Firm Behavior and Product Durability

Greg Goering,R. Kelley Pace 서울대학교 경제연구소 1995 Seoul journal of economics Vol.8 No.4

Traditional models of product obsolescence assume firms exhibit specific behavior. The simple two period model developed herein employs a conjectural variation framework to examine the sensitivity of sub-optimal durability within sales markets to behavioral assumptions. Even in sales markets. this model leads to two cases where efficient durability occurs and two cases where inefficient durability occurs.

A Regulatory Science Approach to Assess the Safety of Medical Devices Incorporating Nanotechnology

Peter L. GOERING 한국생물공학회 2019 한국생물공학회 학술대회 Vol.2019 No.10

괴테의 양극성과 조화

외른괴레스 (Joern Goeres) 한국괴테학회 1988 괴테연구 Vol.3 No.-

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Magnetic Behavior of Single-Chain Magnets in Metal Organic Frameworks CPO-27-Co

Son, Kwanghyo,Goering, Eberhard,Hirscher, Michael,Oh, Hyunchul American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.10

<P>Nanoscale molecular magnets of highly porous and crystalline Metal-organic frameworks (MOFs) have attracted increasing interest in recent years because of their potential application in nano-magnetic device or matrices for encapsulating of a large variety of substances. For that, a fundamental understanding of its origin of magnetism in MOFs would be essential and will provide useful insight for intelligent design of their electromagnetic properties (e.g., single-chain magnets, single-ion magnets or single-molecule magnets). Herein, we experimentally investigate the magnetic property of hexagonal 1-D channel MOFs composed of metal(cobalt) cluster connected with organic linker (so-called CPO-27-Co). Through a fundamental physisorption analysis, in-depth magnetic studies by use of superconducting quantum interference device (SQUID) magnetometry, and theoretically by the application of an isotropic Heisenberg Hamiltonian, we found a magnetic configuration of CPO-27-Co exhibiting both a weak ferro-and antiferromagnetism with cobalt magne-tocrystalline anisotropy. Interestingly, when a magnetic configuration of cobalt cluster (instead of ionic cobalt inside cluster of CPO-27) are considered, the inter Co cluster interaction exhibits superparamagnetic behavior while inside of Co cluster (ionic Co-Co interaction) is dominated by a weak ferromagnetic component.</P>

Effect of the soft layer thickness on magnetization reversal process of exchange-spring nanomagnet patterns

손광효,Gisela Schütz,Eberhard Goering 한국물리학회 2020 Current Applied Physics Vol.20 No.4

A systematic study of the magnetization reversal behavior in the regular arrangement of L10-FePt based exchange- spring nanomagnets with different thicknesses of the Co soft magnetic layer is presented. The magnetic property of the hard magnet is compared to two tuned exchange-spring magnets: its systems of 20 nm L10-FePt/ 3 nm, and 7 nm Co. In particular, we focus on the switching field distribution. The exchange coupling showed narrower SFD, in spite of the decoupled part switches earlier. The magnetization switching mechanism of exchange- spring nanomagnets patterns has been revealed with a first-order reversal curves technique and the switching field distribution. Further, the microscopic results using magnetic force microscopy show that the spin rotation of the non-interacting part in the thicker soft layered exchange-spring magnet. The part influences the magnetization reversal process. According to the experimental results, exchange coupling strength can be tuned by the thickness of the soft magnetic layer.

A new species of Bangiopsis: B. franklynottii sp. nov. (Stylonematophyceae, Rhodophyta) from Australia and India and comments on the genus

West, John A.,de Goer, Susan Loiseaux,Zuccarello, Giuseppe C. The Korean Society of Phycology 2014 ALGAE Vol.29 No.2

Small red algae, especially those previously referred to as 'primitive' are often overlooked, but can be quite abundant. These 'primitive' red algae are now placed in several classes distinct from the Florideophyceae, for example the Stylonematophyceae. A brownish-red filamentous alga was collected from a sandy tide pool at Cape Tribulation, Queensland, Australia. Cultured specimens were identified as Bangiopsis and conformed to the morphological characters of the genus (multicellular base, erect filaments branched or unbranched, uniseriate to multiseriate-tubular, single multilobed purple-red to red-brown plastid with central pyrenoid, vegetative cells released directly as spores). Molecular data of two plastid genes (rbcL, psbA) support placement of the Australian isolate and isolates from India in Bangiopsis. The genetic variation between these isolates and isolates from Puerto Rico previously attributed to B. subsimplex indicates that these should be considered as a separate species. As the type locality is in the Atlantic Ocean, French Guiana, and not far from Puerto Rico, and the Puerto Rican isolate has been used often in phylogenetic analyses, we propose that the Indian and Pacific Ocean isolates be designated a new species, B. franklynottii, to acknowledge Ott's many years of research on inconspicuous freshwater and marine red algae. Our research also highlights the lack of careful descriptions in many of the records of this genus and the lack of morphological characters to distinguish species. Especially within the morphologically simple red algae, morphological distinctness does not necessarily reflect evolutionary divergences.

Observations on some mangrove-associated algae from the western Pacific (Guam, Chuuk, Kosrae, and Pohnpei)

West, John A.,Kamiya, Mitsunobu,Loiseaux de Goer, Susan,Karsten, Ulf,Zuccarello, Giuseppe C. The Korean Society of Phycology 2013 ALGAE Vol.28 No.3

The mangrove algal flora of Guam and the Federated States of Micronesia has been poorly explored. We add to our knowledge of this region by observations of collections from these regions. This paper presents new and additional records of: Rhodophyta-Acrochaetium globosum, Colaconema sp., Caulacanthus indicus, Bostrychia moritziana / B. radicans, B. radicosa, B. simpliciuscula, B. kelanensis and B. tenella, Murrayella periclados, and Caloglossa ogasawaraensis; Chlorophyta-Boodleopsis carolinensis; and Phaeophyceae-Dictyota adnata, Dictyotopsis propagulifera, and Canistrocarpus cervicornis. Most specimens were cultured to investigate their reproductive biology and many specimens were further identified using molecular data. Low molecular weight carbohydrates (dulcitol, sorbitol, and digeneaside) were identified in samples of B. radicosa and B. simpliciuscula. We also present data on manganese-rich deposits found on B. simpliciuscula and B. tenella in culture, possibly formed by epiphytic bacteria.

Local affordable housing dynamics in two global cities: patterns and possible lessons?

Christine M. E. Whitehead,John Goering 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.1

This paper compares how New York and London, two major global cities, have developed policies and programmes to help ensure affordable housing for their citizens. It clarifies how, starting from relatively limited local regulatory powers in the nineteenth century, each city has used local resources as well as centrally authorized programmes, to create unique mixes of rental housing support, mostly based on instruments that enable sub-market rents. It goes on to discuss how the legacies arising from these interventions, both positive and negative, have influenced affordability in these cities’ current, more internationally open and generally more privatized, housing systems. The relative success of both cities has depended on the management of this pastiche of programmes and financing. Even so, while large proportions of lower income households in both cities (although larger in London) are assisted, there remains significant, and, in current economic circumstances, potentially growing numbers of households, facing unaffordable market rents. In the foreseeable future it can only be an amalgam of these local and nationally supported policies together with local initiatives that can help limit, although not resolve, the continuing problems of ensuring adequate affordable homes for lower income households in both New York and London.

Monosiphonous growth and cell-death in an unusual Bostrychia (Rhodomelaceae, Rhodophyta): B. anomala sp. nov.

West, John A.,Loiseaux de Goer, Susan,Zuccarello, Giuseppe C. The Korean Society of Phycology 2013 ALGAE Vol.28 No.2

A morphologically distinct lineage within the Bostrychia moritziana-B. radicans species complex is described as a new species. Bostrychia anomala has thalli with branched monosiphonous filaments with apical cell divisions. The species has terminal tetrasporangial stichidia, each subtending cell bearing tetrasporangia with 2 cover cells. Discharged spores divide transversely, the lower cell first forming a narrow rhizoid and the upper cell forming a monosiphonous shoot. Females have subterminal procarps and males have terminal spermatangial stichidia. Carposporophytes are spherical. Isolates in culture show a pattern of cell death not associated with injury, reminiscent of programmed cell death. Bostrychia anomola shows cell death at intervals along the filaments resulting in division of adjacent cells on either side of the dead cell re-joining the filament; cell division of only one adjacent cell resulting in branching at that site; or filaments fragmenting at the cell death point with adjacent cells forming new apical cells, a means of thallus propagation. The cell death pattern could be a method of filament propagation in the mangrove environment where sexual reproduction is rare.

Lemanea manipurensis sp. nov. (Batrachospermales), a freshwater red algal species from North-East India

Ganesan, E.K.,West, J.A.,Zuccarello, G.C.,de Goer, S. Loiseaux,Rout, J. The Korean Society of Phycology 2015 ALGAE Vol.30 No.1

A new macroscopic riverine red algal species, Lemanea manipurensis sp. nov. (Batrachospermales) is described from Manipur in northeast India. It has a sparsely branched, pseudoparenchymatous thallus with a single, central axial filament that lacks cortical filaments. Spermatangia occur generally in isolated, low and indistinct patches or form an almost continuous ring around the axis. Carposporophytes project into the hollow thallus cavity without an ostiole. The most striking morphological feature is the carposporophyte with very short gonimoblast filaments having cylindrical, narrow and sparsely branched sterile filaments, the terminal cell of each branch with a single, large, elongate carpospore. The widely distributed L. fluviatilis has spherical carpospores in long branched chains. Phylogenetic analysis of rbcL sequence data and comparison with other Batrachospermales clearly show that our specimens do not align with other species of Lemanea and Paralemanea investigated thus far. Five specific names attributed in previous literature (1973-2014) to Lemanea from Manipur, L. australis, L. catenata, L. fluviatilis, L. mamillosa, and L. torulosa are rejected until critical anatomical and molecular evidence is available for specimens from the Manipur river systems. Taxa referable to Paralemanea were not confirmed for India in this study. In view of the high demand for food and medical uses of L. manipurensis in northeast India, conservation measures are needed for its long term survival. The present paper constitutes the first combined morphological / molecular study on a freshwater red alga from India.