Better Option for Improving Metabolic Syndrome: Consideration of the Amount and Duration of Resistance Exercise or Physical Activity

조현덕,김맹규 한국운동생리학회 2023 운동과학 Vol.32 No.2

PURPOSE: Physical activity (PA) improves the metabolic syndrome (MetS) risk. According to a recent revision of the PA guidelines for Americans (2018), healthy adults should participate in PA for >300 min/week for additional health benefits. In addition, it is recommended to participate in resistance exercise (RE) ≥2 days/week. This study aimed to determine whether increasing the PA duration or adding RE is more efficient in improving MetS. METHODS: Data from the 2016-2018 Korean National Health and Nutrition Examination Survey were used. The logistic regression and general linear models in the complex sample were performed with a sample of 8,662 Korean adults aged 19–65. According to the metabolic equivalent task (MET), PA intensity was categorized as low-(LP; <600 MET-min/week), moderate-(MP; 600-3,000 MET-min/week), and high-level PA (HP;≥3,000 MET-min/week). Furthermore, duration was categorized as high duration (HD) and low duration (LD), while RE was categorized more 2 days/week RE (MR) and less 2 days/week RE (LR). RESULTS: Compared with LP-LR the MR groups showed a significantly low odds ratio (OR) of MetS (p<.05 respectively), whereas the LR groups had no significant OR (p>.05 respectively). Compared with LP-LD, HP-HD had significantly low OR (p<.05), whereas other groups had no significant OR (p>.05 respectively). CONCLUSIONS: Frequent RE decreases the OR of MetS and is not dependent on PA intensity. To efficiently reduce the OR of MetS in Korean adults, participating in frequent RE, rather than simply prolonging PA, is recommended; although, increasing PA duration can have positive effect in HP. In terms of the reduction of the MetS, more than 300 min/week of PA is unlikely to achieve additional health benefits

5-축 CNC 밀링으로의 자유곡면 가공에 관한 연구 (II) 커섭 높이 예측과 공구경로 결정

조현덕,전용태,양민양 대한기계학회 1993 대한기계학회논문집 Vol.17 No.8

For the machining of the sculptured surfaces on 5-axis CNC milling machine, the milling cutter direction vector was determined in the study (I) with 5-axis post-processing. Thus, it was possible to cut the sculptured surfaces on five-axis CNC milling machine with the end mill cutter. Then, for smooth machined surfaces in five-axis machining of free-from surfaces, this study develops an algorithm for prediction of cusp heights. Also, it generates tool path such that the cusp heights are constrained to a constant value or under a certain value. For prediction of the cusp height between two basis points, a common plane, containing the line crossing two basis points and the summation vector of two normal vectors at two basis points, is defined. The cusp height is the maximum value of scallops on the common plane after end mill cutter passes through the common plane. Sculptured surfaces were machined with CINCINNATI MILACRON 5-axis machining center, model 20V-80, using end mill cutter. Cusp heights were verified by 3-dimensional measuring machine with laser scanner, WEGU Messtechnik GmbH.

웨이블릿 변환 영역에서의 적응적 모드 선택 기법을 이용한 3차원 의료 영상을 위한 interframe 부호화

조현덕,나종범 대한의용생체공학회 1999 의공학회지 Vol.20 No.3

본 논문에서는 3차원 의료 영상에 적합한 interframe 부호화 알고리즘을 제안하였다. 제안된 알고리즘은 움직임 추정/보상과 변환 부호화를 사용하는 동영상 압축 방법에 기초를 두고 있다. 이 알고리즘에서는 움직임 추정을 위해 와핑 방법이 채택되었다. 그리고, 부호화 효율을 향상시키기 위해 적응적 모드 선택을 사용하여 웨이블릿 변환 영역에서 움직임 조상된 오차 영상과 원 영상을 혼합한다. 이렇게 혼합된 영상은 제로트리 부호화 기법에 의해 압축된다. 본 논문은 제안된 방법이 3차원 의료 영상의 부호화에 매우 유용함을 증명하였다. 모의실험결과는 제안된 방법이 슬라이스 간의 간격과 무관하게 항상 좋은 결과를 얻을 수 있도록 하고, 그럼으로써 3차원 의료 영상 압축에 매우 바람직하다는 사실을 보여준다. In this paper, we propose a novel interframe coding algorithm especially appropriate for 3-D medical images. The proposed algorithm is based on a video coding algorithm using motion estimation/ compensation and transform coding. In the algorithm, warping is adopted lor motion compensation (MC). Then, by using adaptive mode selection, a motion compensated residual image and original image are mixed up in the wavelet transform domain for improvement in coding performance. The mixed image is then compressed by the zerotree coding method. We prove that the adaptive mode selection technique in the wavelet transform domain is very useful lor 3-D medical image coding. Simulation results show that the proposed scheme provides good performance regardless of inter-slice distance and is prospective for 3-D medical image compression.

4륜 구동 및 4방식 조향장치를 적용한 로더 개발

조현덕,Cho, Huyn-Deog 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3

The loader of this study is an agriculture machine for a stock farmer. We has much researched about power train and steering system in order to develop a new stock machine. So, the loader developed in this study has a 4 wheel driving system and a 4-type wheel steering system. Though the technological region is some large and general, these technologies are very important and their technical life may be very long. The power train of the loader is consisted of many units as follows, engine, clutch, transmission, and axles. And, the 4-type wheel steering system is consisted of oil tank, oil pump, steering valve, solenold valve, electronic controller, hydraulic cylinders, and touch sensors. This study shows construction logics of power train and steering system. We could know from many working tests that the developed loader with 4-type steeling system has many advantages when driving in a narrow corral.

Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 I (모델링에 관한 연구)

조현덕,정대일,윤문철,최두선,신보성,이응숙,Yu-Ge Dong 한국생산제조학회 2001 한국공작기계학회논문집 Vol.10 No.6

We have developed the exclusive CAD/CAM system for the machining of impeller blades. This study is about the mod-eling method for the effective machining of impeller blades farmed by ruled surface. As the impeller is consisted of boss part and blade part, the boss is modeled by rotational surface of hub curve on z-axis and the blade is described by ruled- surfaces between hub curve and shroud curve. This modeling process can be carried out on the software developed in this study. And, the developed software can describe the impeller as a solid model through interface with Solid-Works soul- ware. The developed software containing the interface method proposed in this study was very effective fur impeller modeling.

출혈성 쇼크로 유도된 흰쥐의 위병변에 대한 Allopurinol의 보호 효과에 관한 연구

조현덕 중앙대학교 의과대학 1990 내과학교실 Vol.1990 No.22

볼 감속기 설계 및 가공을 위한 CAD응용에 관한 연구

조현덕,Cho, Hyun-Deog 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.2

The most of reducers consist of many gear parts, but a ball reducer never contains a gear. As the ball reducer with gearless has no back lash, it is necessary more and more to precision machine. The reducing of ball reducer happens by cycloid curves and all instant relative velocity centers always pass on a given constant position when rotational running. Then, it is difficult to calculate cycloid curve for design and machining. So, this paper studied a software for the design of the ball reducer design and machined all parts included among cycloid curve. By using the developed software, this study has large benefit to design every ball reducer.

마스트 캠에 의한 컨쥬게이트 캠의 설계 및 가공에 관한 연구

조현덕,Cho, Hyun Deog 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.2

Cam mechanism is a machine part frequently used in machinery. Specially, conjugate cam mechanism is very suitable for the high speed working and the heavy power translation. Then a conjugate cam mechanism need high precision for the relations between cam profiles and follower rollers. So, its design and manufacturing are very difficult. Thus, this study is a branch of exclusive CAM systems for design and NC machining of conjugate earn mechanism based on a master plate earn profile in order to exchange an old plate cam mechanism to a new conjugate earn mechanism. For the design of the other cam profile by using a master cam profile, some calculation processes were used by vector summation methods, from master cam profile data to the center data of master follower, from the center data of master follower to the center data of the other follower considered in link mechanism, and offsetting in the center direction of base circle of the other cam from the center data of the other follower. Finally, a sample conjugate cam was selected and machined m order to prove the contents of this study.

볼 엔드밀 가공에서의 공구 처짐 예측과 정밀 가공에 관한 연구

조현덕,양민양 대한기계학회 1992 대한기계학회논문집 Vol.16 No.9

본 연구에서는 볼 엔드밀 가공에서 공구계의 처짐을 고려한 절삭력과 처짐을 예측하고, 처짐의 예측으로 가공 정밀도를 향상시키는 이송 속도와 헬릭스 각의 선정 에 대해서 고찰한다. This paper deals with the prediction of cutting force and tool deflection and it's application in the flexible ball end milling process. Machining accuracy is determined by the static stiffness of tool system and the instantaneous cutting force. The static stiffness of tool system consists of the stiffness of holer and the stiffness of ball end mill. The stiffness of holder was obtained from the experimental result, and the stiffness of ball end mill with two flutes was theoretically analyzed by the finite elements method. In cutting process, the instantaneous cutting force is dependent upon the instantaneous feed and pick feed(radial depth of cut) which are varied by tool deflection. For the calculation of cutting force and deflection of ball end mill, iteration method is used with the linear interpolation to the data of cutting force obtained from rigid ball end mill and the data of tool deflection. In this paper, a for enhancing accuracy is discussed. And the selection of helix angle for minimizing machining error is also discussed.

자기주식의 법적 지위

조현덕,박병권 서울대학교 금융법센터 2018 BFL Vol.87 No.-