초소형 가공 기 구조물 사이즈 최적 설계에 관한 연구

박형욱(Park Hyung Wook),Steven Y. Liang,박종권(Park Jong-Kweon) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5

In this study, a systematic design scheme was developed to reduce a subjective design of micro/mesoscale machine tools. Based on this developed method, the optimization of the size of micro/mesoscale machine tools was performed. These computations include individual mathematical modeling of key parameters such as volumetric error, machine working space, and static, thermal, and dynamic stiffness. In case of dynamic stiffness, it was supplemented with a hammer impact test to identify the dynamic characteristics of the joints.

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.

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.

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.

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)

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.

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

식립 보조도구를 이용한 3D 치아 임플란트 시술 시뮬레이션

박형욱(Hyung-Wook Park),김명수(Myong-Soo Kim),박형준(Hyungjun Park) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2

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 MimicsTM. 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 SimplantTM. 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.

다분야통합최적설계를 위한 적응분해기법

박형욱(Hyung-Wook Park),최동훈(Dong-Hoon Choi),안병호(Byung-Ho Ahn) 한국항공우주학회 2003 韓國航空宇宙學會誌 Vol.31 No.5