Caster with non-sinusoidal profile for use in mold oscillator

박용희,Hyun Chul Park 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.6

The prototype of mold oscillator that uses a non-sinusoidal generator was modified using Inverse dynamics and Multi-body dynamics. We maintained a basic structure of the mold oscillator including the motor, the gear, the leaf-spring and the caster. To reduce the coupling effect, the non-sinusoidal generator was replaced by a hollow cylinder that had non-sinusoidal surface. The system parameters were obtained from previous research [1], and a new design of the connecting rod between the cylinder and the leaf spring was analyzed by sensitivity analysis. A definition of the detailed system component including gear mesh, and non-sinusoidal surface, Lagrange's equation, Fourier series, and Cam profile synthesis was used to define an equation of motion. The response of oscillating system was derived by a direct integration method. The model was simulated according a specific assumption for each component, and a control system corresponding to real operation was applied. Dynamic responses are displacement, velocity, and acceleration of each component. All responses from these simulations were analyzed in the time-frequency region by Fast Fourier transform. Using the model, sensitivity analysis about design variables was also executed about operating performance.

측두하악장애 환자에서 악관절 세정술과 교합안정장치를 동반한 치료의 효과

박용희,이상화,윤현중,Park, Yong-Hee,Lee, Sang-Hwa,Yoon, Hyun-Joong 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.1

The purpose of this study was to evaluate the clinical outcomes of patients with temporomandibular joint disorder before and after performance of arthrocentesis and stabilization splint therapy. The subjects of this study were 33 patients with limited mouth opening or pain or joint effusion who visited the Department of Oral and Maxillofacial Surgery, St Mary's Hospital, Catholic University of Korea. The arthrocentesis was performed and the stabilization splint was worn immediately after the arthrocentesis. Comparing the clinical outcomes of treatment at the times of first medical examination, 3 months and 6 months later on treatment. The results are as follows; 1. Statistically significant increase in the amount of maximum mouth opening occurred 3 months and 6 months later on treatment. 2. Statistically significant decrease in the average value of pain on test measured by VAS during maximum mouth opening, protrusive movement, right lateral movement, left lateral movement occured 3 months and 6 months later on treatment. The results suggested that arthrocentesis and stabilization splint therapy provide a improvement on patients with temporomandibular joint disorder when the exact diagnosis were provided.

디젤입자상물질 여과장치의 배기저감성능 효과 분석

박용희,신대윤,Park, Yong-Hee,Shin, Dae-Yewn 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.1

Diesel PM can be controlled using Diesel Particulate Filter, which can effectively reduce the level of soot emissions to ambient background levels. In the Heavy Duty Diesel area, the Continuously Regeneration trap has been widely applied in the retrofit market. As the Special act for the improvement of air quality in the capital area, the retrofit program for DPF to used diesel vehicle has progressed favorably and there are currently over 1,000 of these DPF in use in retrofit applications in korea. These DPF comprise a specially formulated Diesel Oxidation Catalyst upstream of a DPF. The $NO_2$ generated by the DOC is used to combust the carbon collected in the DPF at low temperature. To certificate DPF device that is suitable to domestic circumstances, it is necessary to evaluate exactly the DPF devices according to the regulation of DPF certificate test procedure for retrofit(ministry of environment(MOE) announcement NO. 2005-16). To do so the understand of that regulation like the standard of PM reduction rate is needed. In this study the test procedure including test cycle and BPT test condition was examined and also the test result for specific DPF was analyzed. In every test like field test, PM reduction efficiency test and seoul-10 mode test, no defect could be showed.

상악동을 침범한 함치성 낭종의 내시경을 이용한 치험례

박용희,윤현중,김성원,이상화,Park, Yong-Hee,Yoon, Hyun-Joong,Kim, Sung-Won,Lee, Sang-Hwa 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.3

Dentigerous cysts are the most common type of developmental odontogenic cysts. They form as a result of a separation of the follicle from around the crown of an unerupted tooth. Usually this lesion can be asymptomatic. Such cysts are often discovered accidently on inspection of x-rays. In other advanced cases, cortical bone expansion, displacement of teeth, secondary infection can be observed. The treatment of dentigerous cyst is enucleation. And according to size, location of lesion and environmental structure marsupialization can be considered. However, Marsupialization takes long treatment time and, cystic tissues are remained so secondary surgery may be needed for total removal., Risks of oroantral fistula, damage on maxillary sinus wall and infraorbital nerve can be considered as complications of conventional surgical treatment of cysts located in maxillary sinus. We treated third molar origin dentogerous cyst located in maxillary sinus removing endoscopically both the tooth and an associated dentigerous cyst. We report our clinical experience with literature review.

IHACRES 모형을 이용한 평창강 유역 내 관측 유량자료의 평가

박용희,유철상,Park,Yong-Hee,Yoo,Chul-Sang 한국방재학회 2008 한국방재학회논문집 Vol.8 No.4

본 연구에서는 IHACRES 모형을 이용하여 충주댐 유역 내 12개 지점에 대한 관측유량자료에 대한 평가를 수행하였다. 특히, IHACRES 모형의 매개변수 중 지형특성 관련 매개변수를 지역화 기법을 이용하여 정량화하고, 이를 대상유역인 충주댐 유역의 여러 수위 관측지점에 적용하는 과정을 함께 수행하였다. 본 연구의 결과를 정리하면 다음과 같다. (1) IHACRES 모형의 매개변수 중 기후특성을 반영하는 매개변수인 c, <TEX>$\tau_w{^0}$</TEX>, f는 유역 전체에 동일하게 결정하여 사용할 수 있음을 확인하였다. (2) IHACRES 모형의 지형특성 매개변수인 <TEX>$t_q,\;t_s,\;v_s$</TEX>는 지형특성인자인 유역면적, 유로연장, 하천경사, 유역경사와의 회귀분석을 통한 지역화를 통해 적절히 추정할 수 있음을 확인하였다. (3) 유역에 대해 일관되게 적용된 기후특성 매개변수와 지역화 과정을 통해 추정된 지형특성 매개변수를 이용하여 충주댐 유역 내 12개 수위관측지점에 대한 관측유량을 평가하였다. 그 결과 상안미, 영월 1 지점의 유량 자료가 상대적으로 정도가 높은 것으로 확인되었고, 영월, 백옥포, 판운 지점의 경우는 유출자료의 품질이 상대적으로 낮은 것으로 파악되었다. 전체적으로 보면 고려된 12개 지점의 관측품질에 많은 차이가 확인되며, 따라서 보다 일관된 관측품질의 확보를 위한 방안의 마련이 시급함을 판단할 수 있었다. This study evaluated the runoff data collected at 12 stream gauge stations of the Chungjoo dam basin using the IHACRES model. Especially, the geomorphology-related parameters of the IHACRES model could be quantified base on the regionalization technique, which have also been applied many stream gauge stations of the Chungjoo dam basin. Summarizing the results is as follows. (1) The climate-related parameters of the IHACRES model c, <TEX>$\tau_w{^0}$</TEX>, and f are found to be estimated and used uniformly over the basin. (2) The geomorphology-related parameters of the IHACRES model <TEX>$t_q,\;t_s,\;and\;v_s$</TEX> are found to be estimated by considering the geomorphological parameters like the basin area, channel length, channel slope, basin slope through the regionalization based on the regression analysis. (3) Using the climate-related parameters applied uniformly over the basin and the geomorphology-related parameters estimated based on the regionalization procedure for each stream gauge station, a total of 12 stream gauge stations have been evaluated with their stream flow measurements. As results, the Sanganmi and Youngwal 1 stream gauge stations have been found to make high quality flow data, but Youngwal, Baekokpo, and Panwoon stations low quality flow data. On the whole, 12 stream gauge stations considered show large differences with their data quality, so a plan for securing more consistent data quality should be prepared imminently.

자동주차가 가능한 무인 주차 시스템

김태선(Tae-Sun Kim),박용희(Yong-heui Park),박준형(Jun-Hyung Park),임혜진(Hye-Jin Im),심인보(In-Bo Shim),황현우(Hyun-Woo Hwang) 한국컴퓨터정보학회 2019 한국컴퓨터정보학회 학술발표논문집 Vol.27 No.2

새로운 부분공진형 제어정류기의 해석

박용희(Yong Hi Park),강욱중(Wook Jung Kang),강창수(Chang Su Kang),이현우(Hyun Woo Lee),심광열 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.12

자율주행차량의 통신 과금 최소화를 위한 경로 계획 시스템

박용희(Yong Hee Park),최원석(Won Seok Choi),이래엽(Lae Yeop Lee),최성곤(Seong Gon Choi) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

차량과 인프라가 통신하는 V2I 기술에 대해 많은 연구가 진행되고 있다. 대표적으로 LTE 는 광범위한 지역에 대해 통신을 지원할 수 있다. 하지만 LTE 는 전화망을 사용하여 서비스된 데이터만큼의 요금을 부과하여야 한다. 다른 예로 Road Side Unit (RSU)를 활용한 Dedicated Short-Range Communication (DSRC)는 요금을 부과하지 않는 대신 LTE대비 통신 인프라가 광범위하게 구축되지 않는다. 따라서 LTE 와 RSU 를 복합적으로 사용하여 통신 서비스를 지원하는 연구가 진행중이다. 본 논문에서는 LTE 사용을 최소화하여 통신 요금을 줄이는 경로 계획 시스템을 제안한다.

왜 `지구적 지성사`가 요구되는가? -지구사적 지성사 기획. 방향과 지향의 문제를 중심으로-

박용희 ( Yong-hee Park ) 대구사학회 2017 대구사학 Vol.127 No.-

이 글은 최근 `지구적 지성사(global intellectual history)`란 이름으로 등장하는 지구적 차원의 지성사 연구경향에 주목하고자 한다. 이는 전(全)지구적 차원에서 이루어진 이념과 사상, 지식과 지성의 이동과 그 과정에서 나타난 상호작용과 관계의 문제를 다룬다는 점에서 흥미롭다. 그러나 이런 시도는 세계화의 시대를 맞아 요구되는 또 하나의 역사서술 경향이란 차원을 넘어 역사서술의 유럽중심주의 극복을 지향하고 있다는 점에서 의미를 갖는다고 할 수 있다. 물론 이름조차 낯선 이 분야는 아직 시작단계이며, 많은 이들의 관심의 대상이 되고 있다고 말하기는 어려운 상황이다. 또 대부분 지구사 분야가 그렇듯이 일국사, 민족사에 주력해 오던 기존 연구자들에게는 새로운 시도가 쉽지 않은 도전의 영역이란 점 역시 부인할 수 없다. 그러나 이 글은 새로운 연구가 가지는 의미를 명확히 함으로써 향후 연구의 가능성을 타진하고자 한다. 사실 `지구적 지성사`란 이름 아래 다양한 시기에 나타난 지구적 차원의 지적 관계에 대해 연구가 가능할 것이다. 그러나 그것이 그동안 사상사의 영역에서 전제되어 온 유럽중심주의의 극복을 염두에 둔다면 특별히 집중되어야 할 연구영역이 존재한다는 점은 명백하다. 무엇보다 근대 이후의 서구와 비서구의 지적 상관관계에 대한 비판적 연구가 집중적으로 수행될 필요가 있다. 왜냐하면 유럽중심주의 극복을 염두에 둔 지성사 연구라면 근대기에 걸쳐 유럽이 전 세계적으로 행사한 지적 헤게모니를 해체하는 일에 우선순위를 부여하는 것이 당연할 것이기 때문이다. 그리고 그와 같은 연구가 전지구적 차원을 염두에 둔 정치적 기획의 가능성을 가진다는 점을 염두에 두고 여러 방식의 구체적 연구를 추진할 수 있을 것이다. 이 글에서는 1) 비서구 지성과 지식이 단순히 서구적 지식의 전파과정의 산물이 아니라 원래 역사적으로 `다름`의 형태를 가지는 것이었으며, 2) 서구적 보편담론으로 환원될 수 없는 `차이`를 전제로 한다는 점을 드러내는 작업이 의미를 갖는다는 점을 밝히고자 한다. 아울러 3) 단순히 서구담론에 대한 비판을 넘어 대항담론을 적극적으로 모색하는 차원에서 이루어질 수 있는 연구의 가능성 역시 타진되어야 할 것이다. In recent years, Global History has firmly established itself as a new and highly productive field of historical research. In the field of Intellectual History also, historians seek to internationalize and globalize their perspectives on the past. Their work increasingly transcends the history of particular nation-states and instead investigates transnational and other long-distance intellectual connections throughout human history. In this paper we will try to summarize this recent trend of research and catch its meaning in Intellectual History. It is nowadays implausible to deny that all efforts to gain new visions of global intellectual connections aim to betray the Eurocentrism in the historical understanding which proposes that the European intellectual development took the lead in the history of humanity. So, the call for an alternative to Eurocentrism gains more attraction. But it is still difficult to question the viewpoint that regards European dominated world history especially in modern times as historical facts. In the field of intellectual history, it is taken for granted that modern global intellectual heritages originated in Europe. So, until today the belief of its spread to the non-European world is taken for granted in the global intellectual development. But many researchers nowadays insist on the necessity for an alternative research in order to provide a more solid basis for a non-Eurocentric interpretation of Global Intellectual History. Accordingly, some approaches are worthy of note in going beyond the Eurocentrism. This paper presents some tentative suggestions in order to overcome this Eurocentric concepts and seek new possibilities in historical research. This paper suggests, first of all, to deny the hegemonic position which the European intellectual heritages have occupied up to the present in the historical interpretation of human intellectual development. Raising a question about the universal meaning of the European intellectual heritages, this paper suggests to shed light on the impact of `non-European knowledge` on the (re-definition) of Global Intellectual History. In addition to this, history of interaction and cultural transfers is considered as an alternative field of research for non-Eurocentric Intellectual History. Concentrating on connected histories or a history of connections, researches from now on can contribute to overcome the Eurocentric Intellectual History. As a result, the western intellectual heritages can be examined as embedded in global spaces of communication and interaction rather than as principally endogenous and autonomous processes. (Dongguk University/pyh@dongguk.ac.kr)

논문(論文) : 민족주의 연구를 둘러싼 새로운 시각

박용희 ( Yong Hee Park ) 대구사학회 2014 대구사학 Vol.117 No.-

Most recently a flurry of theoretical activity has made the nation and nationalism one of the most debated topics of contemporary theory. After a short overview of some key theories of nationalism this paper tried to illustrate two latest attempts at retheorising nationalism. For a long time, the nation was seen as something natural and objective. Most of theorists saw nationalism on the assumption that the world was inevitably and fatally divided into nations and national self-realization was a legitimate and positive goal of political struggles. But the more recent trends to which many theorist draw attention move from this primordialist, essentialist notion of the nation to the currently dominant view of the nation as constructed or invented one. With these in mind, some approaches are worthy of note in going beyond this naive nativist understanding of nation. Presently, a new understanding rises that the discourse and rhetoric of nationhood play a decisive role in the establishment of national identity, and it is important to regard national discourse as an analytical framework that can be used in the study of nationalism. Nationalism is in this sense a discourse that constantly shapes our consciousness and the way we constitute the meaning of the world. It determines our collective identity by producing and reproducing us as ``nationals``. It is a form of seeing and interpreting that conditions our daily speech, behaviors and attitudes. This new approach may enable consciously to avoid nativist understanding of nation in favour of an awareness of the formation of national discourse in modern societies. Moreover, it offers the formation of many different discourses which played an important role in modern societies. National discourse is one, but by no means the only one, of the forces that has shaped and continues to shape the modern world, and its development, like other discourses - regional, transnational etc. -, has to be seen in its complex context. In addition to this, the discourses of post-colonialism and subaltern studies allowed us recently to reflect nationalism non-european societies in a new way. The number and diversity of the studies of nationalism increased in the latest decades under the impact of the experience of decolonization and the ``proliferation`` of new states in Asia and Africa. But it is no doubt that the researches depended on the western theories of nationalism. But an indian researcher once asked, if nationalists have to choose their "imagined communities" from European models, as Benedict Anderson maintains, what do they have left to imagine? Is the postcolonial world only the consumer of modernity? He answers that postcolonial nationalism, in fact, has been based, not on an identity with the "modular" forms that Anderson proposes but on a difference with the modern West. With these in mind, many researchers nowadays insist on the necessity for further investigation on national discourses non-european societies in order to provide a more solid basis for a non-eurocentric interpretation of nationalism. As a result, the Eurocentric character of the ``classical`` debate on nationalism has been nowadays transcended by studies which have drawn our attention to such issues as the experience of nationalism in postcolonial societies and the specific contributions of the people on the national margins, that is the ``hybrids``, to the construction of national identities and the like. In addition to this is under discussion the complex dialectic between Europe and its Others in the construction of nations. Especially it is now no doubt, that "colonial experience and its knowledge" in the non-european societies had a crucial bearing on the structure of national discours inside Europe. The recent trends of postcolonial studies open fruitful fields of inquiry in this regard. (Dongguk University/pyh@dongguk.ac.kr)