The treatment of spontaneous coronary dissection extending to the Valsalva sinus during percutaneous coronary intervention with primary stenting

Aortocoronary dissections are among the rare complications of percutaneous coronary interventions. Occasionally, coronary dissections can be the triggering factor for aortocoronary dissection. In this case, the dissection in the coronary artery may extend to the Valsalva sinus and ascending aorta progressively. In this article, we present and discuss a 54-year-old male who underwent percutaneous coronary intervention for acute inferior myocardial infarction. The aetiology for right coronary artery occlusion appeared to be spontaneous coronary dissection which extended to the Valsalva sinus. After treatment with primary stenting, the 6-month follow up results are presented here.Aortocoronary dissections are among the rare complications of percutaneous coronary interventions. Occasionally, coronary dissections can be the triggering factor for aortocoronary dissection. In this case, the dissection in the coronary artery may extend to the Valsalva sinus and ascending aorta progressively. In this article, we present and discuss a 54-year-old male who underwent percutaneous coronary intervention for acute inferior myocardial infarction. The aetiology for right coronary artery occlusion appeared to be spontaneous coronary dissection which extended to the Valsalva sinus. After treatment with primary stenting, the 6-month follow up results are presented here

Ragged Men on the Move: Poverty, Inertia and Friendship in Latife Tekin’s Swords of Ice (1989/tr.2007)

Latife Tekin’s Swords of Ice (1989/tr.2007) depicts the lives of Halilhan and his best friend Gogi, “ragged men” from Istanbul’s “outer most belt” (18).  Smart, spiritual, and naïve, Gogi tries to help Halilhan, although Halilhan tricks his brothers and misuses company funds to buy a second-hand red Volvo. While the Volvo is the techne for upward mobility, power and status, Halilhan recognizes that his well-tuned friendship with Gogi is vital to escape the poverty that their neighborhood imposes. This paper analyzes the friendship between Gogi and Halilhan, as they mark a fragile transgression of territorial boundaries, class norms, and socio-political values. &nbsp

Crisis innovation:A study of Michelin-starred restaurants' strategic renewal and alignment

Purpose: Using the lens of crisis innovation and strategic alignment, this study explores how a segment of the restaurant sector that may be less agile than others — Michelin-starred restaurants — perceives and aligns with the challenges brought about by the COVID-19-pandemic. Design/methodology/approach: The study collected data from 19 Michelin-starred restaurants in Spain using a qualitative interview method. The data were analyzed qualitatively and organized thematically. Findings: Four key categories of strategic challenges were identified: human resources, uncertainty, control and economic challenges. In response, chefs displayed both behavioral and organizational strategies. Those organizational strategies were new human resource management, reorganization, product and service innovation and marketing. While the new human resource management actions adopted to align with the human resource challenges identified, a misalignment remains between some of the other strategic actions, such as product and service innovation, marketing and economic and uncertainty challenges. Originality/value The findings offer new insight into Michelin-starred restaurant chefs' challenges and (mis)alignment strategies, an area that has been understudied in the current literature on innovative responses in the hospitality sector post-pandemic

The Effect of History Teaching Supported by Dramatization Technique on Students’ Achievement and Permanence Level

The aim of this study is to determine the effect of history teaching supported by dramatization technique on students’ success and permanence in history education in comparison with the traditional teaching. In this research, the semi experimental method which was practiced by pre-test, post-test and permanence test were used and it was studied on two different student groups. One of them is control group tested with lecture method and the other one is experimental group tested by dramatization technique. Tested group consists of 63 students who studying in classes 10-A and 10-B of a vocational high school of Kırıkkale. This study is limited with units of “From Principality to State” in 10th grade students. During this experiment containing retention test were applied to experimental and control groups and the results were analyzed by the program SPSS 16.0. According to the findings obtained, in history lesson: there is a significant difference between the points of success and permanence of the group which is tested by dramatization technique and the group which is tested by teacher centered teaching. In other words, the dramatization technique, which actively involved students in the learning environment, was found to be more effective in the educational success of students and permanence of the information they learned compared to the teacher centered approach on the transfer of historical information to the students

Analysis of a group purchasing organization under demand and price uncertainty

Based on an industrial case study, we present a stochastic model of a supply chain consisting of a set of buyers and suppliers and a group purchasing organization (GPO). The GPO combines orders from buyers in a two-period model. Demand and price in the second period are random. An advance selling opportunity is available to all suppliers and buyers in the first-period market. Buyers decide how much to buy through the GPO in the first period and how much to procure from the market at a lower or higher price in the second period. Suppliers determine the amount of capacity to sell through the GPO in the first period and to hold in reserve in order to meet demand in the second period. The GPO conducts a uniform-price reverse auction to select suppliers and decides on the price that will be offered to buyers to maximize its profit. By determining the optimal decisions of buyers, suppliers, and the GPO, we answer the following questions: Do suppliers and buyers benefit from working with a GPO? How do the uncertainty in demand, the share of GPO orders in the advance sales market, and the uncertainty in price influence the players’ decisions and profits? What are the characteristics of an environment that would encourage suppliers and buyers to work with a GPO? We show that a GPO helps buyers and suppliers to mitigate demand and price risks effectively while collecting a premium by serving as an intermediary between them

Optimal Deceptive and Reference Policies for Supervisory Control

The use of deceptive strategies is important for an agent that attempts not to reveal his intentions in an adversarial environment. We consider a setting in which a supervisor provides a reference policy and expects an agent to follow the reference policy and perform a task. The agent may instead follow a different, deceptive policy to achieve a different task. We model the environment and the behavior of the agent with a Markov decision process, represent the tasks of the agent and the supervisor with linear temporal logic formulae, and study the synthesis of optimal deceptive policies for such agents. We also study the synthesis of optimal reference policies that prevents deceptive strategies of the agent and achieves the supervisor's task with high probability. We show that the synthesis of deceptive policies has a convex optimization problem formulation, while the synthesis of reference policies requires solving a nonconvex optimization problem.Comment: 20 page

Alternating Direction Method of Multipliers for Decomposable Saddle-Point Problems

Saddle-point problems appear in various settings including machine learning, zero-sum stochastic games, and regression problems. We consider decomposable saddle-point problems and study an extension of the alternating direction method of multipliers to such saddle-point problems. Instead of solving the original saddle-point problem directly, this algorithm solves smaller saddle-point problems by exploiting the decomposable structure. We show the convergence of this algorithm for convex-concave saddle-point problems under a mild assumption. We also provide a sufficient condition for which the assumption holds. We demonstrate the convergence properties of the saddle-point alternating direction method of multipliers with numerical examples on a power allocation problem in communication channels and a network routing problem with adversarial costs.Comment: Accepted to 58th Annual Allerton Conference on Communication, Control, and Computin

Smooth Convex Optimization using Sub-Zeroth-Order Oracles

We consider the problem of minimizing a smooth, Lipschitz, convex function over a compact, convex set using sub-zeroth-order oracles: an oracle that outputs the sign of the directional derivative for a given point and a given direction, an oracle that compares the function values for a given pair of points, and an oracle that outputs a noisy function value for a given point. We show that the sample complexity of optimization using these oracles is polynomial in the relevant parameters. The optimization algorithm that we provide for the comparator oracle is the first algorithm with a known rate of convergence that is polynomial in the number of dimensions. We also give an algorithm for the noisy-value oracle that incurs a regret of $\tilde{\mathcal{O}}(n^{3.75} T^{0.75})$ (ignoring the other factors and logarithmic dependencies) where $n$ is the number of dimensions and $T$ is the number of queries.Comment: Extended version of the accepted paper in the 35th AAAI Conference on Artificial Intelligence 2021. 19 pages including supplementary materia