Ashea megacephala, a new Peruvian genus and species is described. The specimens were collected on... more Ashea megacephala, a new Peruvian genus and species is described. The specimens were collected on mushrooms and mushroom-associated trees. This genus can be readily distinguished from the other genera of the subtribe Gyrophaenina by the large head and the three indistinctly articulated labial palpomeres. A key to the known genera of Gyrophaenina is provided. A habitus photograph and illustrations of diagnostic characters are also presented.
We report β-Ga 2 O 3 /diamond-like carbon (DLC) core-shell heterostructure nanowires fabricated b... more We report β-Ga 2 O 3 /diamond-like carbon (DLC) core-shell heterostructure nanowires fabricated by vapor-liquid-solid method and radio frequency plasma enhanced chemical vapor deposition (PECVD). Assynthesized β-Ga 2 O 3 nanowires have widths of 30-150 nm and outer shell DLC thickness was in the range of 20-30 nm. The products were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersed spectrometry (EDS). In addition, outer DLC layer was confirmed by Raman spectroscopy, which shows typical two Raman bands at 1550 cm −1 (G peak) and 1330 cm −1 (D peak) corresponding to disordered graphite peak.
Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066), 1997
In this paper, a robust speed control system with a permanent magnetic synchronous motor (PMSM) u... more In this paper, a robust speed control system with a permanent magnetic synchronous motor (PMSM) using a Kalman filter load torque observer is presented. Compared to other modern complex control algorithms, the observer algorithm is very simple and effective in reducing the effect of the disturbances. An IP speed controller using ITAE is used as the main controller, and the
A robust servo system is presented for the purpose of maintaining a good speed tracking, load reg... more A robust servo system is presented for the purpose of maintaining a good speed tracking, load regulating responses and unknown disturbance regulating responses. The proposed system, based on a feedforward control theory, consists of fuzzy sliding adaptive controller (FSAC), sliding mode torque observer (SMTO) and parameter controller (PC). FSAC is a sliding mode controller whose structure is continuously changed by
... 2504 256, August 1996. 4. IJ Cox, J. Kilian, T. Leighton and T. Shamoon, Secure Spread Spectr... more ... 2504 256, August 1996. 4. IJ Cox, J. Kilian, T. Leighton and T. Shamoon, Secure Spread Spectrum Watermarking for Multimedia, IEEE Trans. on Image Processing, vol. 6, no. 12, pp. 167341678, 1997. 5. DL Nicholson, Spread ...
Power Electronics and Motion Control International Conference, 2000
This paper describes two different systems which can compensate harmonic currents generated in th... more This paper describes two different systems which can compensate harmonic currents generated in the power network system. As nonlinear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration, noise in the power machinery. Many approaches have been applied to compensate
With the advent of the high-speed microprocessor and DSP, the possibility of executing a control ... more With the advent of the high-speed microprocessor and DSP, the possibility of executing a control strategy in the digital domain has become a reality. Therefore, by the use of a DSP controller instead of using the analog controller UC3879, a phase-shifted zero-voltage-switching (ZVS) full-bridge (FB) DC/DC power converter can be controlled easily. In this paper, a digital-to-phase shift PWM circuit
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Among the alternative energy sources, the solar energy is recognized as an important energy sourc... more Among the alternative energy sources, the solar energy is recognized as an important energy source and its application is increasing. Especially in future, the hybrid solar energy generation system with battery and fuel cell will be widely used as an independent distributed power generation system. In this paper, a solar power hybrid home generation system using a contactless power supply (CPS) that can transfer an electric power without any mechanical contact is proposed. The proposed system consists of a ZVS boost converter, a half bridge LLC resonant converter and contact-less transformer.
A taxonomic study of the genus Homalota Mannerheim in Korea is presented. Five species are recogn... more A taxonomic study of the genus Homalota Mannerheim in Korea is presented. Five species are recognized, one of which, Homalotaserrata (Assing), comb. n. is transferred from Anomognathus Solier. Homalotafraterna (Sharp), Homalotamikado Likovský, Homalotasauteri Bernhauer, and Homalotaserrata are newly added to the Korean fauna. A key, descriptions, and illustrations of the diagnostic characters are provided.
Maximum intensity projection (MIP) is a volume rendering technique that determines the pixel inte... more Maximum intensity projection (MIP) is a volume rendering technique that determines the pixel intensity as the maximum of all values sampled along the viewing direction. MIP has been successfully applied to diagnose bone fractures in computed tomography (CT) and the stenosis of vascular structures in magnetic resonance angiography (MRA). However, MIP has a major drawback in that the depth and occlusion information cannot be perceived in the output images. The most universal way to alleviate this problem is to occasionally change the viewpoint for depth perception. To support this function in real time, MIP should be performed at an interactive frame rate. We develop an efficient rendering algorithm for MIP so that MIP is performed at an interactive frame rate without a loss of image quality. The proposed method predicts the position of the maximum intensity for each ray using blockwise maximum bounds, after which it performs bidirectional compositing toward both ends of the ray from ...
38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003., 2003
Four types of boost converters are designed and fabricated and their operational characteristics ... more Four types of boost converters are designed and fabricated and their operational characteristics are analyzed using experimental results. Soft-switching boost converters are designed to satisfy the condition of input voltage 170-265 Vac, output voltage 400 Vdc, output current 5 A, output power 20 W-2000 W, and unit power factor. In addition, parameter values are designed so that system operation can
A taxonomic study of Korean Myrmecopora Saulcy is presented. Myrmecopora (Lamproxenusa) rufescens... more A taxonomic study of Korean Myrmecopora Saulcy is presented. Myrmecopora (Lamproxenusa) rufescens (Sharp) previously reported by Ahn was an incorrect identification of M. (L.) reticulata Assing. Diagnoses, habitus photographs and line drawings of diagnostic characters are provided.
The beetle family Sphindidae, represented by Aspidiphorus japonicus Reitter and A. sakaii Sasaji,... more The beetle family Sphindidae, represented by Aspidiphorus japonicus Reitter and A. sakaii Sasaji, are identified for the first time in Korea. Illustrations of habitus, descriptions, and line drawings of diagnostic characters are provided.
This paper presents a soft-switching average current control PWM high power factor boost converte... more This paper presents a soft-switching average current control PWM high power factor boost converter. Conventional boost ZVT-PWM converter has a disadvantage of hard-switching for auxiliary switch at turn-off. A soft switched auxiliary switch is proposed to achieve a high performance ZVT-PWM boost rectifier. The simulation and experimental results show that soft switching operation can be maintained for wide line and
This paper proposes a transformerless power conversion system which consists of a three-phase dio... more This paper proposes a transformerless power conversion system which consists of a three-phase diode rectifier and a shunt hybrid filter. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multilevel inverter. Compared with conventional active filters, transformers are not used and multilevel inverters are used. The LC filter works as not
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2002
The conventional three-level high frequency phase-shifted DC/DC converter has a disadvantage that... more The conventional three-level high frequency phase-shifted DC/DC converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current and RMS current stress, conduction losses of transformer and switching devices increases. To alleviate these problems, we propose an improved three-level zero voltage and zero current switching (ZVZCS) DC/DC converter using a tapped inductor, a snubber capacitor and two snubber diodes attached at the secondary side of transformer. The proposed ZVZCS converter is verified on a 7 kW, 30 kHz experimental prototype
APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058), 2000
Page 1. An Improved ZVZCS PWM FB DOC Converter Using the Modified Energy Recovery Snubber Eun-Soo... more Page 1. An Improved ZVZCS PWM FB DOC Converter Using the Modified Energy Recovery Snubber Eun-Soo Kim, Kee-Yeon Joe, Soon-Gu Park PE Division, Korea Electrotechnology Research Institute, Sungju dong 28-1, Chang ...
Proceedings of APEC 97 - Applied Power Electronics Conference, 1997
The conventional high frequency phase-shifted full-bridge DC/DC power converter has a disadvantag... more The conventional high frequency phase-shifted full-bridge DC/DC power converter has a disadvantage that a circulating current flows through the transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this paper provides a circulating current free-type high-frequency ZVZCS phase-shifted full bridge
Ashea megacephala, a new Peruvian genus and species is described. The specimens were collected on... more Ashea megacephala, a new Peruvian genus and species is described. The specimens were collected on mushrooms and mushroom-associated trees. This genus can be readily distinguished from the other genera of the subtribe Gyrophaenina by the large head and the three indistinctly articulated labial palpomeres. A key to the known genera of Gyrophaenina is provided. A habitus photograph and illustrations of diagnostic characters are also presented.
We report β-Ga 2 O 3 /diamond-like carbon (DLC) core-shell heterostructure nanowires fabricated b... more We report β-Ga 2 O 3 /diamond-like carbon (DLC) core-shell heterostructure nanowires fabricated by vapor-liquid-solid method and radio frequency plasma enhanced chemical vapor deposition (PECVD). Assynthesized β-Ga 2 O 3 nanowires have widths of 30-150 nm and outer shell DLC thickness was in the range of 20-30 nm. The products were examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersed spectrometry (EDS). In addition, outer DLC layer was confirmed by Raman spectroscopy, which shows typical two Raman bands at 1550 cm −1 (G peak) and 1330 cm −1 (D peak) corresponding to disordered graphite peak.
Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066), 1997
In this paper, a robust speed control system with a permanent magnetic synchronous motor (PMSM) u... more In this paper, a robust speed control system with a permanent magnetic synchronous motor (PMSM) using a Kalman filter load torque observer is presented. Compared to other modern complex control algorithms, the observer algorithm is very simple and effective in reducing the effect of the disturbances. An IP speed controller using ITAE is used as the main controller, and the
A robust servo system is presented for the purpose of maintaining a good speed tracking, load reg... more A robust servo system is presented for the purpose of maintaining a good speed tracking, load regulating responses and unknown disturbance regulating responses. The proposed system, based on a feedforward control theory, consists of fuzzy sliding adaptive controller (FSAC), sliding mode torque observer (SMTO) and parameter controller (PC). FSAC is a sliding mode controller whose structure is continuously changed by
... 2504 256, August 1996. 4. IJ Cox, J. Kilian, T. Leighton and T. Shamoon, Secure Spread Spectr... more ... 2504 256, August 1996. 4. IJ Cox, J. Kilian, T. Leighton and T. Shamoon, Secure Spread Spectrum Watermarking for Multimedia, IEEE Trans. on Image Processing, vol. 6, no. 12, pp. 167341678, 1997. 5. DL Nicholson, Spread ...
Power Electronics and Motion Control International Conference, 2000
This paper describes two different systems which can compensate harmonic currents generated in th... more This paper describes two different systems which can compensate harmonic currents generated in the power network system. As nonlinear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration, noise in the power machinery. Many approaches have been applied to compensate
With the advent of the high-speed microprocessor and DSP, the possibility of executing a control ... more With the advent of the high-speed microprocessor and DSP, the possibility of executing a control strategy in the digital domain has become a reality. Therefore, by the use of a DSP controller instead of using the analog controller UC3879, a phase-shifted zero-voltage-switching (ZVS) full-bridge (FB) DC/DC power converter can be controlled easily. In this paper, a digital-to-phase shift PWM circuit
2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
Among the alternative energy sources, the solar energy is recognized as an important energy sourc... more Among the alternative energy sources, the solar energy is recognized as an important energy source and its application is increasing. Especially in future, the hybrid solar energy generation system with battery and fuel cell will be widely used as an independent distributed power generation system. In this paper, a solar power hybrid home generation system using a contactless power supply (CPS) that can transfer an electric power without any mechanical contact is proposed. The proposed system consists of a ZVS boost converter, a half bridge LLC resonant converter and contact-less transformer.
A taxonomic study of the genus Homalota Mannerheim in Korea is presented. Five species are recogn... more A taxonomic study of the genus Homalota Mannerheim in Korea is presented. Five species are recognized, one of which, Homalotaserrata (Assing), comb. n. is transferred from Anomognathus Solier. Homalotafraterna (Sharp), Homalotamikado Likovský, Homalotasauteri Bernhauer, and Homalotaserrata are newly added to the Korean fauna. A key, descriptions, and illustrations of the diagnostic characters are provided.
Maximum intensity projection (MIP) is a volume rendering technique that determines the pixel inte... more Maximum intensity projection (MIP) is a volume rendering technique that determines the pixel intensity as the maximum of all values sampled along the viewing direction. MIP has been successfully applied to diagnose bone fractures in computed tomography (CT) and the stenosis of vascular structures in magnetic resonance angiography (MRA). However, MIP has a major drawback in that the depth and occlusion information cannot be perceived in the output images. The most universal way to alleviate this problem is to occasionally change the viewpoint for depth perception. To support this function in real time, MIP should be performed at an interactive frame rate. We develop an efficient rendering algorithm for MIP so that MIP is performed at an interactive frame rate without a loss of image quality. The proposed method predicts the position of the maximum intensity for each ray using blockwise maximum bounds, after which it performs bidirectional compositing toward both ends of the ray from ...
38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003., 2003
Four types of boost converters are designed and fabricated and their operational characteristics ... more Four types of boost converters are designed and fabricated and their operational characteristics are analyzed using experimental results. Soft-switching boost converters are designed to satisfy the condition of input voltage 170-265 Vac, output voltage 400 Vdc, output current 5 A, output power 20 W-2000 W, and unit power factor. In addition, parameter values are designed so that system operation can
A taxonomic study of Korean Myrmecopora Saulcy is presented. Myrmecopora (Lamproxenusa) rufescens... more A taxonomic study of Korean Myrmecopora Saulcy is presented. Myrmecopora (Lamproxenusa) rufescens (Sharp) previously reported by Ahn was an incorrect identification of M. (L.) reticulata Assing. Diagnoses, habitus photographs and line drawings of diagnostic characters are provided.
The beetle family Sphindidae, represented by Aspidiphorus japonicus Reitter and A. sakaii Sasaji,... more The beetle family Sphindidae, represented by Aspidiphorus japonicus Reitter and A. sakaii Sasaji, are identified for the first time in Korea. Illustrations of habitus, descriptions, and line drawings of diagnostic characters are provided.
This paper presents a soft-switching average current control PWM high power factor boost converte... more This paper presents a soft-switching average current control PWM high power factor boost converter. Conventional boost ZVT-PWM converter has a disadvantage of hard-switching for auxiliary switch at turn-off. A soft switched auxiliary switch is proposed to achieve a high performance ZVT-PWM boost rectifier. The simulation and experimental results show that soft switching operation can be maintained for wide line and
This paper proposes a transformerless power conversion system which consists of a three-phase dio... more This paper proposes a transformerless power conversion system which consists of a three-phase diode rectifier and a shunt hybrid filter. The hybrid filter consists of a single tuned LC filter per a phase and a low-rated NPC type multilevel inverter. Compared with conventional active filters, transformers are not used and multilevel inverters are used. The LC filter works as not
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2002
The conventional three-level high frequency phase-shifted DC/DC converter has a disadvantage that... more The conventional three-level high frequency phase-shifted DC/DC converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current and RMS current stress, conduction losses of transformer and switching devices increases. To alleviate these problems, we propose an improved three-level zero voltage and zero current switching (ZVZCS) DC/DC converter using a tapped inductor, a snubber capacitor and two snubber diodes attached at the secondary side of transformer. The proposed ZVZCS converter is verified on a 7 kW, 30 kHz experimental prototype
APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058), 2000
Page 1. An Improved ZVZCS PWM FB DOC Converter Using the Modified Energy Recovery Snubber Eun-Soo... more Page 1. An Improved ZVZCS PWM FB DOC Converter Using the Modified Energy Recovery Snubber Eun-Soo Kim, Kee-Yeon Joe, Soon-Gu Park PE Division, Korea Electrotechnology Research Institute, Sungju dong 28-1, Chang ...
Proceedings of APEC 97 - Applied Power Electronics Conference, 1997
The conventional high frequency phase-shifted full-bridge DC/DC power converter has a disadvantag... more The conventional high frequency phase-shifted full-bridge DC/DC power converter has a disadvantage that a circulating current flows through the transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this paper provides a circulating current free-type high-frequency ZVZCS phase-shifted full bridge
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Papers by Yoon-Ho Kim