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What should be considered to redesign Netflix for Middle-aged South Korean People?
Wonjae Lee,Juwhan Han,Taeyoung Go,Makida Gebregiorgis Tesfaye 한국HCI학회 2022 한국HCI학회 학술대회 Vol.2022 No.2
As Netflix is getting increasingly popular in COVID-19 situation, this study aims to understand the needs and wishes of the middle-aged people in South Korea so that the service can deliver better user experience for the user group. A main research question was formulated, what designers can do to improve the current experience of Netflix users aged 40-60. To answer the question, user interviews, narration, and collage making were adopted as method. Those who were familiar with the existing broadcasting media services were recruited. By studying the middle-aged, it was discovered that the absence of various genres and the inconvenience of using buttons were problematic, and also that they wanted to feel experiences that could not be experienced in reality and various emotions that communicate with reality through Netflix. The implications and limitations of the study were discussed at the end.
Investigation of Enantiomer Separation Using Chiral Crown Ethers as Chiral Selectors
Lee, Wonjae The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.1
A number of chiral selectors have been developed and applied for enantiomer separation of a variety of chiral compounds. Among these chiral selectors are chiral crown ethers, a class of synthetic host polyether molecules that bind protonated chiral primary amines with high selectivity and affinity. In this paper, two important chiral crown ethers as chiral selectors of bis-(1,1'-binaphthyl)-22-crown-6 and (18-crown-6)-2,3,11,12-tetracarboxylic acid (18-C-6-TA) are focused. They have been widely used to resolve the enantiomers of chiral compounds containing a primary amino moiety using chiral stationary phases (CSPs) or chiral selectors by high-performance liquid chromatography (HPLC), capillary electrophoresis (CE) and so on in chirotechnology. Also, it was described that the commercially available covalent type HPLC CSPs derived from (+)- and (-)-18-C-6-TA have been developed and successfully applied for the resolution of various primary amino compounds including amino acids.
Comparison of Expert and Novice Pilot Situation Awareness during Landing
Wonjae Lee,Chunghoon Kim,Sungho Kim 대한인간공학회 2017 대한인간공학회 학술대회논문집 Vol.2017 No.11
Objective: This study was to compare and quantify the level of situation awareness (SA) between expert and novice pilots using eye tracking features. Background: Successful and safe landing requires a high SA of pilots. However, existing studies have examined simple SA status, which was lack of comprehensively understanding by linking SA model and quantitative features. Method: The experiments were conducted by five repeated landing for four expert and four novice pilots using flight simulator and eye tracking equipment. Three eye tracking features (visit frequency, dwell time ratio, scan path entropy) were calculated for reflecting three level of SA model (perception, comprehension, projection). The classification of SA status was performed by applying significant eye tracking features, developing binary logistic regression model, testing 5-fold cross validation. Results: Visit frequency of expert pilots was 138%, 47%, 85%, 67%, 117%, and 91% higher than novice pilots in RPM, VVI, altimeter, heading, airspeed, and attitude areas of interest (AOIs) respectively; while 50% and 33% lower in runway and outside AOIs respectively. Dwell time ratio of expert pilots was 38% and 42% higher than novice pilots in runway and outside AOIs respectively; while 62%, 62%, and 65% lower in altimeter, airspeed, and attitude AOIs respectively. Scan path entropy of expert pilots was 33% higher than novice pilots in outside AOI; while 29% lower in attitude AOI. Sensitivity of the classification model for SA high and low status was 73.7%.Conclusion: This study showed that the difference between SA level of expert and novice pilots could be identified by using novel eye tracking features and applied to develop classification model for SA high and low status. Application: The results of this study can be used as objective data of strategy establishment or training feedback for novice pilots.
Towards 6G Hyper-Connectivity: Vision, Challenges, and Key Enabling Technologies
Lee, Howon,Lee, Byungju,Yang, Heecheol,Kim, Junghyun,Kim, Seungnyun,Shin, Wonjae,Shim, Byonghyo,Poor, H. Vincent 한국통신학회 2023 Journal of communications and networks Vol.25 No.3
Technology forecasts anticipate a new era in whichmassive numbers of humans, machines, and things are connectedto wireless networks to sense, process, act, and communicatewith the surrounding environment in a real-time manner. Tomake the visions come true, the sixth generation (6G) wirelessnetworks should be hyper-connected, implying that there areno constraints on the data rate, coverage, and computing. Inthis article, we first identify the main challenges for 6G hyper-connectivity, including terabits-per-second (Tbps) data rates forimmersive user experiences, zero coverage-hole networks, andpervasive computing for connected intelligence. To overcomethese challenges, we highlight key enabling technologies for6G such as distributed and intelligence-aware cell-free mas-sive multi-input multi-output (MIMO) networks, boundless andfully integrated terrestrial and non-terrestrial networks, andcommunication-aware distributed computing for computation-intensive applications. We further illustrate and discuss thehyper-connected 6G network architecture along with open issuesand future research directions.
Lee Wonjae,Park Seungsoo,Park Jaikoo 한국자원공학회 2021 Geosystem engineering Vol.24 No.4
In this study, the grinding characteristics of waste printed circuit boards (PCBs) were evaluated using a population balance model (PBM). The grinding characteristics under various conditions (hammer rotational speeds of 1600, 2000, and 2400 rpm; screen aperture sizes of 0.71, 1.0, and 1.40 mm; and maximum feed sizes of 4, 6, and 8 mm) were identified. A PBM for a continuous hammer mill was used to quantitatively demonstrate the grinding characteristics. No significant difference was observed in the particle sizes of the products for various hammer rotational speeds. Nevertheless, the specific rate of breakage increased with the hammer rotational speed. As expected, a narrow screen aperture yielded a fine product. The mean residence time was increased in this case to comminute the particles to a finer size. Furthermore, a finer feed was predicted to yield a finer product; however, a coarser feed was observed to yield such a product instead. Each hammer milling condition should be controlled with respect to the hammer milling performance and target particle size of the product.