baber/WOPTO huggingface dataset:
Patent KR-20100039885-A (KR)
Title: Solid-state imaging device and method for manufacturing the same
Inventor: SUGAWA SHIGETOSHI
IPC: H04N5/335
Filed: 2008-09-04
Abstract: Almost in the center of the light-receiving surface of an embedded photodiode (31), a floating diffusion (331) is formed and the gate electrode of a transfer transistor (32) is so disposed as to surround it. The impurity concentration (or depth) in the p-type semiconductor region, n-type semiconductor region or p-type well region of the photodiode (31) is so inclined from the periphery toward the center as to form a potential gradient inclined downward from the periphery toward the center when applying a proper bias voltage to a pn junction. Photoelectric charges generated by receiving light are integrated in the center speedily according to the potential gradient. Since a maximum moving distance from the periphery of the photodiode (31) to the floating diffusion (331) is also short, the photoelectric charge can efficiently be collected even when a period for accumulating the photoelectric charges is short. Thus, detection sensitivity is improved by efficiently utilizing the photoelectric charges generated by the photodiode (31).
Patent KR-20100044839-A (KR)
Title: Radio communication device and radio communication method
Inventor: MATSUMOTO ATSUSHI
IPC: H04W28/16
Filed: 2008-08-13
Abstract: Provided is a radio communication device which can prevent interference between SRS and PUCCH when the PUCCH transmission bandwidth fluctuates and suppress degradation of CQI estimation accuracy by the band where no SRS is transmitted. The device includes: an SRS code generation unit (201) which generates an SRS (Sounding Reference Signal) for measuring uplink line data channel quality; an SRS arrangement unit (202) which frequency-multiplexes the SRS on the SR transmission band and arranges it; and an SRS arrangement control unit (208) which controls SRS frequency multiplex so as to be uniform in frequency without modifying the bandwidth of one SRS multiplex unit in accordance with the fluctuation of the reference signal transmission bandwidth according to the SRS arrangement information transmitted from the base station and furthermore controls the transmission interval of the frequency-multiplexed SRS.
Patent KR-20100039432-A (KR)
Title: Wireless handoffs between multiple networks
Inventor: JAIN NIKHIL
IPC: H04L12/28
Filed: 2006-04-20
Abstract: The disclosure is directed to a mobile communication device, and method for handing off a mobile communications device between two networks. A processor in the mobile device may be used to establish a network connection with a server in a first network while supporting a call in a second network. The mobile device may also include a transceiver that receives information from the server relating to the network connection. The processor may use the information, local measurements, or both to determine whether to handoff the call to the first network.
Patent KR-20100047890-A (KR)
Title: Reinforced solid polymer electrolyte composite membrane, membrane electrode assembly for solid polymer fuel cell, and solid polymer fuel cell
Inventor: ISHIKAWA MASAHIKO
IPC: H01M8/02
Filed: 2008-08-08
Abstract: Disclosed is a solid polymer fuel cell improved in operation stability over time. Specifically disclosed is a reinforced solid polymer electrolyte composite membrane for solid polymer fuel cells, which contains two or more polymer electrolyte membranes and one or more sheet-like porous reinforcing members. This reinforced solid polymer electrolyte composite membrane is characterized in that both front and back sides of the composite membrane are composed of the polymer electrolyte membrane, and the pores of the sheet-like porous reinforcing members are substantially filled with the electrolyte of the polymer electrolyte membranes. This reinforced solid polymer electrolyte composite membrane is further characterized in that the sheet-like porous reinforcing members contain a peroxide decomposition catalyst.
Patent KR-20100059925-A (KR)
Title: System and terminal device
Inventor: NOMURA TAKASHI
IPC: H04M1/72457
Filed: 2009-03-25
Abstract: A terminal (104) which allows proper control of the operation mode thereof according to the situation without regard to whether the terminal is operated or not by a user. The terminal (104) comprises a storage device (206) wherein a mode identifier designating a manner mode or a normal mode is stored, a communication device (210), a position acquisition device (208) which acquires the present position, an input device (204) which causes the user to designate the operation mode, and a control part (200) which transmits a mode change instruction including the present position and the mode identifier through the communication device (210) when the operation mode is designated. The terminal (104) moreover comprises a voice output device (214) and a processing part which in response to reception of the mode change instruction from another terminal device, determines whether to store the mode identifier included in the mode change instruction in the storage device (206), depending on the distance between the present position acquired by the position acquisition device (208) and a present position included in the mode change instruction.
Patent KR-20100083132-A (KR)
Title: Device for moving a person of reduced mobility
Inventor: KRAEMER PATRICK
IPC: A61G7/10
Filed: 2008-09-09
Abstract: The invention relates to a device for moving a person of reduced mobility, in particular to move a person between two horizontal supporting structures disposed close to one another. According to the invention, the device includes at least one movement element (1) formed by a horizontally planar base (2) and a supporting element (3). In addition, the invention includes means for moving the base (2) in relation to the supporting element (3), combining guiding means with pulling and gripping means, so that the base (2) can be moved rectilinearly between end positions defined by the front and rear edges of the supporting element (3) when said element is being held stationary under a vertical force. The supporting element (3) is formed by a plate (13) having a lower surface including at least one rectilinear longitudinal rail (14) intended to engage with at least one corresponding groove (15) provided on the upper wall of the base (2).
Patent KR-20100075893-A (KR)
Title: Composition comprising one more hydrophobically modified polyacrylamides and method of using said composition
Inventor: HESSEFORT YIN Z
IPC: C09K23/00
Filed: 2008-09-11
Abstract: This invention pertains to a composition comprising one or more hydrophobically modified polyacrylamides, wherein the polyacrylamides contain acrylamide, one or more anionic monomers, and excludes a cationic monomer, and a method of using the composition for consumer and/or industrial applications.
Patent KR-20100074267-A (KR)
Title: Led backlight for display systems
Inventor: CHEN WEI
IPC: G09G3/36
Filed: 2008-09-10
Abstract: An LED backlight method and apparatus for display systems provides a plurality of light emitting diodes having different white point colors. At least two of the light emitting diodes having different white point colors are selected to produce a light of a predetermined white point color when the light outputs of the selected light emitting diodes are mixed. The selected light emitting diodes are mounted on a display panel in a predetermined order at spatially distributed positions for mixing their light outputs to produce the light of the predetermined white point color to illuminate the display panel with the light of the predetermined white point color.
Patent KR-20100097675-A (KR)
Inventor: DIAMOND IVAN
IPC: A61P25/22
Filed: 2008-11-06
Abstract: 예를 들어, 우울증, 범불안 장애, 사회 공포증, 공황 장애, 및 수면 장애와 같은 정신 장애를 앓고 있는 포유류에서 치료를 위해 사용되는 ALDH-2 억제제로서 유용한, 하기 화학식 (I) 의 구조를 갖는 이소플라본 유도체가 개시된다 : 
 .
Patent KR-20100097144-A (KR)
Title: Highly pure amphiphilic copolymer comprising hydrophobic block from alpha-hydroxy acid and process for the preparation thereof
Inventor: KIM BONG OH
IPC: C08L67/00
Filed: 2008-12-31
Abstract: PURPOSE: A highly pure amphiphilic copolymer and a producing method thereof are provided to effectively remove a non-reactive monomer and an organo-metallic catalyst from the copolymer for obtaining a high purity polymer. CONSTITUTION: A producing method of a highly pure amphiphilic copolymer containing a hydrophobic polymer block of high purity polyalpha-hydroxy acid comprises the following steps: dissolving an amphiphilic copolymer containing the hydrophobic polymer block of the high purity polyalpha-hydroxy acid to an organic solvent with the water miscibility; inserting water or an alkali metallic salt aqueous solution to the polymer solution obtained from the previous step; separating an organic solvent layer and an aqueous solution layer; and collecting the organic solvent layer, and removing the organic solvent to collect the highly pure amphiphilic copolymer.
Patent KR-20100092520-A (KR)
Inventor: FUJIKAWA HIROYUKI
IPC: G03G9/08
Filed: 2008-12-26
Abstract: 결착 수지 및 왁스를 적어도 함유하는 토너 입자와 외첨제를 갖는 토너이며, 주사형 프로브 현미경으로 측정되는 토너 입자 표면의 평균 면 거칠기(Ra)가 1.0nm 이상 30.0nm 이하이며, 모세관 흡인 시간법에 의해 계측되고, 하기 수학식 1로부터 산출되는, 45체적% 메탄올 수용액에 대한 토너의 표면 장력 지수 I가 5.0×10 -3 N/m 이상 1.0×10 -1 N/m 이하인 것을 특징으로 하는 토너에 관한 것이다. 
<수학식 1> 
   
식 중, I: 토너의 표면 장력 지수(N/m), 
P α : 45체적% 메탄올 수용액에 대한 토너의 모관 압력(N/m 2 ), 
A: 토너의 비표면적(m 2 /g), 
B: 토너의 진밀도(g/cm 3 )이다.
Patent KR-20100120155-A (KR)
Title: Method for conditioning radioactive ion exchange resins
Inventor: GASSEN RAINER
IPC: G21F9/30
Filed: 2009-01-15
Abstract: A method for conditioning a contaminated ion exchange resin includes mixing the contaminated ion exchange resin with water and at least partly breaking up the contaminated ion exchange resin into water-soluble components or fragments through the use of an oxidizing agent added to the water. A resulting aqueous solution is consolidated with a binder, optionally after concentration by evaporation of water.
Patent KR-20100115783-A (KR)
Inventor: WANG SONG
IPC: G10L21/0208
Filed: 2009-01-29
Abstract: 사운드 신호 수신은 신호 품질을 동적으로 조정하도록 가중되는 사운드 신호들을 포착하기 위해 복수의 마이크로폰들을 이용함으로써 개선된다.  제 1 사운드 신호 및 제 2 사운드 신호가 제 1 및 제 2 마이크로폰들로부터 각각 획득되며, 여기서 상기 제 1 및 제 2 사운드 신호들은 하나 이상의 사운드 소스들로부터 기원한다.  제 1 신호 특성(예를 들어, 신호 전력, 신호-대-잡음 비 등)은 상기 제 1 사운드 신호에 대해 획득되며 제 2 신호 특성은 제 2 사운드 신호에 대해 획득된다.  상기 제 1 및 제 2 사운드 신호들은 그들 각각의 제 1 및 제 2 신호 특성들에 기초하여 가중되거나 스케일링된다.  상기 가중된 제 1 및 제 2 신호 특성들은 그 후에 출력 사운드 신호를 획득하도록 조합된다.
Patent KR-20110122053-A (KR)
Inventor: GYRN STEFFEN
IPC: A61M5/165
Filed: 2009-02-24
Abstract: 본 발명은 장치 내부의 공간에 접근성을 부여하는 개구부(13)를 완전히 덮어씌우는 멤브레인(17)에 관한 것으로, 이 멤브레인은 바늘로 관통될 수 있는 탄성 재료로 만들어지며, 개구부(13) 둘레에서 체결되고, 개구부(13)에서 돌출해 있으며 개구부(13) 앞에 공기로 채워진 용적부를 형성하고, 공기로 채워진 용적부는 외부에서 압력이 멤브레인(17)에 가해질 때 크기를 축소할 수 있으며, 멤브레인(17)의 내부면은 통로(17a)를 형성하는데, 멤브레인(17)의 제1폐쇄단부는 바늘(19)이 통과할 수 있으며 멤브레인(17)의 제2단부는 고정부(61)에 멤브레인(17)을 부착한다.  멤브레인(17)의 벽은 단단한 재료의 벽을 지지되는 멤브레인(17)의 외부면 없이도 사용위치에서 돌출형상을 유지할 수 있게 선택된 멤브레인 재료에 두께와 형상을 갖는다. 또한, 본 발명은 멤브레인이 사용될 장치와 이 장치가 대응 유닛과 결합하는 키트에 관한 것이다.
Patent KR-20100113627-A (KR)
Inventor: ANDREELLA PAOLO
IPC: A61K31/404
Filed: 2009-02-11
Abstract: 본 발명은 하기 화학식 1의 바제독시펜 아세테이트의 다형체 형태 A의 제조방법 및 그 방법에 의해 제조된 다형체 형태 A에 관한 것이다: 
화학식 1
Patent KR-20110002866-A (KR)
Inventor: SOLIMAN SAMIR S
IPC: H04W64/00
Filed: 2009-04-21
Abstract: 위치 결정 시스템, 장치 및 방법이 개시된다.     조정 디바이스는 위치 결정 처리를 위해 무선 디바이스들의 그룹을 식별한다.     그룹 내의 무선 디바이스들의 수는 시스템 내에서 위치를 정의하는데 사용된 좌표들의 수에 따라 변화될 수도 있다.     조정 디바이스는 그룹 내의 각 쌍의 무선 디바이스들 사이의 거리를 결정할 수 있는 범위 측정값들을 획득한다.     또한, 조정 디바이스는 그룹 내의 하나의 무선 디바이스의 기지의 위치를 획득한다.     이 정보를 이용하여, 위치 데이터가 이용가능하지 않은 그룹 내의 하나 이상의 디바이스들에 대하여 위치가 결정된다.     선택적으로, 위치 데이터는 시스템에서의 조정 디바이스 또는 다른 무선 디바이스에 의해 확인되고 최종 위치는 하나 이상의 무선 디바이스들로 반환된다.
Patent KR-20110011640-A (KR)
Inventor: BUSCHMANN HELMUT HEINRICH
IPC: A61K31/4152
Filed: 2009-04-24
Abstract: 본 발명은 아편유사제 또는 아편제의 진통 효과를 증강시키는 한편, 이와 동시에 이들에 의한 의존성은 감소시키기 위한, 일군의 화학식 (I)의 시그마 수용체 리간드에 관한 것이다.
Patent KR-20110026422-A (KR)
Inventor: GAUDIN CHRISTOPHE
IPC: A61P9/06
Filed: 2009-06-08
Abstract: 본 발명은 영구적 심방 세동의 예방에 사용하기 위한 약제의 제조에 있어서의 드로네다론의 용도에 관한 것이다.
Patent KR-20110040759-A (KR)
Title: Sheet material cutting device
Inventor: PARK HONG SOON
IPC: B23D17/00
Filed: 2009-06-22
Abstract: PURPOSE: A board cutting device is provided to prevent a cut section from being bent since uniform power is uniformly applied on the entire cut section. CONSTITUTION: A board cutting device comprises a pair of rotators(150), a support holder(110), and a cutting member(130). A pair of rotators is separated in opposite directions. A pair of rotators engages with each other and rotates. The support holder passes through the center of a pair of rotators. The board passes through a perforated slit(122) of the support holder. The cutting member is installed outside the support holder. Both ends of the cutting member are supported by a pair of the rotators. The cutting member is rotated with the rotator to cut the board.
Patent KR-20110010799-A (KR)
Inventor: YANO KOKI
IPC: B22F3/12
Filed: 2009-05-22
Abstract: 본 발명은 표면에 화이트스폿이 없는 외관이 양호한 스퍼터링 타겟을 제공한다.  본 발명은 2종 이상의 상동 결정 구조를 포함하는 산화물 소결체로 이루어지는 것을 특징으로 하는 스퍼터링 타겟을 제공한다.
Patent KR-20110020866-A (KR)
Inventor: HIRANO HIDEKAZU
IPC: F16C33/34
Filed: 2009-06-12
Abstract: 정밀하게 성형할 수 있고 또한 장기 수명화를 달성할 수 있는 베어링용 롤러, 및 베어링용 롤러의 가공 방법의 제공과, 회전 토크를 작게 할 수 있고 또한 회전 정밀도의 향상을 달성할 수 있는 베어링을 제공한다. 양단면의 센터 구멍(23, 24)에 지지된 상태에서 외경면(20a) 파지에 의해 그 축심 둘레로 회전시키면서 단면(20b, 20c) 및 R부(21, 22)에 있어서의 단면측 R부(21b, 22b)를 연삭한다. 양단면의 센터 구멍(23, 24)에 지지된 상태에서 적어도 어느 한쪽의 단면(20b, 20c)으로부터의 구동력 전달에 의해 그 축심 둘레로 회전시키면서 외경면(20a) 및 R부(21, 22)에 있어서의 외경면측 코너부(21a, 21b)를 연삭한다.
Patent KR-20120078855-A (KR)
Title: Dental implant fixture
Inventor: PARK KWANG BUM
IPC: A61C8/00
Filed: 2011-01-03
Abstract: PURPOSE: A fixture of dental implant is provided to provide excellent initial anchoring force and minimizing bone stress by reducing the implated time at the same time. CONSTITUTION: A fixture of dental implant comprises a body portion(120) and a screw part(130). The body portion is a part which forms the central stem of the fixture, and a collar having a fixed length is formed in the upper part. The screw part comprises a wide width screw part(131) which is formed along a longitudinal direction of the body portion, and a narrow width single breadth screw part(133) which is formed narrower than the width of the pitch spacing. In the top wide width screw part among the wide width screw part, the lowest single breadth screw part is processed as partially overlapped. The wide width screw part is a square thread, and the narrow width single breadth screw part is a triangular screw thread.
Patent KR-20120080470-A (KR)
Title: Thai language touch screen keypad array for mobile device
Inventor: PARK JIN SUN
IPC: G06F3/041
Filed: 2011-01-07
Abstract: PURPOSE: A touch screen key pad array on a mobile terminal for the Thai language is provided to directly input various Thai characters based on few numbers of keys. CONSTITUTION: A virtual keypad is formed on a screen. Ten fixed character keys(100) displaying fixed characters and six variable character keys(200) are allocated. When one of the fixed character keys is touched, auxiliary characters corresponding to the touched fixed character key are displayed on the variable character keys. When one of the variable character keys is touched, the auxiliary character displayed on the touched variable character key is input on the screen. The fixed character keys are arranged from second column to fourth column. The variable character keys are arranged at the first row to the third row of the first column and the first row to the third row of the fifth column which correspond to both sides of the fixed character keys.
Patent KR-20120085977-A (KR)
Inventor: KIM KYU TAE
IPC: B05B9/04
Filed: 2011-01-25
Abstract: 본 발명은 차량으로부터 전파되는 전염성 질병으로부터 가축을 보호하기 위해 축산농가 출입구 또는 방역을 필요로 하는 도로에 설치되는 차량소독기에 관한것이다. 
-기존의 터널형 또는 붐대형 차량소독기는 겨울철 동파에 취약한 구조이며 실제 가장 철저한 소독이 절실한 겨울철에 사용하지못하고 거의 방치되어 있는 실정이다. 
-기존의 차량소독기는 동파문제를 해결하기 위하여 전기열선이나 고압공기를 이용 또는 잔량회수 방법을 적용했으나 기대만큼 효과적이지 못하거나 그 효과가 지속적이지 못하다. 
-본 발명은 상기의 문제점들을 해결하기 위하여 소독약액 파이프와 온수관을 일체형으로 만들어, 온수관의 열이 약액파이프에 전달되게 함으로써 동파 및 막힘을 예방함은 물론 소독약액의 온도를 적절히 유지하여 방역의 효과를 최대화 시키도록 한것이다. 
-본 발명은 기존의 차량소독기 시스템을 그대로 유지하되 파이프관만을 교체시공함으로써 적은 비용으로 원하는 방역효과를 항구적으로 가져갈 수 있다.
Patent KR-20120086101-A (KR)
Title: Pollution detector for air filter
Inventor: LEE SU HYUN
IPC: F24F13/28
Filed: 2011-01-25
Abstract: PURPOSE: An apparatus for detecting the pollution of an air filter is provided to inform users with the time for cleaning the air filter. CONSTITUTION: An apparatus(100) for detecting the pollution of an air filter comprises an air filter(110), a contaminant detection unit(120), and a controller(130). The air filter is installed in an air conditioner. The air filter removes foreign contaminants flowing into the inside of the air conditioner. The contaminant detection unit is installed in the air conditioner to detect dust in the air filter. The controller indicates errors on a display unit if a signal generated from the contaminant detection unit is less than a predetermined value. The contaminant detection unit comprises a signal generating unit(121) and a signal receiving unit(123). The signal generating unit placed on one side of the air filter sends the signal to the air filter. The signal receiving unit placed on the other side of the air filter receives the signal from the signal generating unit.
Patent KR-20110090828-A (KR)
Title: Nonvolatile semiconductor memory device and driving method thereof
Inventor: KITO MASARU
IPC: G11C16/06
Filed: 2011-02-01
Abstract: PURPOSE: A nonvolatile semiconductor memory device and a driving method thereof are provided to input an n value into a memory region by setting elimination information over a plurality of memory regions. CONSTITUTION: In a nonvolatile semiconductor memory device and a driving method thereof, a nonvolatile semiconductor memory comprises a memory unit and a controller. The memory unit has a charge accumulation layer and a memory cell transistor. The memory cell transistor is formed in the each memory region. A plurality of memory regions accumulates electric charge. The critical value of the memory cell transistor is changed by the setting information of the memory region.
Patent KR-20120091886-A (KR)
Title: Liquid crystal display
Inventor: BYUN HO YUN
IPC: C08G73/10
Filed: 2011-02-10
Abstract: PURPOSE: A liquid crystal display device is provided to prevent a change of a line tilt angle of a liquid crystal molecule. CONSTITUTION: A first substrate faces a second substrate. An alignment film is formed on the first substrate and the second substrate. The alignment film comprises a polymer. The polymer is obtained by copolymerizing a dianhydride monomer or a diamine monomer. A liquid crystal layer(3) is placed between the first substrate and the second substrate.
Patent KR-20120093697-A (KR)
Title: Solar cell street lamp
Inventor: JEON DONG NYEONG
IPC: F21S9/03
Filed: 2011-02-15
Abstract: PURPOSE: A street light charged by solar energy is provided to be charged by sunlight without a separate auxiliary device by forming a pillar portion of the street light with a solar cell. CONSTITUTION: A base portion(110) forms a lower portion of a street light(100) and is fixed to an installation surface. A sunlight charging pillar portion(200) is coupled with the top of the base portion and includes one or more sunlight charging pillar modules into which one or more solar panels are slidingly inserted. A lamp portion(120) is coupled with the top of the sunlight charging pillar portion and emits light using power which is provided from the sunlight charging pillar modules.
Patent KR-20120094208-A (KR)
Title: A semiconductor device and method of fabricating the same
Inventor: HYUN CHAN SUN
IPC: H01L21/28
Filed: 2011-02-16
Abstract: PURPOSE: A semiconductor device and a manufacturing method thereof are provided to improve contact resistance of a contact plug by forming a spacer on the upper sidewall of the contact plug. CONSTITUTION: A first interlayer insulating film(107) is formed on the upper surface of a bottom structure. A contact hole is formed by passing through the first interlayer insulating film. A contact plug(120) is formed inside the contact hole. A recess is formed at both sides of an opening of the contact hole. An etch stopping layer(121) and a second interlayer insulating film(123) are successively formed on the upper surface of an entire structure. A metal line is connected to the contact plug by passing through the etch stopping layer and the second interlayer insulating film.
Patent KR-20110096498-A (KR)
Inventor: WU CHIH HSIANG
IPC: H04W4/00
Filed: 2011-02-21
Abstract: 여기에 소개된 기술들은 inter-RAT 핸드오버가 SRVCC 핸드오버인지를 결정하고, 후속의 SRVCC 핸드오버를 수행하는 시스템 및 방법을 제공한다.  상기 기술들은 SRVCC 관련 정보 요소, 예를 들어 "대체될 RAB 정보(RAB info to replace)" 정보 요소를 포함하지 않는 핸드오버 커맨드 메시지를 수신하는 단계, 및 설치용 정보에 제공된 회선교환 RAB를 사용해서 SRVCC 핸드오버를 계속하는 단계를 포함한다.  이러한 기술들은 또한 SRVCC 관련 정보 요소를 포함하는 핸드오버 커맨드 메시지를 수신하는 단계 및 대안의 방법으로 SRVCC 핸드오버를 수행하는 단계를 포함한다.
Patent KR-20120096276-A (KR)
Title: System and method for self-organization of wireless sensor networks
Inventor: LEE YONG HWAN
IPC: H04L45/02
Filed: 2011-02-22
Abstract: PURPOSE: A self-configuration system and a self-configuration method of a wireless sensor network using the same are provided to estimate the number of devices within the minimum network depth and communication coverage radius and optimize multiple trees according to a real device installation environment. CONSTITUTION: A parent device(200) selects subscribed children. The parent device allocates an address to a child device. The child device selects the child device of a high priority tree step. The children devices request subscription. The child device is subscribed to the parent device according to the selection of the parent device. The child device allocates an address.
Patent KR-20120100207-A (KR)
Title: A method for differentiation and expansion of nk cell from cd14 positive monocytes
Inventor: CHOI IN PYO
IPC: A61K35/51
Filed: 2011-03-03
Abstract: PURPOSE: A differentiation and a propagation method of natural killer cells from umbilical cord blood CD14 positive monocytes are provided to induce NK cells from the CD14 positive cells, thereby obtaining high purity NK cells in a short time. CONSTITUTION: A differentiation method of natural killer cells from umbilical cord blood CD14 positive monocytes includes a step of mixing the umbilical cord blood CD14 positive monocytes with IL-15 and IL-21. A propagation method of natural killer cells from the umbilical cord blood CD14 positive monocyte includes a step of mixing the umbilical cord blood CD14 positive monocyte with IL-15 and IL-21. The CD14 positive monocyte is manufactured by the following steps: manufacturing CD3-CD34-CD56-CD19 cells by eliminating CD3, CD34, CD56 and CD19 positive cells from the umbilical cord blood originated monocyte; and manufacturing CD3-CD34-CD56-CD19-CD14+ cells by eliminating CD14 negative cells the CD3-CD34-CD56-CD19- cells. A pharmaceutical composition for preventing and treating cancer includes the natural killer cell as an active ingredient. The cancer is breast cancer, melanoma cancer, stomach cancer, liver cancer, colon cancer or lung cancer.