Myoung-Seok Kim

A practical MMSE-ML detector for a MIMO SC-FDMA system

We propose a new minimum mean square error (MMSE) based maximum likelihood (ML) detector for a single carrier frequency division multiple access system. By utilizing the distance between decision line and MMSE soft-output, the proposed detector reduces the resources required to check superfluously accurate reliability of received symbol. The proposed detector provides almost same bit error rate with the conventional MMSE-ML detector while requiring significantly low computational complexity (below 10%) as SNR varies.

Recessive dystrophic epidermolysis bullosa associated with dilated cardiomyopathy.

congenital FM. The patient was treated with mild-potency topical corticosteroids and, after 2 months, we observed a resolution of the lesion. Follicular mucinosis is an epithelial reaction pattern characterized by the accumulation of mucin within hair follicles. After the initial report by Pinkus, several publications proposed the existence of two main types of FM. The first type of FM (type I FM) occurs mostly in children and young adults, in the absence of cutaneous or extracutaneous disorders, and shows localized lesions with a tendency to resolve within 2 months to 2 years. The second type (type II FM) occurs in older patients and is associated with mycosis fungoides or Sézary syndrome. Follicular mucinosis is rare in the paediatric population. Most of the cases have a benign prognosis, and undergo a spontaneous resolution. However, cases have been reported in association with Hodgkin disease, other lymphomas and leukaemias. In our case, the favourable evolution under local corticosteroid therapy and the absence of recurrence after 6 months of follow-up favours type I FM. However, we cannot be sure that this evolution has been induced by corticosteroids; it also could be a spontaneous resolution. Nevertheless, a clinical follow-up is still ongoing as malignancies have also been associated with paediatric cases of FM and there are no clear-cut criteria to initially differentiate type I from type II FM. To the best of our knowledge, this is the first reported case of congenital follicular mucinosis.

COL7A1 mutational analysis in Korean patients with dystrophic epidermolysis bullosa

Dystrophic epidermolysis bullosa (DEB) is an inherited blistering skin disorder, characterized by mucocutaneous blistering, scarring and nail dystrophy following minor trauma. DEB is caused by mutations in the COL7A1 gene and occurs either as an autosomal dominant (DDEB, MIM 131750) or as a recessive (RDEB, MIM 226600) trait. The phenotypic variability results from the different types of mutations in COL7A1 and their positions within the gene. In most cases, RDEB has a more severe clinical presentation. The most severe type of DEB, the recessive Hallopeau–Siemens variant (HS-RDEB), is caused by the presence of mutations that lead to premature termination codons (PTCs) in both alleles, whereas the autosomal dominant cases are frequently caused by heterozygous glycine substitutions (GSs) within the collagenous triple helix. To date, more than 500 different mutations of COL7A1 have been reported. In this study, mutational analysis was performed in 18 distinct Korean families with DEB, and a computational study of each mutation was carried out.

An adaptive modulation algorithm for performance improvement of MIMO ML systems

In this letter, we propose a simplified adaptive modulation algorithm for a multiple input multiple output (MIMO) system with a maximum likelihood (ML) receiver to minimize BER under a fixed data rate. The proposed algorithm has the advantages of good system performance and low computational complexity, when compared to previous algorithms.

Channel-Based Multi-Dimensional Set Partitioning for MIMO Reduced-State Sequence Estimation

A multi-dimensional set partitioning (MDSP) is proposed for reduced-state sequence estimation of multi-path fading multiple input multiple output (MIMO) channels. The proposed MDSP takes channel state information into account when making a set partition because MIMO channels change the distance between symbol vectors in a multi-dimensional constellation. To reduce complexity of the proposed MDSP, we propose an efficient MDSP algorithm which exploits only typical error vectors for partitioning.