New Bounds for the Dichromatic Number of a Digraph

The chromatic number of a graph $G$, denoted by $\chi(G)$, is the minimum $k$ such that $G$ admits a $k$-coloring of its vertex set in such a way that each color class is an independent set (a set of pairwise non-adjacent vertices). The dichromatic number of a digraph $D$, denoted by $\chi_A(D)$, is the minimum $k$ such that $D$ admits a $k$-coloring of its vertex set in such a way that each color class is acyclic. In 1976, Bondy proved that the chromatic number of a digraph $D$ is at most its circumference, the length of a longest cycle. Given a digraph $D$, we will construct three different graphs whose chromatic numbers bound $\chi_A(D)$. Moreover, we prove: i) for integers $k\geq 2$, $s\geq 1$ and $r_1, \ldots, r_s$ with $k\geq r_i\geq 0$ and $r_i\neq 1$ for each $i\in[s]$, that if all cycles in $D$ have length $r$ modulo $k$ for some $r\in\{r_1,\ldots,r_s\}$, then $\chi_A(D)\leq 2s+1$; ii) if $D$ has girth $g$ and there are integers $k$ and $p$, with $k\geq g-1\geq p\geq 1$ such that $D$ contains no cycle of length $r$ modulo $\lceil \frac{k}{p} \rceil p$ for each $r\in \{-p+2,\ldots,0,\ldots,p\}$, then $\chi_A (D)\leq \lceil \frac{k}{p} \rceil$; iii) if $D$ has girth $g$, the length of a shortest cycle, and circumference $c$, then $\chi_A(D)\leq \lceil \frac{c-1}{g-1} \rceil +1$, which improves, substantially, the bound proposed by Bondy. Our results show that if we have more information about the lengths of cycles in a digraph, then we can improve the bounds for the dichromatic number known until now.Comment: 14 page

The Theory and Practice of International Social Work Is Affected by a History of Colonialism

International social work is taught under colonial terms. As a result, there is an unequal relationship between the global North and the global South when collaborating on social work projects. This also affects the way people learn about international social work. Since many students come from countries outside the global North, they challenge a Western world view on international social work issues.York's Knowledge Mobilization Unit provides services and funding for faculty, graduate students, and community organizations seeking to maximize the impact of academic research and expertise on public policy, social programming, and professional practice. It is supported by SSHRC and CIHR grants, and by the Office of the Vice-President Research & Innovation. [email protected] www.researchimpact.c

Género y Medio Ambiente

El objetivo de este módulo es proporcionar elementos de análisis sobre la relación entre género y medio ambiente en el marco de los desafíos actuales respecto del uso, explotación y cuidado de los recursos naturales, la recuperación de saberes locales y el cambio climático. La ecología política, así como las contribuciones de los feminismos contemporáneos aportan a visibilizar las desigualdades en acceso a recursos entre varones y mujeres, las capacidades de agencia e iniciativa de las mujeres, de poblaciones locales y organizaciones de la sociedad civil. Este manual incluye cuatro secciones: a) cuerpo, naturaleza, territorio; b) vida cotidiana, economía del cuidado, economía mundial; c) saberes, representaciones, derechos y discursos; d) agencia y vulnerabilidad, iniciativas y políticas

Tractaments fisioterapèutics per millorar la vida dels afectats de lesions de medul·la espinal

Les lesions de medul·la espinal poden causar trastorns motors del sistema nerviós, presentant contraccions musculars. Aquests síntomes constitueixen l'espasticitat i provoquen alteracions del moviment i de les funcions musculars. Les contraccions, els espasmes i els hiperreflexos musculars dificulten encara més el dia a dia dels afectats per lesions de medul·la espinal. Aquesta tesi doctoral ha estudiat els efectes dels tractaments basats en l'aplicació de vibracions als músculs i l'estimulació magnètica en zones del cervell. Els resultats d'aquests tractaments han resultat ser molt positius encara que no aconsegueixen una normalització total dels moviments musculars.Las lesiones de médula espinal pueden causar trastornos motores del sistema nervioso presentando contracciones musculares. Estos síntomas constituyen la espasticidad y provocan alteraciones del movimiento y de las funciones musculares. Las contracciones, los espasmos y los hipereflejos musculares dificultan aún más el día a día de los afectados por lesiones de médula espinal. Esta tesis doctoral ha estudiado los efectos de los tratamientos basados en la aplicación de vibraciones en los músculos y en la estimulación magnética en zonas del cerebro. Los resultados de estos tratamientos han resultado ser muy positivos aunque no consiguen una normalización total de los movimientos musculares

Social Work Is a Form of Professional Imperialism between the Global North and Global South

Students in the field of social work have the opportunity to gain international experience. However, their encounters with the global South can re-enforce global inequalities. While the intent is to support human rights, there are spatial differences between students and their local partners. Students from the global North come into their work with privilege, which affects how they see the spaces they enter and exit. This is an example of professional imperialism. For minoritized student in social work, this experience is more complicated. Even though they come into these spaces holding privilege from the global North, they are also marginalized because they do not meet the global image of Canada as being “white”.York's Knowledge Mobilization Unit provides services and funding for faculty, graduate students, and community organizations seeking to maximize the impact of academic research and expertise on public policy, social programming, and professional practice. It is supported by SSHRC and CIHR grants, and by the Office of the Vice-President Research & Innovation. [email protected] www.researchimpact.c

Recent Veterans’ Self-Management of Health During Military to Civilian Life Transition: A Grounded Theory Study

United States Veterans of combat within Iraq and/or Afghanistan return home to face an array of somatic and psychological health concerns. Little was known about how they manage their health after military discharge. The research question for this study was “how do OIF/OEF/OND combat Veterans and their primary support persons manage Veterans’ health at home?” There is little information about these Veterans’ perspective of self-management of health in the home. This study was designed to provide a theoretical understanding of self-management and family support in this population. The Family Management Style Framework (Knafl, Deatrick & Havill, 2012) was used as a sensitizing framework. This grounded theory study furthered development of the constructs within the Family Management Style Framework and addressed unique characteristics of the Veteran population. Using purposive, theoretical, and snowball sampling strategies, Veterans and support persons were recruited from American Legion posts within District 14, California. Fifteen Veterans and five support persons were interviewed. Data collection occurred at one point in time using field observations and semi-structured interviews. Data analysis consisted of open, axial and selective coding (Corbin & Strauss, 2008) with constant comparative methods. Veterans described four interacting dimensions of health: physical, mental/behavioral, relationship and career health. The core concept identified was the military to civilian life transition they experienced when they returned from deployment. Veterans’ experienced health and self-management changes over time during this transition. The transition outcomes identified were continuing military mindfulness, engaging in civilian life and acclimating to civilian life. Study findings inform the healthcare community of Veterans’ health perspective and unique needs. Self-management of health is a dynamic phenomenon during the transition from military to civilian life. This study contributed to knowledge for researchers and clinicians who aim to help Veterans to successfully return to civilian life from military life. Structured transition support early in the transition may benefit Vetera

SURVEI TENTANG TINGKAT KEBUGARAN JASMANI DALAM PEMANFAATAN WAKTU TERLUANG PADA MAHASISWA PUTRA PRODI IKOR ANGKATAN 2017

Kebugaran jasmani adalah kondisi dimana ketika tubuh dapat melakukan segala aktivitas berat maupun ringan yang memerlukan sejumlah tenaga tanpa kelelahan yang berarti dan masih mempunyai cadangan energi untuk melakukan sejumlah aktivitas yang mendadak. Kebugaran jasmani sangat penting untuk mahasiswa, terlebih mahasiswa olahraga seperti mahasiswa prodi IKOR. Dengan badan yang bugar maka mahasiswa mampu melakukan kegiatan perkuliahan dengan baik bahkan tanpa hambatan apapun yang berkaitan dengan jasmani. Selain kebugaran, pemanfaatan waktu juga penting bagi mahasiswa. Jika mahasiswa dapat memanfaatkan waktu yang ada dengan baik, dan menggunakan waktu luang yang dimilikinya dengan berolahraga maka kebugaran jasmaninya akan tetap terjaga. Oleh sebab itu peneliti ingin menelitivtentang tingkatakebugaran jasmaniypada mahasiswa prodi IKOR angkatan 2017 dengan kegiatan dalam memanfaatkan waktu luangnya. Tujuan penelitian ini adalah untuk mendeskripsikan tingkat kebugaranajasmaniymahasiswa putra prodi IKOR angkatan 2017 Universitas Negeri Surabaya dalam pemanfaatan waktu terluangnya. Penelitian ini menggunkan metode penelitian deskriptif kuantitatif. Instrumen yang digunakan adalah tes lari berjarak 1600 meter guna mengetahuiitingkat kebugaran jasmaniymahasiswa, serta angket sebagai instrumen untuk mencai tahu tingkat pemanfaatan waktu luang. Sampel pada penelitian ini berjumlah 24 mahasiswa yang diambil dari mahasiswa putra prodi IKOR angkatan 2017 UniversitaseNegeri Surabaya. Berdasar pada hasil penelitian dapat disimpulkan bahwaatingkat kebugaran jasmani mahasiswa putra prodi IKOR angkatan 2017 dikatakan baik, dengan hasil diketahui ada 29.16 % yang masuk dalamakategori “Baik”, 45.84 % masuk kategoriy“Sedang”, dan 25 % masuk kategorii“Kurang”. Sedangkan untuk pemanfaatan waktu luangnya diketahui sebesar 70.84 % masuk dalammkategori baik, 29.16 % masuk dalam kategori cukup, dan 0 % kurang baik. Kata kunci: Tingkat kebugaran jasmani, pemanfaatan waktu, waktu luan

¿Cómo está la democracia? ¿cómo estamos las mujeres?

Este artículo fue presentado por la autora en un conversatorio, organizado por Mujeres por la Democracia-Mude y hace un balance del proceso democrático en el país y la situación y rol de las mujeres en él