이재연 교수

Abstract The rising demand for sustainable agriculture necessitates alternative methods to using chemical pesticides for controlling plant pathogens. Biocontrol involves the use of natural antagonists, such as bacteria, as an alternative to synthetic chemical pesticides, which can be harmful to human health and the environment. This review discusses the potential of Bacillus , Streptomyces , Pseudomonas and Serratia as biocontrol agents (BCAs) against various plant pathogens. These bacteria supp

Traditional wearable tactile displays transfer tactile stimulations through a firm contact between the stimulator and the skin. We conjecture that a firm contact may not be always possible and acceptable. Therefore, we explored the concept of a non-contact wearable tactile display using an airflow, which can transfer information without a firm contact. To secure an empirical ground for the design of a wearable airflow display, we conducted a series of psychophysical experiments to estimate the i

Untethered mobile microrobots controlled by an external magnetic gradient field can be employed as advanced biomedical applications inside the human body such as cell therapy, micromanipulation, and noninvasive surgery. Haptic technology and telecommunication, on the other hand, can extend the potentials of untethered microrobot applications. In those applications, users can communicate with the robot operating system remotely to manipulate microrobots with haptic feedback. Haptic sensations art

Several designs for a spherical rolling robot have been suggested and some of them were implemented. The kinematics and dynamics study as well as the path planning for the rolling robot are based on the assumption that the deterministic model describes the actual rolling robot successfully. However, due to the high mobility of the sphere, the stochastic behavior is obviously observed. In this paper, we first build a rolling robot to confirm the stochasticity. The robot is actuated by a mass-shif

In this paper, we propose a new insertion plan for steerable flexible needles with which we can target multiple locations in the plane with a single entry point (i.e. port). The method is developed based on the observation that multiple locations can be reached by a flexible needle through insertion, partial retraction, rotation, and re-insertion of the needle. We show that in 2D space this problem can be solved using a geometric relationship between multiple tangent circles. Specifically we fin

A powerful interaction mechanism is one of the key elements for the success of smart TVs, which demand far more complex interactions than traditional TVs. This paper proposes a novel interface based on the famous touch interaction model but utilizes long-range bare hand tracking to emulate touch actions. To satisfy the essential requirements of high accuracy and immediate response, the proposed hand tracking algorithm adopts a fast colorbased tracker but with modifications to avoid the problems

Needles are widely used in medicine for minimally invasive procedures. A steerable flexible needle was first introduced about 15 years ago, which was a new type of needle and could follow three-dimensional curved trajectory during medical procedures. The flexible needle has the limit of a single and low curvature. In this paper, we overcome this limit by designing mechanisms for tube-wire type flexible needles. We also provide a systematic planning method for an automated operation of the needle

In this paper, we improve the path-of-probability (POP) algorithm to generate better and smoother paths for robotic systems. The POP algorithm generates a full path with the maximum probability to reach a target. Although the POP algorithm has been successfully applied to path generation of robotic systems, it has the limit that the intermediate paths are generated using a finite and small number of candidate paths. This results in non-smooth (or zigzag pattern) paths which are not desirable for

This paper presents a design, a control scheme, and experiments for a new vibrating magnet robot (ViMbot). Permanent magnets in the new robot vibrate due to an external vibrating magnetic field. The vibration motion of the robot induces the locomotion of the robot. The vibratory dynamic response of the ViMbot is heavily dependent on the frequency of the vibration. This paper shows that the direction of the robot locomotion can be controlled by the vibration frequency of the external magnetic fie

In this paper we design a robot that can move forward and backward based on the vibration excitation. The proposed design enables the robot to locomote on the horizontal surface using the vibration excitation that is perpendicular to the locomotion direction. The bidirectional locomotion is achieved, and the direction of motion is determined by the vibration frequency. This new type of robot is useful for the unconventional environment where complex moving mechanisms cannot be applied to the rob

ABSTRACT Biocontrol using organisms like Pseudomonas alkylphenolica offers a viable alternative to chemical pesticides, enhancing plant growth and reducing environmental impact. This study details the genome of Pseudomonas alkylphenolica IMGN1, a strain known for promoting plant growth, advancing our understanding of biocontrol mechanisms.

BACKGROUND: Orthohantavirus hantanense (HTNV) poses a substantial global public health threat due to its role in causing hemorrhagic fever with renal syndrome (HFRS). HTNV outbreaks are particularly prevalent in the Gyeonggi and Gangwon Provinces of the Republic of Korea (ROK). This study aimed to evaluate the application of advanced nanopore sequencing and bioinformatics to generate complete genome sequences of HTNV, with the objective of accurately identifying infection sources and analyzing t