Hong-Sung Chang
Samsung
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Publication
Featured researches published by Hong-Sung Chang.
Solid State Ionics | 2002
Hong-Sung Chang; Jung-Hwa Kim; Jung-Woo Cho; Hyun-Wuk Kim; Kyung-In Choi
Abstract Materials and processes for water management electrode, efficient flow field, low cost ionomer membrane and stack design for proton exchange membrane fuel cell (PEMFC) also with methanol oxidation catalyst, liquid diffusion electrode, low methanol cross-over membrane and efficient monopolar cell pack design for direct methanol fuel cell (DMFC) are discussed. These include the technical achievements of small PEMFC (Membrane and Electrode Assembly (MEA): 400 mW/cm 2 with non-humidified H 2 /air, 1 Bar, 30 °C; membrane: 0.1 S/cm; stack: 40 and 200 W with no peripheral) and miniaturized DMFC (MEA: 50 mW/cm 2 with 2 M methanol and 1 Bar air at 30 °C; membrane: hybrid; cell pack: 600 mW). Further studies for the realization of these technologies are also suggested.
vehicular technology conference | 2005
Jee-Young Song; Hyun-Ho Choi; Hyun-dae Kim; Sang-Wook Kwon; Dong-Ho Cho; Hong-Sung Chang; Geunwhi Lim; Jun-Hyung Kim
We analyzed four systems designed for high-data rate transmission such as IEEE 802.16d OFDMA5 3GPP TD-CDMA, 3GPP2 cdma2000 1xEV-DO, and IEEE 802.11a WLAN, and compared their efficiency, the number of VoIP user, and the normalized number of VoIP user per 1 MHz. It is shown that the 802.16 system serves the most number of VoIP user, and the normalized number of user per 1 MHz is also the most. Even though 802.11a system is operated over the widest band, it supports the less number of user compared to the 802.16 system with smaller bandwidth, due to the inefficiency of CSMA/CA scheme. TD-CDMA and 1xEV-DO serve the same number of VoIP user per 1 MHz bandwidth, and TD-CDMA performs with the best efficiency among four systems. Comparing with TD-CDMA and 1xEV-DO, we concluded that 802.16d OFDMA system is the most flexible to assign its resource to users due to its finest granularity among three systems.
Archive | 2005
Hyon-Goo Kang; Seung-Eun Hong; Yeong-Moon Son; Geun-Hwi Lim; So-Hyun Kim; Chang-Hoi Koo; Jae-Jeong Shim; Jung-Won Kim; Jung-Shin Park; Jung-Je Son; Hong-Sung Chang
Archive | 2004
Dong-Koon Kong; Tae-Won Kim; Hong-Sung Chang; Jong-Bum Pyo
Archive | 2005
Hyon-Goo Kang; Bong-Gee Song; Kwang-Seop Eom; Seung-Eun Hong; Yeong-Moon Son; So-Hyun Kim; Seung-Il Yoon; Tae-Won Kim; Geun-Hwi Lim; Jung-Shin Park; Jae-Jeong Shim; Hong-Sung Chang; Yong Chang
Archive | 2006
Geun-Hwi Lim; Jun-Hyung Kim; Hong-Sung Chang; Yong Chang
Archive | 2004
Sang-Do Lee; Jin-Man Kim; Tae-Won Kim; Hong-Sung Chang; Jae-Jeong Shim; Geun-Hwi Lim; Je-Hyun Jung
Archive | 2005
Jung-Shin Park; Geun-Hwi Lim; Hong-Sung Chang; Jae-Jeong Shim
Archive | 2005
Hyun-Jeong Kang; Seung-Eun Hong; Hyon-Goo Kang; Hong-Sung Chang; Jung-Shin Park; Chang-Hoi Koo; Geun-Hwi Lim; Sung-jin Lee; So-Hyun Kim; Yeong-Moon Son; Hyoung-Kyu Lim; Jae-Jeong Shim; Jung-Je Son
Archive | 2005
Jae-Jeong Shim; Geun-Hwi Lim; Hong-Sung Chang; Jung-Shin Park