오늘날 게임 산업은 지속적으로 성장하고 있는 추세이다. 이런 배경에서 게임 이용자들은 다양한 게임 장르를 경험하고 있으며, 또한 게임 내의 승률을 높이기 위한 다양한 활동에 많은 관심을 가지고 있다. 게임 이용자 들은 자신이 즐기는 게임 캐릭터들의 승률 및 픽률과 같은 다양한 정보들을 인터넷 검색을 통해 수집하고 있 으며, 그에 따라 자신이 즐기는 게임 플레이어의 밸런스에 관해서 많은 관심을 나타내고 있다. 본 연구자는 밸런스 관련 다양한 연구를 탐색하는 과정에서 게임 속의 밸런스를 맞추는 기준이 있다면, 또한 그 기준에 대 한 예측이 가능하다면 그 기준을 중심으로 이용자들의 다양한 밸런스 패치 활용 및 게임 전략 수립에 도움이 될 수 있을 것으로 판단하였다. 본 연구에서는 플레이어들의 밸런스 패치가 중요하게 인식되고 있는 MOBA 장르 게임을 중심으로 밸런스 패치 예측 기준을 수립하는 데 초점을 맞추었다. 특별히 밸런스 패치를 진행할 때 캐릭터들의 특성 및 개발자의 패치 코멘트, 그리고 승률 및 픽률 변화에 따른 이후 패치 로드맵까지 고려 할 수 있는 체계를 제시한 점에서 큰 의의가 있다고 볼 수 있다. 이를 통해 개발자는 플레이어들의 밸런스를 더 쉽게 맞출 수 있도록 유도하고, 플레이어는 밸런스 패치를 예측하여 더욱 효율성 있는 게임 전략을 실행할 수 있도록 유도하여 MOBA 장르 게임의 이해관계자 모두에게 도움이 되는 정보를 전달할 것이다.

This study investigates the directional recrystallization behavior of Ni based oxide dispersion strengthened (ODS) alloy according to the zone annealing velocity. The zone annealing temperature is set as 1390oC, while the zone velocities are set as 2.5, 4, 6, and 10 cm/h, respectively. The initial microstructure observation of the as-extruded sample shows equiaxed grains of random orientation, with an average grain size of 530 nm. On the other hand, the zone annealed samples show a large deviation in grain size depending on the zone velocities. In particular, grains with a size of several millimeters are observed at 2.5-cm/h zone velocity. It is also found that the preferred orientation varies with the zone annealing velocity. On the basis of these results, this study discusses the role of zone velocities in the directional recrystallization of Ni base ODS alloy.

In order to expand the application of oxide dispersion-strengthened (ODS) steel, a composite material is manufactured by adding mechanically alloyed ODS steel powder to conventional steel and investigated in terms of microstructure and wear properties. For comparison, a commercial automobile part material is also tested. Initial microstructural observations confirm that the composite material with added ODS steel contains i) a pearlitic Fe matrix area and ii) an area with Cr-based carbides and ODS steel particles in the form of a Fe-Fe3C structure. In the commercial material, various hard Co-, Fe-Mo-, and Cr-based particles are present in a pearlitic Fe matrix. Wear testing using the VSR engine simulation wear test confirms that the seatface widths of the composite material with added ODS steel and the commercial material are increased by 24% and 47%, respectively, with wear depths of 0.05 mm and 0.1 mm, respectively. The ODS steel-added composite material shows better wear resistance. Post-wear-testing surface and cross-sectional observations show that particles in the commercial material easily fall off, while the ODS steel-added material has an even, smooth wear surface.

This study investigates the oxidation properties of Fe-14Cr ferritic oxide-dispersion-strengthened (ODS) steel at various high temperatures (900, 1000, and 1100°C for 24 h). The initial microstructure shows that no clear structural change occurs even under high-temperature heat treatment, and the average measured grain size is 0.4 and 1.1 μm for the as-fabricated and heat-treated specimens, respectively. Y–Ti–O nanoclusters 10–50 nm in size are observed. High-temperature oxidation results show that the weight increases by 0.27 and 0.29 mg/cm2 for the asfabricated and heat-treated (900°C) specimens, and by 0.47 and 0.50 mg/cm2 for the as-fabricated and heat-treated (1000°C) specimens, respectively. Further, after 24 h oxidation tests, the weight increases by 56.50 and 100.60 mg/cm2 for the as-fabricated and heat-treated (1100°C) specimens, respectively; the latter increase is approximately 100 times higher than that at 1000°C. Observation of the surface after the oxidation test shows that Cr2O3 is the main oxide on a specimen tested at 1000°C, whereas Fe2O3 and Fe3O4 phases also form on a specimen tested at 1100°C, where the weight increases rapidly. The high-temperature oxidation behavior of Fe-14Cr ODS steel is confirmed to be dominated by changes in the Cr2O3 layer and generation of Fe-based oxides through evaporation.

교정행정에서 수형자의 재범 위험성 판단은 수형자 관리 및 출소 후 사회 안전망 확보에 매우 중요한 의미를 가지고 있다. 그러나 그동안 수형자의 재범위험성을 판단 할 수 있는 전문 평가 도구가 없었다. 그러던 중에 2012년 3월 법무부 교정본부에서 자체적으로 수형자의 재범 위험성을 판단할 수 있는 평가도구를 개발하였다. 이 평가도구는 ‘교정재범예측지표(CO-REPI)’로서 전체 23개 문항으로 구성되어 있으며 교정현장에서 현재까지 약 3년6개월 정도 사용되고 있다. 중간처우 대상자를 선발하는 경우 또는 가석방 대상자선정 시 등에 CO-REPI의 결과가 적용되고 있는 것이다. 그런데 본 검사도구는 수형자 처우에 직결되는 중요한 역할을 하고 있지만 아직 사용기간이 짧다는 이유로 재범예측 도구로서의 타당성을 검증하지 못하고 있었다. 이러한 시기에 CO-REPI의 타당성에 대하여 검증을 하고 합리적인 검사도구로 발전시키려는데 본 연구의 목적이 있다. 연구방법으로는 1) 검사도구 개발과정의 타당성을 살펴보았으며, 2) 재복역자의 CO-REPI 등급별 상관관계를 분석하였고, 3) 평가요인 23개 항목에 대하여 카이제곱검정, T-검정, 판별분석, 대응일치분석을 실시하였다. 그리고 이러한 분석을 종합한 결과 본 검사도구는 재범을 예측할 수 있는 충분한 수준에 있다고 판단되었다. 그러나 연구를 마치면서 다소 아쉬웠던 점은 우리 교정시설에서 CO-REPI 검사도구를 사용한 기간이 너무 짧아서 정확한 분석을 할 수 없었다는 것이다. 시간이 흘러 축적된 자료가 충분해진다면 보다 정확한 검증과 개선이 가능할 것으로 판단된다.

Fe-base superalloy powders with Y2O3 dispersion were prepared by high energy ball milling, followed by sparkplasma sintering for consolidation. High-purity elemental powders with different Fe powder sizes of 24 and 50mm were usedfor the preparation of Fe-20Cr-4.5Al-0.5Ti-O.5Y2O3 powder mixtures (wt%). The milling process of the powders was carriedout in a horizontal rotary ball mill using a stainless steel vial and balls. The milling times of 1 to 5 h by constant operation(350 rpm, ball-to-powder ratio of 30:1 in weight) or cycle operation (1300 rpm for 4 min and 900 rpm for 1 min, 15:1) wereapplied. Microstructural observation revealed that the crystalline size of Fe decreased with an increase in milling time by cyclicoperation and was about 15nm after 3 h, forming a FeCr alloy phase. The cyclic operation had an advantage over constantmilling in that a smaller-agglomerated structure was obtained. The milled powders were sintered at 1100oC for 30 min invacuum. With an increase in milling time, the sintered specimen showed a more homogeneous microstructure. In addition, ahomogenous distribution of Y-compound particles in the grain boundary was confirmed by EDX analysis.

Since the conventional methods of physical therapy may decrease the motivation of a patient for rehabilitation due to repetitive, monotonous movement, a new physical therapy system inducing a motivation from the patient is needed. The present study is intended to develop a physical therapy serious game for enhancement of dynamic balance control. The balance control therapy game was developed by the following steps: (1) survey of existing balance control therapy systems, (2) analysis of balance control literature, (3) ideation and architecture planning of the balance control therapy game, and (4) implementation of the balance control therapy game. The proposed physical therapy serious game can provide better usability, satisfaction, clinical effectiveness for balance control than the conventional methods.

Kegel exercise is commonly prescribed to improve the urination and evacuation capabilities of a patient. Assistive devices developed for Kegel exercise are found limited in terms of clinical effectiveness and motivation. The present study is intended to develop a serious game to support active and sustainable Kegel exercise for patients. A four-step process (benchmarking, analysis of patent and technology, ideation of hardware and software, and implementation) is applied in the present study to development of a Kegel serious game. The proposed serious game for active Kegel exercise needs to be validated in urology clinics.

Although motivation and fun are important for effective speech therapy, the conventional speech therapy is often conducted by using a textbook which can be boring to the speech-handicapped. The present study is to develop a speech therapy serious game for rehabilitation of the handicapped with articulation and fluency in speech. A speech therapy game was developed in the present study through the following four-step approach: (1) benchmarking analysis of 8 speech therapy systems, (2) analysis of 22 parents, (3) development of the framework of the speech therapy game and ideas for speech therapy game contents, and (4) implementation of the speech therapy serious game system using C# and the game engine Unity. The speech therapy serous game developed in the study can be of help for rehabilitation of articulation and fluency for the speech-handicapped.

아메리카왕거저리(Zopobas atratus) 성충 410.5 ± 89.0개체를 넣은 사육상자에 서의 1주일간 평균 산란된 부화유충수는 4,658.5 ± 559.3 (mean ± SD)개체로 암컷 의 1일 산란수는 3.24 ± 1.80개 (mean ± SD)이었다. 부화 후 1개월간 발육하여 개체 당 평균 체중이 0.255g인 유충 1500, 1000, 500, 100개체를 사육상자에서 11주간 사육한 후 각각의 사육상자에서 개체수는 1,271 ± 36.1, 895.3 ± 72.2, 554.0 ± 13.5, 103.0 ± 11.3 (mean ± SD)개체이었다. 11주간 사육기간중 각각의 유충 사육상자에 서 사육기간 중 사망한 개체는 발견하지 못하였고 종령유충의 중량은 각각의 사육 상에서 0.96 ~ 0.97 g으로 유사하였다. 종령유충의 용화율은 용화틀 체적이 34.8 cm3, 58.5 cm3, 124.1 cm3일때 용화틀 투입 20일차까지 평균 87.5 ~ 88.9%로 차이 없게 조사되었다. 용화기간은 용화틀의 크기와 관계없이 1주일까지 65.6 ~ 67.9% 용화하였다.

A novel PM (powder metallurgy) steel for automotive power-train gear components was developed to reduce manufacturing cost, while meeting application requirements. The high-density PM steel was manufactured by mixing using special Cr-Mo atomized iron powders, high-pressure compaction, and sintering. Tensile strength, charpy impact, bending fatigue, and contact fatigue tests for the PM steel were carried out and compared to conventional forged steel. Pinion gears for auto-transmission were also manufactured by helical pressing, sintering, and surface densification process. In order to evaluate the durability of the PM parts, auto-transmission durability tests were performed using dynamometer tests. Results showed that the PM steel fulfilled the requirements for pinion gears indicating suitable tensile, bending fatigue, contact fatigue strengths and improved gear tooth profile. The PM gears also showed good performance during the transmission durability tests. As a result, the PM gears showed significant potential to replace the conventional forged steel gears manufactured by tooth machining (hobbing, shaving, and grinding) processes.

The recent trend of miniaturization and high performance of vehicle engines has put an urgent necessity for the development of valve seats which can operate under more severe conditions. In order to develope valve seat material that has the most excellent wear resistance at operating temperature of engine through improvement of the progress of work. the effects of mixing ratio of the milled powder on sintered and Cu-infiltrated properties of sintered valve seats have been studied. The resultant radial crushing strength and hardness of sintered specimens were gradually increased with increasement of volume of milled powders. It is because increasement of sintering density by increasing of surface diffusion. The hardness of Cu-infiltrated specimens became lower than that of the commercial powders as the increasement of volume of milled powders. It was due to the decrease of the amount of the martensite. By results of this research, It has been found that martensite is formed around of the Cu-infiltrated site and the decrease of the amount of the martensite is due to decrease of the amount of the Cu-infiltrated site by the decrease of gas channel.

지구온난화와 더불어 진행되어 온 북극 해빙의 급격한 감소는 최근 들어 새로운 항로(무역로)와 북극해 연안의 광대한 탄화수소 자원(석유 및 천연가스)에 대한 전망뿐만 아니라 환경과 기후에 대한 지구적 관심을 야기 시켰다. 이러한 현상은 21세기 이래 북극이 자원과 항로에 대한 경쟁과 갈등, 환경과 기후에 대한 토론과 논의의 장이 될 것이라는 우려와 염려로 이어졌다. 그렇기는 하나 자원과 항로에 대한 국제적 우려는 엄밀히 말하면 “해양의 헌법”이라 할 수 있는 유엔 해양법협약(UNCLOS)을 통해 불식시킬 수 있는 것으로 입증되었다. 또한 급격하게 변화하는 북극해의 거버넌스를 위한 법적 틀을 마련해 주었다. 본 논문에서는 ‘협약’과 북극해 관할권 간의 관계를 보다 명확히 밝히기 위해 북극해 지역을 다음과 같이 5개로 구분하여 검토할 것이다. ①북극해 대서양 통로, ②유라시아 북극해, ③북극해 태평양 통로, ④북미 북극해, ⑤중앙 북극해. 해양법협약이 다루는 네 가지 쟁점은 특히 북극과 관련이 있다. ①얼음으로 덮인 지역(협약 제234조 ice-covered areas), ②국제 해협(협약 제3부 international straits), ③EEZ의 해양 과학 연구 및 환경 보호(협약 제13부 marine scientific research and environmental protection in the EEZ), ④지역협력(협약 제9부 regional cooperation). 북극해 해양지역의 관할권과 관련된 쟁점들을 정리하면 다음과 같다. ①북극해의 해양 경계와 기선(Baselines), ②군도(섬제도, Islands)에 대한 레짐(협약 제121조), ③대륙붕(continental shelf)(협약 제76조)과 대륙붕의 탄화수소 자원(Hydrocarbon resources), ④북극해 통과 해상루트의 항해, ⑤국가의 관할권 너머에 있는 북극해. 북극에는 캐나다와 그 이웃국가들 간의 관리된 2건의 해양경계 분쟁 외에 단 4건의 중요한 관할권 문제만 있다. 첫째는 러시아와 덴마크의 EEZ를 넘어선 대륙붕에 대한 중복된 주장이다. 이 건에는 캐나다가 곧 합류하게 될 것이다. 두 번째는 북방항로의 해협(러시아)과 북서항로의 채널(캐나다)을 통과하는 통항 권리를 둘러싼 “내수(internal waters)”와 “국제해협”의 분쟁이다. 세 번째 분쟁은 스발바르 군도의 EEZ와 대륙붕의 지위 문제다. 네 번째 쟁점은 EEZ를 넘어선 해저에 대한 잠재적인 청구국으로서 아직은 해양법협약의 비당사국인 미국의 지위 문제다. 따라서 몇몇 쟁점에도 불구하고, 북극해의 현재와 미래 평화 유지는 해양의 포괄적인 법적 질서를 제공하는 해양법 협약에 의해 제공될 수 있다.

The problem of supply and transport of sediment from a mountainous catchment is very important in explaining dynamic geomorphology and the hydrological cycle. The discharge of suspended sediment is determined by a morphological system. Human interference to environment is also an important, not negligible factor in sediment production. Moreover, growing concern in recent years for the problems of nonpoint pollution and for the transport of contaminants through terrestrial and aquatic ecosystem,; has highlighted the role of sediment-associated transport in fluvial systems. This study was conducted in forested and quarried catchments in order to clarify the different discharge process and the mechanism of suspended sediment dynamics for each catchment. As a forested catchment, the Yamaguchi River catchment which drains a 3.12 ㎢ area was chosen. On the other hand, the Futagami River basin, which is formed by three subbasins (1.07, 1.59 and 1.78 ㎢), as a quarried catchment was selected. These catchments are situated to the north and east of Mt. Tsukuba, Ibaraki, Japan. The discharge pattern of suspended sediment from the Futagami River basin is more unstable and irregular than that from forested catchment, the Yamaguchi River catchment. Under the similar rainstorm conditions, suspended sediment concentration from quarried catchment during a rainstorm event increases from 43 to 27,310㎎/l. However, in the case of the forested catchment it changes only from nearly zero to 274 ㎎/l. Generally, the supply source of suspended sediment is classified into two areas, the in-channel and non-channel source areas. As a result of field measurements, in the case of the forested catchment the in-channel (channel bed, channel bank and channel margin) is the main source area of suspended sediment. On the other hand, remarkable sediment source area on the quarried catchmen, is the non-channel that is unvegetated ground.