유한요소 해석을 이용한 특수선용 신축 이음관 개발

박형욱(Park Hyung-Wook),김정환(Kim Jung-Hwan),조종래(Cho Jong-Rae) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-

PIPE LINE, DUCT, VESSEL are changed the length by the individual thermal expansion and contraction according to temperature increase. And will forward to the high-strength anchor point. The compensator is used to give the space for these changes set. This study was conducted to development the useful environment and the range of the high temperature/high pressure compensator in domestic produced which can apply to special ship. In addition, the compensator which had been applied to the reinforcement carried out the shape optimal design using the structural analysis.

노쇠한 사이보그

박형욱(Park, Hyung Wook) 한국과학기술학회 2013 과학기술학연구 Vol.13 No.1

사이보그와 노화는 현대 과학기술의 두 가지 중요한 화두라 할 수 있다. 이 논문은 일본의 애니메이션 감독 카미야마 켄지(神山健治)의 SF 작품인 〈공각기동대 Stand Alone Complex〉를 통해 이 두 가지 화두가 만나는 지점을 분석해 본다. 실로 연령은 젠더와 인종, 계급과 더불어 현대 사회와 정치를 구성하는 매우 중요한 범주이나 과학기술학자들은 이에 대해 깊게 연구하지 않았다. 특히 다너 해러웨이(Donna Haraway)의 “사이보그 선언문(Cyborg Manifesto)”(1991) 이후 현대 과학기술에 의해 변화하는 젠더의 전망에 대해서는 많은 과학기술학적 연구가 있었으나 연령이 과학기술과 맺는 관련과 그 영향에 대해서는 깊은 연구가 이루어지지 못했다. 만약 해러웨이가 주장한 것처럼 사이보그가 여성에게 지워진 생물학적 담론을 넘어설 수 있는 방법을 보여준다면, 그것은 노인들에게도 자신들의 변화하는 몸의 한계와 연령주의적 담론을 넘어설 수 있는 가능성을 열어줄 수 있을까? 마이크 페더스톤(Mike Featherstone)은 과학기술이 늙어가는 몸과 결합하여 생겨난 사이보그적 상태가 만든 새로운 전망을 긍정적으로 분석하고 있다. 그러나 이 글은 〈공각기동대〉를 통해 노년기의 사이보그화와 관련된 더 복잡한 문제들을 분석한다. 나는 과학기술과 노인의 만남을 통해 태어난 노쇠한 사이보그가 전통적 가족주의와 민족주의를 넘어설 수 있게 하나 연령주의를 극복하지는 못하며, 세계화된 자본주의와 네트워크 속의 통제된 신체를 통한 새로운 개인주의적 삶의 형태를 창조해 내고 있음을 보일 것이다. Based on an analysis of the Japanese animation director Kamiyama Kenji’s Ghost in the Shell: Stand Alone Complex series, this paper discusses two important subjects in modern technoscience?cyborg and old age. In fact, age has been an important social and political category in the modern world, along with gender, race, and class. However, age has not been a significant research topic for STS scholars. Even though many of these investigators have extensively explored the complex relationship between gender and technoscience, especially after the publication of Donna Haraway’s “Cyborg Manifesto” (1991), few of them have been interested in how age is reconfigured by modern science and technology. If women, as Haraway has claimed, can have a different political and cultural outlook by becoming cyborgs, then, can we expect a similar socio-cultural transformation with regard to the interaction between cyborg and old age? Do the elderly experience lesser age discrimination through the growth of biomedicine and technoscience? Indeed, it is believed that seniors are increasingly becoming cyborgs with advancing age, since their declining bodily functions are consistently replaced and assisted by various biomedical technologies. Does this enable them to overcome ageism and age discrimination as well as their alleged physiological and mental limitations? As an answer to this question, Mike Featherstone has asserted that becoming a cyborg in old age could make the wrinkled skin a mere mask and create diverse new possibilities that were hitherto unavailable to an aging person. Based on my reading of Ghost in the Shell, however, I analyze a more complex set of problems when the senile cyborg is created through the encounter between the elderly and technoscience. I argue that while the senile cyborg could challenge traditional family ideology and nationalism it would leave ageism intact and define a new individualistic life form through a body controlled within the globalized internet and capitalist economy.

당뇨병 환자와 정상 혈당 환자에서 폐결핵의 임상적, 방사선학적 차이

박형욱 ( Hyung Wook Park ),도경록 ( Kyong Rock Do ),전은경 ( Eun Kyoung Jeon ),박진영 ( Jin Young Park ),이자영 ( Ja Young Lee ),김지은 ( Ji Eun Kim ),박용근 ( Young Kun Park ),이상록 ( Sang Rok Lee ),안진영 ( Jin Young An ) 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.64 No.4

심혈관 위험을 낮추기 위한 생활습관 관리

박형욱 ( Hyung Wook Park ) 대한내과학회 2014 대한내과학회지 Vol.87 No.2

A healthy lifestyle is important in the prevention and delayed progression of cardiovascular disease (CVD). The intent of this lifestyle management guideline review is to evaluate evidence describing particular dietary patterns, nutrient intake, and levels and types of physical activity associated with CVD risk. The recommendations of this article may be used in management of hypercholesterolemia and hypertension. The proposed guidelines emphasize the importance of dietary patterns rather than individual dietary components. Dietary patterns offer the opportunity to characterize the overall composition and quality of the eating behaviors of a population, such as a Mediterranean-style diet. Dietary sodium and potassium are particularly relevant in CVD due to their effects on blood pressure, while substantial epidemiologic evidence links higher levels of aerobic physical activity to lower rates of CVD and other chronic diseases such as Type 2 diabetes mellitus. This indicates that weight loss and maintenance are critical for prevention and control of CVD risk factors. (Korean J Med 2014;87:131-135)

표준 치아 크기 및 배열 정보를 이용한 다중 치아 임플란트 식립계획 방안

박형욱(Hyung-Wook Park),박상진(Sang-Jin Park),박형준(Hyungjun Park) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1

최근 의료영상 기반 3D 데이터가 임플란트 시술계획 수립에 널리 활용하고 있으나 식립 위치와 방향 선정의 경우 시술자의 경험 및 주관적 판단에 의존되어 시술자 간 상당한 편차가 존재한다. 본 논문에서는 한국인 표준모델을 토대로 얻어진 하악 치아들의 크기 및 배열 정보를 환자에 따른 식립 부위 주변 치아 및 구강 정보와 접목하여 다중 임플란트 식립 위치 및 방향을 결정하고, 이를 바탕으로 임플란트 크기 및 유형을 선정하는 방안을 제안한다. 얻어진 식립정보를 이용하여 식립보조도구(surgical stents)의 3D 모델을 생성할 수 있으며, 치아 임플란트 시술용 교육 컨텐츠로 활용될 수 있고, 식립계획 수립을 위한 유용한 정보로 활용될 수 있다.

FPSO 연료가스 압축 시스템용 부정류 방지 밸브의 유량 평가 프로그램 개발

박형욱(Hyung Wook Park),이승민(Seung Min Lee),조종래(Jong Rae Cho) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.12

In this study, to avoid surging in the system as a way to ensure the proper discharge requires the design of the valve capacity rating objective is to develop a program. Approximation algorithm for the capacity evaluation is suggested. Loss coefficients obtained by the algorithm is calculated put in the governing equation for the valve flow coefficient and capacity. Calculated values were compared with numerical analysis results for the verifying their validity. The proven formula is created using Excel and it can be easily available the valve design engineers. Creation of analysis models were using a version of Unigraphics NX 4.0, numerical analysis were using a flow analysis commercial program ANSYS CFX 12.0 version. Equations were referenced ‘Handbook of Hydraulic Resistance - 3rd Edition’.

3차원 기하 처리와 유한요소 분석을 이용한 치아 임플란트 식립 계획 수립

박형욱(Hyung-Wook Park),박철우(Chul-Woo Park),김명수(Myong-soo Kim),박형준(Hyungjun Park) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.4

In order to make dental implant surgery successful, it is important to perform proper planning for dental implant placement. In this paper, we propose a decent approach to dental implant placement planning based on geometric processing of 3D models of jawbones, a nerve curve and neighboring teeth around a missing tooth. Basically, the minimum enclosing cylinders of the neighboring teeth around the missing tooth are properly used to determine the position and direction of the implant placement. The position is computed according to the radii of the cylinders and the center points of their top faces. The direction is computed by the weighted average of the axes of the cylinders. For a cylinder whose axis passes the position along the direction, its largest radius and longest length are estimated such that it does not interfere with the neighboring teeth and the nerve curve, and they are used to select the size and type of an implant fixture. From the geometric and spatial information of the jawbones, the teeth and the fixture, we can construct the 3D model of a surgical guide stent which is crucial to perform the drilling operation with ease and accuracy. We have shown the validity of the proposed approach by performing the finite element analysis of the influence of implant placement on bone stress distribution. Adopted in 3D simulation of dental implant placement, the approach can be used to provide dental students with good educational contents. It is also expected that, with further work, the approach can be used as a useful tool to plan for dental implant surgery.

네이던 샥, 노화학, 그리고 노화의 생의료화

박형욱 ( Hyung Wook Park ) 한국과학사학회 2013 한국과학사학회지 Vol.35 No.1

Nathan Shock, the leader of the NIH`s gerontology program from 1941 to 1976, played a pivotal role in creating the science of aging as a research field in America. By illustrating his works, I explore how his efforts to biomedicalize aging were linked to the identity and agenda of gerontology as a multidisciplinary scientific field. Indeed, “biomedicalization” is understood in many ways. Whereas it was often equated to molecular reductionism, Peter Keating, Albert Cambrosio, and Adele Clarke have shown that biomedicalization involves a set of more complex changes in laboratories, clinics, and patients` social worlds with a deep cultural repercussion. According to them, patients were not necessarily passive subjects in biomedical enterprises. This paper will depict how this character of biomedicine resonated with Shock and other gerontologists` works for more active and productive old age. I first discuss how Shock tried to find the physiological and biochemical mechanism of aging using model organisms, biomolecules, and senior patients in the Baltimore City Hospitals. Then I illuminate how this work was placed in a broader social context associated with the elderly`s continued social participation, industrial productivity, and health management, which were the critical agendas of early American gerontologists who worked to address these problems through their multidisciplinary organizations. This explains, I claim, his unique choice of publishable results, the initiation of the Baltimore Longitudinal Study of Aging, and his continued effort to communicate with regional gerontology groups comprised mostly of educated laymen interested in science.

식립 보조도구를 이용한 3D 치아 임플란트 시술 시뮬레이션

박형욱(Hyung-Wook Park),김명수(Myong-Soo Kim),박형준(Hyungjun Park) (사)한국CDE학회 2011 한국CDE학회 논문집 Vol.16 No.3

Surgeon dentists usually rely on their experiential judgments from patients’ oral plaster casts and medical images to determine the positional and directional information of implant fixtures and to perform drilling tasks during dental implant surgical operations. This approach, however, may cause some errors and deteriorate the quality of dental implants. Computer-aided methods have been introduced as supportive tools to alleviate the shortcomings of the conventional approach. In this paper, we present an approach of 3D dental implant simulation which can provide the realistic and immersive experience of dental implant information. The dental implant information is primarily composed of several kinds of 3D mesh models obtained as follows. Firstly, we construct 3D mesh models of jawbones, teeth and nerve curves from the patient’s dental images using software Mimics™. Secondly, we construct 3D mesh models of gingival regions from the patient’s oral impression using a reverse engineering technique. Thirdly, we select suitable types of implant fixtures from fixture database and determine the positions and directions of the fixtures by using the 3D mesh models and the dental images with software Simplant™. Fourthly, from the geometric and/or directional information of the jawbones, the gingival regions, the teeth and the fixtures, we construct the 3D models of surgical guide stents which are crucial to perform the drilling operations with ease and accuracy. In the application phase, the dental implant information is combined with the tangible interface device to accomplish 3D dental implant simulation. The user can see and touch the 3D models related with dental implant surgery. Furthermore, the user can experience drilling paths to make holes where fixtures are implanted. A preliminary user study shows that the presented approach can be used to provide dental students with good educational contents. With future work, we expect that it can be utilized for clinical studies of dental implant surgery.

표준 치아 크기 및 배열 정보를 이용한 다중 치아 임플란트 식립계획 방안

박형욱(Hyung-Wook Park),박상진(Sang-Jin Park),박형준(Hyungjun Park) (사)한국CDE학회 2015 한국CDE학회 논문집 Vol.21 No.2

It is important to devise methods for assisting dentists to consistently determine implant positions and directions and to accurately perform drilling tasks during dental implant surgery. In this paper, we propose a novel approach to tooth implant placement planning which deals with the determination of the positions and directions of multiple implant fixtures for a set of missing mandibular teeth and suggests the selection of the sizes and types of the implant fixtures. We combine Korean standard data in the sizes and positions of human teeth with the patient specific 3D models of mandibular jawbones, nerve curves, and neighboring teeth around the missing teeth in order to determine the positions and directions of the implant fixtures for the missing teeth. Using the geometric and spatial information of the jawbones, the teeth and the implant fixtures, we can construct the 3D models of surgical guide stents which are crucial to perform drilling tasks with ease and accuracy. Adopted in 3D simulation of dental implant placement, the approach can provide surgeon students with good educational contents. We also expect that, with further work, the approach can be used as a useful tool to plan for dental implant surgery.