• The Journal of the Korea Contents Association
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• v.8 no.1
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• pp.59-67
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• 2008

Stalking is defined as an abnormal or long term pattern of threat of harassment directed toward a specific individual and obsessional following. This study use empirical method based on the self administrated questionnaire of 325 male and female university students in Korea, for understanding the actual conditions of stalking. The findings are as follows. First, 18(5.5%) students experienced the victimization of stalking. Female students were more likely to be victims of stalking than male. 4(1.3%) of students were stalkers. Second, Female students were more likely to be stalkers than male. The age of most stalkers were younger than 27 yrs.. And most stalking victims knew their stalker. Third, the most cause of stalking was revenge for denial of courtship. The most methods of stalking were making approaches and the communications via letter, telephone, and giving presents. And the most period of Stalking was in 6 months.

• Korean Journal of Environment and Ecology
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• v.31 no.5
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• pp.472-478
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• 2017

The feeding habits of Coreoperca herzi were investigated from specimens collected in the Geum River, from March to December 2016. The specimens were separated into groups of 38~70 mm, 71~109 mm, and over 110 mm in total length. The live foods of C. herzi included Ephemeroptera, Odonata, Plecoptera, Coleoptera, Diptera, Trichoptera, and fishes. The Korean aucha perches fed mostly on aquatic insects which took up 98.8% of food regarding the number, 55.8% regarding the biomass, and 97.1% in terms of iregarding the index of relative importance. They were carnivorous in diet and predators (stalker) in food intake characteristics and forms when applying Keenleyside's classification. The main food sources of C. herzi were Ephemeroptera, Diptera, and Trichoptera while Odonata, Plecoptera, Coleoptera, and fishes were rare. A food migration was observed since less Ephemeroptera was found and more Trichoptera and fishes were found in the biomass of the feed consumed by larger species. The amount of Coleoptera and Diptera did not change much with the size of the species. The overall composition of live food was not seasonal. The result of the study indicates that, when restoring the streams to be the habitat for the natural population increase of Coreoperca herzi, the environment should be inhabitable to Ephemeroptera, Diptera, and Trichoptera which are the main foods.

• Korean Journal of Environment and Ecology
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• v.37 no.3
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• pp.198-208
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• 2023

This study collected samples of Korean dark sleepers (Odontobutis interrupta) in the Keumdang Stream from March to November 2021 to investigate their feeding habits. The sizes were classified by age (1 year and 2 years old, and 3 years or older). The food organisms of O. interrupta included Isopoda, Amphipoda, and Decapoda of the Malacostraca, Ephemeroptera, Odonata, Hemiptera, Plecoptera, Coleoptera, Diptera, and Trichoptera belonging to the aquatic insect of Arthropoda (accounting for 86.6% of the population), Tubificida, Haplotaxida, and Rhynchobdellida belonging to the Clitellata of Annelida (accounting for 7.3%), Systellommatophora and Mesogastropoda belonging to the Gastropodo of Mollusca (accounting for 2.8%), fish (accounting for 3.3%), and fish eggs. Korean dark sleepers fed mostly on aquatic insects, fish, crustaceans, and annelids. Aquatic insects were the most important food source, with 70.1% of the population, 31.7% in biomass, and 72.6% in the index of relative importance. Korean dark sleepers were carnivorous in diet and belonged to the stalker in food intake characteristics and forms. A food migration was observed since less Diptera was found, and more fish, Decapoda, Trichoptera, and Odonata were found in the biomass of the feed consumed by larger species. Diptera (65.3%), Haplotaxida (14.5%), Ephemeroptera (7.0%), Diptera (58.6%), Ephemeroptera (24.5%), fish (4.8%) Diptera (30.1%), Ephemeroptera (20.4%), Isopoda (13.3%) were mainly fed in the autumn.

• 한국연소학회:학술대회논문집
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• 2005.10a
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• pp.238-244
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• 2005

This study performs the pilot-plant experiments to evaluate the effect of the oxygen enrichment on the co-incineration of municipal solid waste and organic sludge from a wastewater treatment facility. The design capacity of the stoker-type incinerator pilot-plant is 150 kg/h. Combustion chamber temperatures were measured as well as the stack gas concentrations, i.e., NOx, CO, and the residual oxygen. The maximum ratio of organic sludge waste to the total waste input is 30%. Also the oxygen-enriched air with 23% of oxygen in supplied air is used for stable combustion. As the co-incineration ratio of the sludge increased up to 30% of the total waste input, the primary and the secondary combustion chamber temperature was decreased $to900^{\circ}C$ (primary combustion chamber), $750^{\circ}C$(secondary combustion chamber), respectively, approximately $200^{\circ}C$ below the incineration temperature of the domestic waste only (primary: $1,100^{\circ}C$, secondary: $950^{\circ}C$). However, if the supplied air was enriched to 22% oxygen content in air, the incinerator temperature was high enough to burn the waste mixture with 30% sludge, which has the heating value of 1,600 kcal/kg.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.2
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• pp.395-410
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• 2015

This research defines the degree of the threat caused by the leakage of personal information in a quantitative way. The proposed definition classifies the individual items in a personal data, then assigns a risk value to each item. The proposed method considers the increase of the risk by the composition of the multiple items. We also deals with various attack scenarios, where the attackers seek different types of personal information. The concept of entropy applies to associate the degree of the personal information exposed with the total risk value. In our experiment, we measured the risk value of the Facebook users with their public profiles. The result of the experiment demonstrates that they are most vulnerable against stalker attacks among four possible attacks with the personal information.