Advantages And Shortcomings Of Korean Chaebols

The prevalent form of business organizations in Korea is a chaebol. The chaebol is a diversified conglomerate. This paper addresses the following issues concerning Korean chaebols:  1) reasons for diversification, 2) advantages and shortcomings of chaebols, 3) issues facing Korean chaebols, and 4) chaebols’ managing the crisis and making reforms. We found that Korean chaebols managed to learn from the economic crisis and made successful reforms

Advantages And Shortcomings Of Korean Chaebols

The prevalent form of business organizations in Korea is a chaebol. The chaebol is a diversified conglomerate. This paper addresses the following issues concerning Korean chaebols:  1) reasons for diversification, 2) advantages and shortcomings of chaebols, 3) issues facing Korean chaebols, and 4) chaebols’ managing the crisis and making reforms. We found that Korean chaebols managed to learn from the economic crisis and made successful reforms

PU GNN: Chargeback Fraud Detection in P2E MMORPGs via Graph Attention Networks with Imbalanced PU Labels

The recent advent of play-to-earn (P2E) systems in massively multiplayer online role-playing games (MMORPGs) has made in-game goods interchangeable with real-world values more than ever before. The goods in the P2E MMORPGs can be directly exchanged with cryptocurrencies such as Bitcoin, Ethereum, or Klaytn via blockchain networks. Unlike traditional in-game goods, once they had been written to the blockchains, P2E goods cannot be restored by the game operation teams even with chargeback fraud such as payment fraud, cancellation, or refund. To tackle the problem, we propose a novel chargeback fraud prediction method, PU GNN, which leverages graph attention networks with PU loss to capture both the players' in-game behavior with P2E token transaction patterns. With the adoption of modified GraphSMOTE, the proposed model handles the imbalanced distribution of labels in chargeback fraud datasets. The conducted experiments on three real-world P2E MMORPG datasets demonstrate that PU GNN achieves superior performances over previously suggested methods.Comment: Under Review, Industry Trac

Influence of Calcium Sulfate Type on Evolution of Reaction Products and Strength in NaOH- and CaO-Activated Ground Granulated Blast-Furnace Slag

This study investigated the influences of CaSO4 type (i.e., anhydrite vs. gypsum) on strength development and reaction products in the activation of ground granulated blast-furnace slag (GGBFS) when different activators (i.e., CaO vs. NaOH) and sources of GGBFS were used. In the CaO-activation, the addition of calcium sulfates greatly enhanced 28-day strengths, regardless of the choice of CaSO4 or GGBFS source, through increasing the quantities of reaction products and reducing pore volume and size. However, in the NaOH-activation, the use of calcium sulfates showed the complex dependency of strength on the choice of CaSO4 type and GGBFS source, and it barely produced beneficial effects on the quantity of reaction products and reduction of pore volume and size. Thus, the results in this study indicate that the combination of CaO-activation and calcium sulfates is a more effective means of activating GGBFS to gain enhanced strength and significant quality control than the use of gypsum with NaOH-activation

High Shear Stress at the Surface of Enhancing Plaque in the Systolic Phase is Related to the Symptom Presentation of Severe M1 Stenosis

The computational fluid dynamics methods for the limited flow rate and the small dimensions of an intracranial artery stenosis may help demonstrate the stroke mechanism in intracranial atherosclerosis. We have modeled the high wall shear stress (WSS) in a severe M1 stenosis. The high WSS in the systolic phase of the cardiac cycle was well-correlated with a thick fibrous cap atheroma with enhancement, as was determined using high-resolution plaque imaging techniques in a severe stenosis of the middle cerebral artery

Separated Fetus-in-fetu In Retroperitoneum

Fetus-in-fetu is an extremely rare enigmatic condition, every case of which should be carefully examined, particularly for the distinction between it and a mature teratoma and the determination of its embryopathogenesis. This report deals with a case of fetus-in-fetu that was found in two parts. The host(autosite) was a 14month- old boy who first presented with a back mass. A large round mass, 7 X 6 X 6cm, was removed from the left upper retroperitoneum. The mass was cystic containing 200ml of yellow serous fluid and consisted of two separate masses. One part resembled a stunted dysmorphic fetus, while the other was an amorphous lump, which disclosed a sacrococcygeal bone with five vertebrae. Histologically, both masses showed largely regressed digestive, respiratory, and musculoskeletal tissue. However, the parenchymal organs were missing. Definite vertebral bones, intervertebral discs, and spinal cord remnant were found

Subacute Neurological Deterioration with Selective Axonal Injury in Patients with Acute Ischemic Stroke following Reperfusion of Middle Cerebral Artery Occlusion

To date, the long-term effects of reperfusion on the salvaged brain tissues have not been addressed in the literature. We report 4 cases presenting subacute neurological deteriorations with selective axonal injury following reperfusion therapies for acute ischemic stroke. Our case series based on 4 patients showed common features distinct from those of early reperfusion injury in that (1) the neurological symptoms developed after 1-2 months of reperfusion therapies, (2) these symptoms were accompanied by the subcortical white matter changes on brain MRI, and (3) these findings were mostly reversible with time. This suggests that axons in the reperfused brain may be vulnerable to further neurological injury