Newton Cheng - Academia.edu (original) (raw)

Papers by Newton Cheng

Electrical Performance of Electronic Packaging,, 2002

With the rapid advance of silicon process technology, it is now possible to design I10 circuits t... more With the rapid advance of silicon process technology, it is now possible to design I10 circuits that operate at multi-gigabit data rates. Rambus' next generation memory interface technology, code-named Yellowstone, utilizes bi-directional low-swing Differential Rambus Signaling Level (DRSL) with a data transfer rate starting at 3.2 Gbpdpair and scalable to 6.4 Gbpdpair. This paper describes the design and modeling methodology used to develop the Yellowstone memory channel with conventional interconnect technologies. First, the advantages of point-to-point differential signaling are discussed. Then, the design issues associated with low-cost conventional printed circuit boards (PCBs) and packages are described. This is followed by a discussion of the modeling issues associated with high data-rate channel design. A design and modeling methodology is proposed to ensure the robust operation of the Yellowstone memory channel. Finally, to illustrate the validity of the proposed modeling methodology, channel models are correlated with actual hardware at both component and system level in both time and frequency domains. 0-7803-7451-7/02/$17.00 0 2002 IEEE

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2001

Differential signaling is a popular choice for multi-gigabit digital applications such as FiberCh... more Differential signaling is a popular choice for multi-gigabit digital applications such as FiberChannel, Infiniband, OIF, RapidIO, and XAUI. This is due to the fact that differential signaling has the ability to reject common mode noise such as cross talk, simultaneous switching noise, power supply and ground bounce noise. To support differential signaling, differential transmission lines are required. There are several

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2003

The further scaling of chip performance into multi-gigabit data rates puts special demands on the... more The further scaling of chip performance into multi-gigabit data rates puts special demands on the bandwidth of interconnect systems. This leads to the need for careful optimization of the parameters of the channel and the components along the path of the signal and the need of special circuitry in transceivers to mitigate the effects of the band-limited channels. This paper

Acsm S Health Fitness Journal, Aug 31, 2011

Primary Care Diabetes, 2016

As the proportion of people with multiple chronic conditions grows, so does the complexity of pat... more As the proportion of people with multiple chronic conditions grows, so does the complexity of patient care. Although office-based visits to subspecialists are expected to be intense, due to the focused nature of the visit, the complexity of office-based visits to primary care physicians has yet to be explored in depth. To explore complexity, we looked at diabetes as a case study to determine whether and how the complexity of office-based visits varies by physician specialty type, as measured by the number of diagnoses reported per visits. The Medical Expenditure Panel Survey data is used to create a nationally-representative sample of adults who self-report a diabetes diagnosis, the specialty of the treating physician for their care, and the number of diagnoses for each visit. Using cross tabulations, the distribution of office-based visits are analyzed based on a categorization of patients by number of visit diagnoses, number of conditions reported, and type of physician seen. Almost 80 percent of visits made by adults with diabetes to subspecialist involved care for that single diagnosis; while 55 percent of visits to primary care involved care for at least one additional diagnosis. Almost 70 percent of visits in which only one diagnosis was reported were to subspecialist physicians. Almost 90 percent of visits in which four diagnoses were reported were to primary care physicians. Office-based visits to primary care physicians are made increasingly complex by growing population morbidity. Adults with diabetes report more conditions being cared for per visit with primary care physicians than with subspecialty physicians. Future studies into where our results hold for other chronic conditions would be beneficial. As recent United States legislation moves health care payment toward paying for value and population health, encounter complexity should be accommodated.

American Family Physician, May 1, 2014

American family physician, 2014

American family physician, 2012

Electrical Performance of Electronic Packaging,, 2002

With the rapid advance of silicon process technology, it is now possible to design I10 circuits t... more With the rapid advance of silicon process technology, it is now possible to design I10 circuits that operate at multi-gigabit data rates. Rambus' next generation memory interface technology, code-named Yellowstone, utilizes bi-directional low-swing Differential Rambus Signaling Level (DRSL) with a data transfer rate starting at 3.2 Gbpdpair and scalable to 6.4 Gbpdpair. This paper describes the design and modeling methodology used to develop the Yellowstone memory channel with conventional interconnect technologies. First, the advantages of point-to-point differential signaling are discussed. Then, the design issues associated with low-cost conventional printed circuit boards (PCBs) and packages are described. This is followed by a discussion of the modeling issues associated with high data-rate channel design. A design and modeling methodology is proposed to ensure the robust operation of the Yellowstone memory channel. Finally, to illustrate the validity of the proposed modeling methodology, channel models are correlated with actual hardware at both component and system level in both time and frequency domains. 0-7803-7451-7/02/$17.00 0 2002 IEEE

Obstetrics & Gynecology, 2014

ABSTRACT Expansion of medical school enrollment in the 1960s through 1980s has led to more baby b... more ABSTRACT Expansion of medical school enrollment in the 1960s through 1980s has led to more baby boomer physicians reaching retirement age. The objectives were to determine the number of obstetrician-gynecologists nearing retirement age and how eventual retirement will affect the future supply of obstetrician-gynecologists. This descriptive study was based on data from the most recent 5 years (2008-2013) of the American Medical Association Masterfile. A comparison of the data with the National Provider Identifier was used to correct for the known upward bias in retirement ages using the American Medical Association Masterfile alone. Physicians were included only if they described their active practice as being in obstetrics-gynecology. The primary outcome was discrete retention curves, akin to Kaplan-Meier curves. A decline in the number of obstetrics-gynecology practitioners began at 55 years old. The approximately 11,000 obstetrician-gynecologists nearing retirement (55-67 years old) is comparable to the number in residency and within 5 years of residency completion. Although those physicians nearing retirement were predominantly male, no differences in retirement curves were found between senior male and female obstetrician-gynecologists. The annual rate of retirement increased from 0.6% for 55 year olds to 4.3% for 65 year olds. Most retired by age 67 years. If all obstetrician-gynecologists retired 2 years later, an additional 900 health care practitioners would be available. The large cohort of obstetrician-gynecologists approaching retirement bears tracking, because the supply of young physicians is not anticipated to increase. Extending time until retirement will aid in reducing a pending shortage of obstetrician-gynecologists.

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2001

Differential signaling is a popular choice for multi-gigabit digital applications such as FiberCh... more Differential signaling is a popular choice for multi-gigabit digital applications such as FiberChannel, Infiniband, OIF, RapidIO, and XAUI. This is due to the fact that differential signaling has the ability to reject common mode noise such as cross talk, simultaneous switching noise, power supply and ground bounce noise. To support differential signaling, differential transmission lines are required. There are several

The Journal of the American Board of Family Medicine, 2014

Today&amp... more Today's US physician workforce principally comprises specialists trained in the care of specific chronic conditions in the outpatient setting. However, a majority of patients seeking care for most of 14 high-cost chronic conditions, for example hypertension, were more likely to see a primary care physician than a specialist physician (69% vs. 24%, respectively).

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2003

The further scaling of chip performance into multi-gigabit data rates puts special demands on the... more The further scaling of chip performance into multi-gigabit data rates puts special demands on the bandwidth of interconnect systems. This leads to the need for careful optimization of the parameters of the channel and the components along the path of the signal and the need of special circuitry in transceivers to mitigate the effects of the band-limited channels. This paper

Microwave, MTT-S International Symposium, 2005

The performance of multi-gigahertz interconnect systems is adversely impacted by non-ideal physic... more The performance of multi-gigahertz interconnect systems is adversely impacted by non-ideal physical effects such as attenuation, crosstalk, impedance mismatches, intersymbol interference, and by parameter variations due to process and environmental changes. Many of these non-ideal physical effects can be mitigated by selecting proper signaling topologies and techniques, by using judicious design rules, and by applying advanced circuitry and signal processing

Electrical Performance of Electronic Packaging,, 2002

With the rapid advance of silicon process technology, it is now possible to design I10 circuits t... more With the rapid advance of silicon process technology, it is now possible to design I10 circuits that operate at multi-gigabit data rates. Rambus' next generation memory interface technology, code-named Yellowstone, utilizes bi-directional low-swing Differential Rambus Signaling Level (DRSL) with a data transfer rate starting at 3.2 Gbpdpair and scalable to 6.4 Gbpdpair. This paper describes the design and modeling methodology used to develop the Yellowstone memory channel with conventional interconnect technologies. First, the advantages of point-to-point differential signaling are discussed. Then, the design issues associated with low-cost conventional printed circuit boards (PCBs) and packages are described. This is followed by a discussion of the modeling issues associated with high data-rate channel design. A design and modeling methodology is proposed to ensure the robust operation of the Yellowstone memory channel. Finally, to illustrate the validity of the proposed modeling methodology, channel models are correlated with actual hardware at both component and system level in both time and frequency domains. 0-7803-7451-7/02/$17.00 0 2002 IEEE

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2001

Differential signaling is a popular choice for multi-gigabit digital applications such as FiberCh... more Differential signaling is a popular choice for multi-gigabit digital applications such as FiberChannel, Infiniband, OIF, RapidIO, and XAUI. This is due to the fact that differential signaling has the ability to reject common mode noise such as cross talk, simultaneous switching noise, power supply and ground bounce noise. To support differential signaling, differential transmission lines are required. There are several

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2003

The further scaling of chip performance into multi-gigabit data rates puts special demands on the... more The further scaling of chip performance into multi-gigabit data rates puts special demands on the bandwidth of interconnect systems. This leads to the need for careful optimization of the parameters of the channel and the components along the path of the signal and the need of special circuitry in transceivers to mitigate the effects of the band-limited channels. This paper

Acsm S Health Fitness Journal, Aug 31, 2011

Primary Care Diabetes, 2016

As the proportion of people with multiple chronic conditions grows, so does the complexity of pat... more As the proportion of people with multiple chronic conditions grows, so does the complexity of patient care. Although office-based visits to subspecialists are expected to be intense, due to the focused nature of the visit, the complexity of office-based visits to primary care physicians has yet to be explored in depth. To explore complexity, we looked at diabetes as a case study to determine whether and how the complexity of office-based visits varies by physician specialty type, as measured by the number of diagnoses reported per visits. The Medical Expenditure Panel Survey data is used to create a nationally-representative sample of adults who self-report a diabetes diagnosis, the specialty of the treating physician for their care, and the number of diagnoses for each visit. Using cross tabulations, the distribution of office-based visits are analyzed based on a categorization of patients by number of visit diagnoses, number of conditions reported, and type of physician seen. Almost 80 percent of visits made by adults with diabetes to subspecialist involved care for that single diagnosis; while 55 percent of visits to primary care involved care for at least one additional diagnosis. Almost 70 percent of visits in which only one diagnosis was reported were to subspecialist physicians. Almost 90 percent of visits in which four diagnoses were reported were to primary care physicians. Office-based visits to primary care physicians are made increasingly complex by growing population morbidity. Adults with diabetes report more conditions being cared for per visit with primary care physicians than with subspecialty physicians. Future studies into where our results hold for other chronic conditions would be beneficial. As recent United States legislation moves health care payment toward paying for value and population health, encounter complexity should be accommodated.

American Family Physician, May 1, 2014

American family physician, 2014

American family physician, 2012

Electrical Performance of Electronic Packaging,, 2002

With the rapid advance of silicon process technology, it is now possible to design I10 circuits t... more With the rapid advance of silicon process technology, it is now possible to design I10 circuits that operate at multi-gigabit data rates. Rambus' next generation memory interface technology, code-named Yellowstone, utilizes bi-directional low-swing Differential Rambus Signaling Level (DRSL) with a data transfer rate starting at 3.2 Gbpdpair and scalable to 6.4 Gbpdpair. This paper describes the design and modeling methodology used to develop the Yellowstone memory channel with conventional interconnect technologies. First, the advantages of point-to-point differential signaling are discussed. Then, the design issues associated with low-cost conventional printed circuit boards (PCBs) and packages are described. This is followed by a discussion of the modeling issues associated with high data-rate channel design. A design and modeling methodology is proposed to ensure the robust operation of the Yellowstone memory channel. Finally, to illustrate the validity of the proposed modeling methodology, channel models are correlated with actual hardware at both component and system level in both time and frequency domains. 0-7803-7451-7/02/$17.00 0 2002 IEEE

Obstetrics & Gynecology, 2014

ABSTRACT Expansion of medical school enrollment in the 1960s through 1980s has led to more baby b... more ABSTRACT Expansion of medical school enrollment in the 1960s through 1980s has led to more baby boomer physicians reaching retirement age. The objectives were to determine the number of obstetrician-gynecologists nearing retirement age and how eventual retirement will affect the future supply of obstetrician-gynecologists. This descriptive study was based on data from the most recent 5 years (2008-2013) of the American Medical Association Masterfile. A comparison of the data with the National Provider Identifier was used to correct for the known upward bias in retirement ages using the American Medical Association Masterfile alone. Physicians were included only if they described their active practice as being in obstetrics-gynecology. The primary outcome was discrete retention curves, akin to Kaplan-Meier curves. A decline in the number of obstetrics-gynecology practitioners began at 55 years old. The approximately 11,000 obstetrician-gynecologists nearing retirement (55-67 years old) is comparable to the number in residency and within 5 years of residency completion. Although those physicians nearing retirement were predominantly male, no differences in retirement curves were found between senior male and female obstetrician-gynecologists. The annual rate of retirement increased from 0.6% for 55 year olds to 4.3% for 65 year olds. Most retired by age 67 years. If all obstetrician-gynecologists retired 2 years later, an additional 900 health care practitioners would be available. The large cohort of obstetrician-gynecologists approaching retirement bears tracking, because the supply of young physicians is not anticipated to increase. Extending time until retirement will aid in reducing a pending shortage of obstetrician-gynecologists.

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2001

Differential signaling is a popular choice for multi-gigabit digital applications such as FiberCh... more Differential signaling is a popular choice for multi-gigabit digital applications such as FiberChannel, Infiniband, OIF, RapidIO, and XAUI. This is due to the fact that differential signaling has the ability to reject common mode noise such as cross talk, simultaneous switching noise, power supply and ground bounce noise. To support differential signaling, differential transmission lines are required. There are several

The Journal of the American Board of Family Medicine, 2014

Today&amp... more Today's US physician workforce principally comprises specialists trained in the care of specific chronic conditions in the outpatient setting. However, a majority of patients seeking care for most of 14 high-cost chronic conditions, for example hypertension, were more likely to see a primary care physician than a specialist physician (69% vs. 24%, respectively).

IEEE Topical Meeting on Electrical Performance of Electronic Packaging, 2003

The further scaling of chip performance into multi-gigabit data rates puts special demands on the... more The further scaling of chip performance into multi-gigabit data rates puts special demands on the bandwidth of interconnect systems. This leads to the need for careful optimization of the parameters of the channel and the components along the path of the signal and the need of special circuitry in transceivers to mitigate the effects of the band-limited channels. This paper

Microwave, MTT-S International Symposium, 2005

The performance of multi-gigahertz interconnect systems is adversely impacted by non-ideal physic... more The performance of multi-gigahertz interconnect systems is adversely impacted by non-ideal physical effects such as attenuation, crosstalk, impedance mismatches, intersymbol interference, and by parameter variations due to process and environmental changes. Many of these non-ideal physical effects can be mitigated by selecting proper signaling topologies and techniques, by using judicious design rules, and by applying advanced circuitry and signal processing