Gus Lee

Augustus Samuel Mein-Sun Lee was born in San Francisco on August 8, 1946, the only son of Tsung-Chi Lee and Da-Tsien Tsu. His three sisters had been born in mainland China and accompanied his mother on the difficult trek across China to India and then to the United States in 1944. There, the family rejoined Tsung-Cbi, wbo had once been a major in the Kuomintang army and who, since 1939, had been working in San Francisco for the Bank of Canton. When Gus was only five, his mother died of breast cancer, and his father, two years later, married a severe Pennsylvania Dutch woman. Gus grew up in the Panhandle and the Haight, a predominantly African American area of San Francisco, and he had a difficult time becoming accepted. He joined the Young Men\u27s Christian Association (YMCA) and learned to box

Density of Yang-Lee zeros for the Ising ferromagnet

The densities of Yang-Lee zeros for the Ising ferromagnet on the $L\times L$ square lattice are evaluated from the exact grand partition functions ($L=3\sim16$). The properties of the density of Yang-Lee zeros are discussed as a function of temperature $T$ and system size $L$. The three different classes of phase transitions for the Ising ferromagnet, first-order phase transition, second-order phase transition, and Yang-Lee edge singularity, are clearly distinguished by estimating the magnetic scaling exponent $y_h$ from the densities of zeros for finite-size systems. The divergence of the density of zeros at Yang-Lee edge in high temperatures (Yang-Lee edge singularity), which has been detected only by the series expansion until now for the square-lattice Ising ferromagnet, is obtained from the finite-size data. The identification of the orders of phase transitions in small systems is also discussed using the density of Yang-Lee zeros.Comment: to appear in Physical Review

Diameter Perfect Lee Codes

Lee codes have been intensively studied for more than 40 years. Interest in these codes has been triggered by the Golomb-Welch conjecture on the existence of the perfect error-correcting Lee codes. In this paper we deal with the existence and enumeration of diameter perfect Lee codes. As main results we determine all $q$ for which there exists a linear diameter-4 perfect Lee code of word length $n$ over $Z_{q},$ and prove that for each $n\geq 3$ there are uncountable many diameter-4 perfect Lee codes of word length $n$ over $Z.$ This is in a strict contrast with perfect error-correcting Lee codes of word length $n$ over $Z\,$\ as there is a unique such code for $n=3,$ and its is conjectured that this is always the case when $2n+1$ is a prime. We produce diameter perfect Lee codes by an algebraic construction that is based on a group homomorphism. This will allow us to design an efficient algorithm for their decoding. We hope that this construction will turn out to be useful far beyond the scope of this paper

Issues in designing novel applications for multimedia technologies

Emerging computational multimedia tools and techniques promise powerful ways to organise, search and browse our ever-increasing multimedia contents by automating annotation and indexing, augmenting meta-data, understanding media contents, linking related pieces of information amongst them, and providing intriguing visualisation and exploration front-ends. Identifying real-world scenarios and designing interactive applications that leverage these developing multimedia technology is certainly an important research topic in itself but poses a number of challenges. In this talk, I will discuss and highlight some of these challenges in designing these novel applications by reflecting on my own design practice with a number of design examples

Robert E. Lee and Slavery

Robert E. Lee was the most successful Confederate military leader during the American Civil War (1861–1865). This also made him, by virtue of the Confederacy\u27s defense of chattel slavery, the most successful defender of the enslavement of African Americans. Yet his own personal record on both slavery and race is mottled with contradictions and ambivalence, all which were in plain view during his long career. Born into two of Virginia\u27s most prominent families, Lee spent his early years surrounded by enslaved African Americans, although that changed once he joined the Army. His wife, Mary Randolph Custis Lee, freed her own personal slaves, but her father, George Washington Parke Custis, still owned many people, and when he died, Robert E. Lee, as executor of his estate, was responsible for manumitting them within five years. He was widely criticized for taking the full five years. Lee and his wife supported the American Colonization Society before the war but resisted the abolitionist movement. Lee later insisted that his decision to support the Confederacy was not founded on a defense of slavery. During both the Maryland (1862) and Gettysburg (1863) campaigns, Lee\u27s officers kidnapped free blacks and sold them into slavery. By 1865, Lee supported the enlistment of African Americans into the Confederate army, but he surrendered before a plan could be implemented. After the war, he generally opposed racial and political equality for African Americans.[excerpt

Should we Banish Robert E. Lee & his Confederate Friends? Let\u27s Talk.

After 152 years, Robert E. Lee is back in the headlines. But not in any way he could have imagined. The “Unite the Right” forces descended on Charlottesville, Va., to protest calls for the removal of an equestrian statue of Lee that has been sitting in a city park since 1924. The larger question, however, was about whether the famous Confederate general was also a symbol of white supremacy. The same issues were in play in May when a statue of Lee was removed from Lee Circle in New Orleans. There are also more than two dozen streets and schools named for Lee that have become debating points about symbols of white nationalism. One Army installation in Petersburg, Va., bears Lee’s name; another, Fort Hamilton in New York City, names a driveway for him. (excerpt