The RENO experiment has observed the disappearance of reactor electron antineutrinos, consistent with neutrino oscillations, with a significance of 4.9 standard deviations. Antineutrinos from six 2.8 ... GW(th) reactors at the Yonggwang Nuclear Power Plant in Korea, are detected by two identical detectors located at 294 and 1383 m, respectively, from the reactor array center. In the 229 d data-taking period between 11 August 2011 and 26 March 2012, the far (near) detector observed 17102 (154088) electron antineutrino candidate events with a background fraction of 5.5% (2.7%). The ratio of observed to expected numbers of antineutrinos in the far detector is 0.920±0.009(stat)±0.014(syst). From this deficit, we determine sin(2)2θ(13)=0.113±0.013(stat)±0.019(syst) based on a rate-only analysis.
An experiment to search for light sterile neutrinos is conducted at a reactor with a thermal power of 2.8 GW located at the Hanbit nuclear power complex. The search is done with a detector consisting ...of a ton of Gd-loaded liquid scintillator in a tendon gallery approximately 24 m from the reactor core. The measured antineutrino event rate is 1976 per day with a signal to background ratio of about 22. The shape of the antineutrino energy spectrum obtained from the eight-month data-taking period is compared with a hypothesis of oscillations due to active-sterile antineutrino mixing. No strong evidence of 3+1 neutrino oscillation is found. An excess around the 5 MeV prompt energy range is observed as seen in existing longer-baseline experiments. The mixing parameter sin^{2}2θ_{14} is limited up to less than 0.1 for Δm_{41}^{2} ranging from 0.2 to 2.3 eV^{2} with a 90% confidence level.
The Reactor Experiment for Neutrino Oscillation (RENO) has been taking electron antineutrino (ν¯e) data from the reactors in Yonggwang, Korea, using two identical detectors since August 2011. Using ...roughly 500 live days of data through January 2013 we observe 290 775 (31 514) reactor ν¯e candidate events with 2.8% (4.9%) background in the near (far) detector. The observed visible positron spectra from the reactor ν¯e events in both detectors show a discrepancy around 5 MeV with regard to the prediction from the current reactor ν¯e model. Based on a far-to-near ratio measurement using the spectral and rate information, we have obtained sin22θ13=0.082±0.009(stat.)±0.006(syst.) and |Δmee2|=2.62−0.23+0.21(stat.)−0.13+0.12(syst.)×10−3 eV2.
The recent manufacturing trend toward mass customization and further personalization of products requires factories to be smarter than ever before in order to: (1) quickly respond to customer ...requirements, (2) resiliently retool machinery and adjust operational parameters for unforeseen system failures and product quality problems, and (3) retrofit old systems with upcoming new technologies. Furthermore, product lifecycles are becoming shorter due to unbounded and unpredictable customer requirements, thereby requiring reconfigurable and versatile manufacturing systems that underpin the basic building blocks of smart factories. This study introduces a modular factory testbed, emphasizing transformability and modularity under a distributed shop-floor control architecture. The main technologies and methods, being developed and verified through the testbed, are presented from the four aspects of rapid factory transformation: self-layout recognition, rapid workstation and robot reprogramming, inter-layer information sharing, and configurable software for shop-floor monitoring.
Summary
Background Subungual haemorrhages are characterized by well‐circumscribed dots or blotches with a red to red–black pigmentation, but some cases can be difficult to distinguish from subungual ...melanoma by the naked eye alone. Dermoscopy has proven to be a useful, noninvasive tool in the diagnosis of pigmented lesions in the nail; however, few dermoscopic studies of subungual haemorrhages have been reported.
Objectives To investigate characteristic dermoscopic patterns of subungual haemorrhages, and to find distinctive features that can differentiate them from nail‐unit melanomas.
Methods Patients with a confirmed diagnosis of either subungual haemorrhage or nail‐unit melanoma at a tertiary university hospital were included in the study. Clinical features and dermoscopic patterns were evaluated.
Results Sixty‐four patients with a total of 90 lesions of subungual haemorrhage were enrolled in the study. The majority of cases (84%) showed combinations of more than one colour, while 16% had only one colour. The most common colour of the subungual haemorrhages was purple–black, in 37% of cases. A homogeneous pattern was observed in 92% of cases, globular patterns in 42% and streaks in 39%. Peripheral fading and periungual haemorrhages were found in 54% and 22% of cases, respectively. Destruction or dystrophy of the nail plate was observed in 16% of cases. In the 16 cases of nail‐unit melanomas, Hutchinson sign, longitudinal irregular bands or lines, triangular shape of bands, vascular pattern, and ulcerations were found in 100%, 81%, 25%, 6% and 81% of cases, respectively. In contrast, these features were not found in subungual haemorrhages.
Conclusions Dermoscopy provides valuable information for the diagnosis of subungual haemorrhage and aids in the differential diagnosis from nail‐unit melanoma.
What’s already known about this topic?
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Subungual haemorrhage is a common imitator of subungual melanoma, and thus subungual melanoma should always be included in the differential diagnosis of subungual haemorrhage.
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Dermoscopy is a helpful, noninvasive diagnostic tool that has been reported to improve diagnostic accuracy in pigmented nail lesions.
What does this study add?
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The results of our study show that the characteristic dermoscopic findings of subungual haemorrhage can be summarized as homogeneous patterns, globular patterns, streaks, peripheral fading and periungual haemorrhages.
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This study shows that dermoscopy provides valuable information for the diagnosis of subungual haemorrhages and assists in its differential diagnosis from nail‐unit melanomas.
Onychopapilloma: its clinical, dermoscopic and pathologic features Kim, T.‐R.; Bae, K.‐N.; Son, J.‐H. ...
JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology,
November 2022, 2022-11-00, 20221101, Letnik:
36, Številka:
11
Journal Article
Recenzirano
Odprti dostop
Background
Onychopapilloma is a benign tumour of the nail bed and distal matrix and commonly presents as longitudinal erythronychia, longitudinal leukonychia or longitudinal melanonychia. Because ...onychopapilloma is rare, its clinical characteristics and dermoscopic findings have not been well investigated in Asia.
Objectives
This study aimed to investigate the clinical characteristics and dermoscopic and pathologic findings of onychopapilloma in Korea.
Methods
We retrospectively reviewed the medical records and clinical/dermoscopic photographs of 39 patients diagnosed with onychopapilloma in the Pusan National University Hospitals (Busan and Yangsan) for 11 years (2010–2021).
Results
Among 39 patients, 23 (59.0%) were men, and 16 (41.0%) were women. The mean age was 46.1 (16–77) years. All lesions were single, and most of them were located on the fingers (92.3%), especially the thumb (66.7%). The most common clinical feature was longitudinal erythronychia (56.4%), and the most common dermoscopic finding was distal subungual hyperkeratosis (100%). We found two new dermoscopic features: macrolunula and trailing lunula along the longitudinal band. Among 18 patients who underwent surgical excision, only 6 (33.3%) showed typical acanthosis and papillomatosis on the nail bed.
Conclusions
We found that Asian onychopapilloma has similar clinicodermoscopic findings to the Caucasian one, that is to say, longitudinal erythronychia and distal subungual hyperkeratosis were the most common nail change and dermoscopic finding, respectively. We propose two new dermoscopic features of onychopapilloma: macrolunula and trailing lunula along the longitudinal band.
Summary
Background Psoriasis and seborrhoeic dermatitis are common erythematous‐squamous dermatoses that may present with scaly erythematous patches on the scalp. Owing to the similar ...clinicopathological features of these dermatoses, their differentiation poses a diagnostic challenge, particularly when the lesions on the scalp are isolated.
Objectives To evaluate the usefulness of dermoscopy in the clinical differentiation of scalp psoriasis and seborrhoeic dermatitis.
Methods This was a retrospective observational study to evaluate the characteristic dermoscopic features of scalp psoriasis and seborrhoeic dermatitis. The study included a total of 96 patients with lesions; these patients were recruited from two tertiary teaching hospitals in Korea (Pusan National University Hospital and Kyungpook National University Hospital). Among these, 55 patients had scalp psoriasis and 41 patients had seborrhoeic dermatitis.
Results The most significant dermoscopic features of scalp psoriasis were red dots and globules, twisted red loops, and glomerular vessels. In contrast, seborrhoeic dermatitis was characterized by arborizing vessels and atypical red vessels with the absence of red dots and globules. Featureless areas devoid of any particular vascular patterns were also frequently observed in seborrhoeic dermatitis. Dermoscopic findings of red lines and other vascular patterns were not considered useful for differentiation because these were uncommon features in both diseases. Although scales were observed commonly in both diseases, there was no significant difference in the frequency and characteristics of the scales when they were observed using dermoscopy.
Conclusions Our study shows that the investigation of vascular patterns by using dermoscopy can be valuable for the clinical diagnosis and differentiation of scalp psoriasis and seborrhoeic dermatitis.
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