Making recommendations bandwidth aware

This paper asks how much we can gain in terms of bandwidth and user satisfaction, if recommender systems became bandwidth aware and took into account not only the user preferences, but also the fact that they may need to serve these users under bandwidth constraints, as is the case over wireless networks. We formulate this as a new problem in the context of index coding: we relax the index coding requirements to capture scenarios where each client has preferences associated with messages. The client is satisfied to receive any message she does not already have, with a satisfaction proportional to her preference for that message. We consistently find, over a number of scenarios we sample, that although the optimization problems are in general NP-hard, significant bandwidth savings are possible even when restricted to polynomial time algorithms

Privacy in Index Coding: Improved Bounds and Coding Schemes

It was recently observed in [1], that in index coding, learning the coding matrix used by the server can pose privacy concerns: curious clients can extract information about the requests and side information of other clients. One approach to mitigate such concerns is the use of $k$-limited-access schemes [1], that restrict each client to learn only part of the index coding matrix, and in particular, at most $k$ rows. These schemes transform a linear index coding matrix of rank $T$ to an alternate one, such that each client needs to learn at most $k$ of the coding matrix rows to decode its requested message. This paper analyzes $k$-limited-access schemes. First, a worst-case scenario, where the total number of clients $n$ is $2^T-1$ is studied. For this case, a novel construction of the coding matrix is provided and shown to be order-optimal in the number of transmissions. Then, the case of a general $n$ is considered and two different schemes are designed and analytically and numerically assessed in their performance. It is shown that these schemes perform better than the one designed for the case $n=2^T-1$

A Multicomponent Intervention Helped Reducing Sugar-Sweetened Beverage Intake in Economically Disadvantaged Hispanic Children

This study aimed to examine the effect of a multicomponent intervention program on consumption of sugar-sweetened beverages (SSBs), and lifestyle factors associated with SSB intake, in Hispanic children from low-income families

Fissured Languages of Empire: Gender, Ethnicity, and Literature in Japan and Korea, 1930s-1950s

This dissertation investigates how Japanese-language literature by Korean writers both emerged out of and stood in opposition to discourses of national language, literature, and identity. The project is twofold in nature. First, I examine the rise of Japanese-language literature by Korean colonial subjects in the late 1930s and early 1940s, reassessing the sociopolitical factors involved in the production and consumption of these texts. Second, I trace how postwar reconstructions of ethnic nationality gave rise to the specific genre of zainichi (lit. "residing in Japan") literature. By situating these two valences together, I attempt to highlight the continuities among the established fields of colonial-period literature, modern Japanese literature, and modern Korean literature. Included in my analyses is a consideration of literature written by Japanese writers in Korea, transnational media and publishing culture in East Asia, the gender politics of national language, and the ways in which kominka (imperialization) policies were neither limited to the colonized alone nor completely erased after 1945. Rather than view the boundaries between "Japanese" and "Korean" literature as fixed or self-evident, this study examines the historical construction of these categories as generative discourses embedded in specific social, material, and political conditions. I do this through close analytical readings of a wide variety of primary texts written in Japanese by both Korean and Japanese writers, while contextualizing these readings in relation to the materiality of the literary journal. I also include a consideration of the canonization process over time, and the role literary criticism has played in actively shaping national canons. Chapter 1 centers around the 1940s "Korean boom," a term that refers to the marked rise in Japanese-language works published in the metropole on Korea and its culture, written by Japanese and Korean authors alike. Through broad intertextual analyses of major Japanese literary journals and influential texts by Korean writers produced during the "Korean boom," I examine the role played by the Japanese publishing industry in promoting the inclusion of Koreans in the empire while simultaneously excluding them from the privileged space of the nation. I also deconstruct the myth of a single "Korean" people, and consider how an individual's position within the uneven playing field of colonialism may shift according to gender and class. Chapter 2 deals with the ideologies of kokugo (national language; here, Japanese) and kokumin bungaku (national literature) during the latter years of Japan's imperial rule. The major texts I introduce in this chapter include Obi Juzo's "Tohan" (Ascent, 1944), first printed in the Japanese-language journal Kokumin bungaku based in Keijo (present-day Seoul); a comparison of the kominka essays written by Yi Kwangsu in Korean and Japanese; and the short story "Aikoku kodomo tai" (Patriotic Children's Squad, 1941), written by a Korean schoolgirl named Yi Chongnae. Through these texts, I show how kokumin bungaku depended upon the inclusion of colonial writers but simultaneously denied them an autonomy outside the strictures of the Japanese language, or kokugo. In Chapter 3, I move to Occupation-period Japan and the writings of Kim Talsu, Miyamoto Yuriko, and Nakano Shigeharu. While Koreans celebrated Japan's defeat as a day of independence from colonial rule, the political status of Koreans in Korea and in Japan remained far from independent under Allied policy. I outline the complicated factors that led to the creation of a stateless Korean diaspora in Japan and highlight the responses of Korean and Japanese writers who saw these political conditions as a sign of an imperialist system still insidiously intact. In looking at Kim Talsu's fiction in particular, I am able to examine both the continuities and discontinuities in definitions of national language, literature, and ethnicity that occurred across 1945 and map out the evolving position of Koreans in Japan. Chapter 4 compares the collaboration debates that occurred in post-1945 Korea with the arguments over war responsibility that occurred in Japan in the same period, focusing on the writings of Chang Hyokchu and Tanaka Hidemitsu. Although the works of both individuals have been neglected in contemporary literary scholarship, I argue that their postwar writings reveal how Korean collaboration (ch'inilp'a) and Japanese war responsibility (senso sekinin) emerged as mutually constitutive discourses that embodied - rather than healed - the traumas of colonialism and empire. Finally, in the epilogue of this dissertation, I introduce the writings of the self-identified zainichi author Yi Yangji in order to consider how all of the historical developments outlined in the previous chapters still exist as lived realities for many zainichi Koreans even today

Corporate governance reform in Japan and South Korea: Two paths of globalization

This paper examines the effect of global pressures on local institutions in a comparative study of corporate governance reform in Japan and South Korea. In the literature on business systems and institutional change, globalization often appears as a monolithic force that either overwhelms all in its path through convergence or is rejected. In this paper, we demonstrate that globalization, in the form of the spread of Anglo-American corporate governance to East Asia, resulted in neither convergence nor rejection, but rather, in two different paths of change. We argue that differences in patterns of reform stemmed from the divergent ways in which local actors-the state, shareholder activists, and large corporations-interacted with each other, and with foreign investors, to respond to external pressures. Two key factors defined these interactions: resource dependencies on global capital, and the way in which local actors framed the concept of corporate governance to fit their ideologies and advance their own interests