Jørgen Nielsen

Silos. Fundamentals of theory, behaviour and design

Foreword Part 1: Silo Flow. Part 2: Concrete Structures. Part 3: Metal Structures. Part 4: Numerical simulation of particulate solids. Part 5: Silo Tests. Part 6: Experimental Techniques. Part 7: Research for Industry. Index.

Experience from the first ACT programme in Denmark. II. Severe mental illness. A register diagnosis.

Community psychiatry in Denmark has been criticized because of drop-outs of the patients with severe mental illness. In order to deal with these problems, the first Assertive Community Treatment (ACT) project in Denmark was started in the Tønder region on 1 May 2001. Before starting the clinical study, an epidemiological analysis of severe mental illness was performed. Severe mental illness was defined from register data on the basis of psychosis and high use of psychiatric services. Data concerning drop-out (inactive during a period), death and address were obtained. The point prevalence rate of severe mental illness on 31 December 2000 in Sønderjylland (SJ) county was 1.31/1000. The rate of inactive patients was 0.28/1000. The rates were distributed inhomogeneously between regions. In a 4-year cohort, half of the patients were inactive at least once. The Tønder and Aabenraa regions had homogeneous patterns. In conclusion, the register diagnosis is a target group for ACT. The register diagnosis and the status active/inactive may be used as an unbiased effect parameter.

Experience from the first ACT programme in Denmark. I. Baseline evaluation 1981-2000

: In 1999, a Danish expert report strongly recommended the Assertive Community Treatment (ACT) model to be implemented in Denmark. On 1 May 2001 we started in the Tonder region (45,000 inhabitants), Sonderjylland (SJ) county (254,000 inhabitants), aiming an evaluation of the ACT model. Before starting the clinical study, an epidemiological baseline evaluation of trends in psychiatric service was performed. Data included all admissions to mental hospitals/wards from 1981 to 2000 from the intervention/control region (Tonder/Aabenraa) and from all Denmark together with outpatient data from the period 1995-2000. The bed rate in the SJ county (76/100,000 31 December 2000) was halved during the period. The staff increased by more than 50%. The increase in admission rate and decrease in bed days per admission showed homogeneous pattern between intervention and control region. The hospital incidence of schizophrenia and the first-time admission rate were at the same level in the intervention/control region and all Denmark, but the country had a higher use of beds. The point prevalence and referral rates of outpatients increased to around 6/1000 and 7/1000/year, respectively in both regions. In conclusion, the regions of intervention and control had, prior to the start of ACT, the same pattern of use of psychiatric services, enabling an unbiased register-based evaluation of effects.

Multiuser MIMO: Principle, Performance in Measured Channels and Applicable Service

The exploitation of multiuser diversity and the application of multiple antennas at transmitter and receiver are considered to be key technologies for future highly bandwidth-efficient wireless systems. We combine both ideas in a downlink multicarrier transmission scheme where multiple users compete for the available resources in time, frequency and space. The instantaneous channel impulse responses for all users are assumed to be perfectly known at the transmitter. Our proposed algorithm allocates each spatial dimension on a subcarrier to the user which has the highest channel tap gain on the respective spatial dimension. The scheduling strategy is optimized for sum capacity maximization. In this paper, we restrict ourselves to a more illustrative description of the idea rather then providing mathematical details. We demonstrate the potential of the proposed scheme by capacity results for measured real world channels in a large office environment. Finally, video streaming is used as a potential application with high data rate and low latency demands. It is shown that the proposed method has the potential to exploit multiuser diversity while still providing stable video streams even though QoS constraints are not explicitly taken into account by the scheduler.

On the definition of design values for loads on silos and tanks

Silos and tanks are both industrial storage containers, so it may be imagined that they can be treated in a common manner for structural design. However, the statistical base of reliability theory shows that tanks are exceptionally invariant in their loading, while loads in silos are possibly the most unpredictable of all structural engineering loads. This article sets out the arguments why the statistical scatter of loads on tanks should be seen as very small indeed. It then treats the problems of loads on silos at length, showing that a wide range of different factors dramatically influence the safety of the structure, leading to a situation in which the use of a single value for the partial factor on stored solid loads could be either very uneconomic or else unsafe. It shows that the known key parameters that define the form of the structure, the aspect ratio, the properties of the stored solids, the manner of filling and discharge, and the frequency of usage of the silo should all play a strong role in determining appropriate values of design partial factors. The recommended values for the partial factors should therefore be evaluated using rules placed in EN 1991-4.

Experience from the first ACT-programme in Denmark. I. Baseline evaluation

In 1999, a Danish expert report strongly recommended the Assertive Community Treatment (ACT) model to be implemented in Denmark. On 1 May 2001 we started in the Tønder region (45,000 inhabitants), Sønderjylland (SJ) county (254,000 inhabitants), aiming an evaluation of the ACT model. Before starting the clinical study, an epidemiological baseline evaluation of trends in psychiatric service was performed. Data included all admissions to mental hospitals/wards from 1981 to 2000 from the intervention/control region (Tønder/Aabenraa) and from all Denmark together with outpatient data from the period 1995-2000. The bed rate in the SJ county (76/100,000 31 December 2000) was halved during the period. The staff increased by more than 50%. The increase in admission rate and decrease in bed days per admission showed homogeneous pattern between intervention and control region. The hospital incidence of schizophrenia and the first-time admission rate were at the same level in the intervention/control region and all Denmark, but the country had a higher use of beds. The point prevalence and referral rates of outpatients increased to around 6/1000 and 7/1000/year, respectively in both regions. In conclusion, the regions of intervention and control had, prior to the start of ACT, the same pattern of use of psychiatric services, enabling an unbiased register-based evaluation of effects.

Information system structure for a task level robot assembly language for on-line program generation

Abstract The increasing industrial need for production automation in one of a kind production and increasing demand for one of a kind or small batch production requires that automation is carried out by programmable automatic equipment in order to ensure that this equipment can be rapidly and easily adjusted and configured to the ever changing production tasks. In order that the adjustment and reconfiguration of the production equipment can be carried out quickly, reliably and in compatibility with the state of the production plant at the time of task execution it is necessary that the equipment tasks can be specified by a specification language, which is much more abstract than the task specification languages that are today commercially available for machine tool and robot programming, and that the corresponding compiler can be controlled by the system controlling the sequence of operations of the assembly plant. To comply with this need a task level robot programming language for assembly operations has been developed with a level of abstraction corresponding to the level of abstraction for the command: Mount part A. The compiler of the language retrieves information about placement and orientation of the parts to be assembled from a database. The information is supplied to the database by proper sensors mounted on the assembly plant, implying that the program which is generated corresponds to the state of the physical plant at program execution time. Additionally, making available information of permitted production assembly sequences has enabled the compiler to be controlled by a system that optimizes the sequence in which a particular assembly should be carried out respecting present availability of resources needed for the assembling tasks. In this paper the designed robot language, the corresponding compiler and the necessary information structures are presented.

Hypokonder paranoia Opfølgning af en kasuistik

Artiklen omhandler opfolgning af en kasuistik om hypkonder paranoia, der forste gang blev bragt i Nordisk Psykiatrisk Tidsskrift 1966 af N. J. Thomsen og N. Juel-Nielsen. Disse har gennemlzst hervaerende publikation og har haft lejlighed til at fremsztte kommentarer hertil. De har begge tilsluttet sig diskussionen og den nu dragne konklusion.Forfatterne har begge arbejdet pa psykiatrisk hospital i Arhus og arbejder nu henholdsvis som 1. reservelzge pa psykiatrisk afdeling ved Rigshospitalet og 1. reservelaege pa institut for psykiatrisk demografi i Arhus.