Biosensing of miRNA-106a in gastric cancer based on plasmon coupling induced by hybridized metal nanoparticles

Sang Heon,PARK, Jihye LEE,Jeongun CHOE,Jong-Souk YEO 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

An Adaptive Network Mobility Support Protocol in Hierarchical Mobile IPv6 Networks

Sangheon Pack,Taekyoung Kwon,Yanghee Choi,Eun Kyoung Paik IEEE 2009 IEEE Transactions on Vehicular Technology VT Vol.58 No.7

<P>The network mobility (NEMO) basic support protocol provides collective mobility for a group of nodes in vehicular area networks. Since the NEMO basic support protocol always performs the same operations, regardless of a mobile network's characteristics, it cannot achieve optimal performance. We propose an adaptive NEMO support protocol based on hierarchical mobile IPv6. The proposed protocol jointly optimizes binding update (BU) traffic and tunneling overhead by employing the adaptive BU strategy, depending on the session-to-mobility ratio (SMR). Specifically, both the mobile router (MR) and the visiting mobile nodes (VMNs) configure two care-of-addresses: 1) on-link care-of-address (LCoA) and 2) regional care-of-address (RCoA). If the SMR is lower than a predefined threshold, the MR and VMNs perform RCoA and LCoA BU procedures to their home agents (HAs), respectively. Otherwise, LCoA and RCoA BU procedures are conducted by the MR and VMNs, respectively. Via analytical models, we evaluate the performance of the adaptive NEMO support protocol against other NEMO support protocols and derive the optimal SMR threshold. Numerical results demonstrate that the adaptive NEMO support protocol is a valuable solution for promising NEMO applications.</P>

The Effect of Types of Initial Drive-in Steps on Technical Factors in Basketball

( Sangheon Park ),( Sukhoon Yoon ) 한국운동역학회 2018 한국운동역학회지 Vol.28 No.3

Objective: The purpose of this study was to investigate the effect of types of drive-in initial steps in basketball on technical factors, to provide basic information for the enhancement of basketball skill. Method: Ten men (age: 24.70±2.26 years; height: 181.00±5.72 cm; weight: 75.70±8.23 kg; career length: 10.00±3.59 years), each with a career length of over five years and no history of injury to the lower extremities within the prior six months, participated in this study. They were asked to perform four types of drive-in movements at 35~60°, wearing their own shoes, after running from a start line 5 m away and catching a basketball passed by an expert passer. The drive-in movements were measured by eight infrared cameras (Oqus 300, Qualisys, Sweden). Collected raw data were used to calculate total initial step time, displacement, velocity, center of mass (COM) height, and COM velocity. Results: Total initial step displacement and velocity of cross drive-ins (JC, SC) were greater than that of direct drive-ins (JD, SD; p < .05). COM velocity of cross drive-ins (JC, SC) was also greater than that of direct drive-ins (JD, SD; p < .05). Conclusion: Our results indicated that cross drive-ins, regardless of stop step type, are more effective than direct drive-ins. This is because cross drive-ins are technically bold due to less influence from walking violations and double dribble rules in basketball. However, using one-sided movement is too difficult to play in competitive game; therefore, basketball players should develop the ability to choose appropriate movement frequency.

Optimal Binding-Management-Key Refresh Interval in Mobile IPv6 Networks

Sangheon Pack,Wonjun Lee IEEE 2009 IEEE Transactions on Vehicular Technology VT Vol.58 No.7

<P>Mobile IPv6 requires periodic return routability (RR) procedures to avoid different types of security attacks. In this paper, we analyze the optimal binding-management-key refresh interval in mobile IPv6 networks. We first derive the expected binding-management-key exposal time in the RR procedure. After that, the optimal binding-management-key refresh interval, which minimizes additional signaling traffic while bounding the number of infected packets, is obtained. Through analytical and simulation studies, the impacts of the mobility rate, packet arrival rate, and security level on the infected packets are demonstrated.</P>

Analysis of SIP Transfer Delay in Multi-Rate Wireless Networks

Sangheon Pack,Gwangwoo Park,Kiwon Lee,Wonjun Lee IEEE 2010 IEEE communications letters Vol.14 No.10

<P>In this letter, we analyze the SIP transfer delay over multi-rate wireless networks where different transmission modes based on adaptive modulation code are supported. We consider a Nakagami m fading channel at the physical layer and automatic repeat request at the data link layer. Extensive simulation results are given to validate the analytical results and to demonstrate the effects of message sizes and channel conditions.</P>

농구 패스 리시브 시 숙련자와 비숙련자 간의 동작의 부드러움과 손가락 및 상지 협응의 차이

( Sangheon Park ),( Hee Sung Lim ),( Sukhoon Yoon ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.2

Objective: The purpose of this study was to investigate the differences of smoothness and coordination of the fingers and upper extremities between skilled and non-skilled players during receiving the basketball. Method: Ten male recreational basketball players (age: 23.2±2.7 yrs., career: 8.6±1.6 yrs., height: 177.3±6.0, weight: 72.9±8.5 kg) careering over five years and ten non-skilled males (age: 27.3± 1.5 yrs., height: 173.7±5.6, weight: 73.2±12.6 kg) were participated in this study. Then, participants were asked to perform basketball receiving movement for ten times. The receiving movements were recorded by eight infrared cameras (Oqus 300, Qualisys, Sweden). The collected rad data were calculated to duration of basketball receiving, Jerk-Cost, CRP and CRP variability. Results: The CRP of MCP-Wr, Wr-El in skilled group were greater than non-skilled group (p<.05). The CRP variability of El-Sh in non-skilled group was greater than skilled group (p<.05). Conclusion: These results suggest that skilled players perform more effective movement for impact absorption from the basketball. Moreover, the skilled players have consistent movement patterns during basketball performance. Lastly, it is important to train finger sensation and cognitive ability of thrown basketball from the passer.

Performance Analysis of Multicast and Broadcast Services in Mobile WiMAX Systems

Sangheon Pack,Seongyeol Yang,Wonjung Kim,Wonjun Lee IEEE 2011 IEEE communications letters Vol.15 No.11

<P>In this letter, we investigate the performance of multicast and broadcast services (MBS) in mobile WiMAX systems. We develop an analytical model for the session blocking probability and the session disruption probability. Numerical results demonstrate that the session blocking probability and disruption probability are significantly affected by the session arrival rate and session popularity.</P>

모래주머니를 이용한 팔목과 몸통의 무게 증가가 만성 뇌졸중 환자들의 보행에 미치는 영향

( Sangheon Park ),( Hee Sung Lim ),( Sukhoon Yoon ) 한국운동역학회 2021 한국운동역학회지 Vol.31 No.1

Objective: This study aimed to determine the effect of wrist and trunk weight loading using sandbags in stroke patients in order to provide the quantitative data for enhancement of gait movement. Method: Twelve stroke patients, who have been diagnosed with hemiplegia over a year ago, were participated in this study. All subjects were asked to perform normal walking [N], wrist sandbag walking [W], wrist & trunk sandbag walking [WT], and both wrist sandbag walking [B] and both wrist & trunk sandbag walking [BT], respectively. Eight infrared cameras were used to collect the raw data. Gait parameters, arm swing, shoulder-pelvic kinematics, and lower extremity joint angle were calculated to examine the differences during walking. Results: As a result, there were no significant differences in the gait parameters, shoulder-pelvis, and lower extremities joint angles, but significant differences were found in the range of motion and the anteversion in arm swing. Conclusion: Wrist and trunk weight loading using sandbags affected the movement of the upper extremities only while it did not affect the movement of the lower extremities. It implies that it can reduce the risk of falling caused by a sudden movement change in lower extremities. In addition, the wrist and trunk weight loading using sandbags can induce changes in movement of the upper extremities independently and contribute to functional rehabilitation through resistance training.

Adaptive Route Optimization in Hierarchical Mobile IPv6 Networks

Sangheon Pack,Xuemin Shen,Mark, J.W. IEEE Computer Society 2007 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.6 No.8

<P>By introducing a mobility anchor point (MAP), Hierarchical Mobile IPv6 (HMIP6) reduces the signaling overhead and handoff latency associated with Mobile IPv6. However, if a mobile node (MN)'s session activity is high and its mobility is relatively low, HMIPv6 may degrade end-to-end data throughput due to the additional packet tunneling at the MAP. In this paper, we propose an adaptive route optimization (ARO) scheme to improve the throughput performance in HMIPv6 networks. Depending on the measured session-to-mobility ratio (SMR), ARO chooses one of the two different route optimization algorithms adaptively. Specifically, an MN informs a correspondent node (CN) of its on-link care-of address (LCoA) if the CN's SMR is greater than a predefined threshold. If the SMR is equal to or lower than the threshold, the CN is informed with the MN's regional CoA (RCoA). We analyze the performance of ARO in terms of balancing the signaling overhead reduction and the data throughput improvement. We also derive the optimal SMR threshold explicitly to achieve such a balance. Analytical and simulation results demonstrate that ARO is a viable scheme for deployment in HMIPv6 networks.</P>

Mobility Management in Mobile Hotspots with Heterogeneous Multihop Wireless Links

Sangheon Pack,Xuemin Shen,Mark, J.W.,Jianping Pan Institute of Electrical and Electronics Engineers 2007 IEEE communications magazine Vol.45 No.9

<P>In this article we study two representative mobility management schemes for mobile hotspots with heterogeneous multihop wireless links: the NEMO basic support protocol at the network layer and the SIP-based network mobility support protocol at the application layer. We evaluate their salient features and quantify their handoff latency. It is shown that the SIP-based network mobility support protocol can easily be deployed and reduce the tunneling overhead incurred in the NEMO basic support protocol. However, it increases handoff latency due to longer message length. We also discuss several open research issues for seamless mobility support in mobile hotspots.</P>