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박정현 전남사학회 2002 역사학연구 Vol.19 No.-
商品經濟的發展不僅對江南農村經濟的變化, 對農村社會也産生了不小的 影響。1930年代江南農村不再處于穩定的結構之中, 在直接受至商品經濟影響的同時從傳統社會中擺脫出來, 持續着異質化的過程。江南農村的變化沒有帶來包括地主佃農關係在內的社會結構的變化。但是這충變化和現代性有一定的距離, 幷一直和傳統性有聯系, 盡管如此, 타不能說是无意義的、表面的、量的變化。在江南農村, 包括在商品經濟內的農民生活, 土地所有權的變化, 副業的一般化, 流動性的增加, 家族關係的變化, 意識的變化等在農村社會正發生着各충各樣的變化。本文旨在對商品經濟發展下江南農村社會發生了즘樣的變化, 對此農民們的對應方式如何進行詳細的探討。 江南農村的日常生活雖然帶有흔多傳統因素, 但是從經濟生活開始漸漸受到商品經濟的影響。在土地所有方面, 1930年代經濟蕭條時期農民想維持田面權都흔困難。因此農民中轉賣田面權, 棄農的人數增加, 永佃制逐漸衰退, 農村的土地所有權漸漸一元化。在家族關係上, 開始擺脫傳統的家父長制, 由于婦女參與勞動因而女性的在家庭中的地位提高了。령一方面, 因爲放棄農業人口的增加, 農村社會的流動性增加了, 農村人口不斷涌進城市。這충流動性已經對傳統的親族關係和家庭的穩定構成了威脅。離開農村進入城市的離鄕勞動者在城市里主要成爲産業工人和手工業工人, 從這一点可以看出, 江南農村的變化與該地區的工業發展有着密切的聯系。 想要准학地掌握農村居民在意識上的變化是一件常困難的事。但是, 大體上來說在意識形態方面1930年代江南農民同時具有傳統和現代雙重性格。他們在生活和習俗上維持着傳統性, 雖然具有排他的一面, 在經濟方面却相對較具有合理性, 幷能動地發生着變化。1930年代江南農村社會雖然在結構土沒有發生變化, 但是農民存在的方式却産生了흔大的變化。 農村社會的這충變化使農村的經濟因素産生了新的分配。農村勞動力在市鎭的非農産業部門從事勞動, 這樣農村勞動力的就業結構變得多樣化了。例如, 由于曾經是重要農副業的桑田的增加沒能給傳統的糧食生産帶來大的沖擊, 因而雖然沒有影響土地的再分配但是土地的利用率提高了。而且, 這충變化改變了農家經濟的性格。對農家經濟市場的依賴加强, 農家經濟的平衡有相當大一部分得從市場的交換過程中尋조。農村經濟從單一的、封閉式的傳統經濟結構轉變爲一定程度同時具有市場性和開放性的多層次經濟結構。 農村和現代工業相連的過程順利時農村的社會結構發生了흔大的變化。費孝通分析的吳縣開弦弓的變化就是江南農村變化的一個實例。卽, 由于經濟恐慌養蠶業衰退, 購買力下降, 隨之加速了農村的衰退。但是開弦弓通過對蠶桑進行改革使農村工業獲得成功, 겁大地改變了農村社會。相反, 遠離城市的偏遠農村仍然停留在傳統的關系中。江南農村的變化活躍在城市近郊。至此, 我們探討的江南農村的變化雖然不是專一地産生的, 但至少不可否認, 這一變化逐漸擴散, 對于在農村社會不斷增加現代化因素以及對江南農村社會的發展起了積겁的作用。
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Al 분말의 점화열을 이용한 Sialon 분말 제조에 관한 연구
박정현,전병세,이은창 한국세라믹학회 1986 한국세라믹학회지 Vol.23 No.2
The mixture of (opalit+Al) powder was ignited by electric shock for the preparation of sialon powder by changin the contents of Al. The formation reaction of sialon was investigated by heating the specimens of ignited mixture (opalit+Al) in nitrogen atmosphere at various temperature. The phases existing inthe specimens nitrided between 1400 and 1$600^{\circ}C$ were found $\beta$-sialon 15R-sia-lon $Al_2O_3$ and AlN but the mixture $\beta$-sialon and 15R-sialon was finally acquired by heating the ignited mixture of (Al 50%+opalit) at 175$0^{\circ}C$ for 3hours in nitrogen atmosphere.
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알루미나를 첨가한 코디어라이트계 결정화 유리의 소결거동 및 결정화 특성
박정현,노재호,성재석,구기덕 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.7
The MgO-{{{{ { {Al }_{2 }O }_{3 } }}-{{{{ { {SiO }_{2 } }_{ } }}system containing alumina powder was fabricated sintered at various temperature and analyzed in order to study the sintering mechanism and crystallization characteristics. The specimen composed of glass powder with average particle size of 8.27 $\mu\textrm{m}$ and 0-40 vol% alumina powder were sint-ered for 3 hrs at the temperature between 850$^{\circ}C$ and 1350$^{\circ}C$ The sintering mechanism consists of the redis-tribution of particles occuring at 750$^{\circ}C$ and the viscous flow at 850∼950$^{\circ}C$. The degree of crystallization and sintering temperatue were dependent upon the ratio of glass/alumina. The second phase from the reaction between glass and alumina was not observed which was confirmed by XRD and properties analysis. The density dielectric constant and specific resistivity of specimen were 2.30∼3.26g/cm2 5.8∼7.38 at 1 GHz density dielectric constant and specific resistivity of specimen were 2.30∼3.26g/cm3 5.8∼7.38 at 1GHz and 1.23∼4.70${\times}$107 $\Omega$$.$m respectively.
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CaO를 첨가한 2.5Y-TZP 세라믹스의 저온열화 거동
박정현,이한주,문성환,박한수 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.5
The effects of CaO addition on the low temperature degradation behavior of 2.5Y-TZP ceramics were investigated. Y2O3-CaO-ZrO2 ceramics were prepared from the commercial Y-TZP powder added within 1 mol% of CaO. Fully tetragonal phase could be obtained at each composition under sintering condition of 1500$^{\circ}C$ for 1 hour. As the amount of CaO increased, grain size was decreased. From the result of heat treatment at 200$^{\circ}C$, volume fraction of monoclinic phase formed on the surface of each specimen was decreased with higher CaO amount. Stability of tetragonal ZrO2 phase for low temperature heat treatment was increased by CaO addition without the degradation of mechanical properties.
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재발된 누선과 안와 선양낭포암에 대한 전안와제거술 - 증례보고 -
박정현,김영수,최희윤,고용,오성훈,오석전,Park, Jeong Hyun,Kim, Young Soo,CHoi, Hee Yoon,Ko, Yong,Oh, Seong Hoon,Oh, Suck Jun 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.3
A 54-year-old woman presented with an exophthalmos and a mass on her right eye, which proved to be recurred adenoid cystic carcinoma of the lacrimal gland. Orbital CT and MRI showed that tumor was located in the right orbit, but skin over right eye brow was also involved. There was no visualization of tumor extension into the intracranial compartment. The authors have performed an en bloc orbitectomy. Although en bloc orbitectomy is known to be useful in reducing recurrence, this case showed the tumor recurrence and even distant metastasis that occurred after total tumor removal via en bloc orbitectomy. As adenoid cystic carcinoma of lacrimal gland is known to have high rate of recurrence and metastasis, en bloc orbitectomy should be performed to reduce local advancement and distant metastasis. In case of distant metastasis, radiotherapy could be useful strategy in selected case.
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박정현,황석준,남주석 경상대학교 농업생명과학연구원 2018 농업생명과학연구 Vol.52 No.6
본 연구에서는 국내에서 주로 사용되는 채소 정식기를 대상으로 전체적인 작동 특성을 분석하였다. 식부장치 거동에 영향을 주는 주요 구성요소 및 동력전달경로를 파악하였으며, 식부장치의 링크 구조를기구적으로 분석하고 3D모델링 및 시뮬레이션을 수행하였다. 이를 바탕으로 식부호퍼 극하단점의 궤적을 분석하였다. 또한 엔진회전속도 및 식부변속단수 변화에 따른 주간거리를 도출하고 필드시험을 통해검증하였다. 주요 결과로써, 식부장치는 10개의 링크와 13개의 회전 조인트로 구성된 1 자유도의 기구이며 각 부분들은 4절 링크식으로 구성되어 있었다. 링크장치의 거동에 의해 식부호퍼는 일정한 자세를유지하면서 연직 방향으로 묘를 심어준다. 동력은 엔진을 통해 주행부 및 식부로 전달되었으며 식부장치의 최대 및 최소 주간거리는 각각 428.97mm, 261.20mm로 나타났다 In this study, the operational characteristics of a domestic vegetable transplanter were investigated. The main functional components and power path of the tranplanter were analyzed. Thelink structure of transplanting device waskinematically analyzed, and 3D modeling and dynamicsimulation were performed. Based on this analysis, the trajectory of the bottom end of thetransplanting hopper was analyzed. Also, the plant spacing according to the engine speed andthe shifting stage of transplanting transmission was analyzed and verified by field test. As mainresults of this study, the transplanting device is one degree of freedom(DOF) 4-bar link typemechanism which comprises 10 links and 13 rotating joints. The transplanting hopper plantsseedlings in a vertical direction while maintaining a constant posture by the links of transplantingdevice. The power is transmitted to both the driving part and transplanting part from theengine, and the maximum and minimum plant spacing of the transplanting device were 428.97mm and 261.20 mm.
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박정현,이홍섭,김대호,Park, Jeong-Hyeon,Lee, Hong-Seop,Kim, Dae-Ho 한국전자통신연구원 1989 전자통신 Vol.11 No.3
본고에서는 최근 각광 받고 있는 ASIC 설계기술에 대해 그 설계과정과 설계방법을 언급하고, ASIC 설계를 위한 기술을 CMOS 게이트 어레이(2um : Double Metal Layer)를 중심으로 타이밍을 고려한 설계기법, 신뢰도를 고려한 설계기법, 테스트를 고려한 설계기법, 최적 설계기법, 페키지 및 베이스 어레이 선택방법 등으로 나누어 제시했다.
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