반구 및 환상형 마이크로 표면 돌기의 트라이볼로지 특성 비교 연구

趙星山 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-

Finite element analysis of adhesive contact of hemispherical and torus micro surface bumps was conducted. Pull-off force and variation of maximum equivalent stress in the bump were obtained while the bump contacts with a rigid plane and then separates from the plane. The analysis results for the hemispherical and torus bumps were compared under the condition that the radius of outer boundary of bump is same. The results shows that the pull-off force is smaller for the hemispherical bump than the torus bump so that the hemispherical bump is superior to the torus bump in preventing the stiction and reducing the friction force. However, the same contact force generates greater equivalent stress in the hemispherical bump than the torus bump. Hence, the hemispherical bump is more likely to collapse plastically than the torus bump. It is recommended that the bump type is selected depending on the contact force.

18세기 후반~19세기 전반 조선 지식인의 語文 인식 경향

조성산 서울대학교 규장각한국학연구원 2009 한국문화 Vol.47 No.-

In this study, I have seen various aspects resulted from spoken language problems and have finally tried to disclose how universality of Sino-centrism and specificity of Chosŏn had been combined and had cracked. The contemporary intelligent at the time happened to expand their vision through which they could see the system of Chinese writings relatively by attaching voice to signal system of Chinese characters, which made themselves understand peculiarity of Chosŏn's unique spoken language therewidth. In addition, it pushed forth their further recognition to problems of the unity of the written and spoken language and compilation of books of connotation and notes translated and explained in details. Besides, they have found transition toward the spoken language in literary style and new interest in Chosŏn’s spoken expression. This shows how and in what way the medieval universality of Chinese writing system had been cracked and transformed by the peculiarity of voice. Increase in interest in the spoken language cracked soundless signal system of the Chinese writing system and expanded such expressions as were based upon Chosŏn’s own unique spoken language, which played an important role in advancing into their community with the same spoken language.

전통 목조 건축물의 구조해석에 의한 안전성 평가

조성산,김형기,박복만 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 논문집 Vol.9 No.4

18세기 후반~19세기 전반 ‘朝鮮學’ 형성의 전제와 가능성

조성산 연세대학교 국학연구원 2009 동방학지 Vol.148 No.-

근대 이후 민족담론을 기반으로 형성된 조선학은 각 민족 사이의 경계를 분명히 하고 조선만의 고유성을 강조하는 방향으로 이루어졌다. 그러한 문제의식 속에서 조선후기 이루어진 조선에 대한 지식들도 모두 근대 조선학의 자장 안으로 포섭되었다. 하지만 중세에는 근대의 민족담론과는 다른 ‘중세 帝國의 논리’가 있었다. 중세 제국 하에서는 근대와 같이 각 민족 단위의 경계가 분명하지 않았다. 제국의 질서는 제국이라는 중심과 그 주변으로 관계가 설정되어 있었다. 그렇다면 중세에 존재했던 조선에 대한 지식체계는 근대의 조선학과는 그 맥락이 다를 수밖에 없었을 것임은 자명하다. 본 글은 이러한 문제의식을 가지고 조선후기 형성된 조선학의 내적 구조를 밝혀보고자 하였다. 내적 구조를 밝히기 위하여 전제 작업으로서 먼저 조선학 형성의 외부를 살폈다. 明淸交替 이후 동아시아에는 공통되게 자문화중심주의가 만연하였다. 명나라로 대변되던 기존 중화 질서가 해체되고, 夷狄 왕조인 淸나라가 집권하면서 조선, 일본, 베트남에서 다양한 형태로 자신의 문화와 관습을 존중하고자 하는 사유가 발전하였다. 명청교체는 동아시아 사회의 ‘지역성’을 일깨웠던 것이다. 하지만 이러한 지역성 문제는 단순히 지역성 문제로 한정되지 않았다. 당시 제기된 지역성 문제는 그 내면에 보편성에 대한 고민을 전제로 하고 있었다. 보편성에 대한 새로운 사유들이 이 지역성 문제에 담겨있었던 것이다. 중화가 해체되고 夷狄으로 여겨지던 지역의 세력들이 자신들의 문화를 내외에서 존중받기 위해서는 자신들의 지역성을 보편성, 즉 중화라는 이름으로 수식하는 과정이 필요했다. 그 과정에서 그들은 중화라는 보편성을 새롭게 자각하게 되었던 것이다. 중화는 기존에도 문화주의의 의미를 지녔지만 이 시기 오면서 더욱 문화주의적인 성격이 강조되었다. 그러한 사유경향은 조선에도 수용되었다. 조선의 北學派는 이러한 지적 경향을 수용하여 조선의 정체성을 새롭게 구성하였다. 그들은 중화를 보편문화로서 인식한 바탕 위에 이를 역사적으로 구성된 것으로 보았다. 그러하기에 특정 시대와 지역의 중화문화를 전범으로 삼는 것이 갖는 문제점을 인지하고, 조선의 독창성에 대하여 고민할 수 있었다. 중화가 어차피 구성된 것이라면 조선의 문화도 그 중화 문화의 엄연한 한 부분으로서 나름의 보편성을 획득할 수 있다는 논리였다. 조선이 중국과의 관계 속에서 자신의 정체성을 구성하였던 것에는 조선이 위치했던 지정학적 위치와 그에 따른 중심부적 특성이 작용하였다. 조선은 중국 제국의 중심에서 비교적 가까운 위치에 처해있었던 것이다. 반면에 일본은 조선보다 중심에서 먼 거리에 위치하였기 때문에 자문화의 강조는 더욱 직접적인 형태로 나타날 수 있었다. 심지어 國學의 경우에서 보이듯이 일부 일본의 지식인들은 중국과의 관계 설정 없이 자신의 지역성이 갖는 중화성을 강조하였다. 베트남도 제국의 주변부에 위치하였기에 스스로 皇帝를 칭할 수 있었다. 이러한 일본과 베트남의 모습은 조선과는 다른 정체성을 구성하였던 그들의 주변부적 입장을 보여준다는 점에서 주목할 만하다. 본 글은 조선후기 조선학 형성의 외부와 내부를 살펴봄으로써 근대 민족국가 속에서 이루어진 조선학과 중세 중화주의 시대에 있었던 조선학과의 연속성과 차이점을 조명하여 양자 사 ... Chosŏn Studies formed after the modern period have been based on national discourse, which clarified the division between each nation and reinforced its uniqueness as Chosŏn Dynasty. Thus, most of the knowledges in Chosŏn studies made in the latter half of Chosŏn Dynasty can be included in the influential field of Modern Chosŏn studies. However, for the premodern period, logics of the premodern which can be distinguished from the modern national discourse, had influenced the Chosŏn studies. For example, in premodern period, there was no clear distinction between races, and the order of empire was established as the empire in the center and its neighboring area. It seems evident that the system of knowledge about Chosŏn Dynasty in premodern period is formed on the basis of different premises from those of modern Chosŏn Studies. In this study, I tried to disclose the internal structure of Chosŏn Studies that had been established in the latter half of Chosŏn Dynasty in this perspective. To reveal the internal structure, I started by looking into the outer part of Chosŏn Studies as a proposition work. The ethnocentrism has been commonly dominant in the East Asia after the replacement of Ming and Qing Dynasty. At the time, the existing Sino-Centrism led by Ming Dynasty fell apart, and the foreign dynasty of Qing took over the reign, which made the neighboring countries such as Chosŏn, Japan, and Vietnam respect their own culture and customs in various ways. In other words, the replacement of Ming and Qing Dynasty awoke ‘locality’ in societies among the East Asia. However, the locality they developed was not limited to merely emphasizing their own uniqueness. While developing their ‘locality’, the societies also had to consider the concept of ‘universality’ inherent in the concept of their ‘locality’. As previous way of Sino-centrism broke down, the neighboring countries somehow had to put the concept of universality, the new way of Sino-centrism, in their own locality to gain respect from the word including their own and outside of it. Therefore, they started to re-interpret the universality of Sino-centrism. Sino-centrism's characteristic as a culturalism, which had been understood as so until then, started to be even more emphasized around this period. Such trend was adopted to the Chosŏn Dynasty, especially to Pukhakpa(北學派: School of Northern Learning), who tried to find a new identity of Chosŏn on the basis of this trend. They regarded Sino-centrism as what had been historically reorganized as a universal culture. As a result, they criticized the traditional way of Sino-centrism, such as taking a specific period or locality as a model of development in Chosŏn, and could focus their thoughts to the originality of Chosŏn locality. It was reasonable in the sense that once Sino-centrism was made up, the culture of Chosŏn Dynasty might acquire universality of its own as a part of Sino-centrism culture. This identity was influenced by the geopolitical position of Chosŏn Dynasty and its subsequent characteristics in relation to China. Unlike Chosŏn Dynasty, which was located relatively close to the center of China, Japan and Vietnam were located in farther region where they could relatively emphasize more of the uniqueness in their own culture. Some Japanese intellectuals claimed to have their own Sino-centrism provided by their own locality, instead of establishing it in relations to the China. Also, in Vietnam, which was located in the area surrounded by the empires, could called their own king, the Emperor. It is notable to observe the case of Japan and Vietnam, in the sense that these cases show us their position as surrounding nations of China, and that it had formed identity unlike Chosŏn Dynasty.

서평: <<朝鮮後期 政治思想 硏究>>(정호훈 저)

조성산 한국사연구회 2004 한국사연구 Vol.126 No.-

와이어 방전가공에서 최적 휴지시간에 관한 실험적 연구

趙星山 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

A major shortcoming of wire electric discharge machining is relatively slow machining speed that is associated with deionization of dielectric fluid. In this study, the effect of primary and secondary OFF-times on the table feedrate has been experimentally investigated during wire electric discharge slitting processes in order to reveal the characteristics of deionization process and to find the optimal primary and secondary OFF-times. The tests were conducted at various discharge durations. It is demonstrated that the time for deionization reveals a stochastic nature so that OFF-time control using primary and secondary OFF-times is an effective strategy to improve the machining speed. Moreover, the secondary OFF-time has more significant influence on the machining speed than the primary OFF-time, and thus more attention should be given to the selection of the secondary OFF-time. There exist optimal values of primary and secondary OFF-times depending on the discharge duration, and the optimal values increase with the discharge duration.

마이크로 외팔보 점착방지용 돌기의 설계변수 분석

趙星山 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-

Micro-bumps have been recognized to prevent stiction in MEMS that hinders proper operation and reduces the durability. Analytical models have been developed to describe separation phenomena of cylindrical and hemispherical bumps from the surface of semi-infinite body. The developed model is employed to obtain the pull-off force, the force to separate the bump from the surface, and to obtain the condition for spontaneous separation of the bump. It is demonstrated that the bumps can be used to prevent the stiction of the microstructure such as micro-cantilevers. Moreover the hemispherical bump is more efficient for stiction-prevention than the cylindrical bump when bumps have the same cross-sectional area.

ASSESSMENT OF AN ENGINE CYLINDER HEAD-BLOCK JOINT USING FINITE ELEMENT ANALYSIS

조성산,신춘세,이창수,장훈,이경우 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.1

An engine cylinder head-block joint is a gasketed, bolted joint. Assessment of sealing performance and fatigue durability of the joint during engine development relies entirely on the engine dynamometer test because the rig test cannot mimic the engine run condition and finite element analysis employs gasket and bolt models that are too simple to provide the stress data for fatigue assessment. This paper introduces finite element-based assessment of the gasket and the bolt and a model that improves the analysis accuracy without increasing computation time. Experimental data for the deformation of joint members under thermo-mehanical load are presented to demonstrate the accuracy of the model.

벼잎線虫에 對한 種子消毒 및 本畓 葉劑防除에 關한 研究

趙成山,韓萬鍾,梁壯錫 한국응용곤충학회 1987 한국응용곤충학회지 Vol.26 No.2

벼잎선충(線蟲)에 대(對)한 종자소독(種子消毒) 효과 및 본답(本畓)에서의 약제방제(藥劑防除) 체계(體系)를 구명(究明)코자 시험(試驗)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 벼잎선충(線蟲)에 대(對)한 종자소독용(種子消毒用) 살충제(殺蟲劑)로 메프유제(乳劑), 다수진유제(乳劑), 펜치온유제(乳劑)의 약효(藥效)가 양호(良好)하였다. 2. 기존(旣存) 종자소독용(種子消毒用) 살균제(殺菌劑)인 베노람수화제(水和劑), 티시엠유제(乳劑), Proaz유제(乳劑)와 살충제(殺蟲劑), 메프유제(乳劑), 펜치온유제(乳劑), 다수진유제(乳劑)를 각각(各各) 혼용(混用)하여 종자소독(種子消毒)을 하였을때에도 약효(藥效)가 우수(優秀)하였으며 약해(藥害)도 없었다. 3. 본답(本畓)에서의 벼잎선충(線蟲)에 대(對)한 방제체계(防除體系)로는 종자소독(種子消毒)+카보입제(粒劑) 토중처리(土中處理)와 종자소독(種子消毒)+카보입제(粒劑) 6월하순(月下旬) 수면처리(水面處理)가 효과적(效果的)이었다. Experiments were caried out to invesstigate the effects of seed disinfectant and the chemical control method in the paddy field for the rice white-tip nematode, Aphelenchoides besseyi. All three seed disinfectants tested, MEP 50% EC, Fenthion 50% EC, Dasuzin 34% EC showed effective control without any symptom of phytotoxicity. Mixed treatments with fungicides, Benoram 40% Wp, proraz-25% EC, TCM 30% EC also showed the effective control and no phytotoxicity. Effective chemical control methods for the rice white-tip nematode in paddy fields was seed disinfectant before seeding and Carbofuran 3% G. on the day before the transplanting, or seed disinfectatnt + Carbofuran 3% G. water surface treatment on the early stage of injury.

18세기 洛論系의 <磻溪隨錄> 인식과 洪啓禧 經世學의 思想的 基盤

조성산 조선시대사학회 2004 朝鮮時代史學報 Vol.30 No.-