Biography:

In the past Chun-Hsiang Chang has collaborated on articles with Hong-Xi Tsao and Keiichi Takahashi. One of their most recent publications is Passively gain-switched and self mode-locked thulium fiber laser at 1950 nm. Which was published in journal Optics & Laser Technology.

More information about Chun-Hsiang Chang research including statistics on their citations can be found on their Copernicus Academic profile page.

Chun-Hsiang Chang's Articles: (6)

Passively gain-switched and self mode-locked thulium fiber laser at 1950 nm

Highlights•A CW-pumped, passively gain-switched and self-mode-locked Tm3+ laser is proposed.•A Tm3+ fiber was the gain medium and saturable absorber in the coupled resonators.•2 μm self mode-locking in Tm3+ pumped at 1.57 μm was for the first time observed.•Self mode-locked pulsing at 1950 nm with a peak power of 250 W was achieved.

The chronological record of the woolly mammoth (Mammuthus primigenius) in Japan, and its temporary replacement by Palaeoloxodon naumanni during MIS 3 in Hokkaido (northern Japan)

AbstractThe chronological record of the woolly mammoth (Mammuthus primigenius) in Japan is reevaluated on the basis of new and previously published radiocarbon dates obtained from 9 of the 11 known specimens. The dates range from 45,110 ± 480 to 16,320 ± 90 years BP. However, the exact provenance of the youngest specimen, from Yubari, is unknown. Excluding this specimen, woolly mammoths appear to have been present in Japan from around 45 ka to 20 ka, although perhaps not continuously. Remains of Naumann's elephant Palaeoloxodon naumanni, from Yubetsu, eastern Hokkaido, gave a radiocarbon date of 30,520 ± 220 years BP. Since this species was adapted to temperate forests, and previous pollen analysis indicated there was a slight climate amelioration from about 34 ka to 26 ka (correlated with MIS 3), it is probable that P. naumanni temporarily displaced M. primigenius during this period in Hokkaido.

First discovery of colobine fossils from the early to middle Pleistocene of southern Taiwan

AbstractHere we report on two kinds of cercopithecid fossil monkeys (Cercopithecinae and Colobinae) from the early to middle Pleistocene sediments of the Chochen (=Tsochen) area (Tsailiao-chi or Shinhua Hill), southern Taiwan. The fossil specimens include the first fossil record of colobine monkeys from Taiwan, where only macaque monkeys now occur. All cercopithecine fossils were identified as Macaca cf. Macaca cyclopis, the extant Taiwan macaque, except for one extremely large isolated upper molar, which may belong to another macaque species. On the other hand, all colobine specimens fall within the size variation of extant and extinct Rhinopithecus, but its specific status cannot be determined because of the scantiness of the fossil material. In Taiwan, Rhinopithecus presumably became extinct in the late Pleistocene, probably owing to global cooling and vegetation change, whereas macaques, which are of almost the same body size as Rhinopithecus, survived as M. cyclopis to the present. The contrasting history of survival between the two kinds of monkeys may be due to ecological/behavioral differences between them or as a result of accidental events that occurred in the Pleistocene of Taiwan.

Caloric and vestibular evoked myogenic potential tests in evaluating children with benign paroxysmal vertigo

SummaryObjectiveThis study applied caloric and vestibular evoked myogenic potential (VEMP) tests to evaluate whether children with benign paroxysmal vertigo (BPV) shares similar vestibular features with basilar type migraine.MethodsTwenty subjects of each group including healthy and BPV children were enrolled in this study. Each subject underwent audiometry, caloric and VEMP tests. Diagnosis of BPV was based on the International Classification of Headache Disorder, second edition.ResultsAll BPV children had normal hearing, bilaterally. Caloric test revealed normal responses in 13 patients and abnormal responses in 7 patients (35%). VEMP test showed 50% abnormality in BPV children, including absent and delayed responses. However, when results of caloric and VEMP testing were considered together, 70% of BPV children had abnormality, exhibiting non-significant difference compared with 75% abnormality in basilar type migraine.ConclusionsA combination of caloric and VEMP results reveals higher abnormality (70%) in BPV children, sharing similar features with basilar type migraine in adults, given the similarity of the two disorders. Thus, caloric and VEMP tests may serve as supplementary diagnostic tools in evaluating children with BPV.

The earliest fossil record of the bandicoot rat (Bandicota indica) from the early Middle Pleistocene of Taiwan with discussion on the Quaternary history of the species

AbstractThree molar fossils of murine rodents were newly discovered from an outcrop in the Tsailiao area of Tainan City, ROC. They were dated to the early Middle Pleistocene (ca. 0.7 Ma) based on the stratigraphic and chronological data for the layers distributed at and around the outcrop. A detailed systematic analysis of the fossils reliably referred them to Bandicota indica. This species is now distributed widely in the Oriental Region, including Taiwan, where it usually lives in human-associated environments. Therefore, it is generally believed that this species was introduced artificially into Taiwan very recently. However, the fossils demonstrate that B. indica inhabited Taiwan in the early Middle Pleistocene. They also imply that this species has inhabited Taiwan continuously since the early Middle Pleistocene, although this inference must be tested with nonmorphological methods. The literature on the fossil record of Bandicota was examined to understand its chronospatial distribution throughout the Oriental Region, and indicates that the fossils from the Tsailiao area represent the earliest record of B. indica. The history of the species is discussed on the basis of these data.

Original ArticleClinical and nutritional outcome of pediatric esophageal stenosis with endoscopic balloon dilatation

AbstractAimThe present study evaluates the long-term clinical and nutritional effect to endoscopic balloon dilatation (EBD) in pediatric esophageal stricture.MethodsThis was a 15-year retrospective study involving pediatric patients with esophageal stricture treated with EBD. Outcome parameters included the number of dilatations, procedural success rates, nutritional status, and complications. EBD was performed in patients with a dysphagia score greater than 2. The nutritional status was assessed by weight-for-age z-score. Clinical success was defined as no requirement for EBD for at least 1 year and/or increasing interval between dilatation and the numbers of EBD was fewer than 4 times per year.ResultsA total of 50 cases (mean age, 4.41 ± 4.9 years) were enrolled. During a mean follow-up of 3.2 ± 1.9 years, a total of 268 EBD sessions were performed, with an average of 5.36 sessions per patient (range, 1–33). Patients who had short segment stricture (<2 cm) were prone to achieve clinical success after EBD (p = 0.0094). Procedural perforation rate is 2.6% (7/268); subsequent tracheoesophageal fistula occurred in two patients. The clinical success rate of EBD therapy was 72% (36/50).All had increments of weight-for-age z-score after EBD therapy, and the increment was significantly greater in those patients with short segment stricture or stricture in the middle esophagus at 12 months (p = 0.01 and 0.008, respectively).ConclusionsEBD has good long-term clinical success and nutritional promotion in pediatric patients with esophageal stricture, especially in short segment stricture or stricture in the middle esophagus.

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