A new family of hybrid 4-DOF parallel mechanisms with two platforms and its application to a footpad device

Yoon, Jungwon,Ryu, Jeha Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of robotic systems Vol.22 No.5

<P>This paper proposes a new family of 4-degrees-of-freedom (DOF) parallel mechanisms with two platforms and its application to a footpad device that can simulate the spatial motions of the human foot. The new mechanism consists of front and rear platforms, and three limbs. Two limbs with 6-DOF serial joints (P-S-P-P) are attached to each platform and are perpendicular to the base plate, while the middle limb is attached to the revolute joint that connects the front and rear platforms. The middle limb is driven by the 2-DOF driving mechanism that is equivalent to active serial prismatic and revolute joints (P<SUB>e</SUB>-R<SUB>e</SUB>), or prismatic and prismatic joints (P<SUB>e</SUB>-P<SUB>e</SUB>) with two base-fixed prismatic actuators. Since the middle limb perpendicular to the base plate has 3-DOF serial joints (P<SUB>e</SUB>-R<SUB>e</SUB>-R or P<SUB>e</SUB>-P<SUB>e</SUB>-R), two new 4-DOF parallel mechanisms with two platforms can generate pitch motion of each platform, and roll and heave motions (1T-3R) or pitch motion of each platform and two translational motions (2T-2R) at both platforms, according to the type of the 2-DOF driving mechanism. Kinematic analyses of the 1T-3R mechanism were performed, including inverse and forward kinematics and velocity analysis. Based on the 1T-3R mechanism, a footpad device was designed to generate foot trajectories for natural walking. © 2005 Wiley Periodicals, Inc.</P>

The Global Knowledge Divide in the Learning Economy

Jungwon Yoon 숭실대학교 사회과학연구소 2012 사회과학논총 Vol.14 No.-

The emergence of a new global economy driven by the explosion of knowledge and new technologies has led to new divergence trend reproducing already extant geo-political patterns of inequality. In the new economic system where innovation and learning is crucial for competitiveness, developing innovation capacities through knowledge creation and sharing is essential to obtain and sustain dynamic comparative advantage. Accordingly, the presence or absence of this capacity constitutes knowledge gaps between and within countries. While development and the issue of inequality have become closely tied to knowledge and technological production, relatively few studies have addressed knowledge divide related to innovation competence-building. This paper, therefore, provides some insight on how knowledge divide is constructed in the context of the new economy where the touchstone of competitiveness is the ability to learn and innovate. Also, it presents several theoretical approaches and backgrounds for the understanding of the North-South gap in innovation capacities in the angle of “knowledge divide.”

A 6-DOF Gait Rehabilitation Robot With Upper and Lower Limb Connections That Allows Walking Velocity Updates on Various Terrains

Jungwon Yoon,Novandy, B.,Chul-Ho Yoon,Ki-Jong Park IEEE 2010 IEEE/ASME transactions on mechatronics Vol.15 No.2

<P>This paper presents a 6-DOF gait rehabilitation robot that allows patients to update their walking velocity on various terrain types and navigate in virtual environments (VEs) through upper and lower limb connections. This robot is composed of an upper limb device, a sliding device, two footpad devices, and a body support system. The footpad device on the sliding device generates 3-DOF spatial motions on the sagittal plane for each foot. This allows the generation of various terrain types for diverse walking training. The upper limb device allows users to swing their arms naturally through the use of a simple pendulum link with a passive prismatic joint. Synchronized gait patterns for this robot are designed to represent a normal gait with upper and lower limb connections. To permit patients to walk at will, this robot allows walking velocity updates for various terrain types by estimating the interaction torques between the human and the upper limb device, and synchronizing the lower limb device with the upper limb device. In addition, the patient is able to navigate in VEs by generating turning commands with switches located in the handles of the upper limb device. Experimental results using a healthy subject show that the user can update the walking velocity on level ground, slopes, and stairs through upper and lower limb connections. In addition, the user could navigate in the VEs with walking velocity updates and turning input command allowing various rehabilitation training modes. During a pilot clinical test, a hemiplegic patient could use the suggested gait rehabilitation robot with a slow walking speed. The rehabilitation plan was also suggested for the patient and the possible therapeutic effects of the suggested rehabilitation robot system are discussed.</P>

The Bio-politics of Reproduction Technologies in Modern Korea, 1960-1990

Jungwon Yoon 한국학술연구원 2015 Korea Observer Vol.46 No.3

This paper explores the historical landscape of bio-politics shaped in modern Korea. Between the 1960s and the 1990s, conjoined issues within gender, demography, reproductive technologies, culture, and politics unveiled the salient aspect of women’s reproductive lives in the country. The strong national desire for modernization and development after the Korean War became a powerful force, transforming the state into a bio-power agency. Through the implementation of the family planning program, the widespread adoption of modern reproductive technologies empowered women to control their own reproduction and brought out abrupt social and demographic changes in the country. The findings of the study suggest that Korean women were not merely a subject of family planning but active creator in the way of reproducing bio-power as well as the patriarchal culture through modern technologies.

A Novel Locomotion Interface with Two 6-DOF Parallel Manipulators That Allows Human Walking on Various Virtual Terrains

Yoon, Jungwon,Ryu, Jeha Sage Publications 2006 The International journal of robotics research Vol.25 No.7

<P><I>This paper proposes a novel locomotion interface that can generate an infinite floor with various surfaces and can provide a user with proprioceptive feedback about walking. The interface allows users to experience life-like walking in virtual environments with various terrains. The interface consists of two platforms, each consisting of a three-degrees-of-freedom (3-DOF; x, y and yaw) planar device on which a 3-DOF (pitch, roll and z) footpad is mounted. Alternating current servomotors drive the planar devices to generate rapid motions, while pneumatic actuators drive the footpad devices to generate the impedances required for various virtual terrains, in addition to supporting the user’s weight. To simulate natural human walking, the locomotion interface design specifications are based on gait analysis, and each mechanism is optimally designed and manufactured to satisfy these requirements. The locomotion interface allows natural walking (step, 0.8 m; height, 20 cm; load capability, 100 kg; slope, 55°) on various terrains.</I></P><P><I>In addition, a new walking control algorithm is proposed for generating continuous walking on an infinite floor involving various terrains. In this algorithm, each independent platform follows a human foot during the swing phase, while the other platform returns to the home position during the single-limb stance phase. During the double-limb stance phase, the two platforms assume neutral positions to compensate for the offset errors generated by velocity changes. Therefore, this algorithm can satisfy natural walking conditions in any direction. The transition phase between the swing and stance phases is detected using a simple switch sensor system, while human foot motions are sensed using a calibrated magnetic motion tracker attached to the shoe.</I></P><P><I>Actual walking simulations on level ground, slopes, and stairs show that the proposed locomotion interface allows an average person to walk naturally on various virtual terrains in safety, without marked disturbances. This interface has various applications, such as in virtual reality (VR) navigation, rehabilitation, and gait analysis.</I></P>

Intraoperative enhanced imaging for complete enucleation of endometrioma using indigo carmine

( Jungwon Yoon ),( Ii Dong Kim ),( Anna Choi ),( Sung Hong Joo ) 대한산부인과학회 2021 대한산부인과학회 학술대회 Vol.107 No.-

An Investigation on Scholarly Publications using HINTS Data by Bibliometric Analysis

JungWon Yoon,EunKyung Chung,Jae Yun Lee 이화여자대학교 이화사회과학원 2019 사회과학연구논총 Vol.35 No.1

Data sharing and reuse have been one of primary phenomena in a wide variety of disciplines due to the advanced information technologies. In context of data reuse, this study aims to identify the topics, disciplinary characteristics, and temporal progresses of scholarly publications using a dataset HINTS. For the purpose of this study, we analyzed a total of 283 scholarly publications using HINTS by analyzing author’s affiliation, subject categories, and bibliographic coupling. The results demonstrate that communication and public health are two leading disciplines however, due to the focus of cancer information, oncology was another area revealed by the use analysis of HINTS data. More specifically, the topics identified by HINTS research could be grouped into two categories: Cancer information behaviors and general health information behaviors. Several related studies demonstrated that health information is a key topic in health communication, and in this sense, we believe that HINTS datasets are valuable datasets focusing on health information behaviors. The analysis results of HINTS publications showed that among various subtopics of health information, health information channels and sources are main interests of communication scholars, health literacy is of public health scholars, and cancer awareness and risk perceptions are researchers from medicine and public health fields. Also, in major topics, although leaning disciplines were found, it was also notices that authors from each discipline made contributions to major topics, such as Caner perceptions, cancer awareness, health information channels, and demographic characteristics and health information behaviors.

The Technocratic Politics in China

Jungwon Yoon 숭실대학교 사회과학연구소 2011 사회과학논총 Vol.13 No.-

Since the early 1980’s, the post-Mao China has been governed by three generations of technocratic leadership. As a result of massive elite transformation under new leadership of Deng Xiaoping in the 1980s, technocrats emerged at the core leadership of the Chinese Communist Party (CCP). In fact, China has been ruled by men who trained in higher education in science and engineering (S&E) fields during the last two decades. While full-fledged technocratic leadership is firmly established in Chinese politics, three successive generations of the leadership, described as ‘the engineers-turned-politicians,’ have promoted the national economic growth and led to modernization. However, a sudden increase of economists’ entry to the core leadership of the current CCP also indicates the problem and challenge facing China’s technocracy. The change in the composition of the 17th Central Committee may show a new sign of elite transformation in the future Chinese politics, reflecting broad social, economic, environmental, and political issues emerging in China. This would raise implications for the upcoming fifth generation of Chinese leaders.

Health Information Seeking of Foreign-Born Population in U.S.

JungWon Yoon 이화여자대학교 사회과학연구소 2014 사회과학연구논총 Vol.30 No.2

This study aimed to understand features of foreign-born population’s health information seeking behaviors, so that the results can provide evidences which can be utilized in designing health information dissemination. It was found that foreign-born population has less experience on health information seeking than U.S. born and more negative perceptions on health information seeking experiences. Among foreign-born population, it seems that underserved people have less experience of health information seeking, but when they need to find health information they go to doctors or health providers. The Internet is the most dominant source of health information among foreign-born population.

China’s Technological Catching-up in the Knowledge Economy

Jungwon Yoon(윤정원) 숭실대학교 사회과학연구소 2009 사회과학논총 Vol.11 No.-

Although the current level of China’s economy and innovation is still in the catch-up stage, its remarkable progress has become a role model for most of underdeveloped countries. The unprecedented economic growth along with technology progress in China during past two decades has been largely driven by China’s efforts to make improvement in the performances of the national innovation system (NIS). The two decades market-oriented reform of China since 1985 has improved efficiency and performance of its science and technology (S&T) system, transforming it toward a highly dynamic, interactive and efficient one, as those in the advanced countries. In recent years, China’s improvement in S&T activities has been largely driven by a set of market-oriented institutional reforms, strong investment in research and development (R&D), development of human capital in S&T and infrastructures, and effective adoption of foreign knowledge and technologies, especially through foreign direct investment (FDI), and interactions of social institutions. However, China still has a long way to go to build the mature NIS. While China successfully reforms its innovation system, it also faces several challenges for moving toward endogenous system. The challenges now include weak innovative capabilities of the private sector, inadequate intellectual property rights (IPR) protection, a shortage of skilled workers in S&T, regional discrepancy in innovative activities, and weak linkage between innovation actors.