주목받지 못했던 壹岐 지역의 통교실태를 파악하는데 목적이 있다. 『조선왕조실록』의 壹岐 관련 통교기사를 정리하여 분석한 결과 아래와 같은 특징이 확인된다. 조선전기 壹岐 지역의 조선통교 횟수는 총 610건이고, 통교자 명의는 68명이다. 壹岐 지역 통교자들은 성종대에 가장 활발하게 통교를 하였으며, 세조대·세종대·단종대 순으로 통교가 빈번하게 이루어졌다. 壹岐 지역 통교자들은 다섯 가지 그룹으로 분류가 가능하다. 첫 번째는 『해동제국기』에 壹岐지역을 分治하는 자들로 기재된 志佐, 佐志, 呼子, 鴨打, 鹽津留등의 諸酋使그룹이다. 두 번째는 壹岐의 代官으로, 여기에는 志佐氏가 지배한 壹岐唯多只郷의 代官인 眞弓氏와 呼子氏가 지배한 壹岐小于郷의 代官인 牧山氏가 해당된다. 세 번째는 사원에서 통교한 자들로, 松林院과 觀音寺 등의 주지 또는 승려의 신분으로 통교하고 있다. 네 번째는 倭司正이나 倭護軍, 萬戶등과 같이 조선의 관직을 받은 受職人그룹이며, 다섯 번째는 위 그룹의 통교자와 친인척 관계인 자들이나, 기타 壹岐지역의 지역명만 기재된 통교자들이다. 이들의 헌상품목은 크게 염료, 광산물, 한약재, 동물, 공예품 등으로 분류된다. 유황을 중심으로 한 일본 국내산 광산물 외에 염료나 약재 등의 남해산물도 많이 볼 수 있다. 壹岐 지역 통교자들의 헌상품을 받은 조선에서 회사품목으로 준 물품들은 피복류, 음식류, 동물류, 佛具류 등이다. 壹岐 지역은 조선에서 일본으로 오고가는 관문에 위치하였고, 왜구의 거점지로 인식되었던 곳 중 하나이기 때문에 壹岐 지역의 세력가들에게 통신사행에 대한 호송을 요청해야만 했다. 이에 조선 사행의 왕래시에 壹岐 지역 세력가에게 물품을 내려주고 護送 등을 요청하는 형식의 물품교류도 존재하였다. 이상, 壹岐 지역의 통교 현황에 대해 시기별, 통교인물별, 교역품목별로 나누어 살펴보았다. 향후 壹岐 지역 이외에 五島, 對馬島, 九州등 일본 각 지역의 통교현황에 대한 연구가 더해진다면, 조선전기 일본 제지역의 조선통교의 특징을 규명하는데 일조할 수 있을 것으로 기대한다.
윤대환,변정윤,최찬헌,백진웅,정지연,정연진,나창수,Youn, Dae-Hwan,Byun, Jeng-Yun,Choi, Chan-Hun,Baek, Jin-Ung,Jeong, Ji-Yeon,Jung, Yeon-Jin,Na, Chang-Su 경락경혈학회 2007 Korean Journal of Acupuncture Vol.24 No.3
Objectives : Aims of this study is to investigate the effects of $LU8{\cdot}KI7$ in rat induced by experimental focal ischemia. Materials and methods : The focal ischemia was induced by intraluminal filament insertion into middle cerebral artery. The groups divided into 6groups, control; no therapy group after ischemia-induced, AT1; acupuncture therapy group at $LU8{\cdot}KI7$ after ischemia-induced, AT2; acupuncture therapy at $LU8{\cdot}KI7$ bilaterally and the needle was twirled and rotated forward with the thumb of the right hand 9times, AT3; acupuncture therapy at $LU8{\cdot}KI7$ bilaterally and the needle was twirled and rotated forward with the forefinger of the right hand 9times, AT4; acupuncture therapy at$LU8{\cdot}KI7$ bilaterally and the needle was inserted to the direction following the flowing route of the meridian(digital direction), AT5; acupuncture therapy at $LU8{\cdot}KI7$ bilaterally, the needle was inserted to the direction following the flowing route of the meridian(digital direction) and the needle was twirled and rotated forward with the thumb of the right hand 9times. Acupuncture therapy was carried out 7times during 2weeks after focal ischemia-induced. The anti-apoptotic and neuroprotective effects of acupuncture are observed by Bax, Bcl-2, mGluR5, cytochrome c, Cresyl violet and ChAT-stain. Results : The intensity of Bax was decreased in AC1, AC4, AC5 group, was increased in AC2, AC3 group. The intensity of Bcl-2 was increased in AC2, AC3, AC4, AC5 group. The intensity of mGluR5 was decreased in AC1 group, was increased in AC4, AC5 group. The intensity of Cytochrome c was increased in ACI, AC2 group, was decreased in AC4, AC5 group. The density of neurons stained by Cresyl violet was increased in all group without control group. The density of ChAT was increased in AC2, ACS group. Conclusions : Our study suggests that AC5 group show anti-apoptotic and neuroprotective effects on cholinergic neuron in focal cerebral ischemia of the stroke in rats.
윤대환 ( Dae Hwan Youn ),변정윤 ( Jeng Yun Byun ),최찬헌 ( Chan Hun Choi ),백진웅 ( Jin Ung Baek ),정지연 ( Ji Yeon Jeong ),정연진 ( Yeon Jin Jung ),나창수 ( Chang Su Na ) 대한경락경혈학회 2007 Korean Journal of Acupuncture Vol.24 No.3
Objectives: Aims of this study is to investigate the effects of LU8·KI7 in rat induced by experimental focal ischemia. Materials and methods: The focal ischemia was induced by intraluminal filament insertion into middle cerebral artery. The groups divided into 6groups, control; no therapy group after ischemia-induced, AT1; acupuncture therapy group at LU8·KI7 after ischemia-induced, AT2; acupuncture therapy at LU8·KI7 bilaterally and the needle was twirled and rotated forward with the thumb of the right hand 9times, AT3; acupuncture therapy at LU8·KI7 bilaterally and the needle was twirled and rotated forward with the forefinger of the right hand 9times, AT4; acupuncture therapy at LU8·KI7 bilaterally and the needle was inserted to the direction following the flowing route of the meridian(digital direction), AT5; acupuncture therapy at LU8·KI7 bilaterally, the needle was inserted to the direction following the flowing route of the meridian(digital direction) and the needle was twirled and rotated forward with the thumb of the right hand 9times. Acupuncture therapy was carried out 7times during 2weeks after focal ischemia-induced. The anti-apoptotic and neuroprotective effects of acupuncture are observed by Bax, Bcl-2, mGluR5, cytochrome c, Cresyl violet and ChAT-stain. Results: The intensity of Bax was decreased in AC1, AC4, AC5 group, was increased in AC2, AC3 group. The intensity of Bcl-2 was increased in AC2, AC3, AC4, AC5 group. The intensity of mGluR5 was decreased in AC1 group, was increased in AC4, AC5 group. The intensity of Cytochrome c was increased in AC1, AC2 group, was decreased in AC4, AC5 group. The density of neurons stained by Cresyl violet was increased in all group without control group. The density of ChAT was increased in AC2, AC5 group. Conclusions: Our study suggests that AC5 group show anti-apoptotic and neuroprotective effects on cholinergic neuron in focal cerebral ischemia of the stroke in rats.
항공사 셀프서비스 테크놀로지 품질이 경험가치, 태도, 지속적 이용의도에 미치는 영향: 사전 고객준비도의 조절효과
변민섭 ( Byeon Min-seop ),정지연 ( Jeong Ji-youn ) (사)한국마이스관광학회 2023 MICE관광연구 Vol.23 No.2
The purpose of this study is to examine the influences of self-service technology quality(SSTQUAL) at airport on experience value, attitude, and continuous use intentions. A total of 301 data were analyzed by SPSS25 and AMOS25. Enjoyment, assurance, design, and customization had positive effects on emotional value, and functionality had a positive effect on economic value. Furthermore, emotional and economic value had positive effects on attitude, leading to continuous use intentions. In terms of consumer readiness, positive moderating effects of role clarity, ability, and intrinsic expectation were partially supported. This study has academic significance in that it empirically verified that customer readiness is necessary to maximize the positive impact of SSTQUAL on customer service use. In addition, it has practical significance in that it pointed out the importance of customer participation education along with SSTQUAL improvement.
박종승 ( Jong Seung Park ),윤대환 ( Dae Hwan Youn ),나창수 ( Chang Su Na ),조명래 ( Myeung Rae Cho ),정연진 ( Yeon Jin Jung ),정지연 ( Ji Yeon Jeong ),김원재 ( Won Jae Kim ),최찬헌 ( Chan Hun Choi ) 대한경락경혈학회 2006 Korean Journal of Acupuncture Vol.23 No.3
Objectives: Acupuncture using a tonification or sedation techniques method is used as a controlling the medication for an early stroke in the Korean medicine. LR3 has indicatons of headache, vertigo, facial paralysis, apoplexy, epiepsy as the source acupoint of a Liver meridian. So this study is aims to investigate the anti-apoptotic and neuroprotective effects of acupuncture on the focal ischemia induced by intraluminal filament insertion in rats. Methods: The focal ischemia was induced by intraluminal filament insertion into middle cerebral artery. The animals were divided into seven groups (n=8 in each group): Normal, intactness group; Conrol group, no therapy group after being ischemia induced; MA-1, acupuncture perpendicularly without Tonification or Sedation techniques at LR3 after being ischemia induced; MA-2, acupuncture obliquely towards the knee at LR3 after being ischemia induced; MA-3, acupuncture obliquely towards the toe at LR3 after being ischemia induced; MA-4, acupuncture obliquely towards the knee and rotate 9 times in a clockwise direction at LR3 after being ischemia induced; MA-5, acupuncture obliquely towards the toe and rotate 6 times in a counterclockwise direction at LR3 after being ischemia induced. The anti-apoptotic and neuroprotective effects of Acupuncture techniques of tonification or sedation at LR3 are observed by mGluR5, Bax, Cresyl violet, ChAT-stain and NGF. Results: The intensity of mGluR5 and the density of ChAT was increased in MA-1 group. The intensity of Bax was decreased in MA-3, MA-4 group. The density of neurons stained by Cresyl violet and ChAT was increased in MA-2, MA-3, MA-4, MA-5 group. The density of neurons stained by NGF was only increased in MA-4 group. Conclusions: Our study suggests that acupuncture perpendicularly without Tonification or Sedation techniques and obliquely towards the knee and rotate 9 times in a clockwise direction(Tonifying technique) at LR3 after being ischemia induced at LR3 shows anti-apoptotic and neuroprotective effects on cholinergic neuron in focal cerebral ischemia of the stroke in rats.