Showing papers by "Stanford University published in 1974"

The measurement of psychological androgyny.

Abstract: This article describes the development of a new sex-role inventory that treats masculinity and femininity as two independent dimensions, thereby making it possible to characterize a person as masculine, feminine, or "androgynous" as a function of the difference between his or her endorsement of masculine and feminine personality characteristics. Normative data are presented, as well as the results of various psychometric analyses. The major findings of conceptual interest are: (a) the dimensions of masculinity and femininity are empirically as well as logically independent; (6) the concept of psychological androgyny is a reliable one; and (c) highly sex-typed scores do not reflect a general tendency to respond in a socially desirable direction, but rather a specific tendency to describe oneself in accordance with sex-typed standards of desirable behavior for men and women. Both in psychology and in society at large, masculinity and femininity have long been conceptualized as bipolar ends of a single continuum; accordingly, a person has had to be either masculine or feminine, but not both. This sex-role dichotomy has served to obscure two very plausible hypotheses: first, that many individuals might be "androgynous" ; that is, they might be both masculine and feminine, both assertive and yielding, both instrumental and expressive—depending on the situational appropriateness of these various behaviors; and conversely, that strongly sex-typed individuals might be seriously limited in the range of behaviors available to them as they move from situation to situation. According to both Kagan (1964) and Kohlberg (1966), the highly sex-typed individual is motivated to keep his behavior consistent with an internalized sex-role standard, a goal that he presumably accomplishes by suppressing any behavior that might be con

Quad trees a data structure for retrieval on composite keys

Abstract: The quad tree is a data structure appropriate for storing information to be retrieved on composite keys. We discuss the specific case of two-dimensional retrieval, although the structure is easily generalised to arbitrary dimensions. Algorithms are given both for staightforward insertion and for a type of balanced insertion into quad trees. Empirical analyses show that the average time for insertion is logarithmic with the tree size. An algorithm for retrieval within regions is presented along with data from empirical studies which imply that searching is reasonably efficient. We define an optimized tree and present an algorithm to accomplish optimization in n log n time. Searching is guaranteed to be fast in optimized trees. Remaining problems include those of deletion from quad trees and merging of quad trees, which seem to be inherently difficult operations.

A Projection Pursuit Algorithm for Exploratory Data Analysis

Abstract: An algorithm for the analysis of multivariate data is presented and is discussed in terms of specific examples. The algorithm seeks to find one-and two-dimensional linear projections of multivariate data that are relatively highly revealing.

The jackknife-a review

Abstract: SUMMARY Research on the jackknife technique since its introduction by Quenouille and Tukey is reviewed. Both its role in bias reduction and in robust interval estimation are treated. Some speculations and suggestions about future research are made. The bibliography attempts to include all published work on jackknife methodology.

On predicting some of the people some of the time: the search for cross-situational consistencies in behavior

Abstract: The historically recurring controversy over the existence of cross-situational consistencies in behavior is sustained by the discrepancy between our intuitions, which affirm their existence, and the research literature, which does not. It is argued that the nomothetic assumptions of the traditional research paradigm are incorrect and that by adopting some of the idiographic assumptions employed by our intuitions, higher cross-situational correlation coefficients can be obtained. A study is reported which shows that it is possible to identify on a priori grounds those individuals who will be crosssituationally consistent and those who will not, and it is concluded that not only must personality assessment attend to situations—as has been recently urged—but to persons as well.

The Optimal Depletion of Exhaustible Resources

Abstract: 0.1. In any given economy there must be a number of commodities that enter into production and which are used up, and whose available stock cannot be increased. Examples like fossil fuels come readily to mind. It would seem reasonable to argue that in the long run the limited availability of these commodities, together with their technological importance, would begin to act as a constraint on the economy's growth potential. In fact several recent studies have laid great emphasis on this possibility.3 Although the point is an obvious one, most economic studies of the properties of long-run plans neglect it.4 In this paper, therefore, we explore in a rather preliminary way the problems that appear to arise naturally when the existence of exhaustible resources is incorporated into the study of intertemporal plans. It appears that questions in this area are hard to answer. For even in the simplest of environments where it is supposed that there is perfect foresight, one is concerned not merely with the optimal depletion of exhaustible resources but with the optimal rate of investment as well. The two must plainly be interrelated. The latter problem on its own is hard, and the combined problem is very complex. In fact it will appear in the course of the arguments that follow that intuition is not a very good guide for this joint problem. In any case, the assumption of perfect foresight is particularly dubious here since it would appear almost immediate that an investigation of intertemporal plans in the presence of exhaustible resources readily invites consideration of the possibilities of large-scale alterations in technology at dates in the future that are inherently uncertain. Moreover, it is clear that such extensive technological changes would not be achievable costlessly. In this paper, therefore, we attempt to demonstrate how one might, in a relatively simple manner, bring such considerations as these to bear on a set of questions that have generated a considerable amount of interest in recent years. 0.2. It is plain of course that the mere existence of a resource that is exhaustible is not a

Discovery of a Narrow Resonance in $e^+ e^-$ Annihilation

Abstract: We have observed a very sharp peak in the cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{hadrons}, {e}^{+}{e}^{\ensuremath{-}}$, and possibly ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ at a center-of-mass energy of 3105\ifmmode\pm\else\textpm\fi{}0003 GeV The upper limit to the full width at half-maximum is 13 MeV

Why Not Diversify Internationally Rather Than Domestically

Abstract: Because total risk for a portfolio declines not only with the number of securities included but with the degree of independence among these securities, substantial risk reduction results from diversifying a portfolio across foreign as well as domestic common stocks.

A Protocol for Packet Network Intercommunication

Abstract: A protocol that supports the sharing of resources that exist in different packet switching networks is presented. The protocol provides for variation in individual network packet sizes, transmission failures, sequencing, flow control, end-to-end error checking, and the creation and destruction of logical process-to-process connections. Some implementation issues are considered, and problems such as internetwork routing, accounting, and timeouts are exposed.

A Characterization of Ten Hidden-Surface Algorithms

Abstract: : The paper asserts that the hidden-surface problem is mainly one of sorting. The various surfaces of an object to be shown in hidden-surface or hidden-line form must be sorted to find out which ones are visible at various places on the screen. Surfaces may be sorted by lateral position in the picture (XY), by depth (Z), or by other criteria. The paper shows that the order of sorting and the types of sorting used form differences among the existing hidden-surface algorithms. (Modified author abstract)

Transformation of Salmonella typhimurium by Plasmid Deoxyribonucleic Acid

Abstract: A modified transformation procedure that is effective for the introduction of plasmid deoxyribonucleic acid at high frequency into Salmonella typhimurium, as well as into Escherichia coli, is described. Transformed bacteria acquire a circular deoxyribonucleic acid species having the genetic and molecular characteristics of the transforming plasmid.

Universal reagent 2-site immunoradiometric assay using labelled anti (IgG)

Abstract: An improvement is made in 2-site immunoradiometric assay wherein a single labelled antibody can be used to assay many different antigens.

Processes in Delay of Gratification

Abstract: Publisher Summary This chapter provides an overview of research on choice preferences for delayed, larger versus immediate, smaller gratifications. In spite of the widespread recognition of the important role of delay of gratification in human affairs, previous experimental research on the topic has been limited. At the empirical level, extensive experimental work has been done on delay of reward in animals. Surprisingly, although voluntary delay behavior has been assumed to be a critical component of such concepts as “ego strength,” “impulse control,” and “internalization,” prior to the present research program relatively little systematic attention had been devoted to it in empirical work on human social behavior. The chapter presents, in greater detail, selected studies that focus on the role of cognitive processes during self-imposed delay. Many theorists have paid tribute abstractly to the importance of cognition for the phenomena of personality in general and for self-regulatory processes in particular. These tributes have been accompanied by some correlational research that explores, for example, the links between intelligence, self-control, cognitive styles, and other dispositional. The chapter offers a further theoretical analysis of the determinants of delay behavior.

A view of three decades of linear filtering theory

Abstract: Developments in the theory of linear least-squares estimation in the last thirty years or so are outlined. Particular attention is paid to early mathematica[ work in the field and to more modern developments showing some of the many connections between least-squares filtering and other fields.

Fluorescent immunoassay employing total reflection for activation

Abstract: Receptors are employed to which one or more fluroescent molecules are bound. When the receptors are bound to the epitopic sites on the surface and light of predetermined wave length is directed toward the surface, the fluorescing molecules are activated and fluoresce. In carrying out an assay, receptor is combined with an unknown suspected of containing molecules having the same epitopic sites bound to the surface. The receptor will bind to these molecules reducing the number of receptor sites available for binding to the epitopic sites on the surface. When the assay medium is contacted with the surface, the amount of receptor which binds to the surface, will be a function of available binding sites and, therefore, to the number of the molecules present in the unknown. Upon irradiation of the surface, substantially only the fluoroescent molecules bound to the surface will fluoresce. By monitoring the fluorescence, one can determine the presence and number of molecules of interest present in the unknown. The apparatus consists of a transparent solid sheet, conveniently as part of or optically connected to a prism, a light source set at an angle to provide total internal reflection at the sheet, a cell which includes the reflecting surface as a wall, and a fluorescence detector. Various optics and filters may be employed to modify the light source beam and the fluorescence beam. This work was carried out under a grant of the National Science Foundation.

On being sane in insane places

Abstract: It is clear that we cannot distinguish the sane from the insane in psychiatric hospitals. The hospital itself imposes a special environment in which the meanings of behavior can easily be misunderstood. The consequences to patients hospitalized in such an environment-the powerlessness, depersonalization, segregation, mortification, and self-labeling-seem undoubtedly countertherapeutic. I do not, even now, understand this problem well enough to perceive solutions. But two matters seem to have some promise. The first concerns the proliferation of community mental health facilities, of crisis intervention centers, of the human potential movement, and of behavior therapies that, for all of their own problems, tend to avoid psychiatric labels, to focus on specific problems and behaviors, and to retain the individual in a relatively non-pejorative environment. Clearly, to the extent that we refrain from sending the distressed to insane places, our impressions of them are less likely to be distorted. (The risk of distorted perceptions, it seems to me, is always present, since we are much more sensitive to an individual's behaviors and verbalizations than we are to the subtle contextual stimuli that often promote them. At issue here is a matter of magnitude. And, as I have shown, the magnitude of distortion is exceedingly high in the extreme context that is a psychiatric hospital.) The second matter that might prove promising speaks to the need to increase the sensitivity of mental health workers and researchers to the Catch 22 position of psychiatric patients. Simply reading materials in this area will be of help to some such workers and researchers. For others, directly experiencing the impact of psychiatric hospitalization will be of enormous use. Clearly, further research into the social psychology of such total institutions will both facilitate treatment and deepen understanding. I and the other pseudopatients in the psychiatric setting had distinctly negative reactions. We do not pretend to describe the subjective experiences of true patients. Theirs may be different from ours, particularly with the passage of time and the necessary process of adaptation to one's environment. But we can and do speak to the relatively more objective indices of treatment within the hospital. It could be a mistake, and a very unfortunate one, to consider that what happened to us derived from malice or stupidity on the part of the staff. Quite the contrary, our overwhelming impression of them was of people who really cared, who were committed and who were uncommonly intelligent. Where they failed, as they sometimes did painfully, it would be more accurate to attribute those failures to the environment in which they, too, found themselves than to personal callousness. Their perceptions and behavior were controlled by the situation, rather than being motivated by a malicious disposition. In a more benign environment, one that was less attached to global diagnosis, their behaviors and judgments might have been more benign and effective.

Structured Programming with go to Statements

Abstract: A consideration of several different examples sheds new light on the problem of ereating reliable, well-structured programs that behave efficiently. This study focuses largely on two issues: (a) improved syntax for iterations and error exits, making it possible to write a larger class of programs clearly and efficiently without go to statements; (b) a methodology of program design, beginning with readable and correct, but possibly inefficient programs that are systematically transformed if necessary into efficient and correct, but possibly less readable code. The discussion brings out opposing points of view about whether or not go to statements should be abolished; some merit is found on both sides of this question. Fina!ly, an attempt is made to define the true nature of structured programming, and to recommend fruitful directions for further study.

DNA Ligase: Structure, Mechanism, and Function

Abstract: DNA ligase of E. coli is a polypeptide of molecular weight 75,000. The comparable T4-induced enzyme is somewhat smaller (63,000 to 68,000). Both enzymes catalyze the synthesis of phosphodiester bonds between adjacent 5'-phosphoryl and 3'-hydroxyl groups in nicked duplex DNA, coupled to the cleavage of the pyrophosphate bond of DPN (E. coli) or ATP (T4). Phosphodiester bond synthesis catalyzed by both enzymes occurs in a series of these discrete steps and involves the participation of two covalent intermediates (Fig. 1). A steady state kinetic analysis of the reaction-catalyzed E. coli ligase supports this mechanism, and further demonstrates that enzyme-adenylate and DNA-adenylate are kinetically significant intermediates on the direct path of phosphodiester bond synthesis. A strain of E. coli with a mutation in the structural gene for DNA ligase which results in the synthesis of an abnormally thermolabile enzyme is inviable at 42 degrees C. Although able to grow at 30 degrees C, the mutant is still defective at this temperature in its ability to repair damage to its DNA caused by ultraviolet irradiation and by alkylating agents. At 42 degrees C, all the newly replicated DNA is in the form of short 10S "Okazaki fragments," an indication that the reason for the mutant's failure to survive under these conditions is its inability to sustain the ligation step that is essential for the discontinuous synthesis of the E. coli chromosome. DNA ligase is therefore an essential enzyme required for normal DNA replication and repair in E. coli. Purified DNA ligases have proved to be useful reagents in the construction in vitro of recombinant DNA molecules.

Pair Production and Bremsstrahlung of Charged Leptons

Abstract: Photo pair productions of electrons, muons, and heavy leptons and bremsstrahlung of electrons and muons are reviewed. Atomic and nuclear form factors necessary for these calculations are discussed. Straggling of electrons in matter and other effects due to finite target thickness are considered. Tables of radiation lengths of all materials and the energy dependence of photon absorption coefficients of many materials are presented. Problems associated with production of particles by photon and electron beams are also discussed.