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김종국,정인근 한국경영정보학회 2007 한국경영정보학회 학술대회논문집 Vol.2007 No.-
2007 년 3 월 3.5 세대인 HSDPA 의 전국 서비스가 시작되면서 HSDPA 휴대전화는 영상통화를 중심으로 한 다양한 기능으로 소비자를 유혹하고 있지만 설문조사에 의하면 HSDPA 에 대해 소비자들은 과반수 이상이 필요성을 못 느끼고 있고 3 세대에서 2 세대로의 '역(逆) 번호이동'도 꾸준히 늘고 있는 것으로 나타났다. 이는 소비자들이 HSDPA 휴대전화라는 신기술에 대해 기술 수용과 혁신 저항을 동시에 하고 있는 것으로 판단된다. 따라서 기술 수용과 혁신 저항의 관점에서 연구를 진행하였다. 연구결과는 유용성, 편이성, 혁신제품의 특징, 더 좋은 제품 기대가 태도에 영향을 미치는 것으로 나타났고 자기효능, 복잡성, 지각된 위험, 기존 제품에 태도는 태도에 영향을 미치지 않는 것으로 나타났다.
미성숙 및 성숙미경산우의 다배란 처리가 난소반응 , 수정란 생산과 수태에 미치는 영향
김종국(J . G . Kim),정구민(K . M . Chung),임경순(K . S . Im),이용빈(Y . B . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.5
This experiment was carried out to investigate the effects of superovulation on the ovarian response and non-surgical recovery in immature and mature heifers. The possibility of nonsurgical recovery from the immature heifers and pragnancy of embryos transferred to mature recipients was also investigated. Total 8 heifers (S heads of Holstein, 2 heads Korean Native Cattle (KNC) and 1 head of Angus × Hereford crossbred) were devided into 2 groups by their age. Immature heifers (Group I) were 7-10 months old and mature heifers (Group II) were 12-18 months old. Heifers of Group I and Group II were superovulated with muscular injection of 1,000 or 2,000 IU Pregnant Mare`s Serum Gonadotropin (PMSG) on day 10-12 of estrous cycle followed by muscular injection of 25㎎ PGF₂α 48h later. Heifers were artifically inseminated or copulated 2 to 3 times with the interval of 12h while they were in heat. The embryos were collected non-surgically on day 6 of estrous cycle. The results obtained from this study were summarized as follows: 1. The average number of corpus lutea (CL) by the superovulation treatment was much greater in Group II (9.2) than in Group I (3.2). 2. The average number of unruptured follicles by superovulation treatment was much grater in Group II (6.8) than Group I (1.0). 3. The interval to onset estrus after PGF₂α injection was longer in Group I (44.2) than in Group II (31.8h). 4. There was no difference in the duration of estrus between Group I (32.0h) and Group II (37.5h). 5. It was possible to flush the uterus of 7 month old KNC heifers non-surgically. 6. The average number of embryos recovered was much greater in Group II (6.0) than in Group I (2.3) and the recovery rate of embryos in Group I (73.6%) was similar to that Group II (87.3%). More flushing fluid was recovered in Group I (93.0%) than in Group II (87.3%). 7. Twelve of 14 embryos recovered (87.5%) were normal in Group I, while 17 of 54 embryos (31.5%) were normal in Group II. 8. All of the normal embryos (12/12) were morula in Group I, while 82.4% (14/17) of the normal embryos were monala and 17.6%o (3/17) were blastocysts in Gooup II. 9. The estrous cycle after superovulation treatment tended to become longer with the average of 24.8 days in Group I and 24 days in Group II. Some donor heifers had cystic ovaries. 10. Six embryos were transferred to 4 recipients non-surgically. One recipient who had received 2 morula that were recovered from a 10 month old KNC-2 became pregnant and delivered a male Korean native calf of 27 Kg.
Changes in Color Parameters of Corn Kernels during Roasting
정헌식,김종국,문광덕,윤광섭 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
Changes in color parameters (L*, a*, b*, ΔE*,ho, and C* values) of corn during roasting were investigatedand subsequently described using mathematical models. Corn kernels were roasted for 50 min at 160, 180, 200,220, and 240oC. The L*, b*, ho, and C* values tended todecrease more rapidly as the roasting temperature and timeincreased up to 220oC and 50 min, whereas a* and ΔE*values tended to increase. Variation of L* and ΔE* valueswas found to be proportional to the roasting temperatureand time. Variation of L* value during roasting above180oC was adequately described by a first-order model. Cubic model satisfactorily described changes in all of colorparameters over the temperature range. Activation energiesof L* and ΔE* values were determined as 34.04 and 79.16kJ/mol, respectively. Results suggest that L* and ΔE*values may be used as color control indicators duringroasting of corn kernels.
소의 受精卵 移植에 관한 硏究 : II. 性成熟 過程의 처녀우의 多排卵 誘起와 受胎에 관한 硏究
任京淳,李用斌,鄭丘敏,金鍾國 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
This experiment was carried out to investigate the effects of superovulation on the ovarian response and embryo production of young and matured heifers. The possibility of mon-surgical recovery from the young heifers and transfer of recovered embryos to the mature recipients was also investigated. A total of 8 heifers(5 heads of Holstein, 2 Heads of Korean Native Cattle(KNC)and one head of Angus×Hereford crossbreed)were devided into 2 groups by their age. Young heifers(Group I)were 7∼10 months old and mature heifers(Group II)were 12∼18 months old. Group I and II were superovulated with muscular injection of 1,000 or 2,000 IU Pregnant Mare's Serum Gonadotrophin(PMSG)on day 10∼12 of estrus cycle followed by muscular injecion of 25mg Prostaglandin F ₂α(PGF₂α) 48 hours later. Heifers were artificially inseminated or copulated 2∼3 times with the interval of 12 hours while they were in heat. The embryos were collected non-surgically on day 6 of estrus cycle. The results obtained from this study were summarized as follows: 1. The average number of corpus lutea(CL) by the superovulation treatment was much greater in Group 11(9.2)than in Group 1(3.2) 2. The average number of unruptured follicles by the superovulation treatment was much greater in Group II(6.8)than Group I(1.0) 3. The interval to onset of estrus after PGF₂αinjection was longer in Group I(44.2 hours)than in Group II(31.8 hours).