• 경영과학
• /
• 제30권2호
• /
• pp.133-141
• /
• 2013

In this paper, we considers the outsourcing decision problem in a single machine scheduling problem. The decision problem is to determine for each job whether to be processed on an in-house manufacturing or external facilities(outsourcing). Moreover, this paper considers a situation where each job has a due date. The objective of the problem is to minimize the outsourcing cost, subject to the due date constraints. The considered problem is proved to be NP-hard. Some solution properties and valid inequalities are derived, and an effective lower bound is derived based on the LP-relaxation. The results of experimental tests are presented to evaluate the performance of the suggested lower bound.

• 산업경영시스템학회지
• /
• 제6권9호
• /
• pp.45-59
• /
• 1983

This study focuses on the growth and development of small and medium industries of Korea, orienting to the development of up-to-date technology from now on and bolstering their competitive ability in the rapidly changing international markets. For this purpose, the small and medium industries should 1) develop high-level manpower of up-to-date technology, 2) make constant efforts to categorize and divide the fields of technology with big business groups to boost their competitiveness, 3) raise automation rate by turning all facilities into mechatronics, 4) positively develop software know-how, 5) jointly conduct researches in cooperation with venture capital and Governmental research institute, 6) categorize an systematize the industries. On the Governmental level, there should be 1) wide-ranging support and assistance in technology, finance, and the facilities, 2) positive opening of consumer market, 3) assistance in technical cooperation with other nations, 4) and such indirect assistance as fostering the fields of related technology.

• 산업경영시스템학회지
• /
• 제31권4호
• /
• pp.1-9
• /
• 2008

JIT 생산시스템이 세계적으로 많은 회사에 적용됨에 따라 earliness와 tardiness의 페널티를 동시에 최소화하는 문제에 대한 많은 연구가 진행되어 왔다. 이 연구에서는 한정된 완료시간의 편차에 대해서는 페널티를 부과하지 않는, 즉 허용오차가 존재할 때, 공통의 납기로부터 평균제곱편차(MSD : Mean Squared Deviation)를 최소화하는 단일기계 문제를 다룬다. 허용오차가 존재하는 MSD 문제에서 최적의 공통 납기를 결정하는 방법을 개발한다. 스케줄과 허용 오차가 주어질 때, 최적의 납기를 찾는 두 개의 선형시간이 소요되는 알고리즘을 제시한다. 주어진 허용오차 중 하나는 가장 짧은 가공시간을 가지는 작업의 절반보다 작은 경우이며 다른 하나는 허용오차가 임의인 경우이다.

• 한국초지조사료학회지
• /
• 제14권1호
• /
• pp.42-49
• /
• 1994

To examine the productivity, growth characteristics, and nutritive value of forage rye at the southern region of Korea, fourteen varieties of rye were sown at Nov. 13, 1992 at the plot of experiment farm of Crop Experiment Station, Mokpo Branch, and over winter survival rate, heading date, yield, yield components and nutritional values were measured. All the varieties used in this experiment showed 100% over winter survival rate at the sowing date of Nov. 13. Heading dates of all the varieties ranges from Apr. 25 to May 10, which seems to be early enough to get high yield. The varieties, Paldal-hod, and Danko introduced from Japan appear to be the most recommended ones in the southem region of Korea. They showed early heading date of Apr. 25, large plant height, greater number of leaves, high yield, low content of crude fiber and crude fat, high crude protein, NFE, and crude a5h.

• 대한가정학회지
• /
• 제34권5호
• /
• pp.235-248
• /
• 1996

The purpose of this study was to search for new food labeling system that would support effective consumer decision-making, by examining consumer behavior of food labels and its' related factors. The survey was conducted on 410 housewives under 60-year-old who live in Seoul or Metropolitan area, using questionnaires and the illustrated material of labels. Respondents generally considered food labels very important as devices. Among 12 items of label which are required to disclose, they evaluated circulation period, and nutritional information. Among 12 items of label, housewives read manufacture date, circulation period, and price more often than business admission number and self standard number. The respondents preferred the format of marking both manufacture date and expiration date on the same side, the format of printing both price and weight on the same side of package, the diagramatic type, and the format represented by ration graph per daily value.

• 한국실내디자인학회:학술대회논문집
• /
• 한국실내디자인학회 2005년도 춘계학술발표대회 논문집
• /
• pp.182-186
• /
• 2005

The purpose of this research is to develop subject of up-to-date scientific technology, according with science museum, and to deviate from the old style, simply-seeing display, and the passive display which simply support narrative styles by one-way action. In addition, for motivating audience to take part in the display, this study is to analyze displaying technique, key marks of an exhibit and then to create the way which science museum should follow in order to plan interactive scenario and display technique. By analysis and consideration of museums, which I took for a sample, this study will work out display scenario, based on interactive concept, and experience display technique. Moreover, this study will suggest alternatives and basis in order to develop display technique of up-to-date science in science museum.

• 산업경영시스템학회지
• /
• 제27권4호
• /
• pp.141-146
• /
• 2004

This research considers the problem of scheduling jobs on unrelated parallel machines with a common due date. The objective is to minimize the total absolute deviation of job completion times about the common due date. This problem is motivated by the fact that a certain phase of printed circuit board manufacturing and other production systems is bottleneck and the processing speeds of parallel machines in this phase are different for each job. A zero-one integer programming formulation is presented and two dominance properties are proved. By these dominance properties, it is shown that the problem is reduced to asymmetric assignment problem and is solvable in polynomial time.

• 한국식품저장유통학회지
• /
• 제1권1호
• /
• pp.29-36
• /
• 1994

This study was carried out for the establishment of optic harvest date and storage condition of 'Fuji' apple for CA storage. Apples were picked at 10 day intervals from 17 Sept to 27 Oct.. Apples were analyzed for respiration rata, weight flesh firmness, titratable acidity, soluble solid, total sugar, reducing sugar, surface color and thiault value. In 1990, the optimal harvest season could be judged between 17 Oct. and 27 Oct. from the results of respiration rate rise and change of quality properties. Apples harvested on 27 Oct. wert stored at 2$^{\circ}C$ and 90~95% RH in 1%O2 + 3%CO2, 3%O2 + 3%CO2 and air for 9 months. After 9 months of storage, apples kept in CA storages had beater quality than apples kept in refrigeration storage. Especially, apples kept in 1%O2, + 3%CO2 were fumer and more acid than those kept in 3%O2 + 3%CO2 At the sensory evaluations, apples stored in CA were rated higher quality than apples stared refrigeration.

• 한국자원식물학회지
• /
• 제21권3호
• /
• pp.192-195
• /
• 2008

This study was conducted to find out some important agronomic characteristics and qualities in response to different transplanting dates in Alisma plantago at southern parts of Korea. Yield components such as number of floral axis per plant, plant height and number of leaves were highest at the transplanting date of Aug. 15 and Aug. 25. Plants sown at Aug. 15 and Aug. 25 also showed highest yield. Considering from our results, optimum transplanting date were semed to be transplanting date of Aug. 15 and Aug. 25.

• 한국항만학회지
• /
• 제5권2호
• /
• pp.3-10
• /
• 1991

Although Korea has had a proud maritime history of thousands of years marked by outstanding leaders such as Chang Bogo and Yi Soon-shin there has not been a unified 'Ocean Day' like the one in Japan. Extensive historical survey revealed eight candidate days for ocean day designation. Historical significance, seasonal consideration and other factors were examined with respect to each candidate date. Of the eight events the establishment of Chunghaejin maritime base on the island of Wando on the southern coast of Korea by Admiral Changbogo in the lunar month of April in the year of 828 is judged to have the greatest desirability Institution of 'Ocean Day' is recommended with the date to celebrate as May 20(a convenient date of May as translated into solar month). A weeklong celebration throughout the country is also recommended with colorful events to be had over the Ocean Week following the Ocean Day.