Changing Demographic, Social, and Economic Conditions in Karachi City, 1959–94: A Preliminary Analysis

Kingsley Davis (1961) had argued that the reason that the ancient cities failed to survive was that they were too deadly. He suggested that “three of their (cities) main traits....the crowding of many people in little space, their dependence on widespread contacts (due to in-migration), and their wealth...laid them open to contagious diseases, environmental contamination, occasional starvation and warfare”. Even in the medieval age, some European cities provide examples of such problems; but especially so following the Industrial Revolution. Do the events of the 1980s and the 1990s in Karachi suggest that the city may be heading in the same direction. Recently, The Times London in a lead article in November 1994, labelled Karachi as a “City of Riches and Shattered Dreams”. It further said that Karachi had grown into a megalopolis where life moved fast and street violence had become a norm. Indeed, more than 65 percent of Pakistan’s industries and 80 percent of its finance, banking, and business are concentrated in the city and people come to it from all over the country to find jobs and fulfil their dreams [Husain (1994)]. During the past decade, street violence in the form of ethnic clashes has become a sort of regular event in Karachi. At times, these clashes have been more frequent and even bloodier than the ones before. According to the local newspaper accounts, between 1985 and 1988 (in four years), about 400 people died in Karachi due to violence, which has increased substantially over time. Thus, while the number of violent deaths remained between 350–500 during 1991–93, in 1994 alone the number exceeded 1,100, and during the first three months of 1995, over 300 persons have died due to violence.

Socio-economic Development, Population Policies, and Fertility Decline in Muslim Countries

Islam is one of the world’s major monotheistic religions. Its followers, spread all over the world and numbering about 1.5 billion people, constitute about one-fourth of the world’s population. The Economist (2003). Muslims are mainly concentrated in about 50 countries, most of which have had slow pace of fertility transition, mainly due to low level of socio-economic development, on the one hand, and lack of effective population policy, on the other. With the help of macro level data available on Muslimmajority countries, this paper examines fertility decline in these countries, their socio-economic indicators, and support for family planning. Examples from two neighbouring countries—Pakistan and Iran—are also given.Population Policy, Fertility

Poor Performance of Health and Population Welfare Programmes in Sindh: Case Studies in Governance Failure

Over the past few years, the issue of what is meant by “good governance” has generated increasing attention and debate both at the national and international level [Streeten (1997)]. The role of state and how that role is to be exercised is appearing high on the agenda of politicians, policy-makers and academicians in the developing world. Governance has been defined by the World Bank as “the manner in which power is exercised in the management of the country’s economic and social resources” [World Bank (1994)]. The somewhat narrow scope of this definition has been broadened in recent years to “the sum of the many ways individuals and institutions, public and private, manage their common affairs” [Commission on Global Governance (995)] The Human Development Report [UNDP (1999)] goes beyond these definitions and gives a much more radical notion of good governance, underpinning the importance of peoples’ participation in shaping their own governance and development. This type of governance has been labeled as “humane governance”. A review of existing literature thus shows that governance has been interpreted to have different elements such as management of economic and social resources for development, formulation and implementation of policies, discharging of functions, accommodation of diverse interests towards cooperative action and above all, accountability to people and ownership by the people of the governance process. In view of the above, one may ask what constitutes good governance for the health sector? Management of resources pertains to the concept of efficiency, a term appearing with increasing frequency in global literature on health care reforms; policy formulation and discharging of functions allude to the objective of effectiveness which itself has a wide scope encompassing relevance, quality and availability of health care; while “humane governance” brings in the notion of community participation and accountability with regards to decision-making and delivery of health care.

Burden and Depression among Caregivers of Visually Impaired Patients in a Canadian Population

Purpose/Background. This study reports the degree of burden and the proportion at risk for depression among individuals who provide care to visually impaired patients. Study Design. This is clinic-based, cross-sectional survey in a tertiary care hospital. Methods. Caregivers were considered unpaid family members for patients whose sole impairment was visual. Patients were stratified by vision in their better seeing eye into two groups: Group 1 had visual acuity between 6/18 and 6/60 and Group 2 were those who had 6/60 or worse. Burden was evaluated by the Burden Index of Caregivers and the prevalence of being at risk for depression was determined by the Center for Epidemiologic Studies Depression scale. Results. 236 caregivers of 236 patients were included. Total mean BIC scores were higher in Group 2. Female caregivers, caregivers providing greater hours of care, and caregivers of patients who have not completed vision rehabilitation programs are at higher risk for depression

Supersolids in confined fermions on one-dimensional optical lattices

Using quantum Monte Carlo simulations, we show that density-density and pairing correlation functions of the one-dimensional attractive fermionic Hubbard model in a harmonic confinement potential are characterized by the anomalous dimension $K_\rho$ of a corresponding periodic system, and hence display quantum critical behavior. The corresponding fluctuations render the SU(2) symmetry breaking by the confining potential irrelevant, leading to structure form factors for both correlation functions that scale with the same exponent upon increasing the system size, thus giving rise to a (quasi)supersolid.Comment: 4 pages, 5 figures, published versio

Instantly Decodable Network Coding for Real-Time Scalable Video Broadcast over Wireless Networks

In this paper, we study a real-time scalable video broadcast over wireless networks in instantly decodable network coded (IDNC) systems. Such real-time scalable video has a hard deadline and imposes a decoding order on the video layers.We first derive the upper bound on the probability that the individual completion times of all receivers meet the deadline. Using this probability, we design two prioritized IDNC algorithms, namely the expanding window IDNC (EW-IDNC) algorithm and the non-overlapping window IDNC (NOW-IDNC) algorithm. These algorithms provide a high level of protection to the most important video layer before considering additional video layers in coding decisions. Moreover, in these algorithms, we select an appropriate packet combination over a given number of video layers so that these video layers are decoded by the maximum number of receivers before the deadline. We formulate this packet selection problem as a two-stage maximal clique selection problem over an IDNC graph. Simulation results over a real scalable video stream show that our proposed EW-IDNC and NOW-IDNC algorithms improve the received video quality compared to the existing IDNC algorithms

The crossover from collective motion to periphery diffusion for 2D adatom-islands on Cu(111)

The diffusion of two dimensional adatom islands (up to 100 atoms) on Cu(111) has been studied, using the self-learning Kinetic Monte Carlo (SLKMC) method [1]. A variety of multiple- and single-atom processes are revealed in the simulations, and the size dependence of the diffusion coefficients and effective diffusion barriers are calculated for each. From the tabulated frequencies of events found in the simulation, we show a crossover from diffusion due to the collective motion of the island to a regime in which the island diffuses through periphery-dominated mass transport. This crossover occurs for island sizes between 13 and 19 atoms. For islands containing 19 to 100 atoms the scaling exponent is 1.5, which is in good agreement with previous work. The diffusion of islands containing 2 to 13 atoms can be explained primarily on the basis of a linear increase of the barrier for the collective motion with the size of the island

Delivery Time Reduction for Order-Constrained Applications using Binary Network Codes

Consider a radio access network wherein a base-station is required to deliver a set of order-constrained messages to a set of users over independent erasure channels. This paper studies the delivery time reduction problem using instantly decodable network coding (IDNC). Motivated by time-critical and order-constrained applications, the delivery time is defined, at each transmission, as the number of undelivered messages. The delivery time minimization problem being computationally intractable, most of the existing literature on IDNC propose sub-optimal online solutions. This paper suggests a novel method for solving the problem by introducing the delivery delay as a measure of distance to optimality. An expression characterizing the delivery time using the delivery delay is derived, allowing the approximation of the delivery time minimization problem by an optimization problem involving the delivery delay. The problem is, then, formulated as a maximum weight clique selection problem over the IDNC graph wherein the weight of each vertex reflects its corresponding user and message's delay. Simulation results suggest that the proposed solution achieves lower delivery and completion times as compared to the best-known heuristics for delivery time reduction