Today's explosive demand for data transfer is accelerating the development of non-volatile memory with even larger capacity and cheaper cost. Since the introduction of 3D technology in 2014 [1], V-NAND is believed to be a successful alternative to planar NAND and is quickly displacing planar NAND in the SSD market, due to its performance, reliability, and cost competitiveness. V-NAND has also eliminated the cell-to-cell interference problem by forming an atomic layer for charge trapping [2], which enables further technology scaling. However, the etching technology required for creating a channel hole cannot keep up with the market-driven WL stack requirement. Therefore, total mold height reduction is unavoidable and this creates several problems. 1) reduced mold height increases resistance and capacitance for WLs due to the thinner layers being used. 2) channel hole critical dimension (CD) variation becomes problematic because the additional mold stack height aggravates uniformity, thereby producing WL resistance variation. Consequently, read and program performance degradation is inevitable, furthermore their optimization becomes more challenging.

Simple theoretical interpretation has been made on the previously reported odd-even behavior of the emergence of ferroelectricity and antiferroelectricity in homologous series of bent-core mesogens with the same chiral end chains $(S,S)$; compounds with even and odd carbon numbers (including oxygen) exhibit ferroelectric and antiferroelectric $B2$ phases, respectively. The odd-even behavior was confirmed in newly synthesized racemic compounds with chiral end chains of $R$ and $S$ forms $(R,S)$ together with $(R,R)$ and $(S,S)$ forms. According to our theoretical interpretation, ferroelectricity should be more stable in $(R,S)$ compounds than in $(S,S)$ compounds. Actually, the transition temperature from the isotropic phase to the $\mathrm{Sm}\text{−}CP$ phase was higher and the temperature range of the $B2$ phase was broader in the $(R,S)$ compound than in the $(S,S)$ compound.

This study was conducted to identify the relationship between control grade, stereoacuity and surgical success in basic intermittent exotropia. This retrospective study involved 44 basic intermittent exotropia patients who underwent strabismus surgery and completed at least 6 months of follow-up. The 44 patients were divided into three subgroups according to their control grade: group 1 (good control group, n = 12), group 2 (fair control group, n = 18), and group 3 (poor control group, n = 14). Evaluation was done to identify the relationships between near and distance stereoacuity and control grade, and between surgical success and control grade. Surgical success was defined as ocular alignment between 5 prism diopters esodeviation and 10 prism diopters exodeviation in the primary position at the final visit. Mean near stereoacuity measured by the graded circle test was 57.50 seconds of arc (seconds) in group 1, 77.77 seconds in group 2, and 131.43 seconds in group 3 (p < 0.01). Mean distance steroacuity measured by Mentor B-VAT II BVS contour circle was 108.33 seconds in group 1, 148.33 seconds in group 2, and 262.82 seconds in group 3 (p < 0.01). Ten patients (83.33%) in group 1, 12 (66.67%) in group 2, and 9 (64.29%) in group 3 obtained surgical success (p = 0.28). In basic intermittent exotropia, better control grade was significantly accompanied by better stereoacuity. Better control grade was accompanied by higher surgical success rate but with no statistical significance.

Although the long-term survival of patients suffering from coronary spasm is usually excellent, serious complications can develop, such as disabling pain, myocardial infarction, ventricular tachyarrhythmias, atrioventricular block and sudden cardiac death. A 40-year-old man who had intractable chest pain from coronary artery spasm suffered ventricular fibrillation and an acute anterior myocardial infarction upon first admission. The patient underwent a coronary angiogram. which revealed a spontaneous focal spasm at the proximal left anterior descending coronary artery(LAD). He was treated by the combination of nitrate and calcium channel blocker, but continued to complain of severe chest pain despite intensive medical therapy and he had to be treated in the emergency room 5 times during an 8-month follow-up period. An ergonovine coronary angiogram was performed and an intracoronary ultrasound examination, which revealed a focal spasm at the same site of the proximal LAD with a small amount of localized eccentric atheromatous plaque. A coronary artery stent was placed in the proximal LAD and his symptoms resolved. A follow-up coronary angiogram was performed 3 years after stenting and the stent remained patent without any in-stent restenosis or spasm.

β, γ-Epoxycarbonyl compounds were converted to thiophenes when treated with Lawesson's reagent in the presence of a catalytic amount of p-toluenesulfonic acid.